community.general/plugins/module_utils/redfish_utils.py

# -*- coding: utf-8 -*-
# Copyright (c) 2017-2018 Dell EMC Inc.
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import absolute_import, division, print_function
__metaclass__ = type

import json
import os
import random
import string
import gzip
import time
from io import BytesIO
from ansible.module_utils.urls import open_url
from ansible.module_utils.common.text.converters import to_native
from ansible.module_utils.common.text.converters import to_text
from ansible.module_utils.common.text.converters import to_bytes
from ansible.module_utils.six import text_type
from ansible.module_utils.six.moves import http_client
from ansible.module_utils.six.moves.urllib.error import URLError, HTTPError
from ansible.module_utils.six.moves.urllib.parse import urlparse
from ansible.module_utils.ansible_release import __version__ as ansible_version
from ansible_collections.community.general.plugins.module_utils.version import LooseVersion

GET_HEADERS = {'accept': 'application/json', 'OData-Version': '4.0'}
POST_HEADERS = {'content-type': 'application/json', 'accept': 'application/json',
                'OData-Version': '4.0'}
PATCH_HEADERS = {'content-type': 'application/json', 'accept': 'application/json',
                 'OData-Version': '4.0'}
PUT_HEADERS = {'content-type': 'application/json', 'accept': 'application/json',
               'OData-Version': '4.0'}
DELETE_HEADERS = {'accept': 'application/json', 'OData-Version': '4.0'}

FAIL_MSG = 'Issuing a data modification command without specifying the '\
           'ID of the target %(resource)s resource when there is more '\
           'than one %(resource)s is no longer allowed. Use the `resource_id` '\
           'option to specify the target %(resource)s ID.'


class RedfishUtils(object):

    def __init__(self, creds, root_uri, timeout, module, resource_id=None,
                 data_modification=False, strip_etag_quotes=False, ciphers=None):
        self.root_uri = root_uri
        self.creds = creds
        self.timeout = timeout
        self.module = module
        self.service_root = '/redfish/v1/'
        self.session_service_uri = '/redfish/v1/SessionService'
        self.sessions_uri = '/redfish/v1/SessionService/Sessions'
        self.resource_id = resource_id
        self.data_modification = data_modification
        self.strip_etag_quotes = strip_etag_quotes
        self.ciphers = ciphers
        self._vendor = None
        self._init_session()

    def _auth_params(self, headers):
        """
        Return tuple of required authentication params based on the presence
        of a token in the self.creds dict. If using a token, set the
        X-Auth-Token header in the `headers` param.

        :param headers: dict containing headers to send in request
        :return: tuple of username, password and force_basic_auth
        """
        if self.creds.get('token'):
            username = None
            password = None
            force_basic_auth = False
            headers['X-Auth-Token'] = self.creds['token']
        else:
            username = self.creds['user']
            password = self.creds['pswd']
            force_basic_auth = True
        return username, password, force_basic_auth

    def _check_request_payload(self, req_pyld, cur_pyld, uri):
        """
        Checks the request payload with the values currently held by the
        service. Will check if changes are needed and if properties are
        supported by the service.

        :param req_pyld: dict containing the properties to apply
        :param cur_pyld: dict containing the properties currently set
        :param uri: string containing the URI being modified
        :return: dict containing response information
        """

        change_required = False
        for prop in req_pyld:
            # Check if the property is supported by the service
            if prop not in cur_pyld:
                return {'ret': False,
                        'changed': False,
                        'msg': '%s does not support the property %s' % (uri, prop),
                        'changes_required': False}

            # Perform additional checks based on the type of property
            if isinstance(req_pyld[prop], dict) and isinstance(cur_pyld[prop], dict):
                # If the property is a dictionary, check the nested properties
                sub_resp = self._check_request_payload(req_pyld[prop], cur_pyld[prop], uri)
                if not sub_resp['ret']:
                    # Unsupported property or other error condition; no change
                    return sub_resp
                if sub_resp['changes_required']:
                    # Subordinate dictionary requires changes
                    change_required = True

            else:
                # For other properties, just compare the values

                # Note: This is also a fallthrough for cases where the request
                # payload and current settings do not match in their data type.
                # There are cases where this can be expected, such as when a
                # property is always 'null' in responses, so we want to attempt
                # the PATCH request.

                # Note: This is also a fallthrough for properties that are
                # arrays of objects.  Some services erroneously omit properties
                # within arrays of objects when not configured, and it's
                # expecting the client to provide them anyway.

                if req_pyld[prop] != cur_pyld[prop]:
                    change_required = True

        resp = {'ret': True, 'changes_required': change_required}
        if not change_required:
            # No changes required; all properties set
            resp['changed'] = False
            resp['msg'] = 'Properties in %s are already set' % uri
        return resp

    # The following functions are to send GET/POST/PATCH/DELETE requests
    def get_request(self, uri, override_headers=None, allow_no_resp=False, timeout=None):
        req_headers = dict(GET_HEADERS)
        if override_headers:
            req_headers.update(override_headers)
        username, password, basic_auth = self._auth_params(req_headers)
        if timeout is None:
            timeout = self.timeout
        try:
            # Service root is an unauthenticated resource; remove credentials
            # in case the caller will be using sessions later.
            if uri == (self.root_uri + self.service_root):
                basic_auth = False
            resp = open_url(uri, method="GET", headers=req_headers,
                            url_username=username, url_password=password,
                            force_basic_auth=basic_auth, validate_certs=False,
                            follow_redirects='all',
                            use_proxy=True, timeout=timeout, ciphers=self.ciphers)
            headers = {k.lower(): v for (k, v) in resp.info().items()}
            try:
                if headers.get('content-encoding') == 'gzip' and LooseVersion(ansible_version) < LooseVersion('2.14'):
                    # Older versions of Ansible do not automatically decompress the data
                    # Starting in 2.14, open_url will decompress the response data by default
                    data = json.loads(to_native(gzip.open(BytesIO(resp.read()), 'rt', encoding='utf-8').read()))
                else:
                    data = json.loads(to_native(resp.read()))
            except Exception as e:
                # No response data; this is okay in certain cases
                data = None
                if not allow_no_resp:
                    raise
        except HTTPError as e:
            msg = self._get_extended_message(e)
            return {'ret': False,
                    'msg': "HTTP Error %s on GET request to '%s', extended message: '%s'"
                           % (e.code, uri, msg),
                    'status': e.code}
        except URLError as e:
            return {'ret': False, 'msg': "URL Error on GET request to '%s': '%s'"
                                         % (uri, e.reason)}
        # Almost all errors should be caught above, but just in case
        except Exception as e:
            return {'ret': False,
                    'msg': "Failed GET request to '%s': '%s'" % (uri, to_text(e))}
        return {'ret': True, 'data': data, 'headers': headers, 'resp': resp}

    def post_request(self, uri, pyld, multipart=False):
        req_headers = dict(POST_HEADERS)
        username, password, basic_auth = self._auth_params(req_headers)
        try:
            # When performing a POST to the session collection, credentials are
            # provided in the request body.  Do not provide the basic auth
            # header since this can cause conflicts with some services
            if self.sessions_uri is not None and uri == (self.root_uri + self.sessions_uri):
                basic_auth = False
            if multipart:
                # Multipart requests require special handling to encode the request body
                multipart_encoder = self._prepare_multipart(pyld)
                data = multipart_encoder[0]
                req_headers['content-type'] = multipart_encoder[1]
            else:
                data = json.dumps(pyld)
            resp = open_url(uri, data=data,
                            headers=req_headers, method="POST",
                            url_username=username, url_password=password,
                            force_basic_auth=basic_auth, validate_certs=False,
                            follow_redirects='all',
                            use_proxy=True, timeout=self.timeout, ciphers=self.ciphers)
            try:
                data = json.loads(to_native(resp.read()))
            except Exception as e:
                # No response data; this is okay in many cases
                data = None
            headers = {k.lower(): v for (k, v) in resp.info().items()}
        except HTTPError as e:
            msg = self._get_extended_message(e)
            return {'ret': False,
                    'msg': "HTTP Error %s on POST request to '%s', extended message: '%s'"
                           % (e.code, uri, msg),
                    'status': e.code}
        except URLError as e:
            return {'ret': False, 'msg': "URL Error on POST request to '%s': '%s'"
                                         % (uri, e.reason)}
        # Almost all errors should be caught above, but just in case
        except Exception as e:
            return {'ret': False,
                    'msg': "Failed POST request to '%s': '%s'" % (uri, to_text(e))}
        return {'ret': True, 'data': data, 'headers': headers, 'resp': resp}

    def patch_request(self, uri, pyld, check_pyld=False):
        req_headers = dict(PATCH_HEADERS)
        r = self.get_request(uri)
        if r['ret']:
            # Get etag from etag header or @odata.etag property
            etag = r['headers'].get('etag')
            if not etag:
                etag = r['data'].get('@odata.etag')
            if etag:
                if self.strip_etag_quotes:
                    etag = etag.strip('"')
                req_headers['If-Match'] = etag

        if check_pyld:
            # Check the payload with the current settings to see if changes
            # are needed or if there are unsupported properties
            if r['ret']:
                check_resp = self._check_request_payload(pyld, r['data'], uri)
                if not check_resp.pop('changes_required'):
                    check_resp['changed'] = False
                    return check_resp
            else:
                r['changed'] = False
                return r

        username, password, basic_auth = self._auth_params(req_headers)
        try:
            resp = open_url(uri, data=json.dumps(pyld),
                            headers=req_headers, method="PATCH",
                            url_username=username, url_password=password,
                            force_basic_auth=basic_auth, validate_certs=False,
                            follow_redirects='all',
                            use_proxy=True, timeout=self.timeout, ciphers=self.ciphers)
        except HTTPError as e:
            msg = self._get_extended_message(e)
            return {'ret': False, 'changed': False,
                    'msg': "HTTP Error %s on PATCH request to '%s', extended message: '%s'"
                           % (e.code, uri, msg),
                    'status': e.code}
        except URLError as e:
            return {'ret': False, 'changed': False,
                    'msg': "URL Error on PATCH request to '%s': '%s'" % (uri, e.reason)}
        # Almost all errors should be caught above, but just in case
        except Exception as e:
            return {'ret': False, 'changed': False,
                    'msg': "Failed PATCH request to '%s': '%s'" % (uri, to_text(e))}
        return {'ret': True, 'changed': True, 'resp': resp, 'msg': 'Modified %s' % uri}

    def put_request(self, uri, pyld):
        req_headers = dict(PUT_HEADERS)
        r = self.get_request(uri)
        if r['ret']:
            # Get etag from etag header or @odata.etag property
            etag = r['headers'].get('etag')
            if not etag:
                etag = r['data'].get('@odata.etag')
            if etag:
                if self.strip_etag_quotes:
                    etag = etag.strip('"')
                req_headers['If-Match'] = etag
        username, password, basic_auth = self._auth_params(req_headers)
        try:
            resp = open_url(uri, data=json.dumps(pyld),
                            headers=req_headers, method="PUT",
                            url_username=username, url_password=password,
                            force_basic_auth=basic_auth, validate_certs=False,
                            follow_redirects='all',
                            use_proxy=True, timeout=self.timeout, ciphers=self.ciphers)
        except HTTPError as e:
            msg = self._get_extended_message(e)
            return {'ret': False,
                    'msg': "HTTP Error %s on PUT request to '%s', extended message: '%s'"
                           % (e.code, uri, msg),
                    'status': e.code}
        except URLError as e:
            return {'ret': False, 'msg': "URL Error on PUT request to '%s': '%s'"
                                         % (uri, e.reason)}
        # Almost all errors should be caught above, but just in case
        except Exception as e:
            return {'ret': False,
                    'msg': "Failed PUT request to '%s': '%s'" % (uri, to_text(e))}
        return {'ret': True, 'resp': resp}

    def delete_request(self, uri, pyld=None):
        req_headers = dict(DELETE_HEADERS)
        username, password, basic_auth = self._auth_params(req_headers)
        try:
            data = json.dumps(pyld) if pyld else None
            resp = open_url(uri, data=data,
                            headers=req_headers, method="DELETE",
                            url_username=username, url_password=password,
                            force_basic_auth=basic_auth, validate_certs=False,
                            follow_redirects='all',
                            use_proxy=True, timeout=self.timeout, ciphers=self.ciphers)
        except HTTPError as e:
            msg = self._get_extended_message(e)
            return {'ret': False,
                    'msg': "HTTP Error %s on DELETE request to '%s', extended message: '%s'"
                           % (e.code, uri, msg),
                    'status': e.code}
        except URLError as e:
            return {'ret': False, 'msg': "URL Error on DELETE request to '%s': '%s'"
                                         % (uri, e.reason)}
        # Almost all errors should be caught above, but just in case
        except Exception as e:
            return {'ret': False,
                    'msg': "Failed DELETE request to '%s': '%s'" % (uri, to_text(e))}
        return {'ret': True, 'resp': resp}

    @staticmethod
    def _prepare_multipart(fields):
        """Prepares a multipart body based on a set of fields provided.

        Ideally it would have been good to use the existing 'prepare_multipart'
        found in ansible.module_utils.urls, but it takes files and encodes them
        as Base64 strings, which is not expected by Redfish services.  It also
        adds escaping of certain bytes in the payload, such as inserting '\r'
        any time it finds a standalone '\n', which corrupts the image payload
        send to the service.  This implementation is simplified to Redfish's
        usage and doesn't necessarily represent an exhaustive method of
        building multipart requests.
        """

        def write_buffer(body, line):
            # Adds to the multipart body based on the provided data type
            # At this time there is only support for strings, dictionaries, and bytes (default)
            if isinstance(line, text_type):
                body.append(to_bytes(line, encoding='utf-8'))
            elif isinstance(line, dict):
                body.append(to_bytes(json.dumps(line), encoding='utf-8'))
            else:
                body.append(line)
            return

        # Generate a random boundary marker; may need to consider probing the
        # payload for potential conflicts in the future
        boundary = ''.join(random.choice(string.digits + string.ascii_letters) for i in range(30))
        body = []
        for form in fields:
            # Fill in the form details
            write_buffer(body, '--' + boundary)

            # Insert the headers (Content-Disposition and Content-Type)
            if 'filename' in fields[form]:
                name = os.path.basename(fields[form]['filename']).replace('"', '\\"')
                write_buffer(body, u'Content-Disposition: form-data; name="%s"; filename="%s"' % (to_text(form), to_text(name)))
            else:
                write_buffer(body, 'Content-Disposition: form-data; name="%s"' % form)
            write_buffer(body, 'Content-Type: %s' % fields[form]['mime_type'])
            write_buffer(body, '')

            # Insert the payload; read from the file if not given by the caller
            if 'content' not in fields[form]:
                with open(to_bytes(fields[form]['filename'], errors='surrogate_or_strict'), 'rb') as f:
                    fields[form]['content'] = f.read()
            write_buffer(body, fields[form]['content'])

        # Finalize the entire request
        write_buffer(body, '--' + boundary + '--')
        write_buffer(body, '')
        return (b'\r\n'.join(body), 'multipart/form-data; boundary=' + boundary)

    @staticmethod
    def _get_extended_message(error):
        """
        Get Redfish ExtendedInfo message from response payload if present
        :param error: an HTTPError exception
        :type error: HTTPError
        :return: the ExtendedInfo message if present, else standard HTTP error
        """
        msg = http_client.responses.get(error.code, '')
        if error.code >= 400:
            try:
                body = error.read().decode('utf-8')
                data = json.loads(body)
                ext_info = data['error']['@Message.ExtendedInfo']
                # if the ExtendedInfo contains a user friendly message send it
                # otherwise try to send the entire contents of ExtendedInfo
                try:
                    msg = ext_info[0]['Message']
                except Exception:
                    msg = str(data['error']['@Message.ExtendedInfo'])
            except Exception:
                pass
        return msg

    def _init_session(self):
        pass

    def _get_vendor(self):
        # If we got the vendor info once, don't get it again
        if self._vendor is not None:
            return {'ret': 'True', 'Vendor': self._vendor}

        # Find the vendor info from the service root
        response = self.get_request(self.root_uri + self.service_root)
        if response['ret'] is False:
            return {'ret': False, 'Vendor': ''}
        data = response['data']

        if 'Vendor' in data:
            # Extract the vendor string from the Vendor property
            self._vendor = data["Vendor"]
            return {'ret': True, 'Vendor': data["Vendor"]}
        elif 'Oem' in data and len(data['Oem']) > 0:
            # Determine the vendor from the OEM object if needed
            vendor = list(data['Oem'].keys())[0]
            if vendor == 'Hpe' or vendor == 'Hp':
                # HPE uses Pascal-casing for their OEM object
                # Older systems reported 'Hp' (pre-split)
                vendor = 'HPE'
            self._vendor = vendor
            return {'ret': True, 'Vendor': vendor}
        else:
            # Could not determine; use an empty string
            self._vendor = ''
            return {'ret': True, 'Vendor': ''}

    def _find_accountservice_resource(self):
        response = self.get_request(self.root_uri + self.service_root)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'AccountService' not in data:
            return {'ret': False, 'msg': "AccountService resource not found"}
        else:
            account_service = data["AccountService"]["@odata.id"]
            response = self.get_request(self.root_uri + account_service)
            if response['ret'] is False:
                return response
            data = response['data']
            accounts = data['Accounts']['@odata.id']
            if accounts[-1:] == '/':
                accounts = accounts[:-1]
            self.accounts_uri = accounts
        return {'ret': True}

    def _find_sessionservice_resource(self):
        # Get the service root
        response = self.get_request(self.root_uri + self.service_root)
        if response['ret'] is False:
            return response
        data = response['data']

        # Check for the session service and session collection.  Well-known
        # defaults are provided in the constructor, but services that predate
        # Redfish 1.6.0 might contain different values.
        self.session_service_uri = data.get('SessionService', {}).get('@odata.id')
        self.sessions_uri = data.get('Links', {}).get('Sessions', {}).get('@odata.id')

        # If one isn't found, return an error
        if self.session_service_uri is None:
            return {'ret': False, 'msg': "SessionService resource not found"}
        if self.sessions_uri is None:
            return {'ret': False, 'msg': "SessionCollection resource not found"}
        return {'ret': True}

    def _get_resource_uri_by_id(self, uris, id_prop):
        for uri in uris:
            response = self.get_request(self.root_uri + uri)
            if response['ret'] is False:
                continue
            data = response['data']
            if id_prop == data.get('Id'):
                return uri
        return None

    def _find_systems_resource(self):
        response = self.get_request(self.root_uri + self.service_root)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'Systems' not in data:
            return {'ret': False, 'msg': "Systems resource not found"}
        response = self.get_request(self.root_uri + data['Systems']['@odata.id'])
        if response['ret'] is False:
            return response
        self.systems_uris = [
            i['@odata.id'] for i in response['data'].get('Members', [])]
        if not self.systems_uris:
            return {
                'ret': False,
                'msg': "ComputerSystem's Members array is either empty or missing"}
        self.systems_uri = self.systems_uris[0]
        if self.data_modification:
            if self.resource_id:
                self.systems_uri = self._get_resource_uri_by_id(self.systems_uris,
                                                                self.resource_id)
                if not self.systems_uri:
                    return {
                        'ret': False,
                        'msg': "System resource %s not found" % self.resource_id}
            elif len(self.systems_uris) > 1:
                self.module.fail_json(msg=FAIL_MSG % {'resource': 'System'})
        return {'ret': True}

    def _find_updateservice_resource(self):
        response = self.get_request(self.root_uri + self.service_root)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'UpdateService' not in data:
            return {'ret': False, 'msg': "UpdateService resource not found"}
        else:
            update = data["UpdateService"]["@odata.id"]
            self.update_uri = update
            response = self.get_request(self.root_uri + update)
            if response['ret'] is False:
                return response
            data = response['data']
            self.firmware_uri = self.software_uri = None
            if 'FirmwareInventory' in data:
                self.firmware_uri = data['FirmwareInventory'][u'@odata.id']
            if 'SoftwareInventory' in data:
                self.software_uri = data['SoftwareInventory'][u'@odata.id']
            return {'ret': True}

    def _find_chassis_resource(self):
        response = self.get_request(self.root_uri + self.service_root)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'Chassis' not in data:
            return {'ret': False, 'msg': "Chassis resource not found"}
        chassis = data["Chassis"]["@odata.id"]
        response = self.get_request(self.root_uri + chassis)
        if response['ret'] is False:
            return response
        self.chassis_uris = [
            i['@odata.id'] for i in response['data'].get('Members', [])]
        if not self.chassis_uris:
            return {'ret': False,
                    'msg': "Chassis Members array is either empty or missing"}
        self.chassis_uri = self.chassis_uris[0]
        if self.data_modification:
            if self.resource_id:
                self.chassis_uri = self._get_resource_uri_by_id(self.chassis_uris,
                                                                self.resource_id)
                if not self.chassis_uri:
                    return {
                        'ret': False,
                        'msg': "Chassis resource %s not found" % self.resource_id}
            elif len(self.chassis_uris) > 1:
                self.module.fail_json(msg=FAIL_MSG % {'resource': 'Chassis'})
        return {'ret': True}

    def _find_managers_resource(self):
        response = self.get_request(self.root_uri + self.service_root)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'Managers' not in data:
            return {'ret': False, 'msg': "Manager resource not found"}
        manager = data["Managers"]["@odata.id"]
        response = self.get_request(self.root_uri + manager)
        if response['ret'] is False:
            return response
        self.manager_uris = [
            i['@odata.id'] for i in response['data'].get('Members', [])]
        if not self.manager_uris:
            return {'ret': False,
                    'msg': "Managers Members array is either empty or missing"}
        self.manager_uri = self.manager_uris[0]
        if self.data_modification:
            if self.resource_id:
                self.manager_uri = self._get_resource_uri_by_id(self.manager_uris,
                                                                self.resource_id)
                if not self.manager_uri:
                    return {
                        'ret': False,
                        'msg': "Manager resource %s not found" % self.resource_id}
            elif len(self.manager_uris) > 1:
                self.module.fail_json(msg=FAIL_MSG % {'resource': 'Manager'})
        return {'ret': True}

    def _get_all_action_info_values(self, action):
        """Retrieve all parameter values for an Action from ActionInfo.
        Fall back to AllowableValue annotations if no ActionInfo found.
        Return the result in an ActionInfo-like dictionary, keyed
        by the name of the parameter. """
        ai = {}
        if '@Redfish.ActionInfo' in action:
            ai_uri = action['@Redfish.ActionInfo']
            response = self.get_request(self.root_uri + ai_uri)
            if response['ret'] is True:
                data = response['data']
                if 'Parameters' in data:
                    params = data['Parameters']
                    ai = {p['Name']: p for p in params if 'Name' in p}
        if not ai:
            ai = {
                k[:-24]: {'AllowableValues': v}
                for k, v in action.items()
                if k.endswith('@Redfish.AllowableValues')
            }
        return ai

    def _get_allowable_values(self, action, name, default_values=None):
        if default_values is None:
            default_values = []
        ai = self._get_all_action_info_values(action)
        allowable_values = ai.get(name, {}).get('AllowableValues')
        # fallback to default values
        if allowable_values is None:
            allowable_values = default_values
        return allowable_values

    def check_service_availability(self):
        """
        Checks if the service is accessible.

        :return: dict containing the status of the service
        """

        # Get the service root
        # Override the timeout since the service root is expected to be readily
        # available.
        service_root = self.get_request(self.root_uri + self.service_root, timeout=10)
        if service_root['ret'] is False:
            # Failed, either due to a timeout or HTTP error; not available
            return {'ret': True, 'available': False}

        # Successfully accessed the service root; available
        return {'ret': True, 'available': True}

    def get_logs(self):
        log_svcs_uri_list = []
        list_of_logs = []
        properties = ['Severity', 'Created', 'EntryType', 'OemRecordFormat',
                      'Message', 'MessageId', 'MessageArgs']

        # Find LogService
        response = self.get_request(self.root_uri + self.manager_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'LogServices' not in data:
            return {'ret': False, 'msg': "LogServices resource not found"}

        # Find all entries in LogServices
        logs_uri = data["LogServices"]["@odata.id"]
        response = self.get_request(self.root_uri + logs_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        for log_svcs_entry in data.get('Members', []):
            response = self.get_request(self.root_uri + log_svcs_entry[u'@odata.id'])
            if response['ret'] is False:
                return response
            _data = response['data']
            if 'Entries' in _data:
                log_svcs_uri_list.append(_data['Entries'][u'@odata.id'])

        # For each entry in LogServices, get log name and all log entries
        for log_svcs_uri in log_svcs_uri_list:
            logs = {}
            list_of_log_entries = []
            response = self.get_request(self.root_uri + log_svcs_uri)
            if response['ret'] is False:
                return response
            data = response['data']
            logs['Description'] = data.get('Description',
                                           'Collection of log entries')
            # Get all log entries for each type of log found
            for logEntry in data.get('Members', []):
                entry = {}
                for prop in properties:
                    if prop in logEntry:
                        entry[prop] = logEntry.get(prop)
                if entry:
                    list_of_log_entries.append(entry)
            log_name = log_svcs_uri.split('/')[-1]
            logs[log_name] = list_of_log_entries
            list_of_logs.append(logs)

        # list_of_logs[logs{list_of_log_entries[entry{}]}]
        return {'ret': True, 'entries': list_of_logs}

    def clear_logs(self):
        # Find LogService
        response = self.get_request(self.root_uri + self.manager_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'LogServices' not in data:
            return {'ret': False, 'msg': "LogServices resource not found"}

        # Find all entries in LogServices
        logs_uri = data["LogServices"]["@odata.id"]
        response = self.get_request(self.root_uri + logs_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        for log_svcs_entry in data[u'Members']:
            response = self.get_request(self.root_uri + log_svcs_entry["@odata.id"])
            if response['ret'] is False:
                return response
            _data = response['data']
            # Check to make sure option is available, otherwise error is ugly
            if "Actions" in _data:
                if "#LogService.ClearLog" in _data[u"Actions"]:
                    self.post_request(self.root_uri + _data[u"Actions"]["#LogService.ClearLog"]["target"], {})
                    if response['ret'] is False:
                        return response
        return {'ret': True}

    def aggregate(self, func, uri_list, uri_name):
        ret = True
        entries = []
        for uri in uri_list:
            inventory = func(uri)
            ret = inventory.pop('ret') and ret
            if 'entries' in inventory:
                entries.append(({uri_name: uri},
                                inventory['entries']))
        return dict(ret=ret, entries=entries)

    def aggregate_chassis(self, func):
        return self.aggregate(func, self.chassis_uris, 'chassis_uri')

    def aggregate_managers(self, func):
        return self.aggregate(func, self.manager_uris, 'manager_uri')

    def aggregate_systems(self, func):
        return self.aggregate(func, self.systems_uris, 'system_uri')

    def get_storage_controller_inventory(self, systems_uri):
        result = {}
        controller_list = []
        controller_results = []
        # Get these entries, but does not fail if not found
        properties = ['CacheSummary', 'FirmwareVersion', 'Identifiers',
                      'Location', 'Manufacturer', 'Model', 'Name', 'Id',
                      'PartNumber', 'SerialNumber', 'SpeedGbps', 'Status']
        key = "Controllers"
        deprecated_key = "StorageControllers"

        # Find Storage service
        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        if 'Storage' not in data:
            return {'ret': False, 'msg': "Storage resource not found"}

        # Get a list of all storage controllers and build respective URIs
        storage_uri = data['Storage']["@odata.id"]
        response = self.get_request(self.root_uri + storage_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        # Loop through Members and their StorageControllers
        # and gather properties from each StorageController
        if data[u'Members']:
            for storage_member in data[u'Members']:
                storage_member_uri = storage_member[u'@odata.id']
                response = self.get_request(self.root_uri + storage_member_uri)
                data = response['data']

                if key in data:
                    controllers_uri = data[key][u'@odata.id']

                    response = self.get_request(self.root_uri + controllers_uri)
                    if response['ret'] is False:
                        return response
                    result['ret'] = True
                    data = response['data']

                    if data[u'Members']:
                        for controller_member in data[u'Members']:
                            controller_member_uri = controller_member[u'@odata.id']
                            response = self.get_request(self.root_uri + controller_member_uri)
                            if response['ret'] is False:
                                return response
                            result['ret'] = True
                            data = response['data']

                            controller_result = {}
                            for property in properties:
                                if property in data:
                                    controller_result[property] = data[property]
                            controller_results.append(controller_result)
                elif deprecated_key in data:
                    controller_list = data[deprecated_key]
                    for controller in controller_list:
                        controller_result = {}
                        for property in properties:
                            if property in controller:
                                controller_result[property] = controller[property]
                        controller_results.append(controller_result)
                result['entries'] = controller_results
            return result
        else:
            return {'ret': False, 'msg': "Storage resource not found"}

    def get_multi_storage_controller_inventory(self):
        return self.aggregate_systems(self.get_storage_controller_inventory)

    def get_disk_inventory(self, systems_uri):
        result = {'entries': []}
        controller_list = []
        # Get these entries, but does not fail if not found
        properties = ['BlockSizeBytes', 'CapableSpeedGbs', 'CapacityBytes',
                      'EncryptionAbility', 'EncryptionStatus',
                      'FailurePredicted', 'HotspareType', 'Id', 'Identifiers',
                      'Links', 'Manufacturer', 'MediaType', 'Model', 'Name',
                      'PartNumber', 'PhysicalLocation', 'Protocol', 'Revision',
                      'RotationSpeedRPM', 'SerialNumber', 'Status']

        # Find Storage service
        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        if 'SimpleStorage' not in data and 'Storage' not in data:
            return {'ret': False, 'msg': "SimpleStorage and Storage resource \
                     not found"}

        if 'Storage' in data:
            # Get a list of all storage controllers and build respective URIs
            storage_uri = data[u'Storage'][u'@odata.id']
            response = self.get_request(self.root_uri + storage_uri)
            if response['ret'] is False:
                return response
            result['ret'] = True
            data = response['data']

            if data[u'Members']:
                for controller in data[u'Members']:
                    controller_list.append(controller[u'@odata.id'])
                for c in controller_list:
                    uri = self.root_uri + c
                    response = self.get_request(uri)
                    if response['ret'] is False:
                        return response
                    data = response['data']
                    controller_name = 'Controller 1'
                    if 'Controllers' in data:
                        controllers_uri = data['Controllers'][u'@odata.id']

                        response = self.get_request(self.root_uri + controllers_uri)
                        if response['ret'] is False:
                            return response
                        result['ret'] = True
                        cdata = response['data']

                        if cdata[u'Members']:
                            controller_member_uri = cdata[u'Members'][0][u'@odata.id']

                            response = self.get_request(self.root_uri + controller_member_uri)
                            if response['ret'] is False:
                                return response
                            result['ret'] = True
                            cdata = response['data']
                            controller_name = cdata['Name']
                    elif 'StorageControllers' in data:
                        sc = data['StorageControllers']
                        if sc:
                            if 'Name' in sc[0]:
                                controller_name = sc[0]['Name']
                            else:
                                sc_id = sc[0].get('Id', '1')
                                controller_name = 'Controller %s' % sc_id
                    drive_results = []
                    if 'Drives' in data:
                        for device in data[u'Drives']:
                            disk_uri = self.root_uri + device[u'@odata.id']
                            response = self.get_request(disk_uri)
                            data = response['data']

                            drive_result = {}
                            for property in properties:
                                if property in data:
                                    if data[property] is not None:
                                        if property == "Links":
                                            if "Volumes" in data["Links"].keys():
                                                volumes = [v["@odata.id"] for v in data["Links"]["Volumes"]]
                                                drive_result["Volumes"] = volumes
                                        else:
                                            drive_result[property] = data[property]
                            drive_results.append(drive_result)
                    drives = {'Controller': controller_name,
                              'Drives': drive_results}
                    result["entries"].append(drives)

        if 'SimpleStorage' in data:
            # Get a list of all storage controllers and build respective URIs
            storage_uri = data["SimpleStorage"]["@odata.id"]
            response = self.get_request(self.root_uri + storage_uri)
            if response['ret'] is False:
                return response
            result['ret'] = True
            data = response['data']

            for controller in data[u'Members']:
                controller_list.append(controller[u'@odata.id'])

            for c in controller_list:
                uri = self.root_uri + c
                response = self.get_request(uri)
                if response['ret'] is False:
                    return response
                data = response['data']
                if 'Name' in data:
                    controller_name = data['Name']
                else:
                    sc_id = data.get('Id', '1')
                    controller_name = 'Controller %s' % sc_id
                drive_results = []
                for device in data[u'Devices']:
                    drive_result = {}
                    for property in properties:
                        if property in device:
                            drive_result[property] = device[property]
                    drive_results.append(drive_result)
                drives = {'Controller': controller_name,
                          'Drives': drive_results}
                result["entries"].append(drives)

        return result

    def get_multi_disk_inventory(self):
        return self.aggregate_systems(self.get_disk_inventory)

    def get_volume_inventory(self, systems_uri):
        result = {'entries': []}
        controller_list = []
        volume_list = []
        # Get these entries, but does not fail if not found
        properties = ['Id', 'Name', 'RAIDType', 'VolumeType', 'BlockSizeBytes',
                      'Capacity', 'CapacityBytes', 'CapacitySources',
                      'Encrypted', 'EncryptionTypes', 'Identifiers',
                      'Operations', 'OptimumIOSizeBytes', 'AccessCapabilities',
                      'AllocatedPools', 'Status']

        # Find Storage service
        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        if 'SimpleStorage' not in data and 'Storage' not in data:
            return {'ret': False, 'msg': "SimpleStorage and Storage resource \
                     not found"}

        if 'Storage' in data:
            # Get a list of all storage controllers and build respective URIs
            storage_uri = data[u'Storage'][u'@odata.id']
            response = self.get_request(self.root_uri + storage_uri)
            if response['ret'] is False:
                return response
            result['ret'] = True
            data = response['data']

            if data.get('Members'):
                for controller in data[u'Members']:
                    controller_list.append(controller[u'@odata.id'])
                for idx, c in enumerate(controller_list):
                    uri = self.root_uri + c
                    response = self.get_request(uri)
                    if response['ret'] is False:
                        return response
                    data = response['data']
                    controller_name = 'Controller %s' % str(idx)
                    if 'Controllers' in data:
                        response = self.get_request(self.root_uri + data['Controllers'][u'@odata.id'])
                        if response['ret'] is False:
                            return response
                        c_data = response['data']

                        if c_data.get('Members') and c_data['Members']:
                            response = self.get_request(self.root_uri + c_data['Members'][0][u'@odata.id'])
                            if response['ret'] is False:
                                return response
                            member_data = response['data']

                            if member_data:
                                if 'Name' in member_data:
                                    controller_name = member_data['Name']
                                else:
                                    controller_id = member_data.get('Id', '1')
                                    controller_name = 'Controller %s' % controller_id
                    elif 'StorageControllers' in data:
                        sc = data['StorageControllers']
                        if sc:
                            if 'Name' in sc[0]:
                                controller_name = sc[0]['Name']
                            else:
                                sc_id = sc[0].get('Id', '1')
                                controller_name = 'Controller %s' % sc_id
                    volume_results = []
                    volume_list = []
                    if 'Volumes' in data:
                        # Get a list of all volumes and build respective URIs
                        volumes_uri = data[u'Volumes'][u'@odata.id']
                        response = self.get_request(self.root_uri + volumes_uri)
                        data = response['data']

                        if data.get('Members'):
                            for volume in data[u'Members']:
                                volume_list.append(volume[u'@odata.id'])
                            for v in volume_list:
                                uri = self.root_uri + v
                                response = self.get_request(uri)
                                if response['ret'] is False:
                                    return response
                                data = response['data']

                                volume_result = {}
                                for property in properties:
                                    if property in data:
                                        if data[property] is not None:
                                            volume_result[property] = data[property]

                                # Get related Drives Id
                                drive_id_list = []
                                if 'Links' in data:
                                    if 'Drives' in data[u'Links']:
                                        for link in data[u'Links'][u'Drives']:
                                            drive_id_link = link[u'@odata.id']
                                            drive_id = drive_id_link.split("/")[-1]
                                            drive_id_list.append({'Id': drive_id})
                                        volume_result['Linked_drives'] = drive_id_list
                                volume_results.append(volume_result)
                    volumes = {'Controller': controller_name,
                               'Volumes': volume_results}
                    result["entries"].append(volumes)
        else:
            return {'ret': False, 'msg': "Storage resource not found"}

        return result

    def get_multi_volume_inventory(self):
        return self.aggregate_systems(self.get_volume_inventory)

    def manage_system_indicator_led(self, command):
        return self.manage_indicator_led(command, self.systems_uri)

    def manage_chassis_indicator_led(self, command):
        return self.manage_indicator_led(command, self.chassis_uri)

    def manage_indicator_led(self, command, resource_uri=None):
        # If no resource is specified; default to the Chassis resource
        if resource_uri is None:
            resource_uri = self.chassis_uri

        # Perform a PATCH on the IndicatorLED property based on the requested command
        payloads = {'IndicatorLedOn': 'Lit', 'IndicatorLedOff': 'Off', "IndicatorLedBlink": 'Blinking'}
        if command not in payloads.keys():
            return {'ret': False, 'msg': 'Invalid command (%s)' % command}
        payload = {'IndicatorLED': payloads[command]}
        resp = self.patch_request(self.root_uri + resource_uri, payload, check_pyld=True)
        if resp['ret'] and resp['changed']:
            resp['msg'] = 'Set IndicatorLED to %s' % payloads[command]
        return resp

    def _map_reset_type(self, reset_type, allowable_values):
        equiv_types = {
            'On': 'ForceOn',
            'ForceOn': 'On',
            'ForceOff': 'GracefulShutdown',
            'GracefulShutdown': 'ForceOff',
            'GracefulRestart': 'ForceRestart',
            'ForceRestart': 'GracefulRestart'
        }

        if reset_type in allowable_values:
            return reset_type
        if reset_type not in equiv_types:
            return reset_type
        mapped_type = equiv_types[reset_type]
        if mapped_type in allowable_values:
            return mapped_type
        return reset_type

    def manage_system_power(self, command):
        return self.manage_power(command, self.systems_uri,
                                 '#ComputerSystem.Reset')

    def manage_manager_power(self, command, wait=False, wait_timeout=120):
        return self.manage_power(command, self.manager_uri,
                                 '#Manager.Reset', wait, wait_timeout)

    def manage_power(self, command, resource_uri, action_name, wait=False,
                     wait_timeout=120):
        key = "Actions"
        reset_type_values = ['On', 'ForceOff', 'GracefulShutdown',
                             'GracefulRestart', 'ForceRestart', 'Nmi',
                             'ForceOn', 'PushPowerButton', 'PowerCycle']

        # command should be PowerOn, PowerForceOff, etc.
        if not command.startswith('Power'):
            return {'ret': False, 'msg': 'Invalid Command (%s)' % command}

        # Commands (except PowerCycle) will be stripped of the 'Power' prefix
        if command == 'PowerCycle':
            reset_type = command
        else:
            reset_type = command[5:]

        # map Reboot to a ResetType that does a reboot
        if reset_type == 'Reboot':
            reset_type = 'GracefulRestart'

        if reset_type not in reset_type_values:
            return {'ret': False, 'msg': 'Invalid Command (%s)' % command}

        # read the resource and get the current power state
        response = self.get_request(self.root_uri + resource_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        power_state = data.get('PowerState')

        # if power is already in target state, nothing to do
        if power_state == "On" and reset_type in ['On', 'ForceOn']:
            return {'ret': True, 'changed': False}
        if power_state == "Off" and reset_type in ['GracefulShutdown', 'ForceOff']:
            return {'ret': True, 'changed': False}

        # get the reset Action and target URI
        if key not in data or action_name not in data[key]:
            return {'ret': False, 'msg': 'Action %s not found' % action_name}
        reset_action = data[key][action_name]
        if 'target' not in reset_action:
            return {'ret': False,
                    'msg': 'target URI missing from Action %s' % action_name}
        action_uri = reset_action['target']

        # get AllowableValues
        ai = self._get_all_action_info_values(reset_action)
        allowable_values = ai.get('ResetType', {}).get('AllowableValues', [])

        # map ResetType to an allowable value if needed
        if reset_type not in allowable_values:
            reset_type = self._map_reset_type(reset_type, allowable_values)

        # define payload
        payload = {'ResetType': reset_type}

        # POST to Action URI
        response = self.post_request(self.root_uri + action_uri, payload)
        if response['ret'] is False:
            return response

        # If requested to wait for the service to be available again, block
        # until it's ready
        if wait:
            elapsed_time = 0
            start_time = time.time()
            # Start with a large enough sleep.  Some services will process new
            # requests while in the middle of shutting down, thus breaking out
            # early.
            time.sleep(30)

            # Periodically check for the service's availability.
            while elapsed_time <= wait_timeout:
                status = self.check_service_availability()
                if status['available']:
                    # It's available; we're done
                    break
                time.sleep(5)
                elapsed_time = time.time() - start_time

            if elapsed_time > wait_timeout:
                # Exhausted the wait timer; error
                return {'ret': False, 'changed': True,
                        'msg': 'The service did not become available after %d seconds' % wait_timeout}
        return {'ret': True, 'changed': True}

    def manager_reset_to_defaults(self, command):
        return self.reset_to_defaults(command, self.manager_uri,
                                      '#Manager.ResetToDefaults')

    def reset_to_defaults(self, command, resource_uri, action_name):
        key = "Actions"
        reset_type_values = ['ResetAll',
                             'PreserveNetworkAndUsers',
                             'PreserveNetwork']

        if command not in reset_type_values:
            return {'ret': False, 'msg': 'Invalid Command (%s)' % command}

        # read the resource and get the current power state
        response = self.get_request(self.root_uri + resource_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        # get the reset Action and target URI
        if key not in data or action_name not in data[key]:
            return {'ret': False, 'msg': 'Action %s not found' % action_name}
        reset_action = data[key][action_name]
        if 'target' not in reset_action:
            return {'ret': False,
                    'msg': 'target URI missing from Action %s' % action_name}
        action_uri = reset_action['target']

        # get AllowableValues
        ai = self._get_all_action_info_values(reset_action)
        allowable_values = ai.get('ResetType', {}).get('AllowableValues', [])

        # map ResetType to an allowable value if needed
        if allowable_values and command not in allowable_values:
            return {'ret': False,
                    'msg': 'Specified reset type (%s) not supported '
                           'by service. Supported types: %s' %
                           (command, allowable_values)}

        # define payload
        payload = {'ResetType': command}

        # POST to Action URI
        response = self.post_request(self.root_uri + action_uri, payload)
        if response['ret'] is False:
            return response
        return {'ret': True, 'changed': True}

    def _find_account_uri(self, username=None, acct_id=None):
        if not any((username, acct_id)):
            return {'ret': False, 'msg':
                    'Must provide either account_id or account_username'}

        response = self.get_request(self.root_uri + self.accounts_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        uris = [a.get('@odata.id') for a in data.get('Members', []) if
                a.get('@odata.id')]
        for uri in uris:
            response = self.get_request(self.root_uri + uri)
            if response['ret'] is False:
                continue
            data = response['data']
            headers = response['headers']
            if username:
                if username == data.get('UserName'):
                    return {'ret': True, 'data': data,
                            'headers': headers, 'uri': uri}
            if acct_id:
                if acct_id == data.get('Id'):
                    return {'ret': True, 'data': data,
                            'headers': headers, 'uri': uri}

        return {'ret': False, 'no_match': True, 'msg':
                'No account with the given account_id or account_username found'}

    def _find_empty_account_slot(self):
        response = self.get_request(self.root_uri + self.accounts_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        uris = [a.get('@odata.id') for a in data.get('Members', []) if
                a.get('@odata.id')]
        if uris:
            # first slot may be reserved, so move to end of list
            uris += [uris.pop(0)]
        for uri in uris:
            response = self.get_request(self.root_uri + uri)
            if response['ret'] is False:
                continue
            data = response['data']
            headers = response['headers']
            if data.get('UserName') == "" and not data.get('Enabled', True):
                return {'ret': True, 'data': data,
                        'headers': headers, 'uri': uri}

        return {'ret': False, 'no_match': True, 'msg':
                'No empty account slot found'}

    def list_users(self):
        result = {}
        # listing all users has always been slower than other operations, why?
        user_list = []
        users_results = []
        # Get these entries, but does not fail if not found
        properties = ['Id', 'Name', 'UserName', 'RoleId', 'Locked', 'Enabled',
                      'AccountTypes', 'OEMAccountTypes']

        response = self.get_request(self.root_uri + self.accounts_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        for users in data.get('Members', []):
            user_list.append(users[u'@odata.id'])   # user_list[] are URIs

        # for each user, get details
        for uri in user_list:
            user = {}
            response = self.get_request(self.root_uri + uri)
            if response['ret'] is False:
                return response
            data = response['data']

            for property in properties:
                if property in data:
                    user[property] = data[property]

            # Filter out empty account slots
            # An empty account slot can be detected if the username is an empty
            # string and if the account is disabled
            if user.get('UserName', '') == '' and not user.get('Enabled', False):
                continue

            users_results.append(user)
        result["entries"] = users_results
        return result

    def add_user_via_patch(self, user):
        if user.get('account_id'):
            # If Id slot specified, use it
            response = self._find_account_uri(acct_id=user.get('account_id'))
        else:
            # Otherwise find first empty slot
            response = self._find_empty_account_slot()

        if not response['ret']:
            return response
        uri = response['uri']
        payload = {}
        if user.get('account_username'):
            payload['UserName'] = user.get('account_username')
        if user.get('account_password'):
            payload['Password'] = user.get('account_password')
        if user.get('account_roleid'):
            payload['RoleId'] = user.get('account_roleid')
        if user.get('account_accounttypes'):
            payload['AccountTypes'] = user.get('account_accounttypes')
        if user.get('account_oemaccounttypes'):
            payload['OEMAccountTypes'] = user.get('account_oemaccounttypes')
        return self.patch_request(self.root_uri + uri, payload, check_pyld=True)

    def add_user(self, user):
        if not user.get('account_username'):
            return {'ret': False, 'msg':
                    'Must provide account_username for AddUser command'}

        response = self._find_account_uri(username=user.get('account_username'))
        if response['ret']:
            # account_username already exists, nothing to do
            return {'ret': True, 'changed': False}

        response = self.get_request(self.root_uri + self.accounts_uri)
        if not response['ret']:
            return response
        headers = response['headers']

        if 'allow' in headers:
            methods = [m.strip() for m in headers.get('allow').split(',')]
            if 'POST' not in methods:
                # if Allow header present and POST not listed, add via PATCH
                return self.add_user_via_patch(user)

        payload = {}
        if user.get('account_username'):
            payload['UserName'] = user.get('account_username')
        if user.get('account_password'):
            payload['Password'] = user.get('account_password')
        if user.get('account_roleid'):
            payload['RoleId'] = user.get('account_roleid')
        if user.get('account_accounttypes'):
            payload['AccountTypes'] = user.get('account_accounttypes')
        if user.get('account_oemaccounttypes'):
            payload['OEMAccountTypes'] = user.get('account_oemaccounttypes')
        if user.get('account_id'):
            payload['Id'] = user.get('account_id')

        response = self.post_request(self.root_uri + self.accounts_uri, payload)
        if not response['ret']:
            if response.get('status') == 405:
                # if POST returned a 405, try to add via PATCH
                return self.add_user_via_patch(user)
            else:
                return response
        return {'ret': True}

    def enable_user(self, user):
        response = self._find_account_uri(username=user.get('account_username'),
                                          acct_id=user.get('account_id'))
        if not response['ret']:
            return response
        uri = response['uri']

        payload = {'Enabled': True}
        return self.patch_request(self.root_uri + uri, payload, check_pyld=True)

    def delete_user_via_patch(self, user, uri=None, data=None):
        if not uri:
            response = self._find_account_uri(username=user.get('account_username'),
                                              acct_id=user.get('account_id'))
            if not response['ret']:
                return response
            uri = response['uri']
            data = response['data']

        payload = {'UserName': ''}
        if data.get('Enabled', False):
            payload['Enabled'] = False
        return self.patch_request(self.root_uri + uri, payload, check_pyld=True)

    def delete_user(self, user):
        response = self._find_account_uri(username=user.get('account_username'),
                                          acct_id=user.get('account_id'))
        if not response['ret']:
            if response.get('no_match'):
                # account does not exist, nothing to do
                return {'ret': True, 'changed': False}
            else:
                # some error encountered
                return response

        uri = response['uri']
        headers = response['headers']
        data = response['data']

        if 'allow' in headers:
            methods = [m.strip() for m in headers.get('allow').split(',')]
            if 'DELETE' not in methods:
                # if Allow header present and DELETE not listed, del via PATCH
                return self.delete_user_via_patch(user, uri=uri, data=data)

        response = self.delete_request(self.root_uri + uri)
        if not response['ret']:
            if response.get('status') == 405:
                # if DELETE returned a 405, try to delete via PATCH
                return self.delete_user_via_patch(user, uri=uri, data=data)
            else:
                return response
        return {'ret': True}

    def disable_user(self, user):
        response = self._find_account_uri(username=user.get('account_username'),
                                          acct_id=user.get('account_id'))
        if not response['ret']:
            return response

        uri = response['uri']
        payload = {'Enabled': False}
        return self.patch_request(self.root_uri + uri, payload, check_pyld=True)

    def update_user_role(self, user):
        if not user.get('account_roleid'):
            return {'ret': False, 'msg':
                    'Must provide account_roleid for UpdateUserRole command'}

        response = self._find_account_uri(username=user.get('account_username'),
                                          acct_id=user.get('account_id'))
        if not response['ret']:
            return response

        uri = response['uri']
        payload = {'RoleId': user['account_roleid']}
        return self.patch_request(self.root_uri + uri, payload, check_pyld=True)

    def update_user_password(self, user):
        if not user.get('account_password'):
            return {'ret': False, 'msg':
                    'Must provide account_password for UpdateUserPassword command'}

        response = self._find_account_uri(username=user.get('account_username'),
                                          acct_id=user.get('account_id'))
        if not response['ret']:
            return response

        uri = response['uri']
        payload = {'Password': user['account_password']}
        return self.patch_request(self.root_uri + uri, payload, check_pyld=True)

    def update_user_name(self, user):
        if not user.get('account_updatename'):
            return {'ret': False, 'msg':
                    'Must provide account_updatename for UpdateUserName command'}

        response = self._find_account_uri(username=user.get('account_username'),
                                          acct_id=user.get('account_id'))
        if not response['ret']:
            return response

        uri = response['uri']
        payload = {'UserName': user['account_updatename']}
        return self.patch_request(self.root_uri + uri, payload, check_pyld=True)

    def update_accountservice_properties(self, user):
        account_properties = user.get('account_properties')
        if account_properties is None:
            return {'ret': False, 'msg':
                    'Must provide account_properties for UpdateAccountServiceProperties command'}

        # Find the AccountService resource
        response = self.get_request(self.root_uri + self.service_root)
        if response['ret'] is False:
            return response
        data = response['data']
        accountservice_uri = data.get("AccountService", {}).get("@odata.id")
        if accountservice_uri is None:
            return {'ret': False, 'msg': "AccountService resource not found"}

        # Perform a PATCH on the AccountService resource with the requested properties
        resp = self.patch_request(self.root_uri + accountservice_uri, account_properties, check_pyld=True)
        if resp['ret'] and resp['changed']:
            resp['msg'] = 'Modified account service'
        return resp

    def get_sessions(self):
        result = {}
        # listing all users has always been slower than other operations, why?
        session_list = []
        sessions_results = []
        # Get these entries, but does not fail if not found
        properties = ['Description', 'Id', 'Name', 'UserName']

        response = self.get_request(self.root_uri + self.sessions_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        for sessions in data[u'Members']:
            session_list.append(sessions[u'@odata.id'])   # session_list[] are URIs

        # for each session, get details
        for uri in session_list:
            session = {}
            response = self.get_request(self.root_uri + uri)
            if response['ret'] is False:
                return response
            data = response['data']

            for property in properties:
                if property in data:
                    session[property] = data[property]

            sessions_results.append(session)
        result["entries"] = sessions_results
        return result

    def clear_sessions(self):
        response = self.get_request(self.root_uri + self.sessions_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        # if no active sessions, return as success
        if data['Members@odata.count'] == 0:
            return {'ret': True, 'changed': False, 'msg': "There are no active sessions"}

        # loop to delete every active session
        for session in data[u'Members']:
            response = self.delete_request(self.root_uri + session[u'@odata.id'])
            if response['ret'] is False:
                return response

        return {'ret': True, 'changed': True, 'msg': "Cleared all sessions successfully"}

    def create_session(self):
        if not self.creds.get('user') or not self.creds.get('pswd'):
            return {'ret': False, 'msg':
                    'Must provide the username and password parameters for '
                    'the CreateSession command'}

        payload = {
            'UserName': self.creds['user'],
            'Password': self.creds['pswd']
        }
        response = self.post_request(self.root_uri + self.sessions_uri, payload)
        if response['ret'] is False:
            return response

        headers = response['headers']
        if 'x-auth-token' not in headers:
            return {'ret': False, 'msg':
                    'The service did not return the X-Auth-Token header in '
                    'the response from the Sessions collection POST'}

        if 'location' not in headers:
            self.module.warn(
                'The service did not return the Location header for the '
                'session URL in the response from the Sessions collection '
                'POST')
            session_uri = None
        else:
            session_uri = urlparse(headers.get('location')).path

        session = dict()
        session['token'] = headers.get('x-auth-token')
        session['uri'] = session_uri
        return {'ret': True, 'changed': True, 'session': session,
                'msg': 'Session created successfully'}

    def delete_session(self, session_uri):
        if not session_uri:
            return {'ret': False, 'msg':
                    'Must provide the session_uri parameter for the '
                    'DeleteSession command'}

        response = self.delete_request(self.root_uri + session_uri)
        if response['ret'] is False:
            return response

        return {'ret': True, 'changed': True,
                'msg': 'Session deleted successfully'}

    def get_firmware_update_capabilities(self):
        result = {}
        response = self.get_request(self.root_uri + self.update_uri)
        if response['ret'] is False:
            return response

        result['ret'] = True

        result['entries'] = {}

        data = response['data']

        result['multipart_supported'] = 'MultipartHttpPushUri' in data

        if "Actions" in data:
            actions = data['Actions']
            if len(actions) > 0:
                for key in actions.keys():
                    action = actions.get(key)
                    if 'title' in action:
                        title = action['title']
                    else:
                        title = key
                    result['entries'][title] = action.get('TransferProtocol@Redfish.AllowableValues',
                                                          ["Key TransferProtocol@Redfish.AllowableValues not found"])
            else:
                return {'ret': "False", 'msg': "Actions list is empty."}
        else:
            return {'ret': "False", 'msg': "Key Actions not found."}
        return result

    def _software_inventory(self, uri):
        result = {}
        result['entries'] = []

        while uri:
            response = self.get_request(self.root_uri + uri)
            if response['ret'] is False:
                return response
            result['ret'] = True

            data = response['data']
            if data.get('Members@odata.nextLink'):
                uri = data.get('Members@odata.nextLink')
            else:
                uri = None

            for member in data[u'Members']:
                fw_uri = self.root_uri + member[u'@odata.id']
                # Get details for each software or firmware member
                response = self.get_request(fw_uri)
                if response['ret'] is False:
                    return response
                result['ret'] = True
                data = response['data']
                software = {}
                # Get these standard properties if present
                for key in ['Name', 'Id', 'Status', 'Version', 'Updateable',
                            'SoftwareId', 'LowestSupportedVersion', 'Manufacturer',
                            'ReleaseDate']:
                    if key in data:
                        software[key] = data.get(key)
                result['entries'].append(software)

        return result

    def get_firmware_inventory(self):
        if self.firmware_uri is None:
            return {'ret': False, 'msg': 'No FirmwareInventory resource found'}
        else:
            return self._software_inventory(self.firmware_uri)

    def get_software_inventory(self):
        if self.software_uri is None:
            return {'ret': False, 'msg': 'No SoftwareInventory resource found'}
        else:
            return self._software_inventory(self.software_uri)

    def _operation_results(self, response, data, handle=None):
        """
        Builds the results for an operation from task, job, or action response.

        :param response: HTTP response object
        :param data: HTTP response data
        :param handle: The task or job handle that was last used
        :return: dict containing operation results
        """

        operation_results = {'status': None, 'messages': [], 'handle': None, 'ret': True,
                             'resets_requested': []}

        if response.status == 204:
            # No content; successful, but nothing to return
            # Use the Redfish "Completed" enum from TaskState for the operation status
            operation_results['status'] = 'Completed'
        else:
            # Parse the response body for details

            # Determine the next handle, if any
            operation_results['handle'] = handle
            if response.status == 202:
                # Task generated; get the task monitor URI
                operation_results['handle'] = response.getheader('Location', handle)

            # Pull out the status and messages based on the body format
            if data is not None:
                response_type = data.get('@odata.type', '')
                if response_type.startswith('#Task.') or response_type.startswith('#Job.'):
                    # Task and Job have similar enough structures to treat the same
                    operation_results['status'] = data.get('TaskState', data.get('JobState'))
                    operation_results['messages'] = data.get('Messages', [])
                else:
                    # Error response body, which is a bit of a misnomer since it's used in successful action responses
                    operation_results['status'] = 'Completed'
                    if response.status >= 400:
                        operation_results['status'] = 'Exception'
                    operation_results['messages'] = data.get('error', {}).get('@Message.ExtendedInfo', [])
            else:
                # No response body (or malformed); build based on status code
                operation_results['status'] = 'Completed'
                if response.status == 202:
                    operation_results['status'] = 'New'
                elif response.status >= 400:
                    operation_results['status'] = 'Exception'

            # Clear out the handle if the operation is complete
            if operation_results['status'] in ['Completed', 'Cancelled', 'Exception', 'Killed']:
                operation_results['handle'] = None

            # Scan the messages to see if next steps are needed
            for message in operation_results['messages']:
                message_id = message.get('MessageId')
                if message_id is None:
                    # While this is invalid, treat the lack of a MessageId as "no message"
                    continue

                if message_id.startswith('Update.1.') and message_id.endswith('.OperationTransitionedToJob'):
                    # Operation rerouted to a job; update the status and handle
                    operation_results['status'] = 'New'
                    operation_results['handle'] = message['MessageArgs'][0]
                    operation_results['resets_requested'] = []
                    # No need to process other messages in this case
                    break

                if message_id.startswith('Base.1.') and message_id.endswith('.ResetRequired'):
                    # A reset to some device is needed to continue the update
                    reset = {'uri': message['MessageArgs'][0], 'type': message['MessageArgs'][1]}
                    operation_results['resets_requested'].append(reset)

        return operation_results

    def simple_update(self, update_opts):
        image_uri = update_opts.get('update_image_uri')
        protocol = update_opts.get('update_protocol')
        targets = update_opts.get('update_targets')
        creds = update_opts.get('update_creds')
        apply_time = update_opts.get('update_apply_time')

        if not image_uri:
            return {'ret': False, 'msg':
                    'Must specify update_image_uri for the SimpleUpdate command'}

        response = self.get_request(self.root_uri + self.update_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'Actions' not in data:
            return {'ret': False, 'msg': 'Service does not support SimpleUpdate'}
        if '#UpdateService.SimpleUpdate' not in data['Actions']:
            return {'ret': False, 'msg': 'Service does not support SimpleUpdate'}
        action = data['Actions']['#UpdateService.SimpleUpdate']
        if 'target' not in action:
            return {'ret': False, 'msg': 'Service does not support SimpleUpdate'}
        update_uri = action['target']
        if protocol:
            default_values = ['CIFS', 'FTP', 'SFTP', 'HTTP', 'HTTPS', 'NSF',
                              'SCP', 'TFTP', 'OEM', 'NFS']
            allowable_values = self._get_allowable_values(action,
                                                          'TransferProtocol',
                                                          default_values)
            if protocol not in allowable_values:
                return {'ret': False,
                        'msg': 'Specified update_protocol (%s) not supported '
                               'by service. Supported protocols: %s' %
                               (protocol, allowable_values)}
        if targets:
            allowable_values = self._get_allowable_values(action, 'Targets')
            if allowable_values:
                for target in targets:
                    if target not in allowable_values:
                        return {'ret': False,
                                'msg': 'Specified target (%s) not supported '
                                       'by service. Supported targets: %s' %
                                       (target, allowable_values)}

        payload = {
            'ImageURI': image_uri
        }
        if protocol:
            payload["TransferProtocol"] = protocol
        if targets:
            payload["Targets"] = targets
        if creds:
            if creds.get('username'):
                payload["Username"] = creds.get('username')
            if creds.get('password'):
                payload["Password"] = creds.get('password')
        if apply_time:
            payload["@Redfish.OperationApplyTime"] = apply_time
        response = self.post_request(self.root_uri + update_uri, payload)
        if response['ret'] is False:
            return response
        return {'ret': True, 'changed': True,
                'msg': "SimpleUpdate requested",
                'update_status': self._operation_results(response['resp'], response['data'])}

    def multipath_http_push_update(self, update_opts):
        """
        Provides a software update via the URI specified by the
        MultipartHttpPushUri property.  Callers should adjust the 'timeout'
        variable in the base object to accommodate the size of the image and
        speed of the transfer.  For example, a 200MB image will likely take
        more than the default 10 second timeout.

        :param update_opts: The parameters for the update operation
        :return: dict containing the response of the update request
        """
        image_file = update_opts.get('update_image_file')
        targets = update_opts.get('update_targets')
        apply_time = update_opts.get('update_apply_time')
        oem_params = update_opts.get('update_oem_params')

        # Ensure the image file is provided
        if not image_file:
            return {'ret': False, 'msg':
                    'Must specify update_image_file for the MultipartHTTPPushUpdate command'}
        if not os.path.isfile(image_file):
            return {'ret': False, 'msg':
                    'Must specify a valid file for the MultipartHTTPPushUpdate command'}
        try:
            with open(image_file, 'rb') as f:
                image_payload = f.read()
        except Exception as e:
            return {'ret': False, 'msg':
                    'Could not read file %s' % image_file}

        # Check that multipart HTTP push updates are supported
        response = self.get_request(self.root_uri + self.update_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'MultipartHttpPushUri' not in data:
            return {'ret': False, 'msg': 'Service does not support MultipartHttpPushUri'}
        update_uri = data['MultipartHttpPushUri']

        # Assemble the JSON payload portion of the request
        payload = {"@Redfish.OperationApplyTime": "Immediate"}
        if targets:
            payload["Targets"] = targets
        if apply_time:
            payload["@Redfish.OperationApplyTime"] = apply_time
        if oem_params:
            payload["Oem"] = oem_params
        multipart_payload = {
            'UpdateParameters': {'content': json.dumps(payload), 'mime_type': 'application/json'},
            'UpdateFile': {'filename': image_file, 'content': image_payload, 'mime_type': 'application/octet-stream'}
        }
        response = self.post_request(self.root_uri + update_uri, multipart_payload, multipart=True)
        if response['ret'] is False:
            return response
        return {'ret': True, 'changed': True,
                'msg': "MultipartHTTPPushUpdate requested",
                'update_status': self._operation_results(response['resp'], response['data'])}

    def get_update_status(self, update_handle):
        """
        Gets the status of an update operation.

        :param handle: The task or job handle tracking the update
        :return: dict containing the response of the update status
        """

        if not update_handle:
            return {'ret': False, 'msg': 'Must provide a handle tracking the update.'}

        # Get the task or job tracking the update
        response = self.get_request(self.root_uri + update_handle, allow_no_resp=True)
        if response['ret'] is False:
            return response

        # Inspect the response to build the update status
        return self._operation_results(response['resp'], response['data'], update_handle)

    def perform_requested_update_operations(self, update_handle):
        """
        Performs requested operations to allow the update to continue.

        :param handle: The task or job handle tracking the update
        :return: dict containing the result of the operations
        """

        # Get the current update status
        update_status = self.get_update_status(update_handle)
        if update_status['ret'] is False:
            return update_status

        changed = False

        # Perform any requested updates
        for reset in update_status['resets_requested']:
            resp = self.post_request(self.root_uri + reset['uri'], {'ResetType': reset['type']})
            if resp['ret'] is False:
                # Override the 'changed' indicator since other resets may have
                # been successful
                resp['changed'] = changed
                return resp
            changed = True

        msg = 'No operations required for the update'
        if changed:
            # Will need to consider finetuning this message if the scope of the
            # requested operations grow over time
            msg = 'One or more components reset to continue the update'
        return {'ret': True, 'changed': changed, 'msg': msg}

    def get_bios_attributes(self, systems_uri):
        result = {}
        bios_attributes = {}
        key = "Bios"

        # Search for 'key' entry and extract URI from it
        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        if key not in data:
            return {'ret': False, 'msg': "Key %s not found" % key}

        bios_uri = data[key]["@odata.id"]

        response = self.get_request(self.root_uri + bios_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']
        for attribute in data[u'Attributes'].items():
            bios_attributes[attribute[0]] = attribute[1]
        result["entries"] = bios_attributes
        return result

    def get_multi_bios_attributes(self):
        return self.aggregate_systems(self.get_bios_attributes)

    def _get_boot_options_dict(self, boot):
        # Get these entries from BootOption, if present
        properties = ['DisplayName', 'BootOptionReference']

        # Retrieve BootOptions if present
        if 'BootOptions' in boot and '@odata.id' in boot['BootOptions']:
            boot_options_uri = boot['BootOptions']["@odata.id"]
            # Get BootOptions resource
            response = self.get_request(self.root_uri + boot_options_uri)
            if response['ret'] is False:
                return {}
            data = response['data']

            # Retrieve Members array
            if 'Members' not in data:
                return {}
            members = data['Members']
        else:
            members = []

        # Build dict of BootOptions keyed by BootOptionReference
        boot_options_dict = {}
        for member in members:
            if '@odata.id' not in member:
                return {}
            boot_option_uri = member['@odata.id']
            response = self.get_request(self.root_uri + boot_option_uri)
            if response['ret'] is False:
                return {}
            data = response['data']
            if 'BootOptionReference' not in data:
                return {}
            boot_option_ref = data['BootOptionReference']

            # fetch the props to display for this boot device
            boot_props = {}
            for prop in properties:
                if prop in data:
                    boot_props[prop] = data[prop]

            boot_options_dict[boot_option_ref] = boot_props

        return boot_options_dict

    def get_boot_order(self, systems_uri):
        result = {}

        # Retrieve System resource
        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        # Confirm needed Boot properties are present
        if 'Boot' not in data or 'BootOrder' not in data['Boot']:
            return {'ret': False, 'msg': "Key BootOrder not found"}

        boot = data['Boot']
        boot_order = boot['BootOrder']
        boot_options_dict = self._get_boot_options_dict(boot)

        # Build boot device list
        boot_device_list = []
        for ref in boot_order:
            boot_device_list.append(
                boot_options_dict.get(ref, {'BootOptionReference': ref}))

        result["entries"] = boot_device_list
        return result

    def get_multi_boot_order(self):
        return self.aggregate_systems(self.get_boot_order)

    def get_boot_override(self, systems_uri):
        result = {}

        properties = ["BootSourceOverrideEnabled", "BootSourceOverrideTarget",
                      "BootSourceOverrideMode", "UefiTargetBootSourceOverride", "BootSourceOverrideTarget@Redfish.AllowableValues"]

        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        if 'Boot' not in data:
            return {'ret': False, 'msg': "Key Boot not found"}

        boot = data['Boot']

        boot_overrides = {}
        if "BootSourceOverrideEnabled" in boot:
            if boot["BootSourceOverrideEnabled"] is not False:
                for property in properties:
                    if property in boot:
                        if boot[property] is not None:
                            boot_overrides[property] = boot[property]
        else:
            return {'ret': False, 'msg': "No boot override is enabled."}

        result['entries'] = boot_overrides
        return result

    def get_multi_boot_override(self):
        return self.aggregate_systems(self.get_boot_override)

    def set_bios_default_settings(self):
        # Find the Bios resource from the requested ComputerSystem resource
        response = self.get_request(self.root_uri + self.systems_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        bios_uri = data.get('Bios', {}).get('@odata.id')
        if bios_uri is None:
            return {'ret': False, 'msg': 'Bios resource not found'}

        # Find the URI of the ResetBios action
        response = self.get_request(self.root_uri + bios_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        reset_bios_uri = data.get('Actions', {}).get('#Bios.ResetBios', {}).get('target')
        if reset_bios_uri is None:
            return {'ret': False, 'msg': 'ResetBios action not found'}

        # Perform the ResetBios action
        response = self.post_request(self.root_uri + reset_bios_uri, {})
        if response['ret'] is False:
            return response
        return {'ret': True, 'changed': True, 'msg': "BIOS set to default settings"}

    def set_boot_override(self, boot_opts):
        # Extract the requested boot override options
        bootdevice = boot_opts.get('bootdevice')
        uefi_target = boot_opts.get('uefi_target')
        boot_next = boot_opts.get('boot_next')
        override_enabled = boot_opts.get('override_enabled')
        boot_override_mode = boot_opts.get('boot_override_mode')
        if not bootdevice and override_enabled != 'Disabled':
            return {'ret': False,
                    'msg': "bootdevice option required for temporary boot override"}

        # Get the current boot override options from the Boot property
        response = self.get_request(self.root_uri + self.systems_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        boot = data.get('Boot')
        if boot is None:
            return {'ret': False, 'msg': "Boot property not found"}
        cur_override_mode = boot.get('BootSourceOverrideMode')

        # Check if the requested target is supported by the system
        if override_enabled != 'Disabled':
            annotation = 'BootSourceOverrideTarget@Redfish.AllowableValues'
            if annotation in boot:
                allowable_values = boot[annotation]
                if isinstance(allowable_values, list) and bootdevice not in allowable_values:
                    return {'ret': False,
                            'msg': "Boot device %s not in list of allowable values (%s)" %
                                   (bootdevice, allowable_values)}

        # Build the request payload based on the desired boot override options
        if override_enabled == 'Disabled':
            payload = {
                'Boot': {
                    'BootSourceOverrideEnabled': override_enabled,
                    'BootSourceOverrideTarget': 'None'
                }
            }
        elif bootdevice == 'UefiTarget':
            if not uefi_target:
                return {'ret': False,
                        'msg': "uefi_target option required to SetOneTimeBoot for UefiTarget"}
            payload = {
                'Boot': {
                    'BootSourceOverrideEnabled': override_enabled,
                    'BootSourceOverrideTarget': bootdevice,
                    'UefiTargetBootSourceOverride': uefi_target
                }
            }
            # If needed, also specify UEFI mode
            if cur_override_mode == 'Legacy':
                payload['Boot']['BootSourceOverrideMode'] = 'UEFI'
        elif bootdevice == 'UefiBootNext':
            if not boot_next:
                return {'ret': False,
                        'msg': "boot_next option required to SetOneTimeBoot for UefiBootNext"}
            payload = {
                'Boot': {
                    'BootSourceOverrideEnabled': override_enabled,
                    'BootSourceOverrideTarget': bootdevice,
                    'BootNext': boot_next
                }
            }
            # If needed, also specify UEFI mode
            if cur_override_mode == 'Legacy':
                payload['Boot']['BootSourceOverrideMode'] = 'UEFI'
        else:
            payload = {
                'Boot': {
                    'BootSourceOverrideEnabled': override_enabled,
                    'BootSourceOverrideTarget': bootdevice
                }
            }
            if boot_override_mode:
                payload['Boot']['BootSourceOverrideMode'] = boot_override_mode

        # Apply the requested boot override request
        resp = self.patch_request(self.root_uri + self.systems_uri, payload, check_pyld=True)
        if resp['ret'] is False:
            # WORKAROUND
            # Older Dell systems do not allow BootSourceOverrideEnabled to be
            # specified with UefiTarget as the target device
            vendor = self._get_vendor()['Vendor']
            if vendor == 'Dell':
                if bootdevice == 'UefiTarget' and override_enabled != 'Disabled':
                    payload['Boot'].pop('BootSourceOverrideEnabled', None)
                    resp = self.patch_request(self.root_uri + self.systems_uri, payload, check_pyld=True)
        if resp['ret'] and resp['changed']:
            resp['msg'] = 'Updated the boot override settings'
        return resp

    def set_bios_attributes(self, attributes):
        # Find the Bios resource from the requested ComputerSystem resource
        response = self.get_request(self.root_uri + self.systems_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        bios_uri = data.get('Bios', {}).get('@odata.id')
        if bios_uri is None:
            return {'ret': False, 'msg': 'Bios resource not found'}

        # Get the current BIOS settings
        response = self.get_request(self.root_uri + bios_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        # Make a copy of the attributes dict
        attrs_to_patch = dict(attributes)
        # List to hold attributes not found
        attrs_bad = {}

        # Check the attributes
        for attr_name, attr_value in attributes.items():
            # Check if attribute exists
            if attr_name not in data[u'Attributes']:
                # Remove and proceed to next attribute if this isn't valid
                attrs_bad.update({attr_name: attr_value})
                del attrs_to_patch[attr_name]
                continue

            # If already set to requested value, remove it from PATCH payload
            if data[u'Attributes'][attr_name] == attr_value:
                del attrs_to_patch[attr_name]

        warning = ""
        if attrs_bad:
            warning = "Unsupported attributes %s" % (attrs_bad)

        # Return success w/ changed=False if no attrs need to be changed
        if not attrs_to_patch:
            return {'ret': True, 'changed': False,
                    'msg': "BIOS attributes already set",
                    'warning': warning}

        # Get the SettingsObject URI to apply the attributes
        set_bios_attr_uri = data.get("@Redfish.Settings", {}).get("SettingsObject", {}).get("@odata.id")
        if set_bios_attr_uri is None:
            return {'ret': False, 'msg': "Settings resource for BIOS attributes not found."}

        # Construct payload and issue PATCH command
        payload = {"Attributes": attrs_to_patch}
        response = self.patch_request(self.root_uri + set_bios_attr_uri, payload)
        if response['ret'] is False:
            return response
        return {'ret': True, 'changed': True,
                'msg': "Modified BIOS attributes %s" % (attrs_to_patch),
                'warning': warning}

    def set_boot_order(self, boot_list):
        if not boot_list:
            return {'ret': False,
                    'msg': "boot_order list required for SetBootOrder command"}

        systems_uri = self.systems_uri
        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        # Confirm needed Boot properties are present
        if 'Boot' not in data or 'BootOrder' not in data['Boot']:
            return {'ret': False, 'msg': "Key BootOrder not found"}

        boot = data['Boot']
        boot_order = boot['BootOrder']
        boot_options_dict = self._get_boot_options_dict(boot)

        # Verify the requested boot options are valid
        if boot_options_dict:
            boot_option_references = boot_options_dict.keys()
            for ref in boot_list:
                if ref not in boot_option_references:
                    return {'ret': False,
                            'msg': "BootOptionReference %s not found in BootOptions" % ref}

        # Apply the boot order
        payload = {
            'Boot': {
                'BootOrder': boot_list
            }
        }
        resp = self.patch_request(self.root_uri + systems_uri, payload, check_pyld=True)
        if resp['ret'] and resp['changed']:
            resp['msg'] = 'Modified the boot order'
        return resp

    def set_default_boot_order(self):
        systems_uri = self.systems_uri
        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        # get the #ComputerSystem.SetDefaultBootOrder Action and target URI
        action = '#ComputerSystem.SetDefaultBootOrder'
        if 'Actions' not in data or action not in data['Actions']:
            return {'ret': False, 'msg': 'Action %s not found' % action}
        if 'target' not in data['Actions'][action]:
            return {'ret': False,
                    'msg': 'target URI missing from Action %s' % action}
        action_uri = data['Actions'][action]['target']

        # POST to Action URI
        payload = {}
        response = self.post_request(self.root_uri + action_uri, payload)
        if response['ret'] is False:
            return response
        return {'ret': True, 'changed': True,
                'msg': "BootOrder set to default"}

    def get_chassis_inventory(self):
        result = {}
        chassis_results = []

        # Get these entries, but does not fail if not found
        properties = ['Name', 'Id', 'ChassisType', 'PartNumber', 'AssetTag',
                      'Manufacturer', 'IndicatorLED', 'SerialNumber', 'Model']

        # Go through list
        for chassis_uri in self.chassis_uris:
            response = self.get_request(self.root_uri + chassis_uri)
            if response['ret'] is False:
                return response
            result['ret'] = True
            data = response['data']
            chassis_result = {}
            for property in properties:
                if property in data:
                    chassis_result[property] = data[property]
            chassis_results.append(chassis_result)

        result["entries"] = chassis_results
        return result

    def get_fan_inventory(self):
        result = {}
        fan_results = []
        key = "Thermal"
        # Get these entries, but does not fail if not found
        properties = ['Name', 'FanName', 'Reading', 'ReadingUnits', 'Status']

        # Go through list
        for chassis_uri in self.chassis_uris:
            response = self.get_request(self.root_uri + chassis_uri)
            if response['ret'] is False:
                return response
            result['ret'] = True
            data = response['data']
            if key in data:
                # match: found an entry for "Thermal" information = fans
                thermal_uri = data[key]["@odata.id"]
                response = self.get_request(self.root_uri + thermal_uri)
                if response['ret'] is False:
                    return response
                result['ret'] = True
                data = response['data']

                # Checking if fans are present
                if u'Fans' in data:
                    for device in data[u'Fans']:
                        fan = {}
                        for property in properties:
                            if property in device:
                                fan[property] = device[property]
                        fan_results.append(fan)
                else:
                    return {'ret': False, 'msg': "No Fans present"}
        result["entries"] = fan_results
        return result

    def get_chassis_power(self):
        result = {}
        key = "Power"

        # Get these entries, but does not fail if not found
        properties = ['Name', 'PowerAllocatedWatts',
                      'PowerAvailableWatts', 'PowerCapacityWatts',
                      'PowerConsumedWatts', 'PowerMetrics',
                      'PowerRequestedWatts', 'RelatedItem', 'Status']

        chassis_power_results = []
        # Go through list
        for chassis_uri in self.chassis_uris:
            chassis_power_result = {}
            response = self.get_request(self.root_uri + chassis_uri)
            if response['ret'] is False:
                return response
            result['ret'] = True
            data = response['data']
            if key in data:
                response = self.get_request(self.root_uri + data[key]['@odata.id'])
                data = response['data']
                if 'PowerControl' in data:
                    if len(data['PowerControl']) > 0:
                        data = data['PowerControl'][0]
                        for property in properties:
                            if property in data:
                                chassis_power_result[property] = data[property]
                chassis_power_results.append(chassis_power_result)

        if len(chassis_power_results) > 0:
            result['entries'] = chassis_power_results
            return result
        else:
            return {'ret': False, 'msg': 'Power information not found.'}

    def get_chassis_thermals(self):
        result = {}
        sensors = []
        key = "Thermal"

        # Get these entries, but does not fail if not found
        properties = ['Name', 'PhysicalContext', 'UpperThresholdCritical',
                      'UpperThresholdFatal', 'UpperThresholdNonCritical',
                      'LowerThresholdCritical', 'LowerThresholdFatal',
                      'LowerThresholdNonCritical', 'MaxReadingRangeTemp',
                      'MinReadingRangeTemp', 'ReadingCelsius', 'RelatedItem',
                      'SensorNumber', 'Status']

        # Go through list
        for chassis_uri in self.chassis_uris:
            response = self.get_request(self.root_uri + chassis_uri)
            if response['ret'] is False:
                return response
            result['ret'] = True
            data = response['data']
            if key in data:
                thermal_uri = data[key]["@odata.id"]
                response = self.get_request(self.root_uri + thermal_uri)
                if response['ret'] is False:
                    return response
                result['ret'] = True
                data = response['data']
                if "Temperatures" in data:
                    for sensor in data[u'Temperatures']:
                        sensor_result = {}
                        for property in properties:
                            if property in sensor:
                                if sensor[property] is not None:
                                    sensor_result[property] = sensor[property]
                        sensors.append(sensor_result)

        if sensors is None:
            return {'ret': False, 'msg': 'Key Temperatures was not found.'}

        result['entries'] = sensors
        return result

    def get_cpu_inventory(self, systems_uri):
        result = {}
        cpu_list = []
        cpu_results = []
        key = "Processors"
        # Get these entries, but does not fail if not found
        properties = ['Id', 'Name', 'Manufacturer', 'Model', 'MaxSpeedMHz',
                      'ProcessorArchitecture', 'TotalCores', 'TotalThreads', 'Status']

        # Search for 'key' entry and extract URI from it
        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        if key not in data:
            return {'ret': False, 'msg': "Key %s not found" % key}

        processors_uri = data[key]["@odata.id"]

        # Get a list of all CPUs and build respective URIs
        response = self.get_request(self.root_uri + processors_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        for cpu in data[u'Members']:
            cpu_list.append(cpu[u'@odata.id'])

        for c in cpu_list:
            cpu = {}
            uri = self.root_uri + c
            response = self.get_request(uri)
            if response['ret'] is False:
                return response
            data = response['data']

            for property in properties:
                if property in data:
                    cpu[property] = data[property]

            cpu_results.append(cpu)
        result["entries"] = cpu_results
        return result

    def get_multi_cpu_inventory(self):
        return self.aggregate_systems(self.get_cpu_inventory)

    def get_memory_inventory(self, systems_uri):
        result = {}
        memory_list = []
        memory_results = []
        key = "Memory"
        # Get these entries, but does not fail if not found
        properties = ['Id', 'SerialNumber', 'MemoryDeviceType', 'PartNumber',
                      'MemoryLocation', 'RankCount', 'CapacityMiB', 'OperatingMemoryModes', 'Status', 'Manufacturer', 'Name']

        # Search for 'key' entry and extract URI from it
        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        if key not in data:
            return {'ret': False, 'msg': "Key %s not found" % key}

        memory_uri = data[key]["@odata.id"]

        # Get a list of all DIMMs and build respective URIs
        response = self.get_request(self.root_uri + memory_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        for dimm in data[u'Members']:
            memory_list.append(dimm[u'@odata.id'])

        for m in memory_list:
            dimm = {}
            uri = self.root_uri + m
            response = self.get_request(uri)
            if response['ret'] is False:
                return response
            data = response['data']

            if "Status" in data:
                if "State" in data["Status"]:
                    if data["Status"]["State"] == "Absent":
                        continue
            else:
                continue

            for property in properties:
                if property in data:
                    dimm[property] = data[property]

            memory_results.append(dimm)
        result["entries"] = memory_results
        return result

    def get_multi_memory_inventory(self):
        return self.aggregate_systems(self.get_memory_inventory)

    def get_nic(self, resource_uri):
        result = {}
        properties = ['Name', 'Id', 'Description', 'FQDN', 'IPv4Addresses', 'IPv6Addresses',
                      'NameServers', 'MACAddress', 'PermanentMACAddress',
                      'SpeedMbps', 'MTUSize', 'AutoNeg', 'Status', 'LinkStatus']
        response = self.get_request(self.root_uri + resource_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']
        nic = {}
        for property in properties:
            if property in data:
                nic[property] = data[property]
        result['entries'] = nic
        return result

    def get_nic_inventory(self, resource_uri):
        result = {}
        nic_list = []
        nic_results = []
        key = "EthernetInterfaces"

        response = self.get_request(self.root_uri + resource_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        if key not in data:
            return {'ret': False, 'msg': "Key %s not found" % key}

        ethernetinterfaces_uri = data[key]["@odata.id"]

        # Get a list of all network controllers and build respective URIs
        response = self.get_request(self.root_uri + ethernetinterfaces_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        for nic in data[u'Members']:
            nic_list.append(nic[u'@odata.id'])

        for n in nic_list:
            nic = self.get_nic(n)
            if nic['ret']:
                nic_results.append(nic['entries'])
        result["entries"] = nic_results
        return result

    def get_multi_nic_inventory(self, resource_type):
        ret = True
        entries = []

        #  Given resource_type, use the proper URI
        if resource_type == 'Systems':
            resource_uris = self.systems_uris
        elif resource_type == 'Manager':
            resource_uris = self.manager_uris

        for resource_uri in resource_uris:
            inventory = self.get_nic_inventory(resource_uri)
            ret = inventory.pop('ret') and ret
            if 'entries' in inventory:
                entries.append(({'resource_uri': resource_uri},
                                inventory['entries']))
        return dict(ret=ret, entries=entries)

    def get_virtualmedia(self, resource_uri):
        result = {}
        virtualmedia_list = []
        virtualmedia_results = []
        key = "VirtualMedia"
        # Get these entries, but does not fail if not found
        properties = ['Description', 'ConnectedVia', 'Id', 'MediaTypes',
                      'Image', 'ImageName', 'Name', 'WriteProtected',
                      'TransferMethod', 'TransferProtocolType']

        response = self.get_request(self.root_uri + resource_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        if key not in data:
            return {'ret': False, 'msg': "Key %s not found" % key}

        virtualmedia_uri = data[key]["@odata.id"]

        # Get a list of all virtual media and build respective URIs
        response = self.get_request(self.root_uri + virtualmedia_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        for virtualmedia in data[u'Members']:
            virtualmedia_list.append(virtualmedia[u'@odata.id'])

        for n in virtualmedia_list:
            virtualmedia = {}
            uri = self.root_uri + n
            response = self.get_request(uri)
            if response['ret'] is False:
                return response
            data = response['data']

            for property in properties:
                if property in data:
                    virtualmedia[property] = data[property]

            virtualmedia_results.append(virtualmedia)
        result["entries"] = virtualmedia_results
        return result

    def get_multi_virtualmedia(self, resource_type='Manager'):
        ret = True
        entries = []

        #  Given resource_type, use the proper URI
        if resource_type == 'Systems':
            resource_uris = self.systems_uris
        elif resource_type == 'Manager':
            resource_uris = self.manager_uris

        for resource_uri in resource_uris:
            virtualmedia = self.get_virtualmedia(resource_uri)
            ret = virtualmedia.pop('ret') and ret
            if 'entries' in virtualmedia:
                entries.append(({'resource_uri': resource_uri},
                               virtualmedia['entries']))
        return dict(ret=ret, entries=entries)

    @staticmethod
    def _find_empty_virt_media_slot(resources, media_types,
                                    media_match_strict=True, vendor=''):
        for uri, data in resources.items():
            # check MediaTypes
            if 'MediaTypes' in data and media_types:
                if not set(media_types).intersection(set(data['MediaTypes'])):
                    continue
            else:
                if media_match_strict:
                    continue
            # Base on current Lenovo server capability, filter out slot RDOC1/2 and Remote1/2/3/4 which are not supported to Insert/Eject.
            if vendor == 'Lenovo' and ('RDOC' in uri or 'Remote' in uri):
                continue
            # if ejected, 'Inserted' should be False and 'ImageName' cleared
            if (not data.get('Inserted', False) and
                    not data.get('ImageName')):
                return uri, data
        return None, None

    @staticmethod
    def _virt_media_image_inserted(resources, image_url):
        for uri, data in resources.items():
            if data.get('Image'):
                if urlparse(image_url) == urlparse(data.get('Image')):
                    if data.get('Inserted', False) and data.get('ImageName'):
                        return True
        return False

    @staticmethod
    def _find_virt_media_to_eject(resources, image_url):
        matched_uri, matched_data = None, None
        for uri, data in resources.items():
            if data.get('Image'):
                if urlparse(image_url) == urlparse(data.get('Image')):
                    matched_uri, matched_data = uri, data
                    if data.get('Inserted', True) and data.get('ImageName', 'x'):
                        return uri, data, True
        return matched_uri, matched_data, False

    def _read_virt_media_resources(self, uri_list):
        resources = {}
        headers = {}
        for uri in uri_list:
            response = self.get_request(self.root_uri + uri)
            if response['ret'] is False:
                continue
            resources[uri] = response['data']
            headers[uri] = response['headers']
        return resources, headers

    @staticmethod
    def _insert_virt_media_payload(options, param_map, data, ai):
        payload = {
            'Image': options.get('image_url')
        }
        for param, option in param_map.items():
            if options.get(option) is not None and param in data:
                allowable = ai.get(param, {}).get('AllowableValues', [])
                if allowable and options.get(option) not in allowable:
                    return {'ret': False,
                            'msg': "Value '%s' specified for option '%s' not "
                                   "in list of AllowableValues %s" % (
                                       options.get(option), option,
                                       allowable)}
                payload[param] = options.get(option)
        return payload

    def virtual_media_insert_via_patch(self, options, param_map, uri, data, image_only=False):
        # get AllowableValues
        ai = {
            k[:-24]: {'AllowableValues': v}
            for k, v in data.items()
            if k.endswith('@Redfish.AllowableValues')
        }
        # construct payload
        payload = self._insert_virt_media_payload(options, param_map, data, ai)
        if 'Inserted' not in payload and not image_only:
            # Add Inserted to the payload if needed
            payload['Inserted'] = True

        # PATCH the resource
        resp = self.patch_request(self.root_uri + uri, payload, check_pyld=True)
        if resp['ret'] is False:
            # WORKAROUND
            # Older HPE systems with iLO 4 and Supermicro do not support
            # specifying Inserted or WriteProtected
            vendor = self._get_vendor()['Vendor']
            if vendor == 'HPE' or vendor == 'Supermicro':
                payload.pop('Inserted', None)
                payload.pop('WriteProtected', None)
                resp = self.patch_request(self.root_uri + uri, payload, check_pyld=True)
        if resp['ret'] and resp['changed']:
            resp['msg'] = 'VirtualMedia inserted'
        return resp

    def virtual_media_insert(self, options, resource_type='Manager'):
        param_map = {
            'Inserted': 'inserted',
            'WriteProtected': 'write_protected',
            'UserName': 'username',
            'Password': 'password',
            'TransferProtocolType': 'transfer_protocol_type',
            'TransferMethod': 'transfer_method'
        }
        image_url = options.get('image_url')
        if not image_url:
            return {'ret': False,
                    'msg': "image_url option required for VirtualMediaInsert"}
        media_types = options.get('media_types')

        # locate and read the VirtualMedia resources
        #  Given resource_type, use the proper URI
        if resource_type == 'Systems':
            resource_uri = self.systems_uri
        elif resource_type == 'Manager':
            resource_uri = self.manager_uri
        response = self.get_request(self.root_uri + resource_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'VirtualMedia' not in data:
            return {'ret': False, 'msg': "VirtualMedia resource not found"}

        virt_media_uri = data["VirtualMedia"]["@odata.id"]
        response = self.get_request(self.root_uri + virt_media_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        virt_media_list = []
        for member in data[u'Members']:
            virt_media_list.append(member[u'@odata.id'])
        resources, headers = self._read_virt_media_resources(virt_media_list)

        # see if image already inserted; if so, nothing to do
        if self._virt_media_image_inserted(resources, image_url):
            return {'ret': True, 'changed': False,
                    'msg': "VirtualMedia '%s' already inserted" % image_url}

        # find an empty slot to insert the media
        # try first with strict media_type matching
        vendor = self._get_vendor()['Vendor']
        uri, data = self._find_empty_virt_media_slot(
            resources, media_types, media_match_strict=True, vendor=vendor)
        if not uri:
            # if not found, try without strict media_type matching
            uri, data = self._find_empty_virt_media_slot(
                resources, media_types, media_match_strict=False, vendor=vendor)
        if not uri:
            return {'ret': False,
                    'msg': "Unable to find an available VirtualMedia resource "
                           "%s" % ('supporting ' + str(media_types)
                                   if media_types else '')}

        # confirm InsertMedia action found
        if ('Actions' not in data or
                '#VirtualMedia.InsertMedia' not in data['Actions']):
            # try to insert via PATCH if no InsertMedia action found
            h = headers[uri]
            if 'allow' in h:
                methods = [m.strip() for m in h.get('allow').split(',')]
                if 'PATCH' not in methods:
                    # if Allow header present and PATCH missing, return error
                    return {'ret': False,
                            'msg': "%s action not found and PATCH not allowed"
                            % '#VirtualMedia.InsertMedia'}
            return self.virtual_media_insert_via_patch(options, param_map,
                                                       uri, data)

        # get the action property
        action = data['Actions']['#VirtualMedia.InsertMedia']
        if 'target' not in action:
            return {'ret': False,
                    'msg': "target URI missing from Action "
                           "#VirtualMedia.InsertMedia"}
        action_uri = action['target']
        # get ActionInfo or AllowableValues
        ai = self._get_all_action_info_values(action)
        # construct payload
        payload = self._insert_virt_media_payload(options, param_map, data, ai)
        # POST to action
        response = self.post_request(self.root_uri + action_uri, payload)
        if response['ret'] is False and ('Inserted' in payload or 'WriteProtected' in payload):
            # WORKAROUND
            # Older HPE systems with iLO 4 and Supermicro do not support
            # specifying Inserted or WriteProtected
            vendor = self._get_vendor()['Vendor']
            if vendor == 'HPE' or vendor == 'Supermicro':
                payload.pop('Inserted', None)
                payload.pop('WriteProtected', None)
                response = self.post_request(self.root_uri + action_uri, payload)
        if response['ret'] is False:
            return response
        return {'ret': True, 'changed': True, 'msg': "VirtualMedia inserted"}

    def virtual_media_eject_via_patch(self, uri, image_only=False):
        # construct payload
        payload = {
            'Inserted': False,
            'Image': None
        }

        # Inserted is not writable
        if image_only:
            del payload['Inserted']

        # PATCH resource
        resp = self.patch_request(self.root_uri + uri, payload, check_pyld=True)
        if resp['ret'] is False and 'Inserted' in payload:
            # WORKAROUND
            # Older HPE systems with iLO 4 and Supermicro do not support
            # specifying Inserted
            vendor = self._get_vendor()['Vendor']
            if vendor == 'HPE' or vendor == 'Supermicro':
                payload.pop('Inserted', None)
                resp = self.patch_request(self.root_uri + uri, payload, check_pyld=True)
        if resp['ret'] and resp['changed']:
            resp['msg'] = 'VirtualMedia ejected'
        return resp

    def virtual_media_eject(self, options, resource_type='Manager'):
        image_url = options.get('image_url')
        if not image_url:
            return {'ret': False,
                    'msg': "image_url option required for VirtualMediaEject"}

        # locate and read the VirtualMedia resources
        # Given resource_type, use the proper URI
        if resource_type == 'Systems':
            resource_uri = self.systems_uri
        elif resource_type == 'Manager':
            resource_uri = self.manager_uri
        response = self.get_request(self.root_uri + resource_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'VirtualMedia' not in data:
            return {'ret': False, 'msg': "VirtualMedia resource not found"}

        virt_media_uri = data["VirtualMedia"]["@odata.id"]
        response = self.get_request(self.root_uri + virt_media_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        virt_media_list = []
        for member in data[u'Members']:
            virt_media_list.append(member[u'@odata.id'])
        resources, headers = self._read_virt_media_resources(virt_media_list)

        # find the VirtualMedia resource to eject
        uri, data, eject = self._find_virt_media_to_eject(resources, image_url)
        if uri and eject:
            if ('Actions' not in data or
                    '#VirtualMedia.EjectMedia' not in data['Actions']):
                # try to eject via PATCH if no EjectMedia action found
                h = headers[uri]
                if 'allow' in h:
                    methods = [m.strip() for m in h.get('allow').split(',')]
                    if 'PATCH' not in methods:
                        # if Allow header present and PATCH missing, return error
                        return {'ret': False,
                                'msg': "%s action not found and PATCH not allowed"
                                       % '#VirtualMedia.EjectMedia'}
                return self.virtual_media_eject_via_patch(uri)
            else:
                # POST to the EjectMedia Action
                action = data['Actions']['#VirtualMedia.EjectMedia']
                if 'target' not in action:
                    return {'ret': False,
                            'msg': "target URI property missing from Action "
                                   "#VirtualMedia.EjectMedia"}
                action_uri = action['target']
                # empty payload for Eject action
                payload = {}
                # POST to action
                response = self.post_request(self.root_uri + action_uri,
                                             payload)
                if response['ret'] is False:
                    return response
                return {'ret': True, 'changed': True,
                        'msg': "VirtualMedia ejected"}
        elif uri and not eject:
            # already ejected: return success but changed=False
            return {'ret': True, 'changed': False,
                    'msg': "VirtualMedia image '%s' already ejected" %
                           image_url}
        else:
            # return failure (no resources matching image_url found)
            return {'ret': False, 'changed': False,
                    'msg': "No VirtualMedia resource found with image '%s' "
                           "inserted" % image_url}

    def get_psu_inventory(self):
        result = {}
        psu_list = []
        psu_results = []
        key = "PowerSupplies"
        # Get these entries, but does not fail if not found
        properties = ['Name', 'Model', 'SerialNumber', 'PartNumber', 'Manufacturer',
                      'FirmwareVersion', 'PowerCapacityWatts', 'PowerSupplyType',
                      'Status']

        # Get a list of all Chassis and build URIs, then get all PowerSupplies
        # from each Power entry in the Chassis
        for chassis_uri in self.chassis_uris:
            response = self.get_request(self.root_uri + chassis_uri)
            if response['ret'] is False:
                return response

            result['ret'] = True
            data = response['data']

            if 'Power' in data:
                power_uri = data[u'Power'][u'@odata.id']
            else:
                continue

            response = self.get_request(self.root_uri + power_uri)
            data = response['data']

            if key not in data:
                return {'ret': False, 'msg': "Key %s not found" % key}

            psu_list = data[key]
            for psu in psu_list:
                psu_not_present = False
                psu_data = {}
                for property in properties:
                    if property in psu:
                        if psu[property] is not None:
                            if property == 'Status':
                                if 'State' in psu[property]:
                                    if psu[property]['State'] == 'Absent':
                                        psu_not_present = True
                            psu_data[property] = psu[property]
                if psu_not_present:
                    continue
                psu_results.append(psu_data)

        result["entries"] = psu_results
        if not result["entries"]:
            return {'ret': False, 'msg': "No PowerSupply objects found"}
        return result

    def get_multi_psu_inventory(self):
        return self.aggregate_systems(self.get_psu_inventory)

    def get_system_inventory(self, systems_uri):
        result = {}
        inventory = {}
        # Get these entries, but does not fail if not found
        properties = ['Status', 'HostName', 'PowerState', 'BootProgress', 'Model', 'Manufacturer',
                      'PartNumber', 'SystemType', 'AssetTag', 'ServiceTag',
                      'SerialNumber', 'SKU', 'BiosVersion', 'MemorySummary',
                      'ProcessorSummary', 'TrustedModules', 'Name', 'Id']

        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        for property in properties:
            if property in data:
                inventory[property] = data[property]

        result["entries"] = inventory
        return result

    def get_multi_system_inventory(self):
        return self.aggregate_systems(self.get_system_inventory)

    def get_network_protocols(self):
        result = {}
        service_result = {}
        # Find NetworkProtocol
        response = self.get_request(self.root_uri + self.manager_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'NetworkProtocol' not in data:
            return {'ret': False, 'msg': "NetworkProtocol resource not found"}
        networkprotocol_uri = data["NetworkProtocol"]["@odata.id"]

        response = self.get_request(self.root_uri + networkprotocol_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        protocol_services = ['SNMP', 'VirtualMedia', 'Telnet', 'SSDP', 'IPMI', 'SSH',
                             'KVMIP', 'NTP', 'HTTP', 'HTTPS', 'DHCP', 'DHCPv6', 'RDP',
                             'RFB']
        for protocol_service in protocol_services:
            if protocol_service in data.keys():
                service_result[protocol_service] = data[protocol_service]

        result['ret'] = True
        result["entries"] = service_result
        return result

    def set_network_protocols(self, manager_services):
        # Check input data validity
        protocol_services = ['SNMP', 'VirtualMedia', 'Telnet', 'SSDP', 'IPMI', 'SSH',
                             'KVMIP', 'NTP', 'HTTP', 'HTTPS', 'DHCP', 'DHCPv6', 'RDP',
                             'RFB']
        protocol_state_onlist = ['true', 'True', True, 'on', 1]
        protocol_state_offlist = ['false', 'False', False, 'off', 0]
        payload = {}
        for service_name in manager_services.keys():
            if service_name not in protocol_services:
                return {'ret': False, 'msg': "Service name %s is invalid" % service_name}
            payload[service_name] = {}
            for service_property in manager_services[service_name].keys():
                value = manager_services[service_name][service_property]
                if service_property in ['ProtocolEnabled', 'protocolenabled']:
                    if value in protocol_state_onlist:
                        payload[service_name]['ProtocolEnabled'] = True
                    elif value in protocol_state_offlist:
                        payload[service_name]['ProtocolEnabled'] = False
                    else:
                        return {'ret': False, 'msg': "Value of property %s is invalid" % service_property}
                elif service_property in ['port', 'Port']:
                    if isinstance(value, int):
                        payload[service_name]['Port'] = value
                    elif isinstance(value, str) and value.isdigit():
                        payload[service_name]['Port'] = int(value)
                    else:
                        return {'ret': False, 'msg': "Value of property %s is invalid" % service_property}
                else:
                    payload[service_name][service_property] = value

        # Find the ManagerNetworkProtocol resource
        response = self.get_request(self.root_uri + self.manager_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        networkprotocol_uri = data.get("NetworkProtocol", {}).get("@odata.id")
        if networkprotocol_uri is None:
            return {'ret': False, 'msg': "NetworkProtocol resource not found"}

        # Modify the ManagerNetworkProtocol resource
        resp = self.patch_request(self.root_uri + networkprotocol_uri, payload, check_pyld=True)
        if resp['ret'] and resp['changed']:
            resp['msg'] = 'Modified manager network protocol settings'
        return resp

    @staticmethod
    def to_singular(resource_name):
        if resource_name.endswith('ies'):
            resource_name = resource_name[:-3] + 'y'
        elif resource_name.endswith('s'):
            resource_name = resource_name[:-1]
        return resource_name

    def get_health_resource(self, subsystem, uri, health, expanded):
        status = 'Status'

        if expanded:
            d = expanded
        else:
            r = self.get_request(self.root_uri + uri)
            if r.get('ret'):
                d = r.get('data')
            else:
                return

        if 'Members' in d:  # collections case
            for m in d.get('Members'):
                u = m.get('@odata.id')
                r = self.get_request(self.root_uri + u)
                if r.get('ret'):
                    p = r.get('data')
                    if p:
                        e = {self.to_singular(subsystem.lower()) + '_uri': u,
                             status: p.get(status,
                                           "Status not available")}
                        health[subsystem].append(e)
        else:  # non-collections case
            e = {self.to_singular(subsystem.lower()) + '_uri': uri,
                 status: d.get(status,
                               "Status not available")}
            health[subsystem].append(e)

    def get_health_subsystem(self, subsystem, data, health):
        if subsystem in data:
            sub = data.get(subsystem)
            if isinstance(sub, list):
                for r in sub:
                    if '@odata.id' in r:
                        uri = r.get('@odata.id')
                        expanded = None
                        if '#' in uri and len(r) > 1:
                            expanded = r
                        self.get_health_resource(subsystem, uri, health, expanded)
            elif isinstance(sub, dict):
                if '@odata.id' in sub:
                    uri = sub.get('@odata.id')
                    self.get_health_resource(subsystem, uri, health, None)
        elif 'Members' in data:
            for m in data.get('Members'):
                u = m.get('@odata.id')
                r = self.get_request(self.root_uri + u)
                if r.get('ret'):
                    d = r.get('data')
                    self.get_health_subsystem(subsystem, d, health)

    def get_health_report(self, category, uri, subsystems):
        result = {}
        health = {}
        status = 'Status'

        # Get health status of top level resource
        response = self.get_request(self.root_uri + uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']
        health[category] = {status: data.get(status, "Status not available")}

        # Get health status of subsystems
        for sub in subsystems:
            d = None
            if sub.startswith('Links.'):  # ex: Links.PCIeDevices
                sub = sub[len('Links.'):]
                d = data.get('Links', {})
            elif '.' in sub:  # ex: Thermal.Fans
                p, sub = sub.split('.')
                u = data.get(p, {}).get('@odata.id')
                if u:
                    r = self.get_request(self.root_uri + u)
                    if r['ret']:
                        d = r['data']
                if not d:
                    continue
            else:  # ex: Memory
                d = data
            health[sub] = []
            self.get_health_subsystem(sub, d, health)
            if not health[sub]:
                del health[sub]

        result["entries"] = health
        return result

    def get_system_health_report(self, systems_uri):
        subsystems = ['Processors', 'Memory', 'SimpleStorage', 'Storage',
                      'EthernetInterfaces', 'NetworkInterfaces.NetworkPorts',
                      'NetworkInterfaces.NetworkDeviceFunctions']
        return self.get_health_report('System', systems_uri, subsystems)

    def get_multi_system_health_report(self):
        return self.aggregate_systems(self.get_system_health_report)

    def get_chassis_health_report(self, chassis_uri):
        subsystems = ['Power.PowerSupplies', 'Thermal.Fans',
                      'Links.PCIeDevices']
        return self.get_health_report('Chassis', chassis_uri, subsystems)

    def get_multi_chassis_health_report(self):
        return self.aggregate_chassis(self.get_chassis_health_report)

    def get_manager_health_report(self, manager_uri):
        subsystems = []
        return self.get_health_report('Manager', manager_uri, subsystems)

    def get_multi_manager_health_report(self):
        return self.aggregate_managers(self.get_manager_health_report)

    def set_manager_nic(self, nic_addr, nic_config):
        # Get the manager ethernet interface uri
        nic_info = self.get_manager_ethernet_uri(nic_addr)

        if nic_info.get('nic_addr') is None:
            return nic_info
        else:
            target_ethernet_uri = nic_info['nic_addr']
            target_ethernet_current_setting = nic_info['ethernet_setting']

        # Convert input to payload and check validity
        # Note: Some properties in the EthernetInterface resource are arrays of
        # objects.  The call into this module expects a flattened view, meaning
        # the user specifies exactly one object for an array property.  For
        # example, if a user provides IPv4StaticAddresses in the request to this
        # module, it will turn that into an array of one member.  This pattern
        # should be avoided for future commands in this module, but needs to be
        # preserved here for backwards compatibility.
        payload = {}
        for property in nic_config.keys():
            value = nic_config[property]
            if property in target_ethernet_current_setting and isinstance(value, dict) and isinstance(target_ethernet_current_setting[property], list):
                payload[property] = list()
                payload[property].append(value)
            else:
                payload[property] = value

        # Modify the EthernetInterface resource
        resp = self.patch_request(self.root_uri + target_ethernet_uri, payload, check_pyld=True)
        if resp['ret'] and resp['changed']:
            resp['msg'] = 'Modified manager NIC'
        return resp

    # A helper function to get the EthernetInterface URI
    def get_manager_ethernet_uri(self, nic_addr='null'):
        # Get EthernetInterface collection
        response = self.get_request(self.root_uri + self.manager_uri)
        if not response['ret']:
            return response
        data = response['data']
        if 'EthernetInterfaces' not in data:
            return {'ret': False, 'msg': "EthernetInterfaces resource not found"}
        ethernetinterfaces_uri = data["EthernetInterfaces"]["@odata.id"]
        response = self.get_request(self.root_uri + ethernetinterfaces_uri)
        if not response['ret']:
            return response
        data = response['data']
        uris = [a.get('@odata.id') for a in data.get('Members', []) if
                a.get('@odata.id')]

        # Find target EthernetInterface
        target_ethernet_uri = None
        target_ethernet_current_setting = None
        if nic_addr == 'null':
            # Find root_uri matched EthernetInterface when nic_addr is not specified
            nic_addr = (self.root_uri).split('/')[-1]
            nic_addr = nic_addr.split(':')[0]  # split port if existing
        for uri in uris:
            response = self.get_request(self.root_uri + uri)
            if not response['ret']:
                return response
            data = response['data']
            data_string = json.dumps(data)
            if nic_addr.lower() in data_string.lower():
                target_ethernet_uri = uri
                target_ethernet_current_setting = data
                break

        nic_info = {}
        nic_info['nic_addr'] = target_ethernet_uri
        nic_info['ethernet_setting'] = target_ethernet_current_setting

        if target_ethernet_uri is None:
            return {}
        else:
            return nic_info

    def set_hostinterface_attributes(self, hostinterface_config, hostinterface_id=None):
        if hostinterface_config is None:
            return {'ret': False, 'msg':
                    'Must provide hostinterface_config for SetHostInterface command'}

        # Find the HostInterfaceCollection resource
        response = self.get_request(self.root_uri + self.manager_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        hostinterfaces_uri = data.get("HostInterfaces", {}).get("@odata.id")
        if hostinterfaces_uri is None:
            return {'ret': False, 'msg': "HostInterface resource not found"}
        response = self.get_request(self.root_uri + hostinterfaces_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        uris = [a.get('@odata.id') for a in data.get('Members', []) if a.get('@odata.id')]

        # Capture list of URIs that match a specified HostInterface resource Id
        if hostinterface_id:
            matching_hostinterface_uris = [uri for uri in uris if hostinterface_id in uri.split('/')[-1]]
        if hostinterface_id and matching_hostinterface_uris:
            hostinterface_uri = list.pop(matching_hostinterface_uris)
        elif hostinterface_id and not matching_hostinterface_uris:
            return {'ret': False, 'msg': "HostInterface ID %s not present." % hostinterface_id}
        elif len(uris) == 1:
            hostinterface_uri = list.pop(uris)
        else:
            return {'ret': False, 'msg': "HostInterface ID not defined and multiple interfaces detected."}

        # Modify the HostInterface resource
        resp = self.patch_request(self.root_uri + hostinterface_uri, hostinterface_config, check_pyld=True)
        if resp['ret'] and resp['changed']:
            resp['msg'] = 'Modified host interface'
        return resp

    def get_hostinterfaces(self):
        result = {}
        hostinterface_results = []
        properties = ['Id', 'Name', 'Description', 'HostInterfaceType', 'Status',
                      'InterfaceEnabled', 'ExternallyAccessible', 'AuthenticationModes',
                      'AuthNoneRoleId', 'CredentialBootstrapping']
        manager_uri_list = self.manager_uris
        for manager_uri in manager_uri_list:
            response = self.get_request(self.root_uri + manager_uri)
            if response['ret'] is False:
                return response

            result['ret'] = True
            data = response['data']
            hostinterfaces_uri = data.get("HostInterfaces", {}).get("@odata.id")
            if hostinterfaces_uri is None:
                continue

            response = self.get_request(self.root_uri + hostinterfaces_uri)
            data = response['data']

            if 'Members' in data:
                for hostinterface in data['Members']:
                    hostinterface_uri = hostinterface['@odata.id']
                    hostinterface_response = self.get_request(self.root_uri + hostinterface_uri)
                    # dictionary for capturing individual HostInterface properties
                    hostinterface_data_temp = {}
                    if hostinterface_response['ret'] is False:
                        return hostinterface_response
                    hostinterface_data = hostinterface_response['data']
                    for property in properties:
                        if property in hostinterface_data:
                            if hostinterface_data[property] is not None:
                                hostinterface_data_temp[property] = hostinterface_data[property]
                    # Check for the presence of a ManagerEthernetInterface
                    # object, a link to a _single_ EthernetInterface that the
                    # BMC uses to communicate with the host.
                    if 'ManagerEthernetInterface' in hostinterface_data:
                        interface_uri = hostinterface_data['ManagerEthernetInterface']['@odata.id']
                        interface_response = self.get_nic(interface_uri)
                        if interface_response['ret'] is False:
                            return interface_response
                        hostinterface_data_temp['ManagerEthernetInterface'] = interface_response['entries']

                    # Check for the presence of a HostEthernetInterfaces
                    # object, a link to a _collection_ of EthernetInterfaces
                    # that the host uses to communicate with the BMC.
                    if 'HostEthernetInterfaces' in hostinterface_data:
                        interfaces_uri = hostinterface_data['HostEthernetInterfaces']['@odata.id']
                        interfaces_response = self.get_request(self.root_uri + interfaces_uri)
                        if interfaces_response['ret'] is False:
                            return interfaces_response
                        interfaces_data = interfaces_response['data']
                        if 'Members' in interfaces_data:
                            for interface in interfaces_data['Members']:
                                interface_uri = interface['@odata.id']
                                interface_response = self.get_nic(interface_uri)
                                if interface_response['ret'] is False:
                                    return interface_response
                                # Check if this is the first
                                # HostEthernetInterfaces item and create empty
                                # list if so.
                                if 'HostEthernetInterfaces' not in hostinterface_data_temp:
                                    hostinterface_data_temp['HostEthernetInterfaces'] = []

                                hostinterface_data_temp['HostEthernetInterfaces'].append(interface_response['entries'])

                    hostinterface_results.append(hostinterface_data_temp)
            else:
                continue
        result["entries"] = hostinterface_results
        if not result["entries"]:
            return {'ret': False, 'msg': "No HostInterface objects found"}
        return result

    def get_manager_inventory(self, manager_uri):
        result = {}
        inventory = {}
        # Get these entries, but does not fail if not found
        properties = ['Id', 'FirmwareVersion', 'ManagerType', 'Manufacturer', 'Model',
                      'PartNumber', 'PowerState', 'SerialNumber', 'ServiceIdentification',
                      'Status', 'UUID']

        response = self.get_request(self.root_uri + manager_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']

        for property in properties:
            if property in data:
                inventory[property] = data[property]

        result["entries"] = inventory
        return result

    def get_multi_manager_inventory(self):
        return self.aggregate_managers(self.get_manager_inventory)

    def get_service_identification(self, manager):
        result = {}
        if manager is None:
            if len(self.manager_uris) == 1:
                manager = self.manager_uris[0].split('/')[-1]
            elif len(self.manager_uris) > 1:
                entries = self.get_multi_manager_inventory()['entries']
                managers = [m[0]['manager_uri'] for m in entries if m[1].get('ServiceIdentification')]
                if len(managers) == 1:
                    manager = managers[0].split('/')[-1]
                else:
                    self.module.fail_json(msg=[
                        "Multiple managers with ServiceIdentification were found: %s" % str(managers),
                        "Please specify by using the 'manager' parameter in your playbook"])
            elif len(self.manager_uris) == 0:
                self.module.fail_json(msg="No manager identities were found")
        response = self.get_request(self.root_uri + '/redfish/v1/Managers/' + manager, override_headers=None)
        try:
            result['service_identification'] = response['data']['ServiceIdentification']
        except Exception as e:
            self.module.fail_json(msg="Service ID not found for manager %s" % manager)
        result['ret'] = True
        return result

    def set_service_identification(self, service_id):
        data = {"ServiceIdentification": service_id}
        resp = self.patch_request(self.root_uri + '/redfish/v1/Managers/' + self.resource_id, data, check_pyld=True)
        return resp

    def set_session_service(self, sessions_config):
        if sessions_config is None:
            return {'ret': False, 'msg':
                    'Must provide sessions_config for SetSessionService command'}

        resp = self.patch_request(self.root_uri + self.session_service_uri, sessions_config, check_pyld=True)
        if resp['ret'] and resp['changed']:
            resp['msg'] = 'Modified session service'
        return resp

    def verify_bios_attributes(self, bios_attributes):
        # This method verifies BIOS attributes against the provided input
        server_bios = self.get_multi_bios_attributes()
        if server_bios["ret"] is False:
            return server_bios

        bios_dict = {}
        wrong_param = {}

        # Verify bios_attributes with BIOS settings available in the server
        for key, value in bios_attributes.items():
            if key in server_bios["entries"][0][1]:
                if server_bios["entries"][0][1][key] != value:
                    bios_dict.update({key: value})
            else:
                wrong_param.update({key: value})

        if wrong_param:
            return {
                "ret": False,
                "msg": "Wrong parameters are provided: %s" % wrong_param
            }

        if bios_dict:
            return {
                "ret": False,
                "msg": "BIOS parameters are not matching: %s" % bios_dict
            }

        return {
            "ret": True,
            "changed": False,
            "msg": "BIOS verification completed"
        }

    def enable_secure_boot(self):
        # This function enable Secure Boot on an OOB controller

        response = self.get_request(self.root_uri + self.systems_uri)
        if response["ret"] is False:
            return response

        server_details = response["data"]
        secure_boot_url = server_details["SecureBoot"]["@odata.id"]

        response = self.get_request(self.root_uri + secure_boot_url)
        if response["ret"] is False:
            return response

        body = {}
        body["SecureBootEnable"] = True

        return self.patch_request(self.root_uri + secure_boot_url, body, check_pyld=True)

    def set_secure_boot(self, secure_boot_enable):
        # This function enable Secure Boot on an OOB controller

        response = self.get_request(self.root_uri + self.systems_uri)
        if response["ret"] is False:
            return response

        server_details = response["data"]
        secure_boot_url = server_details["SecureBoot"]["@odata.id"]

        response = self.get_request(self.root_uri + secure_boot_url)
        if response["ret"] is False:
            return response

        body = {}
        body["SecureBootEnable"] = secure_boot_enable

        return self.patch_request(self.root_uri + secure_boot_url, body, check_pyld=True)

    def get_hpe_thermal_config(self):
        result = {}
        key = "Thermal"
        # Go through list
        for chassis_uri in self.chassis_uris:
            response = self.get_request(self.root_uri + chassis_uri)
            if response['ret'] is False:
                return response
            result['ret'] = True
            data = response['data']
            val = data.get('Oem', {}).get('Hpe', {}).get('ThermalConfiguration')
            if val is not None:
                return {"ret": True, "current_thermal_config": val}
        return {"ret": False}

    def get_hpe_fan_percent_min(self):
        result = {}
        key = "Thermal"
        # Go through list
        for chassis_uri in self.chassis_uris:
            response = self.get_request(self.root_uri + chassis_uri)
            if response['ret'] is False:
                return response
            data = response['data']
            val = data.get('Oem', {}).get('Hpe', {}).get('FanPercentMinimum')
            if val is not None:
                return {"ret": True, "fan_percent_min": val}
        return {"ret": False}

    def delete_volumes(self, storage_subsystem_id, volume_ids):
        # Find the Storage resource from the requested ComputerSystem resource
        response = self.get_request(self.root_uri + self.systems_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        storage_uri = data.get('Storage', {}).get('@odata.id')
        if storage_uri is None:
            return {'ret': False, 'msg': 'Storage resource not found'}

        # Get Storage Collection
        response = self.get_request(self.root_uri + storage_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        # Collect Storage Subsystems
        self.storage_subsystems_uris = [i['@odata.id'] for i in response['data'].get('Members', [])]
        if not self.storage_subsystems_uris:
            return {
                'ret': False,
                'msg': "StorageCollection's Members array is either empty or missing"}

        # Matching Storage Subsystem ID with user input
        self.storage_subsystem_uri = ""
        for storage_subsystem_uri in self.storage_subsystems_uris:
            if storage_subsystem_uri.split("/")[-2] == storage_subsystem_id:
                self.storage_subsystem_uri = storage_subsystem_uri

        if not self.storage_subsystem_uri:
            return {
                'ret': False,
                'msg': "Provided Storage Subsystem ID %s does not exist on the server" % storage_subsystem_id}

        # Get Volume Collection
        response = self.get_request(self.root_uri + self.storage_subsystem_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        response = self.get_request(self.root_uri + data['Volumes']['@odata.id'])
        if response['ret'] is False:
            return response
        data = response['data']

        # Collect Volumes
        self.volume_uris = [i['@odata.id'] for i in response['data'].get('Members', [])]
        if not self.volume_uris:
            return {
                'ret': True, 'changed': False,
                'msg': "VolumeCollection's Members array is either empty or missing"}

        # Delete each volume
        for volume in self.volume_uris:
            if volume.split("/")[-1] in volume_ids:
                response = self.delete_request(self.root_uri + volume)
                if response['ret'] is False:
                    return response

        return {'ret': True, 'changed': True,
                'msg': "The following volumes were deleted: %s" % str(volume_ids)}

    def create_volume(self, volume_details, storage_subsystem_id):
        # Find the Storage resource from the requested ComputerSystem resource
        response = self.get_request(self.root_uri + self.systems_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        storage_uri = data.get('Storage', {}).get('@odata.id')
        if storage_uri is None:
            return {'ret': False, 'msg': 'Storage resource not found'}

        # Get Storage Collection
        response = self.get_request(self.root_uri + storage_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        # Collect Storage Subsystems
        self.storage_subsystems_uris = [i['@odata.id'] for i in response['data'].get('Members', [])]
        if not self.storage_subsystems_uris:
            return {
                'ret': False,
                'msg': "StorageCollection's Members array is either empty or missing"}

        # Matching Storage Subsystem ID with user input
        self.storage_subsystem_uri = ""
        for storage_subsystem_uri in self.storage_subsystems_uris:
            if storage_subsystem_uri.split("/")[-2] == storage_subsystem_id:
                self.storage_subsystem_uri = storage_subsystem_uri

        if not self.storage_subsystem_uri:
            return {
                'ret': False,
                'msg': "Provided Storage Subsystem ID %s does not exist on the server" % storage_subsystem_id}

        # Validate input parameters
        required_parameters = ['RAIDType', 'Drives', 'CapacityBytes']
        allowed_parameters = ['DisplayName', 'InitializeMethod', 'MediaSpanCount',
                              'Name', 'ReadCachePolicy', 'StripSizeBytes', 'VolumeUsage', 'WriteCachePolicy']

        for parameter in required_parameters:
            if not volume_details.get(parameter):
                return {
                    'ret': False,
                    'msg': "%s are required parameter to create a volume" % str(required_parameters)}

        # Navigate to the volume uri of the correct storage subsystem
        response = self.get_request(self.root_uri + self.storage_subsystem_uri)
        if response['ret'] is False:
            return response
        data = response['data']

        # Deleting any volumes of RAIDType None present on the Storage Subsystem
        response = self.get_request(self.root_uri + data['Volumes']['@odata.id'])
        if response['ret'] is False:
            return response
        volume_data = response['data']

        if "Members" in volume_data:
            for member in volume_data["Members"]:
                response = self.get_request(self.root_uri + member['@odata.id'])
                if response['ret'] is False:
                    return response
                member_data = response['data']

                if member_data["RAIDType"] == "None":
                    response = self.delete_request(self.root_uri + member['@odata.id'])
                    if response['ret'] is False:
                        return response

        # Construct payload and issue POST command to create volume
        volume_details["Links"] = {}
        volume_details["Links"]["Drives"] = []
        for drive in volume_details["Drives"]:
            volume_details["Links"]["Drives"].append({"@odata.id": drive})
        del volume_details["Drives"]
        payload = volume_details
        response = self.post_request(self.root_uri + data['Volumes']['@odata.id'], payload)
        if response['ret'] is False:
            return response

        return {'ret': True, 'changed': True,
                'msg': "Volume Created"}

    def get_bios_registries(self):
        # Get /redfish/v1
        response = self.get_request(self.root_uri + self.systems_uri)
        if not response["ret"]:
            return response

        server_details = response["data"]

        # Get Registries URI
        if "Bios" not in server_details:
            msg = "Getting BIOS URI failed, Key 'Bios' not found in /redfish/v1/Systems/1/ response: %s"
            return {
                "ret": False,
                "msg": msg % str(server_details)
            }

        bios_uri = server_details["Bios"]["@odata.id"]
        bios_resp = self.get_request(self.root_uri + bios_uri)
        if not bios_resp["ret"]:
            return bios_resp

        bios_data = bios_resp["data"]
        attribute_registry = bios_data["AttributeRegistry"]

        reg_uri = self.root_uri + self.service_root + "Registries/" + attribute_registry
        reg_resp = self.get_request(reg_uri)
        if not reg_resp["ret"]:
            return reg_resp

        reg_data = reg_resp["data"]

        # Get BIOS attribute registry URI
        lst = []

        # Get the location URI
        response = self.check_location_uri(reg_data, reg_uri)
        if not response["ret"]:
            return response

        rsp_data, rsp_uri = response["rsp_data"], response["rsp_uri"]

        if "RegistryEntries" not in rsp_data:
            return {
                "msg": "'RegistryEntries' not present in %s response, %s" % (rsp_uri, str(rsp_data)),
                "ret": False
            }

        return {
            "bios_registry": rsp_data,
            "bios_registry_uri": rsp_uri,
            "ret": True
        }

    def check_location_uri(self, resp_data, resp_uri):
        # Get the location URI response
        # return {"msg": self.creds, "ret": False}
        vendor = self._get_vendor()['Vendor']
        rsp_uri = ""
        for loc in resp_data['Location']:
            if loc['Language'].startswith("en"):
                rsp_uri = loc['Uri']
                if vendor == 'HPE':
                    # WORKAROUND
                    # HPE systems with iLO 4 will have BIOS Attribute Registries location URI as a dictionary with key 'extref'
                    # Hence adding condition to fetch the Uri
                    if isinstance(loc['Uri'], dict) and "extref" in loc['Uri'].keys():
                        rsp_uri = loc['Uri']['extref']
        if not rsp_uri:
            msg = "Language 'en' not found in BIOS Attribute Registries location, URI: %s, response: %s"
            return {
                "ret": False,
                "msg": msg % (resp_uri, str(resp_data))
            }

        res = self.get_request(self.root_uri + rsp_uri)
        if res['ret'] is False:
            # WORKAROUND
            # HPE systems with iLO 4 or iLO5 compresses (gzip) for some URIs
            # Hence adding encoding to the header
            if vendor == 'HPE':
                override_headers = {"Accept-Encoding": "gzip"}
                res = self.get_request(self.root_uri + rsp_uri, override_headers=override_headers)
        if res['ret']:
            return {
                "ret": True,
                "rsp_data": res["data"],
                "rsp_uri": rsp_uri
            }
        return res