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Merge pull request #14293 from dagwieers/fix-eval-json-booleans

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Defined JSON booleans in global context for python eval()
This commit is contained in:
Brian Coca 2016-02-04 11:33:30 -05:00
commit 6149685652
1 changed files with 9 additions and 1 deletions
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10
lib/ansible/template/safe_eval.py
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@ -41,6 +41,14 @@ def safe_eval(expr, locals={}, include_exceptions=False):
http://stackoverflow.com/questions/12523516/using-ast-and-whitelists-to-make-pythons-eval-safe http://stackoverflow.com/questions/12523516/using-ast-and-whitelists-to-make-pythons-eval-safe
''' '''
# define certain JSON types
# eg. JSON booleans are unknown to python eval()
JSON_TYPES = {
'false': False,
'null': None,
'true': True,
}
# this is the whitelist of AST nodes we are going to # this is the whitelist of AST nodes we are going to
# allow in the evaluation. Any node type other than # allow in the evaluation. Any node type other than
# those listed here will raise an exception in our custom # those listed here will raise an exception in our custom
@ -116,7 +124,7 @@ def safe_eval(expr, locals={}, include_exceptions=False):
parsed_tree = ast.parse(expr, mode='eval') parsed_tree = ast.parse(expr, mode='eval')
cnv.visit(parsed_tree) cnv.visit(parsed_tree)
compiled = compile(parsed_tree, expr, 'eval') compiled = compile(parsed_tree, expr, 'eval')
result = eval(compiled, {}, dict(locals)) result = eval(compiled, JSON_TYPES, dict(locals))
if include_exceptions: if include_exceptions:
return (result, None) return (result, None)