get latest release automatically

lib/index.js

@@ -20,7 +20,7 @@ const installer = __importStar(require("./installer"));
 function run() {
     return __awaiter(this, void 0, void 0, function* () {
         try {
-            const version = core.getInput('version', { required: true });
+            const version = core.getInput('version', { required: false }) || '';
             const channel = core.getInput('channel', { required: false }) || 'stable';
             yield installer.getFlutter(version, channel);
         }

lib/installer.js

@@ -23,11 +23,13 @@ const io = __importStar(require("@actions/io"));
 const tc = __importStar(require("@actions/tool-cache"));
 const fs = __importStar(require("fs"));
 const path = __importStar(require("path"));
+const restm = __importStar(require("typed-rest-client/RestClient"));
 const v4_1 = __importDefault(require("uuid/v4"));
 const exec_1 = require("@actions/exec/lib/exec");
 const IS_WINDOWS = process.platform === 'win32';
 const IS_DARWIN = process.platform === 'darwin';
 const IS_LINUX = process.platform === 'linux';
+const storageUrl = 'https://storage.googleapis.com/flutter_infra/releases';
 let tempDirectory = process.env['RUNNER_TEMP'] || '';
 if (!tempDirectory) {
     let baseLocation;
@@ -46,9 +48,8 @@ if (!tempDirectory) {
 }
 function getFlutter(version, channel) {
     return __awaiter(this, void 0, void 0, function* () {
-        // make semver compatible, eg: 1.7.8+hotfix.4 -> 1.7.8-hotfix.4
-        const semver = version.replace('+', '-');
-        const cleanver = `${semver}-${channel}`;
+        version = yield determineVersion(version, channel);
+        let cleanver = `${version.replace('+', '-')}-${channel}`;
         let toolPath = tc.find('flutter', cleanver);
         if (toolPath) {
             core.debug(`Tool found in cache ${toolPath}`);
@@ -82,7 +83,7 @@ function extName() {
 function getDownloadInfo(version, channel) {
     const os = osName();
     const ext = extName();
-    const url = `https://storage.googleapis.com/flutter_infra/releases/${channel}/${os}/flutter_${os}_v${version}-${channel}.${ext}`;
+    const url = `${storageUrl}/${channel}/${os}/flutter_${os}_v${version}-${channel}.${ext}`;
     return {
         version,
         url
@@ -162,3 +163,29 @@ function extractZipDarwin(file, dest) {
         yield exec_1.exec(`"${unzipPath}"`, [file], { cwd: dest });
     });
 }
+function determineVersion(version, channel) {
+    return __awaiter(this, void 0, void 0, function* () {
+        if (version.endsWith('.x') || version === '') {
+            return yield getLatestVersion(version, channel);
+        }
+        return version;
+    });
+}
+function getLatestVersion(version, channel) {
+    return __awaiter(this, void 0, void 0, function* () {
+        const releasesUrl = `${storageUrl}/releases_${osName()}.json`;
+        const rest = new restm.RestClient('setup-go');
+        const storage = (yield rest.get(releasesUrl)).result;
+        if (!storage) {
+            throw new Error('unable to get latest version');
+        }
+        const channelVersion = storage.releases.find(release => release.hash === storage.current_release[channel]);
+        if (!channelVersion) {
+            throw new Error(`unable to get latest version from channel ${channel}`);
+        }
+        let cver = channelVersion.version;
+        cver = cver.slice(1, cver.length);
+        core.debug(`latest version from channel ${channel} is ${cver}`);
+        return cver;
+    });
+}

src/index.ts

@@ -3,7 +3,7 @@ import * as installer from './installer';
 
 async function run() {
   try {
-    const version = core.getInput('version', {required: true});
+    const version = core.getInput('version', {required: false}) || '';
     const channel = core.getInput('channel', {required: false}) || 'stable';
 
     await installer.getFlutter(version, channel);

src/installer.ts

@@ -3,6 +3,7 @@ import * as io from '@actions/io';
 import * as tc from '@actions/tool-cache';
 import * as fs from 'fs';
 import * as path from 'path';
+import * as restm from 'typed-rest-client/RestClient';
 import uuidV4 from 'uuid/v4';
 import {exec} from '@actions/exec/lib/exec';
 
@@ -10,6 +11,8 @@ const IS_WINDOWS = process.platform === 'win32';
 const IS_DARWIN = process.platform === 'darwin';
 const IS_LINUX = process.platform === 'linux';
 
+const storageUrl = 'https://storage.googleapis.com/flutter_infra/releases';
+
 let tempDirectory = process.env['RUNNER_TEMP'] || '';
 
 if (!tempDirectory) {
@@ -32,9 +35,9 @@ export async function getFlutter(
   version: string,
   channel: string
 ): Promise<void> {
-  // make semver compatible, eg: 1.7.8+hotfix.4 -> 1.7.8-hotfix.4
-  const semver = version.replace('+', '-');
-  const cleanver = `${semver}-${channel}`;
+  version = await determineVersion(version, channel);
+
+  let cleanver = `${version.replace('+', '-')}-${channel}`;
   let toolPath = tc.find('flutter', cleanver);
 
   if (toolPath) {
@@ -75,7 +78,7 @@ function getDownloadInfo(
 ): {version: string; url: string} {
   const os = osName();
   const ext = extName();
-  const url = `https://storage.googleapis.com/flutter_infra/releases/${channel}/${os}/flutter_${os}_v${version}-${channel}.${ext}`;
+  const url = `${storageUrl}/${channel}/${os}/flutter_${os}_v${version}-${channel}.${ext}`;
 
   return {
     version,
@@ -171,3 +174,61 @@ async function extractZipDarwin(file: string, dest: string): Promise<void> {
   );
   await exec(`"${unzipPath}"`, [file], {cwd: dest});
 }
+
+async function determineVersion(
+  version: string,
+  channel: string
+): Promise<string> {
+  if (version.endsWith('.x') || version === '') {
+    return await getLatestVersion(version, channel);
+  }
+
+  return version;
+}
+
+interface IFlutterChannel {
+  [key: string]: string;
+  beta: string;
+  dev: string;
+  stable: string;
+}
+
+interface IFlutterRelease {
+  hash: string;
+  channel: string;
+  version: string;
+}
+
+interface IFlutterStorage {
+  current_release: IFlutterChannel;
+  releases: IFlutterRelease[];
+}
+
+async function getLatestVersion(
+  version: string,
+  channel: string
+): Promise<string> {
+  const releasesUrl: string = `${storageUrl}/releases_${osName()}.json`;
+  const rest: restm.RestClient = new restm.RestClient('setup-go');
+  const storage: IFlutterStorage | null = (await rest.get<IFlutterStorage | null>(
+    releasesUrl
+  )).result;
+
+  if (!storage) {
+    throw new Error('unable to get latest version');
+  }
+
+  const channelVersion = storage.releases.find(
+    release => release.hash === storage.current_release[channel]
+  );
+
+  if (!channelVersion) {
+    throw new Error(`unable to get latest version from channel ${channel}`);
+  }
+
+  let cver = channelVersion.version;
+  cver = cver.slice(1, cver.length);
+
+  core.debug(`latest version from channel ${channel} is ${cver}`);
+  return cver;
+}