Added Azure Func Tools Installer task.

Tasks/Common/func-tools-common/functoolsutility.ts

@@ -0,0 +1,78 @@
+"use strict";
+
+import * as fs from 'fs';
+import * as os from 'os';
+import * as util from 'util';
+import * as tl from "azure-pipelines-task-lib/task";
+import * as toolLib from 'azure-pipelines-tool-lib/tool';
+import * as path from "path";
+
+const funcToolName = 'func';
+
+function getExecutableExtension(): string {
+    if (os.type().match(/^Win/)) {
+        return '.exe';
+    }
+
+    return '';
+}
+
+function getDownloadUrl(version: string) {
+    let downloadUrlFormat = 'https://github.com/Azure/azure-functions-core-tools/releases/download/%s/Azure.Functions.Cli.%s.%s.zip';
+    switch (os.type()) {
+        case 'Linux':
+            return util.format(downloadUrlFormat, version, 'linux-x64', version);
+
+        case 'Darwin':
+            return util.format(downloadUrlFormat, version, 'osx-x64', version);
+
+        case 'Windows_NT':
+        default:
+            return util.format(downloadUrlFormat, version, 'win-x86', version);
+
+    }
+}
+
+export async function getLatestFuncToolsVersion(): Promise<string> {
+    const funcToolsLatestReleaseUrl = 'https://api.github.com/repos/Azure/azure-functions-core-tools/releases/latest';
+    const stableFuncToolsVersion = '2.7.1585';
+    let latestVersion = stableFuncToolsVersion;
+
+    try {
+        const downloadPath = await toolLib.downloadTool(funcToolsLatestReleaseUrl);
+        const response = JSON.parse(fs.readFileSync(downloadPath, 'utf8').toString().trim());
+        if (response.tag_name) {
+            latestVersion = response.tag_name;
+        }
+    } catch (error) {
+        tl.warning(tl.loc('ErrorFetchingLatestVersion', funcToolsLatestReleaseUrl, error, stableFuncToolsVersion));
+    }
+
+    return latestVersion;
+}
+
+export async function downloadFuncTools(version: string): Promise<string> {
+        let cachedToolpath = toolLib.findLocalTool(funcToolName, version);
+
+        if (!cachedToolpath) {
+            const downloadUrl = getDownloadUrl(version);
+            let downloadPath;
+            try {
+                downloadPath = await toolLib.downloadTool(downloadUrl);
+            }
+            catch (ex) {
+                throw new Error(tl.loc('FuncDownloadFailed', downloadUrl, ex));
+            }
+
+            tl.debug('Extracting the downloaded func tool zip..');
+            const unzippedFuncPath = await toolLib.extractZip(downloadPath);
+            cachedToolpath = await toolLib.cacheDir(unzippedFuncPath, funcToolName, version);
+            console.log(tl.loc("SuccessfullyDownloaded", version, cachedToolpath));
+        } else {
+            console.log(tl.loc("VersionAlreadyInstalled", version, cachedToolpath));
+        }
+
+        const funcPath = path.join(cachedToolpath, funcToolName + getExecutableExtension());
+        fs.chmodSync(funcPath, '777');
+        return funcPath;
+}

Tasks/Common/func-tools-common/package.json

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+{
+  "name": "func-tools-common",
+  "version": "1.0.0",
+  "description": "Common Library for Azure func tools",
+  "repository": {
+    "type": "git",
+    "url": "git+ssh://[email protected]/Microsoft/azure-pipelines-tasks.git"
+  },
+  "author": "Microsoft Corporation",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/Microsoft/azure-pipelines-tasks/issues"
+  },
+  "homepage": "https://github.com/Microsoft/azure-pipelines-tasks#readme",
+  "dependencies": {
+    "azure-pipelines-task-lib": "2.8.0",
+    "azure-pipelines-tool-lib": "0.12.0"
+  }
+}

Tasks/Common/func-tools-common/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "declaration": true,
+        "noImplicitAny": false,
+        "sourceMap": false
+    }
+}

Tasks/Common/func-tools-common/typings.json

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+{
+    "globalDependencies": {
+        "node": "registry:dt/node#6.0.0+20160920093002"
+    }
+}

Tasks/FuncToolsInstallerV0/Strings/resources.resjson/en-US/resources.resjson

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+{
+  "loc.friendlyName": "Install Azure Func Core Tools",
+  "loc.helpMarkDown": "[Learn more about this task](https://aka.ms/func-tools-installer)",
+  "loc.description": "Install Azure Func Core Tools",
+  "loc.instanceNameFormat": "Install func tools - $(version)",
+  "loc.input.label.version": "Version",
+  "loc.input.help.version": "Specify the version of Azure func tools to install. Ex:<br><br>2.7.1575<br>v2.7.1575<br>latest",
+  "loc.messages.ErrorFetchingLatestVersion": "An error occured while fetching the latest version info from %s. Error: %s. Downloading default stable version: %s.",
+  "loc.messages.FindingLatestFuncToolsVersion": "Finding latest func tools version...",
+  "loc.messages.FuncDownloadFailed": "Failed to download func tools from location %s. Error %s.",
+  "loc.messages.LatestFuncToolsVersion": "Latest version is %s",
+  "loc.messages.NotAValidSemverVersion": "Version not specified in correct format. Ex: 2.7.1575, v2.7.1575, latest",
+  "loc.messages.SuccessfullyDownloaded": "Successfully downloaded func tools %s. Download path: %s.",
+  "loc.messages.VerifyingFuncToolsInstallation": "Verifying func tools installation...",
+  "loc.messages.VersionAlreadyInstalled": "Func tool version %s is already installed. Installation path: %s."
+}

Tasks/FuncToolsInstallerV0/make.json

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+{
+    "common": [{
+        "module": "../Common/func-tools-common",
+        "type": "node",
+        "dest" : "./",
+        "compile" : true
+    }],
+    "rm": [
+        {
+            "items": [
+                "node_modules/func-tools-common/node_modules/azure-pipelines-task-lib"
+            ],
+            "options": "-Rf"
+        }
+    ]
+}