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/* --------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All Rights Reserved.
* See 'LICENSE' in the project root for license information.
* ------------------------------------------------------------------------------------------ */
'use strict';
import { PackageVersion } from './packageVersion';
import * as util from './common';
import { PlatformInformation } from './platform';
import { OutgoingHttpHeaders } from 'http';
const testingInsidersVsixInstall: boolean = false; // Change this to true to enable testing of the Insiders vsix installation.
/**
* The object representation of a Build Asset. Each Asset corresponds to information about a release file on GitHub.
*/
interface Asset {
name: string;
browser_download_url: string;
}
/**
* The object representation of a release in the GitHub API's release JSON.
* Named Build so as to reduce confusion between a "Release" release and "Insiders" release.
*/
interface Build {
name: string;
assets: Asset[];
}
/**
* Search each Asset by name to retrieve the download URL for a VSIX package
* @param vsixName The name of the VSIX to search for
* @return The download URL of the VSIX
*/
function getVsixDownloadUrl(build: Build, vsixName: string): string {
const downloadUrl: string = build.assets.find(asset => {
return asset.name === vsixName;
}).browser_download_url;
if (!downloadUrl) {
throw new Error('Failed to find VSIX: ' + vsixName + ' in build: ' + build.name);
}
return downloadUrl;
}
/**
* Determine whether an object is of type Asset.
* @param input Incoming object.
* @return Whether input is of type Asset.
*/
function isAsset(input: any): input is Asset {
return input && input.name && typeof(input.name) === "string" &&
input.browser_download_url && typeof(input.browser_download_url) === "string";
}
/**
* Determine whether an object is of type Build. Note that earlier releases of the extension
* do not have 4 or greater Assets (Mac, Win, Linux 32/64). Only call this on more recent Builds.
* @param input Incoming object.
* @return Whether input is of type Build.
*/
function isBuild(input: any): input is Build {
return input && input.name && typeof(input.name) === "string" && isArrayOfAssets(input.assets) && input.assets.length >= 4;
}
/**
* Determine whether an object is of type Asset[].
* @param input Incoming object.
* @return Whether input is of type Asset[].
*/
function isArrayOfAssets(input: any): input is Asset[] {
return input instanceof Array && input.every(item => isAsset(item));
}
/**
* Determine whether an object is of type Build[].
* @param input Incoming object.
* @return Whether input is of type Build[].
*/
function isArrayOfBuilds(input: any): input is Build[] {
if (!input || !(input instanceof Array) || input.length === 0) {
return false;
}
// Only check the five most recent builds for validity -- no need to check all of them
for (let i: number = 0; i < 5 && i < input.length; i++) {
if (!isBuild(input[i])) {
return false;
}
}
return true;
}
/**
* Match the user's platform information to the VSIX name relevant to them.
* @param info Information about the user's operating system.
* @return VSIX filename for the extension's releases matched to the user's platform.
*/
function vsixNameForPlatform(info: PlatformInformation): string {
const vsixName: string = function(platformInfo): string {
switch (platformInfo.platform) {
case 'win32': return 'cpptools-win32.vsix';
case 'darwin': return 'cpptools-osx.vsix';
default: {
switch (platformInfo.architecture) {
case 'x86_64': return 'cpptools-linux.vsix';
case 'x86':
case 'i386':
case 'i686': return 'cpptools-linux32.vsix';
}
}
}
}(info);
if (!vsixName) {
throw new Error('Failed to match VSIX name for: ' + info.platform + ':' + info.architecture);
}
return vsixName;
}
/**
* Interface for return value of getTargetBuildInfo containing the download URL and version of a Build.
*/
export interface BuildInfo {
downloadUrl: string;
name: string;
}
/**
* Use the GitHub API to retrieve the download URL of the extension version the user should update to, if any.
* @param updateChannel The user's updateChannel setting.
* @return Download URL for the extension VSIX package that the user should install. If the user
* does not need to update, resolves to undefined.
*/
export async function getTargetBuildInfo(updateChannel: string): Promise<BuildInfo> {
return getReleaseJson()
.then(builds => {
if (!builds || builds.length === 0) {
return undefined;
}
// If the user version is greater than or incomparable to the latest available verion then there is no need to update
// Allows testing pre-releases without accidentally downgrading to the latest version
const userVersion: PackageVersion = new PackageVersion(util.packageJson.version);
const latestVersion: PackageVersion = new PackageVersion(builds[0].name);
if (!testingInsidersVsixInstall && (userVersion.isGreaterThan(latestVersion) || (userVersion.suffix && userVersion.suffix !== 'insiders'))) {
return undefined;
}
return getTargetBuild(builds, userVersion, updateChannel);
})
.then(async build => {
if (!build) {
return Promise.resolve(undefined);
}
try {
const platformInfo: PlatformInformation = await PlatformInformation.GetPlatformInformation();
const vsixName: string = vsixNameForPlatform(platformInfo);
const downloadUrl: string = getVsixDownloadUrl(build, vsixName);
return { downloadUrl: downloadUrl, name: build.name };
} catch (error) {
return Promise.reject(error);
}
});
}
/**
* Determines whether there exists a Build in the given Build[] that should be installed.
* @param builds The GitHub release list parsed as an array of Builds.
* @param userVersion The verion of the extension that the user is running.
* @param updateChannel The user's updateChannel setting.
* @return The Build if the user should update to it, otherwise undefined.
*/
function getTargetBuild(builds: Build[], userVersion: PackageVersion, updateChannel: string): Build {
// Get predicates to determine the build to install, if any
let needsUpdate: (installed: PackageVersion, target: PackageVersion) => boolean;
let useBuild: (build: Build) => boolean;
if (updateChannel === 'Insiders') {
needsUpdate = (installed: PackageVersion, target: PackageVersion) => { return testingInsidersVsixInstall || target.isGreaterThan(installed); };
useBuild = (build: Build): boolean => { return true; };
} else if (updateChannel === 'Default') {
needsUpdate = function(installed: PackageVersion, target: PackageVersion): boolean { return installed.isGreaterThan(target); };
useBuild = (build: Build): boolean => { return build.name.indexOf('-') === -1; };
} else {
throw new Error('Incorrect updateChannel setting provided');
}
// Get the build to install
const targetBuild: Build = builds.find((build) => useBuild(build));
if (!targetBuild) {
throw new Error('Failed to determine installation candidate');
}
// Check current version against target's version to determine if the installation should happen
const targetVersion: PackageVersion = new PackageVersion(targetBuild.name);
if (needsUpdate(userVersion, targetVersion)) {
return targetBuild;
}
return undefined;
}
interface Rate {
remaining: number;
}
interface RateLimit {
rate: Rate;
}
function isRate(input: any): input is Rate {
return input && util.isNumber(input.remaining);
}
function isRateLimit(input: any): input is RateLimit {
return input && isRate(input.rate);
}
async function getRateLimit(): Promise<RateLimit> {
const header: OutgoingHttpHeaders = { 'User-Agent': 'vscode-cpptools' };
const data: string = await util.downloadFileToStr('https://api.github.com/rate_limit', header)
.catch((error) => {
if (error && error.code && error.code !== "ENOENT") {
// Only throw if the user is connected to the Internet.
throw new Error('Failed to download rate limit JSON');
}
});
if (!data) {
return Promise.resolve(null);
}
let rateLimit: any;
try {
rateLimit = JSON.parse(data);
} catch (error) {
throw new Error('Failed to parse rate limit JSON');
}
if (isRateLimit(rateLimit)) {
return Promise.resolve(rateLimit);
} else {
throw new Error('Rate limit JSON is not of type RateLimit');
}
}
async function rateLimitExceeded(): Promise<boolean> {
const rateLimit: RateLimit = await getRateLimit();
return rateLimit && rateLimit.rate.remaining <= 0;
}
/**
* Download and parse the release list JSON from the GitHub API into a Build[].
* @return Information about the released builds of the C/C++ extension.
*/
async function getReleaseJson(): Promise<Build[]> {
if (await rateLimitExceeded()) {
throw new Error('Failed to stay within GitHub API rate limit');
}
// Download release JSON
const releaseUrl: string = 'https://api.github.com/repos/Microsoft/vscode-cpptools/releases';
const header: OutgoingHttpHeaders = { 'User-Agent': 'vscode-cpptools' };
const data: string = await util.downloadFileToStr(releaseUrl, header)
.catch((error) => {
if (error && error.code && error.code !== "ENOENT") {
// Only throw if the user is connected to the Internet.
throw new Error('Failed to download release JSON');
}
});
if (!data) {
return Promise.resolve(null);
}
// Parse the file
let releaseJson: any;
try {
releaseJson = JSON.parse(data);
} catch (error) {
throw new Error('Failed to parse release JSON');
}
// Type check
if (isArrayOfBuilds(releaseJson)) {
return releaseJson;
} else {
throw new Error('Release JSON is not of type Build[]');
}
}
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