chore: allow downloading the latest Chrome version (#9719)

packages/browsers/src/CLI.ts

@@ -20,6 +20,7 @@ import {hideBin} from 'yargs/helpers';
 
 import {resolveRevision} from './browsers/browsers.js';
 import {Browser, BrowserPlatform} from './browsers/types.js';
+import {detectBrowserPlatform} from './detectPlatform.js';
 import {fetch} from './fetch.js';
 import {computeExecutablePath, launch} from './launcher.js';
 
@@ -68,8 +69,13 @@ export class CLI {
         },
         async argv => {
           const args = argv as unknown as InstallArgs;
+          args.platform ??= detectBrowserPlatform();
+          if (!args.platform) {
+            throw new Error(`Could not resolve the current platform`);
+          }
           args.browser.revision = await resolveRevision(
             args.browser.name,
+            args.platform,
             args.browser.revision
           );
           await fetch({

packages/browsers/src/browsers/browsers.ts

@@ -32,6 +32,7 @@ export {Browser, BrowserPlatform};
 
 export async function resolveRevision(
   browser: Browser,
+  platform: BrowserPlatform,
   tag: string
 ): Promise<string> {
   switch (browser) {
@@ -40,6 +41,11 @@ export async function resolveRevision(
         case BrowserTag.LATEST:
           return await firefox.resolveRevision('FIREFOX_NIGHTLY');
       }
+    case Browser.CHROME:
+      switch (tag as BrowserTag) {
+        case BrowserTag.LATEST:
+          return await chrome.resolveRevision(platform, 'latest');
+      }
   }
   // We assume the tag is the revision if it didn't match any keywords.
   return tag;

packages/browsers/src/browsers/chrome.ts

@@ -16,6 +16,8 @@
 
 import path from 'path';
 
+import {httpRequest} from '../httpUtil.js';
+
 import {BrowserPlatform} from './types.js';
 
 function archive(platform: BrowserPlatform, revision: string): string {
@@ -79,3 +81,40 @@ export function relativeExecutablePath(
       return path.join('chrome-win', 'chrome.exe');
   }
 }
+
+export async function resolveRevision(
+  platform: BrowserPlatform,
+  // We will need it for other channels/keywords.
+  _channel: 'latest' = 'latest'
+): Promise<string> {
+  return new Promise((resolve, reject) => {
+    const request = httpRequest(
+      new URL(
+        `https://storage.googleapis.com/chromium-browser-snapshots/${folder(
+          platform
+        )}/LAST_CHANGE`
+      ),
+      'GET',
+      response => {
+        let data = '';
+        if (response.statusCode && response.statusCode >= 400) {
+          return reject(new Error(`Got status code ${response.statusCode}`));
+        }
+        response.on('data', chunk => {
+          data += chunk;
+        });
+        response.on('end', () => {
+          try {
+            return resolve(String(data));
+          } catch {
+            return reject(new Error('Chrome version not found'));
+          }
+        });
+      },
+      false
+    );
+    request.on('error', err => {
+      reject(err);
+    });
+  });
+}

packages/browsers/test/src/cli.spec.ts

@@ -83,4 +83,15 @@ describe('CLI', function () {
       '--platform=linux',
     ]);
   });
+
+  it('should download latest Chrome binaries', async () => {
+    await new CLI(tmpDir).run([
+      'npx',
+      '@puppeteer/browsers',
+      'install',
+      `chrome@latest`,
+      `--path=${tmpDir}`,
+      '--platform=linux',
+    ]);
+  });
 });