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* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import type { Credentials } from 'google-auth-library';
import {
OAuth2Client,
Compute,
CodeChallengeMethod,
} from 'google-auth-library';
import * as http from 'node:http';
import url from 'node:url';
import * as crypto from 'node:crypto';
import * as net from 'node:net';
import * as path from 'node:path';
import { promises as fs } from 'node:fs';
import type { Config } from '../config/config';
import { getErrorMessage, FatalAuthenticationError } from '../utils/errors';
import { UserAccountManager } from '../utils/userAccountManager';
import { AuthType } from '../core/contentGenerator';
import readline from 'node:readline';
import { Storage } from '../config/storage';
import { OAuthCredentialStorage } from './oauth-credential-storage';
import { FORCE_ENCRYPTED_FILE_ENV_VAR } from '../mcp/token-storage/index';
const userAccountManager = new UserAccountManager();
// OAuth Client ID used to initiate OAuth2Client class.
const OAUTH_CLIENT_ID =
'681255809395-oo8ft2oprdrnp9e3aqf6av3hmdib135j.apps.googleusercontent.com';
// OAuth Secret value used to initiate OAuth2Client class.
// Note: It's ok to save this in git because this is an installed application
// as described here: https://developers.google.com/identity/protocols/oauth2#installed
// "The process results in a client ID and, in some cases, a client secret,
// which you embed in the source code of your application. (In this context,
// the client secret is obviously not treated as a secret.)"
const OAUTH_CLIENT_SECRET = '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';
// OAuth Scopes for Cloud Code authorization.
const OAUTH_SCOPE = [
'https://www.googleapis.com/auth/cloud-platform',
'https://www.googleapis.com/auth/userinfo.email',
'https://www.googleapis.com/auth/userinfo.profile',
];
const HTTP_REDIRECT = 301;
const SIGN_IN_SUCCESS_URL =
'https://developers.google.com/gemini-code-assist/auth_success_gemini';
const SIGN_IN_FAILURE_URL =
'https://developers.google.com/gemini-code-assist/auth_failure_gemini';
/**
* An Authentication URL for updating the credentials of a Oauth2Client
* as well as a promise that will resolve when the credentials have
* been refreshed (or which throws error when refreshing credentials failed).
*/
export interface OauthWebLogin {
authUrl: string;
loginCompletePromise: Promise<void>;
}
const oauthClientPromises = new Map<AuthType, Promise<OAuth2Client>>();
function getUseEncryptedStorageFlag() {
return process.env[FORCE_ENCRYPTED_FILE_ENV_VAR] === 'true';
}
async function initOauthClient(
authType: AuthType,
config: Config,
): Promise<OAuth2Client> {
const client = new OAuth2Client({
clientId: OAUTH_CLIENT_ID,
clientSecret: OAUTH_CLIENT_SECRET,
});
const useEncryptedStorage = getUseEncryptedStorageFlag();
Iif (
process.env['GOOGLE_GENAI_USE_GCA'] &&
process.env['GOOGLE_CLOUD_ACCESS_TOKEN']
) {
client.setCredentials({
access_token: process.env['GOOGLE_CLOUD_ACCESS_TOKEN'],
});
await fetchAndCacheUserInfo(client);
return client;
}
client.on('tokens', async (tokens: Credentials) => {
if (useEncryptedStorage) {
await OAuthCredentialStorage.saveCredentials(tokens);
} else {
await cacheCredentials(tokens);
}
});
// If there are cached creds on disk, they always take precedence
Iif (await loadCachedCredentials(client)) {
// Found valid cached credentials.
// Check if we need to retrieve Google Account ID or Email
Iif (!userAccountManager.getCachedGoogleAccount()) {
try {
await fetchAndCacheUserInfo(client);
} catch (error) {
// Non-fatal, continue with existing auth.
console.warn('Failed to fetch user info:', getErrorMessage(error));
}
}
console.log('Loaded cached credentials.');
return client;
}
// In Google Cloud Shell, we can use Application Default Credentials (ADC)
// provided via its metadata server to authenticate non-interactively using
// the identity of the user logged into Cloud Shell.
Iif (authType === AuthType.CLOUD_SHELL) {
try {
console.log("Attempting to authenticate via Cloud Shell VM's ADC.");
const computeClient = new Compute({
// We can leave this empty, since the metadata server will provide
// the service account email.
});
await computeClient.getAccessToken();
console.log('Authentication successful.');
// Do not cache creds in this case; note that Compute client will handle its own refresh
return computeClient;
} catch (e) {
throw new Error(
`Could not authenticate using Cloud Shell credentials. Please select a different authentication method or ensure you are in a properly configured environment. Error: ${getErrorMessage(
e,
)}`,
);
}
}
if (config.isBrowserLaunchSuppressed()) {
let success = false;
const maxRetries = 2;
for (let i = 0; !success && i < maxRetries; i++) {
success = await authWithUserCode(client);
Iif (!success) {
console.error(
'\nFailed to authenticate with user code.',
i === maxRetries - 1 ? '' : 'Retrying...\n',
);
}
}
Iif (!success) {
throw new FatalAuthenticationError(
'Failed to authenticate with user code.',
);
}
} else {
const webLogin = await authWithWeb(client);
console.log(
`\n\nCode Assist login required.\n` +
`Attempting to open authentication page in your browser.\n` +
`Otherwise navigate to:\n\n${webLogin.authUrl}\n\n`,
);
try {
const { default: open } = await import('open');
// Attempt to open the authentication URL in the default browser.
// We do not use the `wait` option here because the main script's execution
// is already paused by `loginCompletePromise`, which awaits the server callback.
const childProcess = await open(webLogin.authUrl);
// IMPORTANT: Attach an error handler to the returned child process.
// Without this, if `open` fails to spawn a process (e.g., `xdg-open` is not found
// in a minimal Docker container), it will emit an unhandled 'error' event,
// causing the entire Node.js process to crash.
childProcess.on('error', (error) => {
console.error(
'Failed to open browser automatically. Please try running again with NO_BROWSER=true set.',
);
console.error('Browser error details:', getErrorMessage(error));
});
} catch (err) {
console.error(
'An unexpected error occurred while trying to open the browser:',
getErrorMessage(err),
'\nThis might be due to browser compatibility issues or system configuration.',
'\nPlease try running again with NO_BROWSER=true set for manual authentication.',
);
throw new FatalAuthenticationError(
`Failed to open browser: ${getErrorMessage(err)}`,
);
}
console.log('Waiting for authentication...');
// Add timeout to prevent infinite waiting when browser tab gets stuck
const authTimeout = 5 * 60 * 1000; // 5 minutes timeout
const timeoutPromise = new Promise<never>((_, reject) => {
setTimeout(() => {
reject(
new FatalAuthenticationError(
'Authentication timed out after 5 minutes. The browser tab may have gotten stuck in a loading state. ' +
'Please try again or use NO_BROWSER=true for manual authentication.',
),
);
}, authTimeout);
});
await Promise.race([webLogin.loginCompletePromise, timeoutPromise]);
}
return client;
}
export async function getOauthClient(
authType: AuthType,
config: Config,
): Promise<OAuth2Client> {
if (!oauthClientPromises.has(authType)) {
oauthClientPromises.set(authType, initOauthClient(authType, config));
}
return oauthClientPromises.get(authType)!;
}
async function authWithUserCode(client: OAuth2Client): Promise<boolean> {
const redirectUri = 'https://codeassist.google.com/authcode';
const codeVerifier = await client.generateCodeVerifierAsync();
const state = crypto.randomBytes(32).toString('hex');
const authUrl: string = client.generateAuthUrl({
redirect_uri: redirectUri,
access_type: 'offline',
scope: OAUTH_SCOPE,
code_challenge_method: CodeChallengeMethod.S256,
code_challenge: codeVerifier.codeChallenge,
state,
});
console.log('Please visit the following URL to authorize the application:');
console.log('');
console.log(authUrl);
console.log('');
const code = await new Promise<string>((resolve) => {
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
});
rl.question('Enter the authorization code: ', (code) => {
rl.close();
resolve(code.trim());
});
});
Iif (!code) {
console.error('Authorization code is required.');
return false;
}
try {
const { tokens } = await client.getToken({
code,
codeVerifier: codeVerifier.codeVerifier,
redirect_uri: redirectUri,
});
client.setCredentials(tokens);
} catch (error) {
console.error(
'Failed to authenticate with authorization code:',
getErrorMessage(error),
);
return false;
}
return true;
}
async function authWithWeb(client: OAuth2Client): Promise<OauthWebLogin> {
const port = await getAvailablePort();
// The hostname used for the HTTP server binding (e.g., '0.0.0.0' in Docker).
const host = process.env['OAUTH_CALLBACK_HOST'] || 'localhost';
// The `redirectUri` sent to Google's authorization server MUST use a loopback IP literal
// (i.e., 'localhost' or '127.0.0.1'). This is a strict security policy for credentials of
// type 'Desktop app' or 'Web application' (when using loopback flow) to mitigate
// authorization code interception attacks.
const redirectUri = `http://localhost:${port}/oauth2callback`;
const state = crypto.randomBytes(32).toString('hex');
const authUrl = client.generateAuthUrl({
redirect_uri: redirectUri,
access_type: 'offline',
scope: OAUTH_SCOPE,
state,
});
const loginCompletePromise = new Promise<void>((resolve, reject) => {
const server = http.createServer(async (req, res) => {
try {
Iif (req.url!.indexOf('/oauth2callback') === -1) {
res.writeHead(HTTP_REDIRECT, { Location: SIGN_IN_FAILURE_URL });
res.end();
reject(
new FatalAuthenticationError(
'OAuth callback not received. Unexpected request: ' + req.url,
),
);
}
// acquire the code from the querystring, and close the web server.
const qs = new url.URL(req.url!, 'http://localhost:3000').searchParams;
if (qs.get('error')) {
res.writeHead(HTTP_REDIRECT, { Location: SIGN_IN_FAILURE_URL });
res.end();
const errorCode = qs.get('error');
const errorDescription =
qs.get('error_description') || 'No additional details provided';
reject(
new FatalAuthenticationError(
`Google OAuth error: ${errorCode}. ${errorDescription}`,
),
);
} else if (qs.get('state') !== state) {
res.end('State mismatch. Possible CSRF attack');
reject(
new FatalAuthenticationError(
'OAuth state mismatch. Possible CSRF attack or browser session issue.',
),
);
} else if (qs.get('code')) {
try {
const { tokens } = await client.getToken({
code: qs.get('code')!,
redirect_uri: redirectUri,
});
client.setCredentials(tokens);
// Retrieve and cache Google Account ID during authentication
try {
await fetchAndCacheUserInfo(client);
} catch (error) {
console.warn(
'Failed to retrieve Google Account ID during authentication:',
getErrorMessage(error),
);
// Don't fail the auth flow if Google Account ID retrieval fails
}
res.writeHead(HTTP_REDIRECT, { Location: SIGN_IN_SUCCESS_URL });
res.end();
resolve();
} catch (error) {
res.writeHead(HTTP_REDIRECT, { Location: SIGN_IN_FAILURE_URL });
res.end();
reject(
new FatalAuthenticationError(
`Failed to exchange authorization code for tokens: ${getErrorMessage(error)}`,
),
);
}
} else {
reject(
new FatalAuthenticationError(
'No authorization code received from Google OAuth. Please try authenticating again.',
),
);
}
} catch (e) {
// Provide more specific error message for unexpected errors during OAuth flow
if (e instanceof FatalAuthenticationError) {
reject(e);
} else {
reject(
new FatalAuthenticationError(
`Unexpected error during OAuth authentication: ${getErrorMessage(e)}`,
),
);
}
} finally {
server.close();
}
});
server.listen(port, host, () => {
// Server started successfully
});
server.on('error', (err) => {
reject(
new FatalAuthenticationError(
`OAuth callback server error: ${getErrorMessage(err)}`,
),
);
});
});
return {
authUrl,
loginCompletePromise,
};
}
export function getAvailablePort(): Promise<number> {
return new Promise((resolve, reject) => {
let port = 0;
try {
const portStr = process.env['OAUTH_CALLBACK_PORT'];
Iif (portStr) {
port = parseInt(portStr, 10);
Iif (isNaN(port) || port <= 0 || port > 65535) {
return reject(
new Error(`Invalid value for OAUTH_CALLBACK_PORT: "${portStr}"`),
);
}
return resolve(port);
}
const server = net.createServer();
server.listen(0, () => {
const address = server.address()! as net.AddressInfo;
port = address.port;
});
server.on('listening', () => {
server.close();
server.unref();
});
server.on('error', (e) => reject(e));
server.on('close', () => resolve(port));
} catch (e) {
reject(e);
}
});
}
async function loadCachedCredentials(client: OAuth2Client): Promise<boolean> {
const useEncryptedStorage = getUseEncryptedStorageFlag();
Iif (useEncryptedStorage) {
const credentials = await OAuthCredentialStorage.loadCredentials();
Iif (credentials) {
client.setCredentials(credentials);
return true;
}
return false;
}
const pathsToTry = [
Storage.getOAuthCredsPath(),
process.env['GOOGLE_APPLICATION_CREDENTIALS'],
].filter((p): p is string => !!p);
for (const keyFile of pathsToTry) {
try {
const creds = await fs.readFile(keyFile, 'utf-8');
client.setCredentials(JSON.parse(creds));
// This will verify locally that the credentials look good.
const { token } = await client.getAccessToken();
Iif (!token) {
continue;
}
// This will check with the server to see if it hasn't been revoked.
await client.getTokenInfo(token);
return true;
} catch (error) {
// Log specific error for debugging, but continue trying other paths
console.debug(
`Failed to load credentials from ${keyFile}:`,
getErrorMessage(error),
);
}
}
return false;
}
async function cacheCredentials(credentials: Credentials) {
const filePath = Storage.getOAuthCredsPath();
await fs.mkdir(path.dirname(filePath), { recursive: true });
const credString = JSON.stringify(credentials, null, 2);
await fs.writeFile(filePath, credString, { mode: 0o600 });
try {
await fs.chmod(filePath, 0o600);
} catch {
/* empty */
}
}
export function clearOauthClientCache() {
oauthClientPromises.clear();
}
export async function clearCachedCredentialFile() {
try {
const useEncryptedStorage = getUseEncryptedStorageFlag();
if (useEncryptedStorage) {
await OAuthCredentialStorage.clearCredentials();
} else {
await fs.rm(Storage.getOAuthCredsPath(), { force: true });
}
// Clear the Google Account ID cache when credentials are cleared
await userAccountManager.clearCachedGoogleAccount();
// Clear the in-memory OAuth client cache to force re-authentication
clearOauthClientCache();
} catch (e) {
console.error('Failed to clear cached credentials:', e);
}
}
async function fetchAndCacheUserInfo(client: OAuth2Client): Promise<void> {
try {
const { token } = await client.getAccessToken();
Iif (!token) {
return;
}
const response = await fetch(
'https://www.googleapis.com/oauth2/v2/userinfo',
{
headers: {
Authorization: `Bearer ${token}`,
},
},
);
Iif (!response.ok) {
console.error(
'Failed to fetch user info:',
response.status,
response.statusText,
);
return;
}
const userInfo = await response.json();
await userAccountManager.cacheGoogleAccount(userInfo.email);
} catch (error) {
console.error('Error retrieving user info:', error);
}
}
// Helper to ensure test isolation
export function resetOauthClientForTesting() {
oauthClientPromises.clear();
} |