357 lines
18 KiB
JavaScript
357 lines
18 KiB
JavaScript
import { OAuth2Client } from 'google-auth-library';
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import * as http from 'http';
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import { promises as fs } from 'fs';
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import * as path from 'path';
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import * as os from 'os';
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import * as readline from 'readline';
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import { API_ACTIONS, ensureRolesInContents, formatExpiryTime } from '../common.js';
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// --- Constants ---
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const AUTH_REDIRECT_PORT = 8085;
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const CREDENTIALS_DIR = '.gemini';
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const CREDENTIALS_FILE = 'oauth_creds.json';
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const CODE_ASSIST_ENDPOINT = 'https://cloudcode-pa.googleapis.com';
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const CODE_ASSIST_API_VERSION = 'v1internal';
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const OAUTH_CLIENT_ID = '681255809395-oo8ft2oprdrnp9e3aqf6av3hmdib135j.apps.googleusercontent.com';
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const OAUTH_CLIENT_SECRET = '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';
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const GEMINI_MODELS = ['gemini-2.5-flash', 'gemini-2.5-flash-lite', 'gemini-2.5-pro'];
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function toGeminiApiResponse(codeAssistResponse) {
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if (!codeAssistResponse) return null;
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const compliantResponse = { candidates: codeAssistResponse.candidates };
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if (codeAssistResponse.usageMetadata) compliantResponse.usageMetadata = codeAssistResponse.usageMetadata;
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if (codeAssistResponse.promptFeedback) compliantResponse.promptFeedback = codeAssistResponse.promptFeedback;
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if (codeAssistResponse.automaticFunctionCallingHistory) compliantResponse.automaticFunctionCallingHistory = codeAssistResponse.automaticFunctionCallingHistory;
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return compliantResponse;
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}
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export class GeminiApiService {
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constructor(config) {
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this.authClient = new OAuth2Client(OAUTH_CLIENT_ID, OAUTH_CLIENT_SECRET);
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this.availableModels = [];
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this.isInitialized = false;
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this.config = config;
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this.host = config.HOST;
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this.oauthCredsBase64 = config.GEMINI_OAUTH_CREDS_BASE64;
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this.oauthCredsFilePath = config.GEMINI_OAUTH_CREDS_FILE_PATH;
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this.projectId = config.PROJECT_ID;
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}
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async initialize() {
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if (this.isInitialized) return;
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console.log('[Gemini] Initializing Gemini API Service...');
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await this.initializeAuth();
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if (!this.projectId) {
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this.projectId = await this.discoverProjectAndModels();
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} else {
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console.log(`[Gemini] Using provided Project ID: ${this.projectId}`);
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this.availableModels = GEMINI_MODELS;
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console.log(`[Gemini] Using fixed models: [${this.availableModels.join(', ')}]`);
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}
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if (this.projectId === 'default') {
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throw new Error("Error: 'default' is not a valid project ID. Please provide a valid Google Cloud Project ID using the --project-id argument.");
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}
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this.isInitialized = true;
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console.log(`[Gemini] Initialization complete. Project ID: ${this.projectId}`);
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}
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async initializeAuth(forceRefresh = false) {
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if (this.authClient.credentials.access_token && !forceRefresh) return;
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if (this.oauthCredsBase64) {
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try {
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const decoded = Buffer.from(this.oauthCredsBase64, 'base64').toString('utf8');
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const credentials = JSON.parse(decoded);
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this.authClient.setCredentials(credentials);
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console.log('[Gemini Auth] Authentication configured successfully from base64 string.');
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return;
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} catch (error) {
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console.error('[Gemini Auth] Failed to parse base64 OAuth credentials:', error);
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throw new Error(`Failed to load OAuth credentials from base64 string.`);
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}
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}
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const credPath = this.oauthCredsFilePath || path.join(os.homedir(), CREDENTIALS_DIR, CREDENTIALS_FILE);
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try {
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const data = await fs.readFile(credPath, "utf8");
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const credentials = JSON.parse(data);
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this.authClient.setCredentials(credentials);
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console.log('[Gemini Auth] Authentication configured successfully from file.');
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if (forceRefresh) {
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console.log('[Gemini Auth] Forcing token refresh...');
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const { credentials: newCredentials } = await this.authClient.refreshAccessToken();
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this.authClient.setCredentials(newCredentials);
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await fs.writeFile(credPath, JSON.stringify(newCredentials, null, 2));
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console.log('[Gemini Auth] Token refresh response: ok');
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}
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} catch (error) {
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console.error('[Gemini Auth] Error initializing authentication:', error.code);
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if (error.code === 'ENOENT' || error.code === 400) {
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console.log(`[Gemini Auth] Credentials file '${credPath}' not found. Starting new authentication flow...`);
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const newTokens = await this.getNewToken(credPath);
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this.authClient.setCredentials(newTokens);
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console.log('[Gemini Auth] New token obtained and loaded into memory.');
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} else {
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console.error('[Gemini Auth] Failed to initialize authentication from file:', error);
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throw new Error(`Failed to load OAuth credentials.`);
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}
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}
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}
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async getNewToken(credPath) {
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let host = this.host;
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if (!host || host === 'undefined') {
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host = '127.0.0.1';
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}
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const redirectUri = `http://${host}:${AUTH_REDIRECT_PORT}`;
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this.authClient.redirectUri = redirectUri;
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return new Promise((resolve, reject) => {
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const authUrl = this.authClient.generateAuthUrl({ access_type: 'offline', scope: ['https://www.googleapis.com/auth/cloud-platform'] });
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console.log('\n[Gemini Auth] Please open this URL in your browser to authenticate:');
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console.log(authUrl, '\n');
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const server = http.createServer(async (req, res) => {
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try {
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const url = new URL(req.url, redirectUri);
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const code = url.searchParams.get('code');
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const errorParam = url.searchParams.get('error');
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if (code) {
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console.log(`[Gemini Auth] Received successful callback from Google: ${req.url}`);
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res.writeHead(200, { 'Content-Type': 'text/plain' });
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res.end('Authentication successful! You can close this browser tab.');
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server.close();
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const { tokens } = await this.authClient.getToken(code);
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await fs.mkdir(path.dirname(credPath), { recursive: true });
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await fs.writeFile(credPath, JSON.stringify(tokens, null, 2));
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console.log('[Gemini Auth] New token received and saved to file.');
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resolve(tokens);
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} else if (errorParam) {
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const errorMessage = `Authentication failed. Google returned an error: ${errorParam}.`;
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res.writeHead(400, { 'Content-Type': 'text/plain' });
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res.end(errorMessage);
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server.close();
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reject(new Error(errorMessage));
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} else {
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console.log(`[Gemini Auth] Ignoring irrelevant request: ${req.url}`);
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res.writeHead(204);
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res.end();
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}
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} catch (e) {
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if (server.listening) server.close();
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reject(e);
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}
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});
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server.on('error', (err) => {
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if (err.code === 'EADDRINUSE') {
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const errorMessage = `[Gemini Auth] Port ${AUTH_REDIRECT_PORT} on ${this.host} is already in use.`;
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console.error(errorMessage);
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reject(new Error(errorMessage));
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} else {
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reject(err);
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}
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});
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server.listen(AUTH_REDIRECT_PORT, this.host);
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});
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}
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async discoverProjectAndModels() {
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if (this.projectId) {
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console.log(`[Gemini] Using pre-configured Project ID: ${this.projectId}`);
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return this.projectId;
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}
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console.log('[Gemini] Discovering Project ID...');
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this.availableModels = GEMINI_MODELS;
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console.log(`[Gemini] Using fixed models: [${this.availableModels.join(', ')}]`);
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try {
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const initialProjectId = "default"
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// Prepare client metadata
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const clientMetadata = {
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ideType: "IDE_UNSPECIFIED",
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platform: "PLATFORM_UNSPECIFIED",
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pluginType: "GEMINI",
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duetProject: initialProjectId,
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}
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const loadResponse = await this.callApi('loadCodeAssist', { metadata: clientMetadata });
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if (loadResponse.cloudaicompanionProject) {
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return loadResponse.cloudaicompanionProject;
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}
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const defaultTier = loadResponse.allowedTiers?.find(tier => tier.isDefault);
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const onboardRequest = { tierId: defaultTier?.id || 'free-tier', metadata: clientMetadata , cloudaicompanionProject: initialProjectId,};
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let lro = await this.callApi('onboardUser', onboardRequest);
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while (!lro.done) {
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await new Promise(resolve => setTimeout(resolve, 2000));
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lro = await this.callApi('onboardUser', onboardRequest);
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}
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return lro.response?.cloudaicompanionProject?.id;
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} catch (error) {
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console.error('[Gemini] Failed to discover Project ID:', error.response?.data || error.message);
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throw new Error('Could not discover a valid Google Cloud Project ID.');
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}
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}
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async listModels() {
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if (!this.isInitialized) await this.initialize();
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const formattedModels = this.availableModels.map(modelId => {
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const displayName = modelId.split('-').map(word => word.charAt(0).toUpperCase() + word.slice(1)).join(' ');
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return {
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name: `models/${modelId}`, version: "1.0.0", displayName: displayName,
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description: `A generative model for text and chat generation. ID: ${modelId}`,
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inputTokenLimit: 32768, outputTokenLimit: 8192,
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supportedGenerationMethods: ["generateContent", "streamGenerateContent"],
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};
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});
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return { models: formattedModels };
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}
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async callApi(method, body, isRetry = false, retryCount = 0) {
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const maxRetries = this.config.REQUEST_MAX_RETRIES;
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const baseDelay = this.config.REQUEST_BASE_DELAY; // 1 second base delay
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try {
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const requestOptions = {
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url: `${CODE_ASSIST_ENDPOINT}/${CODE_ASSIST_API_VERSION}:${method}`,
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method: "POST",
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headers: { "Content-Type": "application/json" },
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responseType: "json",
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body: JSON.stringify(body),
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};
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const res = await this.authClient.request(requestOptions);
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return res.data;
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} catch (error) {
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if ((error.response?.status === 400 || error.response?.status === 401) && !isRetry) {
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console.log('[API] Received 401. Refreshing auth and retrying...');
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await this.initializeAuth(true);
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return this.callApi(method, body, true, retryCount);
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}
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// Handle 429 (Too Many Requests) with exponential backoff
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if (error.response?.status === 429 && retryCount < maxRetries) {
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const delay = baseDelay * Math.pow(2, retryCount);
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console.log(`[API] Received 429 (Too Many Requests). Retrying in ${delay}ms... (attempt ${retryCount + 1}/${maxRetries})`);
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await new Promise(resolve => setTimeout(resolve, delay));
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return this.callApi(method, body, isRetry, retryCount + 1);
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}
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// Handle other retryable errors (5xx server errors)
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if (error.response?.status >= 500 && error.response?.status < 600 && retryCount < maxRetries) {
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const delay = baseDelay * Math.pow(2, retryCount);
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console.log(`[API] Received ${error.response.status} server error. Retrying in ${delay}ms... (attempt ${retryCount + 1}/${maxRetries})`);
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await new Promise(resolve => setTimeout(resolve, delay));
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return this.callApi(method, body, isRetry, retryCount + 1);
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}
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throw error;
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}
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}
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async * streamApi(method, body, isRetry = false, retryCount = 0) {
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const maxRetries = this.config.REQUEST_MAX_RETRIES;
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const baseDelay = this.config.REQUEST_BASE_DELAY; // 1 second base delay
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try {
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const requestOptions = {
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url: `${CODE_ASSIST_ENDPOINT}/${CODE_ASSIST_API_VERSION}:${method}`,
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method: "POST",
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params: { alt: "sse" },
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headers: { "Content-Type": "application/json" },
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responseType: "stream",
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body: JSON.stringify(body),
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};
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const res = await this.authClient.request(requestOptions);
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if (res.status !== 200) {
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let errorBody = '';
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for await (const chunk of res.data) errorBody += chunk.toString();
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throw new Error(`Upstream API Error (Status ${res.status}): ${errorBody}`);
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}
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yield* this.parseSSEStream(res.data);
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} catch (error) {
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if ((error.response?.status === 400 || error.response?.status === 401) && !isRetry) {
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console.log('[API] Received 401 during stream. Refreshing auth and retrying...');
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await this.initializeAuth(true);
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yield* this.streamApi(method, body, true, retryCount);
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return;
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}
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// Handle 429 (Too Many Requests) with exponential backoff
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if (error.response?.status === 429 && retryCount < maxRetries) {
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const delay = baseDelay * Math.pow(2, retryCount);
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console.log(`[API] Received 429 (Too Many Requests) during stream. Retrying in ${delay}ms... (attempt ${retryCount + 1}/${maxRetries})`);
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await new Promise(resolve => setTimeout(resolve, delay));
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yield* this.streamApi(method, body, isRetry, retryCount + 1);
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return;
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}
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// Handle other retryable errors (5xx server errors)
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if (error.response?.status >= 500 && error.response?.status < 600 && retryCount < maxRetries) {
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const delay = baseDelay * Math.pow(2, retryCount);
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console.log(`[API] Received ${error.response.status} server error during stream. Retrying in ${delay}ms... (attempt ${retryCount + 1}/${maxRetries})`);
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await new Promise(resolve => setTimeout(resolve, delay));
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yield* this.streamApi(method, body, isRetry, retryCount + 1);
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return;
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}
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throw error;
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}
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}
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async * parseSSEStream(stream) {
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const rl = readline.createInterface({ input: stream, crlfDelay: Infinity });
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let buffer = [];
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for await (const line of rl) {
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if (line.startsWith("data: ")) buffer.push(line.slice(6));
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else if (line === "" && buffer.length > 0) {
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try { yield JSON.parse(buffer.join('\n')); } catch (e) { console.error("[Stream] Failed to parse JSON chunk:", buffer.join('\n')); }
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buffer = [];
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}
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}
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if (buffer.length > 0) {
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try { yield JSON.parse(buffer.join('\n')); } catch (e) { console.error("[Stream] Failed to parse final JSON chunk:", buffer.join('\n')); }
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}
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}
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async generateContent(model, requestBody) {
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console.log(`[Auth Token] Time until expiry: ${formatExpiryTime(this.authClient.credentials.expiry_date)}`);
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let selectedModel = model;
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if (!GEMINI_MODELS.includes(model)) {
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console.warn(`[Gemini] Model '${model}' not found. Using default model: '${GEMINI_MODELS[0]}'`);
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selectedModel = GEMINI_MODELS[0];
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}
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const processedRequestBody = ensureRolesInContents(requestBody);
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const apiRequest = { model: selectedModel, project: this.projectId, request: processedRequestBody };
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const response = await this.callApi(API_ACTIONS.GENERATE_CONTENT, apiRequest);
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return toGeminiApiResponse(response.response);
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}
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async * generateContentStream(model, requestBody) {
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console.log(`[Auth Token] Time until expiry: ${formatExpiryTime(this.authClient.credentials.expiry_date)}`);
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let selectedModel = model;
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if (!GEMINI_MODELS.includes(model)) {
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console.warn(`[Gemini] Model '${model}' not found. Using default model: '${GEMINI_MODELS[0]}'`);
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selectedModel = GEMINI_MODELS[0];
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}
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const processedRequestBody = ensureRolesInContents(requestBody);
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const apiRequest = { model: selectedModel, project: this.projectId, request: processedRequestBody };
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const stream = this.streamApi(API_ACTIONS.STREAM_GENERATE_CONTENT, apiRequest);
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for await (const chunk of stream) {
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yield toGeminiApiResponse(chunk.response);
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}
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}
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/**
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* Checks if the given expiry date is within the next 10 minutes from now.
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* @returns {boolean} True if the expiry date is within the next 10 minutes, false otherwise.
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*/
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isExpiryDateNear() {
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try {
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const currentTime = Date.now();
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const cronNearMinutesInMillis = (this.config.CRON_NEAR_MINUTES || 10) * 60 * 1000;
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console.log(`[Gemini] Expiry date: ${this.authClient.credentials.expiry_date}, Current time: ${currentTime}, ${this.config.CRON_NEAR_MINUTES || 10} minutes from now: ${currentTime + cronNearMinutesInMillis}`);
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return this.authClient.credentials.expiry_date <= (currentTime + cronNearMinutesInMillis);
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} catch (error) {
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console.error(`[Gemini] Error checking expiry date: ${error.message}`);
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return false;
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}
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}
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}
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