332 lines
15 KiB
JavaScript
332 lines
15 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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// --- 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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export const API_ACTIONS = {
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GENERATE_CONTENT: 'generateContent',
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STREAM_GENERATE_CONTENT: 'streamGenerateContent',
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};
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// --- Utility Functions ---
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export function ensureRolesInContents(requestBody) {
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if (!requestBody || !Array.isArray(requestBody.contents)) {
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return requestBody;
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}
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const newRequestBody = JSON.parse(JSON.stringify(requestBody));
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// ** FIX: Rename system_instruction to systemInstruction for the internal API **
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// Ensure system_instruction is correctly renamed before further processing
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if (newRequestBody.system_instruction) {
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newRequestBody.systemInstruction = newRequestBody.system_instruction;
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delete newRequestBody.system_instruction;
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}
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newRequestBody.contents.forEach((content, index) => {
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if (!content.role) {
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content.role = (index % 2 === 0) ? 'user' : 'model';
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}
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});
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return newRequestBody;
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}
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export function formatExpiryTime(expiryTimestamp) {
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if (!expiryTimestamp || typeof expiryTimestamp !== 'number') return "No expiry date available";
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const diffMs = expiryTimestamp - Date.now();
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if (diffMs <= 0) return "Token has expired";
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let totalSeconds = Math.floor(diffMs / 1000);
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const hours = Math.floor(totalSeconds / 3600);
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totalSeconds %= 3600;
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const minutes = Math.floor(totalSeconds / 60);
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const seconds = totalSeconds % 60;
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const pad = (num) => String(num).padStart(2, '0');
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return `${pad(hours)}h ${pad(minutes)}m ${pad(seconds)}s`;
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}
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export async function logPrompt(promptText, logMode, logFilename) {
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if (logMode === 'none') return;
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const logContent = `--- Prompt Log @ ${new Date().toISOString()} ---\n${promptText}\n--------------------------------------\n\n`;
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if (logMode === 'console') {
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console.log(logContent);
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} else if (logMode === 'file') {
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try {
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await fs.appendFile(logFilename, logContent);
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} catch (err) {
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console.error(`[Error] Failed to write prompt to ${logFilename}:`, err);
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}
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}
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}
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export function extractPromptText(requestBody) {
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if (!requestBody) return "[No request body found]";
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const logParts = [];
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// ** FIX: Check for both snake_case and camelCase for system instruction **
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const systemInstruction = requestBody.system_instruction || requestBody.systemInstruction;
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if (systemInstruction && Array.isArray(systemInstruction.parts)) {
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const systemText = systemInstruction.parts.filter(p => p && typeof p.text === 'string').map(p => p.text).join('\n');
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if (systemText) logParts.push(`[SYSTEM INSTRUCTION]\n${systemText}`);
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}
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if (Array.isArray(requestBody.contents)) {
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const userText = requestBody.contents.flatMap(c => (c && Array.isArray(c.parts) ? c.parts : [])).filter(p => p && typeof p.text === 'string').map(p => p.text).join('\n');
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if (userText) {
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if (logParts.length > 0) logParts.push('----------------------');
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logParts.push(`[USER PROMPT]\n${userText}`);
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}
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}
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if (logParts.length === 0) return "[No text prompt or system instruction found]";
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return logParts.join('\n');
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}
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export function extractResponseText(responseObject) {
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if (!responseObject || !Array.isArray(responseObject.candidates) || responseObject.candidates.length === 0) return "";
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const firstCandidate = responseObject.candidates[0];
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if (!firstCandidate.content || !Array.isArray(firstCandidate.content.parts)) return "";
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return firstCandidate.content.parts.filter(p => p && typeof p.text === 'string').map(p => p.text).join("");
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}
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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.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 async function getRequestBody(req) {
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return new Promise((resolve, reject) => {
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let body = '';
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req.on('data', chunk => body += chunk.toString());
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req.on('end', () => {
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try {
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resolve(body ? JSON.parse(body) : {});
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} catch (e) {
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reject(new Error("Invalid JSON in request body."));
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}
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});
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req.on('error', err => reject(err));
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});
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}
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// --- Main Service Class ---
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export class GeminiApiService {
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constructor(host = 'localhost') {
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this.authClient = new OAuth2Client(OAUTH_CLIENT_ID, OAUTH_CLIENT_SECRET);
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this.projectId = null;
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this.availableModels = [];
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this.isInitialized = false;
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this.host = host;
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}
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async initialize() {
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if (this.isInitialized) return;
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console.log('[Service] Initializing Gemini API Service...');
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await this.initializeAuth();
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this.projectId = await this.discoverProjectAndModels();
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this.isInitialized = true;
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console.log(`[Service] Initialization complete. Project ID: ${this.projectId}`);
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}
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async initializeAuth(forceRefresh = false) {
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if (this.authClient.credentials.access_token && !forceRefresh) return;
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const credPath = path.join(os.homedir(), CREDENTIALS_DIR, CREDENTIALS_FILE);
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try {
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const data = await fs.readFile(credPath, "utf8");
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const credentials = JSON.parse(data);
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this.authClient.setCredentials(credentials);
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console.log('[Auth] Authentication configured successfully from file.');
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if (forceRefresh) {
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console.log('[Auth] Forcing token refresh...');
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const { credentials: newCredentials } = await this.authClient.refreshAccessToken();
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this.authClient.setCredentials(newCredentials);
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await fs.writeFile(credPath, JSON.stringify(newCredentials, null, 2));
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console.log('[Auth] Refreshed token saved.');
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}
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} catch (error) {
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if (error.code === 'ENOENT') {
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console.log(`[Auth] '${CREDENTIALS_FILE}' 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('[Auth] New token obtained and loaded into memory.');
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} else {
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console.error('[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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const redirectUri = `http://${this.host}:${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[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(`[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('[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(`[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 = `[Auth] Port ${AUTH_REDIRECT_PORT} on ${this.host} is already in use.`;
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console.error(errorMessage);
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reject(new Error(errorMessage));
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} else {
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reject(err);
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}
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});
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server.listen(AUTH_REDIRECT_PORT, this.host);
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});
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}
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async discoverProjectAndModels() {
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if (this.projectId) return this.projectId;
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console.log('[Service] Discovering Project ID...');
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this.availableModels = ['gemini-2.5-pro', 'gemini-2.5-flash'];
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console.log(`[Service] Using fixed models: [${this.availableModels.join(', ')}]`);
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try {
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const loadResponse = await this.callApi('loadCodeAssist', { metadata: { pluginType: 'GEMINI' } });
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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: { pluginType: 'GEMINI' } };
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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('[Service] 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: ${modelId}`,
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inputTokenLimit: 32768, outputTokenLimit: 8192,
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supportedGenerationMethods: ["generateContent", "streamGenerateContent"],
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};
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});
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return { models: formattedModels };
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}
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async callApi(method, body, isRetry = false) {
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try {
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const res = await this.authClient.request({
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url: `${CODE_ASSIST_ENDPOINT}/${CODE_ASSIST_API_VERSION}:${method}`,
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method: "POST", headers: { "Content-Type": "application/json" },
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responseType: "json", body: JSON.stringify(body),
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});
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return res.data;
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} catch (error) {
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if (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);
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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) {
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try {
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const res = await this.authClient.request({
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url: `${CODE_ASSIST_ENDPOINT}/${CODE_ASSIST_API_VERSION}:${method}`,
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method: "POST", params: { alt: "sse" }, headers: { "Content-Type": "application/json" },
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responseType: "stream", body: JSON.stringify(body),
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});
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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 === 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);
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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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const compliantRequestBody = ensureRolesInContents(requestBody);
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const apiRequest = { model, project: this.projectId, request: compliantRequestBody };
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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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const compliantRequestBody = ensureRolesInContents(requestBody);
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const apiRequest = { model, project: this.projectId, request: compliantRequestBody };
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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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