// Copyright(C) 2025-2026 Advanced Micro Devices, Inc. All rights reserved. // SPDX-License-Identifier: MIT /** * GAIA SDK Documentation Proxy Server * * Auth proxy for Mintlify-hosted documentation with access code protection. * Proxies authenticated requests to the Mintlify site. * * Environment Variables: * DOCS_AUTH_ENABLED - Set to 'true' to require access code * DOCS_ACCESS_CODE - The access code users must enter * MINTLIFY_URL - The Mintlify site URL (default: https://amd-gaia.ai) * PORT - Server port (default: 3000) */ require('dotenv').config(); const express = require('express'); const { createProxyMiddleware } = require('http-proxy-middleware'); const cookieParser = require('cookie-parser'); const crypto = require('crypto'); const app = express(); const PORT = process.env.PORT || 3000; // Configuration const AUTH_ENABLED = process.env.DOCS_AUTH_ENABLED === 'true'; const ACCESS_CODE = process.env.DOCS_ACCESS_CODE || ''; const MINTLIFY_URL = process.env.MINTLIFY_URL || 'https://amd-gaia.ai'; const COOKIE_SECRET = process.env.COOKIE_SECRET || crypto.randomBytes(32).toString('hex'); const COOKIE_NAME = 'gaia_docs_auth'; const COOKIE_MAX_AGE = 7 * 24 * 60 * 60 * 1000; // 7 days // Middleware app.use(cookieParser(COOKIE_SECRET)); app.use(express.urlencoded({ extended: true })); // Generate auth token from access code function generateToken(code) { return crypto.createHmac('sha256', COOKIE_SECRET).update(code).digest('hex'); } // Verify auth token function verifyToken(token) { if (!ACCESS_CODE) return false; const expected = generateToken(ACCESS_CODE); return token === expected; } // Sanitize redirect URL to prevent open redirect attacks function sanitizeRedirect(url) { // Must start with / but not // (protocol-relative URLs) if (url && url.startsWith('/') && !url.startsWith('//')) { return url; } return '/'; } // HTML-escape a string to prevent XSS function escapeHtml(str) { return str .replace(/&/g, '&') .replace(/"/g, '"') .replace(/'/g, ''') .replace(//g, '>'); } // Login page HTML ({{REDIRECT}} placeholder for original URL) function getLoginPage(redirectUrl) { const safeRedirect = escapeHtml(sanitizeRedirect(redirectUrl)); return ` GAIA SDK Documentation - Access Required

GAIA SDK Documentation

This documentation is access-restricted. Please enter the access code to continue.

`; } // Health check endpoint (must be before auth middleware) app.get('/health', (req, res) => { res.status(200).json({ status: 'ok', auth: AUTH_ENABLED, target: MINTLIFY_URL }); }); // Auth middleware function authMiddleware(req, res, next) { // Skip auth if disabled if (!AUTH_ENABLED) { return next(); } // Skip auth for login/logout routes and health check if (req.path.startsWith('/auth/') || req.path === '/health') { return next(); } // Check for valid auth cookie const token = req.signedCookies[COOKIE_NAME]; if (token && verifyToken(token)) { return next(); } // Show login page with original URL preserved for redirect after login const originalUrl = req.originalUrl || req.url || '/'; res.status(401).send(getLoginPage(originalUrl).replace('{{ERROR}}', '')); } // Login handler app.post('/auth/login', (req, res) => { const { code, redirect } = req.body; const safeRedirect = sanitizeRedirect(redirect); if (code === ACCESS_CODE) { // Set signed cookie const token = generateToken(code); res.cookie(COOKIE_NAME, token, { signed: true, httpOnly: true, secure: process.env.NODE_ENV === 'production', maxAge: COOKIE_MAX_AGE, sameSite: 'lax' }); // Redirect to the original URL the user was trying to access res.redirect(safeRedirect); } else { // Preserve the redirect URL even on error so user can retry res.redirect(`/auth/login-error?redirect=${encodeURIComponent(safeRedirect)}`); } }); // Login error handler (preserves redirect URL) app.get('/auth/login-error', (req, res) => { const safeRedirect = sanitizeRedirect(req.query.redirect); const errorHtml = '

Invalid access code. Please try again.

'; res.status(401).send(getLoginPage(safeRedirect).replace('{{ERROR}}', errorHtml)); }); // Logout handler app.get('/auth/logout', (req, res) => { res.clearCookie(COOKIE_NAME); res.redirect('/'); }); // Apply auth middleware app.use(authMiddleware); // Proxy to Mintlify site (after auth) const proxyMiddleware = createProxyMiddleware({ target: MINTLIFY_URL, changeOrigin: true, secure: true, // Don't modify the path pathRewrite: null, // Handle proxy errors on: { error: (err, req, res) => { console.error('Proxy error:', err.message); res.status(502).send('Documentation temporarily unavailable. Please try again later.'); }, proxyReq: (proxyReq, req, res) => { // Remove cookies from proxied request (Mintlify doesn't need our auth cookies) proxyReq.removeHeader('cookie'); } } }); app.use('/', proxyMiddleware); // Start server app.listen(PORT, () => { console.log(`GAIA Docs Proxy running on port ${PORT}`); console.log(`Proxying to: ${MINTLIFY_URL}`); console.log(`Auth protection: ${AUTH_ENABLED ? 'ENABLED' : 'DISABLED'}`); if (AUTH_ENABLED && !ACCESS_CODE) { console.warn('WARNING: Auth is enabled but DOCS_ACCESS_CODE is not set!'); } });

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