53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
const express = require('express');
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const path = require('path');
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const { GoogleAuth } = require('google-auth-library');
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const app = express();
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app.use(express.json({ limit: '1mb' }));
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const BACKEND_URL = process.env.BACKEND_URL;
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if (!BACKEND_URL) {
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console.error('FATAL: BACKEND_URL env var is required');
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process.exit(1);
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}
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const auth = new GoogleAuth();
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app.get('/health', (_req, res) => {
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res.status(200).json({ status: 'ok' });
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});
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app.post('/api/chat', async (req, res) => {
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try {
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// Create an ID-token authenticated client for the backend (audience = BACKEND_URL)
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const idTokenClient = await auth.getIdTokenClient(BACKEND_URL);
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// Forward request to backend
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const backendResp = await idTokenClient.request({
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url: `${BACKEND_URL}/chat`,
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method: 'POST',
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data: req.body,
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});
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res.status(backendResp.status).json(backendResp.data);
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} catch (err) {
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console.error('Proxy error:', err.message);
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const status = err.response?.status || 500;
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const message = err.response?.data || { error: err.message };
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res.status(status).json(message);
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}
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});
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// Serve static assets
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app.use(express.static(path.join(__dirname, 'dist')));
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// SPA fallback
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app.get('*', (_req, res) => {
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res.sendFile(path.join(__dirname, 'dist', 'index.html'));
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});
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const port = parseInt(process.env.PORT || '8080', 10);
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app.listen(port, '0.0.0.0', () => {
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console.log(`Frontend proxy listening on port ${port}`);
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});
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