add project

apps/api/src/routes/relay-proxy.routes.ts

@@ -0,0 +1,52 @@
+import { NextFunction, Request, Response, Router } from 'express';
+import { env } from '../config/env';
+
+const router = Router();
+const RELAY_API_URL = 'https://api.relay.link';
+const ALLOWED_PATHS = new Set(['/quote/v2', '/intents/status/v3']);
+
+router.use(proxyRelayRequest);
+
+export default router;
+
+async function proxyRelayRequest(req: Request, res: Response, next: NextFunction) {
+  try {
+    const relayPath = req.path;
+    if (!relayPath.startsWith('/execute/') && !ALLOWED_PATHS.has(relayPath)) {
+      res.status(404).json({ success: false, error: 'Relay endpoint not allowed' });
+      return;
+    }
+
+    const relayUrl = new URL(`${RELAY_API_URL}${relayPath}`);
+
+    Object.entries(req.query).forEach(([key, value]) => {
+      if (Array.isArray(value)) {
+        value.forEach((item) => relayUrl.searchParams.append(key, String(item)));
+        return;
+      }
+
+      if (typeof value !== 'undefined') {
+        relayUrl.searchParams.set(key, String(value));
+      }
+    });
+
+    const response = await fetch(relayUrl.toString(), {
+      method: req.method,
+      headers: {
+        Accept: 'application/json',
+        ...(req.method !== 'GET' ? { 'Content-Type': 'application/json' } : {}),
+        ...(env.relayApiKey ? { Authorization: `Bearer ${env.relayApiKey}` } : {}),
+      },
+      body: req.method === 'GET' ? undefined : JSON.stringify(req.body ?? {}),
+    });
+
+    const contentType = response.headers.get('content-type') ?? 'application/json';
+    const payload = await response.text();
+
+    res.status(response.status);
+    res.type(contentType);
+    res.send(payload);
+  } catch (error) {
+    next(error);
+  }
+}