feat(auth): add Google OAuth callback handling

Update backend redirect to pass tokens to web API callback endpoint and add new route for token processing.

Author: Arun-kushwaha007

apps/backend/src/auth/auth.controller.ts

@@ -67,9 +67,13 @@ export class AuthController {
     });
     this.authService.setRefreshTokenCookie(res, payload.refreshToken);
 
-    // Redirect back to frontend dashboard
+    // Redirect to frontend callback to set Next.js cookies
     const frontendUrl = this.config.corsOrigins[0]; // Usually the web frontend is first
-    res.redirect(`${frontendUrl}/dashboard`);
+    const redirectUrl = new URL(`${frontendUrl}/api/auth/google/callback`);
+    redirectUrl.searchParams.set('accessToken', payload.accessToken);
+    redirectUrl.searchParams.set('refreshToken', payload.refreshToken);
+    
+    res.redirect(redirectUrl.toString());
   }
 
   @Post('refresh')

apps/web/app/api/auth/google/callback/route.ts

@@ -0,0 +1,23 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { accessCookieOptions, authCookies, refreshCookieOptions } from '../../../../../src/lib/authCookies';
+
+export async function GET(request: NextRequest) {
+  const searchParams = request.nextUrl.searchParams;
+  const accessToken = searchParams.get('accessToken');
+  const refreshToken = searchParams.get('refreshToken');
+
+  const redirectUrl = new URL('/dashboard', request.url);
+
+  if (!accessToken || !refreshToken) {
+    redirectUrl.pathname = '/login';
+    redirectUrl.searchParams.set('error', 'OAuth authentication failed');
+    return NextResponse.redirect(redirectUrl);
+  }
+
+  const response = NextResponse.redirect(redirectUrl);
+  
+  response.cookies.set(authCookies.accessToken, accessToken, accessCookieOptions);
+  response.cookies.set(authCookies.refreshToken, refreshToken, refreshCookieOptions);
+
+  return response;
+}