refactored google login to use cognito federation

backend/package.json

@@ -10,7 +10,7 @@
     "build": "tsc",
     "watch": "tsc -w",
     "start": "node dist/handlers/api.js",
-    "dev": "ts-node src/handlers/api.ts",
+    "dev": "ts-node src/server.ts",
     "test": "jest",
     "lint": "eslint src/**/*.ts",
     "lint:fix": "eslint src/**/*.ts --fix",
@@ -19,8 +19,10 @@
   "dependencies": {
     "@aws-sdk/client-cognito-identity-provider": "^3.400.0",
     "@fastify/aws-lambda": "^4.0.0",
+    "@fastify/cookie": "^9.4.0",
     "@fastify/cors": "^9.0.0",
     "aws-jwt-verify": "^4.0.0",
+    "axios": "^1.10.0",
     "dotenv": "^17.0.1",
     "fastify": "^4.21.0",
     "google-auth-library": "^9.0.0"

backend/src/app.ts

@@ -0,0 +1,48 @@
+import { FastifyInstance, fastify } from 'fastify';
+import { getConfig } from './config';
+import { Logger } from './utils/logger';
+
+// Import middleware
+import { registerCors } from './middleware/cors';
+import { registerAuth } from './middleware/auth';
+
+// Import route modules
+import { registerHealthRoutes } from './routes/health';
+import { registerAuthRoutes } from './routes/auth';
+import { registerUserRoutes } from './routes/users';
+
+export interface AppOptions {
+  environment?: 'development' | 'lambda';
+  logger?: boolean;
+}
+
+/**
+ * Creates and configures the main Fastify application
+ * This factory can be used by both development server and Lambda handler
+ */
+export function createApp(options: AppOptions = {}): FastifyInstance {
+  const config = getConfig();
+  const logger = new Logger({ service: 'App' });
+
+  const app = fastify({
+    logger: options.logger ?? false,
+  });
+
+  logger.info('Creating Fastify application', {
+    environment: options.environment || 'unknown',
+    stage: config.app.stage,
+  });
+
+  // Register middleware in order
+  registerCors(app, config);
+  registerAuth(app, options.environment);
+
+  // Register route modules
+  registerHealthRoutes(app);
+  registerAuthRoutes(app);
+  registerUserRoutes(app);
+
+  logger.info('Fastify application created successfully');
+
+  return app;
+} 

backend/src/config/index.ts

@@ -14,6 +14,7 @@ export interface AppConfig {
       userPoolId: string;
       clientId: string;
       clientSecret: string;
+      domain: string;
     };
   };
 
@@ -64,7 +65,8 @@ function validateConfiguration(): AppConfig {
         cognito: {
           userPoolId: getRequiredEnvVar('COGNITO_USER_POOL_ID'),
           clientId: getRequiredEnvVar('COGNITO_CLIENT_ID'),
-          clientSecret: getRequiredEnvVar('COGNITO_CLIENT_SECRET'),
+          clientSecret: getOptionalEnvVar('COGNITO_CLIENT_SECRET', ''), // Will be retrieved at runtime if empty
+          domain: getOptionalEnvVar('COGNITO_DOMAIN', ''),
         },
       },
       google: {