Refactor auth middleware and update service config usage

- Remove redundant comments and docstrings in auth_middleware.py - Use
TOKEN_SERVICE_URL env variable for AuthMiddleware - Fix sensor service
proxy path in main.py - Use datetime.now() for request_stats start_time

microservices/api-gateway/main.py

@@ -58,12 +58,7 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
-# Service registry and load balancer
-service_registry = ServiceRegistry()
-load_balancer = LoadBalancer(service_registry)
-auth_middleware = AuthMiddleware()
 
-# Service configuration
 SERVICES = {
     "token-service": ServiceConfig(
         name="token-service",
@@ -85,20 +80,23 @@ SERVICES = {
     )
 }
 
-# Request statistics
+# Service registry and load balancer
+service_registry = ServiceRegistry()
+load_balancer = LoadBalancer(service_registry)
+auth_middleware = AuthMiddleware(os.getenv("TOKEN_SERVICE_URL", "http://token-service:8001"))
+
 request_stats = {
     "total_requests": 0,
     "successful_requests": 0,
     "failed_requests": 0,
     "service_requests": {service: 0 for service in SERVICES.keys()},
-    "start_time": datetime.utcnow()
+    "start_time": datetime.now()
 }
 
 @app.get("/health", response_model=HealthResponse)
 async def gateway_health_check():
     """Gateway health check endpoint"""
     try:
-        # Check all services
         service_health = await service_registry.get_all_service_health()
 
         healthy_services = sum(1 for status in service_health.values() if status.get("status") == "healthy")
@@ -189,7 +187,7 @@ async def iot_control_service_proxy(request: Request, path: str):
 @app.api_route("/api/v1/sensors/{path:path}", methods=["GET", "POST", "PUT", "DELETE"])
 async def sensor_service_proxy(request: Request, path: str):
     """Proxy requests to sensor service"""
-    return await proxy_request(request, "sensor-service", f"/{path}")
+    return await proxy_request(request, "sensor-service", f"/sensors/{path}")
 
 # Data Ingestion Service Routes (SA4CPS FTP Monitoring)
 @app.api_route("/api/v1/ingestion/{path:path}", methods=["GET", "POST", "PUT", "DELETE"])
@@ -290,7 +288,7 @@ async def proxy_request(request: Request, service_name: str, path: str):
 
         # Check authentication if required
         if service_config.auth_required:
-            await auth_middleware.verify_token(request)
+            decoded = await auth_middleware.verify_token(request)
 
         # Get healthy service instance
         service_url = await load_balancer.get_service_url(service_name)