Authentication and Odata compliance

cloud/app.py

@@ -1,12 +1,16 @@
 import os
-import asyncio
-import base64
-import uuid
-from datetime import datetime, timedelta, timezone
 import sys
 import json
-from flask import Flask, request, jsonify, current_app
-from pymongo import MongoClient
+import uuid
+import base64
+import asyncio
+import fcntl
+import atexit
+from datetime import datetime, timedelta, timezone
+from flask import Flask, Response, request, jsonify, current_app, abort, g
+from pymongo import MongoClient, ASCENDING, DESCENDING
+from apscheduler.schedulers.background import BackgroundScheduler
+
 from APIs import generate
 from APIs.mqtt import send_command
 from APIs.webex import WebexManager
@@ -14,8 +18,6 @@ from APIs.shodan import ShodanAuditor
 from APIs.twilio import send_alert_sms
 from microwaveCookPlanner import MicrowaveCookPlanner
 import safety_checker
-import pymongo
-from apscheduler.schedulers.background import BackgroundScheduler
 from jobs import job_server_cve_audit, job_client_ip_audit, job_request_telemetry
 
 sys.path.insert(0, '..')
@@ -35,16 +37,25 @@ MONGO_URI = os.getenv("MONGO_URI", "mongodb://localhost:27017/")
 client = MongoClient(MONGO_URI)
 db = client["microwave_network_db"]
 
+# Database Collections
 client_collection = db["client_data"]
 cooking_collection = db["cooking_parameters"]
 telemetry_collection = db["telemetry_data"]
 alert_collection = db["alert_data"]
-webex_tokens_collection = db["webex_tokens"]  # Collection for Webex OAuth tokens
-device_ip_collection = db["device_ips"]  # Collection for device IPs
-cve_audit_results = db["cve_audit_results"]  # Collection for CVE audit results
+webex_tokens_collection = db["webex_tokens"]
+device_ip_collection = db["device_ips"]
+cve_audit_results = db["cve_audit_results"]
 
+# Initialize Database Indexes
+def init_db_indexes():
+    device_ip_collection.create_index([("received_at", DESCENDING)])
+    device_ip_collection.create_index([("client_ip", ASCENDING)])
+    alert_collection.create_index([("orchestrator_id", ASCENDING), ("created_at", DESCENDING)])
+    client_collection.create_index([("devices.device_id", ASCENDING)])
 
-# Webex Credentials & Configuration from Environment Variables
+init_db_indexes()
+
+# Environment Configurations
 WEBEX_CLIENT_ID = os.getenv("WEBEX_CLIENT_ID", "YOUR_WEBEX_CLIENT_ID")
 WEBEX_CLIENT_SECRET = os.getenv("WEBEX_CLIENT_SECRET", "YOUR_WEBEX_CLIENT_SECRET")
 WEBEX_REDIRECT_URI = os.getenv("WEBEX_REDIRECT_URI", "https://smartwave.matthiasg.dev/oauth/callback")
@@ -57,10 +68,9 @@ CAMERA_IMAGE_DIR = "storage/dishPhotos"
 os.makedirs(CAMERA_IMAGE_DIR, exist_ok=True)
 
 # ---------------------------------------------------------
-# Classes
+# Integrations Setup
 # ---------------------------------------------------------
 microwave_cook_planner = MicrowaveCookPlanner()
-# Instantiate Webex Manager
 webex_manager = WebexManager(
     db_collection=webex_tokens_collection,
     client_id=WEBEX_CLIENT_ID,
@@ -71,60 +81,110 @@ webex_manager = WebexManager(
 )
 shodan_auditor = ShodanAuditor()
 
-# -------------------------------------------------------------
-# Cron Scheduler Setup
-# -------------------------------------------------------------
+# ---------------------------------------------------------
+# Cron Scheduler (Multi-Worker Safe)
+# ---------------------------------------------------------
 scheduler = BackgroundScheduler(daemon=True)
 
-# Job 1: Server CVE audit every night at 00:00 UTC
-scheduler.add_job(
-    func=job_server_cve_audit,
-    args=[shodan_auditor, db],
-    trigger="cron",
-    hour=0,
-    minute=0,
-    id="server_cve_audit_job"
-)
-
-# Job 2: Client IP Shodan audit every 6 hours
-scheduler.add_job(
-    func=job_client_ip_audit,
-    args=[shodan_auditor, db],
-    trigger="cron",
-    hour="*/6",
-    minute=15,
-    id="client_ip_audit_job"
-)
-
-# Job 3: Request telemetry runs AFTER the client audit (e.g., every 12 hours)
-scheduler.add_job(
-    func=job_request_telemetry,
-    args=[send_command],
-    trigger="cron",
-    hour="1,13",
-    minute=0,
-    id="request_telemetry_job"
-)
-
-scheduler.start()
-
-# ---------------------------------------------------------
-# OAuth Routes
-# ---------------------------------------------------------
-
-@app.route("/oauth/callback")
-def oauth_callback():
-    """OAuth redirect endpoint that receives the authorization code."""
-    code = request.args.get("code")
-    if not code:
-        return jsonify({"error": "Missing code parameter"}), 400
-
+def start_scheduler_once():
+    """Ensures only ONE Gunicorn worker process runs the cron scheduler."""
+    lock_file_path = "/tmp/scheduler.lock"
+    
+    # Open or create a lock file
+    lock_file = open(lock_file_path, "wb")
+    
     try:
-        webex_manager.exchange_code(code)
-        return jsonify({"status": "success", "message": "Webex tokens stored successfully in MongoDB!"}), 200
-    except Exception as e:
-        current_app.logger.exception("Failed to exchange OAuth code")
-        return jsonify({"error": f"OAuth exchange failed: {str(e)}"}), 500
+        # Request a non-blocking exclusive lock
+        fcntl.flock(lock_file, fcntl.LOCK_EX | fcntl.LOCK_NB)
+        
+        # Register job schedules
+        scheduler.add_job(
+            func=job_server_cve_audit,
+            args=[shodan_auditor, db],
+            trigger="cron",
+            hour=0,
+            minute=0,
+            id="server_cve_audit_job",
+            replace_existing=True
+        )
+
+        scheduler.add_job(
+            func=job_client_ip_audit,
+            args=[shodan_auditor, db],
+            trigger="cron",
+            hour="*/6",
+            minute=15,
+            id="client_ip_audit_job",
+            replace_existing=True
+        )
+
+        scheduler.add_job(
+            func=job_request_telemetry,
+            args=[send_command],
+            trigger="cron",
+            hour="1,13",
+            minute=0,
+            id="request_telemetry_job",
+            replace_existing=True
+        )
+
+        scheduler.start()
+        print(f"[Cron] Scheduler started successfully in Worker PID {os.getpid()}")
+
+        # Ensure lock release on shutdown
+        def cleanup():
+            try:
+                fcntl.flock(lock_file, fcntl.LOCK_UN)
+                lock_file.close()
+            except Exception:
+                pass
+
+        atexit.register(cleanup)
+
+    except (IOError, OSError):
+        # Lock acquired by another worker - skip starting scheduler
+        print(f"[Cron] Worker PID {os.getpid()} skipped scheduler (already running in another worker).")
+
+# Initialize single-instance scheduler
+start_scheduler_once()
+
+# ---------------------------------------------------------
+# Authentication Middleware
+# ---------------------------------------------------------
+EXEMPT_ROUTES = {'hello_world', 'oauth_callback', 'odata_metadata'}
+
+@app.before_request
+def authenticate_request():
+    if request.endpoint in EXEMPT_ROUTES or request.method == 'OPTIONS':
+        return
+
+    # Extract API Key from Header (X-API-Key or Bearer token)
+    api_key = request.headers.get("X-API-Key")
+    if not api_key:
+        auth_header = request.headers.get("Authorization", "")
+        if auth_header.startswith("Bearer "):
+            api_key = auth_header.split(" ")[1]
+
+    if not api_key:
+        return jsonify({
+            "@odata.error": {
+                "code": "401",
+                "message": "Unauthorized: Missing API Key header"
+            }
+        }), 401
+
+    # Validate key against 'devices_authentication' collection
+    device_auth = db.devices_authentication.find_one({"api_key": api_key})
+    if not device_auth:
+        return jsonify({
+            "@odata.error": {
+                "code": "401",
+                "message": "Unauthorized: Invalid API Key"
+            }
+        }), 401
+
+    # Attach device context (works for both Microwaves and Node-RED)
+    g.device_id = device_auth.get("device_id")
 
 # ---------------------------------------------------------
 # Application Routes
@@ -133,114 +193,130 @@ def oauth_callback():
 @app.route("/")
 def hello_world():
     gen = generate(prompt="Say Hello, to the user !")
-    print(gen)
     return f"<p>{gen}</p>"
 
 
+@app.route("/oauth/callback")
+def oauth_callback():
+    code = request.args.get("code")
+    if not code:
+        return jsonify({"error": "Missing code parameter"}), 400
+
+    try:
+        webex_manager.exchange_code(code)
+        return jsonify({"status": "success", "message": "Webex tokens stored successfully!"}), 200
+    except Exception as e:
+        current_app.logger.exception("Failed to exchange OAuth code")
+        return jsonify({"error": "OAuth exchange failed"}), 500
+
+
 @app.route("/cooking-params", methods=["POST"])
 async def cooking_params():
     try:
         data = request.get_json()
-        microwave_id = data.get("microwave_id", "unknown")
+        if not data or not isinstance(data, dict):
+            return jsonify({"@odata.error": {"code": "400", "message": "Invalid payload"}}), 400
+
+        data["microwave_id"] = g.device_id
+        
+        forwarded_for = request.headers.get('X-Forwarded-For')
+        client_ip = forwarded_for.split(',')[0].strip() if forwarded_for else request.remote_addr
         
-        client_ip = request.headers.get('X-Forwarded-For', request.remote_addr).split(',')[0].strip()
         device_ip_collection.insert_one({
-            "microwave_id": microwave_id,
+            "microwave_id": g.device_id,
             "client_ip": client_ip,
             "received_at": datetime.now(timezone.utc)
         })
-        
-        if not data:
-            return jsonify({"error": "Invalid or missing JSON payload"}), 400
 
-        # Extract user or device parameters
         height_cm = float(data.get("dish_height", 4.0))
         initial_temp_c = float(data.get("ir_initial_temp", 20.0))
         microwave_wattage = int(data.get("microwave_wattage", 900))
         defrost_mode = bool(data.get("defrost_mode", False))
 
-        # 1. Save Camera Image
         camera_image_b64 = data.get("camera_image")
         if not camera_image_b64:
-            return jsonify({"error": "Missing required field 'camera_image'"}), 400
+            return jsonify({"@odata.error": {"code": "400", "message": "Missing camera_image"}}), 400
 
         filename = f"dish_{uuid.uuid4().hex}.jpg"
         filepath = os.path.join(CAMERA_IMAGE_DIR, filename)
         
-        try:
-            with open(filepath, "wb") as f:
-                f.write(base64.b64decode(camera_image_b64))
-            data["camera_image"] = filepath
-        except Exception as e:
-            current_app.logger.exception("Failed to save camera image")
-            return jsonify({"error": f"Failed to save camera image: {str(e)}"}), 500
+        with open(filepath, "wb") as f:
+            f.write(base64.b64decode(camera_image_b64))
+        data["camera_image"] = filepath
 
-        # 2. Run Vision Safety Check & Cook Planner Concurrently
-        try:
-            if getattr(config, "DEBUG_DANGEROUS_AREA", False):
-                print(f"[Debug] Running safety check on predefined image")
-                safety_task = asyncio.to_thread(safety_checker.check_dish_safety, os.path.join(CAMERA_IMAGE_DIR, "dish_0de0ee1dab8949fc8e78796947e24ed3.jpg"))
-            elif getattr(config, "DEBUG", False):
-                safety_task = asyncio.to_thread(safety_checker.check_dish_safety, os.path.join("microwaveDish.jpg"))
-            else:
-                safety_task = asyncio.to_thread(safety_checker.check_dish_safety, filepath)
-            planner_task = asyncio.to_thread(
-                microwave_cook_planner.generate_plan,
-                image_path=filepath,
-                height_cm=height_cm,
-                initial_temp_c=initial_temp_c,
-                microwave_wattage=microwave_wattage,
-                defrost_mode=defrost_mode
-            )
+        # Concurrent AI Execution
+        safety_task = asyncio.to_thread(safety_checker.check_dish_safety, filepath)
+        planner_task = asyncio.to_thread(
+            microwave_cook_planner.generate_plan,
+            image_path=filepath,
+            height_cm=height_cm,
+            initial_temp_c=initial_temp_c,
+            microwave_wattage=microwave_wattage,
+            defrost_mode=defrost_mode
+        )
 
-            # Execute both concurrently and await results
-            safety_result, cook_plan = await asyncio.gather(safety_task, planner_task)
+        safety_result, cook_plan = await asyncio.gather(safety_task, planner_task)
 
-        except Exception as e:
-            current_app.logger.exception("Exception during safety check or cook planning")
-            return jsonify({"error": f"Task execution failed: {str(e)}"}), 500
-
-
-        # 4. Attach Cooking Plan & safety check and Save to MongoDB
         data["safety_check"] = safety_result
         data["analysis_results"] = cook_plan
 
-        try:
-            cooking_collection.insert_one(data)
-            data.pop("_id", None)
-        except Exception as e:
-            return jsonify({"error": f"Database error: {str(e)}"}), 500
+        inserted = cooking_collection.insert_one(data)
+        doc_id = str(inserted.inserted_id)
+
+        # Base OData v4 response wrapper
+        odata_response = {
+            "@odata.context": f"{request.host_url.rstrip('/')}/$metadata#CookingParams/$entity",
+            "@odata.id": f"{request.host_url.rstrip('/')}/cooking-params('{doc_id}')",
+            "id": doc_id,
+            "plan": cook_plan
+        }
 
-        # 3. Evaluate Safety Result
         if not safety_result.get("is_safe", True):
-            current_app.logger.warning(f"Unsafe dish detected: {safety_result}")
-            return jsonify({
-                "error": "Safety hazard detected in microwave area",
+            odata_response.update({
                 "is_safe": False,
                 "warning_message": safety_result.get("warning_message", "Unsafe materials detected."),
                 "detected_hazards": safety_result.get("detected_hazards", [])
-            }), 200
+            })
+            return jsonify(odata_response), 200
+
+        return jsonify(odata_response), 201
 
-        return jsonify(cook_plan), 201
     except Exception as e:
-        current_app.logger.exception("Exception in /cooking-params")
-
+        current_app.logger.exception("Error in /cooking-params")
+        return jsonify({"@odata.error": {"code": "500", "message": "Internal processing error"}}), 500
 
 @app.route("/alert", methods=["POST"])
 def alert():
-    data = request.get_json() or {}
-    
-    # 1. Inject UTC timestamp
+    data = request.get_json()
+    if data is None or not isinstance(data, dict):
+        return jsonify({
+            "@odata.error": {
+                "code": "400",
+                "message": "Invalid or missing JSON payload"
+            }
+        }), 400
+
+    # Auto-populate or override orchestrator_id using authenticated device context
+    orchestrator_id = data.get("orchestrator_id") or getattr(g, "device_id", None)
+    data["orchestrator_id"] = orchestrator_id
     data["created_at"] = datetime.now(timezone.utc)
-    saved_alert = alert_collection.insert_one(data)
-    
-    orchestrator_id = data.get("orchestrator_id")
-    
+
+    try:
+        saved_alert = alert_collection.insert_one(data)
+        doc_id = str(saved_alert.inserted_id)
+    except Exception as e:
+        current_app.logger.exception("Failed to insert alert into database")
+        return jsonify({
+            "@odata.error": {
+                "code": "500",
+                "message": "Database write failed"
+            }
+        }), 500
+
     alert_info = data.get("alert", {})
     alert_type = alert_info.get("type", "Unknown")
     alert_message = alert_info.get("message", "No message provided")
-    
-    # --- GET CLIENT METADATA ---
+
     client_name = f"Unknown Client (Orchestrator {orchestrator_id})" if orchestrator_id else "Unknown Client"
     client_email = None
     client_phone = None
@@ -259,14 +335,12 @@ def alert():
             client_name = client_doc.get("client_name", client_name)
             contact_info = client_doc.get("contact_info", {})
             client_email = contact_info.get("email")
-            client_phone = contact_info.get("phone")  # Extract phone number for Twilio
+            client_phone = contact_info.get("phone")
 
-    # --- WEBEX ROOM LOGIC ---
     webex_room_id = None
     room_title = f"Support - {client_name}"
     room_link = None
     webex_status = "skipped"
-    # --- TWILIO SMS LOGIC ---
     sms_sent = False
 
     three_minutes_ago = datetime.now(timezone.utc) - timedelta(minutes=3)
@@ -276,7 +350,7 @@ def alert():
         "webex_room_id": {"$exists": True, "$ne": None},
         "created_at": {"$gte": three_minutes_ago},
         "_id": {"$ne": saved_alert.inserted_id}
-    }, sort=[("created_at", pymongo.DESCENDING)])
+    }, sort=[("created_at", DESCENDING)])
 
     if recent_alert:
         webex_room_id = recent_alert["webex_room_id"]
@@ -286,15 +360,14 @@ def alert():
                 room_id=webex_room_id,
                 alert_type=alert_type,
                 alert_message=alert_message,
-                alert_id=str(saved_alert.inserted_id),
+                alert_id=doc_id,
                 added_alert_info=True
             )
             webex_status = "reused_room"
-            room_link = f"https://web.webex.com/spaces/{webex_room_id}"
+            room_link = recent_alert.get("webex_room_link") or f"https://web.webex.com/spaces/{webex_room_id}"
         except Exception as e:
-            current_app.logger.exception("Failed to send follow-up message to existing Webex room")
+            current_app.logger.exception("Failed to send follow-up message to Webex room")
             webex_status = f"message_failed: {str(e)}"
-    
     else:
         try:
             room_details = webex_manager.create_support_room(
@@ -302,25 +375,22 @@ def alert():
                 client_email,
                 alert_type,
                 alert_message,
-                str(saved_alert.inserted_id)
+                doc_id
             )
             
             if isinstance(room_details, dict):
                 webex_room_id = room_details.get("id")
                 room_title = room_details.get("title", room_title)
-                # Set room_link if your webex_manager returns meetingLink or custom URL
                 room_link = room_details.get("meetingLink") or f"https://web.webex.com/spaces/{webex_room_id}"
             else:
                 webex_room_id = room_details
                 room_link = f"https://web.webex.com/spaces/{webex_room_id}"
 
             webex_status = "created_new_room"
-    
         except Exception as e:
             current_app.logger.exception("Failed to create Webex support room")
             webex_status = f"creation_failed: {str(e)}"
-            
-        # --- SEND SMS ---
+
         if webex_room_id and client_phone and not SAVEUP_TWILIO_API_TOKEN:
             sms_sent = send_alert_sms(
                 to_phone=client_phone,
@@ -328,72 +398,92 @@ def alert():
                 room_link=room_link,
                 client_email=client_email
             )     
-        
-    # Update document with room and sms details
-    if webex_room_id:
-        alert_collection.update_one(
-            {"_id": saved_alert.inserted_id}, 
-            {"$set": {"webex_room_id": webex_room_id, "webex_room_title": room_title, "webex_room_link": room_link, "sms_sent": sms_sent}}
-        )
-    else: # Just save the sms
-        alert_collection.update_one(
-            {"_id": saved_alert.inserted_id}, 
-            {"$set": {"sms_sent": sms_sent}}
-        )
 
+    update_fields = {"sms_sent": sms_sent}
+    if webex_room_id:
+        update_fields.update({
+            "webex_room_id": webex_room_id,
+            "webex_room_title": room_title,
+            "webex_room_link": room_link
+        })
+
+    alert_collection.update_one({"_id": saved_alert.inserted_id}, {"$set": update_fields})
+
+    # OData v4 Created Response Payload
     return jsonify({
-        "status": "success", 
-        "message": "Alert saved", 
+        "@odata.context": f"{request.host_url.rstrip('/')}/$metadata#Alerts/$entity",
+        "@odata.id": f"{request.host_url.rstrip('/')}/alert('{doc_id}')",
+        "id": doc_id,
+        "status": "success",
+        "message": "Alert saved",
+        "orchestrator_id": orchestrator_id,
         "webex_room_id": webex_room_id,
         "webex_room_url": room_link,
         "webex_status": webex_status,
         "sms_sent": sms_sent
-    }), 200
-
+    }), 201
 
 @app.route("/telemetry", methods=["POST"])
 def telemetry():
     data = request.get_json()
-    
     if data is None:
-        return jsonify({"error": "Invalid or missing JSON payload"}), 400
+        return jsonify({"@odata.error": {"code": "400", "message": "Invalid JSON payload"}}), 400
 
-    # If the payload was double-encoded as a string, deserialize it
     if isinstance(data, str):
         try:
             data = json.loads(data)
         except (json.JSONDecodeError, TypeError):
-            return jsonify({"error": "String payload could not be parsed as JSON"}), 400
+            return jsonify({"@odata.error": {"code": "400", "message": "String payload invalid"}}), 400
 
-    if not isinstance(data, dict):
-        return jsonify({"error": "Expected a JSON object/dictionary"}), 400
-
-    # Stamp UTC timestamp for Node-RED queries
+    data["device_id"] = g.device_id
     data["received_at"] = datetime.now(timezone.utc).isoformat()
 
     try:
-        telemetry_collection.insert_one(data)
-        return jsonify({"status": "success", "message": "Telemetry saved"}), 200
-        
-    except Exception as e:
-        return jsonify({"error": f"Database error: {str(e)}"}), 500
+        inserted = telemetry_collection.insert_one(data)
+        doc_id = str(inserted.inserted_id)
 
-# -------------------------------------------------------------
-# Server CVE & SSL Audit Endpoint
-# -------------------------------------------------------------
-@app.route('/api/security/cve-audit', methods=['GET'])
+        # OData v4 Created Response Envelope
+        return jsonify({
+            "@odata.context": f"{request.host_url.rstrip('/')}/$metadata#Telemetry/$entity",
+            "@odata.id": f"{request.host_url.rstrip('/')}/telemetry('{doc_id}')",
+            "id": doc_id,
+            "status": "success",
+            "message": "Telemetry saved",
+            "device_id": g.device_id,
+            "received_at": data["received_at"]
+        }), 201
+
+    except Exception as e:
+        current_app.logger.exception("Database write failed")
+        return jsonify({"@odata.error": {"code": "500", "message": "Database write failed"}}), 500
+
+
+@app.route('/api/security/cve-audit', methods=['POST', 'GET'])
 def run_cve_audit():
-    """Runs a vulnerability and SSL audit against this server."""
+    """Protected endpoint triggered by Node-RED using REST API + API Key."""
     audit_results = shodan_auditor.audit_server_vulnerabilities()
     
-    cve_audit_results.insert_one({
+    inserted = cve_audit_results.insert_one({
+        "triggered_by": g.device_id,
         "audit_results": audit_results,
         "timestamp": datetime.now(timezone.utc)
     })
+    doc_id = str(inserted.inserted_id)
     
-    status_code = 200 if audit_results["status"] == "PASS" else 409
-    return jsonify(audit_results), status_code
+    status_code = 200 if audit_results.get("status") == "PASS" else 409
+    
+    return jsonify({
+        "@odata.context": f"{request.host_url.rstrip('/')}/$metadata#CveAudit/$entity",
+        "@odata.id": f"{request.host_url.rstrip('/')}/api/security/cve-audit('{doc_id}')",
+        "id": doc_id,
+        "status": audit_results.get("status"),
+        "audit_results": audit_results,
+        "timestamp": datetime.now(timezone.utc).isoformat()
+    }), status_code
 
+# ---------------------------------------------------------
+# Debug Endpoints (Protected)
+# ---------------------------------------------------------
 
 @app.route("/debug/telemetryrequest", methods=["GET"])
 def debug_telemetryrequest():
@@ -413,7 +503,8 @@ def debug_telemetryrequest():
         }), 200
     except Exception as e:
         return jsonify({"error": f"Failed to publish MQTT command: {str(e)}"}), 500
-    
+
+
 @app.route('/debug/run-job/<job_id>', methods=['POST', 'GET'])
 def trigger_job_manually(job_id):
     """Manually triggers any scheduled job immediately by its ID."""
@@ -424,7 +515,6 @@ def trigger_job_manually(job_id):
             "available_jobs": [j.id for j in scheduler.get_jobs()]
         }), 404
 
-    # Execute the underlying function with its configured arguments
     try:
         job.func(*job.args)
         return jsonify({
@@ -436,10 +526,51 @@ def trigger_job_manually(job_id):
             "status": "error",
             "message": f"Job execution failed: {str(e)}"
         }), 500
-    
-@app.route("/debug", methods=["GET"])
-def debug():
-    return safety_checker.check_dish_safety(os.path.join(CAMERA_IMAGE_DIR, "dish_0de0ee1dab8949fc8e78796947e24ed3.jpg"))
+
+# ---------------------------------------------------------
+# OData Metadata Definition
+# ---------------------------------------------------------
+@app.route("/$metadata", methods=["GET"])
+def odata_metadata():
+    """Provides mandatory OData schema definition for validation."""
+    xml_metadata = """<?xml version="1.0" encoding="utf-8"?>
+<edmx:Edmx Version="4.0" xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx">
+  <edmx:DataServices>
+    <Schema Namespace="MicrowaveNetwork" xmlns="http://docs.oasis-open.org/odata/ns/edm">
+      <EntityType Name="Telemetry">
+        <Key><PropertyRef Name="id"/></Key>
+        <Property Name="id" Type="Edm.String" Nullable="false"/>
+        <Property Name="device_id" Type="Edm.String"/>
+        <Property Name="received_at" Type="Edm.DateTimeOffset"/>
+      </EntityType>
+      <EntityType Name="CookingParams">
+        <Key><PropertyRef Name="id"/></Key>
+        <Property Name="id" Type="Edm.String" Nullable="false"/>
+        <Property Name="microwave_id" Type="Edm.String"/>
+      </EntityType>
+      <EntityType Name="CveAudit">
+        <Key><PropertyRef Name="id"/></Key>
+        <Property Name="id" Type="Edm.String" Nullable="false"/>
+        <Property Name="status" Type="Edm.String"/>
+      </EntityType>
+      <EntityType Name="Alert">
+        <Key><PropertyRef Name="id"/></Key>
+        <Property Name="id" Type="Edm.String" Nullable="false"/>
+        <Property Name="orchestrator_id" Type="Edm.String"/>
+        <Property Name="webex_room_id" Type="Edm.String"/>
+        <Property Name="webex_status" Type="Edm.String"/>
+        <Property Name="sms_sent" Type="Edm.Boolean"/>
+    </EntityType>
+      <EntityContainer Name="Container">
+        <EntitySet Name="Telemetry" EntityType="MicrowaveNetwork.Telemetry"/>
+        <EntitySet Name="CookingParams" EntityType="MicrowaveNetwork.CookingParams"/>
+        <EntitySet Name="CveAudit" EntityType="MicrowaveNetwork.CveAudit"/>
+        <EntitySet Name="Alerts" EntityType="MicrowaveNetwork.Alert"/>
+      </EntityContainer>
+    </Schema>
+  </edmx:DataServices>
+</edmx:Edmx>"""
+    return Response(xml_metadata, mimetype="application/xml")
 
 
 if __name__ == "__main__":