Implement custom to_json function for CaptureMetadata

code/iottb/models/capture_metadata_model.py

@@ -2,7 +2,7 @@ import json
 import uuid
 from datetime import datetime
 from pathlib import Path
-from typing import Optional, Any
+from typing import Optional, Any, OrderedDict
 
 from iottb.definitions import ReturnCodes, CAPTURE_METADATA_FILE
 from iottb.models.device_metadata_model import DeviceMetadata
@@ -67,5 +67,36 @@ class CaptureMetadata:
             json.dump(metadata, file)
             return ReturnCodes.SUCCESS
 
-    def to_json(self, indent):
+    def to_json(self, indent=2):
-        pass
+        # TODO: Where to validate data?
+        logger.info(f"Converting CaptureMetadata to JSON")
+        data = {}
+
+        # List of fields from CaptureData class, if fields[key]==True, then it is a required field
+        fields = {
+            'capture_id': True,  #
+            'device_id': True,
+            'capture_dir': True,
+            'capture_file': False,
+            'capture_date': False,
+            'start_time': True,
+            'stop_time': True,
+            'packet_count': False,
+            'pcap_filter': False,
+            'tcpdump_command': False,
+            'interface': False,
+            'device_ip_address': False,
+            'device_mac_address': False,
+            'app': False,
+            'app_version': False,
+            'firmware_version': False
+        }
+
+        for field, is_mandatory in fields.items():
+            value = getattr(self, field, None)
+            if value not in [None, ""] or is_mandatory:
+                if value in [None, ""] and is_mandatory:
+                    raise ValueError(f"Field {field} is required and cannot be empty.")
+                data[field] = str(value) if not isinstance(value, str) else value
+        logger.debug(f"Capture metadata: {data}")
+        return json.dumps(data, indent=indent)