Push even more barcode decoding to the individual plugin

- DigiKey barcode is NOT json formatted, for example...

InvenTree/InvenTree/api.py

@@ -5,8 +5,6 @@ Main JSON interface views
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-import json
-
 from django.utils.translation import ugettext as _
 from django.http import JsonResponse
 
@@ -61,26 +59,9 @@ class BarcodeScanView(APIView):
         print("Barcode data:")
         print(barcode_data)
 
-        valid_data = False
-
         if barcode_data is None:
             response['error'] = _('No barcode data provided')
 
-        elif type(barcode_data) is dict:
-            valid_data = True
-
-        elif type(barcode_data) is str:
-            # Attempt to decode the barcode into a JSON object
-            try:
-                barcode_data = json.loads(barcode_data)
-                valid_data = True
-            except json.JSONDecodeError:
-                response['error'] = _('Barcode is not a JSON object')
-
-        else:
-            response['error'] = _('Barcode data is unknown format')
-
-        if valid_data:
         # Look for a barcode plugin that knows how to handle the data
         for plugin_class in barcode_plugins:
 

InvenTree/plugins/barcode/inventree.py

@@ -11,6 +11,8 @@ references model objects actually exist in the database.
 
 # -*- coding: utf-8 -*-
 
+import json
+
 from . import barcode
 
 from stock.models import StockItem, StockLocation
@@ -34,6 +36,17 @@ class InvenTreeBarcodePlugin(barcode.BarcodePlugin):
 
         """
 
+        # The data must either be dict or be able to dictified
+        if type(self.data) is dict:
+            pass
+        elif type(self.data) is str:
+            try:
+                self.data = json.loads(self.data)
+            except json.JSONDecodeError:
+                return False
+        else:
+            return False
+
         for key in ['tool', 'version']:
             if key not in self.data.keys():
                 return False