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
 
@@ -61,49 +59,32 @@ 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
+        # Look for a barcode plugin that knows how to handle the data
+        for plugin_class in barcode_plugins:
 
-        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')
+            # Instantiate the plugin with the provided plugin data
+            plugin = plugin_class(barcode_data)
 
-        else:
-            response['error'] = _('Barcode data is unknown format')
+            if plugin.validate():
                 
-        if valid_data:
-            # Look for a barcode plugin that knows how to handle the data
-            for plugin_class in barcode_plugins:
+                # Plugin should return a dict response
+                response = plugin.decode()
                 
-                # Instantiate the plugin with the provided plugin data
-                plugin = plugin_class(barcode_data)
+                if type(response) is dict:
+                    if 'success' not in response.keys() and 'error' not in response.keys():
+                        response['success'] = _('Barcode successfully decoded')
+                else:
+                    response = {
+                        'error': _('Barcode plugin returned incorrect response')
+                    }
 
-                if plugin.validate():
+                response['plugin'] = plugin.get_name()
+                response['hash'] = plugin.hash()
 
-                    # Plugin should return a dict response
-                    response = plugin.decode()
-                    
-                    if type(response) is dict:
-                        if 'success' not in response.keys() and 'error' not in response.keys():
-                            response['success'] = _('Barcode successfully decoded')
-                    else:
-                        response = {
-                            'error': _('Barcode plugin returned incorrect response')
-                        }
-
-                    response['plugin'] = plugin.get_name()
-                    response['hash'] = plugin.hash()
-
-                    break
+                break
 
         if 'error' not in response and 'success' not in response:
             response = {

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