Further barcode work

- Simplify InvenTree barcode format
- Create base-clas for plugin

InvenTree/plugins/barcode/barcode.py

@@ -1,19 +1,25 @@
 # -*- coding: utf-8 -*-
 
+import plugins.plugin as plugin
 
-class BarcodePlugin:
+
+class BarcodePlugin(plugin.InvenTreePlugin):
     """
     The BarcodePlugin class is the base class for any barcode plugin.
     """
 
-    # Override this for each actual plugin
-    PLUGIN_NAME = ''
-
     def validate_barcode(self, barcode_data):
         """
         Default implementation returns False
         """
         return False
 
+    def decode_barcode(self, barcode_data):
+        """
+        Decode the barcode, and craft a response
+        """
+
+        return None
+
     def __init__(self):
-        pass
+        plugin.InvenTreePlugin.__init__(self)

InvenTree/plugins/barcode/inventree.py

@@ -8,7 +8,24 @@ class InvenTreeBarcodePlugin(barcode.BarcodePlugin):
     PLUGIN_NAME = "InvenTreeBarcodePlugin"
 
     def validate_barcode(self, barcode_data):
+        """
+        An "InvenTree" barcode must include the following tags:
 
-        print("testing")
+        {
+            'tool': 'InvenTree',
+            'version': <anything>
+        }
+
+        """
+
+        for key in ['tool', 'version']:
+            if key not in barcode_data.keys():
+                return False
+
+        if not barcode_data['tool'] == 'InvenTree':
+            return False
 
         return True
+
+    def decode_barcode(self, barcode_data):
+        pass

InvenTree/plugins/plugin.py

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+
+
+class InvenTreePlugin():
+    """
+    Base class for a Barcode plugin
+    """
+
+    # Override the plugin name for each concrete plugin instance
+    PLUGIN_NAME = ''
+
+    def get_name(self):
+        return self.PLUGIN_NAME
+
+    def __init__(self):
+        pass

InvenTree/plugins/plugins.py

@@ -52,4 +52,12 @@ def load_barcode_plugins():
     Return a list of all registered barcode plugins
     """
 
-    return get_plugins(barcode, BarcodePlugin)
+    plugins = get_plugins(barcode, BarcodePlugin)
+
+    if len(plugins) > 0:
+        print("Discovered {n} barcode plugins:".format(n=len(plugins)))
+
+        for bp in plugins:
+            print(" - {bp}".format(bp=bp.PLUGIN_NAME))
+
+    return plugins