Split metadata validators in validators and parsers. Move document and upload wizard metadata validation logic to model. Add metadata tests.

mayan/apps/metadata/parsers.py

@@ -0,0 +1,54 @@
+from __future__ import unicode_literals
+
+from dateutil.parser import parse
+
+from django.core.exceptions import ValidationError
+
+
+class MetadataParser(object):
+    _registry = []
+
+    @classmethod
+    def register(cls, parser):
+        cls._registry.append(parser)
+
+    @classmethod
+    def get_all(cls):
+        return cls._registry
+
+    @classmethod
+    def get_import_path(cls):
+        return cls.__module__ + '.' + cls.__name__
+
+    @classmethod
+    def get_import_paths(cls):
+        return [validator.get_import_path() for validator in cls.get_all()]
+
+    def execute(self, input_data):
+        raise NotImplementedError
+
+    def parse(self, input_data):
+        try:
+            return self.execute(input_data)
+        except Exception as exception:
+            raise ValidationError(exception)
+
+
+class DateAndTimeParser(MetadataParser):
+    def execute(self, input_data):
+        return parse(input_data).isoformat()
+
+
+class DateParser(MetadataParser):
+    def execute(self, input_data):
+        return parse(input_data).date().isoformat()
+
+
+class TimeParser(MetadataParser):
+    def execute(self, input_data):
+        return parse(input_data).time().isoformat()
+
+
+MetadataParser.register(DateAndTimeParser)
+MetadataParser.register(DateParser)
+MetadataParser.register(TimeParser)