Added a FileField and an ImageField (copied from django.forms.fields).

Adjusted generics, mixins and serializers to take a `files` arg where applicable.

rest_framework/fields.py

@@ -904,3 +904,94 @@ class FloatField(WritableField):
         except (TypeError, ValueError):
             msg = self.error_messages['invalid'] % value
             raise ValidationError(msg)
+
+
+class FileField(WritableField):
+    type_name = 'FileField'
+
+    default_error_messages = {
+        'invalid': _("No file was submitted. Check the encoding type on the form."),
+        'missing': _("No file was submitted."),
+        'empty': _("The submitted file is empty."),
+        'max_length': _('Ensure this filename has at most %(max)d characters (it has %(length)d).'),
+        'contradiction': _('Please either submit a file or check the clear checkbox, not both.')
+    }
+
+    def __init__(self, *args, **kwargs):
+        self.max_length = kwargs.pop('max_length', None)
+        self.allow_empty_file = kwargs.pop('allow_empty_file', False)
+        super(FileField, self).__init__(*args, **kwargs)
+
+    def from_native(self, data):
+        if data in validators.EMPTY_VALUES:
+            return None
+
+        # UploadedFile objects should have name and size attributes.
+        try:
+            file_name = data.name
+            file_size = data.size
+        except AttributeError:
+            raise ValidationError(self.error_messages['invalid'])
+
+        if self.max_length is not None and len(file_name) > self.max_length:
+            error_values = {'max': self.max_length, 'length': len(file_name)}
+            raise ValidationError(self.error_messages['max_length'] % error_values)
+        if not file_name:
+            raise ValidationError(self.error_messages['invalid'])
+        if not self.allow_empty_file and not file_size:
+            raise ValidationError(self.error_messages['empty'])
+
+        return data
+
+    def to_native(self, value):
+        """
+        No need to return anything, the file can be accessed form its url.
+        """
+        return
+
+
+class ImageField(FileField):
+    default_error_messages = {
+        'invalid_image': _("Upload a valid image. The file you uploaded was either not an image or a corrupted image."),
+    }
+
+    def from_native(self, data):
+        """
+        Checks that the file-upload field data contains a valid image (GIF, JPG,
+        PNG, possibly others -- whatever the Python Imaging Library supports).
+        """
+        f = super(ImageField, self).from_native(data)
+        if f is None:
+            return None
+
+        # Try to import PIL in either of the two ways it can end up installed.
+        try:
+            from PIL import Image
+        except ImportError:
+            import Image
+
+        # We need to get a file object for PIL. We might have a path or we might
+        # have to read the data into memory.
+        if hasattr(data, 'temporary_file_path'):
+            file = data.temporary_file_path()
+        else:
+            if hasattr(data, 'read'):
+                file = BytesIO(data.read())
+            else:
+                file = BytesIO(data['content'])
+
+        try:
+            # load() could spot a truncated JPEG, but it loads the entire
+            # image in memory, which is a DoS vector. See #3848 and #18520.
+            # verify() must be called immediately after the constructor.
+            Image.open(file).verify()
+        except ImportError:
+            # Under PyPy, it is possible to import PIL. However, the underlying
+            # _imaging C module isn't available, so an ImportError will be
+            # raised. Catch and re-raise.
+            raise
+        except Exception: # Python Imaging Library doesn't recognize it as an image
+            raise ValidationError(self.error_messages['invalid_image'])
+        if hasattr(f, 'seek') and callable(f.seek):
+            f.seek(0)
+        return f

rest_framework/generics.py

@@ -44,11 +44,10 @@ class GenericAPIView(views.APIView):
         return serializer_class
 
     def get_serializer(self, instance=None, data=None, files=None):
-        # TODO: add support for files
         # TODO: add support for seperate serializer/deserializer
         serializer_class = self.get_serializer_class()
         context = self.get_serializer_context()
-        return serializer_class(instance, data=data, context=context)
+        return serializer_class(instance, data=data, files=files, context=context)
 
 
 class MultipleObjectAPIView(MultipleObjectMixin, GenericAPIView):

rest_framework/mixins.py

@@ -15,7 +15,7 @@ class CreateModelMixin(object):
     Should be mixed in with any `BaseView`.
     """
     def create(self, request, *args, **kwargs):
-        serializer = self.get_serializer(data=request.DATA)
+        serializer = self.get_serializer(data=request.DATA, files=request.FILES)
         if serializer.is_valid():
             self.pre_save(serializer.object)
             self.object = serializer.save()
@@ -80,7 +80,7 @@ class UpdateModelMixin(object):
             self.object = None
             success_status = status.HTTP_201_CREATED
 
-        serializer = self.get_serializer(self.object, data=request.DATA)
+        serializer = self.get_serializer(self.object, data=request.DATA, files=request.FILES)
 
         if serializer.is_valid():
             self.pre_save(serializer.object)

rest_framework/serializers.py

@@ -91,7 +91,7 @@ class BaseSerializer(Field):
     _options_class = SerializerOptions
     _dict_class = SortedDictWithMetadata  # Set to unsorted dict for backwards compatability with unsorted implementations.
 
-    def __init__(self, instance=None, data=None, context=None, **kwargs):
+    def __init__(self, instance=None, data=None, files=None, context=None, **kwargs):
         super(BaseSerializer, self).__init__(**kwargs)
         self.opts = self._options_class(self.Meta)
         self.fields = copy.deepcopy(self.base_fields)
@@ -101,9 +101,11 @@ class BaseSerializer(Field):
         self.context = context or {}
 
         self.init_data = data
+        self.init_files = files
         self.object = instance
 
         self._data = None
+        self._files = None
         self._errors = None
 
     #####
@@ -187,7 +189,7 @@ class BaseSerializer(Field):
             ret.fields[key] = field
         return ret
 
-    def restore_fields(self, data):
+    def restore_fields(self, data, files):
         """
         Core of deserialization, together with `restore_object`.
         Converts a dictionary of data into a dictionary of deserialized fields.
@@ -196,6 +198,9 @@ class BaseSerializer(Field):
         reverted_data = {}
         for field_name, field in fields.items():
             try:
+                if isinstance(field, (FileField, ImageField)):
+                    field.field_from_native(files, field_name, reverted_data)
+                else:
                     field.field_from_native(data, field_name, reverted_data)
             except ValidationError as err:
                 self._errors[field_name] = list(err.messages)
@@ -250,7 +255,7 @@ class BaseSerializer(Field):
             return [self.convert_object(item) for item in obj]
         return self.convert_object(obj)
 
-    def from_native(self, data):
+    def from_native(self, data, files):
         """
         Deserialize primatives -> objects.
         """
@@ -259,8 +264,8 @@ class BaseSerializer(Field):
             return (self.from_native(item) for item in data)
 
         self._errors = {}
-        if data is not None:
-            attrs = self.restore_fields(data)
+        if data is not None or files is not None:
+            attrs = self.restore_fields(data, files)
             attrs = self.perform_validation(attrs)
         else:
             self._errors['non_field_errors'] = ['No input provided']
@@ -288,7 +293,7 @@ class BaseSerializer(Field):
         setting self.object if no errors occurred.
         """
         if self._errors is None:
-            obj = self.from_native(self.init_data)
+            obj = self.from_native(self.init_data, self.init_files)
             if not self._errors:
                 self.object = obj
         return self._errors
@@ -440,6 +445,8 @@ class ModelSerializer(Serializer):
             models.TextField: CharField,
             models.CommaSeparatedIntegerField: CharField,
             models.BooleanField: BooleanField,
+            models.FileField: FileField,
+            models.ImageField: ImageField,
         }
         try:
             return field_mapping[model_field.__class__](**kwargs)