FileField and ImageField

requirements-test.txt

@@ -13,4 +13,3 @@ django-filter>=0.5.4
 django-oauth-plus>=2.2.1
 oauth2>=1.5.211
 django-oauth2-provider>=0.2.4
-Pillow==2.3.0

rest_framework/compat.py

@@ -84,15 +84,6 @@ except ImportError:
     from collections import UserDict
     from collections import MutableMapping as DictMixin
 
-# Try to import PIL in either of the two ways it can end up installed.
-try:
-    from PIL import Image
-except ImportError:
-    try:
-        import Image
-    except ImportError:
-        Image = None
-
 
 def get_model_name(model_cls):
     try:

rest_framework/fields.py

+from django import forms
 from django.conf import settings
 from django.core import validators
 from django.core.exceptions import ValidationError
@@ -427,8 +428,6 @@ class CharField(Field):
         return str(data)
 
     def to_representation(self, value):
-        if value is None:
-            return None
         return str(value)
 
 
@@ -446,8 +445,6 @@ class EmailField(CharField):
         return str(data).strip()
 
     def to_representation(self, value):
-        if value is None:
-            return None
         return str(value).strip()
 
 
@@ -513,8 +510,6 @@ class IntegerField(Field):
         return data
 
     def to_representation(self, value):
-        if value is None:
-            return None
         return int(value)
 
 
@@ -543,8 +538,6 @@ class FloatField(Field):
             self.fail('invalid')
 
     def to_representation(self, value):
-        if value is None:
-            return None
         return float(value)
 
 
@@ -616,9 +609,6 @@ class DecimalField(Field):
         return value
 
     def to_representation(self, value):
-        if value in (None, ''):
-            return None
-
         if not isinstance(value, decimal.Decimal):
             value = decimal.Decimal(str(value).strip())
 
@@ -689,7 +679,7 @@ class DateTimeField(Field):
         self.fail('invalid', format=humanized_format)
 
     def to_representation(self, value):
-        if value is None or self.format is None:
+        if self.format is None:
             return value
 
         if self.format.lower() == ISO_8601:
@@ -741,7 +731,7 @@ class DateField(Field):
         self.fail('invalid', format=humanized_format)
 
     def to_representation(self, value):
-        if value is None or self.format is None:
+        if self.format is None:
             return value
 
         # Applying a `DateField` to a datetime value is almost always
@@ -795,7 +785,7 @@ class TimeField(Field):
         self.fail('invalid', format=humanized_format)
 
     def to_representation(self, value):
-        if value is None or self.format is None:
+        if self.format is None:
             return value
 
         # Applying a `TimeField` to a datetime value is almost always
@@ -875,14 +865,68 @@ class MultipleChoiceField(ChoiceField):
 # File types...
 
 class FileField(Field):
-    pass  # TODO
+    default_error_messages = {
+        'required': _("No file was submitted."),
+        'invalid': _("The submitted data was not a file. Check the encoding type on the form."),
+        'no_name': _("No filename could be determined."),
+        'empty': _("The submitted file is empty."),
+        'max_length': _('Ensure this filename has at most {max_length} characters (it has {length}).'),
+    }
+    use_url = api_settings.UPLOADED_FILES_USE_URL
 
+    def __init__(self, *args, **kwargs):
+        self.max_length = kwargs.pop('max_length', None)
+        self.allow_empty_file = kwargs.pop('allow_empty_file', False)
+        self.use_url = kwargs.pop('use_url', self.use_url)
+        super(FileField, self).__init__(*args, **kwargs)
 
-class ImageField(Field):
-    pass  # TODO
+    def to_internal_value(self, data):
+        try:
+            # `UploadedFile` objects should have name and size attributes.
+            file_name = data.name
+            file_size = data.size
+        except AttributeError:
+            self.fail('invalid')
 
+        if not file_name:
+            self.fail('no_name')
+        if not self.allow_empty_file and not file_size:
+            self.fail('empty')
+        if self.max_length and len(file_name) > self.max_length:
+            self.fail('max_length', max_length=self.max_length, length=len(file_name))
 
-# Advanced field types...
+        return data
+
+    def to_representation(self, value):
+        if self.use_url:
+            return settings.MEDIA_URL + value.url
+        return value.name
+
+
+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 __init__(self, *args, **kwargs):
+        self._DjangoImageField = kwargs.pop('_DjangoImageField', forms.ImageField)
+        super(ImageField, self).__init__(*args, **kwargs)
+
+    def to_internal_value(self, data):
+        # Image validation is a bit grungy, so we'll just outright
+        # defer to Django's implementation so we don't need to
+        # consider it, or treat PIL as a test dependancy.
+        file_object = super(ImageField, self).to_internal_value(data)
+        django_field = self._DjangoImageField()
+        django_field.error_messages = self.error_messages
+        django_field.to_python(file_object)
+        return file_object
+
+
+# Composite field types...
 
 class ListField(Field):
     child = None
@@ -922,6 +966,8 @@ class ListField(Field):
         return [self.child.to_representation(item) for item in data]
 
 
+# Miscellaneous field types...
+
 class ReadOnlyField(Field):
     """
     A read-only field that simply returns the field value.

rest_framework/settings.py

@@ -110,7 +110,8 @@ DEFAULTS = {
     # Encoding
     'UNICODE_JSON': True,
     'COMPACT_JSON': True,
-    'COERCE_DECIMAL_TO_STRING': True
+    'COERCE_DECIMAL_TO_STRING': True,
+    'UPLOADED_FILES_USE_URL': True
 }
 
 

tests/test_fields.py

 from decimal import Decimal
+from django.core.exceptions import ValidationError
 from django.utils import timezone
 from rest_framework import fields, serializers
 import datetime
@@ -516,7 +517,7 @@ class TestDecimalField(FieldValues):
         Decimal('1.0'): '1.0',
         Decimal('0.0'): '0.0',
         Decimal('1.09'): '1.1',
-        Decimal('0.04'): '0.0',
+        Decimal('0.04'): '0.0'
     }
     field = fields.DecimalField(max_digits=3, decimal_places=1)
 
@@ -576,7 +577,7 @@ class TestDateField(FieldValues):
         datetime.datetime(2001, 1, 1, 12, 00): ['Expected a date but got a datetime.'],
     }
     outputs = {
-        datetime.date(2001, 1, 1): '2001-01-01',
+        datetime.date(2001, 1, 1): '2001-01-01'
     }
     field = fields.DateField()
 
@@ -639,7 +640,7 @@ class TestDateTimeField(FieldValues):
     }
     outputs = {
         datetime.datetime(2001, 1, 1, 13, 00): '2001-01-01T13:00:00',
-        datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()): '2001-01-01T13:00:00Z',
+        datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()): '2001-01-01T13:00:00Z'
     }
     field = fields.DateTimeField(default_timezone=timezone.UTC())
 
@@ -847,6 +848,92 @@ class TestMultipleChoiceField(FieldValues):
     )
 
 
+# File fields...
+
+class MockFile:
+    def __init__(self, name='', size=0, url=''):
+        self.name = name
+        self.size = size
+        self.url = url
+
+    def __eq__(self, other):
+        return (
+            isinstance(other, MockFile) and
+            self.name == other.name and
+            self.size == other.size and
+            self.url == other.url
+        )
+
+
+class TestFileField(FieldValues):
+    """
+    Values for `FileField`.
+    """
+    valid_inputs = [
+        (MockFile(name='example', size=10), MockFile(name='example', size=10))
+    ]
+    invalid_inputs = [
+        ('invalid', ['The submitted data was not a file. Check the encoding type on the form.']),
+        (MockFile(name='example.txt', size=0), ['The submitted file is empty.']),
+        (MockFile(name='', size=10), ['No filename could be determined.']),
+        (MockFile(name='x' * 100, size=10), ['Ensure this filename has at most 10 characters (it has 100).'])
+    ]
+    outputs = [
+        (MockFile(name='example.txt', url='/example.txt'), '/example.txt')
+    ]
+    field = fields.FileField(max_length=10)
+
+
+class TestFieldFieldWithName(FieldValues):
+    """
+    Values for `FileField` with a filename output instead of URLs.
+    """
+    valid_inputs = {}
+    invalid_inputs = {}
+    outputs = [
+        (MockFile(name='example.txt', url='/example.txt'), 'example.txt')
+    ]
+    field = fields.FileField(use_url=False)
+
+
+# Stub out mock Django `forms.ImageField` class so we don't *actually*
+# call into it's regular validation, or require PIL for testing.
+class FailImageValidation(object):
+    def to_python(self, value):
+        raise ValidationError(self.error_messages['invalid_image'])
+
+
+class PassImageValidation(object):
+    def to_python(self, value):
+        return value
+
+
+class TestInvalidImageField(FieldValues):
+    """
+    Values for an invalid `ImageField`.
+    """
+    valid_inputs = {}
+    invalid_inputs = [
+        (MockFile(name='example.txt', size=10), ['Upload a valid image. The file you uploaded was either not an image or a corrupted image.'])
+    ]
+    outputs = {}
+    field = fields.ImageField(_DjangoImageField=FailImageValidation)
+
+
+class TestValidImageField(FieldValues):
+    """
+    Values for an valid `ImageField`.
+    """
+    valid_inputs = [
+        (MockFile(name='example.txt', size=10), MockFile(name='example.txt', size=10))
+    ]
+    invalid_inputs = {}
+    outputs = {}
+    field = fields.ImageField(_DjangoImageField=PassImageValidation)
+
+
+# Composite fields...
+
 class TestListField(FieldValues):
     """
     Values for `ListField`.

tox.ini

@@ -21,7 +21,6 @@ basepython = python3.4
 deps = Django==1.7
        django-filter==0.7
        defusedxml==0.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py3.3-django1.7]
@@ -29,7 +28,6 @@ basepython = python3.3
 deps = Django==1.7
        django-filter==0.7
        defusedxml==0.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py3.2-django1.7]
@@ -37,7 +35,6 @@ basepython = python3.2
 deps = Django==1.7
        django-filter==0.7
        defusedxml==0.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py2.7-django1.7]
@@ -49,7 +46,6 @@ deps = Django==1.7
        # oauth2==1.5.211
        # django-oauth2-provider==0.2.4
        django-guardian==1.2.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py3.4-django1.6]
@@ -57,7 +53,6 @@ basepython = python3.4
 deps = Django==1.6.3
        django-filter==0.7
        defusedxml==0.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py3.3-django1.6]
@@ -65,7 +60,6 @@ basepython = python3.3
 deps = Django==1.6.3
        django-filter==0.7
        defusedxml==0.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py3.2-django1.6]
@@ -73,7 +67,6 @@ basepython = python3.2
 deps = Django==1.6.3
        django-filter==0.7
        defusedxml==0.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py2.7-django1.6]
@@ -85,7 +78,6 @@ deps = Django==1.6.3
        oauth2==1.5.211
        django-oauth2-provider==0.2.4
        django-guardian==1.2.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py2.6-django1.6]
@@ -97,7 +89,6 @@ deps = Django==1.6.3
        oauth2==1.5.211
        django-oauth2-provider==0.2.4
        django-guardian==1.2.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py3.4-django1.5]
@@ -105,7 +96,6 @@ basepython = python3.4
 deps = django==1.5.6
        django-filter==0.7
        defusedxml==0.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py3.3-django1.5]
@@ -113,7 +103,6 @@ basepython = python3.3
 deps = django==1.5.6
        django-filter==0.7
        defusedxml==0.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py3.2-django1.5]
@@ -121,7 +110,6 @@ basepython = python3.2
 deps = django==1.5.6
        django-filter==0.7
        defusedxml==0.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py2.7-django1.5]
@@ -133,7 +121,6 @@ deps = django==1.5.6
        oauth2==1.5.211
        django-oauth2-provider==0.2.3
        django-guardian==1.2.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py2.6-django1.5]
@@ -145,7 +132,6 @@ deps = django==1.5.6
        oauth2==1.5.211
        django-oauth2-provider==0.2.3
        django-guardian==1.2.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py2.7-django1.4]
@@ -157,7 +143,6 @@ deps = django==1.4.11
        oauth2==1.5.211
        django-oauth2-provider==0.2.3
        django-guardian==1.2.3
-       Pillow==2.3.0
        pytest-django==2.6.1
 
 [testenv:py2.6-django1.4]
@@ -169,5 +154,4 @@ deps = django==1.4.11
        oauth2==1.5.211
        django-oauth2-provider==0.2.3
        django-guardian==1.2.3
-       Pillow==2.3.0
        pytest-django==2.6.1