Add better date / datetime validation (pull 2)

addition to #631 with update to master + timefield support

docs/api-guide/fields.md

@@ -185,12 +185,20 @@ Corresponds to `django.forms.fields.RegexField`
 
 A date representation.
 
+Uses `DATE_INPUT_FORMATS` to validate date.
+
+Optionally takes `format` as parameter to replace the matching pattern.
+
 Corresponds to `django.db.models.fields.DateField`
 
 ## DateTimeField
 
 A date and time representation.
 
+Uses `DATETIME_INPUT_FORMATS` to validate date_time.
+
+Optionally takes `format` as parameter to replace the matching pattern.
+
 Corresponds to `django.db.models.fields.DateTimeField`
 
 When using `ModelSerializer` or `HyperlinkedModelSerializer`, note that any model fields with `auto_now=True` or `auto_now_add=True` will use serializer fields that are `read_only=True` by default.
@@ -207,6 +215,10 @@ If you want to override this behavior, you'll need to declare the `DateTimeField
 
 A time representation.
 
+Uses `TIME_INPUT_FORMATS` to validate time.
+
+Optionally takes `format` as parameter to replace the matching pattern.
+
 Corresponds to `django.db.models.fields.TimeField`
 
 ## IntegerField

docs/topics/release-notes.md

@@ -44,6 +44,9 @@ You can determine your currently installed version using `pip freeze`:
 
 * Bugfix for serializer data being uncacheable with pickle protocol 0.
 * Bugfixes for model field validation edge-cases.
+* Support `DATE_INPUT_FORMATS` for `DateField` validation
+* Support `DATETIME_INPUT_FORMATS` for `DateTimeField` validation
+* Support `TIME_INPUT_FORMATS` for `TimeField` validation
 
 ### 2.2.1
 

rest_framework/fields.py

@@ -19,6 +19,7 @@ from rest_framework.compat import BytesIO
 from rest_framework.compat import six
 from rest_framework.compat import smart_text
 from rest_framework.compat import parse_time
+from rest_framework.utils.dates import get_readable_date_format
 
 
 def is_simple_callable(obj):
@@ -447,13 +448,14 @@ class DateField(WritableField):
     form_field_class = forms.DateField
 
     default_error_messages = {
-        'invalid': _("'%s' value has an invalid date format. It must be "
-                     "in YYYY-MM-DD format."),
-        'invalid_date': _("'%s' value has the correct format (YYYY-MM-DD) "
-                          "but it is an invalid date."),
+        'invalid': _(u"Date has wrong format. Use one of these formats instead: %s"),
     }
     empty = None
 
+    def __init__(self, *args, **kwargs):
+        self.format = kwargs.pop('format', settings.DATE_INPUT_FORMATS)
+        super(DateField, self).__init__(*args, **kwargs)
+
     def from_native(self, value):
         if value in validators.EMPTY_VALUES:
             return None
@@ -468,15 +470,16 @@ class DateField(WritableField):
         if isinstance(value, datetime.date):
             return value
 
-        try:
-            parsed = parse_date(value)
-            if parsed is not None:
-                return parsed
-        except (ValueError, TypeError):
-            msg = self.error_messages['invalid_date'] % value
-            raise ValidationError(msg)
+        for format in self.format:
+            try:
+                parsed = datetime.datetime.strptime(value, format)
+            except (ValueError, TypeError):
+                pass
+            else:
+                return parsed.date()
 
-        msg = self.error_messages['invalid'] % value
+        date_input_formats = '; '.join(self.format)
+        msg = self.error_messages['invalid'] % get_readable_date_format(date_input_formats)
         raise ValidationError(msg)
 
 
@@ -486,16 +489,14 @@ class DateTimeField(WritableField):
     form_field_class = forms.DateTimeField
 
     default_error_messages = {
-        'invalid': _("'%s' value has an invalid format. It must be in "
-                     "YYYY-MM-DD HH:MM[:ss[.uuuuuu]][TZ] format."),
-        'invalid_date': _("'%s' value has the correct format "
-                          "(YYYY-MM-DD) but it is an invalid date."),
-        'invalid_datetime': _("'%s' value has the correct format "
-                              "(YYYY-MM-DD HH:MM[:ss[.uuuuuu]][TZ]) "
-                              "but it is an invalid date/time."),
+        'invalid': _(u"Datetime has wrong format. Use one of these formats instead: %s"),
     }
     empty = None
 
+    def __init__(self, *args, **kwargs):
+        self.format = kwargs.pop('format', settings.DATETIME_INPUT_FORMATS)
+        super(DateTimeField, self).__init__(*args, **kwargs)
+
     def from_native(self, value):
         if value in validators.EMPTY_VALUES:
             return None
@@ -516,23 +517,16 @@ class DateTimeField(WritableField):
                 value = timezone.make_aware(value, default_timezone)
             return value
 
-        try:
-            parsed = parse_datetime(value)
-            if parsed is not None:
+        for format in self.format:
+            try:
+                parsed = datetime.datetime.strptime(value, format)
+            except (ValueError, TypeError):
+                pass
+            else:
                 return parsed
-        except (ValueError, TypeError):
-            msg = self.error_messages['invalid_datetime'] % value
-            raise ValidationError(msg)
 
-        try:
-            parsed = parse_date(value)
-            if parsed is not None:
-                return datetime.datetime(parsed.year, parsed.month, parsed.day)
-        except (ValueError, TypeError):
-            msg = self.error_messages['invalid_date'] % value
-            raise ValidationError(msg)
-
-        msg = self.error_messages['invalid'] % value
+        datetime_input_formats = '; '.join(self.format)
+        msg = self.error_messages['invalid'] % get_readable_date_format(datetime_input_formats)
         raise ValidationError(msg)
 
 
@@ -542,11 +536,14 @@ class TimeField(WritableField):
     form_field_class = forms.TimeField
 
     default_error_messages = {
-        'invalid': _("'%s' value has an invalid format. It must be a valid "
-                     "time in the HH:MM[:ss[.uuuuuu]] format."),
+        'invalid': _(u"Time has wrong format. Use one of these formats instead: %s"),
     }
     empty = None
 
+    def __init__(self, *args, **kwargs):
+        self.format = kwargs.pop('format', settings.TIME_INPUT_FORMATS)
+        super(TimeField, self).__init__(*args, **kwargs)
+
     def from_native(self, value):
         if value in validators.EMPTY_VALUES:
             return None
@@ -554,13 +551,17 @@ class TimeField(WritableField):
         if isinstance(value, datetime.time):
             return value
 
-        try:
-            parsed = parse_time(value)
-            assert parsed is not None
-            return parsed
-        except (ValueError, TypeError):
-            msg = self.error_messages['invalid'] % value
-            raise ValidationError(msg)
+        for format in self.format:
+            try:
+                parsed = datetime.datetime.strptime(value, format)
+            except (ValueError, TypeError):
+                pass
+            else:
+                return parsed.time()
+
+        time_input_formats = '; '.join(self.format)
+        msg = self.error_messages['invalid'] % get_readable_date_format(time_input_formats)
+        raise ValidationError(msg)
 
 
 class IntegerField(WritableField):

rest_framework/utils/dates.py

+def get_readable_date_format(date_format):
+    mapping = [("%Y", "YYYY"),
+               ("%y", "YY"),
+               ("%m", "MM"),
+               ("%b", "[Jan through Dec]"),
+               ("%B", "[January through December]"),
+               ("%d", "DD"),
+               ("%H", "HH"),
+               ("%M", "MM"),
+               ("%S", "SS"),
+               ("%f", "uuuuuu")]
+    for k, v in mapping:
+        date_format = date_format.replace(k, v)
+    return date_format
\ No newline at end of file