embed video form and model fields

embed_video/fields.py

@@ -0,0 +1,26 @@
+from django.db import models
+from django import forms
+from django.utils.translation import ugettext_lazy as _
+
+from .base import detect_backend
+
+__all__ = ('EmbedVideoField', 'EmbedVideoFormField')
+
+
+class EmbedVideoField(models.URLField):
+    def formfield(self, **kwargs):
+        defaults = {'form_class': EmbedVideoFormField}
+        defaults.update(kwargs)
+        return super(EmbedVideoField, self).formfield(**defaults)
+
+
+class EmbedVideoFormField(forms.URLField):
+    def validate(self, url):
+        super(EmbedVideoFormField, self).validate(url)
+
+        try:
+            detect_backend(url)
+        except:
+            raise forms.ValidationError(_(u'URL could not be recognized.'))
+
+        return url