1 files changed, 30 insertions, 2 deletions
diff --git a/mediagoblin/edit/forms.py b/mediagoblin/edit/forms.py
index c2355980..7c390a3f 100644
--- a/mediagoblin/edit/forms.py
+++ b/mediagoblin/edit/forms.py
@@ -15,10 +15,12 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import wtforms
+from jsonschema import Draft4Validator
 
 from mediagoblin.tools.text import tag_length_validator
 from mediagoblin.tools.translate import lazy_pass_to_ugettext as _
 from mediagoblin.tools.licenses import licenses_as_choices
+from mediagoblin.tools.metadata import DEFAULT_SCHEMA, DEFAULT_CHECKER
 from mediagoblin.auth.tools import normalize_user_or_email_field
 
 
@@ -123,11 +125,37 @@ class ChangeEmailForm(wtforms.Form):
         description=_(
             "Enter your password to prove you own this account."))
 
+class MetaDataValidator(object):
+    """
+    Custom validator which runs form data in a MetaDataForm through a jsonschema
+    validator and passes errors recieved in jsonschema to wtforms.
+
+    :param  schema              The json schema to validate the data against. By
+                                default this uses the DEFAULT_SCHEMA from
+                                mediagoblin.tools.metadata.
+    :param  format_checker      The FormatChecker object that limits which types
+                                jsonschema can recognize. By default this uses
+                                DEFAULT_CHECKER from mediagoblin.tools.metadata.
+    """
+    def __init__(self, schema=DEFAULT_SCHEMA, format_checker=DEFAULT_CHECKER):
+        self.schema = schema
+        self.format_checker = format_checker
+
+    def __call__(self, form, field):
+        metadata_dict = {field.data:form.value.data}
+        validator = Draft4Validator(self.schema,
+                        format_checker=self.format_checker)
+        errors = [e.message
+            for e in validator.iter_errors(metadata_dict)]
+        if len(errors) >= 1:
+            raise wtforms.validators.ValidationError(
+                errors.pop())
+
 class MetaDataForm(wtforms.Form):
-    identifier = wtforms.TextField(_(u'Identifier'))
+    identifier = wtforms.TextField(_(u'Identifier'),[MetaDataValidator()])
     value = wtforms.TextField(_(u'Value'))
 
 class EditMetaDataForm(wtforms.Form):
     media_metadata = wtforms.FieldList(
-        wtforms.FormField(MetaDataForm, label="")
+        wtforms.FormField(MetaDataForm, ""),
     )