Closes #575: Allow all valid URL schemes in custom fields

netbox/extras/forms.py

@@ -3,6 +3,7 @@ from collections import OrderedDict
 from django import forms
 from django.contrib.contenttypes.models import ContentType
 
+from utilities.forms import LaxURLField
 from .models import (
     CF_TYPE_BOOLEAN, CF_TYPE_DATE, CF_TYPE_INTEGER, CF_TYPE_SELECT, CF_TYPE_URL, CustomField, CustomFieldValue
 )
@@ -56,7 +57,7 @@ def get_custom_fields_for_model(content_type, filterable_only=False, bulk_edit=F
 
         # URL
         elif cf.type == CF_TYPE_URL:
-            field = forms.URLField(required=cf.required, initial=cf.default)
+            field = LaxURLField(required=cf.required, initial=cf.default)
 
         # Text
         else:

netbox/utilities/forms.py

@@ -4,6 +4,7 @@ import re
 
 from django import forms
 from django.core.urlresolvers import reverse_lazy
+from django.core.validators import URLValidator
 from django.utils.encoding import force_text
 from django.utils.html import format_html
 from django.utils.safestring import mark_safe
@@ -253,6 +254,21 @@ class FilterChoiceField(forms.ModelMultipleChoiceField):
     choices = property(_get_choices, forms.ChoiceField._set_choices)
 
 
+class LaxURLField(forms.URLField):
+    """
+    Custom URLField which allows any valid URL scheme
+    """
+
+    class AnyURLScheme(object):
+        # A fake URL list which "contains" all scheme names abiding by the syntax defined in RFC 3986 section 3.1
+        def __contains__(self, item):
+            if not item or not re.match('^[a-z][0-9a-z+\-.]*$', item.lower()):
+                return False
+            return True
+
+    default_validators = [URLValidator(schemes=AnyURLScheme())]
+
+
 #
 # Forms
 #