Makes it possible to set a custom Gravatar source like robohash or your own.

docs/advanced_topics/settings.rst

@@ -231,6 +231,13 @@ This setting lets you change the number of items shown at 'Your most recent edit
 Allows the default ``LoginForm`` to be extended with extra fields.
 
 
+.. code-block:: python
+
+  WAGTAIL_GRAVATAR_PROVIDER_URL = '//www.gravatar.com/avatar'
+
+Allows to set your own Gravatar-like URL or alternatives like robohash.org
+
+
 Images
 ------
 

wagtail/users/models.py

@@ -106,7 +106,7 @@ class UserProfile(models.Model):
                 return self.default_avatar
 
         if self.avatar_choice == self.GRAVATAR and self.user.email:
-            return get_gravatar_url(self.user.email, default=None, size=50)
+            return get_gravatar_url(self.user.email, size=50)
 
         return self.default_avatar
 

wagtail/users/utils.py

@@ -1,4 +1,5 @@
 import hashlib
+from django.conf import settings
 from django.utils.http import urlencode
 
 from wagtail.core.compat import AUTH_USER_APP_LABEL, AUTH_USER_MODEL_NAME
@@ -21,10 +22,15 @@ def user_can_delete_user(current_user, user_to_delete):
     return True
 
 
-def get_gravatar_url(email, default=None, size=50):
-    params = {'s': str(size), 'd': 'mm'}
-    if default is not None:
-        params['default'] = default
-    gravatar_url = "https://www.gravatar.com/avatar/" + hashlib.md5(email.lower().encode('utf-8')).hexdigest() + "?"
-    gravatar_url += urlencode(params)
+def get_gravatar_url(email, size=50):
+    default = "mm"
+    size = int(size) * 2  # requested at retina size by default and scaled down at point of use with css
+    gravatar_provider_url = getattr(settings, 'WAGTAIL_GRAVATAR_PROVIDER_URL', '//www.gravatar.com/avatar').rstrip('/')
+
+    gravatar_url = "{gravatar_provider_url}/{hash}?{params}".format(
+        gravatar_provider_url=gravatar_provider_url,
+        hash=hashlib.md5(email.lower().encode('utf-8')).hexdigest(),
+        params=urlencode({'s': size, 'd': default})
+    )
+
     return gravatar_url