SSO: allow specifying custom icon URL

docs/administration/authentication/overview.md

@@ -49,9 +49,9 @@ to an empty dictionary. This dictionary maps a `social_core` module's name (ie.
 `REMOTE_AUTH_BACKEND.name`) to a couple of parameters, `(display_name, icon)`.
 
 The `display_name` is the name displayed to the user on the login page. The
-icon refers to a [Material Design
-Icons](https://github.com/google/material-design-icons) icon's name, or `None`
-for no icon.
+icon may either be the URL of an icon; refer to a [Material Design
+Icons](https://github.com/google/material-design-icons) icon's name; or be
+`None` for no icon.
 
 For instance, the OIDC backend may be customized with
 ```python

netbox/account/views.py

@@ -44,10 +44,20 @@ class LoginView(View):
         return super().dispatch(*args, **kwargs)
 
     def gen_auth_data(self, name, url, params):
-        display_name, icon_name = get_auth_backend_display(name)
+        display_name, icon_source = get_auth_backend_display(name)
+
+        icon_name = None
+        icon_img = None
+        if icon_source:
+            if '://' in icon_source:
+                icon_img = icon_source
+            else:
+                icon_name = icon_source
+
         return {
             'display_name': display_name,
             'icon_name': icon_name,
+            'icon_img': icon_img,
             'url': f'{url}?{urlencode(params)}',
         }
 

netbox/templates/login.html

@@ -78,7 +78,8 @@
               {% for backend in auth_backends %}
                 <div class="col">
                   <a href="{{ backend.url }}" class="btn w-100">
-                    {% if backend.icon_name %}<i class="mdi mdi-{{ backend.icon_name }}"></i>{% endif %}
+                    {% if backend.icon_name %}<i class="mdi mdi-{{ backend.icon_name }}"></i>
+                    {% elif backend.icon_img %}<img src="{{ backend.icon_img }}" height="24" class="me-2" />{% endif %}
                     {{ backend.display_name }}
                   </a>
                 </div>