admin: add support for extra links

.vscode/settings.json

@@ -5,6 +5,7 @@
     "editor.tabSize": 2
   },
   "cSpell.words": [
+    "SAML",
     "pyazo"
   ]
 }

passbook/admin/templates/administration/provider/list.html

@@ -2,6 +2,7 @@
 
 {% load i18n %}
 {% load utils %}
+{% load admin_reflection %}
 
 {% block title %}
 {% title %}
@@ -38,6 +39,10 @@
           <td>
             <a class="btn btn-default btn-sm" href="{% url 'passbook_admin:provider-update' pk=provider.pk %}?back={{ request.get_full_path }}">{% trans 'Edit' %}</a>
             <a class="btn btn-default btn-sm" href="{% url 'passbook_admin:provider-delete' pk=provider.pk %}?back={{ request.get_full_path }}">{% trans 'Delete' %}</a>
+            {% get_links provider as links %}
+            {% for name, href in links.items %}
+              <a class="btn btn-default btn-sm" href="{{ href }}?back={{ request.get_full_path }}">{% trans name %}</a>
+            {% endfor %}
           </td>
         </tr>
       {% endfor %}

passbook/admin/templates/administration/source/list.html

@@ -2,6 +2,7 @@
 
 {% load i18n %}
 {% load utils %}
+{% load admin_reflection %}
 
 {% block content %}
 <div class="container">
@@ -34,6 +35,10 @@
           <td>
             <a class="btn btn-default btn-sm" href="{% url 'passbook_admin:source-update' pk=source.uuid %}?back={{ request.get_full_path }}">{% trans 'Edit' %}</a>
             <a class="btn btn-default btn-sm" href="{% url 'passbook_admin:source-delete' pk=source.uuid %}?back={{ request.get_full_path }}">{% trans 'Delete' %}</a>
+            {% get_links source as links %}
+            {% for name, href in links %}
+              <a class="btn btn-default btn-sm" href="{{ href }}?back={{ request.get_full_path }}">{% trans name %}</a>
+            {% endfor %}
           </td>
         </tr>
       {% endfor %}

passbook/admin/templatetags/admin_reflection.py

@@ -0,0 +1,26 @@
+"""passbook admin templatetags"""
+import inspect
+from logging import getLogger
+
+from django import template
+from django.db.models import Model
+
+register = template.Library()
+LOGGER = getLogger(__name__)
+
+@register.simple_tag()
+def get_links(model_instance):
+    """Find all link_ methods on an object instance, run them and return as dict"""
+    prefix = 'link_'
+    links = {}
+
+    if not isinstance(model_instance, Model):
+        LOGGER.warning("Model %s is not instance of Model", model_instance)
+        return links
+
+    for name, method in inspect.getmembers(model_instance, predicate=inspect.ismethod):
+        if name.startswith(prefix):
+            human_name = name.replace(prefix, '').replace('_', ' ').capitalize()
+            links[human_name] = method()
+
+    return links