wireguard: Fix auto-adding client when no domains are configured

- When no domains are configured, and .local domain is filtered out, an
exception is thrown by the auto-add client page.

- Don't filter out .local domain. It is still a valid endpoint for peers to
connect to.

- Instead of showing just one domain, show all the domains as endpoints to
connect to.

- Don't store private key in the session. It is retained for longer than
necessary and also sessions are stored on the disk.

Tests:

- Remove all configured domains from the system and click 'Add Client
Automatically' button. It throws an exception. With the patch, it works.

- The Add Client Automatically page shows all the domains as endpoints.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

freedombox/modules/wireguard/templates/wireguard_auto_add_client.html

@@ -19,17 +19,28 @@
     {% if client_privkey %}
     <div class="form-group">
     <table class="table table-sm">
-      <tr><td>{% trans "IP Address" %}</td><td>{{ next_ip }}</td></tr>
-      <tr><td>{% trans "Endpoint" %}</td><td>{{ endpoint }}</td></tr>
-      <tr><td>{% trans "Public Key" %}</td>
-        <td class="pubkey-val">{{ client_pubkey }}</td></tr>
-      <tr><td>{% trans "Private Key" %}</td>
+      <tr>
+        <td>{% trans "IP Address" %}</td>
+        <td>{{ next_ip }}</td>
+      </tr>
+      <tr>
+        <td>{% trans "Endpoint(s)" %}</td>
+        <td><pre>{% for endpoint in endpoints %}{{ endpoint }}
+{% endfor %}</pre></td>
+      </tr>
+      <tr>
+        <td>{% trans "Public Key" %}</td>
+        <td class="pubkey-val">{{ client_pubkey }}</td>
+      </tr>
+      <tr>
+        <td>{% trans "Private Key" %}</td>
         <td>
           <details class="privkey-val">
             <summary>{% trans "Click to reveal" %}</summary>
             {{ client_privkey }}
 	  </details>
-	</td></tr>
+	</td>
+      </tr>
     </table>
 
     <div class="alert alert-warning">

freedombox/modules/wireguard/views.py

@@ -152,11 +152,8 @@ class AutoAddClientView(SuccessMessageMixin, FormView):
 
         if server_info:
             domains = DomainName.list_names(filter_for_service='wireguard')
-            filtered_domains = [
-                domain for domain in domains if not domain.endswith('.local')
-            ]
             port = server_info.get('listen_port', 51820)
-            endpoint = f"{filtered_domains[0]}:{port}"
+            endpoints = [f'{domain}:{port}' for domain in domains]
 
         try:
             client_privkey, client_pubkey = utils.generate_client_keypair()
@@ -167,23 +164,16 @@ class AutoAddClientView(SuccessMessageMixin, FormView):
             settings = connection.get_setting_by_name(setting_name)
             next_ip = utils._get_next_available_ip_address(settings)
 
-            data = {
-                'next_ip': next_ip,
-                'client_privkey': client_privkey,
-                'client_pubkey': client_pubkey,
-                'endpoint': endpoint
-            }
-
             # Add properties to template context
-            context['domains'] = filtered_domains
-            context.update(data)
+            context['client_pubkey'] = client_pubkey
+            context['client_privkey'] = client_privkey
+            context['next_ip'] = next_ip
+            context['endpoints'] = endpoints
 
             # Store info on instance for reuse
-            self.request.session.update(data)
-
-        except Exception as e:
-            messages.warning(f"Client key generation failed: {e}")
-        pass
+            self.request.session['client_pubkey'] = client_pubkey
+        except Exception as exception:
+            messages.warning('Client key generation failed: %s', exception)
 
         return context