Show the public key for the remote host when configuring the XMLRPC...

Show the public key for the remote host when configuring the XMLRPC authinstance for it. Now people will be able to change it in Mahara without going to the database.

htdocs/auth/xmlrpc/lib.php

@@ -582,6 +582,25 @@ class PluginAuthXmlrpc extends PluginAuth {
             'value' => 'xmlrpc'
         );
 
+        if ($instance) {
+            $elements['publickey'] = array(
+                'type' => 'textarea',
+                'title' => get_string('publickey', 'admin'),
+                'defaultvalue' => get_field('host', 'publickey', 'wwwroot', self::$default_config['wwwroot']),
+                'rules' => array(
+                    'required' => true,
+                ),
+                'rows' => 15,
+                'cols' => 70,
+            );
+
+            $elements['publickeyexpires']= array(
+                'type' => 'html',
+                'title' => get_string('publickeyexpires', 'admin'),
+                'value' => format_date(get_field('host', 'publickeyexpires', 'wwwroot', self::$default_config['wwwroot'])),
+            );
+        }
+
         $elements['name'] = array(
             'type' => 'text',
             'title' => get_string('name', 'auth'),
@@ -676,6 +695,15 @@ class PluginAuthXmlrpc extends PluginAuth {
             }
         }
 
+        if (isset($values['publickey'])) {
+            try {
+                new PublicKey($values['publickey'], $peer->wwwroot);
+            }
+            catch (CryptException $e) {
+                $form->set_error('publickey', $e->getMessage());
+            }
+        }
+
         //TODO: test values and set appropriate errors on form
     }
 
@@ -720,11 +748,13 @@ class PluginAuthXmlrpc extends PluginAuth {
         $peer->portno               = $values['portno'];
         $peer->appname              = $values['appname'];
         $peer->institution          = $values['institution'];
+        if (isset($values['publickey'])) {
+            $peer->publickey            = new PublicKey($values['publickey'], $peer->wwwroot);
+            $peer->publickeyexpires     = $peer->publickey->expires;
+        }
 
         /**
          * The following properties are not user-updatable
-        $peer->publickey            = $values['publickey'];
-        $peer->publickeyexpires     = $values['publickeyexpires'];
         $peer->lastconnecttime      = $values['lastconnecttime'];
          */