Checking that webservices is installed and active before displaying it's menu item

Bug 1419561

Change-Id: I72711b8a0d688abe7877ea32862cfc7b9db62b52
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>

htdocs/lib/mahara.php

@@ -1489,6 +1489,21 @@ function safe_require_plugin($plugintype, $pluginname, $filename='lib.php', $fun
     }
 }
 
+/**
+ * Check to see if a particular plugin is installed and is active by plugin name
+ *
+ * @param   string $pluginname Name of plugin
+ * @return  bool
+ */
+function is_plugin_active($pluginname) {
+    foreach (plugin_types() as $type) {
+        if (record_exists($type . '_installed', 'name', $pluginname, 'active', 1)) {
+            return true;
+        }
+    }
+    return false;
+}
+
 /**
  * This function returns the list of plugintypes we currently care about.
  *

htdocs/lib/web.php

@@ -2327,13 +2327,16 @@ function admin_nav() {
             'title'  => get_string('cleanurls', 'admin'),
             'weight' => 40,
         ),
-        'configextensions/webservices' => array(
+    );
+
+    if (is_plugin_active('webservice')) {
+        $menu['configextensions/webservices'] = array(
             'path'   => 'configextensions/webservices',
             'url'    => 'webservice/admin/index.php',
             'title'  => get_string('webservices', 'auth.webservice'),
             'weight' => 50,
-        ),
-    );
+        );
+    }
 
     // Add the menu items for skins, if that feature is enabled
     if (get_config('skins')) {