isAccessibleByCurrentUser() can run without $INFO

Because the isAccessibleByUser method can be run in contexts where $INFO
is not available, an explicit check is needed.

_test/tests/inc/template_include_page.test.php

@@ -32,9 +32,7 @@ class template_pagetitle_test extends DokuWikiTest {
     }
 
     function test_adminPluginTitle() {
-        global $ID,$ACT,$INPUT,$conf,$INFO;
-        $INFO['isadmin'] = true;
-        $INFO['ismanager'] = true;
+        global $ID,$ACT,$INPUT,$conf,$USERINFO;
 
         if (!plugin_load('admin','revert')) {
             $this->markTestSkipped('Revert plugin not found, unable to test admin plugin titles');
@@ -46,6 +44,7 @@ class template_pagetitle_test extends DokuWikiTest {
         $conf['lang'] = 'en';
         $INPUT->set('page','revert');
 
+        $INPUT->server->set('REMOTE_USER', 'testuser'); // this user is admin
         $this->assertEquals('Revert Manager', tpl_pagetitle(null, true));
     }
 

lib/plugins/admin.php

@@ -78,8 +78,6 @@ class DokuWiki_Admin_Plugin extends DokuWiki_Plugin {
      * @return bool true if the current user may access this admin plugin
      */
     public function isAccessibleByCurrentUser() {
-        global $INFO;
-
         $data = [];
         $data['instance'] = $this;
         $data['hasAccess'] = false;
@@ -87,9 +85,9 @@ class DokuWiki_Admin_Plugin extends DokuWiki_Plugin {
         $event = new Doku_Event('ADMINPLUGIN_ACCESS_CHECK', $data);
         if($event->advise_before()) {
             if ($this->forAdminOnly()) {
-                $data['hasAccess'] = $INFO['isadmin'];
+                $data['hasAccess'] = auth_isadmin();
             } else {
-                $data['hasAccess'] = $INFO['ismanager'];
+                $data['hasAccess'] = auth_ismanager();
             }
         }
         $event->advise_after();