* Finish task #57893.

module/user/control.php

@@ -960,6 +960,8 @@ class user extends control
         }
         else
         {
+            $loginExpired = !(preg_match("/(m=|\/)(index)(&f=|-)(index)(&|-|\.)?/", strtolower($this->referer), $output) or $this->referer == '/' or $this->referer == '/zentao/');
+
             $this->loadModel('misc');
             $this->loadModel('extension');
             $this->view->noGDLib       = sprintf($this->lang->misc->noGDLib, common::getSysURL() . $this->config->webRoot, '', false, true);
@@ -970,6 +972,7 @@ class user extends control
             $this->view->rand          = $this->user->updateSessionRandom();
             $this->view->unsafeSites   = $this->misc->checkOneClickPackage();
             $this->view->plugins       = $this->extension->getExpiringPlugins(true);
+            $this->view->loginExpired  = $loginExpired;
             $this->display();
         }
     }

module/user/lang/en.php

@@ -153,6 +153,7 @@ $lang->user->loginLocked  = "Please contact the administrator to unlock your acc
 $lang->user->weakPassword = "Your password does not meet the requirements.";
 $lang->user->errorWeak    = "Passwords cannot use [%s] weak passwords.";
 $lang->user->errorCaptcha = "Captcha Error";
+$lang->user->loginExpired = 'System login has expired, please log in again :)';
 
 $lang->user->roleList['']       = '';
 $lang->user->roleList['dev']    = 'Developer';

module/user/lang/zh-cn.php

@@ -153,6 +153,7 @@ $lang->user->loginLocked  = "密码尝试次数太多，请联系管理员解锁
 $lang->user->weakPassword = "您的密码强度小于系统设定。";
 $lang->user->errorWeak    = "密码不能使用【%s】这些常用弱口令。";
 $lang->user->errorCaptcha = "验证码不正确！";
+$lang->user->loginExpired = '系统登录已过期，请重新登录：）';
 
 $lang->user->roleList['']       = '';
 $lang->user->roleList['dev']    = '研发';

module/user/view/login.html.php

@@ -33,6 +33,9 @@ if(empty($config->notMd5Pwd))js::import($jsRoot . 'md5.js');
           <form method='post' target='hiddenwin'>
             <table class='table table-form'>
               <tbody>
+                <?php if($loginExpired):?>
+                <p class='text-red'><?php echo $lang->user->loginExpired;?></p>
+                <?php endif;?>
                 <tr>
                   <th><?php echo $lang->user->account;?></th>
                   <td><input class='form-control' type='text' name='account' id='account' autocomplete='off' autofocus /></td>