object user.checkAuthentication
This method checks and prolongs user session.
The method accepts the following parameters.
| Parameter | Type | Description | 
|---|---|---|
| extend | boolean | Default value: "true". Setting it's value to "false" allows to check session without extending it's lifetime. Supported since Zabbix 4.0. | 
| sessionid | string | User session id. | 
Calling user.checkAuthentication method prolongs user session by default.
(object) Returns an object containing information about user.
Request:
{
           "jsonrpc": "2.0",
           "method": "user.checkAuthentication",
           "params": {
               "sessionid": "8C8447FF6F61D134CEAC740CCA1BC90D"
           },
           "id": 1
       }Response:
{
           "jsonrpc": "2.0",
           "result": {
               "userid": "1",
               "alias": "Admin",
               "name": "Zabbix",
               "surname": "Administrator",
               "url": "",
               "autologin": "1",
               "autologout": "0",
               "lang": "ru_RU",
               "refresh": "0",
               "type": "3",
               "theme": "default",
               "attempt_failed": "0",
               "attempt_ip": "127.0.0.1",
               "attempt_clock": "1355919038",
               "rows_per_page": "50",
               "debug_mode": true,
               "userip": "127.0.0.1",
               "sessionid": "8C8447FF6F61D134CEAC740CCA1BC90D",
               "gui_access": "0"
           },
           "id": 1
       }Response is similar to User.login call response with "userData" parameter set to true (the difference is that user data is retrieved by session id and not by username / password).
CUser::checkAuthentication() in frontends/php/include/classes/api/services/CUser.php.