Fix check username in API (#1957)

* Fix check username in API

Fix https://github.com/FreshRSS/FreshRSS/issues/1955

* Changelog 1955

https://github.com/FreshRSS/FreshRSS/issues/1955
https://github.com/FreshRSS/FreshRSS/pull/1957

CHANGELOG.md

@@ -6,6 +6,7 @@
 	* Update Docker image to Alpine 3.8 with PHP 7.2 [#1956](https://github.com/FreshRSS/FreshRSS/pull/1956)
 * Bug fixing
 	* Fix bugs when searching with special characters (e.g. preventing marking as read) [#1944](https://github.com/FreshRSS/FreshRSS/issues/1944)
+	* Fix username check in API to allow underscores [#1955](https://github.com/FreshRSS/FreshRSS/issues/1955)
 * Mics.
 	* Auto-login after self user creation [#1928](https://github.com/FreshRSS/FreshRSS/issues/1928)
 

p/api/greader.php

@@ -176,7 +176,7 @@ function authorizationToUser() {
 }
 
 function clientLogin($email, $pass) {	//http://web.archive.org/web/20130604091042/http://undoc.in/clientLogin.html
-	if (ctype_alnum($email)) {
+	if (FreshRSS_user_Controller::checkUsername($email)) {
 		if (!function_exists('password_verify')) {
 			include_once(LIB_PATH . '/password_compat.php');
 		}