Allow to create a user for a specific backend

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/private/User/Manager.php

@@ -38,6 +38,7 @@ use OCP\IUser;
 use OCP\IUserBackend;
 use OCP\IUserManager;
 use OCP\IConfig;
+use OCP\UserInterface;
 
 /**
  * Class Manager
@@ -321,9 +322,26 @@ class Manager extends PublicEmitter implements IUserManager {
 				return $user;
 			}
 		}
+
 		return false;
 	}
 
+	/**
+	 * @param string $uid
+	 * @param string $password
+	 * @param UserInterface $backend
+	 * @return IUser|null
+	 */
+	public function createUserFromBackend($uid, $password, UserInterface $backend) {
+		$this->emit('\OC\User', 'preCreateUser', [$uid, $password]);
+		$backend->createUser($uid, $password);
+		$user = $this->getUserObject($uid, $backend);
+		if ($user instanceof IUser) {
+			$this->emit('\OC\User', 'postCreateUser', [$user, $password]);
+		}
+		return $user;
+	}
+
 	/**
 	 * returns how many users per backend exist (if supported by backend)
 	 *

lib/public/IUserManager.php

@@ -129,6 +129,15 @@ interface IUserManager {
 	 */
 	public function createUser($uid, $password);
 
+	/**
+	 * @param string $uid
+	 * @param string $password
+	 * @param UserInterface $backend
+	 * @return IUser|null
+	 * @since 12.0.0
+	 */
+	public function createUserFromBackend($uid, $password, UserInterface $backend);
+
 	/**
 	 * returns how many users per backend exist (if supported by backend)
 	 *