[ticket/14387] Extend avatar-driver by extension in ACP not possible

Create a driver method to provide the driver config name, and use it
within the manager method. Default driver config name is the same as now.
But new drivers are able to override the config name with their own.

PHPBB3-14387

phpBB/phpbb/avatar/driver/driver.php

@@ -119,6 +119,14 @@ abstract class driver implements \phpbb\avatar\driver\driver_interface
 		return $this->name;
 	}
 
+	/**
+	* {@inheritdoc}
+	*/
+	public function get_config_name()
+	{
+		return preg_replace('#^phpbb\\\\avatar\\\\driver\\\\#', '', get_class($this));
+	}
+
 	/**
 	* Sets the name of the driver.
 	*

phpBB/phpbb/avatar/driver/driver_interface.php

@@ -25,6 +25,13 @@ interface driver_interface
 	*/
 	public function get_name();
 
+	/**
+	* Returns the config name of the driver. To be used in accessing the CONFIG variables.
+	*
+	* @return string	Config name of driver.
+	*/
+	public function get_config_name();
+
 	/**
 	* Get the avatar url and dimensions
 	*

phpBB/phpbb/avatar/manager.php

@@ -276,7 +276,7 @@ class manager
 	*/
 	public function get_driver_config_name($driver)
 	{
-		return preg_replace('#^phpbb\\\\avatar\\\\driver\\\\#', '', get_class($driver));
+		return $driver->get_config_name();
 	}
 
 	/**