[ticket/16204] Remove hooks system

PHPBB3-16204

6 files changed, 21 insertions, 324 deletions

diff --git a/phpBB/common.php b/phpBB/common.php
index 0870786824..bfdc2c4fd4 100644
--- a/phpBB/common.php
+++ b/phpBB/common.php
@@ -143,10 +143,6 @@ if (@is_file($phpbb_root_path . $config['exts_composer_vendor_dir'] . '/autoload
 	require_once($phpbb_root_path . $config['exts_composer_vendor_dir'] . '/autoload.php');
 }
 
-// Add own hook handler
-require($phpbb_root_path . 'includes/hooks/index.' . $phpEx);
-$phpbb_hook = new phpbb_hook(array('exit_handler', 'phpbb_user_session_handler', 'append_sid', array('template', 'display')));
-
 /* @var $phpbb_hook_finder \phpbb\hook\finder */
 $phpbb_hook_finder = $phpbb_container->get('hook_finder');
 
diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 0a3cb26041..21aabf6006 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -1514,7 +1514,7 @@ function tracking_unserialize($string, $max_depth = 3)
 */
 function append_sid($url, $params = false, $is_amp = true, $session_id = false, $is_route = false)
 {
-	global $_SID, $_EXTRA_URL, $phpbb_hook, $phpbb_path_helper;
+	global $_SID, $_EXTRA_URL, $phpbb_path_helper;
 	global $phpbb_dispatcher;
 
 	if ($params === '' || (is_array($params) && empty($params)))
@@ -1561,18 +1561,6 @@ function append_sid($url, $params = false, $is_amp = true, $session_id = false,
 		return $append_sid_overwrite;
 	}
 
-	// The following hook remains for backwards compatibility, though use of
-	// the event above is preferred.
-	// Developers using the hook function need to globalise the $_SID and $_EXTRA_URL on their own and also handle it appropriately.
-	// They could mimic most of what is within this function
-	if (!empty($phpbb_hook) && $phpbb_hook->call_hook(__FUNCTION__, $url, $params, $is_amp, $session_id))
-	{
-		if ($phpbb_hook->hook_return(__FUNCTION__))
-		{
-			return $phpbb_hook->hook_return_result(__FUNCTION__);
-		}
-	}
-
 	$params_is_array = is_array($params);
 
 	// Get anchor
@@ -4543,17 +4531,31 @@ function garbage_collection()
 * This function supports hooks.
 *
 * Note: This function is called after the template has been outputted.
+ *
+ * @return void
 */
 function exit_handler()
 {
-	global $phpbb_hook;
+	global $phpbb_dispatcher;
+
+	$exit_handler_override = false;
 
-	if (!empty($phpbb_hook) && $phpbb_hook->call_hook(__FUNCTION__))
+	/**
+	 * This event can either supplement or override the exit_handler() function
+	 *
+	 * To override this function, the event must set $exit_handler_override to
+	 * true to force it to exit directly after calling this event.
+	 *
+	 * @event core.exit_handler
+	 * @var	bool	exit_handler_override		Flag to signify exit is handled elsewhere
+	 * @since 4.0.0-a1
+	 */
+	$vars = ['exit_handler_override'];
+	extract($phpbb_dispatcher->trigger_event('core.exit_handler', compact($vars)));
+
+	if ($exit_handler_override)
 	{
-		if ($phpbb_hook->hook_return(__FUNCTION__))
-		{
-			return $phpbb_hook->hook_return_result(__FUNCTION__);
-		}
+		return;
 	}
 
 	// As a pre-caution... some setups display a blank page if the flush() is not there.
@@ -4563,25 +4565,6 @@ function exit_handler()
 }
 
 /**
-* Handler for init calls in phpBB. This function is called in \phpbb\user::setup();
-* This function supports hooks.
-*/
-function phpbb_user_session_handler()
-{
-	global $phpbb_hook;
-
-	if (!empty($phpbb_hook) && $phpbb_hook->call_hook(__FUNCTION__))
-	{
-		if ($phpbb_hook->hook_return(__FUNCTION__))
-		{
-			return $phpbb_hook->hook_return_result(__FUNCTION__);
-		}
-	}
-
-	return;
-}
-
-/**
 * Casts a numeric string $input to an appropriate numeric type (i.e. integer or float)
 *
 * @param string $input		A numeric string.
diff --git a/phpBB/includes/hooks/index.php b/phpBB/includes/hooks/index.php
deleted file mode 100644
index 821242cbf4..0000000000
--- a/phpBB/includes/hooks/index.php
+++ /dev/null
@@ -1,250 +0,0 @@
-<?php
-/**
-*
-* This file is part of the phpBB Forum Software package.
-*
-* @copyright (c) phpBB Limited <https://www.phpbb.com>
-* @license GNU General Public License, version 2 (GPL-2.0)
-*
-* For full copyright and license information, please see
-* the docs/CREDITS.txt file.
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
-* phpBB Hook Class
-*/
-class phpbb_hook
-{
-	/**
-	* Registered hooks
-	*/
-	var $hooks = array();
-
-	/**
-	* Results returned by functions called
-	*/
-	var $hook_result = array();
-
-	/**
-	* internal pointer
-	*/
-	var $current_hook = NULL;
-
-	/**
-	* Initialize hook class.
-	*
-	* @param array $valid_hooks array containing the hookable functions/methods
-	*/
-	function __construct($valid_hooks)
-	{
-		foreach ($valid_hooks as $_null => $method)
-		{
-			$this->add_hook($method);
-		}
-
-		if (function_exists('phpbb_hook_register'))
-		{
-			phpbb_hook_register($this);
-		}
-	}
-
-	/**
-	* Register function/method to be called within hook
-	* This function is normally called by the modification/application to attach/register the functions.
-	*
-	* @param mixed $definition Declaring function (with __FUNCTION__) or class with array(__CLASS__, __FUNCTION__)
-	* @param mixed $hook The replacement function/method to be called. Passing function name or array with object/class definition
-	* @param string $mode Specify the priority/chain mode. 'normal' -> hook gets appended to the chain. 'standalone' -> only the specified hook gets called - later hooks are not able to overwrite this (E_NOTICE is triggered then). 'first' -> hook is called as the first one within the chain. 'last' -> hook is called as the last one within the chain.
-	*/
-	function register($definition, $hook, $mode = 'normal')
-	{
-		$class = (!is_array($definition)) ? '__global' : $definition[0];
-		$function = (!is_array($definition)) ? $definition : $definition[1];
-
-		// Method able to be hooked?
-		if (isset($this->hooks[$class][$function]))
-		{
-			switch ($mode)
-			{
-				case 'standalone':
-					if (!isset($this->hooks[$class][$function]['standalone']))
-					{
-						$this->hooks[$class][$function] = array('standalone' => $hook);
-					}
-					else
-					{
-						trigger_error('Hook not able to be called standalone, previous hook already standalone.', E_NOTICE);
-					}
-				break;
-
-				case 'first':
-				case 'last':
-					$this->hooks[$class][$function][$mode][] = $hook;
-				break;
-
-				case 'normal':
-				default:
-					$this->hooks[$class][$function]['normal'][] = $hook;
-				break;
-			}
-		}
-	}
-
-	/**
-	* Calling all functions/methods attached to a specified hook.
-	* Called by the function allowing hooks...
-	*
-	* @param mixed $definition Declaring function (with __FUNCTION__) or class with array(__CLASS__, __FUNCTION__)
-	* @return bool False if no hook got executed, true otherwise
-	*/
-	function call_hook($definition)
-	{
-		$class = (!is_array($definition)) ? '__global' : $definition[0];
-		$function = (!is_array($definition)) ? $definition : $definition[1];
-
-		if (!empty($this->hooks[$class][$function]))
-		{
-			// Developer tries to call a hooked function within the hooked function...
-			if ($this->current_hook !== NULL && $this->current_hook['class'] === $class && $this->current_hook['function'] === $function)
-			{
-				return false;
-			}
-
-			// Call the hook with the arguments attached and store result
-			$arguments = func_get_args();
-			$this->current_hook = array('class' => $class, 'function' => $function);
-			$arguments[0] = &$this;
-
-			// Call the hook chain...
-			if (isset($this->hooks[$class][$function]['standalone']))
-			{
-				$this->hook_result[$class][$function] = call_user_func_array($this->hooks[$class][$function]['standalone'], $arguments);
-			}
-			else
-			{
-				foreach (array('first', 'normal', 'last') as $mode)
-				{
-					if (!isset($this->hooks[$class][$function][$mode]))
-					{
-						continue;
-					}
-
-					foreach ($this->hooks[$class][$function][$mode] as $hook)
-					{
-						$this->hook_result[$class][$function] = call_user_func_array($hook, $arguments);
-					}
-				}
-			}
-
-			$this->current_hook = NULL;
-			return true;
-		}
-
-		$this->current_hook = NULL;
-		return false;
-	}
-
-	/**
-	* Get result from previously called functions/methods for the same hook
-	*
-	* @param mixed $definition Declaring function (with __FUNCTION__) or class with array(__CLASS__, __FUNCTION__)
-	* @return mixed False if nothing returned if there is no result, else array('result' => ... )
-	*/
-	function previous_hook_result($definition)
-	{
-		$class = (!is_array($definition)) ? '__global' : $definition[0];
-		$function = (!is_array($definition)) ? $definition : $definition[1];
-
-		if (!empty($this->hooks[$class][$function]) && isset($this->hook_result[$class][$function]))
-		{
-			return array('result' => $this->hook_result[$class][$function]);
-		}
-
-		return false;
-	}
-
-	/**
-	* Check if the called functions/methods returned something.
-	*
-	* @param mixed $definition Declaring function (with __FUNCTION__) or class with array(__CLASS__, __FUNCTION__)
-	* @return bool True if results are there, false if not
-	*/
-	function hook_return($definition)
-	{
-		$class = (!is_array($definition)) ? '__global' : $definition[0];
-		$function = (!is_array($definition)) ? $definition : $definition[1];
-
-		if (!empty($this->hooks[$class][$function]) && isset($this->hook_result[$class][$function]))
-		{
-			return true;
-		}
-
-		return false;
-	}
-
-	/**
-	* Give actual result from called functions/methods back.
-	*
-	* @param mixed $definition Declaring function (with __FUNCTION__) or class with array(__CLASS__, __FUNCTION__)
-	* @return mixed The result
-	*/
-	function hook_return_result($definition)
-	{
-		$class = (!is_array($definition)) ? '__global' : $definition[0];
-		$function = (!is_array($definition)) ? $definition : $definition[1];
-
-		if (!empty($this->hooks[$class][$function]) && isset($this->hook_result[$class][$function]))
-		{
-			$result = $this->hook_result[$class][$function];
-			unset($this->hook_result[$class][$function]);
-			return $result;
-		}
-
-		return;
-	}
-
-	/**
-	* Add new function to the allowed hooks.
-	*
-	* @param mixed $definition Declaring function (with __FUNCTION__) or class with array(__CLASS__, __FUNCTION__)
-	*/
-	function add_hook($definition)
-	{
-		if (!is_array($definition))
-		{
-			$definition = array('__global', $definition);
-		}
-
-		$this->hooks[$definition[0]][$definition[1]] = array();
-	}
-
-	/**
-	* Remove function from the allowed hooks.
-	*
-	* @param mixed $definition Declaring function (with __FUNCTION__) or class with array(__CLASS__, __FUNCTION__)
-	*/
-	function remove_hook($definition)
-	{
-		$class = (!is_array($definition)) ? '__global' : $definition[0];
-		$function = (!is_array($definition)) ? $definition : $definition[1];
-
-		if (isset($this->hooks[$class][$function]))
-		{
-			unset($this->hooks[$class][$function]);
-
-			if (isset($this->hook_result[$class][$function]))
-			{
-				unset($this->hook_result[$class][$function]);
-			}
-		}
-	}
-}
diff --git a/phpBB/phpbb/template/base.php b/phpBB/phpbb/template/base.php
index d502aceab8..314cdc4796 100644
--- a/phpBB/phpbb/template/base.php
+++ b/phpBB/phpbb/template/base.php
@@ -168,26 +168,4 @@ abstract class base implements template
 	{
 		return $this->context->find_key_index($blockname, $key);
 	}
-
-	/**
-	* Calls hook if any is defined.
-	*
-	* @param string $handle Template handle being displayed.
-	* @param string $method Method name of the caller.
-	*/
-	protected function call_hook($handle, $method)
-	{
-		global $phpbb_hook;
-
-		if (!empty($phpbb_hook) && $phpbb_hook->call_hook(array('template', $method), $handle, $this))
-		{
-			if ($phpbb_hook->hook_return(array('template', $method)))
-			{
-				$result = $phpbb_hook->hook_return_result(array('template', $method));
-				return array($result);
-			}
-		}
-
-		return false;
-	}
 }
diff --git a/phpBB/phpbb/template/twig/twig.php b/phpBB/phpbb/template/twig/twig.php
index f322778eda..f0736045de 100644
--- a/phpBB/phpbb/template/twig/twig.php
+++ b/phpBB/phpbb/template/twig/twig.php
@@ -308,12 +308,6 @@ class twig extends \phpbb\template\base
 	*/
 	public function display($handle)
 	{
-		$result = $this->call_hook($handle, __FUNCTION__);
-		if ($result !== false)
-		{
-			return $result[0];
-		}
-
 		$this->twig->display($this->get_filename_from_handle($handle), $this->get_template_vars());
 
 		return $this;
diff --git a/phpBB/phpbb/user.php b/phpBB/phpbb/user.php
index 21d156e060..60cc85e46c 100644
--- a/phpBB/phpbb/user.php
+++ b/phpBB/phpbb/user.php
@@ -342,10 +342,6 @@ class user extends \phpbb\session
 
 		$this->img_lang = $this->lang_name;
 
-		// Call phpbb_user_session_handler() in case external application want to "bend" some variables or replace classes...
-		// After calling it we continue script execution...
-		phpbb_user_session_handler();
-
 		/**
 		* Execute code at the end of user setup
 		*