friendica/src/Core/Hook.php

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<?php
/**
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* @copyright Copyright (C) 2010-2023, the Friendica project
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*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
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*/
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namespace Friendica\Core;
use Friendica\App;
use Friendica\Database\DBA;
use Friendica\DI;
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use Friendica\Util\Strings;
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/**
* Some functions to handle hooks
*/
class Hook
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{
/**
* Array of registered hooks
*
* Format:
* [
* ["<hook name>"] => [
* 0 => "<hook file>",
* 1 => "<hook function name>"
* ],
* ...
* ]
*
* @var array
*/
private static $hooks = [];
/**
* Load hooks
*
* @return void
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*/
public static function loadHooks()
{
self::$hooks = [];
$stmt = DBA::select('hook', ['hook', 'file', 'function'], [], ['order' => ['priority' => 'desc', 'file']]);
while ($hook = DBA::fetch($stmt)) {
self::add($hook['hook'], $hook['file'], $hook['function']);
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}
DBA::close($stmt);
}
/**
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* Adds a new hook to the hooks array.
*
* This function is meant to be called by modules on each page load as it works after loadHooks has been called.
*
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* @param string $hook
* @param string $file
* @param string $function
* @return void
*/
public static function add(string $hook, string $file, string $function)
{
if (!array_key_exists($hook, self::$hooks)) {
self::$hooks[$hook] = [];
}
self::$hooks[$hook][] = [$file, $function];
}
/**
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* Registers a hook.
*
* This function is meant to be called once when an addon is enabled for example as it doesn't add to the current hooks.
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*
* @param string $hook the name of the hook
* @param string $file the name of the file that hooks into
* @param string $function the name of the function that the hook will call
* @param int $priority A priority (defaults to 0)
* @return mixed|bool
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
public static function register(string $hook, string $file, string $function, int $priority = 0)
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{
$file = str_replace(DI::app()->getBasePath() . DIRECTORY_SEPARATOR, '', $file);
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$condition = ['hook' => $hook, 'file' => $file, 'function' => $function];
if (DBA::exists('hook', $condition)) {
return true;
}
return self::insert(['hook' => $hook, 'file' => $file, 'function' => $function, 'priority' => $priority]);
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}
/**
* Unregisters a hook.
*
* @param string $hook the name of the hook
* @param string $file the name of the file that hooks into
* @param string $function the name of the function that the hook called
* @return boolean
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
public static function unregister(string $hook, string $file, string $function): bool
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{
$relative_file = str_replace(DI::app()->getBasePath() . DIRECTORY_SEPARATOR, '', $file);
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// This here is only needed for fixing a problem that existed on the develop branch
$condition = ['hook' => $hook, 'file' => $file, 'function' => $function];
self::delete($condition);
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$condition = ['hook' => $hook, 'file' => $relative_file, 'function' => $function];
return self::delete($condition);
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}
/**
* Returns the list of callbacks for a single hook
*
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* @param string $name Name of the hook
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* @return array
*/
public static function getByName(string $name): array
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{
$return = [];
if (isset(self::$hooks[$name])) {
$return = self::$hooks[$name];
}
return $return;
}
/**
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* Forks a hook.
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*
* Use this function when you want to fork a hook via the worker.
*
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* @param integer $priority of the hook
* @param string $name of the hook to call
* @param mixed $data to transmit to the callback handler
* @return void
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
public static function fork(int $priority, string $name, $data = null)
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{
if (array_key_exists($name, self::$hooks)) {
foreach (self::$hooks[$name] as $hook) {
// Call a hook to check if this hook call needs to be forked
if (array_key_exists('hook_fork', self::$hooks)) {
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$hookdata = ['name' => $name, 'data' => $data, 'execute' => true];
foreach (self::$hooks['hook_fork'] as $fork_hook) {
if ($hook[0] != $fork_hook[0]) {
continue;
}
self::callSingle('hook_fork', $fork_hook, $hookdata);
}
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if (!$hookdata['execute']) {
continue;
}
}
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Worker::add($priority, 'ForkHook', $name, $hook, $data);
}
}
}
/**
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* Calls a hook.
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*
* Use this function when you want to be able to allow a hook to manipulate
* the provided data.
*
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* @param string $name of the hook to call
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* @param string|array &$data to transmit to the callback handler
* @return void
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
public static function callAll(string $name, &$data = null)
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{
if (array_key_exists($name, self::$hooks)) {
foreach (self::$hooks[$name] as $hook) {
self::callSingle($name, $hook, $data);
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}
}
}
/**
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* Calls a single hook.
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*
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* @param string $name of the hook to call
* @param array $hook Hook data
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* @param string|array &$data to transmit to the callback handler
* @return void
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
public static function callSingle(string $name, array $hook, &$data = null)
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{
// Don't run a theme's hook if the user isn't using the theme
if (strpos($hook[0], 'view/theme/') !== false && strpos($hook[0], 'view/theme/' . DI::app()->getCurrentTheme()) === false) {
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return;
}
@include_once($hook[0]);
if (function_exists($hook[1])) {
$func = $hook[1];
$func($data);
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} else {
// remove orphan hooks
$condition = ['hook' => $name, 'file' => $hook[0], 'function' => $hook[1]];
self::delete($condition);
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}
}
/**
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* Checks if an app_menu hook exist for the provided addon name.
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* Return true if the addon is an app
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*
* @param string $name Name of the addon
* @return boolean
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*/
public static function isAddonApp(string $name): bool
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{
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$name = Strings::sanitizeFilePathItem($name);
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if (array_key_exists('app_menu', self::$hooks)) {
foreach (self::$hooks['app_menu'] as $hook) {
if ($hook[0] == 'addon/' . $name . '/' . $name . '.php') {
return true;
}
}
}
return false;
}
/**
* Deletes one or more hook records
*
* We have to clear the cached routerDispatchData because addons can provide routes
*
* @param array $condition
* @return bool
* @throws \Exception
*/
public static function delete(array $condition): bool
{
$result = DBA::delete('hook', $condition);
if ($result) {
DI::cache()->delete('routerDispatchData');
}
return $result;
}
/**
* Inserts a hook record
*
* We have to clear the cached routerDispatchData because addons can provide routes
*
* @param array $condition
* @return bool
* @throws \Exception
*/
private static function insert(array $condition): bool
{
$result = DBA::insert('hook', $condition);
if ($result) {
DI::cache()->delete('routerDispatchData');
}
return $result;
}
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}