248 lines
6.8 KiB
PHP
248 lines
6.8 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2020, Friendica
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Core;
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use Friendica\App;
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use Friendica\Database\DBA;
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use Friendica\DI;
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use Friendica\Util\Strings;
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/**
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* Some functions to handle hooks
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*/
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class Hook
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{
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/**
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* Array of registered hooks
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*
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* Format:
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* [
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* ["<hook name>"] => [
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* 0 => "<hook file>",
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* 1 => "<hook function name>"
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* ],
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* ...
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* ]
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*
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* @var array
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*/
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private static $hooks = [];
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/**
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* Load hooks
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*/
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public static function loadHooks()
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{
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self::$hooks = [];
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$stmt = DBA::select('hook', ['hook', 'file', 'function'], [], ['order' => ['priority' => 'desc', 'file']]);
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while ($hook = DBA::fetch($stmt)) {
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self::add($hook['hook'], $hook['file'], $hook['function']);
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}
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DBA::close($stmt);
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}
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/**
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* Adds a new hook to the hooks array.
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*
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* 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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*
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* @param string $hook
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* @param string $file
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* @param string $function
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*/
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public static function add($hook, $file, $function)
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{
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if (!array_key_exists($hook, self::$hooks)) {
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self::$hooks[$hook] = [];
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}
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self::$hooks[$hook][] = [$file, $function];
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}
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/**
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* Registers a hook.
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*
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* 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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*
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* @param string $hook the name of the hook
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* @param string $file the name of the file that hooks into
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* @param string $function the name of the function that the hook will call
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* @param int $priority A priority (defaults to 0)
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* @return mixed|bool
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function register($hook, $file, $function, $priority = 0)
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{
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$file = str_replace(DI::app()->getBasePath() . DIRECTORY_SEPARATOR, '', $file);
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$condition = ['hook' => $hook, 'file' => $file, 'function' => $function];
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if (DBA::exists('hook', $condition)) {
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return true;
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}
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$result = DBA::insert('hook', ['hook' => $hook, 'file' => $file, 'function' => $function, 'priority' => $priority]);
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return $result;
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}
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/**
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* Unregisters a hook.
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*
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* @param string $hook the name of the hook
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* @param string $file the name of the file that hooks into
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* @param string $function the name of the function that the hook called
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* @return boolean
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function unregister($hook, $file, $function)
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{
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$relative_file = str_replace(DI::app()->getBasePath() . DIRECTORY_SEPARATOR, '', $file);
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// This here is only needed for fixing a problem that existed on the develop branch
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$condition = ['hook' => $hook, 'file' => $file, 'function' => $function];
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DBA::delete('hook', $condition);
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$condition = ['hook' => $hook, 'file' => $relative_file, 'function' => $function];
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$result = DBA::delete('hook', $condition);
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return $result;
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}
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/**
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* Returns the list of callbacks for a single hook
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*
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* @param string $name Name of the hook
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* @return array
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*/
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public static function getByName($name)
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{
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$return = [];
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if (isset(self::$hooks[$name])) {
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$return = self::$hooks[$name];
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}
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return $return;
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}
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/**
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* Forks a hook.
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*
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* Use this function when you want to fork a hook via the worker.
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*
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* @param integer $priority of the hook
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* @param string $name of the hook to call
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* @param mixed $data to transmit to the callback handler
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function fork($priority, $name, $data = null)
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{
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if (array_key_exists($name, self::$hooks)) {
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foreach (self::$hooks[$name] as $hook) {
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// Call a hook to check if this hook call needs to be forked
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if (array_key_exists('hook_fork', self::$hooks)) {
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$hookdata = ['name' => $name, 'data' => $data, 'execute' => true];
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foreach (self::$hooks['hook_fork'] as $fork_hook) {
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if ($hook[0] != $fork_hook[0]) {
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continue;
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}
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self::callSingle(DI::app(), 'hook_fork', $fork_hook, $hookdata);
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}
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if (!$hookdata['execute']) {
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continue;
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}
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}
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Worker::add($priority, 'ForkHook', $name, $hook, $data);
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}
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}
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}
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/**
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* Calls a hook.
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*
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* Use this function when you want to be able to allow a hook to manipulate
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* the provided data.
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*
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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
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function callAll($name, &$data = null)
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{
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if (array_key_exists($name, self::$hooks)) {
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foreach (self::$hooks[$name] as $hook) {
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self::callSingle(DI::app(), $name, $hook, $data);
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}
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}
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}
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/**
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* Calls a single hook.
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*
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* @param App $a
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* @param string $name of the hook to call
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* @param array $hook Hook data
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* @param string|array &$data to transmit to the callback handler
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function callSingle(App $a, $name, $hook, &$data = null)
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{
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// Don't run a theme's hook if the user isn't using the theme
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if (strpos($hook[0], 'view/theme/') !== false && strpos($hook[0], 'view/theme/' . $a->getCurrentTheme()) === false) {
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return;
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}
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@include_once($hook[0]);
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if (function_exists($hook[1])) {
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$func = $hook[1];
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$func($a, $data);
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} else {
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// remove orphan hooks
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$condition = ['hook' => $name, 'file' => $hook[0], 'function' => $hook[1]];
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DBA::delete('hook', $condition, ['cascade' => false]);
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}
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}
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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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*
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* @param string $name Name of the addon
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* @return boolean
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*/
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public static function isAddonApp($name)
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{
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$name = Strings::sanitizeFilePathItem($name);
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if (array_key_exists('app_menu', self::$hooks)) {
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foreach (self::$hooks['app_menu'] as $hook) {
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if ($hook[0] == 'addon/' . $name . '/' . $name . '.php') {
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return true;
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}
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}
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}
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return false;
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}
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}
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