mirror of
https://gitlab.easter-eggs.com/ee/ldapsaisie.git
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325 lines
10 KiB
PHP
325 lines
10 KiB
PHP
<?php
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/*******************************************************************************
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* Copyright (C) 2007 Easter-eggs
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* http://ldapsaisie.labs.libre-entreprise.org
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*
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* Author: See AUTHORS file in top-level directory.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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******************************************************************************/
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LSsession :: loadLSclass('LSurlRequest');
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/**
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* URL Routing Manager for LdapSaisie
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*
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* @author Benjamin Renard <brenard@easter-eggs.com>
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*/
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class LSurl {
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/*
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* Configured URL patterns :
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*
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* array (
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* '[URL pattern]' => '[handler]',
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* [...]
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* )
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*
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* Example :
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*
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* array (
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* '|get/(?P<name>[a-zA-Z0-9]+)$|' => array (
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* 'handler' => 'get',
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* 'authenticated' => true,
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* ),
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* '|get/all$|' => => array (
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* 'handler' => 'get_all',
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* 'authenticated' => true,
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* ),
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* )
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*
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*/
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private static $patterns = array();
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// Rewrited request param
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const REWRITED_REQUEST_PARAM = 'REQUESTED_URL';
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/**
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* Add an URL pattern
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*
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* @param[in] $pattern string The URL pattern (required)
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* @param[in] $handler callable The URL pattern handler (must be callable, required)
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* @param[in] $authenticated boolean Permit to define if this URL is accessible only for authenticated users (optional, default: true)
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* @param[in] $override boolean Allow override if a command already exists with the same name (optional, default: false)
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**/
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public static function add_handler($pattern, $handler=null, $authenticated=true, $override=true) {
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if (is_array($pattern)) {
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if (is_null($handler))
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foreach($pattern as $p => $h)
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self :: add_handlers($p, $h, $override);
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else
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foreach($pattern as $p)
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self :: add_handlers($p, $handler, $override);
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}
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else {
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if (!isset(self :: $patterns[$pattern])) {
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self :: $patterns[$pattern] = array(
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'handler' => $handler,
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'authenticated' => $authenticated,
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);
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}
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elseif ($override) {
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LSlog :: debug("URL : override pattern '$pattern' with handler '$handler' (old handler = '".self :: $patterns[$pattern]."')");
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self :: $patterns[$pattern] = array(
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'handler' => $handler,
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'authenticated' => $authenticated,
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);
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}
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else {
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LSlog :: debug("URL : pattern '$pattern' already defined : do not override.");
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}
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}
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}
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/**
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* Interprets the requested URL and return the corresponding LSurlRequest object
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*
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* @param[in] $default_url string|null The default URL if current one does not
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* match with any configured pattern.
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*
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* @retval LSurlRequest The LSurlRequest object corresponding to the the requested URL.
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**/
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private static function get_request($default_url=null) {
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$current_url = self :: get_current_url();
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if (is_null($current_url)) {
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LSlog :: fatal(_("Fail to determine the requested URL."));
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exit();
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}
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if (!is_array(self :: $patterns)) {
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LSlog :: fatal('No URL patterns configured !');
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exit();
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}
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LSlog :: debug("URL : current url = '$current_url'");
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LSlog :: debug("URL : check current url with the following URL patterns :\n - ".implode("\n - ", array_keys(self :: $patterns)));
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foreach (self :: $patterns as $pattern => $handler_infos) {
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$m = self :: url_match($pattern, $current_url);
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if (is_array($m)) {
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$request = new LSurlRequest($current_url, $handler_infos, $m);
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// Reset last redirect
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if (isset($_SESSION['last_redirect']))
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unset($_SESSION['last_redirect']);
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LSlog :: debug("URL : result :\n".varDump($request, 1));
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return $request;
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}
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}
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if (!is_null($default_url)) {
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LSlog :: debug("Current URL match with no pattern. Redirect to default URL ('$default_url')");
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self :: redirect($default_url);
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exit();
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}
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LSlog :: debug("Current URL match with no pattern. Use error 404 handler.");
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return new LSurlRequest(
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$current_url,
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array(
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'handler' => array('LSurl', 'error_404'),
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'authenticated' => false,
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)
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);
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}
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/**
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* Check if the current requested URL match with a specific pattern
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*
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* @param[in] $pattern string The URL pattern
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* @param[in] $current_url string|false The current URL (optional)
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*
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* @retval array|false The URL info if pattern matched, false otherwise.
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**/
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private static function url_match($pattern, $current_url=false) {
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if ($current_url === false) {
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$current_url = self :: get_current_url();
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if (!$current_url) return False;
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}
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if (preg_match($pattern, $current_url, $m)) {
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LSlog :: debug("URL : Match found with pattern '$pattern' :\n\t".str_replace("\n", "\n\t", print_r($m, 1)));
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return $m;
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}
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return False;
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}
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/**
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* Get the current requested URL
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*
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* @retval string The current requested URL
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**/
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public static function get_current_url() {
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if (array_key_exists(self :: REWRITED_REQUEST_PARAM, $_REQUEST))
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return $_REQUEST[self :: REWRITED_REQUEST_PARAM];
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LSlog :: warning('LSurl : Rewrite request param not present, try to detect current URL.');
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return self :: detect_current_url();
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}
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/**
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* Trigger redirect to specified URL (or homepage if omited)
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*
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* @param[in] $go string|false The destination URL
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*
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* @retval void
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**/
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public static function redirect($go=false) {
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$public_root_url = LSconfig :: get('public_root_url', '/', 'string');
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if ($go===false)
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$go = "";
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if (preg_match('#^https?://#',$go)) {
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$url = $go;
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}
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else {
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// Check $public_root_url end
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if (substr($public_root_url, -1)=='/') {
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$public_root_url=substr($public_root_url, 0, -1);
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}
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$url="$public_root_url/$go";
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}
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// Prevent loop
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if (isset($_SESSION['last_redirect']) && $_SESSION['last_redirect'] == $url)
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LSlog :: fatal(_("Fail to determine the requested URL (loop detected)."));
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else
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$_SESSION['last_redirect'] = $url;
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LSlog :: debug("redirect($go) => Redirect to : <$url>");
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header("Location: $url");
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exit();
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}
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/**
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* Error 404 handler
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*
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* @param[in] $request LSurlRequest|null The request (optional, default: null)
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*
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* @retval void
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**/
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public static function error_404($request=null) {
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LSsession :: setTemplate('error_404.tpl');
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LSsession :: displayTemplate();
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}
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/**
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* Handle the current requested URL
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*
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* @param[in] $default_url string|null The default URL if current one does not
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* match with any configured pattern.
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*
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* @retval void
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**/
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public static function handle_request($default_url=null) {
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$request = self :: get_request($default_url);
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if (!is_callable($request -> handler)) {
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LSlog :: error("URL handler function ".$request -> handler."() does not exists !");
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LSlog :: fatal("This request could not be handled.");
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}
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if (class_exists('LStemplate'))
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LStemplate :: assign('request', $request);
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// Check authentication (if need)
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if($request -> authenticated && ! LSsession :: startLSsession()) {
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LSsession :: setTemplate('login.tpl');
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LSsession :: displayTemplate();
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return true;
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}
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try {
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return call_user_func($request -> handler, $request);
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}
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catch (Exception $e) {
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LSlog :: exception($e, "An exception occured running URL handler function ".$request -> handler."()");
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LSlog :: fatal("This request could not be processed correctly.");
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}
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}
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/**
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* Helpers to detect current requested URL
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*/
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/*
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* Try to detect current requested URL
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*
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* @retval string|false The current request URL or false if detection fail
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**/
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private static function detect_current_url() {
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LSlog :: debug("URL : request URI = '".$_SERVER['REQUEST_URI']."'");
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$base = self :: get_rewrite_base();
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LSlog :: debug("URL : rewrite base = '$base'");
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if ($_SERVER['REQUEST_URI'] == $base)
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return '';
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if (substr($_SERVER['REQUEST_URI'], 0, strlen($base)) != $base) {
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LSlog :: error("URL : request URI (".$_SERVER['REQUEST_URI'].") does not start with rewrite base ($base)");
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return False;
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}
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$current_url = substr($_SERVER['REQUEST_URI'], strlen($base));
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// URL contain params ?
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$params_start = strpos($current_url, '?');
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if ($params_start !== false) {
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// Params detected, remove it
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// No url / currrent url start by '?' ?
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if ($params_start == 0)
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return '';
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else
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return substr($current_url, 0, $params_start);
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}
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return $current_url;
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}
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/**
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* Try to detect rewrite base from public root URL
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*
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* @retval string The detected rewrite base
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**/
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private static function get_rewrite_base() {
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$public_root_url = LSconfig :: get('public_root_url', '/', 'string');
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if (preg_match('|^https?://[^/]+/(.*)$|', $public_root_url, $m))
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return '/'.self :: remove_trailing_slash($m[1]).'/';
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elseif (preg_match('|^/(.+)$|', $public_root_url, $m))
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return '/'.self :: remove_trailing_slash($m[1]).'/';
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return '/';
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}
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/**
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* Remove trailing slash in specified URL
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*
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* @param[in] $url string The URL
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*
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* @retval string The specified URL without trailing slash
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**/
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private static function remove_trailing_slash($url) {
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if ($url == '/')
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return $url;
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elseif (substr($url, -1) == '/')
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return substr($url, 0, -1);
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return $url;
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}
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}
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