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<?php
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/*
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* Gallery - a web based photo album viewer and editor
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* Copyright (C) 2000-2006 Bharat Mediratta
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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 General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/**
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* @version $Revision: 1.1.6.1 $ $Date: 2007/04/15 20:51:36 $
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* @package GalleryCore
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* @author Andy Staudacher <ast@gmx.ch>
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*/
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/**
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* A collection of useful G2Embed related utilities to find the correct GalleryEmbed::init
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* parameters
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*
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* @package GalleryCore
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* @subpackage GalleryEmbed
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* @static
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*/
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class G2EmbedDiscoveryUtilities {
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/**
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* Documentation:
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* To use GalleryEmbed and its GalleryEmbed::init method to initialize G2, you need:
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* a) the absolute filesystem path to embed.php
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* b) embedUri, the URL of the entry point to your embedding application / embedded G2
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* e.g. http://example.com/ or just / , or http://example.com/index.php?mod=gallery
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* c) g2Uri, the URL path to G2, e.g. http://example.com/gallery2/ or just /gallery2/
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*
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* Methods to finding out the path to embed.php:
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* ============================================
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*
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* - It's a good assumption that you can find out or define embedUri easily
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* - g2Uri must be entered by the admin that configures the integration, just copy and paste
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* the URL of G2
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* - finding out embed.php is a little tricky.
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*
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* We offer two methods to get embed.php. Do NOT call them for each request. Call them once
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* when configuring / installing your integration. Else you get a performance penalty.
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*
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* 1. If you ask the user to enter the g2Uri, you can call:
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* list ($success, $embedPhpPath, $errorString) =
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* G2EmbedDiscoveryUtilities::getG2EmbedPathByG2Uri($g2Uri);
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* if (!$success) {
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* print $errorString;
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* /* Tell the admin to enter the correct input
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* } else {
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* /* embedPhpPath is correct and you can store it in your config for later use
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* }
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*
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* 2. If you ask only for the g2Uri, you also need to provide the filesystem path to the
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* entry point (the filesystem path to the file that embedUri points to)
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* list ($success, $embedPhpPath, $errorString) =
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* G2EmbedDiscoveryUtilities::getG2EmbedPathByG2UriEmbedUriAndLocation(
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* $g2Uri, $embedUri, dirname(dirname(__FILE__)));
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* if (!$success) {
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* print $errorString;
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* /* Tell the admin to enter the correct input
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* } else {
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* /* embedPhpPath is correct and you can store it in your config for later use
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* }
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* Disadvantage of this method: it's less reliable. It won't work with Apache Alias,
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* or with subdomains, ...
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*
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*
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* Method to normalize the g2Uri and embedUri before using them in GalleryEmbed::init:
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* ==================================================================================
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*
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* Do NOT call them on each request. Call them once to verify / sanitize user input
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* and then store them in your configuration.
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* - These methods try their best to be tolerant to common user mistakes and return a
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* string that GalleryEmbd::init accepts
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* - You don't have to call these methods before calling the above methods to get
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* embed.php, since it does that already internally
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*
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* 1. $g2Uri = G2EmbedDiscoveryUtilities::normalizeG2Uri($g2Uri);
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* 2. $embedUri = G2EmbedDiscoveryUtilities::normalizeEmbedUri($embedUri);
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*/
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/**
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* The format for g2Uri accepted by GalleryEmbed::init is quite strict and well defined
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* missing traling / leading slashes have a meaning.
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* This function is more tolerant for incorrect user input and tries to normalize the
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* given g2Uri to a value that is probably what the user meant to provide
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*
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* The returned URI is either a server-relative URI (e.g. /gallery2/) or an absolute URI
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* including the schema (e.g. http://example.com/gallery/)
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*
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* The file / query string part is always removed)
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*
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* @param string g2Uri
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* @return string normalized g2Uri
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*/
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function normalizeG2Uri($g2Uri) {
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list ($schemaAndHost, $path, $file, $queryString, $fragment) =
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G2EmbedDiscoveryUtilities::_normalizeUri($g2Uri);
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return $schemaAndHost . $path;
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}
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/**
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* @see normalizeG2Uri
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*
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* Very similar, but file / query string is kept in the result
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*/
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function normalizeEmbedUri($embedUri) {
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list ($schemaAndHost, $path, $file, $queryString, $fragment) =
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G2EmbedDiscoveryUtilities::_normalizeUri($embedUri);
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return $schemaAndHost . $path . $file . $queryString . $fragment;
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}
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/**
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* Find the absolute filesystem path to G2's embed.php when given the g2Uri
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*
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* Returns false if the g2Uri is wrong. Can also fail if G2 and emApp are
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* on different (sub)domains / IPs
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*
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* @param string the g2Uri, a full URL or a server-relative URI
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* @return array boolean success,
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* string filesystem path of embed.php
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* string error string
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*/
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function getG2EmbedPathByG2Uri($g2Uri) {
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$g2Uri = trim($g2Uri);
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if (empty($g2Uri)) {
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return array (false, null, "Bad parameter: the provided g2Uri is empty");
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}
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$g2Uri = G2EmbedDiscoveryUtilities::normalizeG2Uri($g2Uri);
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/* Add a schema / host part to the g2Uri if necessary */
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if (strpos($g2Uri, 'http') !== 0) {
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$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? 'https' : 'http';
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$host = !empty($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '127.0.0.1';
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$g2Uri = sprintf('%s://%s%s', $protocol, $host, $g2Uri);
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}
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$components = @parse_url($g2Uri);
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if (!$components) {
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return array(false, null, "Unable to parse normalized URL $g2Uri. Please enter the " .
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"full address of your Gallery 2 installation.");
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}
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$port = empty($components['port']) ? 80 : $components['port'];
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if (empty($components['path'])) {
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$components['path'] = '/';
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}
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$fd = @fsockopen($components['host'], $port, $errno, $errstr, 1);
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if (empty($fd)) {
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return array(false, null, "Error $errno: '$errstr' retrieving $g2Uri");
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}
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$get = $components['path'] . 'embed.php?getEmbedPath=1';
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/* Read the web page into a buffer */
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$ok = fwrite($fd, sprintf("GET %s HTTP/1.0\r\n" .
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"Host: %s\r\n" .
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"\r\n",
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$get,
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$components['host']));
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if (!$ok) {
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/* Zero bytes written or false was returned */
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$errorStr = "Verification of Gallery 2 location failed. fwrite call failed for $g2Uri";
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if ($ok === false) {
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$errorStr .= "\nreturn value was false";
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}
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return array(false, null, $errorStr);
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}
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$ok = fflush($fd);
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if (!$ok) {
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if (version_compare(phpversion(), '4.2.0', '>=')) {
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/* Ignore false returned from fflush on PHP 4.1 */
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return array(false, null, "Verification of Gallery 2 location failed. " .
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"fflush call failed for $g2Uri");
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}
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}
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/*
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* Read the response code. fgets stops after newlines.
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* The first line contains only the status code (200, 404, etc.).
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*/
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$headers = array();
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$response = trim(fgets($fd, 4096));
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/* if the HTTP response code did not begin with a 2 this request was not successful */
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if (!preg_match("/^HTTP\/\d+\.\d+\s2\d{2}/", $response)) {
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return array(false, null, "URL derived from $g2Uri is invalid");
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}
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/* Read the headers. */
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while (!feof($fd)) {
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$line = trim(fgets($fd, 4096));
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if (empty($line)) {
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break;
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}
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/* Normalize the line endings */
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$line = str_replace("\r", '', $line);
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list ($key, $value) = explode(':', $line, 2);
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$headers[$key] = trim($value);
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}
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$embedPhpPath = '';
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if (isset($headers['X-G2-EMBED-PATH'])) {
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$embedPhpPath = $headers['X-G2-EMBED-PATH'];
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} else {
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return array(false, null, "Either your server does not support the automated " .
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"verification of the Gallery 2 location or the supplied g2Uri " .
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"points to a incompatible Gallery 2 version (older than 2.1)");
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}
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if (empty($embedPhpPath)) {
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return array(false, null, "Correct URL, but the returned " .
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"embed.php path is empty (server error?!)");
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}
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/* Verify path */
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list ($ok, $errorString) = @G2EmbedDiscoveryUtilities::isFileReadable($embedPhpPath);
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if (!$ok) {
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return array(false, null, $errorString);
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} else {
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return array(true, $embedPhpPath, null);
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}
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}
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/**
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* Get the absolute filesystem path to embed.php from the given g2Uri, embedUri and the
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* absolute filesystem path of the entry point file of your embedding application
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*
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* Can be unreliable if short URLs are entered or if apache alias / symlinks are used
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*
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* @param string g2Uri
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* @param string embedUri
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* @param string the dirname of the location of the entry point of your embedding application
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* e.g. dirname(__FILE__) if your embedUri points right to your wrapper file or if your
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* wrapper file is in the same directory as the entry point to your emApp
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* e.g. dirname(dirname(dirname(__FILE__))) if your wrapper is in a
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* modules/g2integration/wrapper.inc.php file, which is 2 subdirectories deeper than
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* the actual entry point that embedUri is pointing to
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* @return array boolean success,
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* string absolute filesystem path to embed.php,
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* string errorString
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*/
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function getG2EmbedPathByG2UriEmbedUriAndLocation($g2Uri, $embedUri, $dirnameOfEmApp) {
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if (empty($dirnameOfEmApp)) {
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return array(false, null, 'dirname of embedding application is empty');
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}
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/* Normalize g2Uri, embedUri */
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list ($schemaAndHost, $path, $file, $queryString, $fragment) =
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G2EmbedDiscoveryUtilities::_normalizeUri($g2Uri);
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$g2Path = $path;
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list ($schemaAndHost, $path, $file, $queryString, $fragment) =
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G2EmbedDiscoveryUtilities::_normalizeUri($embedUri);
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$embedPath = $path;
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/* Normalize path separators */
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$dirnameOfEmApp = str_replace(DIRECTORY_SEPARATOR, '/', $dirnameOfEmApp);
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/* Remove trailing slash */
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if (substr($dirnameOfEmApp, -1) == '/') {
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$dirnameOfEmApp = substr($dirnameOfEmApp, 0, strlen($dirnameOfEmApp) - 1);
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}
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/*
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* Do some directory traversal to translate g2Path + embedPath + dirnameOfEmApp
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* to path to embed.php
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* path
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* Example: g2Path = /baz/bar/gallery2/ , embedPath = /baz/cms/foo/ ,
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* dirnameOfEmApp = /home/john/www/cms/foo/
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* 1. Remove as many dirs from the end of dirnameOfEmApp as embedPath has
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* 2. append g2Path to dirnameOfEmApp
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*/
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$numberOfSubDirs = count(explode('/', $embedPath));
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/* Don't count the one before the leading and after the traling slash */
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$numberOfSubDirs -= 2;
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$pathElements = explode('/', $dirnameOfEmApp);
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$max = 30; /* prevent infinite loop */
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while ($numberOfSubDirs-- > 0 && $max-- > 0) {
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array_pop($pathElements);
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}
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$embedPhpPath = join('/', $pathElements) . $g2Path . 'embed.php';
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/* Convert / back to platform specific directory separator */
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$embedPhpPath = str_replace('/', DIRECTORY_SEPARATOR, $embedPhpPath);
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/* Verify path */
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list ($ok, $errorString) = @G2EmbedDiscoveryUtilities::isFileReadable($embedPhpPath);
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if (!$ok) {
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return array(false, null, $errorString);
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} else {
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return array(true, $embedPhpPath, null);
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}
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}
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/**
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* Helper function for normalizeG2Uri and normalizeEmbedUri
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*
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* @access private
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*/
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function _normalizeUri($uri) {
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$uri = trim($uri);
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if (empty($uri)) {
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return array('', '/', '', '', '');
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}
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$schema = $host = $schemaAndHost = $path = $file = '';
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$fragment = $queryString = '';
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/* Normalize path separators */
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$uri = str_replace("\\", '/', $uri);
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/*
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* With schema (http://) -> easy to identify host
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* A single slash:
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* www.example.com/
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* www.example.com/gallery2
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* www.example.com/index.php
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* gallery2/
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* /
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* /gallery2
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* /index.php
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* gallery2/index.php
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* Multiple slashes:
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* www.example.com/gallery2/
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* /gallery2/
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* ....
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* Problem: Differentiate between host, path and file
|
| 343 |
* @files: .php|.html? is recognized as file
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* @host: (?:\w+:\w+@)[\w\.]*\w+\.\w{2-4}(?::\d+) is most likely a host string
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| 345 |
* localhost or other host strings without a dot are impossible to
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| 346 |
* differentiate from path names ->only http://localhost accepted
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* @path: everything that is not a file or a host
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*/
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/* Remove fragment / query string */
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if (($pos = strpos($uri, '#')) !== false) {
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$fragment = substr($uri, $pos);
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$uri = substr($uri, 0, $pos);
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}
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if (($pos = strpos($uri, '?')) !== false) {
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$queryString = substr($uri, $pos);
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$uri = substr($uri, 0, $pos);
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}
|
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/* Handle and remove file part */
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if (preg_match('{(.*/)?([\w\.]+\.(?:php|html?))$}i', $uri, $matches)) {
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$uri = empty($matches[1]) ? '/' : $matches[1];
|
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$file = $matches[2];
|
| 364 |
}
|
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/* Get the schema and host for absolute URLs */
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if (preg_match('{^(https?://)([^/]+)(.*)$}i', $uri, $matches)) {
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$schema = strtolower($matches[1]);
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$host = $matches[2];
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$schemaAndHost = $schema . $host;
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$uri = empty($matches[3]) ? '/' : $matches[3];
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$uri = $uri{0} != '/' ? '/' . $uri : $uri;
|
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} else {
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/* Get the host string, e.g. from www.example.com/foo or www.example.com */
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if (preg_match('{^((?:\w+:\w+@)?[\w\.]*\w+\.\w+(?::\d+)?)(.*)$}', $uri, $matches)) {
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$host = $matches[1];
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$schema = 'http://';
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if ( !empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
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$schema = 'https://';
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}
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$schemaAndHost = $schema . $host;;
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$uri = empty($matches[2]) ? '/' : $matches[2];
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$uri = $uri{0} != '/' ? '/' . $uri : $uri;
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}
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}
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/* Add leading / trailing slash to path */
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$path = $uri{0} != '/' ? '/' . $uri : $uri;
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$path .= substr($path, -1) != '/' ? '/' : '';
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return array($schemaAndHost, $path, $file, $queryString, $fragment);
|
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}
|
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|
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function isFileReadable($path) {
|
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if (@file_exists($path) && @is_readable($path)) {
|
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return array(true, null);
|
| 397 |
} else if (@G2EmbedDiscoveryUtilities::_isRestrictedByOpenBaseDir($path)) {
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return array(false, "file $path is restricted by PHP open_basedir");
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} else if (@file_exists($path) && !@is_readable($path)) {
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| 400 |
return array(false, "file $path exists but is not readable");
|
| 401 |
} else {
|
| 402 |
return array(false, "file $path does not exist");
|
| 403 |
}
|
| 404 |
}
|
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/**
|
| 407 |
* Return true if the path provided is not allowed by the current open_basedir configuration.
|
| 408 |
*
|
| 409 |
* Copied from GalleryPlatform and adjusted to be independent of the G2 framework
|
| 410 |
*
|
| 411 |
* @return true if the path is restricted
|
| 412 |
*/
|
| 413 |
function _isRestrictedByOpenBaseDir($path) {
|
| 414 |
$slash = DIRECTORY_SEPARATOR;
|
| 415 |
if (!strncasecmp(PHP_OS, 'win', 3)) {
|
| 416 |
$separator = ';';
|
| 417 |
$caseSensitive = false;
|
| 418 |
} else {
|
| 419 |
$separator = ':';
|
| 420 |
$caseSensitive = true;
|
| 421 |
}
|
| 422 |
|
| 423 |
$openBasedir = @ini_get('open_basedir');
|
| 424 |
if (empty($openBasedir)) {
|
| 425 |
return false;
|
| 426 |
}
|
| 427 |
|
| 428 |
if (($realpath = realpath($path)) === false) {
|
| 429 |
/*
|
| 430 |
* PHP's open_basedir will actually take an invalid path, resolve relative
|
| 431 |
* paths, parse out .. and . and then check against the dir list..
|
| 432 |
* Here we do an ok job of doing the same, though it isn't perfect.
|
| 433 |
*/
|
| 434 |
$s = '\\\/'; /* do this by hand because preg_quote() isn't reliable */
|
| 435 |
if (!preg_match("{^([a-z]+:)?[$s]}i", $path)) {
|
| 436 |
$path = getcwd() . $slash . $path;
|
| 437 |
}
|
| 438 |
for ($realpath = $path, $lastpath = ''; $realpath != $lastpath;) {
|
| 439 |
$realpath = preg_replace("#[$s]\.([$s]|\$)#", $slash, $lastpath = $realpath);
|
| 440 |
}
|
| 441 |
|
| 442 |
for ($lastpath = ''; $realpath != $lastpath;) {
|
| 443 |
$realpath = preg_replace("#[$s][^$s]+[$s]\.\.([$s]|\$)#",
|
| 444 |
$slash, $lastpath = $realpath);
|
| 445 |
}
|
| 446 |
}
|
| 447 |
|
| 448 |
$function = $caseSensitive ? 'strncmp' : 'strncasecmp';
|
| 449 |
foreach (explode($separator, $openBasedir) as $baseDir) {
|
| 450 |
if (($baseDirMatch = realpath($baseDir)) === false) {
|
| 451 |
$baseDirMatch = $baseDir;
|
| 452 |
} else if ($baseDir{strlen($baseDir)-1} == $slash) {
|
| 453 |
/* Realpath will remove a trailing slash.. add it back to avoid prefix match */
|
| 454 |
$baseDirMatch .= $slash;
|
| 455 |
}
|
| 456 |
/* Add slash on path so /dir is accepted if /dir/ is a valid basedir */
|
| 457 |
if (!$function($baseDirMatch, $realpath . $slash, strlen($baseDirMatch))) {
|
| 458 |
return false;
|
| 459 |
}
|
| 460 |
}
|
| 461 |
|
| 462 |
return true;
|
| 463 |
}
|
| 464 |
}
|
| 465 |
|
| 466 |
?>
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