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efrain |
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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle 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 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Implementation of zip packer.
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*
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* @package core_files
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* @copyright 2008 Petr Skoda (http://skodak.org)
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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require_once("$CFG->libdir/filestorage/file_packer.php");
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require_once("$CFG->libdir/filestorage/zip_archive.php");
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/**
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* Utility class - handles all zipping and unzipping operations.
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*
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* @package core_files
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* @category files
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* @copyright 2008 Petr Skoda (http://skodak.org)
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class zip_packer extends file_packer {
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/**
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* Zip files and store the result in file storage.
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*
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* @param array $files array with full zip paths (including directory information)
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* as keys (archivepath=>ospathname or archivepath/subdir=>stored_file or archivepath=>array('content_as_string'))
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* @param int $contextid context ID
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* @param string $component component
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* @param string $filearea file area
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* @param int $itemid item ID
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* @param string $filepath file path
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* @param string $filename file name
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* @param int $userid user ID
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* @param bool $ignoreinvalidfiles true means ignore missing or invalid files, false means abort on any error
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* @param file_progress $progress Progress indicator callback or null if not required
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* @return stored_file|bool false if error stored_file instance if ok
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*/
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public function archive_to_storage(array $files, $contextid,
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$component, $filearea, $itemid, $filepath, $filename,
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$userid = NULL, $ignoreinvalidfiles=true, file_progress $progress = null) {
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global $CFG;
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$fs = get_file_storage();
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check_dir_exists($CFG->tempdir.'/zip');
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$tmpfile = tempnam($CFG->tempdir.'/zip', 'zipstor');
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if ($result = $this->archive_to_pathname($files, $tmpfile, $ignoreinvalidfiles, $progress)) {
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if ($file = $fs->get_file($contextid, $component, $filearea, $itemid, $filepath, $filename)) {
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if (!$file->delete()) {
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@unlink($tmpfile);
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return false;
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}
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}
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$file_record = new stdClass();
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$file_record->contextid = $contextid;
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$file_record->component = $component;
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$file_record->filearea = $filearea;
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$file_record->itemid = $itemid;
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$file_record->filepath = $filepath;
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$file_record->filename = $filename;
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$file_record->userid = $userid;
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$file_record->mimetype = 'application/zip';
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$result = $fs->create_file_from_pathname($file_record, $tmpfile);
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}
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@unlink($tmpfile);
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return $result;
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}
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/**
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* Zip files and store the result in os file.
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*
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* @param array $files array with zip paths as keys (archivepath=>ospathname or archivepath=>stored_file or archivepath=>array('content_as_string'))
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* @param string $archivefile path to target zip file
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* @param bool $ignoreinvalidfiles true means ignore missing or invalid files, false means abort on any error
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* @param file_progress $progress Progress indicator callback or null if not required
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* @return bool true if file created, false if not
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*/
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public function archive_to_pathname(array $files, $archivefile,
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$ignoreinvalidfiles=true, file_progress $progress = null) {
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$ziparch = new zip_archive();
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if (!$ziparch->open($archivefile, file_archive::OVERWRITE)) {
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return false;
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}
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$abort = false;
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foreach ($files as $archivepath => $file) {
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$archivepath = trim($archivepath, '/');
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// Record progress each time around this loop.
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if ($progress) {
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$progress->progress();
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}
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if (is_null($file)) {
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// Directories have null as content.
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if (!$ziparch->add_directory($archivepath.'/')) {
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debugging("Can not zip '$archivepath' directory", DEBUG_DEVELOPER);
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if (!$ignoreinvalidfiles) {
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$abort = true;
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break;
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}
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}
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} else if (is_string($file)) {
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if (!$this->archive_pathname($ziparch, $archivepath, $file, $progress)) {
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debugging("Can not zip '$archivepath' file", DEBUG_DEVELOPER);
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if (!$ignoreinvalidfiles) {
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$abort = true;
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break;
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}
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}
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} else if (is_array($file)) {
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$content = reset($file);
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if (!$ziparch->add_file_from_string($archivepath, $content)) {
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debugging("Can not zip '$archivepath' file", DEBUG_DEVELOPER);
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if (!$ignoreinvalidfiles) {
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$abort = true;
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break;
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}
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}
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} else {
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if (!$this->archive_stored($ziparch, $archivepath, $file, $progress)) {
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debugging("Can not zip '$archivepath' file", DEBUG_DEVELOPER);
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if (!$ignoreinvalidfiles) {
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$abort = true;
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break;
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}
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}
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}
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}
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if (!$ziparch->close()) {
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@unlink($archivefile);
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return false;
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}
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if ($abort) {
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@unlink($archivefile);
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return false;
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}
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return true;
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}
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/**
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* Perform archiving file from stored file.
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*
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* @param zip_archive $ziparch zip archive instance
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* @param string $archivepath file path to archive
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* @param stored_file $file stored_file object
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* @param file_progress $progress Progress indicator callback or null if not required
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* @return bool success
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*/
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private function archive_stored($ziparch, $archivepath, $file, file_progress $progress = null) {
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$result = $file->archive_file($ziparch, $archivepath);
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if (!$result) {
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return false;
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}
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if (!$file->is_directory()) {
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return true;
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}
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$baselength = strlen($file->get_filepath());
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$fs = get_file_storage();
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$files = $fs->get_directory_files($file->get_contextid(), $file->get_component(), $file->get_filearea(), $file->get_itemid(),
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$file->get_filepath(), true, true);
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foreach ($files as $file) {
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// Record progress for each file.
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if ($progress) {
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$progress->progress();
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}
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$path = $file->get_filepath();
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$path = substr($path, $baselength);
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$path = $archivepath.'/'.$path;
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if (!$file->is_directory()) {
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$path = $path.$file->get_filename();
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}
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// Ignore result here, partial zipping is ok for now.
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$file->archive_file($ziparch, $path);
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}
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return true;
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}
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/**
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* Perform archiving file from file path.
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*
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* @param zip_archive $ziparch zip archive instance
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* @param string $archivepath file path to archive
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* @param string $file path name of the file
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* @param file_progress $progress Progress indicator callback or null if not required
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* @return bool success
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*/
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private function archive_pathname($ziparch, $archivepath, $file,
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file_progress $progress = null) {
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// Record progress each time this function is called.
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if ($progress) {
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$progress->progress();
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}
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if (!file_exists($file)) {
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return false;
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}
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if (is_file($file)) {
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if (!is_readable($file)) {
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return false;
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}
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return $ziparch->add_file_from_pathname($archivepath, $file);
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}
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if (is_dir($file)) {
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if ($archivepath !== '') {
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$ziparch->add_directory($archivepath);
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}
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$files = new DirectoryIterator($file);
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foreach ($files as $file) {
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if ($file->isDot()) {
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continue;
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}
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$newpath = $archivepath.'/'.$file->getFilename();
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$this->archive_pathname($ziparch, $newpath, $file->getPathname(), $progress);
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}
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unset($files); // Release file handles.
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return true;
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}
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}
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/**
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* Unzip file to given file path (real OS filesystem), existing files are overwritten.
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*
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* @todo MDL-31048 localise messages
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* @param string|stored_file $archivefile full pathname of zip file or stored_file instance
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* @param string $pathname target directory
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* @param array $onlyfiles only extract files present in the array. The path to files MUST NOT
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* start with a /. Example: array('myfile.txt', 'directory/anotherfile.txt')
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* @param file_progress $progress Progress indicator callback or null if not required
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* @param bool $returnbool Whether to return a basic true/false indicating error state, or full per-file error
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* details.
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* @return bool|array list of processed files; false if error
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*/
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public function extract_to_pathname($archivefile, $pathname,
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array $onlyfiles = null, file_progress $progress = null, $returnbool = false) {
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global $CFG;
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if (!is_string($archivefile)) {
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return $archivefile->extract_to_pathname($this, $pathname, $progress);
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}
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$processed = array();
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$success = true;
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$pathname = rtrim($pathname, '/');
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if (!is_readable($archivefile)) {
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return false;
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}
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$ziparch = new zip_archive();
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if (!$ziparch->open($archivefile, file_archive::OPEN)) {
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return false;
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}
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// Get the number of files (approx).
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if ($progress) {
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$approxmax = $ziparch->estimated_count();
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$done = 0;
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}
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foreach ($ziparch as $info) {
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// Notify progress.
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if ($progress) {
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$progress->progress($done, $approxmax);
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$done++;
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}
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$size = $info->size;
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$name = $info->pathname;
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$origname = $name;
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// File names cannot end with dots on Windows and trailing dots are replaced with underscore.
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if ($CFG->ostype === 'WINDOWS') {
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$name = preg_replace('~([^/]+)\.(/|$)~', '\1_\2', $name);
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}
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if ($name === '' or array_key_exists($name, $processed)) {
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// Probably filename collisions caused by filename cleaning/conversion.
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continue;
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} else if (is_array($onlyfiles) && !in_array($origname, $onlyfiles)) {
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// Skipping files which are not in the list.
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continue;
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}
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if ($info->is_directory) {
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$newdir = "$pathname/$name";
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// directory
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if (is_file($newdir) and !unlink($newdir)) {
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$processed[$name] = 'Can not create directory, file already exists'; // TODO: localise
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$success = false;
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continue;
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}
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if (is_dir($newdir)) {
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//dir already there
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$processed[$name] = true;
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} else {
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if (mkdir($newdir, $CFG->directorypermissions, true)) {
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$processed[$name] = true;
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} else {
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$processed[$name] = 'Can not create directory'; // TODO: localise
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$success = false;
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}
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}
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continue;
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}
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$parts = explode('/', trim($name, '/'));
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$filename = array_pop($parts);
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$newdir = rtrim($pathname.'/'.implode('/', $parts), '/');
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if (!is_dir($newdir)) {
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if (!mkdir($newdir, $CFG->directorypermissions, true)) {
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$processed[$name] = 'Can not create directory'; // TODO: localise
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$success = false;
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continue;
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}
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}
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$newfile = "$newdir/$filename";
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if (strpos($newfile, './') > 1 || $name !== $origname) {
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// The path to the entry contains a directory ending with dot. We cannot use extract_to() due to
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353 |
// upstream PHP bugs #69477, #74619 and #77214. Extract the file from its stream which is slower but
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354 |
// should work even in this case.
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355 |
if (!$fp = fopen($newfile, 'wb')) {
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$processed[$name] = 'Can not write target file'; // TODO: localise.
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357 |
$success = false;
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|
358 |
continue;
|
|
|
359 |
}
|
|
|
360 |
|
|
|
361 |
if (!$fz = $ziparch->get_stream($info->index)) {
|
|
|
362 |
$processed[$name] = 'Can not read file from zip archive'; // TODO: localise.
|
|
|
363 |
$success = false;
|
|
|
364 |
fclose($fp);
|
|
|
365 |
continue;
|
|
|
366 |
}
|
|
|
367 |
|
|
|
368 |
while (!feof($fz)) {
|
|
|
369 |
$content = fread($fz, 262143);
|
|
|
370 |
fwrite($fp, $content);
|
|
|
371 |
}
|
|
|
372 |
|
|
|
373 |
fclose($fz);
|
|
|
374 |
fclose($fp);
|
|
|
375 |
|
|
|
376 |
} else {
|
|
|
377 |
if (!$fz = $ziparch->extract_to($pathname, $info->index)) {
|
|
|
378 |
$processed[$name] = 'Can not read file from zip archive'; // TODO: localise.
|
|
|
379 |
$success = false;
|
|
|
380 |
continue;
|
|
|
381 |
}
|
|
|
382 |
}
|
|
|
383 |
|
|
|
384 |
// Check that the file was correctly created in the destination.
|
|
|
385 |
if (!file_exists($newfile)) {
|
|
|
386 |
$processed[$name] = 'Unknown error during zip extraction (file not created).'; // TODO: localise.
|
|
|
387 |
$success = false;
|
|
|
388 |
continue;
|
|
|
389 |
}
|
|
|
390 |
|
|
|
391 |
// Check that the size of extracted file matches the expectation.
|
|
|
392 |
if (filesize($newfile) !== $size) {
|
|
|
393 |
$processed[$name] = 'Unknown error during zip extraction (file size mismatch).'; // TODO: localise.
|
|
|
394 |
$success = false;
|
|
|
395 |
@unlink($newfile);
|
|
|
396 |
continue;
|
|
|
397 |
}
|
|
|
398 |
|
|
|
399 |
$processed[$name] = true;
|
|
|
400 |
}
|
|
|
401 |
|
|
|
402 |
$ziparch->close();
|
|
|
403 |
|
|
|
404 |
if ($returnbool) {
|
|
|
405 |
return $success;
|
|
|
406 |
} else {
|
|
|
407 |
return $processed;
|
|
|
408 |
}
|
|
|
409 |
}
|
|
|
410 |
|
|
|
411 |
/**
|
|
|
412 |
* Unzip file to given file path (real OS filesystem), existing files are overwritten.
|
|
|
413 |
*
|
|
|
414 |
* @todo MDL-31048 localise messages
|
|
|
415 |
* @param string|stored_file $archivefile full pathname of zip file or stored_file instance
|
|
|
416 |
* @param int $contextid context ID
|
|
|
417 |
* @param string $component component
|
|
|
418 |
* @param string $filearea file area
|
|
|
419 |
* @param int $itemid item ID
|
|
|
420 |
* @param string $pathbase file path
|
|
|
421 |
* @param int $userid user ID
|
|
|
422 |
* @param file_progress $progress Progress indicator callback or null if not required
|
|
|
423 |
* @return array|bool list of processed files; false if error
|
|
|
424 |
*/
|
|
|
425 |
public function extract_to_storage($archivefile, $contextid,
|
|
|
426 |
$component, $filearea, $itemid, $pathbase, $userid = NULL,
|
|
|
427 |
file_progress $progress = null) {
|
|
|
428 |
global $CFG;
|
|
|
429 |
|
|
|
430 |
if (!is_string($archivefile)) {
|
|
|
431 |
return $archivefile->extract_to_storage($this, $contextid, $component,
|
|
|
432 |
$filearea, $itemid, $pathbase, $userid, $progress);
|
|
|
433 |
}
|
|
|
434 |
|
|
|
435 |
check_dir_exists($CFG->tempdir.'/zip');
|
|
|
436 |
|
|
|
437 |
$pathbase = trim($pathbase, '/');
|
|
|
438 |
$pathbase = ($pathbase === '') ? '/' : '/'.$pathbase.'/';
|
|
|
439 |
$fs = get_file_storage();
|
|
|
440 |
|
|
|
441 |
$processed = array();
|
|
|
442 |
|
|
|
443 |
$ziparch = new zip_archive();
|
|
|
444 |
if (!$ziparch->open($archivefile, file_archive::OPEN)) {
|
|
|
445 |
return false;
|
|
|
446 |
}
|
|
|
447 |
|
|
|
448 |
// Get the number of files (approx).
|
|
|
449 |
if ($progress) {
|
|
|
450 |
$approxmax = $ziparch->estimated_count();
|
|
|
451 |
$done = 0;
|
|
|
452 |
}
|
|
|
453 |
|
|
|
454 |
foreach ($ziparch as $info) {
|
|
|
455 |
// Notify progress.
|
|
|
456 |
if ($progress) {
|
|
|
457 |
$progress->progress($done, $approxmax);
|
|
|
458 |
$done++;
|
|
|
459 |
}
|
|
|
460 |
|
|
|
461 |
$size = $info->size;
|
|
|
462 |
$name = $info->pathname;
|
|
|
463 |
|
|
|
464 |
if ($name === '' or array_key_exists($name, $processed)) {
|
|
|
465 |
//probably filename collisions caused by filename cleaning/conversion
|
|
|
466 |
continue;
|
|
|
467 |
}
|
|
|
468 |
|
|
|
469 |
if ($info->is_directory) {
|
|
|
470 |
$newfilepath = $pathbase.$name.'/';
|
|
|
471 |
$fs->create_directory($contextid, $component, $filearea, $itemid, $newfilepath, $userid);
|
|
|
472 |
$processed[$name] = true;
|
|
|
473 |
continue;
|
|
|
474 |
}
|
|
|
475 |
|
|
|
476 |
$parts = explode('/', trim($name, '/'));
|
|
|
477 |
$filename = array_pop($parts);
|
|
|
478 |
$filepath = $pathbase;
|
|
|
479 |
if ($parts) {
|
|
|
480 |
$filepath .= implode('/', $parts).'/';
|
|
|
481 |
}
|
|
|
482 |
|
|
|
483 |
if ($size < 2097151) {
|
|
|
484 |
// Small file.
|
|
|
485 |
if (!$fz = $ziparch->get_stream($info->index)) {
|
|
|
486 |
$processed[$name] = 'Can not read file from zip archive'; // TODO: localise
|
|
|
487 |
continue;
|
|
|
488 |
}
|
|
|
489 |
$content = '';
|
|
|
490 |
$realfilesize = 0;
|
|
|
491 |
while (!feof($fz)) {
|
|
|
492 |
$content .= fread($fz, 262143);
|
|
|
493 |
$realfilesize = strlen($content); // Current file size.
|
|
|
494 |
|
|
|
495 |
// More was read than was expected, which indicates a malformed/malicious archive.
|
|
|
496 |
// Break and let the error handling below take care of the file clean up.
|
|
|
497 |
if ($realfilesize > $size) {
|
|
|
498 |
break;
|
|
|
499 |
}
|
|
|
500 |
}
|
|
|
501 |
fclose($fz);
|
|
|
502 |
if (strlen($content) !== $size) {
|
|
|
503 |
$processed[$name] = 'Unknown error during zip extraction'; // TODO: localise
|
|
|
504 |
// something went wrong :-(
|
|
|
505 |
unset($content);
|
|
|
506 |
continue;
|
|
|
507 |
}
|
|
|
508 |
|
|
|
509 |
if ($file = $fs->get_file($contextid, $component, $filearea, $itemid, $filepath, $filename)) {
|
|
|
510 |
if (!$file->delete()) {
|
|
|
511 |
$processed[$name] = 'Can not delete existing file'; // TODO: localise
|
|
|
512 |
continue;
|
|
|
513 |
}
|
|
|
514 |
}
|
|
|
515 |
$file_record = new stdClass();
|
|
|
516 |
$file_record->contextid = $contextid;
|
|
|
517 |
$file_record->component = $component;
|
|
|
518 |
$file_record->filearea = $filearea;
|
|
|
519 |
$file_record->itemid = $itemid;
|
|
|
520 |
$file_record->filepath = $filepath;
|
|
|
521 |
$file_record->filename = $filename;
|
|
|
522 |
$file_record->userid = $userid;
|
|
|
523 |
if ($fs->create_file_from_string($file_record, $content)) {
|
|
|
524 |
$processed[$name] = true;
|
|
|
525 |
} else {
|
|
|
526 |
$processed[$name] = 'Unknown error during zip extraction'; // TODO: localise
|
|
|
527 |
}
|
|
|
528 |
unset($content);
|
|
|
529 |
continue;
|
|
|
530 |
|
|
|
531 |
} else {
|
|
|
532 |
// large file, would not fit into memory :-(
|
|
|
533 |
$tmpfile = tempnam($CFG->tempdir.'/zip', 'unzip');
|
|
|
534 |
if (!$fp = fopen($tmpfile, 'wb')) {
|
|
|
535 |
@unlink($tmpfile);
|
|
|
536 |
$processed[$name] = 'Can not write temp file'; // TODO: localise
|
|
|
537 |
continue;
|
|
|
538 |
}
|
|
|
539 |
if (!$fz = $ziparch->get_stream($info->index)) {
|
|
|
540 |
@unlink($tmpfile);
|
|
|
541 |
$processed[$name] = 'Can not read file from zip archive'; // TODO: localise
|
|
|
542 |
continue;
|
|
|
543 |
}
|
|
|
544 |
$realfilesize = 0;
|
|
|
545 |
while (!feof($fz)) {
|
|
|
546 |
$content = fread($fz, 262143);
|
|
|
547 |
$numofbytes = fwrite($fp, $content);
|
|
|
548 |
$realfilesize += $numofbytes; // Current file size.
|
|
|
549 |
|
|
|
550 |
// More was read than was expected, which indicates a malformed/malicious archive.
|
|
|
551 |
// Break and let the error handling below take care of the file clean up.
|
|
|
552 |
if ($realfilesize > $size) {
|
|
|
553 |
break;
|
|
|
554 |
}
|
|
|
555 |
}
|
|
|
556 |
fclose($fz);
|
|
|
557 |
fclose($fp);
|
|
|
558 |
if (filesize($tmpfile) !== $size) {
|
|
|
559 |
$processed[$name] = 'Unknown error during zip extraction'; // TODO: localise
|
|
|
560 |
// something went wrong :-(
|
|
|
561 |
@unlink($tmpfile);
|
|
|
562 |
continue;
|
|
|
563 |
}
|
|
|
564 |
|
|
|
565 |
if ($file = $fs->get_file($contextid, $component, $filearea, $itemid, $filepath, $filename)) {
|
|
|
566 |
if (!$file->delete()) {
|
|
|
567 |
@unlink($tmpfile);
|
|
|
568 |
$processed[$name] = 'Can not delete existing file'; // TODO: localise
|
|
|
569 |
continue;
|
|
|
570 |
}
|
|
|
571 |
}
|
|
|
572 |
$file_record = new stdClass();
|
|
|
573 |
$file_record->contextid = $contextid;
|
|
|
574 |
$file_record->component = $component;
|
|
|
575 |
$file_record->filearea = $filearea;
|
|
|
576 |
$file_record->itemid = $itemid;
|
|
|
577 |
$file_record->filepath = $filepath;
|
|
|
578 |
$file_record->filename = $filename;
|
|
|
579 |
$file_record->userid = $userid;
|
|
|
580 |
if ($fs->create_file_from_pathname($file_record, $tmpfile)) {
|
|
|
581 |
$processed[$name] = true;
|
|
|
582 |
} else {
|
|
|
583 |
$processed[$name] = 'Unknown error during zip extraction'; // TODO: localise
|
|
|
584 |
}
|
|
|
585 |
@unlink($tmpfile);
|
|
|
586 |
continue;
|
|
|
587 |
}
|
|
|
588 |
}
|
|
|
589 |
$ziparch->close();
|
|
|
590 |
return $processed;
|
|
|
591 |
}
|
|
|
592 |
|
|
|
593 |
/**
|
|
|
594 |
* Returns array of info about all files in archive.
|
|
|
595 |
*
|
|
|
596 |
* @param string|file_archive $archivefile
|
|
|
597 |
* @return array of file infos
|
|
|
598 |
*/
|
|
|
599 |
public function list_files($archivefile) {
|
|
|
600 |
if (!is_string($archivefile)) {
|
|
|
601 |
return $archivefile->list_files();
|
|
|
602 |
}
|
|
|
603 |
|
|
|
604 |
$ziparch = new zip_archive();
|
|
|
605 |
if (!$ziparch->open($archivefile, file_archive::OPEN)) {
|
|
|
606 |
return false;
|
|
|
607 |
}
|
|
|
608 |
$list = $ziparch->list_files();
|
|
|
609 |
$ziparch->close();
|
|
|
610 |
return $list;
|
|
|
611 |
}
|
|
|
612 |
|
|
|
613 |
}
|