mirror of
https://github.com/moodle/moodle.git
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419 lines
15 KiB
PHP
419 lines
15 KiB
PHP
<?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 moodlecore
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* @subpackage file-packer
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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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require_once("$CFG->libdir/packer/file_packer.php");
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require_once("$CFG->libdir/packer/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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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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* @param array $files array with full zip paths (including directory information) as keys (archivepath=>ospathname or archivepath/subdir=>stored_file)
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* @param int $contextid
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* @param string $filearea
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* @param int $itemid
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* @param string $filepath
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* @param string $filename
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* @return mixed false if error stored file instance if ok
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*/
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public function archive_to_storage($files, $contextid, $filearea, $itemid, $filepath, $filename, $userid=null) {
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global $CFG;
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$fs = get_file_storage();
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check_dir_exists($CFG->dataroot.'/temp/zip', true, true);
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$tmpfile = tempnam($CFG->dataroot.'/temp/zip', 'zipstor');
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if ($result = $this->archive_to_pathname($files, $tmpfile)) {
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if ($file = $fs->get_file($contextid, $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 object();
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$file_record->contextid = $contextid;
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$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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* @param array $files array with zip paths as keys (archivepath=>ospathname or archivepath=>stored_file)
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* @param string $archivefile path to target zip file
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* @return bool success
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*/
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public function archive_to_pathname($files, $archivefile) {
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global $CFG;
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if (!is_array($files)) {
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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($archivefile, file_archive::OVERWRITE)) {
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return false;
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}
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foreach ($files as $archivepath => $file) {
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$archivepath = trim($archivepath, '/');
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if (is_null($file)) {
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// empty directories have null as content
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$ziparch->add_directory($archivepath.'/');
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} else if (is_string($file)) {
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$this->archive_pathname($ziparch, $archivepath, $file);
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} else {
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$this->archive_stored($ziparch, $archivepath, $file);
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}
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}
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return $ziparch->close();
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}
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private function archive_stored($ziparch, $archivepath, $file) {
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$file->archive_file($ziparch, $archivepath);
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if (!$file->is_directory()) {
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return;
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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_filearea(), $file->get_itemid(),
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$file->get_filepath(), true, true);
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foreach ($files as $file) {
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$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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$file->archive_file($ziparch, $path);
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}
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}
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private function archive_pathname($ziparch, $archivepath, $file) {
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if (!file_exists($file)) {
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return;
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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;
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}
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$ziparch->add_file_from_pathname($archivepath, $file);
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return;
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}
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if (is_dir($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, $file->getPathname());
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}
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unset($files); //release file handles
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return;
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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 overwrited
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* @param mixed $archivefile full pathname of zip file or stored_file instance
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* @param string $pathname target directory
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* @return mixed list of processed files; false if error
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*/
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public function extract_to_pathname($archivefile, $pathname) {
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global $CFG;
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if (!is_string($archivefile)) {
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return $archivefile->extract_to_pathname($this, $pathname);
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}
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$processed = array();
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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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foreach ($ziparch as $info) {
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$size = $info->size;
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$name = $info->pathname;
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if ($name === '' or array_key_exists($name, $processed)) {
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//probably filename collisions caused by filename cleaning/conversion
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continue;
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}
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if ($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[$name] = 'Can not create directory, file already exists'; // TODO: localise
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continue;
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}
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if (is_dir($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[$name] = 'Can not create directory'; // TODO: localise
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}
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}
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continue;
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}
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$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[$name] = 'Can not create directory'; // TODO: localise
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continue;
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}
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}
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$newfile = "$newdir/$filename";
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if (!$fp = fopen($newfile, 'wb')) {
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$processed[$name] = 'Can not write target file'; // TODO: localise
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continue;
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}
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if (!$fz = $ziparch->get_stream($info->index)) {
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$processed[$name] = 'Can not read file from zip archive'; // TODO: localise
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fclose($fp);
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continue;
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}
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while (!feof($fz)) {
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$content = fread($fz, 262143);
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fwrite($fp, $content);
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}
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fclose($fz);
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fclose($fp);
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if (filesize($newfile) !== $size) {
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$processed[$name] = 'Unknown error during zip extraction'; // TODO: localise
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// something went wrong :-(
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@unlink($newfile);
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continue;
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}
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$processed[$name] = true;
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}
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$ziparch->close();
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return $processed;
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}
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/**
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* Unzip file to given file path (real OS filesystem), existing files are overwrited
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* @param mixed $archivefile full pathname of zip file or stored_file instance
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* @param int $contextid
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* @param string $filearea
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* @param int $itemid
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* @param string $filepath
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* @return mixed list of processed files; false if error
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*/
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public function extract_to_storage($archivefile, $contextid, $filearea, $itemid, $pathbase, $userid=null) {
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global $CFG;
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if (!is_string($archivefile)) {
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return $archivefile->extract_to_pathname($this, $contextid, $filearea, $itemid, $pathbase, $userid);
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}
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check_dir_exists($CFG->dataroot.'/temp/zip', true, true);
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$pathbase = trim($pathbase, '/');
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$pathbase = ($pathbase === '') ? '/' : '/'.$pathbase.'/';
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$fs = get_file_storage();
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$processed = array();
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$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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foreach ($ziparch as $info) {
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$size = $info->size;
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$name = $info->pathname;
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if ($name === '' or array_key_exists($name, $processed)) {
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//probably filename collisions caused by filename cleaning/conversion
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continue;
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}
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if ($info->is_directory) {
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$newfilepath = $pathbase.$name.'/';
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$fs->create_directory($contextid, $filearea, $itemid, $newfilepath, $userid);
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$processed[$name] = true;
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continue;
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}
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$parts = explode('/', trim($name, '/'));
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$filename = array_pop($parts);
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$filepath = $pathbase;
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if ($parts) {
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$filepath .= implode('/', $parts).'/';
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}
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if ($size < 2097151) {
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// small file
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if (!$fz = $ziparch->get_stream($info->index)) {
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$processed[$name] = 'Can not read file from zip archive'; // TODO: localise
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continue;
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}
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$content = '';
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while (!feof($fz)) {
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$content .= fread($fz, 262143);
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}
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fclose($fz);
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if (strlen($content) !== $size) {
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$processed[$name] = 'Unknown error during zip extraction'; // TODO: localise
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// something went wrong :-(
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unset($content);
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continue;
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}
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if ($file = $fs->get_file($contextid, $filearea, $itemid, $filepath, $filename)) {
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if (!$file->delete()) {
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$processed[$name] = 'Can not delete existing file'; // TODO: localise
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continue;
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}
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}
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$file_record = new object();
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$file_record->contextid = $contextid;
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$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 = $userid;
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if ($fs->create_file_from_string($file_record, $content)) {
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$processed[$name] = true;
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} else {
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$processed[$name] = 'Unknown error during zip extraction'; // TODO: localise
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}
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unset($content);
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continue;
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} else {
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// large file, would not fit into memory :-(
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$tmpfile = tempnam($CFG->dataroot.'/temp/zip', 'unzip');
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if (!$fp = fopen($tmpfile, 'wb')) {
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@unlink($tmpfile);
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$processed[$name] = 'Can not write temp file'; // TODO: localise
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continue;
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}
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if (!$fz = $ziparch->get_stream($info->index)) {
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@unlink($tmpfile);
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$processed[$name] = 'Can not read file from zip archive'; // TODO: localise
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continue;
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}
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while (!feof($fz)) {
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$content = fread($fz, 262143);
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fwrite($fp, $content);
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}
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fclose($fz);
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fclose($fp);
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if (filesize($tmpfile) !== $size) {
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$processed[$name] = 'Unknown error during zip extraction'; // TODO: localise
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// something went wrong :-(
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@unlink($tmpfile);
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continue;
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}
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if ($file = $fs->get_file($contextid, $filearea, $itemid, $filepath, $filename)) {
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if (!$file->delete()) {
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@unlink($tmpfile);
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$processed[$name] = 'Can not delete existing file'; // TODO: localise
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continue;
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}
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}
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$file_record = new object();
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$file_record->contextid = $contextid;
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$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 = $userid;
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if ($fs->create_file_from_pathname($file_record, $tmpfile)) {
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$processed[$name] = true;
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} else {
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$processed[$name] = 'Unknown error during zip extraction'; // TODO: localise
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}
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@unlink($tmpfile);
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continue;
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}
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}
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$ziparch->close();
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return $processed;
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}
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/**
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* Returns array of info about all files in archive
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* @return array of file infos
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*/
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public function list_files($archivefile) {
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if (!is_string($archivefile)) {
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return $archivefile->list_files();
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}
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$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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$list = $ziparch->list_files();
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$ziparch->close();
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return $list;
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}
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}
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