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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Implementation of .mbz packer.
*
* This packer supports .mbz files which can be either .zip or .tar.gz format
* internally. A suitable format is chosen depending on system option when
* creating new files.
*
* Internally this packer works by wrapping the existing .zip/.tar.gz packers.
*
* Backup filenames do not contain non-ASCII characters so packers that do not
* support UTF-8 (like the current .tar.gz packer, and possibly external zip
* software in some cases if used) can be used by this packer.
*
* @package core_files
* @copyright 2013 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once("$CFG->libdir/filestorage/file_packer.php");
/**
* Utility class - handles all packing/unpacking of .mbz files.
*
* @package core_files
* @category files
* @copyright 2013 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class mbz_packer extends file_packer {
/**
* Archive files and store the result in file storage.
*
* Any existing file at that location will be overwritten.
*
* @param array $files array from archive path => pathname or stored_file
* @param int $contextid context ID
* @param string $component component
* @param string $filearea file area
* @param int $itemid item ID
* @param string $filepath file path
* @param string $filename file name
* @param int $userid user ID
* @param bool $ignoreinvalidfiles true means ignore missing or invalid files, false means abort on any error
* @param file_progress $progress Progress indicator callback or null if not required
* @return stored_file|bool false if error stored_file instance if ok
* @throws file_exception If file operations fail
* @throws coding_exception If any archive paths do not meet the restrictions
*/
public function archive_to_storage(array $files, $contextid,
$component, $filearea, $itemid, $filepath, $filename,
$userid = null, $ignoreinvalidfiles = true, file_progress $progress = null) {
return $this->get_packer_for_archive_operation()->archive_to_storage($files,
$contextid, $component, $filearea, $itemid, $filepath, $filename,
$userid, $ignoreinvalidfiles, $progress);
}
/**
* Archive files and store the result in an OS file.
*
* @param array $files array from archive path => pathname or stored_file
* @param string $archivefile path to target zip file
* @param bool $ignoreinvalidfiles true means ignore missing or invalid files, false means abort on any error
* @param file_progress $progress Progress indicator callback or null if not required
* @return bool true if file created, false if not
* @throws coding_exception If any archive paths do not meet the restrictions
*/
public function archive_to_pathname(array $files, $archivefile,
$ignoreinvalidfiles=true, file_progress $progress = null) {
return $this->get_packer_for_archive_operation()->archive_to_pathname($files,
$archivefile, $ignoreinvalidfiles, $progress);
}
/**
* Extract file to given file path (real OS filesystem), existing files are overwritten.
*
* @param stored_file|string $archivefile full pathname of zip file or stored_file instance
* @param string $pathname target directory
* @param array $onlyfiles only extract files present in the array
* @param file_progress $progress Progress indicator callback or null if not required
* @param bool $returnbool Whether to return a basic true/false indicating error state, or full per-file error
* details.
* @return array list of processed files (name=>true)
* @throws moodle_exception If error
*/
public function extract_to_pathname($archivefile, $pathname,
array $onlyfiles = null, file_progress $progress = null, $returnbool = false) {
return $this->get_packer_for_read_operation($archivefile)->extract_to_pathname(
$archivefile, $pathname, $onlyfiles, $progress, $returnbool);
}
/**
* Extract file to given file path (real OS filesystem), existing files are overwritten.
*
* @param string|stored_file $archivefile full pathname of zip file or stored_file instance
* @param int $contextid context ID
* @param string $component component
* @param string $filearea file area
* @param int $itemid item ID
* @param string $pathbase file path
* @param int $userid user ID
* @param file_progress $progress Progress indicator callback or null if not required
* @return array list of processed files (name=>true)
* @throws moodle_exception If error
*/
public function extract_to_storage($archivefile, $contextid,
$component, $filearea, $itemid, $pathbase, $userid = null,
file_progress $progress = null) {
return $this->get_packer_for_read_operation($archivefile)->extract_to_storage(
$archivefile, $contextid, $component, $filearea, $itemid, $pathbase,
$userid, $progress);
}
/**
* Returns array of info about all files in archive.
*
* @param string|stored_file $archivefile
* @return array of file infos
*/
public function list_files($archivefile) {
return $this->get_packer_for_read_operation($archivefile)->list_files($archivefile);
}
/**
* Selects appropriate packer for new archive depending on system option
* and whether required extension is available.
*
* @return file_packer Suitable packer
*/
protected function get_packer_for_archive_operation() {
global $CFG;
require_once($CFG->dirroot . '/lib/filestorage/tgz_packer.php');
if (!empty($CFG->usezipbackups)) {
// Allow forced use of zip backups.
return get_file_packer('application/zip');
} else {
return get_file_packer('application/x-gzip');
}
}
/**
* Selects appropriate packer for existing archive depending on file contents.
*
* @param string|stored_file $archivefile full pathname of zip file or stored_file instance
* @return file_packer Suitable packer
*/
protected function get_packer_for_read_operation($archivefile) {
global $CFG;
require_once($CFG->dirroot . '/lib/filestorage/tgz_packer.php');
if (tgz_packer::is_tgz_file($archivefile)) {
return get_file_packer('application/x-gzip');
} else {
return get_file_packer('application/zip');
}
}
}