lib/filestorage/mbz_packer.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * Implementation of .mbz packer.
  19  *
  20  * This packer supports .mbz files which can be either .zip or .tar.gz format
  21  * internally. A suitable format is chosen depending on system option when
  22  * creating new files.
  23  *
  24  * Internally this packer works by wrapping the existing .zip/.tar.gz packers.
  25  *
  26  * Backup filenames do not contain non-ASCII characters so packers that do not
  27  * support UTF-8 (like the current .tar.gz packer, and possibly external zip
  28  * software in some cases if used) can be used by this packer.
  29  *
  30  * @package core_files
  31  * @copyright 2013 The Open University
  32  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  33  */
  34
  35 defined('MOODLE_INTERNAL') || die();
  36
  37 require_once("$CFG->libdir/filestorage/file_packer.php");
  38
  39 /**
  40  * Utility class - handles all packing/unpacking of .mbz files.
  41  *
  42  * @package core_files
  43  * @category files
  44  * @copyright 2013 The Open University
  45  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  46  */
  47 class mbz_packer extends file_packer {
  48     /**
  49      * Archive files and store the result in file storage.
  50      *
  51      * Any existing file at that location will be overwritten.
  52      *
  53      * @param array $files array from archive path => pathname or stored_file
  54      * @param int $contextid context ID
  55      * @param string $component component
  56      * @param string $filearea file area
  57      * @param int $itemid item ID
  58      * @param string $filepath file path
  59      * @param string $filename file name
  60      * @param int $userid user ID
  61      * @param bool $ignoreinvalidfiles true means ignore missing or invalid files, false means abort on any error
  62      * @param file_progress $progress Progress indicator callback or null if not required
  63      * @return stored_file|bool false if error stored_file instance if ok
  64      * @throws file_exception If file operations fail
  65      * @throws coding_exception If any archive paths do not meet the restrictions
  66      */
  67     public function archive_to_storage(array $files, $contextid,
  68             $component, $filearea, $itemid, $filepath, $filename,
  69             $userid = null, $ignoreinvalidfiles = true, file_progress $progress = null) {
  70         return $this->get_packer_for_archive_operation()->archive_to_storage($files,
  71                 $contextid, $component, $filearea, $itemid, $filepath, $filename,
  72                 $userid, $ignoreinvalidfiles, $progress);
  73     }
  74
  75     /**
  76      * Archive files and store the result in an OS file.
  77      *
  78      * @param array $files array from archive path => pathname or stored_file
  79      * @param string $archivefile path to target zip file
  80      * @param bool $ignoreinvalidfiles true means ignore missing or invalid files, false means abort on any error
  81      * @param file_progress $progress Progress indicator callback or null if not required
  82      * @return bool true if file created, false if not
  83      * @throws coding_exception If any archive paths do not meet the restrictions
  84      */
  85     public function archive_to_pathname(array $files, $archivefile,
  86             $ignoreinvalidfiles=true, file_progress $progress = null) {
  87         return $this->get_packer_for_archive_operation()->archive_to_pathname($files,
  88                 $archivefile, $ignoreinvalidfiles, $progress);
  89     }
  90
  91     /**
  92      * Extract file to given file path (real OS filesystem), existing files are overwritten.
  93      *
  94      * @param stored_file|string $archivefile full pathname of zip file or stored_file instance
  95      * @param string $pathname target directory
  96      * @param array $onlyfiles only extract files present in the array
  97      * @param file_progress $progress Progress indicator callback or null if not required
  98      * @return array list of processed files (name=>true)
  99      * @throws moodle_exception If error
 100      */
 101     public function extract_to_pathname($archivefile, $pathname,
 102             array $onlyfiles = null, file_progress $progress = null) {
 103         return $this->get_packer_for_read_operation($archivefile)->extract_to_pathname(
 104                 $archivefile, $pathname, $onlyfiles, $progress);
 105     }
 106
 107     /**
 108      * Extract file to given file path (real OS filesystem), existing files are overwritten.
 109      *
 110      * @param string|stored_file $archivefile full pathname of zip file or stored_file instance
 111      * @param int $contextid context ID
 112      * @param string $component component
 113      * @param string $filearea file area
 114      * @param int $itemid item ID
 115      * @param string $pathbase file path
 116      * @param int $userid user ID
 117      * @param file_progress $progress Progress indicator callback or null if not required
 118      * @return array list of processed files (name=>true)
 119      * @throws moodle_exception If error
 120      */
 121     public function extract_to_storage($archivefile, $contextid,
 122             $component, $filearea, $itemid, $pathbase, $userid = null,
 123             file_progress $progress = null) {
 124         return $this->get_packer_for_read_operation($archivefile)->extract_to_storage(
 125                 $archivefile, $contextid, $component, $filearea, $itemid, $pathbase,
 126                 $userid, $progress);
 127     }
 128
 129     /**
 130      * Returns array of info about all files in archive.
 131      *
 132      * @param string|stored_file $archivefile
 133      * @return array of file infos
 134      */
 135     public function list_files($archivefile) {
 136         return $this->get_packer_for_read_operation($archivefile)->list_files($archivefile);
 137     }
 138
 139     /**
 140      * Selects appropriate packer for new archive depending on system option
 141      * and whether required extension is available.
 142      *
 143      * @return file_packer Suitable packer
 144      */
 145     protected function get_packer_for_archive_operation() {
 146         global $CFG;
 147         require_once($CFG->dirroot . '/lib/filestorage/tgz_packer.php');
 148
 149         if (!empty($CFG->usezipbackups)) {
 150             // Allow forced use of zip backups.
 151             return get_file_packer('application/zip');
 152         } else {
 153             return get_file_packer('application/x-gzip');
 154         }
 155     }
 156
 157     /**
 158      * Selects appropriate packer for existing archive depending on file contents.
 159      *
 160      * @param string|stored_file $archivefile full pathname of zip file or stored_file instance
 161      * @return file_packer Suitable packer
 162      */
 163     protected function get_packer_for_read_operation($archivefile) {
 164         global $CFG;
 165         require_once($CFG->dirroot . '/lib/filestorage/tgz_packer.php');
 166
 167         if (tgz_packer::is_tgz_file($archivefile)) {
 168             return get_file_packer('application/x-gzip');
 169         } else {
 170             return get_file_packer('application/zip');
 171         }
 172     }
 173 }