1<?php
2
3// This file is part of Moodle - http://moodle.org/
4//
5// Moodle is free software: you can redistribute it and/or modify
6// it under the terms of the GNU General Public License as published by
7// the Free Software Foundation, either version 3 of the License, or
8// (at your option) any later version.
9//
10// Moodle is distributed in the hope that it will be useful,
11// but WITHOUT ANY WARRANTY; without even the implied warranty of
12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13// GNU General Public License for more details.
14//
15// You should have received a copy of the GNU General Public License
16// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
17
18/**
19 * Defines backup_resource_activity_task class
20 *
21 * @package     mod_resource
22 * @category    backup
23 * @copyright   2010 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
24 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
25 */
26
27defined('MOODLE_INTERNAL') || die;
28
29require_once($CFG->dirroot . '/mod/resource/backup/moodle2/backup_resource_stepslib.php');
30
31/**
32 * Provides the steps to perform one complete backup of the Resource instance
33 */
34class backup_resource_activity_task extends backup_activity_task {
35
36    /**
37     * @param bool $resourceoldexists True if there are records in the resource_old table.
38     */
39    protected static $resourceoldexists = null;
40
41    /**
42     * No specific settings for this activity
43     */
44    protected function define_my_settings() {
45    }
46
47    /**
48     * Defines a backup step to store the instance data in the resource.xml file
49     */
50    protected function define_my_steps() {
51        $this->add_step(new backup_resource_activity_structure_step('resource_structure', 'resource.xml'));
52    }
53
54    /**
55     * Encodes URLs to the index.php and view.php scripts
56     *
57     * @param string $content some HTML text that eventually contains URLs to the activity instance scripts
58     * @return string the content with the URLs encoded
59     */
60    static public function encode_content_links($content) {
61        global $CFG, $DB;
62
63        $base = preg_quote($CFG->wwwroot,"/");
64
65        // Link to the list of resources.
66        $search="/(".$base."\/mod\/resource\/index.php\?id\=)([0-9]+)/";
67        $content= preg_replace($search, '$@RESOURCEINDEX*$2@$', $content);
68
69        // Link to resource view by moduleid.
70        $search = "/(".$base."\/mod\/resource\/view.php\?id\=)([0-9]+)/";
71        // Link to resource view by recordid
72        $search2 = "/(".$base."\/mod\/resource\/view.php\?r\=)([0-9]+)/";
73
74        // Check whether there are contents in the resource old table.
75        if (static::$resourceoldexists === null) {
76            static::$resourceoldexists = $DB->record_exists('resource_old', array());
77        }
78
79        // If there are links to items in the resource_old table, rewrite them to be links to the correct URL
80        // for their new module.
81        if (static::$resourceoldexists) {
82            // Match all of the resources.
83            $result = preg_match_all($search, $content, $matches, PREG_PATTERN_ORDER);
84
85            // Course module ID resource links.
86            if ($result) {
87                list($insql, $params) = $DB->get_in_or_equal($matches[2]);
88                $oldrecs = $DB->get_records_select('resource_old', "cmid $insql", $params, '', 'cmid, newmodule');
89
90                for ($i = 0; $i < count($matches[0]); $i++) {
91                    $cmid = $matches[2][$i];
92                    if (isset($oldrecs[$cmid])) {
93                        // Resource_old item, rewrite it
94                        $replace = '$@' . strtoupper($oldrecs[$cmid]->newmodule) . 'VIEWBYID*' . $cmid . '@$';
95                    } else {
96                        // Not in the resource old table, don't rewrite
97                        $replace = '$@RESOURCEVIEWBYID*'.$cmid.'@$';
98                    }
99                    $content = str_replace($matches[0][$i], $replace, $content);
100                }
101            }
102
103            $matches = null;
104            $result = preg_match_all($search2, $content, $matches, PREG_PATTERN_ORDER);
105
106            // No resource links.
107            if (!$result) {
108                return $content;
109            }
110            // Resource ID links.
111            list($insql, $params) = $DB->get_in_or_equal($matches[2]);
112            $oldrecs = $DB->get_records_select('resource_old', "oldid $insql", $params, '', 'oldid, cmid, newmodule');
113
114            for ($i = 0; $i < count($matches[0]); $i++) {
115                $recordid = $matches[2][$i];
116                if (isset($oldrecs[$recordid])) {
117                    // Resource_old item, rewrite it
118                    $replace = '$@' . strtoupper($oldrecs[$recordid]->newmodule) . 'VIEWBYID*' . $oldrecs[$recordid]->cmid . '@$';
119                    $content = str_replace($matches[0][$i], $replace, $content);
120                }
121            }
122        } else {
123            $content = preg_replace($search, '$@RESOURCEVIEWBYID*$2@$', $content);
124        }
125        return $content;
126    }
127}
128