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 * @package   moodlecore
18 * @subpackage backup-imscc
19 * @copyright 2009 Mauro Rondinelli (mauro.rondinelli [AT] uvcms.com)
20 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
21 */
22defined('MOODLE_INTERNAL') or die('Direct access to this script is forbidden.');
23
24require_once($CFG->dirroot . '/backup/cc/includes/constants.php');
25require_once($CFG->dirroot . '/backup/cc/cc2moodle.php');
26
27function cc_convert ($dir) {
28    global $OUTPUT;
29
30    $manifest_file = $dir . DIRECTORY_SEPARATOR . 'imsmanifest.xml';
31    $moodle_file = $dir . DIRECTORY_SEPARATOR . 'moodle.xml';
32    $schema_file = 'cc' . DIRECTORY_SEPARATOR . '' . DIRECTORY_SEPARATOR . 'schemas' . DIRECTORY_SEPARATOR . 'cclibxml2validator.xsd';
33
34    if (is_readable($manifest_file) && !is_readable($moodle_file)) {
35
36        $is_cc = detect_cc_format($manifest_file);
37
38        if ($is_cc) {
39
40            $detected_requirements = detect_requirements();
41
42            if (!$detected_requirements["php5"]) {
43                echo $OUTPUT->notification(get_string('cc_import_req_php5', 'imscc'));
44                return false;
45            }
46
47            if (!$detected_requirements["dom"]) {
48                echo $OUTPUT->notification(get_string('cc_import_req_dom', 'imscc'));
49                return false;
50            }
51
52            if (!$detected_requirements["libxml"]) {
53                echo $OUTPUT->notification(get_string('cc_import_req_libxml', 'imscc'));
54                return false;
55            }
56
57            if (!$detected_requirements["libxmlminversion"]) {
58                echo $OUTPUT->notification(get_string('cc_import_req_libxmlminversion', 'imscc'));
59                return false;
60            }
61            if (!$detected_requirements["xsl"]) {
62                echo $OUTPUT->notification(get_string('cc_import_req_xsl', 'imscc'));
63                return false;
64            }
65
66            echo get_string('cc2moodle_checking_schema', 'imscc') . '<br />';
67
68            $cc_manifest = new DOMDocument();
69
70            if ($cc_manifest->load($manifest_file)) {
71                if ($cc_manifest->schemaValidate($schema_file)) {
72
73                    echo get_string('cc2moodle_valid_schema', 'imscc') . '<br />';
74
75                    $cc2moodle = new cc2moodle($manifest_file);
76
77                    if (!$cc2moodle->is_auth()) {
78                        return $cc2moodle->generate_moodle_xml();
79                    } else {
80                        echo $OUTPUT->notification(get_string('cc2moodle_req_auth', 'imscc'));
81                        return false;
82                    }
83
84                } else {
85                    echo $OUTPUT->notification(get_string('cc2moodle_invalid_schema', 'imscc'));
86                    return false;
87                }
88
89            } else {
90                echo $OUTPUT->notification(get_string('cc2moodle_manifest_dont_load', 'imscc'));
91                return false;
92            }
93        }
94    }
95
96    return true;
97}
98
99function detect_requirements () {
100
101    if (floor(phpversion()) >= 5) {
102        $detected["php5"] = true;
103    } else {
104        $detected["php5"] = false;
105    }
106
107    $detected["xsl"] = extension_loaded('xsl');
108    $detected['dom'] = extension_loaded('dom');
109    $detected['libxml'] = extension_loaded('libxml');
110    $detected['libxmlminversion'] = extension_loaded('libxml') && version_compare(LIBXML_DOTTED_VERSION, '2.6.30', '>=');
111
112    return $detected;
113
114}
115
116function detect_cc_format ($xml_file) {
117
118    $inpos = 0;
119    $xml_snippet = file_get_contents($xml_file, 0, NULL, 0, 500);
120
121    if (!empty($xml_snippet)) {
122
123        $xml_snippet = strtolower($xml_snippet);
124        $xml_snippet = preg_replace('/\s*/m', '', $xml_snippet);
125        $xml_snippet = str_replace("'", '', $xml_snippet);
126        $xml_snippet = str_replace('"', '', $xml_snippet);
127
128        $search_string = "xmlns=" . NS_COMMON_CARTRIDGE;
129
130        $inpos = strpos($xml_snippet, $search_string);
131
132        if ($inpos) {
133            return true;
134        } else {
135            return false;
136        }
137
138    } else {
139        return false;
140    }
141
142}
143