lib/plagiarismlib.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  * plagiarismlib.php - Contains core Plagiarism related functions.
  19  *
  20  * @since Moodle 2.0
  21  * @package    core
  22  * @subpackage plagiarism
  23  * @copyright  2010 Dan Marsden http://danmarsden.com
  24  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27 if (!defined('MOODLE_INTERNAL')) {
  28     die('Direct access to this script is forbidden.');
  29 }
  30
  31 /**
  32  * displays the similarity score and provides a link to the full report if allowed.
  33  *
  34  * @param object  $linkarray contains all relevant information for the plugin to generate a link
  35  * @return string - url to allow login/viewing of a similarity report
  36  */
  37 function plagiarism_get_links($linkarray) {
  38     global $CFG;
  39     if (empty($CFG->enableplagiarism)) {
  40         return '';
  41     }
  42     $plagiarismplugins = plagiarism_load_available_plugins();
  43     $output = '';
  44     foreach ($plagiarismplugins as $plugin => $dir) {
  45         require_once($dir.'/lib.php');
  46         $plagiarismclass = "plagiarism_plugin_$plugin";
  47         $plagiarismplugin = new $plagiarismclass;
  48         $output .= $plagiarismplugin->get_links($linkarray);
  49     }
  50     if (!empty($output)) {
  51         return html_writer::span($output, 'core_plagiarism_links');
  52     }
  53     return '';
  54 }
  55
  56 /**
  57  * returns array of plagiarism details about specified file
  58  *
  59  * @param int $cmid
  60  * @param int $userid
  61  * @param object $file moodle file object
  62  * @return array - sets of details about specified file, one array of details per plagiarism plugin
  63  *  - each set contains at least 'analyzed', 'score', 'reporturl'
  64  */
  65 function plagiarism_get_file_results($cmid, $userid, $file) {
  66     global $CFG;
  67     $allresults = array();
  68     if (empty($CFG->enableplagiarism)) {
  69         return $allresults;
  70     }
  71     $plagiarismplugins = plagiarism_load_available_plugins();
  72     foreach ($plagiarismplugins as $plugin => $dir) {
  73         require_once($dir.'/lib.php');
  74         $plagiarismclass = "plagiarism_plugin_$plugin";
  75         $plagiarismplugin = new $plagiarismclass;
  76         $allresults[] = $plagiarismplugin->get_file_results($cmid, $userid, $file);
  77     }
  78     return $allresults;
  79 }
  80
  81 /**
  82  * saves/updates plagiarism settings from a modules config page - called by course/modedit.php
  83  *
  84  * @deprecated Since Moodle 3.9. MDL-65835 Please use {plugin name}_coursemodule_edit_post_actions() instead.
  85  * @todo MDL-67526 This is to be moved from here to deprecatedlib.php in Moodle 4.1
  86  * @param object $data - form data
  87  */
  88 function plagiarism_save_form_elements($data) {
  89     global $CFG;
  90     if (empty($CFG->enableplagiarism)) {
  91         return '';
  92     }
  93     $plagiarismplugins = plagiarism_load_available_plugins();
  94     foreach ($plagiarismplugins as $plugin => $dir) {
  95         require_once($dir.'/lib.php');
  96         $plagiarismclass = "plagiarism_plugin_$plugin";
  97         $plagiarismplugin = new $plagiarismclass;
  98
  99         $reflectionmethod = new ReflectionMethod($plagiarismplugin, 'save_form_elements');
 100         if ($reflectionmethod->getDeclaringClass()->getName() == get_class($plagiarismplugin)) {
 101             $text = 'plagiarism_plugin::save_form_elements() is deprecated.';
 102             $text .= ' Use plagiarism_' . $plugin . '_coursemodule_edit_post_actions() instead';
 103             debugging($text, DEBUG_DEVELOPER);
 104         }
 105
 106         $plagiarismplugin->save_form_elements($data);
 107     }
 108 }
 109
 110 /**
 111  * adds the list of plagiarism settings to a form - called inside modules that have enabled plagiarism
 112  *
 113  * @deprecated Since Moodle 3.9. MDL-65835 Please use {plugin name}_coursemodule_standard_elements() instead.
 114  * @todo MDL-67526 This is to be moved from here to deprecatedlib.php in Moodle 4.1
 115  * @param object $mform - Moodle form object
 116  * @param object $context - context object
 117  * @param string $modulename - Name of the module
 118  */
 119 function plagiarism_get_form_elements_module($mform, $context, $modulename = "") {
 120     global $CFG;
 121     if (empty($CFG->enableplagiarism)) {
 122         return '';
 123     }
 124     $plagiarismplugins = plagiarism_load_available_plugins();
 125     foreach ($plagiarismplugins as $plugin => $dir) {
 126         require_once($dir.'/lib.php');
 127         $plagiarismclass = "plagiarism_plugin_$plugin";
 128         $plagiarismplugin = new $plagiarismclass;
 129
 130         $reflectionmethod = new ReflectionMethod($plagiarismplugin, 'get_form_elements_module');
 131         if ($reflectionmethod->getDeclaringClass()->getName() == get_class($plagiarismplugin)) {
 132             $text = 'plagiarism_plugin::get_form_elements_module() is deprecated.';
 133             $text .= ' Use plagiarism_' . $plugin . '_coursemodule_standard_elements() instead';
 134             debugging($text, DEBUG_DEVELOPER);
 135         }
 136
 137         $plagiarismplugin->get_form_elements_module($mform, $context, $modulename);
 138     }
 139 }
 140 /**
 141  * Allows a plagiarism plugin to print a button/link at the top of activity overview report pages.
 142  *
 143  * @param object $course - full Course object
 144  * @param object $cm - full cm object
 145  * @return string
 146  */
 147 function plagiarism_update_status($course, $cm) {
 148     global $CFG;
 149     if (empty($CFG->enableplagiarism)) {
 150         return '';
 151     }
 152     $plagiarismplugins = plagiarism_load_available_plugins();
 153     $output = '';
 154     foreach ($plagiarismplugins as $plugin => $dir) {
 155         require_once($dir.'/lib.php');
 156         $plagiarismclass = "plagiarism_plugin_$plugin";
 157         $plagiarismplugin = new $plagiarismclass;
 158         $output .= $plagiarismplugin->update_status($course, $cm);
 159     }
 160     return $output;
 161 }
 162
 163 /**
 164  * Function that prints the student disclosure notifying that the files will be checked for plagiarism
 165  * @param integer $cmid - the cmid of this module
 166  * @return string
 167  */
 168 function plagiarism_print_disclosure($cmid) {
 169     global $CFG;
 170     if (empty($CFG->enableplagiarism)) {
 171         return '';
 172     }
 173     $plagiarismplugins = plagiarism_load_available_plugins();
 174     $output = '';
 175     foreach ($plagiarismplugins as $plugin => $dir) {
 176         require_once($dir.'/lib.php');
 177         $plagiarismclass = "plagiarism_plugin_$plugin";
 178         $plagiarismplugin = new $plagiarismclass;
 179         $output .= $plagiarismplugin->print_disclosure($cmid);
 180     }
 181     return $output;
 182 }
 183
 184 /**
 185  * Helper function - also loads lib file of plagiarism plugin
 186  *
 187  * @todo MDL-67872 the deprecated code in this function to be removed in Moodle 4.1
 188  * @return array of available plugins
 189  */
 190 function plagiarism_load_available_plugins() {
 191     global $CFG;
 192     static $showndeprecatedmessage = array(); // Only show message once per page load.
 193
 194     if (empty($CFG->enableplagiarism)) {
 195         return array();
 196     }
 197     $plagiarismplugins = core_component::get_plugin_list('plagiarism');
 198     $availableplugins = array();
 199     foreach ($plagiarismplugins as $plugin => $dir) {
 200         // Check this plugin is enabled and a lib file exists.
 201         if (get_config('plagiarism', $plugin."_use")) {
 202             // Deprecated Since Moodle 3.9.
 203             $pluginenabled = true;
 204             if (empty($showndeprecatedmessage[$plugin])) {
 205                 $text = 'The setting plagiarism:'.$plugin.'_use is deprecated.';
 206                 $text .= ' Use plagiarism_' . $plugin . ':enabled instead';
 207                 debugging($text, DEBUG_DEVELOPER);
 208                 $showndeprecatedmessage[$plugin] = true;
 209             }
 210         } else {
 211             $pluginenabled = get_config('plagiarism_'.$plugin, 'enabled');
 212         }
 213         if ($pluginenabled && file_exists($dir."/lib.php")) {
 214             require_once($dir.'/lib.php');
 215             $plagiarismclass = "plagiarism_plugin_$plugin";
 216             if (class_exists($plagiarismclass)) {
 217                 $availableplugins[$plugin] = $dir;
 218             }
 219         }
 220     }
 221     return $availableplugins;
 222 }