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     return $output;
  51 }
  52
  53 /**
  54  * returns array of plagiarism details about specified file
  55  *
  56  * @param int $cmid
  57  * @param int $userid
  58  * @param object $file moodle file object
  59  * @return array - sets of details about specified file, one array of details per plagiarism plugin
  60  *  - each set contains at least 'analyzed', 'score', 'reporturl'
  61  */
  62 function plagiarism_get_file_results($cmid, $userid, $file) {
  63     global $CFG;
  64     $allresults = array();
  65     if (empty($CFG->enableplagiarism)) {
  66         return $allresults;
  67     }
  68     $plagiarismplugins = plagiarism_load_available_plugins();
  69     foreach ($plagiarismplugins as $plugin => $dir) {
  70         require_once($dir.'/lib.php');
  71         $plagiarismclass = "plagiarism_plugin_$plugin";
  72         $plagiarismplugin = new $plagiarismclass;
  73         $allresults[] = $plagiarismplugin->get_file_results($cmid, $userid, $file);
  74     }
  75     return $allresults;
  76 }
  77
  78 /**
  79  * saves/updates plagiarism settings from a modules config page - called by course/modedit.php
  80  *
  81  * @deprecated Since Moodle 3.9. MDL-65835 Please use {plugin name}_coursemodule_edit_post_actions() instead.
  82  * @todo MDL-67526 This is to be moved from here to deprecatedlib.php in Moodle 4.1
  83  * @param object $data - form data
  84  */
  85 function plagiarism_save_form_elements($data) {
  86     global $CFG;
  87     if (empty($CFG->enableplagiarism)) {
  88         return '';
  89     }
  90     $plagiarismplugins = plagiarism_load_available_plugins();
  91     foreach ($plagiarismplugins as $plugin => $dir) {
  92         require_once($dir.'/lib.php');
  93         $plagiarismclass = "plagiarism_plugin_$plugin";
  94         $plagiarismplugin = new $plagiarismclass;
  95
  96         $reflectionmethod = new ReflectionMethod($plagiarismplugin, 'save_form_elements');
  97         if ($reflectionmethod->getDeclaringClass()->getName() == get_class($plagiarismplugin)) {
  98             $text = 'plagiarism_plugin::save_form_elements() is deprecated.';
  99             $text .= ' Use plagiarism_' . $plugin . '_coursemodule_edit_post_actions() instead';
 100             debugging($text, DEBUG_DEVELOPER);
 101         }
 102
 103         $plagiarismplugin->save_form_elements($data);
 104     }
 105 }
 106
 107 /**
 108  * adds the list of plagiarism settings to a form - called inside modules that have enabled plagiarism
 109  *
 110  * @deprecated Since Moodle 3.9. MDL-65835 Please use {plugin name}_coursemodule_standard_elements() instead.
 111  * @todo MDL-67526 This is to be moved from here to deprecatedlib.php in Moodle 4.1
 112  * @param object $mform - Moodle form object
 113  * @param object $context - context object
 114  * @param string $modulename - Name of the module
 115  */
 116 function plagiarism_get_form_elements_module($mform, $context, $modulename = "") {
 117     global $CFG;
 118     if (empty($CFG->enableplagiarism)) {
 119         return '';
 120     }
 121     $plagiarismplugins = plagiarism_load_available_plugins();
 122     foreach ($plagiarismplugins as $plugin => $dir) {
 123         require_once($dir.'/lib.php');
 124         $plagiarismclass = "plagiarism_plugin_$plugin";
 125         $plagiarismplugin = new $plagiarismclass;
 126
 127         $reflectionmethod = new ReflectionMethod($plagiarismplugin, 'get_form_elements_module');
 128         if ($reflectionmethod->getDeclaringClass()->getName() == get_class($plagiarismplugin)) {
 129             $text = 'plagiarism_plugin::get_form_elements_module() is deprecated.';
 130             $text .= ' Use plagiarism_' . $plugin . '_coursemodule_standard_elements() instead';
 131             debugging($text, DEBUG_DEVELOPER);
 132         }
 133
 134         $plagiarismplugin->get_form_elements_module($mform, $context, $modulename);
 135     }
 136 }
 137 /**
 138  * updates the status of all files within a module
 139  *
 140  * @param object $course - full Course object
 141  * @param object $cm - full cm object
 142  * @return string
 143  */
 144 function plagiarism_update_status($course, $cm) {
 145     global $CFG;
 146     if (empty($CFG->enableplagiarism)) {
 147         return '';
 148     }
 149     $plagiarismplugins = plagiarism_load_available_plugins();
 150     $output = '';
 151     foreach ($plagiarismplugins as $plugin => $dir) {
 152         require_once($dir.'/lib.php');
 153         $plagiarismclass = "plagiarism_plugin_$plugin";
 154         $plagiarismplugin = new $plagiarismclass;
 155         $output .= $plagiarismplugin->update_status($course, $cm);
 156     }
 157     return $output;
 158 }
 159
 160 /**
 161  * Function that prints the student disclosure notifying that the files will be checked for plagiarism
 162  * @param integer $cmid - the cmid of this module
 163  * @return string
 164  */
 165 function plagiarism_print_disclosure($cmid) {
 166     global $CFG;
 167     if (empty($CFG->enableplagiarism)) {
 168         return '';
 169     }
 170     $plagiarismplugins = plagiarism_load_available_plugins();
 171     $output = '';
 172     foreach ($plagiarismplugins as $plugin => $dir) {
 173         require_once($dir.'/lib.php');
 174         $plagiarismclass = "plagiarism_plugin_$plugin";
 175         $plagiarismplugin = new $plagiarismclass;
 176         $output .= $plagiarismplugin->print_disclosure($cmid);
 177     }
 178     return $output;
 179 }
 180
 181 /**
 182  * Helper function - also loads lib file of plagiarism plugin
 183  *
 184  * @todo MDL-67872 the deprecated code in this function to be removed in Moodle 4.1
 185  * @return array of available plugins
 186  */
 187 function plagiarism_load_available_plugins() {
 188     global $CFG;
 189     static $showndeprecatedmessage = array(); // Only show message once per page load.
 190
 191     if (empty($CFG->enableplagiarism)) {
 192         return array();
 193     }
 194     $plagiarismplugins = core_component::get_plugin_list('plagiarism');
 195     $availableplugins = array();
 196     foreach ($plagiarismplugins as $plugin => $dir) {
 197         // Check this plugin is enabled and a lib file exists.
 198         if (get_config('plagiarism', $plugin."_use")) {
 199             // Deprecated Since Moodle 3.9.
 200             $pluginenabled = true;
 201             if (empty($showndeprecatedmessage[$plugin])) {
 202                 $text = 'The setting plagiarism:'.$plugin.'_use is deprecated.';
 203                 $text .= ' Use plagiarism_' . $plugin . ':enabled instead';
 204                 debugging($text, DEBUG_DEVELOPER);
 205                 $showndeprecatedmessage[$plugin] = true;
 206             }
 207         } else {
 208             $pluginenabled = get_config('plagiarism_'.$plugin, 'enabled');
 209         }
 210         if ($pluginenabled && file_exists($dir."/lib.php")) {
 211             require_once($dir.'/lib.php');
 212             $plagiarismclass = "plagiarism_plugin_$plugin";
 213             if (class_exists($plagiarismclass)) {
 214                 $availableplugins[$plugin] = $dir;
 215             }
 216         }
 217     }
 218     return $availableplugins;
 219 }