course/modlib.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  * Library of functions specific to course/modedit.php and course API functions.
  19  * The course API function calling them are course/lib.php:create_module() and update_module().
  20  * This file has been created has an alternative solution to a full refactor of course/modedit.php
  21  * in order to create the course API functions.
  22  *
  23  * @copyright 2013 Jerome Mouneyrac
  24  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  * @package core_course
  26  */
  27
  28 defined('MOODLE_INTERNAL') || die;
  29
  30 require_once($CFG->dirroot.'/course/lib.php');
  31
  32 /**
  33  * Add course module.
  34  *
  35  * The function does not check user capabilities.
  36  * The function creates course module, module instance, add the module to the correct section.
  37  * It also trigger common action that need to be done after adding/updating a module.
  38  *
  39  * @param object $moduleinfo the moudle data
  40  * @param object $course the course of the module
  41  * @param object $mform this is required by an existing hack to deal with files during MODULENAME_add_instance()
  42  * @return object the updated module info
  43  */
  44 function add_moduleinfo($moduleinfo, $course, $mform = null) {
  45     global $DB, $CFG;
  46
  47     // Attempt to include module library before we make any changes to DB.
  48     include_modulelib($moduleinfo->modulename);
  49
  50     $moduleinfo->course = $course->id;
  51     $moduleinfo = set_moduleinfo_defaults($moduleinfo);
  52
  53     if (!empty($course->groupmodeforce) or !isset($moduleinfo->groupmode)) {
  54         $moduleinfo->groupmode = 0; // Do not set groupmode.
  55     }
  56
  57     // First add course_module record because we need the context.
  58     $newcm = new stdClass();
  59     $newcm->course           = $course->id;
  60     $newcm->module           = $moduleinfo->module;
  61     $newcm->instance         = 0; // Not known yet, will be updated later (this is similar to restore code).
  62     $newcm->visible          = $moduleinfo->visible;
  63     $newcm->visibleold       = $moduleinfo->visible;
  64     if (isset($moduleinfo->cmidnumber)) {
  65         $newcm->idnumber         = $moduleinfo->cmidnumber;
  66     }
  67     $newcm->groupmode        = $moduleinfo->groupmode;
  68     $newcm->groupingid       = $moduleinfo->groupingid;
  69     $newcm->groupmembersonly = $moduleinfo->groupmembersonly;
  70     $completion = new completion_info($course);
  71     if ($completion->is_enabled()) {
  72         $newcm->completion                = $moduleinfo->completion;
  73         $newcm->completiongradeitemnumber = $moduleinfo->completiongradeitemnumber;
  74         $newcm->completionview            = $moduleinfo->completionview;
  75         $newcm->completionexpected        = $moduleinfo->completionexpected;
  76     }
  77     if(!empty($CFG->enableavailability)) {
  78         // This code is used both when submitting the form, which uses a long
  79         // name to avoid clashes, and by unit test code which uses the real
  80         // name in the table.
  81         $newcm->availability = null;
  82         if (property_exists($moduleinfo, 'availabilityconditionsjson')) {
  83             if ($moduleinfo->availabilityconditionsjson !== '') {
  84                 $newcm->availability = $moduleinfo->availabilityconditionsjson;
  85             }
  86         } else if (property_exists($moduleinfo, 'availability')) {
  87             $newcm->availability = $moduleinfo->availability;
  88         }
  89     }
  90     if (isset($moduleinfo->showdescription)) {
  91         $newcm->showdescription = $moduleinfo->showdescription;
  92     } else {
  93         $newcm->showdescription = 0;
  94     }
  95
  96     // From this point we make database changes, so start transaction.
  97     $transaction = $DB->start_delegated_transaction();
  98
  99     if (!$moduleinfo->coursemodule = add_course_module($newcm)) {
 100         print_error('cannotaddcoursemodule');
 101     }
 102
 103     if (plugin_supports('mod', $moduleinfo->modulename, FEATURE_MOD_INTRO, true) &&
 104             isset($moduleinfo->introeditor)) {
 105         $introeditor = $moduleinfo->introeditor;
 106         unset($moduleinfo->introeditor);
 107         $moduleinfo->intro       = $introeditor['text'];
 108         $moduleinfo->introformat = $introeditor['format'];
 109     }
 110
 111     $addinstancefunction    = $moduleinfo->modulename."_add_instance";
 112     try {
 113         $returnfromfunc = $addinstancefunction($moduleinfo, $mform);
 114     } catch (moodle_exception $e) {
 115         $returnfromfunc = $e;
 116     }
 117     if (!$returnfromfunc or !is_number($returnfromfunc)) {
 118         // Undo everything we can. This is not necessary for databases which
 119         // support transactions, but improves consistency for other databases.
 120         $modcontext = context_module::instance($moduleinfo->coursemodule);
 121         context_helper::delete_instance(CONTEXT_MODULE, $moduleinfo->coursemodule);
 122         $DB->delete_records('course_modules', array('id'=>$moduleinfo->coursemodule));
 123
 124         if ($e instanceof moodle_exception) {
 125             throw $e;
 126         } else if (!is_number($returnfromfunc)) {
 127             print_error('invalidfunction', '', course_get_url($course, $moduleinfo->section));
 128         } else {
 129             print_error('cannotaddnewmodule', '', course_get_url($course, $moduleinfo->section), $moduleinfo->modulename);
 130         }
 131     }
 132
 133     $moduleinfo->instance = $returnfromfunc;
 134
 135     $DB->set_field('course_modules', 'instance', $returnfromfunc, array('id'=>$moduleinfo->coursemodule));
 136
 137     // Update embedded links and save files.
 138     $modcontext = context_module::instance($moduleinfo->coursemodule);
 139     if (!empty($introeditor)) {
 140         $moduleinfo->intro = file_save_draft_area_files($introeditor['itemid'], $modcontext->id,
 141                                                       'mod_'.$moduleinfo->modulename, 'intro', 0,
 142                                                       array('subdirs'=>true), $introeditor['text']);
 143         $DB->set_field($moduleinfo->modulename, 'intro', $moduleinfo->intro, array('id'=>$moduleinfo->instance));
 144     }
 145
 146     // Course_modules and course_sections each contain a reference to each other.
 147     // So we have to update one of them twice.
 148     $sectionid = course_add_cm_to_section($course, $moduleinfo->coursemodule, $moduleinfo->section);
 149
 150     // Trigger event based on the action we did.
 151     $event = \core\event\course_module_created::create(array(
 152          'courseid' => $course->id,
 153          'context'  => $modcontext,
 154          'objectid' => $moduleinfo->coursemodule,
 155          'other'    => array(
 156              'modulename' => $moduleinfo->modulename,
 157              'name'       => $moduleinfo->name,
 158              'instanceid' => $moduleinfo->instance
 159          )
 160     ));
 161     $event->trigger();
 162
 163     $moduleinfo = edit_module_post_actions($moduleinfo, $course);
 164     $transaction->allow_commit();
 165
 166     return $moduleinfo;
 167 }
 168
 169
 170 /**
 171  * Common create/update module module actions that need to be processed as soon as a module is created/updaded.
 172  * For example:create grade parent category, add outcomes, rebuild caches, regrade, save plagiarism settings...
 173  * Please note this api does not trigger events as of MOODLE 2.6. Please trigger events before calling this api.
 174  *
 175  * @param object $moduleinfo the module info
 176  * @param object $course the course of the module
 177  *
 178  * @return object moduleinfo update with grading management info
 179  */
 180 function edit_module_post_actions($moduleinfo, $course) {
 181     global $CFG;
 182
 183     $modcontext = context_module::instance($moduleinfo->coursemodule);
 184     $hasgrades = plugin_supports('mod', $moduleinfo->modulename, FEATURE_GRADE_HAS_GRADE, false);
 185     $hasoutcomes = plugin_supports('mod', $moduleinfo->modulename, FEATURE_GRADE_OUTCOMES, true);
 186
 187     // Sync idnumber with grade_item.
 188     if ($hasgrades && $grade_item = grade_item::fetch(array('itemtype'=>'mod', 'itemmodule'=>$moduleinfo->modulename,
 189                  'iteminstance'=>$moduleinfo->instance, 'itemnumber'=>0, 'courseid'=>$course->id))) {
 190         if ($grade_item->idnumber != $moduleinfo->cmidnumber) {
 191             $grade_item->idnumber = $moduleinfo->cmidnumber;
 192             $grade_item->update();
 193         }
 194     }
 195
 196     if ($hasgrades) {
 197         $items = grade_item::fetch_all(array('itemtype'=>'mod', 'itemmodule'=>$moduleinfo->modulename,
 198                                          'iteminstance'=>$moduleinfo->instance, 'courseid'=>$course->id));
 199     } else {
 200         $items = array();
 201     }
 202
 203     // Create parent category if requested and move to correct parent category.
 204     if ($items and isset($moduleinfo->gradecat)) {
 205         if ($moduleinfo->gradecat == -1) {
 206             $grade_category = new grade_category();
 207             $grade_category->courseid = $course->id;
 208             $grade_category->fullname = $moduleinfo->name;
 209             $grade_category->insert();
 210             if ($grade_item) {
 211                 $parent = $grade_item->get_parent_category();
 212                 $grade_category->set_parent($parent->id);
 213             }
 214             $moduleinfo->gradecat = $grade_category->id;
 215         }
 216         foreach ($items as $itemid=>$unused) {
 217             $items[$itemid]->set_parent($moduleinfo->gradecat);
 218             if ($itemid == $grade_item->id) {
 219                 // Use updated grade_item.
 220                 $grade_item = $items[$itemid];
 221             }
 222         }
 223     }
 224
 225     require_once($CFG->libdir.'/grade/grade_outcome.php');
 226     // Add outcomes if requested.
 227     if ($hasoutcomes && $outcomes = grade_outcome::fetch_all_available($course->id)) {
 228         $grade_items = array();
 229
 230         // Outcome grade_item.itemnumber start at 1000, there is nothing above outcomes.
 231         $max_itemnumber = 999;
 232         if ($items) {
 233             foreach($items as $item) {
 234                 if ($item->itemnumber > $max_itemnumber) {
 235                     $max_itemnumber = $item->itemnumber;
 236                 }
 237             }
 238         }
 239
 240         foreach($outcomes as $outcome) {
 241             $elname = 'outcome_'.$outcome->id;
 242
 243             if (property_exists($moduleinfo, $elname) and $moduleinfo->$elname) {
 244                 // So we have a request for new outcome grade item?
 245                 if ($items) {
 246                     $outcomeexists = false;
 247                     foreach($items as $item) {
 248                         if ($item->outcomeid == $outcome->id) {
 249                             $outcomeexists = true;
 250                             break;
 251                         }
 252                     }
 253                     if ($outcomeexists) {
 254                         continue;
 255                     }
 256                 }
 257
 258                 $max_itemnumber++;
 259
 260                 $outcome_item = new grade_item();
 261                 $outcome_item->courseid     = $course->id;
 262                 $outcome_item->itemtype     = 'mod';
 263                 $outcome_item->itemmodule   = $moduleinfo->modulename;
 264                 $outcome_item->iteminstance = $moduleinfo->instance;
 265                 $outcome_item->itemnumber   = $max_itemnumber;
 266                 $outcome_item->itemname     = $outcome->fullname;
 267                 $outcome_item->outcomeid    = $outcome->id;
 268                 $outcome_item->gradetype    = GRADE_TYPE_SCALE;
 269                 $outcome_item->scaleid      = $outcome->scaleid;
 270                 $outcome_item->insert();
 271
 272                 // Move the new outcome into correct category and fix sortorder if needed.
 273                 if ($grade_item) {
 274                     $outcome_item->set_parent($grade_item->categoryid);
 275                     $outcome_item->move_after_sortorder($grade_item->sortorder);
 276
 277                 } else if (isset($moduleinfo->gradecat)) {
 278                     $outcome_item->set_parent($moduleinfo->gradecat);
 279                 }
 280             }
 281         }
 282     }
 283
 284     if (plugin_supports('mod', $moduleinfo->modulename, FEATURE_ADVANCED_GRADING, false)
 285             and has_capability('moodle/grade:managegradingforms', $modcontext)) {
 286         require_once($CFG->dirroot.'/grade/grading/lib.php');
 287         $gradingman = get_grading_manager($modcontext, 'mod_'.$moduleinfo->modulename);
 288         $showgradingmanagement = false;
 289         foreach ($gradingman->get_available_areas() as $areaname => $aretitle) {
 290             $formfield = 'advancedgradingmethod_'.$areaname;
 291             if (isset($moduleinfo->{$formfield})) {
 292                 $gradingman->set_area($areaname);
 293                 $methodchanged = $gradingman->set_active_method($moduleinfo->{$formfield});
 294                 if (empty($moduleinfo->{$formfield})) {
 295                     // Going back to the simple direct grading is not a reason to open the management screen.
 296                     $methodchanged = false;
 297                 }
 298                 $showgradingmanagement = $showgradingmanagement || $methodchanged;
 299             }
 300         }
 301         // Update grading management information.
 302         $moduleinfo->gradingman = $gradingman;
 303         $moduleinfo->showgradingmanagement = $showgradingmanagement;
 304     }
 305
 306     rebuild_course_cache($course->id, true);
 307     if ($hasgrades) {
 308         grade_regrade_final_grades($course->id);
 309     }
 310     require_once($CFG->libdir.'/plagiarismlib.php');
 311     plagiarism_save_form_elements($moduleinfo);
 312
 313     return $moduleinfo;
 314 }
 315
 316
 317 /**
 318  * Set module info default values for the unset module attributs.
 319  *
 320  * @param object $moduleinfo the current known data of the module
 321  * @return object the completed module info
 322  */
 323 function set_moduleinfo_defaults($moduleinfo) {
 324
 325     if (empty($moduleinfo->coursemodule)) {
 326         // Add.
 327         $cm = null;
 328         $moduleinfo->instance     = '';
 329         $moduleinfo->coursemodule = '';
 330     } else {
 331         // Update.
 332         $cm = get_coursemodule_from_id('', $moduleinfo->coursemodule, 0, false, MUST_EXIST);
 333         $moduleinfo->instance     = $cm->instance;
 334         $moduleinfo->coursemodule = $cm->id;
 335     }
 336     // For safety.
 337     $moduleinfo->modulename = clean_param($moduleinfo->modulename, PARAM_PLUGIN);
 338
 339     if (!isset($moduleinfo->groupingid)) {
 340         $moduleinfo->groupingid = 0;
 341     }
 342
 343     if (!isset($moduleinfo->groupmembersonly)) {
 344         $moduleinfo->groupmembersonly = 0;
 345     }
 346
 347     if (!isset($moduleinfo->name)) { // Label.
 348         $moduleinfo->name = $moduleinfo->modulename;
 349     }
 350
 351     if (!isset($moduleinfo->completion)) {
 352         $moduleinfo->completion = COMPLETION_DISABLED;
 353     }
 354     if (!isset($moduleinfo->completionview)) {
 355         $moduleinfo->completionview = COMPLETION_VIEW_NOT_REQUIRED;
 356     }
 357     if (!isset($moduleinfo->completionexpected)) {
 358         $moduleinfo->completionexpected = 0;
 359     }
 360
 361     // Convert the 'use grade' checkbox into a grade-item number: 0 if checked, null if not.
 362     if (isset($moduleinfo->completionusegrade) && $moduleinfo->completionusegrade) {
 363         $moduleinfo->completiongradeitemnumber = 0;
 364     } else {
 365         $moduleinfo->completiongradeitemnumber = null;
 366     }
 367
 368     if (!isset($moduleinfo->conditiongradegroup)) {
 369         $moduleinfo->conditiongradegroup = array();
 370     }
 371     if (!isset($moduleinfo->conditionfieldgroup)) {
 372         $moduleinfo->conditionfieldgroup = array();
 373     }
 374
 375     return $moduleinfo;
 376 }
 377
 378 /**
 379  * Check that the user can add a module. Also returns some information like the module, context and course section info.
 380  * The fucntion create the course section if it doesn't exist.
 381  *
 382  * @param object $course the course of the module
 383  * @param object $modulename the module name
 384  * @param object $section the section of the module
 385  * @return array list containing module, context, course section.
 386  * @throws moodle_exception if user is not allowed to perform the action or module is not allowed in this course
 387  */
 388 function can_add_moduleinfo($course, $modulename, $section) {
 389     global $DB;
 390
 391     $module = $DB->get_record('modules', array('name'=>$modulename), '*', MUST_EXIST);
 392
 393     $context = context_course::instance($course->id);
 394     require_capability('moodle/course:manageactivities', $context);
 395
 396     course_create_sections_if_missing($course, $section);
 397     $cw = get_fast_modinfo($course)->get_section_info($section);
 398
 399     if (!course_allowed_module($course, $module->name)) {
 400         print_error('moduledisable');
 401     }
 402
 403     return array($module, $context, $cw);
 404 }
 405
 406 /**
 407  * Check if user is allowed to update module info and returns related item/data to the module.
 408  *
 409  * @param object $cm course module
 410  * @return array - list of course module, context, module, moduleinfo, and course section.
 411  * @throws moodle_exception if user is not allowed to perform the action
 412  */
 413 function can_update_moduleinfo($cm) {
 414     global $DB;
 415
 416     // Check the $USER has the right capability.
 417     $context = context_module::instance($cm->id);
 418     require_capability('moodle/course:manageactivities', $context);
 419
 420     // Check module exists.
 421     $module = $DB->get_record('modules', array('id'=>$cm->module), '*', MUST_EXIST);
 422
 423     // Check the moduleinfo exists.
 424     $data = $DB->get_record($module->name, array('id'=>$cm->instance), '*', MUST_EXIST);
 425
 426     // Check the course section exists.
 427     $cw = $DB->get_record('course_sections', array('id'=>$cm->section), '*', MUST_EXIST);
 428
 429     return array($cm, $context, $module, $data, $cw);
 430 }
 431
 432
 433 /**
 434  * Update the module info.
 435  * This function doesn't check the user capabilities. It updates the course module and the module instance.
 436  * Then execute common action to create/update module process (trigger event, rebuild cache, save plagiarism settings...).
 437  *
 438  * @param object $cm course module
 439  * @param object $moduleinfo module info
 440  * @param object $course course of the module
 441  * @param object $mform - the mform is required by some specific module in the function MODULE_update_instance(). This is due to a hack in this function.
 442  * @return array list of course module and module info.
 443  */
 444 function update_moduleinfo($cm, $moduleinfo, $course, $mform = null) {
 445     global $DB, $CFG;
 446
 447     // Attempt to include module library before we make any changes to DB.
 448     include_modulelib($moduleinfo->modulename);
 449
 450     $moduleinfo->course = $course->id;
 451     $moduleinfo = set_moduleinfo_defaults($moduleinfo);
 452
 453     if (!empty($course->groupmodeforce) or !isset($moduleinfo->groupmode)) {
 454         $moduleinfo->groupmode = $cm->groupmode; // Keep original.
 455     }
 456
 457     // Update course module first.
 458     $cm->groupmode = $moduleinfo->groupmode;
 459     if (isset($moduleinfo->groupingid)) {
 460         $cm->groupingid = $moduleinfo->groupingid;
 461     }
 462     if (isset($moduleinfo->groupmembersonly)) {
 463         $cm->groupmembersonly = $moduleinfo->groupmembersonly;
 464     }
 465
 466     $completion = new completion_info($course);
 467     if ($completion->is_enabled() && !empty($moduleinfo->completionunlocked)) {
 468         // Update completion settings.
 469         $cm->completion                = $moduleinfo->completion;
 470         $cm->completiongradeitemnumber = $moduleinfo->completiongradeitemnumber;
 471         $cm->completionview            = $moduleinfo->completionview;
 472         $cm->completionexpected        = $moduleinfo->completionexpected;
 473     }
 474     if (!empty($CFG->enableavailability)) {
 475         // This code is used both when submitting the form, which uses a long
 476         // name to avoid clashes, and by unit test code which uses the real
 477         // name in the table.
 478         if (property_exists($moduleinfo, 'availabilityconditionsjson')) {
 479             if ($moduleinfo->availabilityconditionsjson !== '') {
 480                 $cm->availability = $moduleinfo->availabilityconditionsjson;
 481             } else {
 482                 $cm->availability = null;
 483             }
 484         } else if (property_exists($moduleinfo, 'availability')) {
 485             $cm->availability = $moduleinfo->availability;
 486         }
 487     }
 488     if (isset($moduleinfo->showdescription)) {
 489         $cm->showdescription = $moduleinfo->showdescription;
 490     } else {
 491         $cm->showdescription = 0;
 492     }
 493
 494     $DB->update_record('course_modules', $cm);
 495
 496     $modcontext = context_module::instance($moduleinfo->coursemodule);
 497
 498     // Update embedded links and save files.
 499     if (plugin_supports('mod', $moduleinfo->modulename, FEATURE_MOD_INTRO, true)) {
 500         $moduleinfo->intro = file_save_draft_area_files($moduleinfo->introeditor['itemid'], $modcontext->id,
 501                                                       'mod_'.$moduleinfo->modulename, 'intro', 0,
 502                                                       array('subdirs'=>true), $moduleinfo->introeditor['text']);
 503         $moduleinfo->introformat = $moduleinfo->introeditor['format'];
 504         unset($moduleinfo->introeditor);
 505     }
 506     $updateinstancefunction = $moduleinfo->modulename."_update_instance";
 507     if (!$updateinstancefunction($moduleinfo, $mform)) {
 508         print_error('cannotupdatemod', '', course_get_url($course, $cw->section), $moduleinfo->modulename);
 509     }
 510
 511     // Make sure visibility is set correctly (in particular in calendar).
 512     if (has_capability('moodle/course:activityvisibility', $modcontext)) {
 513         set_coursemodule_visible($moduleinfo->coursemodule, $moduleinfo->visible);
 514     }
 515
 516     if (isset($moduleinfo->cmidnumber)) { // Label.
 517         // Set cm idnumber - uniqueness is already verified by form validation.
 518         set_coursemodule_idnumber($moduleinfo->coursemodule, $moduleinfo->cmidnumber);
 519     }
 520
 521     // Now that module is fully updated, also update completion data if required.
 522     // (this will wipe all user completion data and recalculate it)
 523     if ($completion->is_enabled() && !empty($moduleinfo->completionunlocked)) {
 524         $completion->reset_all_state($cm);
 525     }
 526
 527     // Trigger event based on the action we did.
 528     $event = \core\event\course_module_updated::create(array(
 529         'courseid' => $course->id,
 530         'context'  => $modcontext,
 531         'objectid' => $moduleinfo->coursemodule,
 532         'other'    => array(
 533             'modulename' => $moduleinfo->modulename,
 534             'name'       => $moduleinfo->name,
 535             'instanceid' => $moduleinfo->instance
 536         )
 537     ));
 538     $event->trigger();
 539
 540     $moduleinfo = edit_module_post_actions($moduleinfo, $course);
 541
 542     return array($cm, $moduleinfo);
 543 }
 544
 545 /**
 546  * Include once the module lib file.
 547  *
 548  * @param string $modulename module name of the lib to include
 549  * @throws moodle_exception if lib.php file for the module does not exist
 550  */
 551 function include_modulelib($modulename) {
 552     global $CFG;
 553     $modlib = "$CFG->dirroot/mod/$modulename/lib.php";
 554     if (file_exists($modlib)) {
 555         include_once($modlib);
 556     } else {
 557         throw new moodle_exception('modulemissingcode', '', '', $modlib);
 558     }
 559 }
 560