mod/assign/locallib.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  * This file contains the definition for the class assignment
  19  *
  20  * This class provides all the functionality for the new assign module.
  21  *
  22  * @package   mod_assign
  23  * @copyright 2012 NetSpot {@link http://www.netspot.com.au}
  24  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27 defined('MOODLE_INTERNAL') || die();
  28
  29 // Assignment submission statuses.
  30 define('ASSIGN_SUBMISSION_STATUS_DRAFT', 'draft');
  31 define('ASSIGN_SUBMISSION_STATUS_SUBMITTED', 'submitted');
  32
  33 // Search filters for grading page.
  34 define('ASSIGN_FILTER_SUBMITTED', 'submitted');
  35 define('ASSIGN_FILTER_SINGLE_USER', 'singleuser');
  36 define('ASSIGN_FILTER_REQUIRE_GRADING', 'require_grading');
  37
  38 require_once($CFG->libdir . '/accesslib.php');
  39 require_once($CFG->libdir . '/formslib.php');
  40 require_once($CFG->dirroot . '/repository/lib.php');
  41 require_once($CFG->dirroot . '/mod/assign/mod_form.php');
  42 require_once($CFG->libdir . '/gradelib.php');
  43 require_once($CFG->dirroot . '/grade/grading/lib.php');
  44 require_once($CFG->dirroot . '/mod/assign/feedbackplugin.php');
  45 require_once($CFG->dirroot . '/mod/assign/submissionplugin.php');
  46 require_once($CFG->dirroot . '/mod/assign/renderable.php');
  47 require_once($CFG->dirroot . '/mod/assign/gradingtable.php');
  48 require_once($CFG->libdir . '/eventslib.php');
  49 require_once($CFG->libdir . '/portfolio/caller.php');
  50
  51 /**
  52  * Standard base class for mod_assign (assignment types).
  53  *
  54  * @package   mod_assign
  55  * @copyright 2012 NetSpot {@link http://www.netspot.com.au}
  56  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  57  */
  58 class assign {
  59
  60     /** @var stdClass the assignment record that contains the global settings for this assign instance */
  61     private $instance;
  62
  63     /** @var context the context of the course module for this assign instance
  64      *               (or just the course if we are creating a new one)
  65      */
  66     private $context;
  67
  68     /** @var stdClass the course this assign instance belongs to */
  69     private $course;
  70
  71     /** @var stdClass the admin config for all assign instances  */
  72     private $adminconfig;
  73
  74     /** @var assign_renderer the custom renderer for this module */
  75     private $output;
  76
  77     /** @var stdClass the course module for this assign instance */
  78     private $coursemodule;
  79
  80     /** @var array cache for things like the coursemodule name or the scale menu -
  81      *             only lives for a single request.
  82      */
  83     private $cache;
  84
  85     /** @var array list of the installed submission plugins */
  86     private $submissionplugins;
  87
  88     /** @var array list of the installed feedback plugins */
  89     private $feedbackplugins;
  90
  91     /** @var string action to be used to return to this page
  92      *              (without repeating any form submissions etc).
  93      */
  94     private $returnaction = 'view';
  95
  96     /** @var array params to be used to return to this page */
  97     private $returnparams = array();
  98
  99     /** @var string modulename prevents excessive calls to get_string */
 100     private static $modulename = null;
 101
 102     /** @var string modulenameplural prevents excessive calls to get_string */
 103     private static $modulenameplural = null;
 104
 105     /**
 106      * Constructor for the base assign class.
 107      *
 108      * @param mixed $coursemodulecontext context|null the course module context
 109      *                                   (or the course context if the coursemodule has not been
 110      *                                   created yet).
 111      * @param mixed $coursemodule the current course module if it was already loaded,
 112      *                            otherwise this class will load one from the context as required.
 113      * @param mixed $course the current course  if it was already loaded,
 114      *                      otherwise this class will load one from the context as required.
 115      */
 116     public function __construct($coursemodulecontext, $coursemodule, $course) {
 117         global $PAGE;
 118
 119         $this->context = $coursemodulecontext;
 120         $this->coursemodule = $coursemodule;
 121         $this->course = $course;
 122
 123         // Temporary cache only lives for a single request - used to reduce db lookups.
 124         $this->cache = array();
 125
 126         $this->submissionplugins = $this->load_plugins('assignsubmission');
 127         $this->feedbackplugins = $this->load_plugins('assignfeedback');
 128     }
 129
 130     /**
 131      * Set the action and parameters that can be used to return to the current page.
 132      *
 133      * @param string $action The action for the current page
 134      * @param array $params An array of name value pairs which form the parameters
 135      *                      to return to the current page.
 136      * @return void
 137      */
 138     public function register_return_link($action, $params) {
 139         $this->returnaction = $action;
 140         $this->returnparams = $params;
 141     }
 142
 143     /**
 144      * Return an action that can be used to get back to the current page.
 145      *
 146      * @return string action
 147      */
 148     public function get_return_action() {
 149         return $this->returnaction;
 150     }
 151
 152     /**
 153      * Based on the current assignment settings should we display the intro.
 154      *
 155      * @return bool showintro
 156      */
 157     protected function show_intro() {
 158         if ($this->get_instance()->alwaysshowdescription ||
 159                 time() > $this->get_instance()->allowsubmissionsfromdate) {
 160             return true;
 161         }
 162         return false;
 163     }
 164
 165     /**
 166      * Return a list of parameters that can be used to get back to the current page.
 167      *
 168      * @return array params
 169      */
 170     public function get_return_params() {
 171         return $this->returnparams;
 172     }
 173
 174     /**
 175      * Set the submitted form data.
 176      *
 177      * @param stdClass $data The form data (instance)
 178      */
 179     public function set_instance(stdClass $data) {
 180         $this->instance = $data;
 181     }
 182
 183     /**
 184      * Set the context.
 185      *
 186      * @param context $context The new context
 187      */
 188     public function set_context(context $context) {
 189         $this->context = $context;
 190     }
 191
 192     /**
 193      * Set the course data.
 194      *
 195      * @param stdClass $course The course data
 196      */
 197     public function set_course(stdClass $course) {
 198         $this->course = $course;
 199     }
 200
 201     /**
 202      * Get list of feedback plugins installed.
 203      *
 204      * @return array
 205      */
 206     public function get_feedback_plugins() {
 207         return $this->feedbackplugins;
 208     }
 209
 210     /**
 211      * Get list of submission plugins installed.
 212      *
 213      * @return array
 214      */
 215     public function get_submission_plugins() {
 216         return $this->submissionplugins;
 217     }
 218
 219     /**
 220      * Is blind marking enabled and reveal identities not set yet?
 221      *
 222      * @return bool
 223      */
 224     public function is_blind_marking() {
 225         return $this->get_instance()->blindmarking && !$this->get_instance()->revealidentities;
 226     }
 227
 228     /**
 229      * Does an assignment have submission(s) or grade(s) already?
 230      *
 231      * @return bool
 232      */
 233     public function has_submissions_or_grades() {
 234         $allgrades = $this->count_grades();
 235         $allsubmissions = $this->count_submissions();
 236         if (($allgrades == 0) && ($allsubmissions == 0)) {
 237             return false;
 238         }
 239         return true;
 240     }
 241
 242     /**
 243      * Get a specific submission plugin by its type.
 244      *
 245      * @param string $subtype assignsubmission | assignfeedback
 246      * @param string $type
 247      * @return mixed assign_plugin|null
 248      */
 249     public function get_plugin_by_type($subtype, $type) {
 250         $shortsubtype = substr($subtype, strlen('assign'));
 251         $name = $shortsubtype . 'plugins';
 252         if ($name != 'feedbackplugins' && $name != 'submissionplugins') {
 253             return null;
 254         }
 255         $pluginlist = $this->$name;
 256         foreach ($pluginlist as $plugin) {
 257             if ($plugin->get_type() == $type) {
 258                 return $plugin;
 259             }
 260         }
 261         return null;
 262     }
 263
 264     /**
 265      * Get a feedback plugin by type.
 266      *
 267      * @param string $type - The type of plugin e.g comments
 268      * @return mixed assign_feedback_plugin|null
 269      */
 270     public function get_feedback_plugin_by_type($type) {
 271         return $this->get_plugin_by_type('assignfeedback', $type);
 272     }
 273
 274     /**
 275      * Get a submission plugin by type.
 276      *
 277      * @param string $type - The type of plugin e.g comments
 278      * @return mixed assign_submission_plugin|null
 279      */
 280     public function get_submission_plugin_by_type($type) {
 281         return $this->get_plugin_by_type('assignsubmission', $type);
 282     }
 283
 284     /**
 285      * Load the plugins from the sub folders under subtype.
 286      *
 287      * @param string $subtype - either submission or feedback
 288      * @return array - The sorted list of plugins
 289      */
 290     protected function load_plugins($subtype) {
 291         global $CFG;
 292         $result = array();
 293
 294         $names = get_plugin_list($subtype);
 295
 296         foreach ($names as $name => $path) {
 297             if (file_exists($path . '/locallib.php')) {
 298                 require_once($path . '/locallib.php');
 299
 300                 $shortsubtype = substr($subtype, strlen('assign'));
 301                 $pluginclass = 'assign_' . $shortsubtype . '_' . $name;
 302
 303                 $plugin = new $pluginclass($this, $name);
 304
 305                 if ($plugin instanceof assign_plugin) {
 306                     $idx = $plugin->get_sort_order();
 307                     while (array_key_exists($idx, $result)) {
 308                         $idx +=1;
 309                     }
 310                     $result[$idx] = $plugin;
 311                 }
 312             }
 313         }
 314         ksort($result);
 315         return $result;
 316     }
 317
 318     /**
 319      * Display the assignment, used by view.php
 320      *
 321      * The assignment is displayed differently depending on your role,
 322      * the settings for the assignment and the status of the assignment.
 323      *
 324      * @param string $action The current action if any.
 325      * @return void
 326      */
 327     public function view($action='') {
 328
 329         $o = '';
 330         $mform = null;
 331         $notices = array();
 332
 333         // Handle form submissions first.
 334         if ($action == 'savesubmission') {
 335             $action = 'editsubmission';
 336             if ($this->process_save_submission($mform, $notices)) {
 337                 $action = 'view';
 338             }
 339         } else if ($action == 'lock') {
 340             $this->process_lock();
 341             $action = 'grading';
 342         } else if ($action == 'reverttodraft') {
 343             $this->process_revert_to_draft();
 344             $action = 'grading';
 345         } else if ($action == 'unlock') {
 346             $this->process_unlock();
 347             $action = 'grading';
 348         } else if ($action == 'confirmsubmit') {
 349             $action = 'submit';
 350             if ($this->process_submit_for_grading($mform)) {
 351                 $action = 'view';
 352             }
 353         } else if ($action == 'gradingbatchoperation') {
 354             $action = $this->process_grading_batch_operation($mform);
 355         } else if ($action == 'submitgrade') {
 356             if (optional_param('saveandshownext', null, PARAM_RAW)) {
 357                 // Save and show next.
 358                 $action = 'grade';
 359                 if ($this->process_save_grade($mform)) {
 360                     $action = 'nextgrade';
 361                 }
 362             } else if (optional_param('nosaveandprevious', null, PARAM_RAW)) {
 363                 $action = 'previousgrade';
 364             } else if (optional_param('nosaveandnext', null, PARAM_RAW)) {
 365                 // Show next button.
 366                 $action = 'nextgrade';
 367             } else if (optional_param('savegrade', null, PARAM_RAW)) {
 368                 // Save changes button.
 369                 $action = 'grade';
 370                 if ($this->process_save_grade($mform)) {
 371                     $action = 'grading';
 372                 }
 373             } else {
 374                 // Cancel button.
 375                 $action = 'grading';
 376             }
 377         } else if ($action == 'quickgrade') {
 378             $message = $this->process_save_quick_grades();
 379             $action = 'quickgradingresult';
 380         } else if ($action == 'saveoptions') {
 381             $this->process_save_grading_options();
 382             $action = 'grading';
 383         } else if ($action == 'saveextension') {
 384             $action = 'grantextension';
 385             if ($this->process_save_extension($mform)) {
 386                 $action = 'grading';
 387             }
 388         } else if ($action == 'revealidentitiesconfirm') {
 389             $this->process_reveal_identities();
 390             $action = 'grading';
 391         }
 392
 393         $returnparams = array('rownum'=>optional_param('rownum', 0, PARAM_INT));
 394         $this->register_return_link($action, $returnparams);
 395
 396         // Now show the right view page.
 397         if ($action == 'previousgrade') {
 398             $mform = null;
 399             $o .= $this->view_single_grade_page($mform, -1);
 400         } else if ($action == 'quickgradingresult') {
 401             $mform = null;
 402             $o .= $this->view_quickgrading_result($message);
 403         } else if ($action == 'nextgrade') {
 404             $mform = null;
 405             $o .= $this->view_single_grade_page($mform, 1);
 406         } else if ($action == 'grade') {
 407             $o .= $this->view_single_grade_page($mform);
 408         } else if ($action == 'viewpluginassignfeedback') {
 409             $o .= $this->view_plugin_content('assignfeedback');
 410         } else if ($action == 'viewpluginassignsubmission') {
 411             $o .= $this->view_plugin_content('assignsubmission');
 412         } else if ($action == 'editsubmission') {
 413             $o .= $this->view_edit_submission_page($mform, $notices);
 414         } else if ($action == 'grading') {
 415             $o .= $this->view_grading_page();
 416         } else if ($action == 'downloadall') {
 417             $o .= $this->download_submissions();
 418         } else if ($action == 'submit') {
 419             $o .= $this->check_submit_for_grading($mform);
 420         } else if ($action == 'grantextension') {
 421             $o .= $this->view_grant_extension($mform);
 422         } else if ($action == 'revealidentities') {
 423             $o .= $this->view_reveal_identities_confirm($mform);
 424         } else if ($action == 'plugingradingbatchoperation') {
 425             $o .= $this->view_plugin_grading_batch_operation($mform);
 426         } else if ($action == 'viewpluginpage') {
 427              $o .= $this->view_plugin_page();
 428         } else if ($action == 'viewcourseindex') {
 429              $o .= $this->view_course_index();
 430         } else {
 431             $o .= $this->view_submission_page();
 432         }
 433
 434         return $o;
 435     }
 436
 437     /**
 438      * Add this instance to the database.
 439      *
 440      * @param stdClass $formdata The data submitted from the form
 441      * @param bool $callplugins This is used to skip the plugin code
 442      *             when upgrading an old assignment to a new one (the plugins get called manually)
 443      * @return mixed false if an error occurs or the int id of the new instance
 444      */
 445     public function add_instance(stdClass $formdata, $callplugins) {
 446         global $DB;
 447
 448         $err = '';
 449
 450         // Add the database record.
 451         $update = new stdClass();
 452         $update->name = $formdata->name;
 453         $update->timemodified = time();
 454         $update->timecreated = time();
 455         $update->course = $formdata->course;
 456         $update->courseid = $formdata->course;
 457         $update->intro = $formdata->intro;
 458         $update->introformat = $formdata->introformat;
 459         $update->alwaysshowdescription = $formdata->alwaysshowdescription;
 460         $update->submissiondrafts = $formdata->submissiondrafts;
 461         $update->requiresubmissionstatement = $formdata->requiresubmissionstatement;
 462         $update->sendnotifications = $formdata->sendnotifications;
 463         $update->sendlatenotifications = $formdata->sendlatenotifications;
 464         $update->duedate = $formdata->duedate;
 465         $update->cutoffdate = $formdata->cutoffdate;
 466         $update->allowsubmissionsfromdate = $formdata->allowsubmissionsfromdate;
 467         $update->grade = $formdata->grade;
 468         $update->completionsubmit = !empty($formdata->completionsubmit);
 469         $update->teamsubmission = $formdata->teamsubmission;
 470         $update->requireallteammemberssubmit = $formdata->requireallteammemberssubmit;
 471         $update->teamsubmissiongroupingid = $formdata->teamsubmissiongroupingid;
 472         $update->blindmarking = $formdata->blindmarking;
 473
 474         $returnid = $DB->insert_record('assign', $update);
 475         $this->instance = $DB->get_record('assign', array('id'=>$returnid), '*', MUST_EXIST);
 476         // Cache the course record.
 477         $this->course = $DB->get_record('course', array('id'=>$formdata->course), '*', MUST_EXIST);
 478
 479         if ($callplugins) {
 480             // Call save_settings hook for submission plugins.
 481             foreach ($this->submissionplugins as $plugin) {
 482                 if (!$this->update_plugin_instance($plugin, $formdata)) {
 483                     print_error($plugin->get_error());
 484                     return false;
 485                 }
 486             }
 487             foreach ($this->feedbackplugins as $plugin) {
 488                 if (!$this->update_plugin_instance($plugin, $formdata)) {
 489                     print_error($plugin->get_error());
 490                     return false;
 491                 }
 492             }
 493
 494             // In the case of upgrades the coursemodule has not been set,
 495             // so we need to wait before calling these two.
 496             $this->update_calendar($formdata->coursemodule);
 497             $this->update_gradebook(false, $formdata->coursemodule);
 498
 499         }
 500
 501         $update = new stdClass();
 502         $update->id = $this->get_instance()->id;
 503         $update->nosubmissions = (!$this->is_any_submission_plugin_enabled()) ? 1: 0;
 504         $DB->update_record('assign', $update);
 505
 506         return $returnid;
 507     }
 508
 509     /**
 510      * Delete all grades from the gradebook for this assignment.
 511      *
 512      * @return bool
 513      */
 514     protected function delete_grades() {
 515         global $CFG;
 516
 517         $result = grade_update('mod/assign',
 518                                $this->get_course()->id,
 519                                'mod',
 520                                'assign',
 521                                $this->get_instance()->id,
 522                                0,
 523                                null,
 524                                array('deleted'=>1));
 525         return $result == GRADE_UPDATE_OK;
 526     }
 527
 528     /**
 529      * Delete this instance from the database.
 530      *
 531      * @return bool false if an error occurs
 532      */
 533     public function delete_instance() {
 534         global $DB;
 535         $result = true;
 536
 537         foreach ($this->submissionplugins as $plugin) {
 538             if (!$plugin->delete_instance()) {
 539                 print_error($plugin->get_error());
 540                 $result = false;
 541             }
 542         }
 543         foreach ($this->feedbackplugins as $plugin) {
 544             if (!$plugin->delete_instance()) {
 545                 print_error($plugin->get_error());
 546                 $result = false;
 547             }
 548         }
 549
 550         // Delete files associated with this assignment.
 551         $fs = get_file_storage();
 552         if (! $fs->delete_area_files($this->context->id) ) {
 553             $result = false;
 554         }
 555
 556         // Delete_records will throw an exception if it fails - so no need for error checking here.
 557         $DB->delete_records('assign_submission', array('assignment'=>$this->get_instance()->id));
 558         $DB->delete_records('assign_grades', array('assignment'=>$this->get_instance()->id));
 559         $DB->delete_records('assign_plugin_config', array('assignment'=>$this->get_instance()->id));
 560
 561         // Delete items from the gradebook.
 562         if (! $this->delete_grades()) {
 563             $result = false;
 564         }
 565
 566         // Delete the instance.
 567         $DB->delete_records('assign', array('id'=>$this->get_instance()->id));
 568
 569         return $result;
 570     }
 571
 572     /**
 573      * Actual implementation of the reset course functionality, delete all the
 574      * assignment submissions for course $data->courseid.
 575      *
 576      * @param $data the data submitted from the reset course.
 577      * @return array status array
 578      */
 579     public function reset_userdata($data) {
 580         global $CFG, $DB;
 581
 582         $componentstr = get_string('modulenameplural', 'assign');
 583         $status = array();
 584
 585         $fs = get_file_storage();
 586         if (!empty($data->reset_assign_submissions)) {
 587             // Delete files associated with this assignment.
 588             foreach ($this->submissionplugins as $plugin) {
 589                 $fileareas = array();
 590                 $plugincomponent = $plugin->get_subtype() . '_' . $plugin->get_type();
 591                 $fileareas = $plugin->get_file_areas();
 592                 foreach ($fileareas as $filearea) {
 593                     $fs->delete_area_files($this->context->id, $plugincomponent, $filearea);
 594                 }
 595
 596                 if (!$plugin->delete_instance()) {
 597                     $status[] = array('component'=>$componentstr,
 598                                       'item'=>get_string('deleteallsubmissions', 'assign'),
 599                                       'error'=>$plugin->get_error());
 600                 }
 601             }
 602
 603             foreach ($this->feedbackplugins as $plugin) {
 604                 $fileareas = array();
 605                 $plugincomponent = $plugin->get_subtype() . '_' . $plugin->get_type();
 606                 $fileareas = $plugin->get_file_areas();
 607                 foreach ($fileareas as $filearea) {
 608                     $fs->delete_area_files($this->context->id, $plugincomponent, $filearea);
 609                 }
 610
 611                 if (!$plugin->delete_instance()) {
 612                     $status[] = array('component'=>$componentstr,
 613                                       'item'=>get_string('deleteallsubmissions', 'assign'),
 614                                       'error'=>$plugin->get_error());
 615                 }
 616             }
 617
 618             $assignssql = 'SELECT a.id
 619                              FROM {assign} a
 620                            WHERE a.course=:course';
 621             $params = array('course'=>$data->courseid);
 622
 623             $DB->delete_records_select('assign_submission', "assignment IN ($assignssql)", $params);
 624
 625             $status[] = array('component'=>$componentstr,
 626                               'item'=>get_string('deleteallsubmissions', 'assign'),
 627                               'error'=>false);
 628
 629             if (!empty($data->reset_gradebook_grades)) {
 630                 $DB->delete_records_select('assign_grades', "assignment IN ($assignssql)", $params);
 631                 // Remove all grades from gradebook.
 632                 require_once($CFG->dirroot.'/mod/assign/lib.php');
 633                 assign_reset_gradebook($data->courseid);
 634             }
 635         }
 636         // Updating dates - shift may be negative too.
 637         if ($data->timeshift) {
 638             shift_course_mod_dates('assign',
 639                                     array('duedate', 'allowsubmissionsfromdate', 'cutoffdate'),
 640                                     $data->timeshift,
 641                                     $data->courseid);
 642             $status[] = array('component'=>$componentstr,
 643                               'item'=>get_string('datechanged'),
 644                               'error'=>false);
 645         }
 646
 647         return $status;
 648     }
 649
 650     /**
 651      * Update the settings for a single plugin.
 652      *
 653      * @param assign_plugin $plugin The plugin to update
 654      * @param stdClass $formdata The form data
 655      * @return bool false if an error occurs
 656      */
 657     protected function update_plugin_instance(assign_plugin $plugin, stdClass $formdata) {
 658         if ($plugin->is_visible()) {
 659             $enabledname = $plugin->get_subtype() . '_' . $plugin->get_type() . '_enabled';
 660             if ($formdata->$enabledname) {
 661                 $plugin->enable();
 662                 if (!$plugin->save_settings($formdata)) {
 663                     print_error($plugin->get_error());
 664                     return false;
 665                 }
 666             } else {
 667                 $plugin->disable();
 668             }
 669         }
 670         return true;
 671     }
 672
 673     /**
 674      * Update the gradebook information for this assignment.
 675      *
 676      * @param bool $reset If true, will reset all grades in the gradbook for this assignment
 677      * @param int $coursemoduleid This is required because it might not exist in the database yet
 678      * @return bool
 679      */
 680     public function update_gradebook($reset, $coursemoduleid) {
 681         global $CFG;
 682
 683         require_once($CFG->dirroot.'/mod/assign/lib.php');
 684         $assign = clone $this->get_instance();
 685         $assign->cmidnumber = $coursemoduleid;
 686         $param = null;
 687         if ($reset) {
 688             $param = 'reset';
 689         }
 690
 691         return assign_grade_item_update($assign, $param);
 692     }
 693
 694     /**
 695      * Load and cache the admin config for this module.
 696      *
 697      * @return stdClass the plugin config
 698      */
 699     public function get_admin_config() {
 700         if ($this->adminconfig) {
 701             return $this->adminconfig;
 702         }
 703         $this->adminconfig = get_config('assign');
 704         return $this->adminconfig;
 705     }
 706
 707     /**
 708      * Update the calendar entries for this assignment.
 709      *
 710      * @param int $coursemoduleid - Required to pass this in because it might
 711      *                              not exist in the database yet.
 712      * @return bool
 713      */
 714     public function update_calendar($coursemoduleid) {
 715         global $DB, $CFG;
 716         require_once($CFG->dirroot.'/calendar/lib.php');
 717
 718         // Special case for add_instance as the coursemodule has not been set yet.
 719         $instance = $this->get_instance();
 720
 721         if ($instance->duedate) {
 722             $event = new stdClass();
 723
 724             $params = array('modulename'=>'assign', 'instance'=>$instance->id);
 725             $event->id = $DB->get_field('event',
 726                                         'id',
 727                                         $params);
 728
 729             if ($event->id) {
 730                 $event->name        = $instance->name;
 731                 $event->description = format_module_intro('assign', $instance, $coursemoduleid);
 732                 $event->timestart   = $instance->duedate;
 733
 734                 $calendarevent = calendar_event::load($event->id);
 735                 $calendarevent->update($event);
 736             } else {
 737                 $event = new stdClass();
 738                 $event->name        = $instance->name;
 739                 $event->description = format_module_intro('assign', $instance, $coursemoduleid);
 740                 $event->courseid    = $instance->course;
 741                 $event->groupid     = 0;
 742                 $event->userid      = 0;
 743                 $event->modulename  = 'assign';
 744                 $event->instance    = $instance->id;
 745                 $event->eventtype   = 'due';
 746                 $event->timestart   = $instance->duedate;
 747                 $event->timeduration = 0;
 748
 749                 calendar_event::create($event);
 750             }
 751         } else {
 752             $DB->delete_records('event', array('modulename'=>'assign', 'instance'=>$instance->id));
 753         }
 754     }
 755
 756
 757     /**
 758      * Update this instance in the database.
 759      *
 760      * @param stdClass $formdata - the data submitted from the form
 761      * @return bool false if an error occurs
 762      */
 763     public function update_instance($formdata) {
 764         global $DB;
 765
 766         $update = new stdClass();
 767         $update->id = $formdata->instance;
 768         $update->name = $formdata->name;
 769         $update->timemodified = time();
 770         $update->course = $formdata->course;
 771         $update->intro = $formdata->intro;
 772         $update->introformat = $formdata->introformat;
 773         $update->alwaysshowdescription = $formdata->alwaysshowdescription;
 774         $update->submissiondrafts = $formdata->submissiondrafts;
 775         $update->requiresubmissionstatement = $formdata->requiresubmissionstatement;
 776         $update->sendnotifications = $formdata->sendnotifications;
 777         $update->sendlatenotifications = $formdata->sendlatenotifications;
 778         $update->duedate = $formdata->duedate;
 779         $update->cutoffdate = $formdata->cutoffdate;
 780         $update->allowsubmissionsfromdate = $formdata->allowsubmissionsfromdate;
 781         $update->grade = $formdata->grade;
 782         $update->completionsubmit = !empty($formdata->completionsubmit);
 783         $update->teamsubmission = $formdata->teamsubmission;
 784         $update->requireallteammemberssubmit = $formdata->requireallteammemberssubmit;
 785         $update->teamsubmissiongroupingid = $formdata->teamsubmissiongroupingid;
 786         $update->blindmarking = $formdata->blindmarking;
 787
 788         $result = $DB->update_record('assign', $update);
 789         $this->instance = $DB->get_record('assign', array('id'=>$update->id), '*', MUST_EXIST);
 790
 791         // Load the assignment so the plugins have access to it.
 792
 793         // Call save_settings hook for submission plugins.
 794         foreach ($this->submissionplugins as $plugin) {
 795             if (!$this->update_plugin_instance($plugin, $formdata)) {
 796                 print_error($plugin->get_error());
 797                 return false;
 798             }
 799         }
 800         foreach ($this->feedbackplugins as $plugin) {
 801             if (!$this->update_plugin_instance($plugin, $formdata)) {
 802                 print_error($plugin->get_error());
 803                 return false;
 804             }
 805         }
 806
 807         $this->update_calendar($this->get_course_module()->id);
 808         $this->update_gradebook(false, $this->get_course_module()->id);
 809
 810         $update = new stdClass();
 811         $update->id = $this->get_instance()->id;
 812         $update->nosubmissions = (!$this->is_any_submission_plugin_enabled()) ? 1: 0;
 813         $DB->update_record('assign', $update);
 814
 815         return $result;
 816     }
 817
 818     /**
 819      * Add elements in grading plugin form.
 820      *
 821      * @param mixed $grade stdClass|null
 822      * @param MoodleQuickForm $mform
 823      * @param stdClass $data
 824      * @param int $userid - The userid we are grading
 825      * @return void
 826      */
 827     protected function add_plugin_grade_elements($grade, MoodleQuickForm $mform, stdClass $data, $userid) {
 828         foreach ($this->feedbackplugins as $plugin) {
 829             if ($plugin->is_enabled() && $plugin->is_visible()) {
 830                 $mform->addElement('header', 'header_' . $plugin->get_type(), $plugin->get_name());
 831                 if (!$plugin->get_form_elements_for_user($grade, $mform, $data, $userid)) {
 832                     $mform->removeElement('header_' . $plugin->get_type());
 833                 }
 834             }
 835         }
 836     }
 837
 838
 839
 840     /**
 841      * Add one plugins settings to edit plugin form.
 842      *
 843      * @param assign_plugin $plugin The plugin to add the settings from
 844      * @param MoodleQuickForm $mform The form to add the configuration settings to.
 845      *                               This form is modified directly (not returned).
 846      * @return void
 847      */
 848     protected function add_plugin_settings(assign_plugin $plugin, MoodleQuickForm $mform) {
 849         global $CFG;
 850         if ($plugin->is_visible()) {
 851             $mform->addElement('selectyesno',
 852                                $plugin->get_subtype() . '_' . $plugin->get_type() . '_enabled',
 853                                $plugin->get_name());
 854             $mform->addHelpButton($plugin->get_subtype() . '_' . $plugin->get_type() . '_enabled',
 855                                   'enabled',
 856                                   $plugin->get_subtype() . '_' . $plugin->get_type());
 857
 858             $default = get_config($plugin->get_subtype() . '_' . $plugin->get_type(), 'default');
 859             if ($plugin->get_config('enabled') !== false) {
 860                 $default = $plugin->is_enabled();
 861             }
 862             $mform->setDefault($plugin->get_subtype() . '_' . $plugin->get_type() . '_enabled', $default);
 863
 864             $plugin->get_settings($mform);
 865
 866         }
 867     }
 868
 869     /**
 870      * Add settings to edit plugin form.
 871      *
 872      * @param MoodleQuickForm $mform The form to add the configuration settings to.
 873      *                               This form is modified directly (not returned).
 874      * @return void
 875      */
 876     public function add_all_plugin_settings(MoodleQuickForm $mform) {
 877         $mform->addElement('header', 'general', get_string('submissionsettings', 'assign'));
 878
 879         foreach ($this->submissionplugins as $plugin) {
 880             $this->add_plugin_settings($plugin, $mform);
 881
 882         }
 883         $mform->addElement('header', 'general', get_string('feedbacksettings', 'assign'));
 884         foreach ($this->feedbackplugins as $plugin) {
 885             $this->add_plugin_settings($plugin, $mform);
 886         }
 887     }
 888
 889     /**
 890      * Allow each plugin an opportunity to update the defaultvalues
 891      * passed in to the settings form (needed to set up draft areas for
 892      * editor and filemanager elements)
 893      *
 894      * @param array $defaultvalues
 895      */
 896     public function plugin_data_preprocessing(&$defaultvalues) {
 897         foreach ($this->submissionplugins as $plugin) {
 898             if ($plugin->is_visible()) {
 899                 $plugin->data_preprocessing($defaultvalues);
 900             }
 901         }
 902         foreach ($this->feedbackplugins as $plugin) {
 903             if ($plugin->is_visible()) {
 904                 $plugin->data_preprocessing($defaultvalues);
 905             }
 906         }
 907     }
 908
 909     /**
 910      * Get the name of the current module.
 911      *
 912      * @return string the module name (Assignment)
 913      */
 914     protected function get_module_name() {
 915         if (isset(self::$modulename)) {
 916             return self::$modulename;
 917         }
 918         self::$modulename = get_string('modulename', 'assign');
 919         return self::$modulename;
 920     }
 921
 922     /**
 923      * Get the plural name of the current module.
 924      *
 925      * @return string the module name plural (Assignments)
 926      */
 927     protected function get_module_name_plural() {
 928         if (isset(self::$modulenameplural)) {
 929             return self::$modulenameplural;
 930         }
 931         self::$modulenameplural = get_string('modulenameplural', 'assign');
 932         return self::$modulenameplural;
 933     }
 934
 935     /**
 936      * Has this assignment been constructed from an instance?
 937      *
 938      * @return bool
 939      */
 940     public function has_instance() {
 941         return $this->instance || $this->get_course_module();
 942     }
 943
 944     /**
 945      * Get the settings for the current instance of this assignment
 946      *
 947      * @return stdClass The settings
 948      */
 949     public function get_instance() {
 950         global $DB;
 951         if ($this->instance) {
 952             return $this->instance;
 953         }
 954         if ($this->get_course_module()) {
 955             $params = array('id' => $this->get_course_module()->instance);
 956             $this->instance = $DB->get_record('assign', $params, '*', MUST_EXIST);
 957         }
 958         if (!$this->instance) {
 959             throw new coding_exception('Improper use of the assignment class. ' .
 960                                        'Cannot load the assignment record.');
 961         }
 962         return $this->instance;
 963     }
 964
 965     /**
 966      * Get the context of the current course.
 967      *
 968      * @return mixed context|null The course context
 969      */
 970     public function get_course_context() {
 971         if (!$this->context && !$this->course) {
 972             throw new coding_exception('Improper use of the assignment class. ' .
 973                                        'Cannot load the course context.');
 974         }
 975         if ($this->context) {
 976             return $this->context->get_course_context();
 977         } else {
 978             return context_course::instance($this->course->id);
 979         }
 980     }
 981
 982
 983     /**
 984      * Get the current course module.
 985      *
 986      * @return mixed stdClass|null The course module
 987      */
 988     public function get_course_module() {
 989         if ($this->coursemodule) {
 990             return $this->coursemodule;
 991         }
 992         if (!$this->context) {
 993             return null;
 994         }
 995
 996         if ($this->context->contextlevel == CONTEXT_MODULE) {
 997             $this->coursemodule = get_coursemodule_from_id('assign',
 998                                                            $this->context->instanceid,
 999                                                            0,
1000                                                            false,
1001                                                            MUST_EXIST);
1002             return $this->coursemodule;
1003         }
1004         return null;
1005     }
1006
1007     /**
1008      * Get context module.
1009      *
1010      * @return context
1011      */
1012     public function get_context() {
1013         return $this->context;
1014     }
1015
1016     /**
1017      * Get the current course.
1018      *
1019      * @return mixed stdClass|null The course
1020      */
1021     public function get_course() {
1022         global $DB;
1023
1024         if ($this->course) {
1025             return $this->course;
1026         }
1027
1028         if (!$this->context) {
1029             return null;
1030         }
1031         $params = array('id' => $this->get_course_context()->instanceid);
1032         $this->course = $DB->get_record('course', $params, '*', MUST_EXIST);
1033
1034         return $this->course;
1035     }
1036
1037     /**
1038      * Return a grade in user-friendly form, whether it's a scale or not.
1039      *
1040      * @param mixed $grade int|null
1041      * @param boolean $editing Are we allowing changes to this grade?
1042      * @param int $userid The user id the grade belongs to
1043      * @param int $modified Timestamp from when the grade was last modified
1044      * @return string User-friendly representation of grade
1045      */
1046     public function display_grade($grade, $editing, $userid=0, $modified=0) {
1047         global $DB;
1048
1049         static $scalegrades = array();
1050
1051         $o = '';
1052
1053         if ($this->get_instance()->grade >= 0) {
1054             // Normal number.
1055             if ($editing && $this->get_instance()->grade > 0) {
1056                 if ($grade < 0) {
1057                     $displaygrade = '';
1058                 } else {
1059                     $displaygrade = format_float($grade);
1060                 }
1061                 $o .= '<label class="accesshide" for="quickgrade_' . $userid . '">' .
1062                        get_string('usergrade', 'assign') .
1063                        '</label>';
1064                 $o .= '<input type="text"
1065                               id="quickgrade_' . $userid . '"
1066                               name="quickgrade_' . $userid . '"
1067                               value="' .  $displaygrade . '"
1068                               size="6"
1069                               maxlength="10"
1070                               class="quickgrade"/>';
1071                 $o .= '&nbsp;/&nbsp;' . format_float($this->get_instance()->grade, 2);
1072                 $o .= '<input type="hidden"
1073                               name="grademodified_' . $userid . '"
1074                               value="' . $modified . '"/>';
1075                 return $o;
1076             } else {
1077                 $o .= '<input type="hidden" name="grademodified_' . $userid . '" value="' . $modified . '"/>';
1078                 if ($grade == -1 || $grade === null) {
1079                     $o .= '-';
1080                     return $o;
1081                 } else {
1082                     $o .= format_float($grade, 2) .
1083                           '&nbsp;/&nbsp;' .
1084                           format_float($this->get_instance()->grade, 2);
1085                     return $o;
1086                 }
1087             }
1088
1089         } else {
1090             // Scale.
1091             if (empty($this->cache['scale'])) {
1092                 if ($scale = $DB->get_record('scale', array('id'=>-($this->get_instance()->grade)))) {
1093                     $this->cache['scale'] = make_menu_from_list($scale->scale);
1094                 } else {
1095                     $o .= '-';
1096                     return $o;
1097                 }
1098             }
1099             if ($editing) {
1100                 $o .= '<label class="accesshide"
1101                               for="quickgrade_' . $userid . '">' .
1102                       get_string('usergrade', 'assign') .
1103                       '</label>';
1104                 $o .= '<select name="quickgrade_' . $userid . '" class="quickgrade">';
1105                 $o .= '<option value="-1">' . get_string('nograde') . '</option>';
1106                 foreach ($this->cache['scale'] as $optionid => $option) {
1107                     $selected = '';
1108                     if ($grade == $optionid) {
1109                         $selected = 'selected="selected"';
1110                     }
1111                     $o .= '<option value="' . $optionid . '" ' . $selected . '>' . $option . '</option>';
1112                 }
1113                 $o .= '</select>';
1114                 $o .= '<input type="hidden" ' .
1115                              'name="grademodified_' . $userid . '" ' .
1116                              'value="' . $modified . '"/>';
1117                 return $o;
1118             } else {
1119                 $scaleid = (int)$grade;
1120                 if (isset($this->cache['scale'][$scaleid])) {
1121                     $o .= $this->cache['scale'][$scaleid];
1122                     return $o;
1123                 }
1124                 $o .= '-';
1125                 return $o;
1126             }
1127         }
1128     }
1129
1130     /**
1131      * Load a list of users enrolled in the current course with the specified permission and group.
1132      * 0 for no group.
1133      *
1134      * @param int $currentgroup
1135      * @param bool $idsonly
1136      * @return array List of user records
1137      */
1138     public function list_participants($currentgroup, $idsonly) {
1139         if ($idsonly) {
1140             return get_enrolled_users($this->context, 'mod/assign:submit', $currentgroup, 'u.id');
1141         } else {
1142             return get_enrolled_users($this->context, 'mod/assign:submit', $currentgroup);
1143         }
1144     }
1145
1146     /**
1147      * Load a count of valid teams for this assignment.
1148      *
1149      * @return int number of valid teams
1150      */
1151     public function count_teams() {
1152
1153         $groups = groups_get_all_groups($this->get_course()->id,
1154                                         0,
1155                                         $this->get_instance()->teamsubmissiongroupingid,
1156                                         'g.id');
1157         $count = count($groups);
1158
1159         // See if there are any users in the default group.
1160         $defaultusers = $this->get_submission_group_members(0, true);
1161         if (count($defaultusers) > 0) {
1162             $count += 1;
1163         }
1164         return $count;
1165     }
1166
1167     /**
1168      * Load a count of users enrolled in the current course with the specified permission and group.
1169      * 0 for no group.
1170      *
1171      * @param int $currentgroup
1172      * @return int number of matching users
1173      */
1174     public function count_participants($currentgroup) {
1175         return count_enrolled_users($this->context, 'mod/assign:submit', $currentgroup);
1176     }
1177
1178     /**
1179      * Load a count of users submissions in the current module that require grading
1180      * This means the submission modification time is more recent than the
1181      * grading modification time and the status is SUBMITTED.
1182      *
1183      * @return int number of matching submissions
1184      */
1185     public function count_submissions_need_grading() {
1186         global $DB;
1187
1188         if ($this->get_instance()->teamsubmission) {
1189             // This does not make sense for group assignment because the submission is shared.
1190             return 0;
1191         }
1192
1193         $currentgroup = groups_get_activity_group($this->get_course_module(), true);
1194         list($esql, $params) = get_enrolled_sql($this->get_context(), 'mod/assign:submit', $currentgroup, false);
1195
1196         $params['assignid'] = $this->get_instance()->id;
1197         $params['submitted'] = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
1198
1199         $sql = 'SELECT COUNT(s.userid)
1200                    FROM {assign_submission} s
1201                    LEFT JOIN {assign_grades} g ON
1202                         s.assignment = g.assignment AND
1203                         s.userid = g.userid
1204                    JOIN(' . $esql . ') e ON e.id = s.userid
1205                    WHERE
1206                         s.assignment = :assignid AND
1207                         s.timemodified IS NOT NULL AND
1208                         s.status = :submitted AND
1209                         (s.timemodified > g.timemodified OR g.timemodified IS NULL)';
1210
1211         return $DB->count_records_sql($sql, $params);
1212     }
1213
1214     /**
1215      * Load a count of grades.
1216      *
1217      * @return int number of grades
1218      */
1219     public function count_grades() {
1220         global $DB;
1221
1222         if (!$this->has_instance()) {
1223             return 0;
1224         }
1225
1226         $currentgroup = groups_get_activity_group($this->get_course_module(), true);
1227         list($esql, $params) = get_enrolled_sql($this->get_context(), 'mod/assign:submit', $currentgroup, false);
1228
1229         $params['assignid'] = $this->get_instance()->id;
1230
1231         $sql = 'SELECT COUNT(g.userid)
1232                    FROM {assign_grades} g
1233                    JOIN(' . $esql . ') e ON e.id = g.userid
1234                    WHERE g.assignment = :assignid';
1235
1236         return $DB->count_records_sql($sql, $params);
1237     }
1238
1239     /**
1240      * Load a count of submissions.
1241      *
1242      * @return int number of submissions
1243      */
1244     public function count_submissions() {
1245         global $DB;
1246
1247         if (!$this->has_instance()) {
1248             return 0;
1249         }
1250
1251         $params = array();
1252
1253         if ($this->get_instance()->teamsubmission) {
1254             // We cannot join on the enrolment tables for group submissions (no userid).
1255             $sql = 'SELECT COUNT(s.groupid)
1256                         FROM {assign_submission} s
1257                         WHERE
1258                             s.assignment = :assignid AND
1259                             s.timemodified IS NOT NULL AND
1260                             s.userid = :groupuserid';
1261
1262             $params['assignid'] = $this->get_instance()->id;
1263             $params['groupuserid'] = 0;
1264         } else {
1265             $currentgroup = groups_get_activity_group($this->get_course_module(), true);
1266             list($esql, $params) = get_enrolled_sql($this->get_context(), 'mod/assign:submit', $currentgroup, false);
1267
1268             $params['assignid'] = $this->get_instance()->id;
1269
1270             $sql = 'SELECT COUNT(s.userid)
1271                        FROM {assign_submission} s
1272                        JOIN(' . $esql . ') e ON e.id = s.userid
1273                        WHERE
1274                             s.assignment = :assignid AND
1275                             s.timemodified IS NOT NULL';
1276         }
1277
1278         return $DB->count_records_sql($sql, $params);
1279     }
1280
1281     /**
1282      * Load a count of submissions with a specified status.
1283      *
1284      * @param string $status The submission status - should match one of the constants
1285      * @return int number of matching submissions
1286      */
1287     public function count_submissions_with_status($status) {
1288         global $DB;
1289
1290         $currentgroup = groups_get_activity_group($this->get_course_module(), true);
1291         list($esql, $params) = get_enrolled_sql($this->get_context(), 'mod/assign:submit', $currentgroup, false);
1292
1293         $params['assignid'] = $this->get_instance()->id;
1294         $params['submissionstatus'] = $status;
1295
1296         if ($this->get_instance()->teamsubmission) {
1297             $sql = 'SELECT COUNT(s.groupid)
1298                         FROM {assign_submission} s
1299                         WHERE
1300                             s.assignment = :assignid AND
1301                             s.timemodified IS NOT NULL AND
1302                             s.userid = :groupuserid AND
1303                             s.status = :submissionstatus';
1304             $params['groupuserid'] = 0;
1305         } else {
1306             $sql = 'SELECT COUNT(s.userid)
1307                         FROM {assign_submission} s
1308                         JOIN(' . $esql . ') e ON e.id = s.userid
1309                         WHERE
1310                             s.assignment = :assignid AND
1311                             s.timemodified IS NOT NULL AND
1312                             s.status = :submissionstatus';
1313         }
1314
1315         return $DB->count_records_sql($sql, $params);
1316     }
1317
1318     /**
1319      * Utility function to get the userid for every row in the grading table
1320      * so the order can be frozen while we iterate it.
1321      *
1322      * @return array An array of userids
1323      */
1324     protected function get_grading_userid_list() {
1325         $filter = get_user_preferences('assign_filter', '');
1326         $table = new assign_grading_table($this, 0, $filter, 0, false);
1327
1328         $useridlist = $table->get_column_data('userid');
1329
1330         return $useridlist;
1331     }
1332
1333     /**
1334      * Generate zip file from array of given files.
1335      *
1336      * @param array $filesforzipping - array of files to pass into archive_to_pathname.
1337      *                                 This array is indexed by the final file name and each
1338      *                                 element in the array is an instance of a stored_file object.
1339      * @return path of temp file - note this returned file does
1340      *         not have a .zip extension - it is a temp file.
1341      */
1342     protected function pack_files($filesforzipping) {
1343         global $CFG;
1344         // Create path for new zip file.
1345         $tempzip = tempnam($CFG->tempdir . '/', 'assignment_');
1346         // Zip files.
1347         $zipper = new zip_packer();
1348         if ($zipper->archive_to_pathname($filesforzipping, $tempzip)) {
1349             return $tempzip;
1350         }
1351         return false;
1352     }
1353
1354     /**
1355      * Finds all assignment notifications that have yet to be mailed out, and mails them.
1356      *
1357      * Cron function to be run periodically according to the moodle cron.
1358      *
1359      * @return bool
1360      */
1361     public static function cron() {
1362         global $DB;
1363
1364         // Only ever send a max of one days worth of updates.
1365         $yesterday = time() - (24 * 3600);
1366         $timenow   = time();
1367
1368         // Collect all submissions from the past 24 hours that require mailing.
1369         $sql = 'SELECT s.*, a.course, a.name, a.blindmarking, a.revealidentities,
1370                        g.*, g.id as gradeid, g.timemodified as lastmodified
1371                  FROM {assign} a
1372                  JOIN {assign_grades} g ON g.assignment = a.id
1373             LEFT JOIN {assign_submission} s ON s.assignment = a.id AND s.userid = g.userid
1374                 WHERE g.timemodified >= :yesterday AND
1375                       g.timemodified <= :today AND
1376                       g.mailed = 0';
1377
1378         $params = array('yesterday' => $yesterday, 'today' => $timenow);
1379         $submissions = $DB->get_records_sql($sql, $params);
1380
1381         if (empty($submissions)) {
1382             return true;
1383         }
1384
1385         mtrace('Processing ' . count($submissions) . ' assignment submissions ...');
1386
1387         // Preload courses we are going to need those.
1388         $courseids = array();
1389         foreach ($submissions as $submission) {
1390             $courseids[] = $submission->course;
1391         }
1392
1393         // Filter out duplicates.
1394         $courseids = array_unique($courseids);
1395         $ctxselect = context_helper::get_preload_record_columns_sql('ctx');
1396         list($courseidsql, $params) = $DB->get_in_or_equal($courseids, SQL_PARAMS_NAMED);
1397         $sql = 'SELECT c.*, ' . $ctxselect .
1398                   ' FROM {course} c
1399              LEFT JOIN {context} ctx ON ctx.instanceid = c.id AND ctx.contextlevel = :contextlevel
1400                  WHERE c.id ' . $courseidsql;
1401
1402         $params['contextlevel'] = CONTEXT_COURSE;
1403         $courses = $DB->get_records_sql($sql, $params);
1404
1405         // Clean up... this could go on for a while.
1406         unset($courseids);
1407         unset($ctxselect);
1408         unset($courseidsql);
1409         unset($params);
1410
1411         // Simple array we'll use for caching modules.
1412         $modcache = array();
1413
1414         // Message students about new feedback.
1415         foreach ($submissions as $submission) {
1416
1417             mtrace("Processing assignment submission $submission->id ...");
1418
1419             // Do not cache user lookups - could be too many.
1420             if (!$user = $DB->get_record('user', array('id'=>$submission->userid))) {
1421                 mtrace('Could not find user ' . $submission->userid);
1422                 continue;
1423             }
1424
1425             // Use a cache to prevent the same DB queries happening over and over.
1426             if (!array_key_exists($submission->course, $courses)) {
1427                 mtrace('Could not find course ' . $submission->course);
1428                 continue;
1429             }
1430             $course = $courses[$submission->course];
1431             if (isset($course->ctxid)) {
1432                 // Context has not yet been preloaded. Do so now.
1433                 context_helper::preload_from_record($course);
1434             }
1435
1436             // Override the language and timezone of the "current" user, so that
1437             // mail is customised for the receiver.
1438             cron_setup_user($user, $course);
1439
1440             // Context lookups are already cached.
1441             $coursecontext = context_course::instance($course->id);
1442             if (!is_enrolled($coursecontext, $user->id)) {
1443                 $courseshortname = format_string($course->shortname,
1444                                                  true,
1445                                                  array('context' => $coursecontext));
1446                 mtrace(fullname($user) . ' not an active participant in ' . $courseshortname);
1447                 continue;
1448             }
1449
1450             if (!$grader = $DB->get_record('user', array('id'=>$submission->grader))) {
1451                 mtrace('Could not find grader ' . $submission->grader);
1452                 continue;
1453             }
1454
1455             if (!array_key_exists($submission->assignment, $modcache)) {
1456                 $mod = get_coursemodule_from_instance('assign', $submission->assignment, $course->id);
1457                 if (empty($mod)) {
1458                     mtrace('Could not find course module for assignment id ' . $submission->assignment);
1459                     continue;
1460                 }
1461                 $modcache[$submission->assignment] = $mod;
1462             } else {
1463                 $mod = $modcache[$submission->assignment];
1464             }
1465             // Context lookups are already cached.
1466             $contextmodule = context_module::instance($mod->id);
1467
1468             if (!$mod->visible) {
1469                 // Hold mail notification for hidden assignments until later.
1470                 continue;
1471             }
1472
1473             // Need to send this to the student.
1474             $messagetype = 'feedbackavailable';
1475             $eventtype = 'assign_notification';
1476             $updatetime = $submission->lastmodified;
1477             $modulename = get_string('modulename', 'assign');
1478
1479             $uniqueid = 0;
1480             if ($submission->blindmarking && !$submission->revealidentities) {
1481                 $uniqueid = self::get_uniqueid_for_user_static($submission->assignment, $user->id);
1482             }
1483             $showusers = $submission->blindmarking && !$submission->revealidentities;
1484             self::send_assignment_notification($grader,
1485                                                $user,
1486                                                $messagetype,
1487                                                $eventtype,
1488                                                $updatetime,
1489                                                $mod,
1490                                                $contextmodule,
1491                                                $course,
1492                                                $modulename,
1493                                                $submission->name,
1494                                                $showusers,
1495                                                $uniqueid);
1496
1497             $grade = new stdClass();
1498             $grade->id = $submission->gradeid;
1499             $grade->mailed = 1;
1500             $DB->update_record('assign_grades', $grade);
1501
1502             mtrace('Done');
1503         }
1504         mtrace('Done processing ' . count($submissions) . ' assignment submissions');
1505
1506         cron_setup_user();
1507
1508         // Free up memory just to be sure.
1509         unset($courses);
1510         unset($modcache);
1511
1512         return true;
1513     }
1514
1515     /**
1516      * Mark in the database that this grade record should have an update notification sent by cron.
1517      *
1518      * @param stdClass $grade a grade record keyed on id
1519      * @return bool true for success
1520      */
1521     public function notify_grade_modified($grade) {
1522         global $DB;
1523
1524         $grade->timemodified = time();
1525         if ($grade->mailed != 1) {
1526             $grade->mailed = 0;
1527         }
1528
1529         return $DB->update_record('assign_grades', $grade);
1530     }
1531
1532     /**
1533      * Update a grade in the grade table for the assignment and in the gradebook.
1534      *
1535      * @param stdClass $grade a grade record keyed on id
1536      * @return bool true for success
1537      */
1538     public function update_grade($grade) {
1539         global $DB;
1540
1541         $grade->timemodified = time();
1542
1543         if ($grade->grade && $grade->grade != -1) {
1544             if ($this->get_instance()->grade > 0) {
1545                 if (!is_numeric($grade->grade)) {
1546                     return false;
1547                 } else if ($grade->grade > $this->get_instance()->grade) {
1548                     return false;
1549                 } else if ($grade->grade < 0) {
1550                     return false;
1551                 }
1552             } else {
1553                 // This is a scale.
1554                 if ($scale = $DB->get_record('scale', array('id' => -($this->get_instance()->grade)))) {
1555                     $scaleoptions = make_menu_from_list($scale->scale);
1556                     if (!array_key_exists((int) $grade->grade, $scaleoptions)) {
1557                         return false;
1558                     }
1559                 }
1560             }
1561         }
1562
1563         $result = $DB->update_record('assign_grades', $grade);
1564         if ($result) {
1565             $this->gradebook_item_update(null, $grade);
1566         }
1567         return $result;
1568     }
1569
1570     /**
1571      * View the grant extension date page.
1572      *
1573      * Uses url parameters 'userid'
1574      * or from parameter 'selectedusers'
1575      *
1576      * @param moodleform $mform - Used for validation of the submitted data
1577      * @return string
1578      */
1579     protected function view_grant_extension($mform) {
1580         global $DB, $CFG;
1581         require_once($CFG->dirroot . '/mod/assign/extensionform.php');
1582
1583         $o = '';
1584         $batchusers = optional_param('selectedusers', '', PARAM_TEXT);
1585         $data = new stdClass();
1586         $data->extensionduedate = null;
1587         $userid = 0;
1588         if (!$batchusers) {
1589             $userid = required_param('userid', PARAM_INT);
1590
1591             $grade = $this->get_user_grade($userid, false);
1592
1593             $user = $DB->get_record('user', array('id'=>$userid), '*', MUST_EXIST);
1594
1595             if ($grade) {
1596                 $data->extensionduedate = $grade->extensionduedate;
1597             }
1598             $data->userid = $userid;
1599         } else {
1600             $data->batchusers = $batchusers;
1601         }
1602         $header = new assign_header($this->get_instance(),
1603                                     $this->get_context(),
1604                                     $this->show_intro(),
1605                                     $this->get_course_module()->id,
1606                                     get_string('grantextension', 'assign'));
1607         $o .= $this->get_renderer()->render($header);
1608
1609         if (!$mform) {
1610             $formparams = array($this->get_course_module()->id,
1611                                 $userid,
1612                                 $batchusers,
1613                                 $this->get_instance(),
1614                                 $data);
1615             $mform = new mod_assign_extension_form(null, $formparams);
1616         }
1617         $o .= $this->get_renderer()->render(new assign_form('extensionform', $mform));
1618         $o .= $this->view_footer();
1619         return $o;
1620     }
1621
1622     /**
1623      * Get a list of the users in the same group as this user.
1624      *
1625      * @param int $groupid The id of the group whose members we want or 0 for the default group
1626      * @param bool $onlyids Whether to retrieve only the user id's
1627      * @return array The users (possibly id's only)
1628      */
1629     public function get_submission_group_members($groupid, $onlyids) {
1630         $members = array();
1631         if ($groupid != 0) {
1632             if ($onlyids) {
1633                 $allusers = groups_get_members($groupid, 'u.id');
1634             } else {
1635                 $allusers = groups_get_members($groupid);
1636             }
1637             foreach ($allusers as $user) {
1638                 if ($this->get_submission_group($user->id)) {
1639                     $members[] = $user;
1640                 }
1641             }
1642         } else {
1643             $allusers = $this->list_participants(null, $onlyids);
1644             foreach ($allusers as $user) {
1645                 if ($this->get_submission_group($user->id) == null) {
1646                     $members[] = $user;
1647                 }
1648             }
1649         }
1650         return $members;
1651     }
1652
1653     /**
1654      * Get a list of the users in the same group as this user that have not submitted the assignment.
1655      *
1656      * @param int $groupid The id of the group whose members we want or 0 for the default group
1657      * @param bool $onlyids Whether to retrieve only the user id's
1658      * @return array The users (possibly id's only)
1659      */
1660     public function get_submission_group_members_who_have_not_submitted($groupid, $onlyids) {
1661         $instance = $this->get_instance();
1662         if (!$instance->teamsubmission || !$instance->requireallteammemberssubmit) {
1663             return array();
1664         }
1665         $members = $this->get_submission_group_members($groupid, $onlyids);
1666
1667         foreach ($members as $id => $member) {
1668             $submission = $this->get_user_submission($member->id, false);
1669             if ($submission && $submission->status != ASSIGN_SUBMISSION_STATUS_DRAFT) {
1670                 unset($members[$id]);
1671             } else {
1672                 if ($this->is_blind_marking()) {
1673                     $members[$id]->alias = get_string('hiddenuser', 'assign') .
1674                                            $this->get_uniqueid_for_user($id);
1675                 }
1676             }
1677         }
1678         return $members;
1679     }
1680
1681     /**
1682      * Load the group submission object for a particular user, optionally creating it if required.
1683      *
1684      * @param int $userid The id of the user whose submission we want
1685      * @param int $groupid The id of the group for this user - may be 0 in which
1686      *                     case it is determined from the userid.
1687      * @param bool $create If set to true a new submission object will be created in the database
1688      * @return stdClass The submission
1689      */
1690     public function get_group_submission($userid, $groupid, $create) {
1691         global $DB;
1692
1693         if ($groupid == 0) {
1694             $group = $this->get_submission_group($userid);
1695             if ($group) {
1696                 $groupid = $group->id;
1697             }
1698         }
1699
1700         if ($create) {
1701             // Make sure there is a submission for this user.
1702             $params = array('assignment'=>$this->get_instance()->id, 'groupid'=>0, 'userid'=>$userid);
1703             $submission = $DB->get_record('assign_submission', $params);
1704
1705             if (!$submission) {
1706                 $submission = new stdClass();
1707                 $submission->assignment = $this->get_instance()->id;
1708                 $submission->userid = $userid;
1709                 $submission->groupid = 0;
1710                 $submission->timecreated = time();
1711                 $submission->timemodified = $submission->timecreated;
1712
1713                 if ($this->get_instance()->submissiondrafts) {
1714                     $submission->status = ASSIGN_SUBMISSION_STATUS_DRAFT;
1715                 } else {
1716                     $submission->status = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
1717                 }
1718                 $DB->insert_record('assign_submission', $submission);
1719             }
1720         }
1721         // Now get the group submission.
1722         $params = array('assignment'=>$this->get_instance()->id, 'groupid'=>$groupid, 'userid'=>0);
1723         $submission = $DB->get_record('assign_submission', $params);
1724
1725         if ($submission) {
1726             return $submission;
1727         }
1728         if ($create) {
1729             $submission = new stdClass();
1730             $submission->assignment = $this->get_instance()->id;
1731             $submission->userid = 0;
1732             $submission->groupid = $groupid;
1733             $submission->timecreated = time();
1734             $submission->timemodified = $submission->timecreated;
1735
1736             if ($this->get_instance()->submissiondrafts) {
1737                 $submission->status = ASSIGN_SUBMISSION_STATUS_DRAFT;
1738             } else {
1739                 $submission->status = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
1740             }
1741             $sid = $DB->insert_record('assign_submission', $submission);
1742             $submission->id = $sid;
1743             return $submission;
1744         }
1745         return false;
1746     }
1747
1748     /**
1749      * View a summary listing of all assignments in the current course.
1750      *
1751      * @return string
1752      */
1753     private function view_course_index() {
1754         global $USER;
1755
1756         $o = '';
1757
1758         $course = $this->get_course();
1759         $strplural = get_string('modulenameplural', 'assign');
1760
1761         if (!$cms = get_coursemodules_in_course('assign', $course->id, 'm.duedate')) {
1762             $o .= $this->get_renderer()->notification(get_string('thereareno', 'moodle', $strplural));
1763             $o .= $this->get_renderer()->continue_button(new moodle_url('/course/view.php', array('id' => $course->id)));
1764             return $o;
1765         }
1766
1767         $strsectionname  = get_string('sectionname', 'format_'.$course->format);
1768         $usesections = course_format_uses_sections($course->format);
1769         $modinfo = get_fast_modinfo($course);
1770
1771         if ($usesections) {
1772             $sections = $modinfo->get_section_info_all();
1773         }
1774         $courseindexsummary = new assign_course_index_summary($usesections, $strsectionname);
1775
1776         $timenow = time();
1777
1778         $currentsection = '';
1779         foreach ($modinfo->instances['assign'] as $cm) {
1780             if (!$cm->uservisible) {
1781                 continue;
1782             }
1783
1784             $timedue = $cms[$cm->id]->duedate;
1785
1786             $sectionname = '';
1787             if ($usesections && $cm->sectionnum) {
1788                 $sectionname = get_section_name($course, $sections[$cm->sectionnum]);
1789             }
1790
1791             $submitted = '';
1792             $context = context_module::instance($cm->id);
1793
1794             $assignment = new assign($context, $cm, $course);
1795
1796             if (has_capability('mod/assign:grade', $context)) {
1797                 $submitted = $assignment->count_submissions_with_status(ASSIGN_SUBMISSION_STATUS_SUBMITTED);
1798
1799             } else if (has_capability('mod/assign:submit', $context)) {
1800                 $usersubmission = $assignment->get_user_submission($USER->id, false);
1801
1802                 if (!empty($usersubmission->status)) {
1803                     $submitted = get_string('submissionstatus_' . $usersubmission->status, 'assign');
1804                 } else {
1805                     $submitted = get_string('submissionstatus_', 'assign');
1806                 }
1807             }
1808             $grading_info = grade_get_grades($course->id, 'mod', 'assign', $cm->instance, $USER->id);
1809             if (isset($grading_info->items[0]) && !$grading_info->items[0]->grades[$USER->id]->hidden ) {
1810                 $grade = $grading_info->items[0]->grades[$USER->id]->str_grade;
1811             } else {
1812                 $grade = '-';
1813             }
1814
1815             $courseindexsummary->add_assign_info($cm->id, $cm->name, $sectionname, $timedue, $submitted, $grade);
1816
1817         }
1818
1819         $o .= $this->get_renderer()->render($courseindexsummary);
1820         $o .= $this->view_footer();
1821
1822         return $o;
1823     }
1824
1825     /**
1826      * View a page rendered by a plugin.
1827      *
1828      * Uses url parameters 'pluginaction', 'pluginsubtype', 'plugin', and 'id'.
1829      *
1830      * @return string
1831      */
1832     protected function view_plugin_page() {
1833         global $USER;
1834
1835         $o = '';
1836
1837         $pluginsubtype = required_param('pluginsubtype', PARAM_ALPHA);
1838         $plugintype = required_param('plugin', PARAM_TEXT);
1839         $pluginaction = required_param('pluginaction', PARAM_ALPHA);
1840
1841         $plugin = $this->get_plugin_by_type($pluginsubtype, $plugintype);
1842         if (!$plugin) {
1843             print_error('invalidformdata', '');
1844             return;
1845         }
1846
1847         $o .= $plugin->view_page($pluginaction);
1848
1849         return $o;
1850     }
1851
1852
1853     /**
1854      * This is used for team assignments to get the group for the specified user.
1855      * If the user is a member of multiple or no groups this will return false
1856      *
1857      * @param int $userid The id of the user whose submission we want
1858      * @return mixed The group or false
1859      */
1860     public function get_submission_group($userid) {
1861         $grouping = $this->get_instance()->teamsubmissiongroupingid;
1862         $groups = groups_get_all_groups($this->get_course()->id, $userid, $grouping);
1863         if (count($groups) != 1) {
1864             return false;
1865         }
1866         return array_pop($groups);
1867     }
1868
1869
1870     /**
1871      * Display the submission that is used by a plugin.
1872      *
1873      * Uses url parameters 'sid', 'gid' and 'plugin'.
1874      *
1875      * @param string $pluginsubtype
1876      * @return string
1877      */
1878     protected function view_plugin_content($pluginsubtype) {
1879         global $USER;
1880
1881         $o = '';
1882
1883         $submissionid = optional_param('sid', 0, PARAM_INT);
1884         $gradeid = optional_param('gid', 0, PARAM_INT);
1885         $plugintype = required_param('plugin', PARAM_TEXT);
1886         $item = null;
1887         if ($pluginsubtype == 'assignsubmission') {
1888             $plugin = $this->get_submission_plugin_by_type($plugintype);
1889             if ($submissionid <= 0) {
1890                 throw new coding_exception('Submission id should not be 0');
1891             }
1892             $item = $this->get_submission($submissionid);
1893
1894             // Check permissions.
1895             if ($item->userid != $USER->id) {
1896                 require_capability('mod/assign:grade', $this->context);
1897             }
1898             $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
1899                                                               $this->get_context(),
1900                                                               $this->show_intro(),
1901                                                               $this->get_course_module()->id,
1902                                                               $plugin->get_name()));
1903             $o .= $this->get_renderer()->render(new assign_submission_plugin_submission($plugin,
1904                                                               $item,
1905                                                               assign_submission_plugin_submission::FULL,
1906                                                               $this->get_course_module()->id,
1907                                                               $this->get_return_action(),
1908                                                               $this->get_return_params()));
1909
1910             $logmessage = get_string('viewsubmissionforuser', 'assign', $item->userid);
1911             $this->add_to_log('view submission', $logmessage);
1912         } else {
1913             $plugin = $this->get_feedback_plugin_by_type($plugintype);
1914             if ($gradeid <= 0) {
1915                 throw new coding_exception('Grade id should not be 0');
1916             }
1917             $item = $this->get_grade($gradeid);
1918             // Check permissions.
1919             if ($item->userid != $USER->id) {
1920                 require_capability('mod/assign:grade', $this->context);
1921             }
1922             $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
1923                                                               $this->get_context(),
1924                                                               $this->show_intro(),
1925                                                               $this->get_course_module()->id,
1926                                                               $plugin->get_name()));
1927             $o .= $this->get_renderer()->render(new assign_feedback_plugin_feedback($plugin,
1928                                                               $item,
1929                                                               assign_feedback_plugin_feedback::FULL,
1930                                                               $this->get_course_module()->id,
1931                                                               $this->get_return_action(),
1932                                                               $this->get_return_params()));
1933             $logmessage = get_string('viewfeedbackforuser', 'assign', $item->userid);
1934             $this->add_to_log('view feedback', $logmessage);
1935         }
1936
1937         $o .= $this->view_return_links();
1938
1939         $o .= $this->view_footer();
1940         return $o;
1941     }
1942
1943     /**
1944      * Rewrite plugin file urls so they resolve correctly in an exported zip.
1945      *
1946      * @param stdClass $user - The user record
1947      * @param assign_plugin $plugin - The assignment plugin
1948      */
1949     public function download_rewrite_pluginfile_urls($text, $user, $plugin) {
1950         $groupmode = groups_get_activity_groupmode($this->get_course_module());
1951         $groupname = '';
1952         if ($groupmode) {
1953             $groupid = groups_get_activity_group($this->get_course_module(), true);
1954             $groupname = groups_get_group_name($groupid).'-';
1955         }
1956
1957         if ($this->is_blind_marking()) {
1958             $prefix = $groupname . get_string('participant', 'assign');
1959             $prefix = str_replace('_', ' ', $prefix);
1960             $prefix = clean_filename($prefix . '_' . $this->get_uniqueid_for_user($user->id) . '_');
1961         } else {
1962             $prefix = $groupname . fullname($user);
1963             $prefix = str_replace('_', ' ', $prefix);
1964             $prefix = clean_filename($prefix . '_' . $this->get_uniqueid_for_user($user->id) . '_');
1965         }
1966
1967         $subtype = $plugin->get_subtype();
1968         $type = $plugin->get_type();
1969         $prefix = $prefix . $subtype . '_' . $type . '_';
1970
1971         $result = str_replace('@@PLUGINFILE@@/', $prefix, $text);
1972
1973         return $result;
1974     }
1975
1976     /**
1977      * Render the content in editor that is often used by plugin.
1978      *
1979      * @param string $filearea
1980      * @param int  $submissionid
1981      * @param string $plugintype
1982      * @param string $editor
1983      * @param string $component
1984      * @return string
1985      */
1986     public function render_editor_content($filearea, $submissionid, $plugintype, $editor, $component) {
1987         global $CFG;
1988
1989         $result = '';
1990
1991         $plugin = $this->get_submission_plugin_by_type($plugintype);
1992
1993         $text = $plugin->get_editor_text($editor, $submissionid);
1994         $format = $plugin->get_editor_format($editor, $submissionid);
1995
1996         $finaltext = file_rewrite_pluginfile_urls($text,
1997                                                   'pluginfile.php',
1998                                                   $this->get_context()->id,
1999                                                   $component,
2000                                                   $filearea,
2001                                                   $submissionid);
2002         $params = array('overflowdiv' => true, 'context' => $this->get_context());
2003         $result .= format_text($finaltext, $format, $params);
2004
2005         if ($CFG->enableportfolios) {
2006             require_once($CFG->libdir . '/portfoliolib.php');
2007
2008             $button = new portfolio_add_button();
2009             $portfolioparams = array('cmid' => $this->get_course_module()->id,
2010                                      'sid' => $submissionid,
2011                                      'plugin' => $plugintype,
2012                                      'editor' => $editor,
2013                                      'area'=>$filearea);
2014             $button->set_callback_options('assign_portfolio_caller', $portfolioparams, 'mod_assign');
2015             $fs = get_file_storage();
2016
2017             if ($files = $fs->get_area_files($this->context->id,
2018                                              $component,
2019                                              $filearea,
2020                                              $submissionid,
2021                                              'timemodified',
2022                                              false)) {
2023                 $button->set_formats(PORTFOLIO_FORMAT_RICHHTML);
2024             } else {
2025                 $button->set_formats(PORTFOLIO_FORMAT_PLAINHTML);
2026             }
2027             $result .= $button->to_html();
2028         }
2029         return $result;
2030     }
2031
2032     /**
2033      * Display a grading error.
2034      *
2035      * @param string $message - The description of the result
2036      * @return string
2037      */
2038     protected function view_quickgrading_result($message) {
2039         $o = '';
2040         $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
2041                                                       $this->get_context(),
2042                                                       $this->show_intro(),
2043                                                       $this->get_course_module()->id,
2044                                                       get_string('quickgradingresult', 'assign')));
2045         $gradingresult = new assign_quickgrading_result($message, $this->get_course_module()->id);
2046         $o .= $this->get_renderer()->render($gradingresult);
2047         $o .= $this->view_footer();
2048         return $o;
2049     }
2050
2051     /**
2052      * Display the page footer.
2053      *
2054      * @return string
2055      */
2056     protected function view_footer() {
2057         return $this->get_renderer()->render_footer();
2058     }
2059
2060     /**
2061      * Does this user have grade permission for this assignment?
2062      *
2063      * @return bool
2064      */
2065     protected function can_grade() {
2066         // Permissions check.
2067         if (!has_capability('mod/assign:grade', $this->context)) {
2068             return false;
2069         }
2070
2071         return true;
2072     }
2073
2074     /**
2075      * Download a zip file of all assignment submissions.
2076      *
2077      * @return void
2078      */
2079     protected function download_submissions() {
2080         global $CFG, $DB;
2081
2082         // More efficient to load this here.
2083         require_once($CFG->libdir.'/filelib.php');
2084
2085         // Load all users with submit.
2086         $students = get_enrolled_users($this->context, "mod/assign:submit");
2087
2088         // Build a list of files to zip.
2089         $filesforzipping = array();
2090         $fs = get_file_storage();
2091
2092         $groupmode = groups_get_activity_groupmode($this->get_course_module());
2093         // All users.
2094         $groupid = 0;
2095         $groupname = '';
2096         if ($groupmode) {
2097             $groupid = groups_get_activity_group($this->get_course_module(), true);
2098             $groupname = groups_get_group_name($groupid).'-';
2099         }
2100
2101         // Construct the zip file name.
2102         $filename = clean_filename($this->get_course()->shortname . '-' .
2103                                    $this->get_instance()->name . '-' .
2104                                    $groupname.$this->get_course_module()->id . '.zip');
2105
2106         // Get all the files for each student.
2107         foreach ($students as $student) {
2108             $userid = $student->id;
2109
2110             if ((groups_is_member($groupid, $userid) or !$groupmode or !$groupid)) {
2111                 // Get the plugins to add their own files to the zip.
2112
2113                 $submissiongroup = false;
2114                 $groupname = '';
2115                 if ($this->get_instance()->teamsubmission) {
2116                     $submission = $this->get_group_submission($userid, 0, false);
2117                     $submissiongroup = $this->get_submission_group($userid);
2118                     if ($submissiongroup) {
2119                         $groupname = $submissiongroup->name . '-';
2120                     } else {
2121                         $groupname = get_string('defaultteam', 'assign') . '-';
2122                     }
2123                 } else {
2124                     $submission = $this->get_user_submission($userid, false);
2125                 }
2126
2127                 if ($this->is_blind_marking()) {
2128                     $prefix = str_replace('_', ' ', $groupname . get_string('participant', 'assign'));
2129                     $prefix = clean_filename($prefix . '_' . $this->get_uniqueid_for_user($userid) . '_');
2130                 } else {
2131                     $prefix = str_replace('_', ' ', $groupname . fullname($student));
2132                     $prefix = clean_filename($prefix . '_' . $this->get_uniqueid_for_user($userid) . '_');
2133                 }
2134
2135                 if ($submission) {
2136                     foreach ($this->submissionplugins as $plugin) {
2137                         if ($plugin->is_enabled() && $plugin->is_visible()) {
2138                             $pluginfiles = $plugin->get_files($submission, $student);
2139                             foreach ($pluginfiles as $zipfilename => $file) {
2140                                 $subtype = $plugin->get_subtype();
2141                                 $type = $plugin->get_type();
2142                                 $prefixedfilename = clean_filename($prefix .
2143                                                                    $subtype .
2144                                                                    '_' .
2145                                                                    $type .
2146                                                                    '_' .
2147                                                                    $zipfilename);
2148                                 $filesforzipping[$prefixedfilename] = $file;
2149                             }
2150                         }
2151                     }
2152                 }
2153             }
2154         }
2155         $result = '';
2156         if (count($filesforzipping) == 0) {
2157             $header = new assign_header($this->get_instance(),
2158                                         $this->get_context(),
2159                                         '',
2160                                         $this->get_course_module()->id,
2161                                         get_string('downloadall', 'assign'));
2162             $result .= $this->get_renderer()->render($header);
2163             $result .= $this->get_renderer()->notification(get_string('nosubmission', 'assign'));
2164             $url = new moodle_url('/mod/assign/view.php', array('id'=>$this->get_course_module()->id,
2165                                                                     'action'=>'grading'));
2166             $result .= $this->get_renderer()->continue_button($url);
2167             $result .= $this->view_footer();
2168         } else if ($zipfile = $this->pack_files($filesforzipping)) {
2169             $this->add_to_log('download all submissions', get_string('downloadall', 'assign'));
2170             // Send file and delete after sending.
2171             send_temp_file($zipfile, $filename);
2172             // We will not get here - send_temp_file calls exit.
2173         }
2174         return $result;
2175     }
2176
2177     /**
2178      * Util function to add a message to the log.
2179      *
2180      * @param string $action The current action
2181      * @param string $info A detailed description of the change. But no more than 255 characters.
2182      * @param string $url The url to the assign module instance.
2183      * @return void
2184      */
2185     public function add_to_log($action = '', $info = '', $url='') {
2186         global $USER;
2187
2188         $fullurl = 'view.php?id=' . $this->get_course_module()->id;
2189         if ($url != '') {
2190             $fullurl .= '&' . $url;
2191         }
2192
2193         add_to_log($this->get_course()->id,
2194                    'assign',
2195                    $action,
2196                    $fullurl,
2197                    $info,
2198                    $this->get_course_module()->id,
2199                    $USER->id);
2200     }
2201
2202     /**
2203      * Lazy load the page renderer and expose the renderer to plugins.
2204      *
2205      * @return assign_renderer
2206      */
2207     public function get_renderer() {
2208         global $PAGE;
2209         if ($this->output) {
2210             return $this->output;
2211         }
2212         $this->output = $PAGE->get_renderer('mod_assign');
2213         return $this->output;
2214     }
2215
2216     /**
2217      * Load the submission object for a particular user, optionally creating it if required.
2218      *
2219      * For team assignments there are 2 submissions - the student submission and the team submission
2220      * All files are associated with the team submission but the status of the students contribution is
2221      * recorded separately.
2222      *
2223      * @param int $userid The id of the user whose submission we want or 0 in which case USER->id is used
2224      * @param bool $create optional - defaults to false. If set to true a new submission object
2225      *                     will be created in the database.
2226      * @return stdClass The submission
2227      */
2228     public function get_user_submission($userid, $create) {
2229         global $DB, $USER;
2230
2231         if (!$userid) {
2232             $userid = $USER->id;
2233         }
2234         // If the userid is not null then use userid.
2235         $params = array('assignment'=>$this->get_instance()->id, 'userid'=>$userid, 'groupid'=>0);
2236         $submission = $DB->get_record('assign_submission', $params);
2237
2238         if ($submission) {
2239             return $submission;
2240         }
2241         if ($create) {
2242             $submission = new stdClass();
2243             $submission->assignment   = $this->get_instance()->id;
2244             $submission->userid       = $userid;
2245             $submission->timecreated = time();
2246             $submission->timemodified = $submission->timecreated;
2247             $submission->status = ASSIGN_SUBMISSION_STATUS_DRAFT;
2248             $sid = $DB->insert_record('assign_submission', $submission);
2249             $submission->id = $sid;
2250             return $submission;
2251         }
2252         return false;
2253     }
2254
2255     /**
2256      * Load the submission object from it's id.
2257      *
2258      * @param int $submissionid The id of the submission we want
2259      * @return stdClass The submission
2260      */
2261     protected function get_submission($submissionid) {
2262         global $DB;
2263
2264         $params = array('assignment'=>$this->get_instance()->id, 'id'=>$submissionid);
2265         return $DB->get_record('assign_submission', $params, '*', MUST_EXIST);
2266     }
2267
2268     /**
2269      * This will retrieve a grade object from the db, optionally creating it if required.
2270      *
2271      * @param int $userid The user we are grading
2272      * @param bool $create If true the grade will be created if it does not exist
2273      * @return stdClass The grade record
2274      */
2275     public function get_user_grade($userid, $create) {
2276         global $DB, $USER;
2277
2278         if (!$userid) {
2279             $userid = $USER->id;
2280         }
2281
2282         // If the userid is not null then use userid.
2283         $grade = $DB->get_record('assign_grades', array('assignment'=>$this->get_instance()->id, 'userid'=>$userid));
2284
2285         if ($grade) {
2286             return $grade;
2287         }
2288         if ($create) {
2289             $grade = new stdClass();
2290             $grade->assignment   = $this->get_instance()->id;
2291             $grade->userid       = $userid;
2292             $grade->timecreated = time();
2293             $grade->timemodified = $grade->timecreated;
2294             $grade->locked = 0;
2295             $grade->grade = -1;
2296             $grade->grader = $USER->id;
2297             $grade->extensionduedate = 0;
2298
2299             // The mailed flag can be one of 3 values: 0 is unsent, 1 is sent and 2 is do not send yet.
2300             // This is because students only want to be notified about certain types of update (grades and feedback).
2301             $grade->mailed = 2;
2302             $gid = $DB->insert_record('assign_grades', $grade);
2303             $grade->id = $gid;
2304             return $grade;
2305         }
2306         return false;
2307     }
2308
2309     /**
2310      * This will retrieve a grade object from the db.
2311      *
2312      * @param int $gradeid The id of the grade
2313      * @return stdClass The grade record
2314      */
2315     protected function get_grade($gradeid) {
2316         global $DB;
2317
2318         $params = array('assignment'=>$this->get_instance()->id, 'id'=>$gradeid);
2319         return $DB->get_record('assign_grades', $params, '*', MUST_EXIST);
2320     }
2321
2322     /**
2323      * Print the grading page for a single user submission.
2324      *
2325      * @param moodleform $mform
2326      * @param int $offset
2327      * @return string
2328      */
2329     protected function view_single_grade_page($mform, $offset=0) {
2330         global $DB, $CFG;
2331
2332         $o = '';
2333         $instance = $this->get_instance();
2334
2335         require_once($CFG->dirroot . '/mod/assign/gradeform.php');
2336
2337         // Need submit permission to submit an assignment.
2338         require_capability('mod/assign:grade', $this->context);
2339
2340         $header = new assign_header($instance,
2341                                     $this->get_context(),
2342                                     false,
2343                                     $this->get_course_module()->id,
2344                                     get_string('grading', 'assign'));
2345         $o .= $this->get_renderer()->render($header);
2346
2347         $rownum = required_param('rownum', PARAM_INT) + $offset;
2348         $useridlist = optional_param('useridlist', '', PARAM_TEXT);
2349         if ($useridlist) {
2350             $useridlist = explode(',', $useridlist);
2351         } else {
2352             $useridlist = $this->get_grading_userid_list();
2353         }
2354         $last = false;
2355         $userid = $useridlist[$rownum];
2356         if ($rownum == count($useridlist) - 1) {
2357             $last = true;
2358         }
2359         if (!$userid) {
2360             throw new coding_exception('Row is out of bounds for the current grading table: ' . $rownum);
2361         }
2362         $user = $DB->get_record('user', array('id' => $userid));
2363         if ($user) {
2364             $viewfullnames = has_capability('moodle/site:viewfullnames', $this->get_course_context());
2365             $usersummary = new assign_user_summary($user,
2366                                                    $this->get_course()->id,
2367                                                    $viewfullnames,
2368                                                    $this->is_blind_marking(),
2369                                                    $this->get_uniqueid_for_user($user->id));
2370             $o .= $this->get_renderer()->render($usersummary);
2371         }
2372         $submission = $this->get_user_submission($userid, false);
2373         $submissiongroup = null;
2374         $submissiongroupmemberswhohavenotsubmitted = array();
2375         $teamsubmission = null;
2376         $notsubmitted = array();
2377         if ($instance->teamsubmission) {
2378             $teamsubmission = $this->get_group_submission($userid, 0, false);
2379             $submissiongroup = $this->get_submission_group($userid);
2380             $groupid = 0;
2381             if ($submissiongroup) {
2382                 $groupid = $submissiongroup->id;
2383             }
2384             $notsubmitted = $this->get_submission_group_members_who_have_not_submitted($groupid, false);
2385
2386         }
2387
2388         // Get the current grade.
2389         $grade = $this->get_user_grade($userid, false);
2390         if ($this->can_view_submission($userid)) {
2391             $gradelocked = ($grade && $grade->locked) || $this->grading_disabled($userid);
2392             $extensionduedate = null;
2393             if ($grade) {
2394                 $extensionduedate = $grade->extensionduedate;
2395             }
2396             $showedit = $this->submissions_open($userid) && ($this->is_any_submission_plugin_enabled());
2397
2398             if ($teamsubmission) {
2399                 $showsubmit = $showedit &&
2400                               $teamsubmission &&
2401                               ($teamsubmission->status == ASSIGN_SUBMISSION_STATUS_DRAFT);
2402             } else {
2403                 $showsubmit = $showedit &&
2404                               $submission &&
2405                               ($submission->status == ASSIGN_SUBMISSION_STATUS_DRAFT);
2406             }
2407             if (!$this->get_instance()->submissiondrafts) {
2408                 $showsubmit = false;
2409             }
2410             $viewfullnames = has_capability('moodle/site:viewfullnames', $this->get_course_context());
2411
2412             $submissionstatus = new assign_submission_status($instance->allowsubmissionsfromdate,
2413                                                              $instance->alwaysshowdescription,
2414                                                              $submission,
2415                                                              $instance->teamsubmission,
2416                                                              $teamsubmission,
2417                                                              $submissiongroup,
2418                                                              $notsubmitted,
2419                                                              $this->is_any_submission_plugin_enabled(),
2420                                                              $gradelocked,
2421                                                              $this->is_graded($userid),
2422                                                              $instance->duedate,
2423                                                              $instance->cutoffdate,
2424                                                              $this->get_submission_plugins(),
2425                                                              $this->get_return_action(),
2426                                                              $this->get_return_params(),
2427                                                              $this->get_course_module()->id,
2428                                                              $this->get_course()->id,
2429                                                              assign_submission_status::GRADER_VIEW,
2430                                                              $showedit,
2431                                                              $showsubmit,
2432                                                              $viewfullnames,
2433                                                              $extensionduedate,
2434                                                              $this->get_context(),
2435                                                              $this->is_blind_marking(),
2436                                                              '');
2437             $o .= $this->get_renderer()->render($submissionstatus);
2438         }
2439         if ($grade) {
2440             $data = new stdClass();
2441             if ($grade->grade !== null && $grade->grade >= 0) {
2442                 $data->grade = format_float($grade->grade, 2);
2443             }
2444         } else {
2445             $data = new stdClass();
2446             $data->grade = '';
2447         }
2448
2449         // Now show the grading form.
2450         if (!$mform) {
2451             $pagination = array( 'rownum'=>$rownum, 'useridlist'=>$useridlist, 'last'=>$last);
2452             $formparams = array($this, $data, $pagination);
2453             $mform = new mod_assign_grade_form(null,
2454                                                $formparams,
2455                                                'post',
2456                                                '',
2457                                                array('class'=>'gradeform'));
2458         }
2459         $o .= $this->get_renderer()->render(new assign_form('gradingform', $mform));
2460
2461         $msg = get_string('viewgradingformforstudent',
2462                           'assign',
2463                           array('id'=>$user->id, 'fullname'=>fullname($user)));
2464         $this->add_to_log('view grading form', $msg);
2465
2466         $o .= $this->view_footer();
2467         return $o;
2468     }
2469
2470     /**
2471      * Show a confirmation page to make sure they want to release student identities.
2472      *
2473      * @return string
2474      */
2475     protected function view_reveal_identities_confirm() {
2476         global $CFG, $USER;
2477
2478         require_capability('mod/assign:revealidentities', $this->get_context());
2479
2480         $o = '';
2481         $header = new assign_header($this->get_instance(),
2482                                     $this->get_context(),
2483                                     false,
2484                                     $this->get_course_module()->id);
2485         $o .= $this->get_renderer()->render($header);
2486
2487         $urlparams = array('id'=>$this->get_course_module()->id,
2488                            'action'=>'revealidentitiesconfirm',
2489                            'sesskey'=>sesskey());
2490         $confirmurl = new moodle_url('/mod/assign/view.php', $urlparams);
2491
2492         $urlparams = array('id'=>$this->get_course_module()->id,
2493                            'action'=>'grading');
2494         $cancelurl = new moodle_url('/mod/assign/view.php', $urlparams);
2495
2496         $o .= $this->get_renderer()->confirm(get_string('revealidentitiesconfirm', 'assign'),
2497                                              $confirmurl,
2498                                              $cancelurl);
2499         $o .= $this->view_footer();
2500         $this->add_to_log('view', get_string('viewrevealidentitiesconfirm', 'assign'));
2501         return $o;
2502     }
2503
2504     /**
2505      * View a link to go back to the previous page. Uses url parameters returnaction and returnparams.
2506      *
2507      * @return string
2508      */
2509     protected function view_return_links() {
2510         $returnaction = optional_param('returnaction', '', PARAM_ALPHA);
2511         $returnparams = optional_param('returnparams', '', PARAM_TEXT);
2512
2513         $params = array();
2514         parse_str($returnparams, $params);
2515         $newparams = array('id' => $this->get_course_module()->id, 'action' => $returnaction);
2516         $params = array_merge($newparams, $params);
2517
2518         $url = new moodle_url('/mod/assign/view.php', $params);
2519         return $this->get_renderer()->single_button($url, get_string('back'), 'get');
2520     }
2521
2522     /**
2523      * View the grading table of all submissions for this assignment.
2524      *
2525      * @return string
2526      */
2527     protected function view_grading_table() {
2528         global $USER, $CFG;
2529
2530         // Include grading options form.
2531         require_once($CFG->dirroot . '/mod/assign/gradingoptionsform.php');
2532         require_once($CFG->dirroot . '/mod/assign/quickgradingform.php');
2533         require_once($CFG->dirroot . '/mod/assign/gradingbatchoperationsform.php');
2534         $o = '';
2535         $cmid = $this->get_course_module()->id;
2536
2537         $links = array();
2538         if (has_capability('gradereport/grader:view', $this->get_course_context()) &&
2539                 has_capability('moodle/grade:viewall', $this->get_course_context())) {
2540             $gradebookurl = '/grade/report/grader/index.php?id=' . $this->get_course()->id;
2541             $links[$gradebookurl] = get_string('viewgradebook', 'assign');
2542         }
2543         if ($this->is_any_submission_plugin_enabled()) {
2544             $downloadurl = '/mod/assign/view.php?id=' . $cmid . '&action=downloadall';
2545             $links[$downloadurl] = get_string('downloadall', 'assign');
2546         }
2547         if ($this->is_blind_marking() &&
2548                 has_capability('mod/assign:revealidentities', $this->get_context())) {
2549             $revealidentitiesurl = '/mod/assign/view.php?id=' . $cmid . '&action=revealidentities';
2550             $links[$revealidentitiesurl] = get_string('revealidentities', 'assign');
2551         }
2552         foreach ($this->get_feedback_plugins() as $plugin) {
2553             if ($plugin->is_enabled() && $plugin->is_visible()) {
2554                 foreach ($plugin->get_grading_actions() as $action => $description) {
2555                     $url = '/mod/assign/view.php' .
2556                            '?id=' .  $cmid .
2557                            '&plugin=' . $plugin->get_type() .
2558                            '&pluginsubtype=assignfeedback' .
2559                            '&action=viewpluginpage&pluginaction=' . $action;
2560                     $links[$url] = $description;
2561                 }
2562             }
2563         }
2564
2565         $gradingactions = new url_select($links);
2566         $gradingactions->set_label(get_string('choosegradingaction', 'assign'));
2567
2568         $gradingmanager = get_grading_manager($this->get_context(), 'mod_assign', 'submissions');
2569
2570         $perpage = get_user_preferences('assign_perpage', 10);
2571         $filter = get_user_preferences('assign_filter', '');
2572         $controller = $gradingmanager->get_active_controller();
2573         $showquickgrading = empty($controller);
2574         if (optional_param('action', '', PARAM_ALPHA) == 'saveoptions') {
2575             $quickgrading = optional_param('quickgrading', false, PARAM_BOOL);
2576             set_user_preference('assign_quickgrading', $quickgrading);
2577         }
2578         $quickgrading = get_user_preferences('assign_quickgrading', false);
2579
2580         // Print options for changing the filter and changing the number of results per page.
2581         $gradingoptionsformparams = array('cm'=>$cmid,
2582                                           'contextid'=>$this->context->id,
2583                                           'userid'=>$USER->id,
2584                                           'submissionsenabled'=>$this->is_any_submission_plugin_enabled(),
2585                                           'showquickgrading'=>$showquickgrading,
2586                                           'quickgrading'=>$quickgrading);
2587
2588         $classoptions = array('class'=>'gradingoptionsform');
2589         $gradingoptionsform = new mod_assign_grading_options_form(null,
2590                                                                   $gradingoptionsformparams,
2591                                                                   'post',
2592                                                                   '',
2593                                                                   $classoptions);
2594
2595         $batchformparams = array('cm'=>$cmid,
2596                                  'submissiondrafts'=>$this->get_instance()->submissiondrafts,
2597                                  'duedate'=>$this->get_instance()->duedate,
2598                                  'feedbackplugins'=>$this->get_feedback_plugins());
2599         $classoptions = array('class'=>'gradingbatchoperationsform');
2600
2601         $gradingbatchoperationsform = new mod_assign_grading_batch_operations_form(null,
2602                                                                                    $batchformparams,
2603                                                                                    'post',
2604                                                                                    '',
2605                                                                                    $classoptions);
2606
2607         $gradingoptionsdata = new stdClass();
2608         $gradingoptionsdata->perpage = $perpage;
2609         $gradingoptionsdata->filter = $filter;
2610         $gradingoptionsform->set_data($gradingoptionsdata);
2611
2612         $actionformtext = $this->get_renderer()->render($gradingactions);
2613         $header = new assign_header($this->get_instance(),
2614                                     $this->get_context(),
2615                                     false,
2616                                     $this->get_course_module()->id,
2617                                     get_string('grading', 'assign'),
2618                                     $actionformtext);
2619         $o .= $this->get_renderer()->render($header);
2620
2621         $currenturl = $CFG->wwwroot .
2622                       '/mod/assign/view.php?id=' .
2623                       $this->get_course_module()->id .
2624                       '&action=grading';
2625
2626         $o .= groups_print_activity_menu($this->get_course_module(), $currenturl, true);
2627
2628         // Plagiarism update status apearring in the grading book.
2629         if (!empty($CFG->enableplagiarism)) {
2630             require_once($CFG->libdir . '/plagiarismlib.php');
2631             $o .= plagiarism_update_status($this->get_course(), $this->get_course_module());
2632         }
2633
2634         // Load and print the table of submissions.
2635         if ($showquickgrading && $quickgrading) {
2636             $gradingtable = new assign_grading_table($this, $perpage, $filter, 0, true);
2637             $table = $this->get_renderer()->render($gradingtable);
2638             $quickformparams = array('cm'=>$this->get_course_module()->id, 'gradingtable'=>$table);
2639             $quickgradingform = new mod_assign_quick_grading_form(null, $quickformparams);
2640
2641             $o .= $this->get_renderer()->render(new assign_form('quickgradingform', $quickgradingform));
2642         } else {
2643             $gradingtable = new assign_grading_table($this, $perpage, $filter, 0, false);
2644             $o .= $this->get_renderer()->render($gradingtable);
2645         }
2646
2647         $currentgroup = groups_get_activity_group($this->get_course_module(), true);
2648         $users = array_keys($this->list_participants($currentgroup, true));
2649         if (count($users) != 0) {
2650             // If no enrolled user in a course then don't display the batch operations feature.
2651             $assignform = new assign_form('gradingbatchoperationsform', $gradingbatchoperationsform);
2652             $o .= $this->get_renderer()->render($assignform);
2653         }
2654         $assignform = new assign_form('gradingoptionsform',
2655                                       $gradingoptionsform,
2656                                       'M.mod_assign.init_grading_options');
2657         $o .= $this->get_renderer()->render($assignform);
2658         return $o;
2659     }
2660
2661     /**
2662      * View entire grading page.
2663      *
2664      * @return string
2665      */
2666     protected function view_grading_page() {
2667         global $CFG;
2668
2669         $o = '';
2670         // Need submit permission to submit an assignment.
2671         require_capability('mod/assign:grade', $this->context);
2672         require_once($CFG->dirroot . '/mod/assign/gradeform.php');
2673
2674         // Only load this if it is.
2675
2676         $o .= $this->view_grading_table();
2677
2678         $o .= $this->view_footer();
2679
2680         $logmessage = get_string('viewsubmissiongradingtable', 'assign');
2681         $this->add_to_log('view submission grading table', $logmessage);
2682         return $o;
2683     }
2684
2685     /**
2686      * Capture the output of the plagiarism plugins disclosures and return it as a string.
2687      *
2688      * @return void
2689      */
2690     protected function plagiarism_print_disclosure() {
2691         global $CFG;
2692         $o = '';
2693
2694         if (!empty($CFG->enableplagiarism)) {
2695             require_once($CFG->libdir . '/plagiarismlib.php');
2696
2697             $o .= plagiarism_print_disclosure($this->get_course_module()->id);
2698         }
2699
2700         return $o;
2701     }
2702
2703     /**
2704      * Message for students when assignment submissions have been closed.
2705      *
2706      * @return string
2707      */
2708     protected function view_student_error_message() {
2709         global $CFG;
2710
2711         $o = '';
2712         // Need submit permission to submit an assignment.
2713         require_capability('mod/assign:submit', $this->context);
2714
2715         $header = new assign_header($this->get_instance(),
2716                                     $this->get_context(),
2717                                     $this->show_intro(),
2718                                     $this->get_course_module()->id,
2719                                     get_string('editsubmission', 'assign'));
2720         $o .= $this->get_renderer()->render($header);
2721
2722         $o .= $this->get_renderer()->notification(get_string('submissionsclosed', 'assign'));
2723
2724         $o .= $this->view_footer();
2725
2726         return $o;
2727
2728     }
2729
2730     /**
2731      * View edit submissions page.
2732      *
2733      * @param moodleform $mform
2734      * @param array $notices A list of notices to display at the top of the
2735      *                       edit submission form (e.g. from plugins).
2736      * @return void
2737      */
2738     protected function view_edit_submission_page($mform, $notices) {
2739         global $CFG;
2740
2741         $o = '';
2742         require_once($CFG->dirroot . '/mod/assign/submission_form.php');
2743         // Need submit permission to submit an assignment.
2744         require_capability('mod/assign:submit', $this->context);
2745
2746         if (!$this->submissions_open()) {
2747             return $this->view_student_error_message();
2748         }
2749         $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
2750                                                       $this->get_context(),
2751                                                       $this->show_intro(),
2752                                                       $this->get_course_module()->id,
2753                                                       get_string('editsubmission', 'assign')));
2754         $o .= $this->plagiarism_print_disclosure();
2755         $data = new stdClass();
2756
2757         if (!$mform) {
2758             $mform = new mod_assign_submission_form(null, array($this, $data));
2759         }
2760
2761         foreach ($notices as $notice) {
2762             $o .= $this->get_renderer()->notification($notice);
2763         }
2764
2765         $o .= $this->get_renderer()->render(new assign_form('editsubmissionform', $mform));
2766
2767         $o .= $this->view_footer();
2768         $this->add_to_log('view submit assignment form', get_string('viewownsubmissionform', 'assign'));
2769
2770         return $o;
2771     }
2772
2773     /**
2774      * See if this assignment has a grade yet.
2775      *
2776      * @param int $userid
2777      * @return bool
2778      */
2779     protected function is_graded($userid) {
2780         $grade = $this->get_user_grade($userid, false);
2781         if ($grade) {
2782             return ($grade->grade !== null && $grade->grade >= 0);
2783         }
2784         return false;
2785     }
2786
2787     /**
2788      * Perform an access check to see if the current $USER can view this users submission.
2789      *
2790      * @param int $userid
2791      * @return bool
2792      */
2793     public function can_view_submission($userid) {
2794         global $USER;
2795
2796         if (!is_enrolled($this->get_course_context(), $userid)) {
2797             return false;
2798         }
2799         if ($userid == $USER->id && has_capability('mod/assign:submit', $this->context)) {
2800             return true;
2801         }
2802         if (has_capability('mod/assign:grade', $this->context)) {
2803             return true;
2804         }
2805         return false;
2806     }
2807
2808     /**
2809      * Allows the plugin to show a batch grading operation page.
2810      *
2811      * @return none
2812      */
2813     protected function view_plugin_grading_batch_operation($mform) {
2814         require_capability('mod/assign:grade', $this->context);
2815         $prefix = 'plugingradingbatchoperation_';
2816
2817         if ($data = $mform->get_data()) {
2818             $tail = substr($data->operation, strlen($prefix));
2819             list($plugintype, $action) = explode('_', $tail, 2);
2820
2821             $plugin = $this->get_feedback_plugin_by_type($plugintype);
2822             if ($plugin) {
2823                 $users = $data->selectedusers;
2824                 $userlist = explode(',', $users);
2825                 echo $plugin->grading_batch_operation($action, $userlist);
2826                 return;
2827             }
2828         }
2829         print_error('invalidformdata', '');
2830     }
2831
2832     /**
2833      * Ask the user to confirm they want to perform this batch operation
2834      *
2835      * @param moodleform $mform Set to a grading batch operations form
2836      * @return string - the page to view after processing these actions
2837      */
2838     protected function process_grading_batch_operation(& $mform) {
2839         global $CFG;
2840         require_once($CFG->dirroot . '/mod/assign/gradingbatchoperationsform.php');
2841         require_sesskey();
2842
2843         $batchformparams = array('cm'=>$this->get_course_module()->id,
2844                                  'submissiondrafts'=>$this->get_instance()->submissiondrafts,
2845                                  'duedate'=>$this->get_instance()->duedate,
2846                                  'feedbackplugins'=>$this->get_feedback_plugins());
2847         $formclasses = array('class'=>'gradingbatchoperationsform');
2848         $mform = new mod_assign_grading_batch_operations_form(null,
2849                                                               $batchformparams,
2850                                                               'post',
2851                                                               '',
2852                                                               $formclasses);
2853
2854         if ($data = $mform->get_data()) {
2855             // Get the list of users.
2856             $users = $data->selectedusers;
2857             $userlist = explode(',', $users);
2858
2859             $prefix = 'plugingradingbatchoperation_';
2860
2861             if ($data->operation == 'grantextension') {
2862                 // Reset the form so the grant extension page will create the extension form.
2863                 $mform = null;
2864                 return 'grantextension';
2865             } else if (strpos($data->operation, $prefix) === 0) {
2866                 $tail = substr($data->operation, strlen($prefix));
2867                 list($plugintype, $action) = explode('_', $tail, 2);
2868
2869                 $plugin = $this->get_feedback_plugin_by_type($plugintype);
2870                 if ($plugin) {
2871                     return 'plugingradingbatchoperation';
2872                 }
2873             }
2874
2875             foreach ($userlist as $userid) {
2876                 if ($data->operation == 'lock') {
2877                     $this->process_lock($userid);
2878                 } else if ($data->operation == 'unlock') {
2879                     $this->process_unlock($userid);
2880                 } else if ($data->operation == 'reverttodraft') {
2881                     $this->process_revert_to_draft($userid);
2882                 }
2883             }
2884         }
2885
2886         return 'grading';
2887     }
2888
2889     /**
2890      * Ask the user to confirm they want to submit their work for grading.
2891      *
2892      * @param $mform moodleform - null unless form validation has failed
2893      * @return string
2894      */
2895     protected function check_submit_for_grading($mform) {
2896         global $USER, $CFG;
2897
2898         require_once($CFG->dirroot . '/mod/assign/submissionconfirmform.php');
2899
2900         // Check that all of the submission plugins are ready for this submission.
2901         $notifications = array();
2902         $submission = $this->get_user_submission($USER->id, false);
2903         $plugins = $this->get_submission_plugins();
2904         foreach ($plugins as $plugin) {
2905             if ($plugin->is_enabled() && $plugin->is_visible()) {
2906                 $check = $plugin->precheck_submission($submission);
2907                 if ($check !== true) {
2908                     $notifications[] = $check;
2909                 }
2910             }
2911         }
2912
2913         $data = new stdClass();
2914         $adminconfig = $this->get_admin_config();
2915         $requiresubmissionstatement = (!empty($adminconfig->requiresubmissionstatement) ||
2916                                        $this->get_instance()->requiresubmissionstatement) &&
2917                                        !empty($adminconfig->submissionstatement);
2918
2919         $submissionstatement = '';
2920         if (!empty($adminconfig->submissionstatement)) {
2921             $submissionstatement = $adminconfig->submissionstatement;
2922         }
2923
2924         if ($mform == null) {
2925             $mform = new mod_assign_confirm_submission_form(null, array($requiresubmissionstatement,
2926                                                                         $submissionstatement,
2927                                                                         $this->get_course_module()->id,
2928                                                                         $data));
2929         }
2930         $o = '';
2931         $o .= $this->get_renderer()->header();
2932         $submitforgradingpage = new assign_submit_for_grading_page($notifications,
2933                                                                    $this->get_course_module()->id,
2934                                                                    $mform);
2935         $o .= $this->get_renderer()->render($submitforgradingpage);
2936         $o .= $this->view_footer();
2937
2938         $logmessage = get_string('viewownsubmissionform', 'assign');
2939         $this->add_to_log('view confirm submit assignment form', $logmessage);
2940
2941         return $o;
2942     }
2943
2944     /**
2945      * Print 2 tables of information with no action links -
2946      * the submission summary and the grading summary.
2947      *
2948      * @param stdClass $user the user to print the report for
2949      * @param bool $showlinks - Return plain text or links to the profile
2950      * @return string - the html summary
2951      */
2952     public function view_student_summary($user, $showlinks) {
2953         global $CFG, $DB, $PAGE;
2954
2955         $instance = $this->get_instance();
2956         $grade = $this->get_user_grade($user->id, false);
2957         $submission = $this->get_user_submission($user->id, false);
2958         $o = '';
2959
2960         $teamsubmission = null;
2961         $submissiongroup = null;
2962         $notsubmitted = array();
2963         if ($instance->teamsubmission) {
2964             $teamsubmission = $this->get_group_submission($user->id, 0, false);
2965             $submissiongroup = $this->get_submission_group($user->id);
2966             $groupid = 0;
2967             if ($submissiongroup) {
2968                 $groupid = $submissiongroup->id;
2969             }
2970             $notsubmitted = $this->get_submission_group_members_who_have_not_submitted($groupid, false);
2971         }
2972
2973         if ($this->can_view_submission($user->id)) {
2974             $showedit = has_capability('mod/assign:submit', $this->context) &&
2975                         $this->submissions_open($user->id) &&
2976                         ($this->is_any_submission_plugin_enabled()) &&
2977                         $showlinks;
2978
2979             $gradelocked = ($grade && $grade->locked) || $this->grading_disabled($user->id);
2980
2981             // Grading criteria preview.
2982             $gradingmanager = get_grading_manager($this->context, 'mod_assign', 'submissions');
2983             $gradingcontrollerpreview = '';
2984             if ($gradingmethod = $gradingmanager->get_active_method()) {
2985                 $controller = $gradingmanager->get_controller($gradingmethod);
2986                 if ($controller->is_form_defined()) {
2987                     $gradingcontrollerpreview = $controller->render_preview($PAGE);
2988                 }
2989             }
2990
2991             $showsubmit = ($submission || $teamsubmission) && $showlinks;
2992             if ($teamsubmission && ($teamsubmission->status == ASSIGN_SUBMISSION_STATUS_SUBMITTED)) {
2993                 $showsubmit = false;
2994             }
2995             if ($submission && ($submission->status == ASSIGN_SUBMISSION_STATUS_SUBMITTED)) {
2996                 $showsubmit = false;
2997             }
2998             if (!$this->get_instance()->submissiondrafts) {
2999                 $showsubmit = false;
3000             }
3001             $extensionduedate = null;
3002             if ($grade) {
3003                 $extensionduedate = $grade->extensionduedate;
3004             }
3005             $viewfullnames = has_capability('moodle/site:viewfullnames', $this->get_course_context());
3006
3007             $submissionstatus = new assign_submission_status($instance->allowsubmissionsfromdate,
3008                                                               $instance->alwaysshowdescription,
3009                                                               $submission,
3010                                                               $instance->teamsubmission,
3011                                                               $teamsubmission,
3012                                                               $submissiongroup,
3013                                                               $notsubmitted,
3014                                                               $this->is_any_submission_plugin_enabled(),
3015                                                               $gradelocked,
3016                                                               $this->is_graded($user->id),
3017                                                               $instance->duedate,
3018                                                               $instance->cutoffdate,
3019                                                               $this->get_submission_plugins(),
3020                                                               $this->get_return_action(),
3021                                                               $this->get_return_params(),
3022                                                               $this->get_course_module()->id,
3023                                                               $this->get_course()->id,
3024                                                               assign_submission_status::STUDENT_VIEW,
3025                                                               $showedit,
3026                                                               $showsubmit,
3027                                                               $viewfullnames,
3028                                                               $extensionduedate,
3029                                                               $this->get_context(),
3030                                                               $this->is_blind_marking(),
3031                                                               $gradingcontrollerpreview);
3032             $o .= $this->get_renderer()->render($submissionstatus);
3033
3034             require_once($CFG->libdir.'/gradelib.php');
3035             require_once($CFG->dirroot.'/grade/grading/lib.php');
3036
3037             $gradinginfo = grade_get_grades($this->get_course()->id,
3038                                         'mod',
3039                                         'assign',
3040                                         $instance->id,
3041                                         $user->id);
3042
3043             $gradingitem = $gradinginfo->items[0];
3044             $gradebookgrade = $gradingitem->grades[$user->id];
3045
3046             // Check to see if all feedback plugins are empty.
3047             $emptyplugins = true;
3048             if ($grade) {
3049                 foreach ($this->get_feedback_plugins() as $plugin) {
3050                     if ($plugin->is_visible() && $plugin->is_enabled()) {
3051                         if (!$plugin->is_empty($grade)) {
3052                             $emptyplugins = false;
3053                         }
3054                     }
3055                 }
3056             }
3057
3058             if (!($gradebookgrade->hidden) && ($gradebookgrade->grade !== null || !$emptyplugins)) {
3059
3060                 $gradefordisplay = '';
3061                 $gradingmanager = get_grading_manager($this->get_context(), 'mod_assign', 'submissions');
3062
3063                 if ($controller = $gradingmanager->get_active_controller()) {
3064                     $controller->set_grade_range(make_grades_menu($this->get_instance()->grade));
3065                     $cangrade = has_capability('mod/assign:grade', $this->get_context());
3066                     $gradefordisplay = $controller->render_grade($PAGE,
3067                                                                  $grade->id,
3068                                                                  $gradingitem,
3069                                                                  $gradebookgrade->str_long_grade,
3070                                                                  $cangrade);
3071                 } else {
3072                     $gradefordisplay = $this->display_grade($gradebookgrade->grade, false);
3073                 }
3074
3075                 $gradeddate = $gradebookgrade->dategraded;
3076                 $grader = $DB->get_record('user', array('id'=>$grade->grader));
3077
3078                 $feedbackstatus = new assign_feedback_status($gradefordisplay,
3079                                                       $gradeddate,
3080                                                       $grader,
3081                                                       $this->get_feedback_plugins(),
3082                                                       $grade,
3083                                                       $this->get_course_module()->id,
3084                                                       $this->get_return_action(),
3085                                                       $this->get_return_params());
3086
3087                 $o .= $this->get_renderer()->render($feedbackstatus);
3088             }
3089
3090         }
3091         return $o;
3092     }
3093
3094     /**
3095      * View submissions page (contains details of current submission).
3096      *
3097      * @return string
3098      */
3099     protected function view_submission_page() {
3100         global $CFG, $DB, $USER, $PAGE;
3101
3102         $instance = $this->get_instance();
3103
3104         $o = '';
3105         $o .= $this->get_renderer()->render(new assign_header($instance,
3106                                                       $this->get_context(),
3107                                                       $this->show_intro(),
3108                                                       $this->get_course_module()->id));
3109
3110         if ($this->can_grade()) {
3111             $draft = ASSIGN_SUBMISSION_STATUS_DRAFT;
3112             $submitted = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
3113             if ($instance->teamsubmission) {
3114                 $summary = new assign_grading_summary($this->count_teams(),
3115                                                       $instance->submissiondrafts,
3116                                                       $this->count_submissions_with_status($draft),
3117                                                       $this->is_any_submission_plugin_enabled(),
3118                                                       $this->count_submissions_with_status($submitted),
3119                                                       $instance->cutoffdate,
3120                                                       $instance->duedate,
3121                                                       $this->get_course_module()->id,
3122                                                       $this->count_submissions_need_grading(),
3123                                                       $instance->teamsubmission);
3124                 $o .= $this->get_renderer()->render($summary);
3125             } else {
3126                 $summary = new assign_grading_summary($this->count_participants(0),
3127                                                       $instance->submissiondrafts,
3128                                                       $this->count_submissions_with_status($draft),
3129                                                       $this->is_any_submission_plugin_enabled(),
3130                                                       $this->count_submissions_with_status($submitted),
3131                                                       $instance->cutoffdate,
3132                                                       $instance->duedate,
3133                                                       $this->get_course_module()->id,
3134                                                       $this->count_submissions_need_grading(),
3135                                                       $instance->teamsubmission);
3136                 $o .= $this->get_renderer()->render($summary);
3137             }
3138         }
3139         $grade = $this->get_user_grade($USER->id, false);
3140         $submission = $this->get_user_submission($USER->id, false);
3141
3142         if ($this->can_view_submission($USER->id)) {
3143             $o .= $this->view_student_summary($USER, true);
3144         }
3145
3146         $o .= $this->view_footer();
3147         $this->add_to_log('view', get_string('viewownsubmissionstatus', 'assign'));
3148         return $o;
3149     }
3150
3151     /**
3152      * Convert the final raw grade(s) in the grading table for the gradebook.
3153      *
3154      * @param stdClass $grade
3155      * @return array
3156      */
3157     protected function convert_grade_for_gradebook(stdClass $grade) {
3158         $gradebookgrade = array();
3159         if ($grade->grade >= 0) {
3160             $gradebookgrade['rawgrade'] = $grade->grade;
3161         }
3162         $gradebookgrade['userid'] = $grade->userid;
3163         $gradebookgrade['usermodified'] = $grade->grader;
3164         $gradebookgrade['datesubmitted'] = null;
3165         $gradebookgrade['dategraded'] = $grade->timemodified;
3166         if (isset($grade->feedbackformat)) {
3167             $gradebookgrade['feedbackformat'] = $grade->feedbackformat;
3168         }
3169         if (isset($grade->feedbacktext)) {
3170             $gradebookgrade['feedback'] = $grade->feedbacktext;
3171         }
3172
3173         return $gradebookgrade;
3174     }
3175
3176     /**
3177      * Convert submission details for the gradebook.
3178      *
3179      * @param stdClass $submission
3180      * @return array
3181      */
3182     protected function convert_submission_for_gradebook(stdClass $submission) {
3183         $gradebookgrade = array();
3184
3185         $gradebookgrade['userid'] = $submission->userid;
3186         $gradebookgrade['usermodified'] = $submission->userid;
3187         $gradebookgrade['datesubmitted'] = $submission->timemodified;
3188
3189         return $gradebookgrade;
3190     }
3191
3192     /**
3193      * Update grades in the gradebook.
3194      *
3195      * @param mixed $submission stdClass|null
3196      * @param mixed $grade stdClass|null
3197      * @return bool
3198      */
3199     protected function gradebook_item_update($submission=null, $grade=null) {
3200
3201         // Do not push grade to gradebook if blind marking is active as
3202         // the gradebook would reveal the students.
3203         if ($this->is_blind_marking()) {
3204             return false;
3205         }
3206         if ($submission != null) {
3207             if ($submission->userid == 0) {
3208                 // This is a group submission update.
3209                 $team = groups_get_members($submission->groupid, 'u.id');
3210
3211                 foreach ($team as $member) {
3212                     $submission->groupid = 0;
3213                     $submission->userid = $member->id;
3214                     $this->gradebook_item_update($submission, null);
3215                 }
3216                 return;
3217             }
3218
3219             $gradebookgrade = $this->convert_submission_for_gradebook($submission);
3220
3221         } else {
3222             $gradebookgrade = $this->convert_grade_for_gradebook($grade);
3223         }
3224         // Grading is disabled, return.
3225         if ($this->grading_disabled($gradebookgrade['userid'])) {
3226             return false;
3227         }
3228         $assign = clone $this->get_instance();
3229         $assign->cmidnumber = $this->get_course_module()->id;
3230
3231         return assign_grade_item_update($assign, $gradebookgrade);
3232     }
3233
3234     /**
3235      * Update team submission.
3236      *