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Differences Between: [Versions 310 and 401] [Versions 311 and 401] [Versions 39 and 401] [Versions 400 and 401] [Versions 401 and 402] [Versions 401 and 403]

   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   * Manual enrolment plugin main library file.
  19   *
  20   * @package    enrol_manual
  21   * @copyright  2010 Petr Skoda {@link http://skodak.org}
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  defined('MOODLE_INTERNAL') || die();
  26  
  27  class enrol_manual_plugin extends enrol_plugin {
  28  
  29      protected $lasternoller = null;
  30      protected $lasternollerinstanceid = 0;
  31  
  32      public function roles_protected() {
  33          // Users may tweak the roles later.
  34          return false;
  35      }
  36  
  37      public function allow_enrol(stdClass $instance) {
  38          // Users with enrol cap may unenrol other users manually manually.
  39          return true;
  40      }
  41  
  42      public function allow_unenrol(stdClass $instance) {
  43          // Users with unenrol cap may unenrol other users manually manually.
  44          return true;
  45      }
  46  
  47      public function allow_manage(stdClass $instance) {
  48          // Users with manage cap may tweak period and status.
  49          return true;
  50      }
  51  
  52      /**
  53       * Returns link to manual enrol UI if exists.
  54       * Does the access control tests automatically.
  55       *
  56       * @param stdClass $instance
  57       * @return moodle_url
  58       */
  59      public function get_manual_enrol_link($instance) {
  60          $name = $this->get_name();
  61          if ($instance->enrol !== $name) {
  62              throw new coding_exception('invalid enrol instance!');
  63          }
  64  
  65          if (!enrol_is_enabled($name)) {
  66              return NULL;
  67          }
  68  
  69          $context = context_course::instance($instance->courseid, MUST_EXIST);
  70  
  71          if (!has_capability('enrol/manual:enrol', $context)) {
  72              // Note: manage capability not used here because it is used for editing
  73              // of existing enrolments which is not possible here.
  74              return NULL;
  75          }
  76  
  77          return new moodle_url('/enrol/manual/manage.php', array('enrolid'=>$instance->id, 'id'=>$instance->courseid));
  78      }
  79  
  80      /**
  81       * Return true if we can add a new instance to this course.
  82       *
  83       * @param int $courseid
  84       * @return boolean
  85       */
  86      public function can_add_instance($courseid) {
  87          global $DB;
  88  
  89          $context = context_course::instance($courseid, MUST_EXIST);
  90          if (!has_capability('moodle/course:enrolconfig', $context) or !has_capability('enrol/manual:config', $context)) {
  91              return false;
  92          }
  93  
  94          if ($DB->record_exists('enrol', array('courseid'=>$courseid, 'enrol'=>'manual'))) {
  95              // Multiple instances not supported.
  96              return false;
  97          }
  98  
  99          return true;
 100      }
 101  
 102      /**
 103       * Returns edit icons for the page with list of instances.
 104       * @param stdClass $instance
 105       * @return array
 106       */
 107      public function get_action_icons(stdClass $instance) {
 108          global $OUTPUT;
 109  
 110          $context = context_course::instance($instance->courseid);
 111  
 112          $icons = array();
 113          if (has_capability('enrol/manual:enrol', $context) or has_capability('enrol/manual:unenrol', $context)) {
 114              $managelink = new moodle_url("/enrol/manual/manage.php", array('enrolid'=>$instance->id));
 115              $icons[] = $OUTPUT->action_icon($managelink, new pix_icon('t/enrolusers', get_string('enrolusers', 'enrol_manual'), 'core', array('class'=>'iconsmall')));
 116          }
 117          $parenticons = parent::get_action_icons($instance);
 118          $icons = array_merge($icons, $parenticons);
 119  
 120          return $icons;
 121      }
 122  
 123      /**
 124       * Add new instance of enrol plugin with default settings.
 125       * @param stdClass $course
 126       * @return int id of new instance, null if can not be created
 127       */
 128      public function add_default_instance($course) {
 129          $expirynotify = $this->get_config('expirynotify', 0);
 130  
 131          $fields = array(
 132              'status'          => $this->get_config('status'),
 133              'roleid'          => $this->get_config('roleid', 0),
 134              'enrolperiod'     => $this->get_config('enrolperiod', 0),
 135              'expirynotify'    => $expirynotify,
 136              'notifyall'       => $expirynotify == 2 ? 1 : 0,
 137              'expirythreshold' => $this->get_config('expirythreshold', 86400),
 138          );
 139          return $this->add_instance($course, $fields);
 140      }
 141  
 142      /**
 143       * Add new instance of enrol plugin.
 144       * @param stdClass $course
 145       * @param array instance fields
 146       * @return int id of new instance, null if can not be created
 147       */
 148      public function add_instance($course, array $fields = NULL) {
 149          global $DB;
 150  
 151          if ($DB->record_exists('enrol', array('courseid'=>$course->id, 'enrol'=>'manual'))) {
 152              // only one instance allowed, sorry
 153              return NULL;
 154          }
 155  
 156          return parent::add_instance($course, $fields);
 157      }
 158  
 159      /**
 160       * Update instance of enrol plugin.
 161       * @param stdClass $instance
 162       * @param stdClass $data modified instance fields
 163       * @return boolean
 164       */
 165      public function update_instance($instance, $data) {
 166          global $DB;
 167  
 168          // Delete all other instances, leaving only one.
 169          if ($instances = $DB->get_records('enrol', array('courseid' => $instance->courseid, 'enrol' => 'manual'), 'id ASC')) {
 170              foreach ($instances as $anotherinstance) {
 171                  if ($anotherinstance->id != $instance->id) {
 172                      $this->delete_instance($anotherinstance);
 173                  }
 174              }
 175          }
 176  
 177          $data->notifyall = $data->expirynotify == 2 ? 1 : 0;
 178  
 179          return parent::update_instance($instance, $data);
 180      }
 181  
 182      /**
 183       * Returns a button to manually enrol users through the manual enrolment plugin.
 184       *
 185       * By default the first manual enrolment plugin instance available in the course is used.
 186       * If no manual enrolment instances exist within the course then false is returned.
 187       *
 188       * This function also adds a quickenrolment JS ui to the page so that users can be enrolled
 189       * via AJAX.
 190       *
 191       * @param course_enrolment_manager $manager
 192       * @return enrol_user_button
 193       */
 194      public function get_manual_enrol_button(course_enrolment_manager $manager) {
 195          global $CFG, $PAGE;
 196          require_once($CFG->dirroot.'/cohort/lib.php');
 197  
 198          static $called = false;
 199  
 200          $instance = null;
 201          foreach ($manager->get_enrolment_instances() as $tempinstance) {
 202              if ($tempinstance->enrol == 'manual') {
 203                  if ($instance === null) {
 204                      $instance = $tempinstance;
 205                  }
 206              }
 207          }
 208          if (empty($instance)) {
 209              return false;
 210          }
 211  
 212          $link = $this->get_manual_enrol_link($instance);
 213          if (!$link) {
 214              return false;
 215          }
 216  
 217          $button = new enrol_user_button($link, get_string('enrolusers', 'enrol_manual'), 'get');
 218          $button->class .= ' enrol_manual_plugin';
 219          $button->primary = true;
 220  
 221          $context = context_course::instance($instance->courseid);
 222          $arguments = array('contextid' => $context->id);
 223  
 224          if (!$called) {
 225              $called = true;
 226              // Calling the following more than once will cause unexpected results.
 227              $PAGE->requires->js_call_amd('enrol_manual/quickenrolment', 'init', array($arguments));
 228          }
 229  
 230          return $button;
 231      }
 232  
 233      /**
 234       * Sync all meta course links.
 235       *
 236       * @param progress_trace $trace
 237       * @param int $courseid one course, empty mean all
 238       * @return int 0 means ok, 1 means error, 2 means plugin disabled
 239       */
 240      public function sync(progress_trace $trace, $courseid = null) {
 241          global $DB;
 242  
 243          if (!enrol_is_enabled('manual')) {
 244              $trace->finished();
 245              return 2;
 246          }
 247  
 248          // Unfortunately this may take a long time, execution can be interrupted safely here.
 249          core_php_time_limit::raise();
 250          raise_memory_limit(MEMORY_HUGE);
 251  
 252          $trace->output('Verifying manual enrolment expiration...');
 253  
 254          $params = array('now'=>time(), 'useractive'=>ENROL_USER_ACTIVE, 'courselevel'=>CONTEXT_COURSE);
 255          $coursesql = "";
 256          if ($courseid) {
 257              $coursesql = "AND e.courseid = :courseid";
 258              $params['courseid'] = $courseid;
 259          }
 260  
 261          // Deal with expired accounts.
 262          $action = $this->get_config('expiredaction', ENROL_EXT_REMOVED_KEEP);
 263  
 264          if ($action == ENROL_EXT_REMOVED_UNENROL) {
 265              $instances = array();
 266              $sql = "SELECT ue.*, e.courseid, c.id AS contextid
 267                        FROM {user_enrolments} ue
 268                        JOIN {enrol} e ON (e.id = ue.enrolid AND e.enrol = 'manual')
 269                        JOIN {context} c ON (c.instanceid = e.courseid AND c.contextlevel = :courselevel)
 270                       WHERE ue.timeend > 0 AND ue.timeend < :now
 271                             $coursesql";
 272              $rs = $DB->get_recordset_sql($sql, $params);
 273              foreach ($rs as $ue) {
 274                  if (empty($instances[$ue->enrolid])) {
 275                      $instances[$ue->enrolid] = $DB->get_record('enrol', array('id'=>$ue->enrolid));
 276                  }
 277                  $instance = $instances[$ue->enrolid];
 278                  // Always remove all manually assigned roles here, this may break enrol_self roles but we do not want hardcoded hacks here.
 279                  role_unassign_all(array('userid'=>$ue->userid, 'contextid'=>$ue->contextid, 'component'=>'', 'itemid'=>0), true);
 280                  $this->unenrol_user($instance, $ue->userid);
 281                  $trace->output("unenrolling expired user $ue->userid from course $instance->courseid", 1);
 282              }
 283              $rs->close();
 284              unset($instances);
 285  
 286          } else if ($action == ENROL_EXT_REMOVED_SUSPENDNOROLES or $action == ENROL_EXT_REMOVED_SUSPEND) {
 287              $instances = array();
 288              $sql = "SELECT ue.*, e.courseid, c.id AS contextid
 289                        FROM {user_enrolments} ue
 290                        JOIN {enrol} e ON (e.id = ue.enrolid AND e.enrol = 'manual')
 291                        JOIN {context} c ON (c.instanceid = e.courseid AND c.contextlevel = :courselevel)
 292                       WHERE ue.timeend > 0 AND ue.timeend < :now
 293                             AND ue.status = :useractive
 294                             $coursesql";
 295              $rs = $DB->get_recordset_sql($sql, $params);
 296              foreach ($rs as $ue) {
 297                  if (empty($instances[$ue->enrolid])) {
 298                      $instances[$ue->enrolid] = $DB->get_record('enrol', array('id'=>$ue->enrolid));
 299                  }
 300                  $instance = $instances[$ue->enrolid];
 301                  if ($action == ENROL_EXT_REMOVED_SUSPENDNOROLES) {
 302                      // Remove all manually assigned roles here, this may break enrol_self roles but we do not want hardcoded hacks here.
 303                      role_unassign_all(array('userid'=>$ue->userid, 'contextid'=>$ue->contextid, 'component'=>'', 'itemid'=>0), true);
 304                      $this->update_user_enrol($instance, $ue->userid, ENROL_USER_SUSPENDED);
 305                      $trace->output("suspending expired user $ue->userid in course $instance->courseid, roles unassigned", 1);
 306                  } else {
 307                      $this->update_user_enrol($instance, $ue->userid, ENROL_USER_SUSPENDED);
 308                      $trace->output("suspending expired user $ue->userid in course $instance->courseid, roles kept", 1);
 309                  }
 310              }
 311              $rs->close();
 312              unset($instances);
 313  
 314          } else {
 315              // ENROL_EXT_REMOVED_KEEP means no changes.
 316          }
 317  
 318          $trace->output('...manual enrolment updates finished.');
 319          $trace->finished();
 320  
 321          return 0;
 322      }
 323  
 324      /**
 325       * Returns the user who is responsible for manual enrolments in given instance.
 326       *
 327       * Usually it is the first editing teacher - the person with "highest authority"
 328       * as defined by sort_by_roleassignment_authority() having 'enrol/manual:manage'
 329       * capability.
 330       *
 331       * @param int $instanceid enrolment instance id
 332       * @return stdClass user record
 333       */
 334      protected function get_enroller($instanceid) {
 335          global $DB;
 336  
 337          if ($this->lasternollerinstanceid == $instanceid and $this->lasternoller) {
 338              return $this->lasternoller;
 339          }
 340  
 341          $instance = $DB->get_record('enrol', array('id'=>$instanceid, 'enrol'=>$this->get_name()), '*', MUST_EXIST);
 342          $context = context_course::instance($instance->courseid);
 343  
 344          if ($users = get_enrolled_users($context, 'enrol/manual:manage')) {
 345              $users = sort_by_roleassignment_authority($users, $context);
 346              $this->lasternoller = reset($users);
 347              unset($users);
 348          } else {
 349              $this->lasternoller = parent::get_enroller($instanceid);
 350          }
 351  
 352          $this->lasternollerinstanceid = $instanceid;
 353  
 354          return $this->lasternoller;
 355      }
 356  
 357      /**
 358       * The manual plugin has several bulk operations that can be performed.
 359       * @param course_enrolment_manager $manager
 360       * @return array
 361       */
 362      public function get_bulk_operations(course_enrolment_manager $manager) {
 363          global $CFG;
 364          require_once($CFG->dirroot.'/enrol/manual/locallib.php');
 365          $context = $manager->get_context();
 366          $bulkoperations = array();
 367          if (has_capability("enrol/manual:manage", $context)) {
 368              $bulkoperations['editselectedusers'] = new enrol_manual_editselectedusers_operation($manager, $this);
 369          }
 370          if (has_capability("enrol/manual:unenrol", $context)) {
 371              $bulkoperations['deleteselectedusers'] = new enrol_manual_deleteselectedusers_operation($manager, $this);
 372          }
 373          return $bulkoperations;
 374      }
 375  
 376      /**
 377       * Restore instance and map settings.
 378       *
 379       * @param restore_enrolments_structure_step $step
 380       * @param stdClass $data
 381       * @param stdClass $course
 382       * @param int $oldid
 383       */
 384      public function restore_instance(restore_enrolments_structure_step $step, stdClass $data, $course, $oldid) {
 385          global $DB;
 386          // There is only I manual enrol instance allowed per course.
 387          if ($instances = $DB->get_records('enrol', array('courseid'=>$data->courseid, 'enrol'=>'manual'), 'id')) {
 388              $instance = reset($instances);
 389              $instanceid = $instance->id;
 390          } else {
 391              $instanceid = $this->add_instance($course, (array)$data);
 392          }
 393          $step->set_mapping('enrol', $oldid, $instanceid);
 394      }
 395  
 396      /**
 397       * Restore user enrolment.
 398       *
 399       * @param restore_enrolments_structure_step $step
 400       * @param stdClass $data
 401       * @param stdClass $instance
 402       * @param int $oldinstancestatus
 403       * @param int $userid
 404       */
 405      public function restore_user_enrolment(restore_enrolments_structure_step $step, $data, $instance, $userid, $oldinstancestatus) {
 406          global $DB;
 407  
 408          // Note: this is a bit tricky because other types may be converted to manual enrolments,
 409          //       and manual is restricted to one enrolment per user.
 410  
 411          $ue = $DB->get_record('user_enrolments', array('enrolid'=>$instance->id, 'userid'=>$userid));
 412          $enrol = false;
 413          if ($ue and $ue->status == ENROL_USER_ACTIVE) {
 414              // We do not want to restrict current active enrolments, let's kind of merge the times only.
 415              // This prevents some teacher lockouts too.
 416              if ($data->status == ENROL_USER_ACTIVE) {
 417                  if ($data->timestart > $ue->timestart) {
 418                      $data->timestart = $ue->timestart;
 419                      $enrol = true;
 420                  }
 421  
 422                  if ($data->timeend == 0) {
 423                      if ($ue->timeend != 0) {
 424                          $enrol = true;
 425                      }
 426                  } else if ($ue->timeend == 0) {
 427                      $data->timeend = 0;
 428                  } else if ($data->timeend < $ue->timeend) {
 429                      $data->timeend = $ue->timeend;
 430                      $enrol = true;
 431                  }
 432              }
 433          } else {
 434              if ($instance->status == ENROL_INSTANCE_ENABLED and $oldinstancestatus != ENROL_INSTANCE_ENABLED) {
 435                  // Make sure that user enrolments are not activated accidentally,
 436                  // we do it only here because it is not expected that enrolments are migrated to other plugins.
 437                  $data->status = ENROL_USER_SUSPENDED;
 438              }
 439              $enrol = true;
 440          }
 441  
 442          if ($enrol) {
 443              $this->enrol_user($instance, $userid, null, $data->timestart, $data->timeend, $data->status);
 444          }
 445      }
 446  
 447      /**
 448       * Restore role assignment.
 449       *
 450       * @param stdClass $instance
 451       * @param int $roleid
 452       * @param int $userid
 453       * @param int $contextid
 454       */
 455      public function restore_role_assignment($instance, $roleid, $userid, $contextid) {
 456          // This is necessary only because we may migrate other types to this instance,
 457          // we do not use component in manual or self enrol.
 458          role_assign($roleid, $userid, $contextid, '', 0);
 459      }
 460  
 461      /**
 462       * Restore user group membership.
 463       * @param stdClass $instance
 464       * @param int $groupid
 465       * @param int $userid
 466       */
 467      public function restore_group_member($instance, $groupid, $userid) {
 468          global $CFG;
 469          require_once("$CFG->dirroot/group/lib.php");
 470  
 471          // This might be called when forcing restore as manual enrolments.
 472  
 473          groups_add_member($groupid, $userid);
 474      }
 475  
 476      /**
 477       * Is it possible to delete enrol instance via standard UI?
 478       *
 479       * @param object $instance
 480       * @return bool
 481       */
 482      public function can_delete_instance($instance) {
 483          $context = context_course::instance($instance->courseid);
 484          return has_capability('enrol/manual:config', $context);
 485      }
 486  
 487      /**
 488       * Is it possible to hide/show enrol instance via standard UI?
 489       *
 490       * @param stdClass $instance
 491       * @return bool
 492       */
 493      public function can_hide_show_instance($instance) {
 494          $context = context_course::instance($instance->courseid);
 495          return has_capability('enrol/manual:config', $context);
 496      }
 497  
 498      /**
 499       * Enrol all not enrolled cohort members into course via enrol instance.
 500       *
 501       * @param stdClass $instance
 502       * @param int $cohortid
 503       * @param int $roleid optional role id
 504       * @param int $timestart 0 means unknown
 505       * @param int $timeend 0 means forever
 506       * @param int $status default to ENROL_USER_ACTIVE for new enrolments, no change by default in updates
 507       * @param bool $recovergrades restore grade history
 508       * @return int The number of enrolled cohort users
 509       */
 510      public function enrol_cohort(stdClass $instance, $cohortid, $roleid = null, $timestart = 0, $timeend = 0, $status = null, $recovergrades = null) {
 511          global $DB;
 512          $context = context_course::instance($instance->courseid);
 513          list($esql, $params) = get_enrolled_sql($context);
 514          $sql = "SELECT cm.userid FROM {cohort_members} cm LEFT JOIN ($esql) u ON u.id = cm.userid ".
 515              "WHERE cm.cohortid = :cohortid AND u.id IS NULL";
 516          $params['cohortid'] = $cohortid;
 517          $members = $DB->get_fieldset_sql($sql, $params);
 518          foreach ($members as $userid) {
 519              $this->enrol_user($instance, $userid, $roleid, $timestart, $timeend, $status, $recovergrades);
 520          }
 521          return count($members);
 522      }
 523  
 524      /**
 525       * We are a good plugin and don't invent our own UI/validation code path.
 526       *
 527       * @return boolean
 528       */
 529      public function use_standard_editing_ui() {
 530          return true;
 531      }
 532  
 533      /**
 534       * Return an array of valid options for the status.
 535       *
 536       * @return array
 537       */
 538      protected function get_status_options() {
 539          $options = array(ENROL_INSTANCE_ENABLED  => get_string('yes'),
 540                           ENROL_INSTANCE_DISABLED => get_string('no'));
 541          return $options;
 542      }
 543  
 544      /**
 545       * Return an array of valid options for the roleid.
 546       *
 547       * @param stdClass $instance
 548       * @param context $context
 549       * @return array
 550       */
 551      protected function get_roleid_options($instance, $context) {
 552          if ($instance->id) {
 553              $roles = get_default_enrol_roles($context, $instance->roleid);
 554          } else {
 555              $roles = get_default_enrol_roles($context, $this->get_config('roleid'));
 556          }
 557          return $roles;
 558      }
 559  
 560      /**
 561       * Return an array of valid options for the expirynotify.
 562       *
 563       * @return array
 564       */
 565      protected function get_expirynotify_options() {
 566          $options = array(
 567              0 => get_string('no'),
 568              1 => get_string('expirynotifyenroller', 'core_enrol'),
 569              2 => get_string('expirynotifyall', 'core_enrol')
 570          );
 571          return $options;
 572      }
 573  
 574      /**
 575       * Add elements to the edit instance form.
 576       *
 577       * @param stdClass $instance
 578       * @param MoodleQuickForm $mform
 579       * @param context $context
 580       * @return bool
 581       */
 582      public function edit_instance_form($instance, MoodleQuickForm $mform, $context) {
 583  
 584          $options = $this->get_status_options();
 585          $mform->addElement('select', 'status', get_string('status', 'enrol_manual'), $options);
 586          $mform->addHelpButton('status', 'status', 'enrol_manual');
 587          $mform->setDefault('status', $this->get_config('status'));
 588  
 589          $roles = $this->get_roleid_options($instance, $context);
 590          $mform->addElement('select', 'roleid', get_string('defaultrole', 'role'), $roles);
 591          $mform->setDefault('roleid', $this->get_config('roleid'));
 592  
 593          $options = array('optional' => true, 'defaultunit' => 86400);
 594          $mform->addElement('duration', 'enrolperiod', get_string('defaultperiod', 'enrol_manual'), $options);
 595          $mform->setDefault('enrolperiod', $this->get_config('enrolperiod'));
 596          $mform->addHelpButton('enrolperiod', 'defaultperiod', 'enrol_manual');
 597  
 598          $options = $this->get_expirynotify_options();
 599          $mform->addElement('select', 'expirynotify', get_string('expirynotify', 'core_enrol'), $options);
 600          $mform->addHelpButton('expirynotify', 'expirynotify', 'core_enrol');
 601  
 602          $options = array('optional' => false, 'defaultunit' => 86400);
 603          $mform->addElement('duration', 'expirythreshold', get_string('expirythreshold', 'core_enrol'), $options);
 604          $mform->addHelpButton('expirythreshold', 'expirythreshold', 'core_enrol');
 605          $mform->disabledIf('expirythreshold', 'expirynotify', 'eq', 0);
 606  
 607          if (enrol_accessing_via_instance($instance)) {
 608              $warntext = get_string('instanceeditselfwarningtext', 'core_enrol');
 609              $mform->addElement('static', 'selfwarn', get_string('instanceeditselfwarning', 'core_enrol'), $warntext);
 610          }
 611      }
 612  
 613      /**
 614       * Perform custom validation of the data used to edit the instance.
 615       *
 616       * @param array $data array of ("fieldname"=>value) of submitted data
 617       * @param array $files array of uploaded files "element_name"=>tmp_file_path
 618       * @param object $instance The instance loaded from the DB
 619       * @param context $context The context of the instance we are editing
 620       * @return array of "element_name"=>"error_description" if there are errors,
 621       *         or an empty array if everything is OK.
 622       * @return void
 623       */
 624      public function edit_instance_validation($data, $files, $instance, $context) {
 625          $errors = array();
 626  
 627          if ($data['expirynotify'] > 0 and $data['expirythreshold'] < 86400) {
 628              $errors['expirythreshold'] = get_string('errorthresholdlow', 'core_enrol');
 629          }
 630  
 631          $validstatus = array_keys($this->get_status_options());
 632          $validroles = array_keys($this->get_roleid_options($instance, $context));
 633          $validexpirynotify = array_keys($this->get_expirynotify_options());
 634  
 635          $tovalidate = array(
 636              'status' => $validstatus,
 637              'roleid' => $validroles,
 638              'enrolperiod' => PARAM_INT,
 639              'expirynotify' => $validexpirynotify,
 640              'expirythreshold' => PARAM_INT
 641          );
 642  
 643          $typeerrors = $this->validate_param_types($data, $tovalidate);
 644          $errors = array_merge($errors, $typeerrors);
 645  
 646          return $errors;
 647      }
 648  
 649  }
 650  
 651  /**
 652   * Serve the manual enrol users form as a fragment.
 653   *
 654   * @param array $args List of named arguments for the fragment loader.
 655   * @return string
 656   */
 657  function enrol_manual_output_fragment_enrol_users_form($args) {
 658      $args = (object) $args;
 659      $context = $args->context;
 660      $o = '';
 661  
 662      require_capability('enrol/manual:enrol', $context);
 663      $mform = new enrol_manual_enrol_users_form(null, $args);
 664  
 665      ob_start();
 666      $mform->display();
 667      $o .= ob_get_contents();
 668      ob_end_clean();
 669  
 670      return $o;
 671  }