enrol/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 course_enrolment_manager class which is used to interface
  19  * with the functions that exist in enrollib.php in relation to a single course.
  20  *
  21  * @package    core_enrol
  22  * @copyright  2010 Sam Hemelryk
  23  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25
  26 defined('MOODLE_INTERNAL') || die();
  27
  28 /**
  29  * This class provides a targeted tied together means of interfacing the enrolment
  30  * tasks together with a course.
  31  *
  32  * It is provided as a convenience more than anything else.
  33  *
  34  * @copyright 2010 Sam Hemelryk
  35  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  36  */
  37 class course_enrolment_manager {
  38
  39     /**
  40      * The course context
  41      * @var stdClass
  42      */
  43     protected $context;
  44     /**
  45      * The course we are managing enrolments for
  46      * @var stdClass
  47      */
  48     protected $course = null;
  49     /**
  50      * Limits the focus of the manager to one enrolment plugin instance
  51      * @var string
  52      */
  53     protected $instancefilter = null;
  54     /**
  55      * Limits the focus of the manager to users with specified role
  56      * @var int
  57      */
  58     protected $rolefilter = 0;
  59     /**
  60      * Limits the focus of the manager to users who match search string
  61      * @var string
  62      */
  63     protected $searchfilter = '';
  64     /**
  65      * Limits the focus of the manager to users in specified group
  66      * @var int
  67      */
  68     protected $groupfilter = 0;
  69     /**
  70      * Limits the focus of the manager to users who match status active/inactive
  71      * @var int
  72      */
  73     protected $statusfilter = -1;
  74
  75     /**
  76      * The total number of users enrolled in the course
  77      * Populated by course_enrolment_manager::get_total_users
  78      * @var int
  79      */
  80     protected $totalusers = null;
  81     /**
  82      * An array of users currently enrolled in the course
  83      * Populated by course_enrolment_manager::get_users
  84      * @var array
  85      */
  86     protected $users = array();
  87
  88     /**
  89      * An array of users who have roles within this course but who have not
  90      * been enrolled in the course
  91      * @var array
  92      */
  93     protected $otherusers = array();
  94
  95     /**
  96      * The total number of users who hold a role within the course but who
  97      * arn't enrolled.
  98      * @var int
  99      */
 100     protected $totalotherusers = null;
 101
 102     /**
 103      * The current moodle_page object
 104      * @var moodle_page
 105      */
 106     protected $moodlepage = null;
 107
 108     /**#@+
 109      * These variables are used to cache the information this class uses
 110      * please never use these directly instead use their get_ counterparts.
 111      * @access private
 112      * @var array
 113      */
 114     private $_instancessql = null;
 115     private $_instances = null;
 116     private $_inames = null;
 117     private $_plugins = null;
 118     private $_allplugins = null;
 119     private $_roles = null;
 120     private $_assignableroles = null;
 121     private $_assignablerolesothers = null;
 122     private $_groups = null;
 123     /**#@-*/
 124
 125     /**
 126      * Constructs the course enrolment manager
 127      *
 128      * @param moodle_page $moodlepage
 129      * @param stdClass $course
 130      * @param string $instancefilter
 131      * @param int $rolefilter If non-zero, filters to users with specified role
 132      * @param string $searchfilter If non-blank, filters to users with search text
 133      * @param int $groupfilter if non-zero, filter users with specified group
 134      * @param int $statusfilter if not -1, filter users with active/inactive enrollment.
 135      */
 136     public function __construct(moodle_page $moodlepage, $course, $instancefilter = null,
 137             $rolefilter = 0, $searchfilter = '', $groupfilter = 0, $statusfilter = -1) {
 138         $this->moodlepage = $moodlepage;
 139         $this->context = context_course::instance($course->id);
 140         $this->course = $course;
 141         $this->instancefilter = $instancefilter;
 142         $this->rolefilter = $rolefilter;
 143         $this->searchfilter = $searchfilter;
 144         $this->groupfilter = $groupfilter;
 145         $this->statusfilter = $statusfilter;
 146     }
 147
 148     /**
 149      * Returns the current moodle page
 150      * @return moodle_page
 151      */
 152     public function get_moodlepage() {
 153         return $this->moodlepage;
 154     }
 155
 156     /**
 157      * Returns the total number of enrolled users in the course.
 158      *
 159      * If a filter was specificed this will be the total number of users enrolled
 160      * in this course by means of that instance.
 161      *
 162      * @global moodle_database $DB
 163      * @return int
 164      */
 165     public function get_total_users() {
 166         global $DB;
 167         if ($this->totalusers === null) {
 168             list($instancessql, $params, $filter) = $this->get_instance_sql();
 169             list($filtersql, $moreparams) = $this->get_filter_sql();
 170             $params += $moreparams;
 171             $sqltotal = "SELECT COUNT(DISTINCT u.id)
 172                            FROM {user} u
 173                            JOIN {user_enrolments} ue ON (ue.userid = u.id  AND ue.enrolid $instancessql)
 174                            JOIN {enrol} e ON (e.id = ue.enrolid)
 175                       LEFT JOIN {groups_members} gm ON u.id = gm.userid
 176                           WHERE $filtersql";
 177             $this->totalusers = (int)$DB->count_records_sql($sqltotal, $params);
 178         }
 179         return $this->totalusers;
 180     }
 181
 182     /**
 183      * Returns the total number of enrolled users in the course.
 184      *
 185      * If a filter was specificed this will be the total number of users enrolled
 186      * in this course by means of that instance.
 187      *
 188      * @global moodle_database $DB
 189      * @return int
 190      */
 191     public function get_total_other_users() {
 192         global $DB;
 193         if ($this->totalotherusers === null) {
 194             list($ctxcondition, $params) = $DB->get_in_or_equal($this->context->get_parent_context_ids(true), SQL_PARAMS_NAMED, 'ctx');
 195             $params['courseid'] = $this->course->id;
 196             $sql = "SELECT COUNT(DISTINCT u.id)
 197                       FROM {role_assignments} ra
 198                       JOIN {user} u ON u.id = ra.userid
 199                       JOIN {context} ctx ON ra.contextid = ctx.id
 200                  LEFT JOIN (
 201                            SELECT ue.id, ue.userid
 202                              FROM {user_enrolments} ue
 203                         LEFT JOIN {enrol} e ON e.id=ue.enrolid
 204                             WHERE e.courseid = :courseid
 205                          ) ue ON ue.userid=u.id
 206                      WHERE ctx.id $ctxcondition AND
 207                            ue.id IS NULL";
 208             $this->totalotherusers = (int)$DB->count_records_sql($sql, $params);
 209         }
 210         return $this->totalotherusers;
 211     }
 212
 213     /**
 214      * Gets all of the users enrolled in this course.
 215      *
 216      * If a filter was specified this will be the users who were enrolled
 217      * in this course by means of that instance. If role or search filters were
 218      * specified then these will also be applied.
 219      *
 220      * @global moodle_database $DB
 221      * @param string $sort
 222      * @param string $direction ASC or DESC
 223      * @param int $page First page should be 0
 224      * @param int $perpage Defaults to 25
 225      * @return array
 226      */
 227     public function get_users($sort, $direction='ASC', $page=0, $perpage=25) {
 228         global $DB;
 229         if ($direction !== 'ASC') {
 230             $direction = 'DESC';
 231         }
 232         $key = md5("$sort-$direction-$page-$perpage");
 233         if (!array_key_exists($key, $this->users)) {
 234             list($instancessql, $params, $filter) = $this->get_instance_sql();
 235             list($filtersql, $moreparams) = $this->get_filter_sql();
 236             $params += $moreparams;
 237             $extrafields = get_extra_user_fields($this->get_context());
 238             $extrafields[] = 'lastaccess';
 239             $ufields = user_picture::fields('u', $extrafields);
 240             $sql = "SELECT DISTINCT $ufields, ul.timeaccess AS lastseen
 241                       FROM {user} u
 242                       JOIN {user_enrolments} ue ON (ue.userid = u.id  AND ue.enrolid $instancessql)
 243                       JOIN {enrol} e ON (e.id = ue.enrolid)
 244                  LEFT JOIN {user_lastaccess} ul ON (ul.courseid = e.courseid AND ul.userid = u.id)
 245                  LEFT JOIN {groups_members} gm ON u.id = gm.userid
 246                      WHERE $filtersql
 247                   ORDER BY u.$sort $direction";
 248             $this->users[$key] = $DB->get_records_sql($sql, $params, $page*$perpage, $perpage);
 249         }
 250         return $this->users[$key];
 251     }
 252
 253     /**
 254      * Obtains WHERE clause to filter results by defined search and role filter
 255      * (instance filter is handled separately in JOIN clause, see
 256      * get_instance_sql).
 257      *
 258      * @return array Two-element array with SQL and params for WHERE clause
 259      */
 260     protected function get_filter_sql() {
 261         global $DB;
 262
 263         // Search condition.
 264         $extrafields = get_extra_user_fields($this->get_context());
 265         list($sql, $params) = users_search_sql($this->searchfilter, 'u', true, $extrafields);
 266
 267         // Role condition.
 268         if ($this->rolefilter) {
 269             // Get context SQL.
 270             $contextids = $this->context->get_parent_context_ids();
 271             $contextids[] = $this->context->id;
 272             list($contextsql, $contextparams) = $DB->get_in_or_equal($contextids, SQL_PARAMS_NAMED);
 273             $params += $contextparams;
 274
 275             // Role check condition.
 276             $sql .= " AND (SELECT COUNT(1) FROM {role_assignments} ra WHERE ra.userid = u.id " .
 277                     "AND ra.roleid = :roleid AND ra.contextid $contextsql) > 0";
 278             $params['roleid'] = $this->rolefilter;
 279         }
 280
 281         // Group condition.
 282         if ($this->groupfilter) {
 283             $sql .= " AND gm.groupid = :groupid";
 284             $params['groupid'] = $this->groupfilter;
 285         }
 286
 287         // Status condition.
 288         if ($this->statusfilter === ENROL_USER_ACTIVE) {
 289             $sql .= " AND ue.status = :active AND e.status = :enabled AND ue.timestart < :now1
 290                     AND (ue.timeend = 0 OR ue.timeend > :now2)";
 291             $now = round(time(), -2); // rounding helps caching in DB
 292             $params += array('enabled' => ENROL_INSTANCE_ENABLED,
 293                              'active' => ENROL_USER_ACTIVE,
 294                              'now1' => $now,
 295                              'now2' => $now);
 296         } else if ($this->statusfilter === ENROL_USER_SUSPENDED) {
 297             $sql .= " AND (ue.status = :inactive OR e.status = :disabled OR ue.timestart > :now1
 298                     OR (ue.timeend <> 0 AND ue.timeend < :now2))";
 299             $now = round(time(), -2); // rounding helps caching in DB
 300             $params += array('disabled' => ENROL_INSTANCE_DISABLED,
 301                              'inactive' => ENROL_USER_SUSPENDED,
 302                              'now1' => $now,
 303                              'now2' => $now);
 304         }
 305
 306         return array($sql, $params);
 307     }
 308
 309     /**
 310      * Gets and array of other users.
 311      *
 312      * Other users are users who have been assigned roles or inherited roles
 313      * within this course but who have not been enrolled in the course
 314      *
 315      * @global moodle_database $DB
 316      * @param string $sort
 317      * @param string $direction
 318      * @param int $page
 319      * @param int $perpage
 320      * @return array
 321      */
 322     public function get_other_users($sort, $direction='ASC', $page=0, $perpage=25) {
 323         global $DB;
 324         if ($direction !== 'ASC') {
 325             $direction = 'DESC';
 326         }
 327         $key = md5("$sort-$direction-$page-$perpage");
 328         if (!array_key_exists($key, $this->otherusers)) {
 329             list($ctxcondition, $params) = $DB->get_in_or_equal($this->context->get_parent_context_ids(true), SQL_PARAMS_NAMED, 'ctx');
 330             $params['courseid'] = $this->course->id;
 331             $params['cid'] = $this->course->id;
 332             $sql = "SELECT ra.id as raid, ra.contextid, ra.component, ctx.contextlevel, ra.roleid, u.*, ue.lastseen
 333                     FROM {role_assignments} ra
 334                     JOIN {user} u ON u.id = ra.userid
 335                     JOIN {context} ctx ON ra.contextid = ctx.id
 336                LEFT JOIN (
 337                        SELECT ue.id, ue.userid, ul.timeaccess AS lastseen
 338                          FROM {user_enrolments} ue
 339                     LEFT JOIN {enrol} e ON e.id=ue.enrolid
 340                     LEFT JOIN {user_lastaccess} ul ON (ul.courseid = e.courseid AND ul.userid = ue.userid)
 341                         WHERE e.courseid = :courseid
 342                        ) ue ON ue.userid=u.id
 343                    WHERE ctx.id $ctxcondition AND
 344                          ue.id IS NULL
 345                 ORDER BY u.$sort $direction, ctx.depth DESC";
 346             $this->otherusers[$key] = $DB->get_records_sql($sql, $params, $page*$perpage, $perpage);
 347         }
 348         return $this->otherusers[$key];
 349     }
 350
 351     /**
 352      * Helper method used by {@link get_potential_users()} and {@link search_other_users()}.
 353      *
 354      * @param string $search the search term, if any.
 355      * @param bool $searchanywhere Can the search term be anywhere, or must it be at the start.
 356      * @return array with three elements:
 357      *     string list of fields to SELECT,
 358      *     string contents of SQL WHERE clause,
 359      *     array query params. Note that the SQL snippets use named parameters.
 360      */
 361     protected function get_basic_search_conditions($search, $searchanywhere) {
 362         global $DB, $CFG;
 363
 364         // Add some additional sensible conditions
 365         $tests = array("u.id <> :guestid", 'u.deleted = 0', 'u.confirmed = 1');
 366         $params = array('guestid' => $CFG->siteguest);
 367         if (!empty($search)) {
 368             $conditions = get_extra_user_fields($this->get_context());
 369             $conditions[] = 'u.firstname';
 370             $conditions[] = 'u.lastname';
 371             $conditions[] = $DB->sql_fullname('u.firstname', 'u.lastname');
 372             if ($searchanywhere) {
 373                 $searchparam = '%' . $search . '%';
 374             } else {
 375                 $searchparam = $search . '%';
 376             }
 377             $i = 0;
 378             foreach ($conditions as $key => $condition) {
 379                 $conditions[$key] = $DB->sql_like($condition, ":con{$i}00", false);
 380                 $params["con{$i}00"] = $searchparam;
 381                 $i++;
 382             }
 383             $tests[] = '(' . implode(' OR ', $conditions) . ')';
 384         }
 385         $wherecondition = implode(' AND ', $tests);
 386
 387         $extrafields = get_extra_user_fields($this->get_context(), array('username', 'lastaccess'));
 388         $extrafields[] = 'username';
 389         $extrafields[] = 'lastaccess';
 390         $ufields = user_picture::fields('u', $extrafields);
 391
 392         return array($ufields, $params, $wherecondition);
 393     }
 394
 395     /**
 396      * Helper method used by {@link get_potential_users()} and {@link search_other_users()}.
 397      *
 398      * @param string $search the search string, if any.
 399      * @param string $fields the first bit of the SQL when returning some users.
 400      * @param string $countfields fhe first bit of the SQL when counting the users.
 401      * @param string $sql the bulk of the SQL statement.
 402      * @param array $params query parameters.
 403      * @param int $page which page number of the results to show.
 404      * @param int $perpage number of users per page.
 405      * @param int $addedenrollment number of users added to enrollment.
 406      * @return array with two elememts:
 407      *      int total number of users matching the search.
 408      *      array of user objects returned by the query.
 409      */
 410     protected function execute_search_queries($search, $fields, $countfields, $sql, array $params, $page, $perpage, $addedenrollment=0) {
 411         global $DB, $CFG;
 412
 413         list($sort, $sortparams) = users_order_by_sql('u', $search, $this->get_context());
 414         $order = ' ORDER BY ' . $sort;
 415
 416         $totalusers = $DB->count_records_sql($countfields . $sql, $params);
 417         $availableusers = $DB->get_records_sql($fields . $sql . $order,
 418                 array_merge($params, $sortparams), ($page*$perpage) - $addedenrollment, $perpage);
 419
 420         return array('totalusers' => $totalusers, 'users' => $availableusers);
 421     }
 422
 423     /**
 424      * Gets an array of the users that can be enrolled in this course.
 425      *
 426      * @global moodle_database $DB
 427      * @param int $enrolid
 428      * @param string $search
 429      * @param bool $searchanywhere
 430      * @param int $page Defaults to 0
 431      * @param int $perpage Defaults to 25
 432      * @param int $addedenrollment Defaults to 0
 433      * @return array Array(totalusers => int, users => array)
 434      */
 435     public function get_potential_users($enrolid, $search='', $searchanywhere=false, $page=0, $perpage=25, $addedenrollment=0) {
 436         global $DB;
 437
 438         list($ufields, $params, $wherecondition) = $this->get_basic_search_conditions($search, $searchanywhere);
 439
 440         $fields      = 'SELECT '.$ufields;
 441         $countfields = 'SELECT COUNT(1)';
 442         $sql = " FROM {user} u
 443             LEFT JOIN {user_enrolments} ue ON (ue.userid = u.id AND ue.enrolid = :enrolid)
 444                 WHERE $wherecondition
 445                       AND ue.id IS NULL";
 446         $params['enrolid'] = $enrolid;
 447
 448         return $this->execute_search_queries($search, $fields, $countfields, $sql, $params, $page, $perpage, $addedenrollment);
 449     }
 450
 451     /**
 452      * Searches other users and returns paginated results
 453      *
 454      * @global moodle_database $DB
 455      * @param string $search
 456      * @param bool $searchanywhere
 457      * @param int $page Starting at 0
 458      * @param int $perpage
 459      * @return array
 460      */
 461     public function search_other_users($search='', $searchanywhere=false, $page=0, $perpage=25) {
 462         global $DB, $CFG;
 463
 464         list($ufields, $params, $wherecondition) = $this->get_basic_search_conditions($search, $searchanywhere);
 465
 466         $fields      = 'SELECT ' . $ufields;
 467         $countfields = 'SELECT COUNT(u.id)';
 468         $sql   = " FROM {user} u
 469               LEFT JOIN {role_assignments} ra ON (ra.userid = u.id AND ra.contextid = :contextid)
 470                   WHERE $wherecondition
 471                     AND ra.id IS NULL";
 472         $params['contextid'] = $this->context->id;
 473
 474         return $this->execute_search_queries($search, $fields, $countfields, $sql, $params, $page, $perpage);
 475     }
 476
 477     /**
 478      * Gets an array containing some SQL to user for when selecting, params for
 479      * that SQL, and the filter that was used in constructing the sql.
 480      *
 481      * @global moodle_database $DB
 482      * @return string
 483      */
 484     protected function get_instance_sql() {
 485         global $DB;
 486         if ($this->_instancessql === null) {
 487             $instances = $this->get_enrolment_instances();
 488             $filter = $this->get_enrolment_filter();
 489             if ($filter && array_key_exists($filter, $instances)) {
 490                 $sql = " = :ifilter";
 491                 $params = array('ifilter'=>$filter);
 492             } else {
 493                 $filter = 0;
 494                 if ($instances) {
 495                     list($sql, $params) = $DB->get_in_or_equal(array_keys($this->get_enrolment_instances()), SQL_PARAMS_NAMED);
 496                 } else {
 497                     // no enabled instances, oops, we should probably say something
 498                     $sql = "= :never";
 499                     $params = array('never'=>-1);
 500                 }
 501             }
 502             $this->instancefilter = $filter;
 503             $this->_instancessql = array($sql, $params, $filter);
 504         }
 505         return $this->_instancessql;
 506     }
 507
 508     /**
 509      * Returns all of the enrolment instances for this course.
 510      *
 511      * NOTE: since 2.4 it includes instances of disabled plugins too.
 512      *
 513      * @return array
 514      */
 515     public function get_enrolment_instances() {
 516         if ($this->_instances === null) {
 517             $this->_instances = enrol_get_instances($this->course->id, false);
 518         }
 519         return $this->_instances;
 520     }
 521
 522     /**
 523      * Returns the names for all of the enrolment instances for this course.
 524      *
 525      * NOTE: since 2.4 it includes instances of disabled plugins too.
 526      *
 527      * @return array
 528      */
 529     public function get_enrolment_instance_names() {
 530         if ($this->_inames === null) {
 531             $instances = $this->get_enrolment_instances();
 532             $plugins = $this->get_enrolment_plugins(false);
 533             foreach ($instances as $key=>$instance) {
 534                 if (!isset($plugins[$instance->enrol])) {
 535                     // weird, some broken stuff in plugin
 536                     unset($instances[$key]);
 537                     continue;
 538                 }
 539                 $this->_inames[$key] = $plugins[$instance->enrol]->get_instance_name($instance);
 540             }
 541         }
 542         return $this->_inames;
 543     }
 544
 545     /**
 546      * Gets all of the enrolment plugins that are active for this course.
 547      *
 548      * @param bool $onlyenabled return only enabled enrol plugins
 549      * @return array
 550      */
 551     public function get_enrolment_plugins($onlyenabled = true) {
 552         if ($this->_plugins === null) {
 553             $this->_plugins = enrol_get_plugins(true);
 554         }
 555
 556         if ($onlyenabled) {
 557             return $this->_plugins;
 558         }
 559
 560         if ($this->_allplugins === null) {
 561             // Make sure we have the same objects in _allplugins and _plugins.
 562             $this->_allplugins = $this->_plugins;
 563             foreach (enrol_get_plugins(false) as $name=>$plugin) {
 564                 if (!isset($this->_allplugins[$name])) {
 565                     $this->_allplugins[$name] = $plugin;
 566                 }
 567             }
 568         }
 569
 570         return $this->_allplugins;
 571     }
 572
 573     /**
 574      * Gets all of the roles this course can contain.
 575      *
 576      * @return array
 577      */
 578     public function get_all_roles() {
 579         if ($this->_roles === null) {
 580             $this->_roles = role_fix_names(get_all_roles($this->context), $this->context);
 581         }
 582         return $this->_roles;
 583     }
 584
 585     /**
 586      * Gets all of the assignable roles for this course.
 587      *
 588      * @return array
 589      */
 590     public function get_assignable_roles($otherusers = false) {
 591         if ($this->_assignableroles === null) {
 592             $this->_assignableroles = get_assignable_roles($this->context, ROLENAME_ALIAS, false); // verifies unassign access control too
 593         }
 594
 595         if ($otherusers) {
 596             if (!is_array($this->_assignablerolesothers)) {
 597                 $this->_assignablerolesothers = array();
 598                 list($courseviewroles, $ignored) = get_roles_with_cap_in_context($this->context, 'moodle/course:view');
 599                 foreach ($this->_assignableroles as $roleid=>$role) {
 600                     if (isset($courseviewroles[$roleid])) {
 601                         $this->_assignablerolesothers[$roleid] = $role;
 602                     }
 603                 }
 604             }
 605             return $this->_assignablerolesothers;
 606         } else {
 607             return $this->_assignableroles;
 608         }
 609     }
 610
 611     /**
 612      * Gets all of the groups for this course.
 613      *
 614      * @return array
 615      */
 616     public function get_all_groups() {
 617         if ($this->_groups === null) {
 618             $this->_groups = groups_get_all_groups($this->course->id);
 619             foreach ($this->_groups as $gid=>$group) {
 620                 $this->_groups[$gid]->name = format_string($group->name);
 621             }
 622         }
 623         return $this->_groups;
 624     }
 625
 626     /**
 627      * Unenrols a user from the course given the users ue entry
 628      *
 629      * @global moodle_database $DB
 630      * @param stdClass $ue
 631      * @return bool
 632      */
 633     public function unenrol_user($ue) {
 634         global $DB;
 635         list ($instance, $plugin) = $this->get_user_enrolment_components($ue);
 636         if ($instance && $plugin && $plugin->allow_unenrol_user($instance, $ue) && has_capability("enrol/$instance->enrol:unenrol", $this->context)) {
 637             $plugin->unenrol_user($instance, $ue->userid);
 638             return true;
 639         }
 640         return false;
 641     }
 642
 643     /**
 644      * Given a user enrolment record this method returns the plugin and enrolment
 645      * instance that relate to it.
 646      *
 647      * @param stdClass|int $userenrolment
 648      * @return array array($instance, $plugin)
 649      */
 650     public function get_user_enrolment_components($userenrolment) {
 651         global $DB;
 652         if (is_numeric($userenrolment)) {
 653             $userenrolment = $DB->get_record('user_enrolments', array('id'=>(int)$userenrolment));
 654         }
 655         $instances = $this->get_enrolment_instances();
 656         $plugins = $this->get_enrolment_plugins(false);
 657         if (!$userenrolment || !isset($instances[$userenrolment->enrolid])) {
 658             return array(false, false);
 659         }
 660         $instance = $instances[$userenrolment->enrolid];
 661         $plugin = $plugins[$instance->enrol];
 662         return array($instance, $plugin);
 663     }
 664
 665     /**
 666      * Removes an assigned role from a user.
 667      *
 668      * @global moodle_database $DB
 669      * @param int $userid
 670      * @param int $roleid
 671      * @return bool
 672      */
 673     public function unassign_role_from_user($userid, $roleid) {
 674         global $DB;
 675         // Admins may unassign any role, others only those they could assign.
 676         if (!is_siteadmin() and !array_key_exists($roleid, $this->get_assignable_roles())) {
 677             if (defined('AJAX_SCRIPT')) {
 678                 throw new moodle_exception('invalidrole');
 679             }
 680             return false;
 681         }
 682         $user = $DB->get_record('user', array('id'=>$userid), '*', MUST_EXIST);
 683         $ras = $DB->get_records('role_assignments', array('contextid'=>$this->context->id, 'userid'=>$user->id, 'roleid'=>$roleid));
 684         foreach ($ras as $ra) {
 685             if ($ra->component) {
 686                 if (strpos($ra->component, 'enrol_') !== 0) {
 687                     continue;
 688                 }
 689                 if (!$plugin = enrol_get_plugin(substr($ra->component, 6))) {
 690                     continue;
 691                 }
 692                 if ($plugin->roles_protected()) {
 693                     continue;
 694                 }
 695             }
 696             role_unassign($ra->roleid, $ra->userid, $ra->contextid, $ra->component, $ra->itemid);
 697         }
 698         return true;
 699     }
 700
 701     /**
 702      * Assigns a role to a user.
 703      *
 704      * @param int $roleid
 705      * @param int $userid
 706      * @return int|false
 707      */
 708     public function assign_role_to_user($roleid, $userid) {
 709         require_capability('moodle/role:assign', $this->context);
 710         if (!array_key_exists($roleid, $this->get_assignable_roles())) {
 711             if (defined('AJAX_SCRIPT')) {
 712                 throw new moodle_exception('invalidrole');
 713             }
 714             return false;
 715         }
 716         return role_assign($roleid, $userid, $this->context->id, '', NULL);
 717     }
 718
 719     /**
 720      * Adds a user to a group
 721      *
 722      * @param stdClass $user
 723      * @param int $groupid
 724      * @return bool
 725      */
 726     public function add_user_to_group($user, $groupid) {
 727         require_capability('moodle/course:managegroups', $this->context);
 728         $group = $this->get_group($groupid);
 729         if (!$group) {
 730             return false;
 731         }
 732         return groups_add_member($group->id, $user->id);
 733     }
 734
 735     /**
 736      * Removes a user from a group
 737      *
 738      * @global moodle_database $DB
 739      * @param StdClass $user
 740      * @param int $groupid
 741      * @return bool
 742      */
 743     public function remove_user_from_group($user, $groupid) {
 744         global $DB;
 745         require_capability('moodle/course:managegroups', $this->context);
 746         $group = $this->get_group($groupid);
 747         if (!groups_remove_member_allowed($group, $user)) {
 748             return false;
 749         }
 750         if (!$group) {
 751             return false;
 752         }
 753         return groups_remove_member($group, $user);
 754     }
 755
 756     /**
 757      * Gets the requested group
 758      *
 759      * @param int $groupid
 760      * @return stdClass|int
 761      */
 762     public function get_group($groupid) {
 763         $groups = $this->get_all_groups();
 764         if (!array_key_exists($groupid, $groups)) {
 765             return false;
 766         }
 767         return $groups[$groupid];
 768     }
 769
 770     /**
 771      * Edits an enrolment
 772      *
 773      * @param stdClass $userenrolment
 774      * @param stdClass $data
 775      * @return bool
 776      */
 777     public function edit_enrolment($userenrolment, $data) {
 778         //Only allow editing if the user has the appropriate capability
 779         //Already checked in /enrol/users.php but checking again in case this function is called from elsewhere
 780         list($instance, $plugin) = $this->get_user_enrolment_components($userenrolment);
 781         if ($instance && $plugin && $plugin->allow_manage($instance) && has_capability("enrol/$instance->enrol:manage", $this->context)) {
 782             if (!isset($data->status)) {
 783                 $data->status = $userenrolment->status;
 784             }
 785             $plugin->update_user_enrol($instance, $userenrolment->userid, $data->status, $data->timestart, $data->timeend);
 786             return true;
 787         }
 788         return false;
 789     }
 790
 791     /**
 792      * Returns the current enrolment filter that is being applied by this class
 793      * @return string
 794      */
 795     public function get_enrolment_filter() {
 796         return $this->instancefilter;
 797     }
 798
 799     /**
 800      * Gets the roles assigned to this user that are applicable for this course.
 801      *
 802      * @param int $userid
 803      * @return array
 804      */
 805     public function get_user_roles($userid) {
 806         $roles = array();
 807         $ras = get_user_roles($this->context, $userid, true, 'c.contextlevel DESC, r.sortorder ASC');
 808         $plugins = $this->get_enrolment_plugins(false);
 809         foreach ($ras as $ra) {
 810             if ($ra->contextid != $this->context->id) {
 811                 if (!array_key_exists($ra->roleid, $roles)) {
 812                     $roles[$ra->roleid] = null;
 813                 }
 814                 // higher ras, course always takes precedence
 815                 continue;
 816             }
 817             if (array_key_exists($ra->roleid, $roles) && $roles[$ra->roleid] === false) {
 818                 continue;
 819             }
 820             $changeable = true;
 821             if ($ra->component) {
 822                 $changeable = false;
 823                 if (strpos($ra->component, 'enrol_') === 0) {
 824                     $plugin = substr($ra->component, 6);
 825                     if (isset($plugins[$plugin])) {
 826                         $changeable = !$plugins[$plugin]->roles_protected();
 827                     }
 828                 }
 829             }
 830
 831             $roles[$ra->roleid] = $changeable;
 832         }
 833         return $roles;
 834     }
 835
 836     /**
 837      * Gets the enrolments this user has in the course - including all suspended plugins and instances.
 838      *
 839      * @global moodle_database $DB
 840      * @param int $userid
 841      * @return array
 842      */
 843     public function get_user_enrolments($userid) {
 844         global $DB;
 845         list($instancessql, $params, $filter) = $this->get_instance_sql();
 846         $params['userid'] = $userid;
 847         $userenrolments = $DB->get_records_select('user_enrolments', "enrolid $instancessql AND userid = :userid", $params);
 848         $instances = $this->get_enrolment_instances();
 849         $plugins = $this->get_enrolment_plugins(false);
 850         $inames = $this->get_enrolment_instance_names();
 851         foreach ($userenrolments as &$ue) {
 852             $ue->enrolmentinstance     = $instances[$ue->enrolid];
 853             $ue->enrolmentplugin       = $plugins[$ue->enrolmentinstance->enrol];
 854             $ue->enrolmentinstancename = $inames[$ue->enrolmentinstance->id];
 855         }
 856         return $userenrolments;
 857     }
 858
 859     /**
 860      * Gets the groups this user belongs to
 861      *
 862      * @param int $userid
 863      * @return array
 864      */
 865     public function get_user_groups($userid) {
 866         return groups_get_all_groups($this->course->id, $userid, 0, 'g.id');
 867     }
 868
 869     /**
 870      * Retursn an array of params that would go into the URL to return to this
 871      * exact page.
 872      *
 873      * @return array
 874      */
 875     public function get_url_params() {
 876         $args = array(
 877             'id' => $this->course->id
 878         );
 879         if (!empty($this->instancefilter)) {
 880             $args['ifilter'] = $this->instancefilter;
 881         }
 882         if (!empty($this->rolefilter)) {
 883             $args['role'] = $this->rolefilter;
 884         }
 885         if ($this->searchfilter !== '') {
 886             $args['search'] = $this->searchfilter;
 887         }
 888         if (!empty($this->groupfilter)) {
 889             $args['group'] = $this->groupfilter;
 890         }
 891         if ($this->statusfilter !== -1) {
 892             $args['status'] = $this->statusfilter;
 893         }
 894         return $args;
 895     }
 896
 897     /**
 898      * Returns the course this object is managing enrolments for
 899      *
 900      * @return stdClass
 901      */
 902     public function get_course() {
 903         return $this->course;
 904     }
 905
 906     /**
 907      * Returns the course context
 908      *
 909      * @return stdClass
 910      */
 911     public function get_context() {
 912         return $this->context;
 913     }
 914
 915     /**
 916      * Gets an array of other users in this course ready for display.
 917      *
 918      * Other users are users who have been assigned or inherited roles within this
 919      * course but have not been enrolled.
 920      *
 921      * @param core_enrol_renderer $renderer
 922      * @param moodle_url $pageurl
 923      * @param string $sort
 924      * @param string $direction ASC | DESC
 925      * @param int $page Starting from 0
 926      * @param int $perpage
 927      * @return array
 928      */
 929     public function get_other_users_for_display(core_enrol_renderer $renderer, moodle_url $pageurl, $sort, $direction, $page, $perpage) {
 930
 931         $userroles = $this->get_other_users($sort, $direction, $page, $perpage);
 932         $roles = $this->get_all_roles();
 933         $plugins = $this->get_enrolment_plugins(false);
 934
 935         $context    = $this->get_context();
 936         $now = time();
 937         $extrafields = get_extra_user_fields($context);
 938
 939         $users = array();
 940         foreach ($userroles as $userrole) {
 941             $contextid = $userrole->contextid;
 942             unset($userrole->contextid); // This would collide with user avatar.
 943             if (!array_key_exists($userrole->id, $users)) {
 944                 $users[$userrole->id] = $this->prepare_user_for_display($userrole, $extrafields, $now);
 945             }
 946             $a = new stdClass;
 947             $a->role = $roles[$userrole->roleid]->localname;
 948             if ($contextid == $this->context->id) {
 949                 $changeable = true;
 950                 if ($userrole->component) {
 951                     $changeable = false;
 952                     if (strpos($userrole->component, 'enrol_') === 0) {
 953                         $plugin = substr($userrole->component, 6);
 954                         if (isset($plugins[$plugin])) {
 955                             $changeable = !$plugins[$plugin]->roles_protected();
 956                         }
 957                     }
 958                 }
 959                 $roletext = get_string('rolefromthiscourse', 'enrol', $a);
 960             } else {
 961                 $changeable = false;
 962                 switch ($userrole->contextlevel) {
 963                     case CONTEXT_COURSE :
 964                         // Meta course
 965                         $roletext = get_string('rolefrommetacourse', 'enrol', $a);
 966                         break;
 967                     case CONTEXT_COURSECAT :
 968                         $roletext = get_string('rolefromcategory', 'enrol', $a);
 969                         break;
 970                     case CONTEXT_SYSTEM:
 971                     default:
 972                         $roletext = get_string('rolefromsystem', 'enrol', $a);
 973                         break;
 974                 }
 975             }
 976             if (!isset($users[$userrole->id]['roles'])) {
 977                 $users[$userrole->id]['roles'] = array();
 978             }
 979             $users[$userrole->id]['roles'][$userrole->roleid] = array(
 980                 'text' => $roletext,
 981                 'unchangeable' => !$changeable
 982             );
 983         }
 984         return $users;
 985     }
 986
 987     /**
 988      * Gets an array of users for display, this includes minimal user information
 989      * as well as minimal information on the users roles, groups, and enrolments.
 990      *
 991      * @param core_enrol_renderer $renderer
 992      * @param moodle_url $pageurl
 993      * @param int $sort
 994      * @param string $direction ASC or DESC
 995      * @param int $page
 996      * @param int $perpage
 997      * @return array
 998      */
 999     public function get_users_for_display(course_enrolment_manager $manager, $sort, $direction, $page, $perpage) {
1000         $pageurl = $manager->get_moodlepage()->url;
1001         $users = $this->get_users($sort, $direction, $page, $perpage);
1002
1003         $now = time();
1004         $straddgroup = get_string('addgroup', 'group');
1005         $strunenrol = get_string('unenrol', 'enrol');
1006         $stredit = get_string('edit');
1007
1008         $allroles   = $this->get_all_roles();
1009         $assignable = $this->get_assignable_roles();
1010         $allgroups  = $this->get_all_groups();
1011         $context    = $this->get_context();
1012         $canmanagegroups = has_capability('moodle/course:managegroups', $context);
1013
1014         $url = new moodle_url($pageurl, $this->get_url_params());
1015         $extrafields = get_extra_user_fields($context);
1016
1017         $enabledplugins = $this->get_enrolment_plugins(true);
1018
1019         $userdetails = array();
1020         foreach ($users as $user) {
1021             $details = $this->prepare_user_for_display($user, $extrafields, $now);
1022
1023             // Roles
1024             $details['roles'] = array();
1025             foreach ($this->get_user_roles($user->id) as $rid=>$rassignable) {
1026                 $unchangeable = !$rassignable;
1027                 if (!is_siteadmin() and !isset($assignable[$rid])) {
1028                     $unchangeable = true;
1029                 }
1030                 $details['roles'][$rid] = array('text'=>$allroles[$rid]->localname, 'unchangeable'=>$unchangeable);
1031             }
1032
1033             // Users
1034             $usergroups = $this->get_user_groups($user->id);
1035             $details['groups'] = array();
1036             foreach($usergroups as $gid=>$unused) {
1037                 $details['groups'][$gid] = $allgroups[$gid]->name;
1038             }
1039
1040             // Enrolments
1041             $details['enrolments'] = array();
1042             foreach ($this->get_user_enrolments($user->id) as $ue) {
1043                 if (!isset($enabledplugins[$ue->enrolmentinstance->enrol])) {
1044                     $details['enrolments'][$ue->id] = array(
1045                         'text' => $ue->enrolmentinstancename,
1046                         'period' => null,
1047                         'dimmed' =>  true,
1048                         'actions' => array()
1049                     );
1050                     continue;
1051                 } else if ($ue->timestart and $ue->timeend) {
1052                     $period = get_string('periodstartend', 'enrol', array('start'=>userdate($ue->timestart), 'end'=>userdate($ue->timeend)));
1053                     $periodoutside = ($ue->timestart && $ue->timeend && ($now < $ue->timestart || $now > $ue->timeend));
1054                 } else if ($ue->timestart) {
1055                     $period = get_string('periodstart', 'enrol', userdate($ue->timestart));
1056                     $periodoutside = ($ue->timestart && $now < $ue->timestart);
1057                 } else if ($ue->timeend) {
1058                     $period = get_string('periodend', 'enrol', userdate($ue->timeend));
1059                     $periodoutside = ($ue->timeend && $now > $ue->timeend);
1060                 } else {
1061                     // If there is no start or end show when user was enrolled.
1062                     $period = get_string('periodnone', 'enrol', userdate($ue->timecreated));
1063                     $periodoutside = false;
1064                 }
1065                 $details['enrolments'][$ue->id] = array(
1066                     'text' => $ue->enrolmentinstancename,
1067                     'period' => $period,
1068                     'dimmed' =>  ($periodoutside or $ue->status != ENROL_USER_ACTIVE or $ue->enrolmentinstance->status != ENROL_INSTANCE_ENABLED),
1069                     'actions' => $ue->enrolmentplugin->get_user_enrolment_actions($manager, $ue)
1070                 );
1071             }
1072             $userdetails[$user->id] = $details;
1073         }
1074         return $userdetails;
1075     }
1076
1077     /**
1078      * Prepare a user record for display
1079      *
1080      * This function is called by both {@link get_users_for_display} and {@link get_other_users_for_display} to correctly
1081      * prepare user fields for display
1082      *
1083      * Please note that this function does not check capability for moodle/coures:viewhiddenuserfields
1084      *
1085      * @param object $user The user record
1086      * @param array $extrafields The list of fields as returned from get_extra_user_fields used to determine which
1087      * additional fields may be displayed
1088      * @param int $now The time used for lastaccess calculation
1089      * @return array The fields to be displayed including userid, courseid, picture, firstname, lastseen and any
1090      * additional fields from $extrafields
1091      */
1092     private function prepare_user_for_display($user, $extrafields, $now) {
1093         $details = array(
1094             'userid'           => $user->id,
1095             'courseid'         => $this->get_course()->id,
1096             'picture'          => new user_picture($user),
1097             'firstname'        => fullname($user, has_capability('moodle/site:viewfullnames', $this->get_context())),
1098             'lastseen'         => get_string('never'),
1099             'lastcourseaccess' => get_string('never'),
1100         );
1101         foreach ($extrafields as $field) {
1102             $details[$field] = $user->{$field};
1103         }
1104
1105         // Last time user has accessed the site.
1106         if ($user->lastaccess) {
1107             $details['lastseen'] = format_time($now - $user->lastaccess);
1108         }
1109
1110         // Last time user has accessed the course.
1111         if ($user->lastseen) {
1112             $details['lastcourseaccess'] = format_time($now - $user->lastseen);
1113         }
1114         return $details;
1115     }
1116
1117     public function get_manual_enrol_buttons() {
1118         $plugins = $this->get_enrolment_plugins(true); // Skip disabled plugins.
1119         $buttons = array();
1120         foreach ($plugins as $plugin) {
1121             $newbutton = $plugin->get_manual_enrol_button($this);
1122             if (is_array($newbutton)) {
1123                 $buttons += $newbutton;
1124             } else if ($newbutton instanceof enrol_user_button) {
1125                 $buttons[] = $newbutton;
1126             }
1127         }
1128         return $buttons;
1129     }
1130
1131     public function has_instance($enrolpluginname) {
1132         // Make sure manual enrolments instance exists
1133         foreach ($this->get_enrolment_instances() as $instance) {
1134             if ($instance->enrol == $enrolpluginname) {
1135                 return true;
1136             }
1137         }
1138         return false;
1139     }
1140
1141     /**
1142      * Returns the enrolment plugin that the course manager was being filtered to.
1143      *
1144      * If no filter was being applied then this function returns false.
1145      *
1146      * @return enrol_plugin
1147      */
1148     public function get_filtered_enrolment_plugin() {
1149         $instances = $this->get_enrolment_instances();
1150         $plugins = $this->get_enrolment_plugins(false);
1151
1152         if (empty($this->instancefilter) || !array_key_exists($this->instancefilter, $instances)) {
1153             return false;
1154         }
1155
1156         $instance = $instances[$this->instancefilter];
1157         return $plugins[$instance->enrol];
1158     }
1159
1160     /**
1161      * Returns and array of users + enrolment details.
1162      *
1163      * Given an array of user id's this function returns and array of user enrolments for those users
1164      * as well as enough user information to display the users name and picture for each enrolment.
1165      *
1166      * @global moodle_database $DB
1167      * @param array $userids
1168      * @return array
1169      */
1170     public function get_users_enrolments(array $userids) {
1171         global $DB;
1172
1173         $instances = $this->get_enrolment_instances();
1174         $plugins = $this->get_enrolment_plugins(false);
1175
1176         if  (!empty($this->instancefilter)) {
1177             $instancesql = ' = :instanceid';
1178             $instanceparams = array('instanceid' => $this->instancefilter);
1179         } else {
1180             list($instancesql, $instanceparams) = $DB->get_in_or_equal(array_keys($instances), SQL_PARAMS_NAMED, 'instanceid0000');
1181         }
1182
1183         $userfields = user_picture::fields('u');
1184         list($idsql, $idparams) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED, 'userid0000');
1185
1186         list($sort, $sortparams) = users_order_by_sql('u');
1187
1188         $sql = "SELECT ue.id AS ueid, ue.status, ue.enrolid, ue.userid, ue.timestart, ue.timeend, ue.modifierid, ue.timecreated, ue.timemodified, $userfields
1189                   FROM {user_enrolments} ue
1190              LEFT JOIN {user} u ON u.id = ue.userid
1191                  WHERE ue.enrolid $instancesql AND
1192                        u.id $idsql
1193               ORDER BY $sort";
1194
1195         $rs = $DB->get_recordset_sql($sql, $idparams + $instanceparams + $sortparams);
1196         $users = array();
1197         foreach ($rs as $ue) {
1198             $user = user_picture::unalias($ue);
1199             $ue->id = $ue->ueid;
1200             unset($ue->ueid);
1201             if (!array_key_exists($user->id, $users)) {
1202                 $user->enrolments = array();
1203                 $users[$user->id] = $user;
1204             }
1205             $ue->enrolmentinstance = $instances[$ue->enrolid];
1206             $ue->enrolmentplugin = $plugins[$ue->enrolmentinstance->enrol];
1207             $users[$user->id]->enrolments[$ue->id] = $ue;
1208         }
1209         $rs->close();
1210         return $users;
1211     }
1212 }
1213
1214 /**
1215  * A button that is used to enrol users in a course
1216  *
1217  * @copyright 2010 Sam Hemelryk
1218  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1219  */
1220 class enrol_user_button extends single_button {
1221
1222     /**
1223      * An array containing JS YUI modules required by this button
1224      * @var array
1225      */
1226     protected $jsyuimodules = array();
1227
1228     /**
1229      * An array containing JS initialisation calls required by this button
1230      * @var array
1231      */
1232     protected $jsinitcalls = array();
1233
1234     /**
1235      * An array strings required by JS for this button
1236      * @var array
1237      */
1238     protected $jsstrings = array();
1239
1240     /**
1241      * Initialises the new enrol_user_button
1242      *
1243      * @staticvar int $count The number of enrol user buttons already created
1244      * @param moodle_url $url
1245      * @param string $label The text to display in the button
1246      * @param string $method Either post or get
1247      */
1248     public function __construct(moodle_url $url, $label, $method = 'post') {
1249         static $count = 0;
1250         $count ++;
1251         parent::__construct($url, $label, $method);
1252         $this->class = 'singlebutton enrolusersbutton';
1253         $this->formid = 'enrolusersbutton-'.$count;
1254     }
1255
1256     /**
1257      * Adds a YUI module call that will be added to the page when the button is used.
1258      *
1259      * @param string|array $modules One or more modules to require
1260      * @param string $function The JS function to call
1261      * @param array $arguments An array of arguments to pass to the function
1262      * @param string $galleryversion Deprecated: The gallery version to use
1263      * @param bool $ondomready If true the call is postponed until the DOM is finished loading
1264      */
1265     public function require_yui_module($modules, $function, array $arguments = null, $galleryversion = null, $ondomready = false) {
1266         if ($galleryversion != null) {
1267             debugging('The galleryversion parameter to yui_module has been deprecated since Moodle 2.3.', DEBUG_DEVELOPER);
1268         }
1269
1270         $js = new stdClass;
1271         $js->modules = (array)$modules;
1272         $js->function = $function;
1273         $js->arguments = $arguments;
1274         $js->ondomready = $ondomready;
1275         $this->jsyuimodules[] = $js;
1276     }
1277
1278     /**
1279      * Adds a JS initialisation call to the page when the button is used.
1280      *
1281      * @param string $function The function to call
1282      * @param array $extraarguments An array of arguments to pass to the function
1283      * @param bool $ondomready If true the call is postponed until the DOM is finished loading
1284      * @param array $module A module definition
1285      */
1286     public function require_js_init_call($function, array $extraarguments = null, $ondomready = false, array $module = null) {
1287         $js = new stdClass;
1288         $js->function = $function;
1289         $js->extraarguments = $extraarguments;
1290         $js->ondomready = $ondomready;
1291         $js->module = $module;
1292         $this->jsinitcalls[] = $js;
1293     }
1294
1295     /**
1296      * Requires strings for JS that will be loaded when the button is used.
1297      *
1298      * @param type $identifiers
1299      * @param string $component
1300      * @param mixed $a
1301      */
1302     public function strings_for_js($identifiers, $component = 'moodle', $a = null) {
1303         $string = new stdClass;
1304         $string->identifiers = (array)$identifiers;
1305         $string->component = $component;
1306         $string->a = $a;
1307         $this->jsstrings[] = $string;
1308     }
1309
1310     /**
1311      * Initialises the JS that is required by this button
1312      *
1313      * @param moodle_page $page
1314      */
1315     public function initialise_js(moodle_page $page) {
1316         foreach ($this->jsyuimodules as $js) {
1317             $page->requires->yui_module($js->modules, $js->function, $js->arguments, null, $js->ondomready);
1318         }
1319         foreach ($this->jsinitcalls as $js) {
1320             $page->requires->js_init_call($js->function, $js->extraarguments, $js->ondomready, $js->module);
1321         }
1322         foreach ($this->jsstrings as $string) {
1323             $page->requires->strings_for_js($string->identifiers, $string->component, $string->a);
1324         }
1325     }
1326 }
1327
1328 /**
1329  * User enrolment action
1330  *
1331  * This class is used to manage a renderable ue action such as editing an user enrolment or deleting
1332  * a user enrolment.
1333  *
1334  * @copyright  2011 Sam Hemelryk
1335  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1336  */
1337 class user_enrolment_action implements renderable {
1338
1339     /**
1340      * The icon to display for the action
1341      * @var pix_icon
1342      */
1343     protected $icon;
1344
1345     /**
1346      * The title for the action
1347      * @var string
1348      */
1349     protected $title;
1350
1351     /**
1352      * The URL to the action
1353      * @var moodle_url
1354      */
1355     protected $url;
1356
1357     /**
1358      * An array of HTML attributes
1359      * @var array
1360      */
1361     protected $attributes = array();
1362
1363     /**
1364      * Constructor
1365      * @param pix_icon $icon
1366      * @param string $title
1367      * @param moodle_url $url
1368      * @param array $attributes
1369      */
1370     public function __construct(pix_icon $icon, $title, $url, array $attributes = null) {
1371         $this->icon = $icon;
1372         $this->title = $title;
1373         $this->url = new moodle_url($url);
1374         if (!empty($attributes)) {
1375             $this->attributes = $attributes;
1376         }
1377         $this->attributes['title'] = $title;
1378     }
1379
1380     /**
1381      * Returns the icon for this action
1382      * @return pix_icon
1383      */
1384     public function get_icon() {
1385         return $this->icon;
1386     }
1387
1388     /**
1389      * Returns the title for this action
1390      * @return string
1391      */
1392     public function get_title() {
1393         return $this->title;
1394     }
1395
1396     /**
1397      * Returns the URL for this action
1398      * @return moodle_url
1399      */
1400     public function get_url() {
1401         return $this->url;
1402     }
1403
1404     /**
1405      * Returns the attributes to use for this action
1406      * @return array
1407      */
1408     public function get_attributes() {
1409         return $this->attributes;
1410     }
1411 }
1412
1413 class enrol_ajax_exception extends moodle_exception {
1414     /**
1415      * Constructor
1416      * @param string $errorcode The name of the string from error.php to print
1417      * @param string $module name of module
1418      * @param string $link The url where the user will be prompted to continue. If no url is provided the user will be directed to the site index page.
1419      * @param object $a Extra words and phrases that might be required in the error string
1420      * @param string $debuginfo optional debugging information
1421      */
1422     public function __construct($errorcode, $link = '', $a = NULL, $debuginfo = null) {
1423         parent::__construct($errorcode, 'enrol', $link, $a, $debuginfo);
1424     }
1425 }
1426
1427 /**
1428  * This class is used to manage a bulk operations for enrolment plugins.
1429  *
1430  * @copyright 2011 Sam Hemelryk
1431  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1432  */
1433 abstract class enrol_bulk_enrolment_operation {
1434
1435     /**
1436      * The course enrolment manager
1437      * @var course_enrolment_manager
1438      */
1439     protected $manager;
1440
1441     /**
1442      * The enrolment plugin to which this operation belongs
1443      * @var enrol_plugin
1444      */
1445     protected $plugin;
1446
1447     /**
1448      * Contructor
1449      * @param course_enrolment_manager $manager
1450      * @param stdClass $plugin
1451      */
1452     public function __construct(course_enrolment_manager $manager, enrol_plugin $plugin = null) {
1453         $this->manager = $manager;
1454         $this->plugin = $plugin;
1455     }
1456
1457     /**
1458      * Returns a moodleform used for this operation, or false if no form is required and the action
1459      * should be immediatly processed.
1460      *
1461      * @param moodle_url|string $defaultaction
1462      * @param mixed $defaultcustomdata
1463      * @return enrol_bulk_enrolment_change_form|moodleform|false
1464      */
1465     public function get_form($defaultaction = null, $defaultcustomdata = null) {
1466         return false;
1467     }
1468
1469     /**
1470      * Returns the title to use for this bulk operation
1471      *
1472      * @return string
1473      */
1474     abstract public function get_title();
1475
1476     /**
1477      * Returns the identifier for this bulk operation.
1478      * This should be the same identifier used by the plugins function when returning
1479      * all of its bulk operations.
1480      *
1481      * @return string
1482      */
1483     abstract public function get_identifier();
1484
1485     /**
1486      * Processes the bulk operation on the given users
1487      *
1488      * @param course_enrolment_manager $manager
1489      * @param array $users
1490      * @param stdClass $properties
1491      */
1492     abstract public function process(course_enrolment_manager $manager, array $users, stdClass $properties);
1493 }