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     /**
  66      * The total number of users enrolled in the course
  67      * Populated by course_enrolment_manager::get_total_users
  68      * @var int
  69      */
  70     protected $totalusers = null;
  71     /**
  72      * An array of users currently enrolled in the course
  73      * Populated by course_enrolment_manager::get_users
  74      * @var array
  75      */
  76     protected $users = array();
  77
  78     /**
  79      * An array of users who have roles within this course but who have not
  80      * been enrolled in the course
  81      * @var array
  82      */
  83     protected $otherusers = array();
  84
  85     /**
  86      * The total number of users who hold a role within the course but who
  87      * arn't enrolled.
  88      * @var int
  89      */
  90     protected $totalotherusers = null;
  91
  92     /**
  93      * The current moodle_page object
  94      * @var moodle_page
  95      */
  96     protected $moodlepage = null;
  97
  98     /**#@+
  99      * These variables are used to cache the information this class uses
 100      * please never use these directly instead use their get_ counterparts.
 101      * @access private
 102      * @var array
 103      */
 104     private $_instancessql = null;
 105     private $_instances = null;
 106     private $_inames = null;
 107     private $_plugins = null;
 108     private $_allplugins = null;
 109     private $_roles = null;
 110     private $_assignableroles = null;
 111     private $_assignablerolesothers = null;
 112     private $_groups = null;
 113     /**#@-*/
 114
 115     /**
 116      * Constructs the course enrolment manager
 117      *
 118      * @param moodle_page $moodlepage
 119      * @param stdClass $course
 120      * @param string $instancefilter
 121      * @param int $rolefilter If non-zero, filters to users with specified role
 122      * @param string $searchfilter If non-blank, filters to users with search text
 123      */
 124     public function __construct(moodle_page $moodlepage, $course, $instancefilter = null,
 125             $rolefilter = 0, $searchfilter = '') {
 126         $this->moodlepage = $moodlepage;
 127         $this->context = context_course::instance($course->id);
 128         $this->course = $course;
 129         $this->instancefilter = $instancefilter;
 130         $this->rolefilter = $rolefilter;
 131         $this->searchfilter = $searchfilter;
 132     }
 133
 134     /**
 135      * Returns the current moodle page
 136      * @return moodle_page
 137      */
 138     public function get_moodlepage() {
 139         return $this->moodlepage;
 140     }
 141
 142     /**
 143      * Returns the total number of enrolled users in the course.
 144      *
 145      * If a filter was specificed this will be the total number of users enrolled
 146      * in this course by means of that instance.
 147      *
 148      * @global moodle_database $DB
 149      * @return int
 150      */
 151     public function get_total_users() {
 152         global $DB;
 153         if ($this->totalusers === null) {
 154             list($instancessql, $params, $filter) = $this->get_instance_sql();
 155             list($filtersql, $moreparams) = $this->get_filter_sql();
 156             $params += $moreparams;
 157             $sqltotal = "SELECT COUNT(DISTINCT u.id)
 158                            FROM {user} u
 159                            JOIN {user_enrolments} ue ON (ue.userid = u.id  AND ue.enrolid $instancessql)
 160                            JOIN {enrol} e ON (e.id = ue.enrolid)
 161                           WHERE $filtersql";
 162             $this->totalusers = (int)$DB->count_records_sql($sqltotal, $params);
 163         }
 164         return $this->totalusers;
 165     }
 166
 167     /**
 168      * Returns the total number of enrolled users in the course.
 169      *
 170      * If a filter was specificed this will be the total number of users enrolled
 171      * in this course by means of that instance.
 172      *
 173      * @global moodle_database $DB
 174      * @return int
 175      */
 176     public function get_total_other_users() {
 177         global $DB;
 178         if ($this->totalotherusers === null) {
 179             list($ctxcondition, $params) = $DB->get_in_or_equal(get_parent_contexts($this->context, true), SQL_PARAMS_NAMED, 'ctx');
 180             $params['courseid'] = $this->course->id;
 181             $sql = "SELECT COUNT(DISTINCT u.id)
 182                       FROM {role_assignments} ra
 183                       JOIN {user} u ON u.id = ra.userid
 184                       JOIN {context} ctx ON ra.contextid = ctx.id
 185                  LEFT JOIN (
 186                            SELECT ue.id, ue.userid
 187                              FROM {user_enrolments} ue
 188                         LEFT JOIN {enrol} e ON e.id=ue.enrolid
 189                             WHERE e.courseid = :courseid
 190                          ) ue ON ue.userid=u.id
 191                      WHERE ctx.id $ctxcondition AND
 192                            ue.id IS NULL";
 193             $this->totalotherusers = (int)$DB->count_records_sql($sql, $params);
 194         }
 195         return $this->totalotherusers;
 196     }
 197
 198     /**
 199      * Gets all of the users enrolled in this course.
 200      *
 201      * If a filter was specified this will be the users who were enrolled
 202      * in this course by means of that instance. If role or search filters were
 203      * specified then these will also be applied.
 204      *
 205      * @global moodle_database $DB
 206      * @param string $sort
 207      * @param string $direction ASC or DESC
 208      * @param int $page First page should be 0
 209      * @param int $perpage Defaults to 25
 210      * @return array
 211      */
 212     public function get_users($sort, $direction='ASC', $page=0, $perpage=25) {
 213         global $DB;
 214         if ($direction !== 'ASC') {
 215             $direction = 'DESC';
 216         }
 217         $key = md5("$sort-$direction-$page-$perpage");
 218         if (!array_key_exists($key, $this->users)) {
 219             list($instancessql, $params, $filter) = $this->get_instance_sql();
 220             list($filtersql, $moreparams) = $this->get_filter_sql();
 221             $params += $moreparams;
 222             $extrafields = get_extra_user_fields($this->get_context());
 223             $extrafields[] = 'lastaccess';
 224             $ufields = user_picture::fields('u', $extrafields);
 225             $sql = "SELECT DISTINCT $ufields, ul.timeaccess AS lastseen
 226                       FROM {user} u
 227                       JOIN {user_enrolments} ue ON (ue.userid = u.id  AND ue.enrolid $instancessql)
 228                       JOIN {enrol} e ON (e.id = ue.enrolid)
 229                  LEFT JOIN {user_lastaccess} ul ON (ul.courseid = e.courseid AND ul.userid = u.id)
 230                      WHERE $filtersql";
 231             if ($sort === 'firstname') {
 232                 $sql .= " ORDER BY u.firstname $direction, u.lastname $direction";
 233             } else if ($sort === 'lastname') {
 234                 $sql .= " ORDER BY u.lastname $direction, u.firstname $direction";
 235             } else if ($sort === 'email') {
 236                 $sql .= " ORDER BY u.email $direction, u.lastname $direction, u.firstname $direction";
 237             } else if ($sort === 'lastseen') {
 238                 $sql .= " ORDER BY ul.timeaccess $direction, u.lastname $direction, u.firstname $direction";
 239             }
 240             $this->users[$key] = $DB->get_records_sql($sql, $params, $page*$perpage, $perpage);
 241         }
 242         return $this->users[$key];
 243     }
 244
 245     /**
 246      * Obtains WHERE clause to filter results by defined search and role filter
 247      * (instance filter is handled separately in JOIN clause, see
 248      * get_instance_sql).
 249      *
 250      * @return array Two-element array with SQL and params for WHERE clause
 251      */
 252     protected function get_filter_sql() {
 253         global $DB;
 254
 255         // Search condition.
 256         $extrafields = get_extra_user_fields($this->get_context());
 257         list($sql, $params) = users_search_sql($this->searchfilter, 'u', true, $extrafields);
 258
 259         // Role condition.
 260         if ($this->rolefilter) {
 261             // Get context SQL.
 262             $contextids = $this->context->get_parent_context_ids();
 263             $contextids[] = $this->context->id;
 264             list($contextsql, $contextparams) = $DB->get_in_or_equal($contextids, SQL_PARAMS_NAMED);
 265             $params += $contextparams;
 266
 267             // Role check condition.
 268             $sql .= " AND (SELECT COUNT(1) FROM {role_assignments} ra WHERE ra.userid = u.id " .
 269                     "AND ra.roleid = :roleid AND ra.contextid $contextsql) > 0";
 270             $params['roleid'] = $this->rolefilter;
 271         }
 272
 273         return array($sql, $params);
 274     }
 275
 276     /**
 277      * Gets and array of other users.
 278      *
 279      * Other users are users who have been assigned roles or inherited roles
 280      * within this course but who have not been enrolled in the course
 281      *
 282      * @global moodle_database $DB
 283      * @param string $sort
 284      * @param string $direction
 285      * @param int $page
 286      * @param int $perpage
 287      * @return array
 288      */
 289     public function get_other_users($sort, $direction='ASC', $page=0, $perpage=25) {
 290         global $DB;
 291         if ($direction !== 'ASC') {
 292             $direction = 'DESC';
 293         }
 294         $key = md5("$sort-$direction-$page-$perpage");
 295         if (!array_key_exists($key, $this->otherusers)) {
 296             list($ctxcondition, $params) = $DB->get_in_or_equal(get_parent_contexts($this->context, true), SQL_PARAMS_NAMED, 'ctx');
 297             $params['courseid'] = $this->course->id;
 298             $params['cid'] = $this->course->id;
 299             $sql = "SELECT ra.id as raid, ra.contextid, ra.component, ctx.contextlevel, ra.roleid, u.*, ue.lastseen
 300                     FROM {role_assignments} ra
 301                     JOIN {user} u ON u.id = ra.userid
 302                     JOIN {context} ctx ON ra.contextid = ctx.id
 303                LEFT JOIN (
 304                        SELECT ue.id, ue.userid, ul.timeaccess AS lastseen
 305                          FROM {user_enrolments} ue
 306                     LEFT JOIN {enrol} e ON e.id=ue.enrolid
 307                     LEFT JOIN {user_lastaccess} ul ON (ul.courseid = e.courseid AND ul.userid = ue.userid)
 308                         WHERE e.courseid = :courseid
 309                        ) ue ON ue.userid=u.id
 310                    WHERE ctx.id $ctxcondition AND
 311                          ue.id IS NULL
 312                 ORDER BY u.$sort $direction, ctx.depth DESC";
 313             $this->otherusers[$key] = $DB->get_records_sql($sql, $params, $page*$perpage, $perpage);
 314         }
 315         return $this->otherusers[$key];
 316     }
 317
 318     /**
 319      * Helper method used by {@link get_potential_users()} and {@link search_other_users()}.
 320      *
 321      * @param string $search the search term, if any.
 322      * @param bool $searchanywhere Can the search term be anywhere, or must it be at the start.
 323      * @return array with three elements:
 324      *     string list of fields to SELECT,
 325      *     string contents of SQL WHERE clause,
 326      *     array query params. Note that the SQL snippets use named parameters.
 327      */
 328     protected function get_basic_search_conditions($search, $searchanywhere) {
 329         global $DB, $CFG;
 330
 331         // Add some additional sensible conditions
 332         $tests = array("u.id <> :guestid", 'u.deleted = 0', 'u.confirmed = 1');
 333         $params = array('guestid' => $CFG->siteguest);
 334         if (!empty($search)) {
 335             $conditions = get_extra_user_fields($this->get_context());
 336             $conditions[] = 'u.firstname';
 337             $conditions[] = 'u.lastname';
 338             $conditions[] = $DB->sql_fullname('u.firstname', 'u.lastname');
 339             if ($searchanywhere) {
 340                 $searchparam = '%' . $search . '%';
 341             } else {
 342                 $searchparam = $search . '%';
 343             }
 344             $i = 0;
 345             foreach ($conditions as $key => $condition) {
 346                 $conditions[$key] = $DB->sql_like($condition, ":con{$i}00", false);
 347                 $params["con{$i}00"] = $searchparam;
 348                 $i++;
 349             }
 350             $tests[] = '(' . implode(' OR ', $conditions) . ')';
 351         }
 352         $wherecondition = implode(' AND ', $tests);
 353
 354         $extrafields = get_extra_user_fields($this->get_context(), array('username', 'lastaccess'));
 355         $extrafields[] = 'username';
 356         $extrafields[] = 'lastaccess';
 357         $ufields = user_picture::fields('u', $extrafields);
 358
 359         return array($ufields, $params, $wherecondition);
 360     }
 361
 362     /**
 363      * Helper method used by {@link get_potential_users()} and {@link search_other_users()}.
 364      *
 365      * @param string $search the search string, if any.
 366      * @param string $fields the first bit of the SQL when returning some users.
 367      * @param string $countfields fhe first bit of the SQL when counting the users.
 368      * @param string $sql the bulk of the SQL statement.
 369      * @param array $params query parameters.
 370      * @param int $page which page number of the results to show.
 371      * @param int $perpage number of users per page.
 372      * @param int $addedenrollment number of users added to enrollment.
 373      * @return array with two elememts:
 374      *      int total number of users matching the search.
 375      *      array of user objects returned by the query.
 376      */
 377     protected function execute_search_queries($search, $fields, $countfields, $sql, array $params, $page, $perpage, $addedenrollment=0) {
 378         global $DB, $CFG;
 379
 380         list($sort, $sortparams) = users_order_by_sql('u', $search, $this->get_context());
 381         $order = ' ORDER BY ' . $sort;
 382
 383         $totalusers = $DB->count_records_sql($countfields . $sql, $params);
 384         $availableusers = $DB->get_records_sql($fields . $sql . $order,
 385                 array_merge($params, $sortparams), ($page*$perpage) - $addedenrollment, $perpage);
 386
 387         return array('totalusers' => $totalusers, 'users' => $availableusers);
 388     }
 389
 390     /**
 391      * Gets an array of the users that can be enrolled in this course.
 392      *
 393      * @global moodle_database $DB
 394      * @param int $enrolid
 395      * @param string $search
 396      * @param bool $searchanywhere
 397      * @param int $page Defaults to 0
 398      * @param int $perpage Defaults to 25
 399      * @param int $addedenrollment Defaults to 0
 400      * @return array Array(totalusers => int, users => array)
 401      */
 402     public function get_potential_users($enrolid, $search='', $searchanywhere=false, $page=0, $perpage=25, $addedenrollment=0) {
 403         global $DB;
 404
 405         list($ufields, $params, $wherecondition) = $this->get_basic_search_conditions($search, $searchanywhere);
 406
 407         $fields      = 'SELECT '.$ufields;
 408         $countfields = 'SELECT COUNT(1)';
 409         $sql = " FROM {user} u
 410             LEFT JOIN {user_enrolments} ue ON (ue.userid = u.id AND ue.enrolid = :enrolid)
 411                 WHERE $wherecondition
 412                       AND ue.id IS NULL";
 413         $params['enrolid'] = $enrolid;
 414
 415         return $this->execute_search_queries($search, $fields, $countfields, $sql, $params, $page, $perpage, $addedenrollment);
 416     }
 417
 418     /**
 419      * Searches other users and returns paginated results
 420      *
 421      * @global moodle_database $DB
 422      * @param string $search
 423      * @param bool $searchanywhere
 424      * @param int $page Starting at 0
 425      * @param int $perpage
 426      * @return array
 427      */
 428     public function search_other_users($search='', $searchanywhere=false, $page=0, $perpage=25) {
 429         global $DB, $CFG;
 430
 431         list($ufields, $params, $wherecondition) = $this->get_basic_search_conditions($search, $searchanywhere);
 432
 433         $fields      = 'SELECT ' . $ufields;
 434         $countfields = 'SELECT COUNT(u.id)';
 435         $sql   = " FROM {user} u
 436               LEFT JOIN {role_assignments} ra ON (ra.userid = u.id AND ra.contextid = :contextid)
 437                   WHERE $wherecondition
 438                     AND ra.id IS NULL";
 439         $params['contextid'] = $this->context->id;
 440
 441         return $this->execute_search_queries($search, $fields, $countfields, $sql, $params, $page, $perpage);
 442     }
 443
 444     /**
 445      * Gets an array containing some SQL to user for when selecting, params for
 446      * that SQL, and the filter that was used in constructing the sql.
 447      *
 448      * @global moodle_database $DB
 449      * @return string
 450      */
 451     protected function get_instance_sql() {
 452         global $DB;
 453         if ($this->_instancessql === null) {
 454             $instances = $this->get_enrolment_instances();
 455             $filter = $this->get_enrolment_filter();
 456             if ($filter && array_key_exists($filter, $instances)) {
 457                 $sql = " = :ifilter";
 458                 $params = array('ifilter'=>$filter);
 459             } else {
 460                 $filter = 0;
 461                 if ($instances) {
 462                     list($sql, $params) = $DB->get_in_or_equal(array_keys($this->get_enrolment_instances()), SQL_PARAMS_NAMED);
 463                 } else {
 464                     // no enabled instances, oops, we should probably say something
 465                     $sql = "= :never";
 466                     $params = array('never'=>-1);
 467                 }
 468             }
 469             $this->instancefilter = $filter;
 470             $this->_instancessql = array($sql, $params, $filter);
 471         }
 472         return $this->_instancessql;
 473     }
 474
 475     /**
 476      * Returns all of the enrolment instances for this course.
 477      *
 478      * NOTE: since 2.4 it includes instances of disabled plugins too.
 479      *
 480      * @return array
 481      */
 482     public function get_enrolment_instances() {
 483         if ($this->_instances === null) {
 484             $this->_instances = enrol_get_instances($this->course->id, false);
 485         }
 486         return $this->_instances;
 487     }
 488
 489     /**
 490      * Returns the names for all of the enrolment instances for this course.
 491      *
 492      * NOTE: since 2.4 it includes instances of disabled plugins too.
 493      *
 494      * @return array
 495      */
 496     public function get_enrolment_instance_names() {
 497         if ($this->_inames === null) {
 498             $instances = $this->get_enrolment_instances();
 499             $plugins = $this->get_enrolment_plugins(false);
 500             foreach ($instances as $key=>$instance) {
 501                 if (!isset($plugins[$instance->enrol])) {
 502                     // weird, some broken stuff in plugin
 503                     unset($instances[$key]);
 504                     continue;
 505                 }
 506                 $this->_inames[$key] = $plugins[$instance->enrol]->get_instance_name($instance);
 507             }
 508         }
 509         return $this->_inames;
 510     }
 511
 512     /**
 513      * Gets all of the enrolment plugins that are active for this course.
 514      *
 515      * @param bool $onlyenabled return only enabled enrol plugins
 516      * @return array
 517      */
 518     public function get_enrolment_plugins($onlyenabled = true) {
 519         if ($this->_plugins === null) {
 520             $this->_plugins = enrol_get_plugins(true);
 521         }
 522
 523         if ($onlyenabled) {
 524             return $this->_plugins;
 525         }
 526
 527         if ($this->_allplugins === null) {
 528             // Make sure we have the same objects in _allplugins and _plugins.
 529             $this->_allplugins = $this->_plugins;
 530             foreach (enrol_get_plugins(false) as $name=>$plugin) {
 531                 if (!isset($this->_allplugins[$name])) {
 532                     $this->_allplugins[$name] = $plugin;
 533                 }
 534             }
 535         }
 536
 537         return $this->_allplugins;
 538     }
 539
 540     /**
 541      * Gets all of the roles this course can contain.
 542      *
 543      * @return array
 544      */
 545     public function get_all_roles() {
 546         if ($this->_roles === null) {
 547             $this->_roles = role_fix_names(get_all_roles($this->context), $this->context);
 548         }
 549         return $this->_roles;
 550     }
 551
 552     /**
 553      * Gets all of the assignable roles for this course.
 554      *
 555      * @return array
 556      */
 557     public function get_assignable_roles($otherusers = false) {
 558         if ($this->_assignableroles === null) {
 559             $this->_assignableroles = get_assignable_roles($this->context, ROLENAME_ALIAS, false); // verifies unassign access control too
 560         }
 561
 562         if ($otherusers) {
 563             if (!is_array($this->_assignablerolesothers)) {
 564                 $this->_assignablerolesothers = array();
 565                 list($courseviewroles, $ignored) = get_roles_with_cap_in_context($this->context, 'moodle/course:view');
 566                 foreach ($this->_assignableroles as $roleid=>$role) {
 567                     if (isset($courseviewroles[$roleid])) {
 568                         $this->_assignablerolesothers[$roleid] = $role;
 569                     }
 570                 }
 571             }
 572             return $this->_assignablerolesothers;
 573         } else {
 574             return $this->_assignableroles;
 575         }
 576     }
 577
 578     /**
 579      * Gets all of the groups for this course.
 580      *
 581      * @return array
 582      */
 583     public function get_all_groups() {
 584         if ($this->_groups === null) {
 585             $this->_groups = groups_get_all_groups($this->course->id);
 586             foreach ($this->_groups as $gid=>$group) {
 587                 $this->_groups[$gid]->name = format_string($group->name);
 588             }
 589         }
 590         return $this->_groups;
 591     }
 592
 593     /**
 594      * Unenrols a user from the course given the users ue entry
 595      *
 596      * @global moodle_database $DB
 597      * @param stdClass $ue
 598      * @return bool
 599      */
 600     public function unenrol_user($ue) {
 601         global $DB;
 602         list ($instance, $plugin) = $this->get_user_enrolment_components($ue);
 603         if ($instance && $plugin && $plugin->allow_unenrol_user($instance, $ue) && has_capability("enrol/$instance->enrol:unenrol", $this->context)) {
 604             $plugin->unenrol_user($instance, $ue->userid);
 605             return true;
 606         }
 607         return false;
 608     }
 609
 610     /**
 611      * Given a user enrolment record this method returns the plugin and enrolment
 612      * instance that relate to it.
 613      *
 614      * @param stdClass|int $userenrolment
 615      * @return array array($instance, $plugin)
 616      */
 617     public function get_user_enrolment_components($userenrolment) {
 618         global $DB;
 619         if (is_numeric($userenrolment)) {
 620             $userenrolment = $DB->get_record('user_enrolments', array('id'=>(int)$userenrolment));
 621         }
 622         $instances = $this->get_enrolment_instances();
 623         $plugins = $this->get_enrolment_plugins(false);
 624         if (!$userenrolment || !isset($instances[$userenrolment->enrolid])) {
 625             return array(false, false);
 626         }
 627         $instance = $instances[$userenrolment->enrolid];
 628         $plugin = $plugins[$instance->enrol];
 629         return array($instance, $plugin);
 630     }
 631
 632     /**
 633      * Removes an assigned role from a user.
 634      *
 635      * @global moodle_database $DB
 636      * @param int $userid
 637      * @param int $roleid
 638      * @return bool
 639      */
 640     public function unassign_role_from_user($userid, $roleid) {
 641         global $DB;
 642         // Admins may unassign any role, others only those they could assign.
 643         if (!is_siteadmin() and !array_key_exists($roleid, $this->get_assignable_roles())) {
 644             if (defined('AJAX_SCRIPT')) {
 645                 throw new moodle_exception('invalidrole');
 646             }
 647             return false;
 648         }
 649         $user = $DB->get_record('user', array('id'=>$userid), '*', MUST_EXIST);
 650         $ras = $DB->get_records('role_assignments', array('contextid'=>$this->context->id, 'userid'=>$user->id, 'roleid'=>$roleid));
 651         foreach ($ras as $ra) {
 652             if ($ra->component) {
 653                 if (strpos($ra->component, 'enrol_') !== 0) {
 654                     continue;
 655                 }
 656                 if (!$plugin = enrol_get_plugin(substr($ra->component, 6))) {
 657                     continue;
 658                 }
 659                 if ($plugin->roles_protected()) {
 660                     continue;
 661                 }
 662             }
 663             role_unassign($ra->roleid, $ra->userid, $ra->contextid, $ra->component, $ra->itemid);
 664         }
 665         return true;
 666     }
 667
 668     /**
 669      * Assigns a role to a user.
 670      *
 671      * @param int $roleid
 672      * @param int $userid
 673      * @return int|false
 674      */
 675     public function assign_role_to_user($roleid, $userid) {
 676         require_capability('moodle/role:assign', $this->context);
 677         if (!array_key_exists($roleid, $this->get_assignable_roles())) {
 678             if (defined('AJAX_SCRIPT')) {
 679                 throw new moodle_exception('invalidrole');
 680             }
 681             return false;
 682         }
 683         return role_assign($roleid, $userid, $this->context->id, '', NULL);
 684     }
 685
 686     /**
 687      * Adds a user to a group
 688      *
 689      * @param stdClass $user
 690      * @param int $groupid
 691      * @return bool
 692      */
 693     public function add_user_to_group($user, $groupid) {
 694         require_capability('moodle/course:managegroups', $this->context);
 695         $group = $this->get_group($groupid);
 696         if (!$group) {
 697             return false;
 698         }
 699         return groups_add_member($group->id, $user->id);
 700     }
 701
 702     /**
 703      * Removes a user from a group
 704      *
 705      * @global moodle_database $DB
 706      * @param StdClass $user
 707      * @param int $groupid
 708      * @return bool
 709      */
 710     public function remove_user_from_group($user, $groupid) {
 711         global $DB;
 712         require_capability('moodle/course:managegroups', $this->context);
 713         $group = $this->get_group($groupid);
 714         if (!groups_remove_member_allowed($group, $user)) {
 715             return false;
 716         }
 717         if (!$group) {
 718             return false;
 719         }
 720         return groups_remove_member($group, $user);
 721     }
 722
 723     /**
 724      * Gets the requested group
 725      *
 726      * @param int $groupid
 727      * @return stdClass|int
 728      */
 729     public function get_group($groupid) {
 730         $groups = $this->get_all_groups();
 731         if (!array_key_exists($groupid, $groups)) {
 732             return false;
 733         }
 734         return $groups[$groupid];
 735     }
 736
 737     /**
 738      * Edits an enrolment
 739      *
 740      * @param stdClass $userenrolment
 741      * @param stdClass $data
 742      * @return bool
 743      */
 744     public function edit_enrolment($userenrolment, $data) {
 745         //Only allow editing if the user has the appropriate capability
 746         //Already checked in /enrol/users.php but checking again in case this function is called from elsewhere
 747         list($instance, $plugin) = $this->get_user_enrolment_components($userenrolment);
 748         if ($instance && $plugin && $plugin->allow_manage($instance) && has_capability("enrol/$instance->enrol:manage", $this->context)) {
 749             if (!isset($data->status)) {
 750                 $data->status = $userenrolment->status;
 751             }
 752             $plugin->update_user_enrol($instance, $userenrolment->userid, $data->status, $data->timestart, $data->timeend);
 753             return true;
 754         }
 755         return false;
 756     }
 757
 758     /**
 759      * Returns the current enrolment filter that is being applied by this class
 760      * @return string
 761      */
 762     public function get_enrolment_filter() {
 763         return $this->instancefilter;
 764     }
 765
 766     /**
 767      * Gets the roles assigned to this user that are applicable for this course.
 768      *
 769      * @param int $userid
 770      * @return array
 771      */
 772     public function get_user_roles($userid) {
 773         $roles = array();
 774         $ras = get_user_roles($this->context, $userid, true, 'c.contextlevel DESC, r.sortorder ASC');
 775         $plugins = $this->get_enrolment_plugins(false);
 776         foreach ($ras as $ra) {
 777             if ($ra->contextid != $this->context->id) {
 778                 if (!array_key_exists($ra->roleid, $roles)) {
 779                     $roles[$ra->roleid] = null;
 780                 }
 781                 // higher ras, course always takes precedence
 782                 continue;
 783             }
 784             if (array_key_exists($ra->roleid, $roles) && $roles[$ra->roleid] === false) {
 785                 continue;
 786             }
 787             $changeable = true;
 788             if ($ra->component) {
 789                 $changeable = false;
 790                 if (strpos($ra->component, 'enrol_') === 0) {
 791                     $plugin = substr($ra->component, 6);
 792                     if (isset($plugins[$plugin])) {
 793                         $changeable = !$plugins[$plugin]->roles_protected();
 794                     }
 795                 }
 796             }
 797
 798             $roles[$ra->roleid] = $changeable;
 799         }
 800         return $roles;
 801     }
 802
 803     /**
 804      * Gets the enrolments this user has in the course - including all suspended plugins and instances.
 805      *
 806      * @global moodle_database $DB
 807      * @param int $userid
 808      * @return array
 809      */
 810     public function get_user_enrolments($userid) {
 811         global $DB;
 812         list($instancessql, $params, $filter) = $this->get_instance_sql();
 813         $params['userid'] = $userid;
 814         $userenrolments = $DB->get_records_select('user_enrolments', "enrolid $instancessql AND userid = :userid", $params);
 815         $instances = $this->get_enrolment_instances();
 816         $plugins = $this->get_enrolment_plugins(false);
 817         $inames = $this->get_enrolment_instance_names();
 818         foreach ($userenrolments as &$ue) {
 819             $ue->enrolmentinstance     = $instances[$ue->enrolid];
 820             $ue->enrolmentplugin       = $plugins[$ue->enrolmentinstance->enrol];
 821             $ue->enrolmentinstancename = $inames[$ue->enrolmentinstance->id];
 822         }
 823         return $userenrolments;
 824     }
 825
 826     /**
 827      * Gets the groups this user belongs to
 828      *
 829      * @param int $userid
 830      * @return array
 831      */
 832     public function get_user_groups($userid) {
 833         return groups_get_all_groups($this->course->id, $userid, 0, 'g.id');
 834     }
 835
 836     /**
 837      * Retursn an array of params that would go into the URL to return to this
 838      * exact page.
 839      *
 840      * @return array
 841      */
 842     public function get_url_params() {
 843         $args = array(
 844             'id' => $this->course->id
 845         );
 846         if (!empty($this->instancefilter)) {
 847             $args['ifilter'] = $this->instancefilter;
 848         }
 849         if (!empty($this->rolefilter)) {
 850             $args['role'] = $this->rolefilter;
 851         }
 852         if ($this->searchfilter !== '') {
 853             $args['search'] = $this->searchfilter;
 854         }
 855         return $args;
 856     }
 857
 858     /**
 859      * Returns the course this object is managing enrolments for
 860      *
 861      * @return stdClass
 862      */
 863     public function get_course() {
 864         return $this->course;
 865     }
 866
 867     /**
 868      * Returns the course context
 869      *
 870      * @return stdClass
 871      */
 872     public function get_context() {
 873         return $this->context;
 874     }
 875
 876     /**
 877      * Gets an array of other users in this course ready for display.
 878      *
 879      * Other users are users who have been assigned or inherited roles within this
 880      * course but have not been enrolled.
 881      *
 882      * @param core_enrol_renderer $renderer
 883      * @param moodle_url $pageurl
 884      * @param string $sort
 885      * @param string $direction ASC | DESC
 886      * @param int $page Starting from 0
 887      * @param int $perpage
 888      * @return array
 889      */
 890     public function get_other_users_for_display(core_enrol_renderer $renderer, moodle_url $pageurl, $sort, $direction, $page, $perpage) {
 891
 892         $userroles = $this->get_other_users($sort, $direction, $page, $perpage);
 893         $roles = $this->get_all_roles();
 894         $plugins = $this->get_enrolment_plugins(false);
 895
 896         $context    = $this->get_context();
 897         $now = time();
 898         $extrafields = get_extra_user_fields($context);
 899
 900         $users = array();
 901         foreach ($userroles as $userrole) {
 902             $contextid = $userrole->contextid;
 903             unset($userrole->contextid); // This would collide with user avatar.
 904             if (!array_key_exists($userrole->id, $users)) {
 905                 $users[$userrole->id] = $this->prepare_user_for_display($userrole, $extrafields, $now);
 906             }
 907             $a = new stdClass;
 908             $a->role = $roles[$userrole->roleid]->localname;
 909             if ($contextid == $this->context->id) {
 910                 $changeable = true;
 911                 if ($userrole->component) {
 912                     $changeable = false;
 913                     if (strpos($userrole->component, 'enrol_') === 0) {
 914                         $plugin = substr($userrole->component, 6);
 915                         if (isset($plugins[$plugin])) {
 916                             $changeable = !$plugins[$plugin]->roles_protected();
 917                         }
 918                     }
 919                 }
 920                 $roletext = get_string('rolefromthiscourse', 'enrol', $a);
 921             } else {
 922                 $changeable = false;
 923                 switch ($userrole->contextlevel) {
 924                     case CONTEXT_COURSE :
 925                         // Meta course
 926                         $roletext = get_string('rolefrommetacourse', 'enrol', $a);
 927                         break;
 928                     case CONTEXT_COURSECAT :
 929                         $roletext = get_string('rolefromcategory', 'enrol', $a);
 930                         break;
 931                     case CONTEXT_SYSTEM:
 932                     default:
 933                         $roletext = get_string('rolefromsystem', 'enrol', $a);
 934                         break;
 935                 }
 936             }
 937             if (!isset($users[$userrole->id]['roles'])) {
 938                 $users[$userrole->id]['roles'] = array();
 939             }
 940             $users[$userrole->id]['roles'][$userrole->roleid] = array(
 941                 'text' => $roletext,
 942                 'unchangeable' => !$changeable
 943             );
 944         }
 945         return $users;
 946     }
 947
 948     /**
 949      * Gets an array of users for display, this includes minimal user information
 950      * as well as minimal information on the users roles, groups, and enrolments.
 951      *
 952      * @param core_enrol_renderer $renderer
 953      * @param moodle_url $pageurl
 954      * @param int $sort
 955      * @param string $direction ASC or DESC
 956      * @param int $page
 957      * @param int $perpage
 958      * @return array
 959      */
 960     public function get_users_for_display(course_enrolment_manager $manager, $sort, $direction, $page, $perpage) {
 961         $pageurl = $manager->get_moodlepage()->url;
 962         $users = $this->get_users($sort, $direction, $page, $perpage);
 963
 964         $now = time();
 965         $straddgroup = get_string('addgroup', 'group');
 966         $strunenrol = get_string('unenrol', 'enrol');
 967         $stredit = get_string('edit');
 968
 969         $allroles   = $this->get_all_roles();
 970         $assignable = $this->get_assignable_roles();
 971         $allgroups  = $this->get_all_groups();
 972         $context    = $this->get_context();
 973         $canmanagegroups = has_capability('moodle/course:managegroups', $context);
 974
 975         $url = new moodle_url($pageurl, $this->get_url_params());
 976         $extrafields = get_extra_user_fields($context);
 977
 978         $enabledplugins = $this->get_enrolment_plugins(true);
 979
 980         $userdetails = array();
 981         foreach ($users as $user) {
 982             $details = $this->prepare_user_for_display($user, $extrafields, $now);
 983
 984             // Roles
 985             $details['roles'] = array();
 986             foreach ($this->get_user_roles($user->id) as $rid=>$rassignable) {
 987                 $unchangeable = !$rassignable;
 988                 if (!is_siteadmin() and !isset($assignable[$rid])) {
 989                     $unchangeable = true;
 990                 }
 991                 $details['roles'][$rid] = array('text'=>$allroles[$rid]->localname, 'unchangeable'=>$unchangeable);
 992             }
 993
 994             // Users
 995             $usergroups = $this->get_user_groups($user->id);
 996             $details['groups'] = array();
 997             foreach($usergroups as $gid=>$unused) {
 998                 $details['groups'][$gid] = $allgroups[$gid]->name;
 999             }
1000
1001             // Enrolments
1002             $details['enrolments'] = array();
1003             foreach ($this->get_user_enrolments($user->id) as $ue) {
1004                 if (!isset($enabledplugins[$ue->enrolmentinstance->enrol])) {
1005                     $details['enrolments'][$ue->id] = array(
1006                         'text' => $ue->enrolmentinstancename,
1007                         'period' => null,
1008                         'dimmed' =>  true,
1009                         'actions' => array()
1010                     );
1011                     continue;
1012                 } else if ($ue->timestart and $ue->timeend) {
1013                     $period = get_string('periodstartend', 'enrol', array('start'=>userdate($ue->timestart), 'end'=>userdate($ue->timeend)));
1014                     $periodoutside = ($ue->timestart && $ue->timeend && ($now < $ue->timestart || $now > $ue->timeend));
1015                 } else if ($ue->timestart) {
1016                     $period = get_string('periodstart', 'enrol', userdate($ue->timestart));
1017                     $periodoutside = ($ue->timestart && $now < $ue->timestart);
1018                 } else if ($ue->timeend) {
1019                     $period = get_string('periodend', 'enrol', userdate($ue->timeend));
1020                     $periodoutside = ($ue->timeend && $now > $ue->timeend);
1021                 } else {
1022                     // If there is no start or end show when user was enrolled.
1023                     $period = get_string('periodnone', 'enrol', userdate($ue->timecreated));
1024                     $periodoutside = false;
1025                 }
1026                 $details['enrolments'][$ue->id] = array(
1027                     'text' => $ue->enrolmentinstancename,
1028                     'period' => $period,
1029                     'dimmed' =>  ($periodoutside or $ue->status != ENROL_USER_ACTIVE or $ue->enrolmentinstance->status != ENROL_INSTANCE_ENABLED),
1030                     'actions' => $ue->enrolmentplugin->get_user_enrolment_actions($manager, $ue)
1031                 );
1032             }
1033             $userdetails[$user->id] = $details;
1034         }
1035         return $userdetails;
1036     }
1037
1038     /**
1039      * Prepare a user record for display
1040      *
1041      * This function is called by both {@link get_users_for_display} and {@link get_other_users_for_display} to correctly
1042      * prepare user fields for display
1043      *
1044      * Please note that this function does not check capability for moodle/coures:viewhiddenuserfields
1045      *
1046      * @param object $user The user record
1047      * @param array $extrafields The list of fields as returned from get_extra_user_fields used to determine which
1048      * additional fields may be displayed
1049      * @param int $now The time used for lastaccess calculation
1050      * @return array The fields to be displayed including userid, courseid, picture, firstname, lastseen and any
1051      * additional fields from $extrafields
1052      */
1053     private function prepare_user_for_display($user, $extrafields, $now) {
1054         $details = array(
1055             'userid'    => $user->id,
1056             'courseid'  => $this->get_course()->id,
1057             'picture'   => new user_picture($user),
1058             'firstname' => fullname($user, has_capability('moodle/site:viewfullnames', $this->get_context())),
1059             'lastseen'  => get_string('never'),
1060         );
1061         foreach ($extrafields as $field) {
1062             $details[$field] = $user->{$field};
1063         }
1064
1065         if ($user->lastaccess) {
1066             $details['lastseen'] = format_time($now - $user->lastaccess);
1067         }
1068         return $details;
1069     }
1070
1071     public function get_manual_enrol_buttons() {
1072         $plugins = $this->get_enrolment_plugins(true); // Skip disabled plugins.
1073         $buttons = array();
1074         foreach ($plugins as $plugin) {
1075             $newbutton = $plugin->get_manual_enrol_button($this);
1076             if (is_array($newbutton)) {
1077                 $buttons += $newbutton;
1078             } else if ($newbutton instanceof enrol_user_button) {
1079                 $buttons[] = $newbutton;
1080             }
1081         }
1082         return $buttons;
1083     }
1084
1085     public function has_instance($enrolpluginname) {
1086         // Make sure manual enrolments instance exists
1087         foreach ($this->get_enrolment_instances() as $instance) {
1088             if ($instance->enrol == $enrolpluginname) {
1089                 return true;
1090             }
1091         }
1092         return false;
1093     }
1094
1095     /**
1096      * Returns the enrolment plugin that the course manager was being filtered to.
1097      *
1098      * If no filter was being applied then this function returns false.
1099      *
1100      * @return enrol_plugin
1101      */
1102     public function get_filtered_enrolment_plugin() {
1103         $instances = $this->get_enrolment_instances();
1104         $plugins = $this->get_enrolment_plugins(false);
1105
1106         if (empty($this->instancefilter) || !array_key_exists($this->instancefilter, $instances)) {
1107             return false;
1108         }
1109
1110         $instance = $instances[$this->instancefilter];
1111         return $plugins[$instance->enrol];
1112     }
1113
1114     /**
1115      * Returns and array of users + enrolment details.
1116      *
1117      * Given an array of user id's this function returns and array of user enrolments for those users
1118      * as well as enough user information to display the users name and picture for each enrolment.
1119      *
1120      * @global moodle_database $DB
1121      * @param array $userids
1122      * @return array
1123      */
1124     public function get_users_enrolments(array $userids) {
1125         global $DB;
1126
1127         $instances = $this->get_enrolment_instances();
1128         $plugins = $this->get_enrolment_plugins(false);
1129
1130         if  (!empty($this->instancefilter)) {
1131             $instancesql = ' = :instanceid';
1132             $instanceparams = array('instanceid' => $this->instancefilter);
1133         } else {
1134             list($instancesql, $instanceparams) = $DB->get_in_or_equal(array_keys($instances), SQL_PARAMS_NAMED, 'instanceid0000');
1135         }
1136
1137         $userfields = user_picture::fields('u');
1138         list($idsql, $idparams) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED, 'userid0000');
1139
1140         list($sort, $sortparams) = users_order_by_sql('u');
1141
1142         $sql = "SELECT ue.id AS ueid, ue.status, ue.enrolid, ue.userid, ue.timestart, ue.timeend, ue.modifierid, ue.timecreated, ue.timemodified, $userfields
1143                   FROM {user_enrolments} ue
1144              LEFT JOIN {user} u ON u.id = ue.userid
1145                  WHERE ue.enrolid $instancesql AND
1146                        u.id $idsql
1147               ORDER BY $sort";
1148
1149         $rs = $DB->get_recordset_sql($sql, $idparams + $instanceparams + $sortparams);
1150         $users = array();
1151         foreach ($rs as $ue) {
1152             $user = user_picture::unalias($ue);
1153             $ue->id = $ue->ueid;
1154             unset($ue->ueid);
1155             if (!array_key_exists($user->id, $users)) {
1156                 $user->enrolments = array();
1157                 $users[$user->id] = $user;
1158             }
1159             $ue->enrolmentinstance = $instances[$ue->enrolid];
1160             $ue->enrolmentplugin = $plugins[$ue->enrolmentinstance->enrol];
1161             $users[$user->id]->enrolments[$ue->id] = $ue;
1162         }
1163         $rs->close();
1164         return $users;
1165     }
1166 }
1167
1168 /**
1169  * A button that is used to enrol users in a course
1170  *
1171  * @copyright 2010 Sam Hemelryk
1172  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1173  */
1174 class enrol_user_button extends single_button {
1175
1176     /**
1177      * An array containing JS YUI modules required by this button
1178      * @var array
1179      */
1180     protected $jsyuimodules = array();
1181
1182     /**
1183      * An array containing JS initialisation calls required by this button
1184      * @var array
1185      */
1186     protected $jsinitcalls = array();
1187
1188     /**
1189      * An array strings required by JS for this button
1190      * @var array
1191      */
1192     protected $jsstrings = array();
1193
1194     /**
1195      * Initialises the new enrol_user_button
1196      *
1197      * @staticvar int $count The number of enrol user buttons already created
1198      * @param moodle_url $url
1199      * @param string $label The text to display in the button
1200      * @param string $method Either post or get
1201      */
1202     public function __construct(moodle_url $url, $label, $method = 'post') {
1203         static $count = 0;
1204         $count ++;
1205         parent::__construct($url, $label, $method);
1206         $this->class = 'singlebutton enrolusersbutton';
1207         $this->formid = 'enrolusersbutton-'.$count;
1208     }
1209
1210     /**
1211      * Adds a YUI module call that will be added to the page when the button is used.
1212      *
1213      * @param string|array $modules One or more modules to require
1214      * @param string $function The JS function to call
1215      * @param array $arguments An array of arguments to pass to the function
1216      * @param string $galleryversion The YUI gallery version of any modules required
1217      * @param bool $ondomready If true the call is postponed until the DOM is finished loading
1218      */
1219     public function require_yui_module($modules, $function, array $arguments = null, $galleryversion = '2010.04.08-12-35', $ondomready = false) {
1220         $js = new stdClass;
1221         $js->modules = (array)$modules;
1222         $js->function = $function;
1223         $js->arguments = $arguments;
1224         $js->galleryversion = $galleryversion;
1225         $js->ondomready = $ondomready;
1226         $this->jsyuimodules[] = $js;
1227     }
1228
1229     /**
1230      * Adds a JS initialisation call to the page when the button is used.
1231      *
1232      * @param string $function The function to call
1233      * @param array $extraarguments An array of arguments to pass to the function
1234      * @param bool $ondomready If true the call is postponed until the DOM is finished loading
1235      * @param array $module A module definition
1236      */
1237     public function require_js_init_call($function, array $extraarguments = null, $ondomready = false, array $module = null) {
1238         $js = new stdClass;
1239         $js->function = $function;
1240         $js->extraarguments = $extraarguments;
1241         $js->ondomready = $ondomready;
1242         $js->module = $module;
1243         $this->jsinitcalls[] = $js;
1244     }
1245
1246     /**
1247      * Requires strings for JS that will be loaded when the button is used.
1248      *
1249      * @param type $identifiers
1250      * @param string $component
1251      * @param mixed $a
1252      */
1253     public function strings_for_js($identifiers, $component = 'moodle', $a = null) {
1254         $string = new stdClass;
1255         $string->identifiers = (array)$identifiers;
1256         $string->component = $component;
1257         $string->a = $a;
1258         $this->jsstrings[] = $string;
1259     }
1260
1261     /**
1262      * Initialises the JS that is required by this button
1263      *
1264      * @param moodle_page $page
1265      */
1266     public function initialise_js(moodle_page $page) {
1267         foreach ($this->jsyuimodules as $js) {
1268             $page->requires->yui_module($js->modules, $js->function, $js->arguments, $js->galleryversion, $js->ondomready);
1269         }
1270         foreach ($this->jsinitcalls as $js) {
1271             $page->requires->js_init_call($js->function, $js->extraarguments, $js->ondomready, $js->module);
1272         }
1273         foreach ($this->jsstrings as $string) {
1274             $page->requires->strings_for_js($string->identifiers, $string->component, $string->a);
1275         }
1276     }
1277 }
1278
1279 /**
1280  * User enrolment action
1281  *
1282  * This class is used to manage a renderable ue action such as editing an user enrolment or deleting
1283  * a user enrolment.
1284  *
1285  * @copyright  2011 Sam Hemelryk
1286  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1287  */
1288 class user_enrolment_action implements renderable {
1289
1290     /**
1291      * The icon to display for the action
1292      * @var pix_icon
1293      */
1294     protected $icon;
1295
1296     /**
1297      * The title for the action
1298      * @var string
1299      */
1300     protected $title;
1301
1302     /**
1303      * The URL to the action
1304      * @var moodle_url
1305      */
1306     protected $url;
1307
1308     /**
1309      * An array of HTML attributes
1310      * @var array
1311      */
1312     protected $attributes = array();
1313
1314     /**
1315      * Constructor
1316      * @param pix_icon $icon
1317      * @param string $title
1318      * @param moodle_url $url
1319      * @param array $attributes
1320      */
1321     public function __construct(pix_icon $icon, $title, $url, array $attributes = null) {
1322         $this->icon = $icon;
1323         $this->title = $title;
1324         $this->url = new moodle_url($url);
1325         if (!empty($attributes)) {
1326             $this->attributes = $attributes;
1327         }
1328         $this->attributes['title'] = $title;
1329     }
1330
1331     /**
1332      * Returns the icon for this action
1333      * @return pix_icon
1334      */
1335     public function get_icon() {
1336         return $this->icon;
1337     }
1338
1339     /**
1340      * Returns the title for this action
1341      * @return string
1342      */
1343     public function get_title() {
1344         return $this->title;
1345     }
1346
1347     /**
1348      * Returns the URL for this action
1349      * @return moodle_url
1350      */
1351     public function get_url() {
1352         return $this->url;
1353     }
1354
1355     /**
1356      * Returns the attributes to use for this action
1357      * @return array
1358      */
1359     public function get_attributes() {
1360         return $this->attributes;
1361     }
1362 }
1363
1364 class enrol_ajax_exception extends moodle_exception {
1365     /**
1366      * Constructor
1367      * @param string $errorcode The name of the string from error.php to print
1368      * @param string $module name of module
1369      * @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.
1370      * @param object $a Extra words and phrases that might be required in the error string
1371      * @param string $debuginfo optional debugging information
1372      */
1373     public function __construct($errorcode, $link = '', $a = NULL, $debuginfo = null) {
1374         parent::__construct($errorcode, 'enrol', $link, $a, $debuginfo);
1375     }
1376 }
1377
1378 /**
1379  * This class is used to manage a bulk operations for enrolment plugins.
1380  *
1381  * @copyright 2011 Sam Hemelryk
1382  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1383  */
1384 abstract class enrol_bulk_enrolment_operation {
1385
1386     /**
1387      * The course enrolment manager
1388      * @var course_enrolment_manager
1389      */
1390     protected $manager;
1391
1392     /**
1393      * The enrolment plugin to which this operation belongs
1394      * @var enrol_plugin
1395      */
1396     protected $plugin;
1397
1398     /**
1399      * Contructor
1400      * @param course_enrolment_manager $manager
1401      * @param stdClass $plugin
1402      */
1403     public function __construct(course_enrolment_manager $manager, enrol_plugin $plugin = null) {
1404         $this->manager = $manager;
1405         $this->plugin = $plugin;
1406     }
1407
1408     /**
1409      * Returns a moodleform used for this operation, or false if no form is required and the action
1410      * should be immediatly processed.
1411      *
1412      * @param moodle_url|string $defaultaction
1413      * @param mixed $defaultcustomdata
1414      * @return enrol_bulk_enrolment_change_form|moodleform|false
1415      */
1416     public function get_form($defaultaction = null, $defaultcustomdata = null) {
1417         return false;
1418     }
1419
1420     /**
1421      * Returns the title to use for this bulk operation
1422      *
1423      * @return string
1424      */
1425     abstract public function get_title();
1426
1427     /**
1428      * Returns the identifier for this bulk operation.
1429      * This should be the same identifier used by the plugins function when returning
1430      * all of its bulk operations.
1431      *
1432      * @return string
1433      */
1434     abstract public function get_identifier();
1435
1436     /**
1437      * Processes the bulk operation on the given users
1438      *
1439      * @param course_enrolment_manager $manager
1440      * @param array $users
1441      * @param stdClass $properties
1442      */
1443     abstract public function process(course_enrolment_manager $manager, array $users, stdClass $properties);
1444 }