enrol/locallib.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * This file contains the course_enrolment_manager class which is used to interface
  20  * with the functions that exist in enrollib.php in relation to a single course.
  21  *
  22  * @package    core
  23  * @subpackage enrol
  24  * @copyright  2010 Sam Hemelryk
  25  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  26  */
  27
  28 defined('MOODLE_INTERNAL') || die();
  29
  30 /**
  31  * This class provides a targeted tied together means of interfacing the enrolment
  32  * tasks together with a course.
  33  *
  34  * It is provided as a convenience more than anything else.
  35  *
  36  * @copyright 2010 Sam Hemelryk
  37  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  38  */
  39 class course_enrolment_manager {
  40
  41     /**
  42      * The course context
  43      * @var stdClass
  44      */
  45     protected $context;
  46     /**
  47      * The course we are managing enrolments for
  48      * @var stdClass
  49      */
  50     protected $course = null;
  51     /**
  52      * Limits the focus of the manager to one enrolment plugin instance
  53      * @var string
  54      */
  55     protected $instancefilter = null;
  56
  57     /**
  58      * The total number of users enrolled in the course
  59      * Populated by course_enrolment_manager::get_total_users
  60      * @var int
  61      */
  62     protected $totalusers = null;
  63     /**
  64      * An array of users currently enrolled in the course
  65      * Populated by course_enrolment_manager::get_users
  66      * @var array
  67      */
  68     protected $users = array();
  69
  70     /**
  71      * An array of users who have roles within this course but who have not
  72      * been enrolled in the course
  73      * @var array
  74      */
  75     protected $otherusers = array();
  76
  77     /**
  78      * The total number of users who hold a role within the course but who
  79      * arn't enrolled.
  80      * @var int
  81      */
  82     protected $totalotherusers = null;
  83
  84     /**
  85      * The current moodle_page object
  86      * @var moodle_page
  87      */
  88     protected $moodlepage = null;
  89
  90     /**#@+
  91      * These variables are used to cache the information this class uses
  92      * please never use these directly instead use their get_ counterparts.
  93      * @access private
  94      * @var array
  95      */
  96     private $_instancessql = null;
  97     private $_instances = null;
  98     private $_inames = null;
  99     private $_plugins = null;
 100     private $_roles = null;
 101     private $_assignableroles = null;
 102     private $_assignablerolesothers = null;
 103     private $_groups = null;
 104     /**#@-*/
 105
 106     /**
 107      * Constructs the course enrolment manager
 108      *
 109      * @param moodle_page $moodlepage
 110      * @param stdClass $course
 111      * @param string $instancefilter
 112      */
 113     public function __construct(moodle_page $moodlepage, $course, $instancefilter = null) {
 114         $this->moodlepage = $moodlepage;
 115         $this->context = get_context_instance(CONTEXT_COURSE, $course->id);
 116         $this->course = $course;
 117         $this->instancefilter = $instancefilter;
 118     }
 119
 120     /**
 121      * Returns the current moodle page
 122      * @return moodle_page
 123      */
 124     public function get_moodlepage() {
 125         return $this->moodlepage;
 126     }
 127
 128     /**
 129      * Returns the total number of enrolled users in the course.
 130      *
 131      * If a filter was specificed this will be the total number of users enrolled
 132      * in this course by means of that instance.
 133      *
 134      * @global moodle_database $DB
 135      * @return int
 136      */
 137     public function get_total_users() {
 138         global $DB;
 139         if ($this->totalusers === null) {
 140             list($instancessql, $params, $filter) = $this->get_instance_sql();
 141             $sqltotal = "SELECT COUNT(DISTINCT u.id)
 142                            FROM {user} u
 143                            JOIN {user_enrolments} ue ON (ue.userid = u.id  AND ue.enrolid $instancessql)
 144                            JOIN {enrol} e ON (e.id = ue.enrolid)";
 145             $this->totalusers = (int)$DB->count_records_sql($sqltotal, $params);
 146         }
 147         return $this->totalusers;
 148     }
 149
 150     /**
 151      * Returns the total number of enrolled users in the course.
 152      *
 153      * If a filter was specificed this will be the total number of users enrolled
 154      * in this course by means of that instance.
 155      *
 156      * @global moodle_database $DB
 157      * @return int
 158      */
 159     public function get_total_other_users() {
 160         global $DB;
 161         if ($this->totalotherusers === null) {
 162             list($ctxcondition, $params) = $DB->get_in_or_equal(get_parent_contexts($this->context, true), SQL_PARAMS_NAMED, 'ctx');
 163             $params['courseid'] = $this->course->id;
 164             $sql = "SELECT COUNT(DISTINCT u.id)
 165                       FROM {role_assignments} ra
 166                       JOIN {user} u ON u.id = ra.userid
 167                       JOIN {context} ctx ON ra.contextid = ctx.id
 168                  LEFT JOIN (
 169                            SELECT ue.id, ue.userid
 170                              FROM {user_enrolments} ue
 171                         LEFT JOIN {enrol} e ON e.id=ue.enrolid
 172                             WHERE e.courseid = :courseid
 173                          ) ue ON ue.userid=u.id
 174                      WHERE ctx.id $ctxcondition AND
 175                            ue.id IS NULL";
 176             $this->totalotherusers = (int)$DB->count_records_sql($sql, $params);
 177         }
 178         return $this->totalotherusers;
 179     }
 180
 181     /**
 182      * Gets all of the users enrolled in this course.
 183      *
 184      * If a filter was specified this will be the users who were enrolled
 185      * in this course by means of that instance.
 186      *
 187      * @global moodle_database $DB
 188      * @param string $sort
 189      * @param string $direction ASC or DESC
 190      * @param int $page First page should be 0
 191      * @param int $perpage Defaults to 25
 192      * @return array
 193      */
 194     public function get_users($sort, $direction='ASC', $page=0, $perpage=25) {
 195         global $DB;
 196         if ($direction !== 'ASC') {
 197             $direction = 'DESC';
 198         }
 199         $key = md5("$sort-$direction-$page-$perpage");
 200         if (!array_key_exists($key, $this->users)) {
 201             list($instancessql, $params, $filter) = $this->get_instance_sql();
 202             $extrafields = get_extra_user_fields($this->get_context());
 203             $extrafields[] = 'lastaccess';
 204             $ufields = user_picture::fields('u', $extrafields);
 205             $sql = "SELECT DISTINCT $ufields, ul.timeaccess AS lastseen
 206                       FROM {user} u
 207                       JOIN {user_enrolments} ue ON (ue.userid = u.id  AND ue.enrolid $instancessql)
 208                       JOIN {enrol} e ON (e.id = ue.enrolid)
 209                  LEFT JOIN {user_lastaccess} ul ON (ul.courseid = e.courseid AND ul.userid = u.id)";
 210             if ($sort === 'firstname') {
 211                 $sql .= " ORDER BY u.firstname $direction, u.lastname $direction";
 212             } else if ($sort === 'lastname') {
 213                 $sql .= " ORDER BY u.lastname $direction, u.firstname $direction";
 214             } else if ($sort === 'email') {
 215                 $sql .= " ORDER BY u.email $direction, u.lastname $direction, u.firstname $direction";
 216             } else if ($sort === 'lastseen') {
 217                 $sql .= " ORDER BY ul.timeaccess $direction, u.lastname $direction, u.firstname $direction";
 218             }
 219             $this->users[$key] = $DB->get_records_sql($sql, $params, $page*$perpage, $perpage);
 220         }
 221         return $this->users[$key];
 222     }
 223
 224     /**
 225      * Gets and array of other users.
 226      *
 227      * Other users are users who have been assigned roles or inherited roles
 228      * within this course but who have not been enrolled in the course
 229      *
 230      * @global moodle_database $DB
 231      * @param string $sort
 232      * @param string $direction
 233      * @param int $page
 234      * @param int $perpage
 235      * @return array
 236      */
 237     public function get_other_users($sort, $direction='ASC', $page=0, $perpage=25) {
 238         global $DB;
 239         if ($direction !== 'ASC') {
 240             $direction = 'DESC';
 241         }
 242         $key = md5("$sort-$direction-$page-$perpage");
 243         if (!array_key_exists($key, $this->otherusers)) {
 244             list($ctxcondition, $params) = $DB->get_in_or_equal(get_parent_contexts($this->context, true), SQL_PARAMS_NAMED, 'ctx');
 245             $params['courseid'] = $this->course->id;
 246             $params['cid'] = $this->course->id;
 247             $sql = "SELECT ra.id as raid, ra.contextid, ra.component, ctx.contextlevel, ra.roleid, u.*, ue.lastseen
 248                     FROM {role_assignments} ra
 249                     JOIN {user} u ON u.id = ra.userid
 250                     JOIN {context} ctx ON ra.contextid = ctx.id
 251                LEFT JOIN (
 252                        SELECT ue.id, ue.userid, ul.timeaccess AS lastseen
 253                          FROM {user_enrolments} ue
 254                     LEFT JOIN {enrol} e ON e.id=ue.enrolid
 255                     LEFT JOIN {user_lastaccess} ul ON (ul.courseid = e.courseid AND ul.userid = ue.userid)
 256                         WHERE e.courseid = :courseid
 257                        ) ue ON ue.userid=u.id
 258                    WHERE ctx.id $ctxcondition AND
 259                          ue.id IS NULL
 260                 ORDER BY u.$sort $direction, ctx.depth DESC";
 261             $this->otherusers[$key] = $DB->get_records_sql($sql, $params, $page*$perpage, $perpage);
 262         }
 263         return $this->otherusers[$key];
 264     }
 265
 266     /**
 267      * Gets an array of the users that can be enrolled in this course.
 268      *
 269      * @global moodle_database $DB
 270      * @param int $enrolid
 271      * @param string $search
 272      * @param bool $searchanywhere
 273      * @param int $page Defaults to 0
 274      * @param int $perpage Defaults to 25
 275      * @return array Array(totalusers => int, users => array)
 276      */
 277     public function get_potential_users($enrolid, $search='', $searchanywhere=false, $page=0, $perpage=25) {
 278         global $DB, $CFG;
 279
 280         // Add some additional sensible conditions
 281         $tests = array("id <> :guestid", 'u.deleted = 0', 'u.confirmed = 1');
 282         $params = array('guestid' => $CFG->siteguest);
 283         if (!empty($search)) {
 284             $conditions = get_extra_user_fields($this->get_context());
 285             $conditions[] = $DB->sql_concat('u.firstname', "' '", 'u.lastname');
 286             if ($searchanywhere) {
 287                 $searchparam = '%' . $search . '%';
 288             } else {
 289                 $searchparam = $search . '%';
 290             }
 291             $i = 0;
 292             foreach ($conditions as $key=>$condition) {
 293                 $conditions[$key] = $DB->sql_like($condition,":con{$i}00", false);
 294                 $params["con{$i}00"] = $searchparam;
 295                 $i++;
 296             }
 297             $tests[] = '(' . implode(' OR ', $conditions) . ')';
 298         }
 299         $wherecondition = implode(' AND ', $tests);
 300
 301         $extrafields = get_extra_user_fields($this->get_context(), array('username', 'lastaccess'));
 302         $extrafields[] = 'username';
 303         $extrafields[] = 'lastaccess';
 304         $ufields = user_picture::fields('u', $extrafields);
 305
 306         $fields      = 'SELECT '.$ufields;
 307         $countfields = 'SELECT COUNT(1)';
 308         $sql = " FROM {user} u
 309                 WHERE $wherecondition
 310                       AND u.id NOT IN (SELECT ue.userid
 311                                          FROM {user_enrolments} ue
 312                                          JOIN {enrol} e ON (e.id = ue.enrolid AND e.id = :enrolid))";
 313         $order = ' ORDER BY u.lastname ASC, u.firstname ASC';
 314         $params['enrolid'] = $enrolid;
 315         $totalusers = $DB->count_records_sql($countfields . $sql, $params);
 316         $availableusers = $DB->get_records_sql($fields . $sql . $order, $params, $page*$perpage, $perpage);
 317         return array('totalusers'=>$totalusers, 'users'=>$availableusers);
 318     }
 319
 320     /**
 321      * Searches other users and returns paginated results
 322      *
 323      * @global moodle_database $DB
 324      * @param string $search
 325      * @param bool $searchanywhere
 326      * @param int $page Starting at 0
 327      * @param int $perpage
 328      * @return array
 329      */
 330     public function search_other_users($search='', $searchanywhere=false, $page=0, $perpage=25) {
 331         global $DB, $CFG;
 332
 333         // Add some additional sensible conditions
 334         $tests = array("u.id <> :guestid", 'u.deleted = 0', 'u.confirmed = 1');
 335         $params = array('guestid'=>$CFG->siteguest);
 336         if (!empty($search)) {
 337             $conditions = array('u.firstname','u.lastname');
 338             if ($searchanywhere) {
 339                 $searchparam = '%' . $search . '%';
 340             } else {
 341                 $searchparam = $search . '%';
 342             }
 343             $i = 0;
 344             foreach ($conditions as $key=>$condition) {
 345                 $conditions[$key] = $DB->sql_like($condition, ":con{$i}00", false);
 346                 $params["con{$i}00"] = $searchparam;
 347                 $i++;
 348             }
 349             $tests[] = '(' . implode(' OR ', $conditions) . ')';
 350         }
 351         $wherecondition = implode(' AND ', $tests);
 352
 353         $fields      = 'SELECT '.user_picture::fields('u', array('username','lastaccess'));
 354         $countfields = 'SELECT COUNT(u.id)';
 355         $sql   = " FROM {user} u
 356                   WHERE $wherecondition
 357                     AND u.id NOT IN (
 358                            SELECT u.id
 359                              FROM {role_assignments} r, {user} u
 360                             WHERE r.contextid = :contextid AND
 361                                   u.id = r.userid)";
 362         $order = ' ORDER BY lastname ASC, firstname ASC';
 363
 364         $params['contextid'] = $this->context->id;
 365         $totalusers = $DB->count_records_sql($countfields . $sql, $params);
 366         $availableusers = $DB->get_records_sql($fields . $sql . $order, $params, $page*$perpage, $perpage);
 367         return array('totalusers'=>$totalusers, 'users'=>$availableusers);
 368     }
 369
 370     /**
 371      * Gets an array containing some SQL to user for when selecting, params for
 372      * that SQL, and the filter that was used in constructing the sql.
 373      *
 374      * @global moodle_database $DB
 375      * @return string
 376      */
 377     protected function get_instance_sql() {
 378         global $DB;
 379         if ($this->_instancessql === null) {
 380             $instances = $this->get_enrolment_instances();
 381             $filter = $this->get_enrolment_filter();
 382             if ($filter && array_key_exists($filter, $instances)) {
 383                 $sql = " = :ifilter";
 384                 $params = array('ifilter'=>$filter);
 385             } else {
 386                 $filter = 0;
 387                 if ($instances) {
 388                     list($sql, $params) = $DB->get_in_or_equal(array_keys($this->get_enrolment_instances()), SQL_PARAMS_NAMED);
 389                 } else {
 390                     // no enabled instances, oops, we should probably say something
 391                     $sql = "= :never";
 392                     $params = array('never'=>-1);
 393                 }
 394             }
 395             $this->instancefilter = $filter;
 396             $this->_instancessql = array($sql, $params, $filter);
 397         }
 398         return $this->_instancessql;
 399     }
 400
 401     /**
 402      * Returns all of the enrolment instances for this course.
 403      *
 404      * @return array
 405      */
 406     public function get_enrolment_instances() {
 407         if ($this->_instances === null) {
 408             $this->_instances = enrol_get_instances($this->course->id, true);
 409         }
 410         return $this->_instances;
 411     }
 412
 413     /**
 414      * Returns the names for all of the enrolment instances for this course.
 415      *
 416      * @return array
 417      */
 418     public function get_enrolment_instance_names() {
 419         if ($this->_inames === null) {
 420             $instances = $this->get_enrolment_instances();
 421             $plugins = $this->get_enrolment_plugins();
 422             foreach ($instances as $key=>$instance) {
 423                 if (!isset($plugins[$instance->enrol])) {
 424                     // weird, some broken stuff in plugin
 425                     unset($instances[$key]);
 426                     continue;
 427                 }
 428                 $this->_inames[$key] = $plugins[$instance->enrol]->get_instance_name($instance);
 429             }
 430         }
 431         return $this->_inames;
 432     }
 433
 434     /**
 435      * Gets all of the enrolment plugins that are active for this course.
 436      *
 437      * @return array
 438      */
 439     public function get_enrolment_plugins() {
 440         if ($this->_plugins === null) {
 441             $this->_plugins = enrol_get_plugins(true);
 442         }
 443         return $this->_plugins;
 444     }
 445
 446     /**
 447      * Gets all of the roles this course can contain.
 448      *
 449      * @return array
 450      */
 451     public function get_all_roles() {
 452         if ($this->_roles === null) {
 453             $this->_roles = role_fix_names(get_all_roles(), $this->context);
 454         }
 455         return $this->_roles;
 456     }
 457
 458     /**
 459      * Gets all of the assignable roles for this course.
 460      *
 461      * @return array
 462      */
 463     public function get_assignable_roles($otherusers = false) {
 464         if ($this->_assignableroles === null) {
 465             $this->_assignableroles = get_assignable_roles($this->context, ROLENAME_ALIAS, false); // verifies unassign access control too
 466         }
 467
 468         if ($otherusers) {
 469             if (!is_array($this->_assignablerolesothers)) {
 470                 $this->_assignablerolesothers = array();
 471                 list($courseviewroles, $ignored) = get_roles_with_cap_in_context($this->context, 'moodle/course:view');
 472                 foreach ($this->_assignableroles as $roleid=>$role) {
 473                     if (isset($courseviewroles[$roleid])) {
 474                         $this->_assignablerolesothers[$roleid] = $role;
 475                     }
 476                 }
 477             }
 478             return $this->_assignablerolesothers;
 479         } else {
 480             return $this->_assignableroles;
 481         }
 482     }
 483
 484     /**
 485      * Gets all of the groups for this course.
 486      *
 487      * @return array
 488      */
 489     public function get_all_groups() {
 490         if ($this->_groups === null) {
 491             $this->_groups = groups_get_all_groups($this->course->id);
 492             foreach ($this->_groups as $gid=>$group) {
 493                 $this->_groups[$gid]->name = format_string($group->name);
 494             }
 495         }
 496         return $this->_groups;
 497     }
 498
 499     /**
 500      * Unenrols a user from the course given the users ue entry
 501      *
 502      * @global moodle_database $DB
 503      * @param stdClass $ue
 504      * @return bool
 505      */
 506     public function unenrol_user($ue) {
 507         global $DB;
 508         list ($instance, $plugin) = $this->get_user_enrolment_components($ue);
 509         if ($instance && $plugin && $plugin->allow_unenrol_user($instance, $ue) && has_capability("enrol/$instance->enrol:unenrol", $this->context)) {
 510             $plugin->unenrol_user($instance, $ue->userid);
 511             return true;
 512         }
 513         return false;
 514     }
 515
 516     /**
 517      * Given a user enrolment record this method returns the plugin and enrolment
 518      * instance that relate to it.
 519      *
 520      * @param stdClass|int $userenrolment
 521      * @return array array($instance, $plugin)
 522      */
 523     public function get_user_enrolment_components($userenrolment) {
 524         global $DB;
 525         if (is_numeric($userenrolment)) {
 526             $userenrolment = $DB->get_record('user_enrolments', array('id'=>(int)$userenrolment));
 527         }
 528         $instances = $this->get_enrolment_instances();
 529         $plugins = $this->get_enrolment_plugins();
 530         if (!$userenrolment || !isset($instances[$userenrolment->enrolid])) {
 531             return array(false, false);
 532         }
 533         $instance = $instances[$userenrolment->enrolid];
 534         $plugin = $plugins[$instance->enrol];
 535         return array($instance, $plugin);
 536     }
 537
 538     /**
 539      * Removes an assigned role from a user.
 540      *
 541      * @global moodle_database $DB
 542      * @param int $userid
 543      * @param int $roleid
 544      * @return bool
 545      */
 546     public function unassign_role_from_user($userid, $roleid) {
 547         global $DB;
 548         require_capability('moodle/role:assign', $this->context);
 549         $user = $DB->get_record('user', array('id'=>$userid), '*', MUST_EXIST);
 550         try {
 551             role_unassign($roleid, $user->id, $this->context->id, '', NULL);
 552         } catch (Exception $e) {
 553             if (defined('AJAX_SCRIPT')) {
 554                 throw $e;
 555             }
 556             return false;
 557         }
 558         return true;
 559     }
 560
 561     /**
 562      * Assigns a role to a user.
 563      *
 564      * @param int $roleid
 565      * @param int $userid
 566      * @return int|false
 567      */
 568     public function assign_role_to_user($roleid, $userid) {
 569         require_capability('moodle/role:assign', $this->context);
 570         if (!array_key_exists($roleid, $this->get_assignable_roles())) {
 571             if (defined('AJAX_SCRIPT')) {
 572                 throw new moodle_exception('invalidrole');
 573             }
 574             return false;
 575         }
 576         return role_assign($roleid, $userid, $this->context->id, '', NULL);
 577     }
 578
 579     /**
 580      * Adds a user to a group
 581      *
 582      * @param stdClass $user
 583      * @param int $groupid
 584      * @return bool
 585      */
 586     public function add_user_to_group($user, $groupid) {
 587         require_capability('moodle/course:managegroups', $this->context);
 588         $group = $this->get_group($groupid);
 589         if (!$group) {
 590             return false;
 591         }
 592         return groups_add_member($group->id, $user->id);
 593     }
 594
 595     /**
 596      * Removes a user from a group
 597      *
 598      * @global moodle_database $DB
 599      * @param StdClass $user
 600      * @param int $groupid
 601      * @return bool
 602      */
 603     public function remove_user_from_group($user, $groupid) {
 604         global $DB;
 605         require_capability('moodle/course:managegroups', $this->context);
 606         $group = $this->get_group($groupid);
 607         if (!$group) {
 608             return false;
 609         }
 610         return groups_remove_member($group, $user);
 611     }
 612
 613     /**
 614      * Gets the requested group
 615      *
 616      * @param int $groupid
 617      * @return stdClass|int
 618      */
 619     public function get_group($groupid) {
 620         $groups = $this->get_all_groups();
 621         if (!array_key_exists($groupid, $groups)) {
 622             return false;
 623         }
 624         return $groups[$groupid];
 625     }
 626
 627     /**
 628      * Edits an enrolment
 629      *
 630      * @param stdClass $userenrolment
 631      * @param stdClass $data
 632      * @return bool
 633      */
 634     public function edit_enrolment($userenrolment, $data) {
 635         //Only allow editing if the user has the appropriate capability
 636         //Already checked in /enrol/users.php but checking again in case this function is called from elsewhere
 637         list($instance, $plugin) = $this->get_user_enrolment_components($userenrolment);
 638         if ($instance && $plugin && $plugin->allow_manage($instance) && has_capability("enrol/$instance->enrol:manage", $this->context)) {
 639             if (!isset($data->status)) {
 640                 $data->status = $userenrolment->status;
 641             }
 642             $plugin->update_user_enrol($instance, $userenrolment->userid, $data->status, $data->timestart, $data->timeend);
 643             return true;
 644         }
 645         return false;
 646     }
 647
 648     /**
 649      * Returns the current enrolment filter that is being applied by this class
 650      * @return string
 651      */
 652     public function get_enrolment_filter() {
 653         return $this->instancefilter;
 654     }
 655
 656     /**
 657      * Gets the roles assigned to this user that are applicable for this course.
 658      *
 659      * @param int $userid
 660      * @return array
 661      */
 662     public function get_user_roles($userid) {
 663         $roles = array();
 664         $ras = get_user_roles($this->context, $userid, true, 'c.contextlevel DESC, r.sortorder ASC');
 665         foreach ($ras as $ra) {
 666             if ($ra->contextid != $this->context->id) {
 667                 if (!array_key_exists($ra->roleid, $roles)) {
 668                     $roles[$ra->roleid] = null;
 669                 }
 670                 // higher ras, course always takes precedence
 671                 continue;
 672             }
 673             if (array_key_exists($ra->roleid, $roles) && $roles[$ra->roleid] === false) {
 674                 continue;
 675             }
 676             $roles[$ra->roleid] = ($ra->itemid == 0 and $ra->component === '');
 677         }
 678         return $roles;
 679     }
 680
 681     /**
 682      * Gets the enrolments this user has in the course
 683      *
 684      * @global moodle_database $DB
 685      * @param int $userid
 686      * @return array
 687      */
 688     public function get_user_enrolments($userid) {
 689         global $DB;
 690         list($instancessql, $params, $filter) = $this->get_instance_sql();
 691         $params['userid'] = $userid;
 692         $userenrolments = $DB->get_records_select('user_enrolments', "enrolid $instancessql AND userid = :userid", $params);
 693         $instances = $this->get_enrolment_instances();
 694         $plugins = $this->get_enrolment_plugins();
 695         $inames = $this->get_enrolment_instance_names();
 696         foreach ($userenrolments as &$ue) {
 697             $ue->enrolmentinstance     = $instances[$ue->enrolid];
 698             $ue->enrolmentplugin       = $plugins[$ue->enrolmentinstance->enrol];
 699             $ue->enrolmentinstancename = $inames[$ue->enrolmentinstance->id];
 700         }
 701         return $userenrolments;
 702     }
 703
 704     /**
 705      * Gets the groups this user belongs to
 706      *
 707      * @param int $userid
 708      * @return array
 709      */
 710     public function get_user_groups($userid) {
 711         return groups_get_all_groups($this->course->id, $userid, 0, 'g.id');
 712     }
 713
 714     /**
 715      * Retursn an array of params that would go into the URL to return to this
 716      * exact page.
 717      *
 718      * @return array
 719      */
 720     public function get_url_params() {
 721         $args = array(
 722             'id' => $this->course->id
 723         );
 724         if (!empty($this->instancefilter)) {
 725             $args['ifilter'] = $this->instancefilter;
 726         }
 727         return $args;
 728     }
 729
 730     /**
 731      * Returns the course this object is managing enrolments for
 732      *
 733      * @return stdClass
 734      */
 735     public function get_course() {
 736         return $this->course;
 737     }
 738
 739     /**
 740      * Returns the course context
 741      *
 742      * @return stdClass
 743      */
 744     public function get_context() {
 745         return $this->context;
 746     }
 747
 748     /**
 749      * Gets an array of other users in this course ready for display.
 750      *
 751      * Other users are users who have been assigned or inherited roles within this
 752      * course but have not been enrolled.
 753      *
 754      * @param core_enrol_renderer $renderer
 755      * @param moodle_url $pageurl
 756      * @param string $sort
 757      * @param string $direction ASC | DESC
 758      * @param int $page Starting from 0
 759      * @param int $perpage
 760      * @return array
 761      */
 762     public function get_other_users_for_display(core_enrol_renderer $renderer, moodle_url $pageurl, $sort, $direction, $page, $perpage) {
 763
 764         $userroles = $this->get_other_users($sort, $direction, $page, $perpage);
 765         $roles = $this->get_all_roles();
 766
 767         $context    = $this->get_context();
 768         $now = time();
 769         $extrafields = get_extra_user_fields($context);
 770
 771         $users = array();
 772         foreach ($userroles as $userrole) {
 773             $contextid = $userrole->contextid;
 774             unset($userrole->contextid); // This would collide with user avatar.
 775             if (!array_key_exists($userrole->id, $users)) {
 776                 $users[$userrole->id] = $this->prepare_user_for_display($userrole, $extrafields, $now);
 777             }
 778             $a = new stdClass;
 779             $a->role = $roles[$userrole->roleid]->localname;
 780             $changeable = ($userrole->component == '');
 781             if ($contextid == $this->context->id) {
 782                 $roletext = get_string('rolefromthiscourse', 'enrol', $a);
 783             } else {
 784                 $changeable = false;
 785                 switch ($userrole->contextlevel) {
 786                     case CONTEXT_COURSE :
 787                         // Meta course
 788                         $roletext = get_string('rolefrommetacourse', 'enrol', $a);
 789                         break;
 790                     case CONTEXT_COURSECAT :
 791                         $roletext = get_string('rolefromcategory', 'enrol', $a);
 792                         break;
 793                     case CONTEXT_SYSTEM:
 794                     default:
 795                         $roletext = get_string('rolefromsystem', 'enrol', $a);
 796                         break;
 797                 }
 798             }
 799             $users[$userrole->id]['roles'] = array();
 800             $users[$userrole->id]['roles'][$userrole->roleid] = array(
 801                 'text' => $roletext,
 802                 'unchangeable' => !$changeable
 803             );
 804         }
 805         return $users;
 806     }
 807
 808     /**
 809      * Gets an array of users for display, this includes minimal user information
 810      * as well as minimal information on the users roles, groups, and enrolments.
 811      *
 812      * @param core_enrol_renderer $renderer
 813      * @param moodle_url $pageurl
 814      * @param int $sort
 815      * @param string $direction ASC or DESC
 816      * @param int $page
 817      * @param int $perpage
 818      * @return array
 819      */
 820     public function get_users_for_display(course_enrolment_manager $manager, $sort, $direction, $page, $perpage) {
 821         $pageurl = $manager->get_moodlepage()->url;
 822         $users = $this->get_users($sort, $direction, $page, $perpage);
 823
 824         $now = time();
 825         $straddgroup = get_string('addgroup', 'group');
 826         $strunenrol = get_string('unenrol', 'enrol');
 827         $stredit = get_string('edit');
 828
 829         $allroles   = $this->get_all_roles();
 830         $assignable = $this->get_assignable_roles();
 831         $allgroups  = $this->get_all_groups();
 832         $context    = $this->get_context();
 833         $canmanagegroups = has_capability('moodle/course:managegroups', $context);
 834
 835         $url = new moodle_url($pageurl, $this->get_url_params());
 836         $extrafields = get_extra_user_fields($context);
 837
 838         $userdetails = array();
 839         foreach ($users as $user) {
 840             $details = $this->prepare_user_for_display($user, $extrafields, $now);
 841
 842             // Roles
 843             $details['roles'] = array();
 844             foreach ($this->get_user_roles($user->id) as $rid=>$rassignable) {
 845                 $details['roles'][$rid] = array('text'=>$allroles[$rid]->localname, 'unchangeable'=>(!$rassignable || !isset($assignable[$rid])));
 846             }
 847
 848             // Users
 849             $usergroups = $this->get_user_groups($user->id);
 850             $details['groups'] = array();
 851             foreach($usergroups as $gid=>$unused) {
 852                 $details['groups'][$gid] = $allgroups[$gid]->name;
 853             }
 854
 855             // Enrolments
 856             $details['enrolments'] = array();
 857             foreach ($this->get_user_enrolments($user->id) as $ue) {
 858                 if ($ue->timestart and $ue->timeend) {
 859                     $period = get_string('periodstartend', 'enrol', array('start'=>userdate($ue->timestart), 'end'=>userdate($ue->timeend)));
 860                     $periodoutside = ($ue->timestart && $ue->timeend && $now < $ue->timestart && $now > $ue->timeend);
 861                 } else if ($ue->timestart) {
 862                     $period = get_string('periodstart', 'enrol', userdate($ue->timestart));
 863                     $periodoutside = ($ue->timestart && $now < $ue->timestart);
 864                 } else if ($ue->timeend) {
 865                     $period = get_string('periodend', 'enrol', userdate($ue->timeend));
 866                     $periodoutside = ($ue->timeend && $now > $ue->timeend);
 867                 } else {
 868                     $period = '';
 869                     $periodoutside = false;
 870                 }
 871                 $details['enrolments'][$ue->id] = array(
 872                     'text' => $ue->enrolmentinstancename,
 873                     'period' => $period,
 874                     'dimmed' =>  ($periodoutside || $ue->status != ENROL_USER_ACTIVE),
 875                     'actions' => $ue->enrolmentplugin->get_user_enrolment_actions($manager, $ue)
 876                 );
 877             }
 878             $userdetails[$user->id] = $details;
 879         }
 880         return $userdetails;
 881     }
 882
 883     /**
 884      * Prepare a user record for display
 885      *
 886      * This function is called by both {@link get_users_for_display} and {@link get_other_users_for_display} to correctly
 887      * prepare user fields for display
 888      *
 889      * Please note that this function does not check capability for moodle/coures:viewhiddenuserfields
 890      *
 891      * @param object $user The user record
 892      * @param array $extrafields The list of fields as returned from get_extra_user_fields used to determine which
 893      * additional fields may be displayed
 894      * @param int $now The time used for lastaccess calculation
 895      * @return array The fields to be displayed including userid, courseid, picture, firstname, lastseen and any
 896      * additional fields from $extrafields
 897      */
 898     private function prepare_user_for_display($user, $extrafields, $now) {
 899         $details = array(
 900             'userid'    => $user->id,
 901             'courseid'  => $this->get_course()->id,
 902             'picture'   => new user_picture($user),
 903             'firstname' => fullname($user, has_capability('moodle/site:viewfullnames', $this->get_context())),
 904             'lastseen'  => get_string('never'),
 905         );
 906         foreach ($extrafields as $field) {
 907             $details[$field] = $user->{$field};
 908         }
 909
 910         if ($user->lastaccess) {
 911             $details['lastseen'] = format_time($now - $user->lastaccess);
 912         }
 913         return $details;
 914     }
 915
 916     public function get_manual_enrol_buttons() {
 917         $plugins = $this->get_enrolment_plugins();
 918         $buttons = array();
 919         foreach ($plugins as $plugin) {
 920             $newbutton = $plugin->get_manual_enrol_button($this);
 921             if (is_array($newbutton)) {
 922                 $buttons += $newbutton;
 923             } else if ($newbutton instanceof enrol_user_button) {
 924                 $buttons[] = $newbutton;
 925             }
 926         }
 927         return $buttons;
 928     }
 929
 930     public function has_instance($enrolpluginname) {
 931         // Make sure manual enrolments instance exists
 932         foreach ($this->get_enrolment_instances() as $instance) {
 933             if ($instance->enrol == $enrolpluginname) {
 934                 return true;
 935             }
 936         }
 937         return false;
 938     }
 939
 940     /**
 941      * Returns the enrolment plugin that the course manager was being filtered to.
 942      *
 943      * If no filter was being applied then this function returns false.
 944      *
 945      * @return enrol_plugin
 946      */
 947     public function get_filtered_enrolment_plugin() {
 948         $instances = $this->get_enrolment_instances();
 949         $plugins = $this->get_enrolment_plugins();
 950
 951         if (empty($this->instancefilter) || !array_key_exists($this->instancefilter, $instances)) {
 952             return false;
 953         }
 954
 955         $instance = $instances[$this->instancefilter];
 956         return $plugins[$instance->enrol];
 957     }
 958
 959     /**
 960      * Returns and array of users + enrolment details.
 961      *
 962      * Given an array of user id's this function returns and array of user enrolments for those users
 963      * as well as enough user information to display the users name and picture for each enrolment.
 964      *
 965      * @global moodle_database $DB
 966      * @param array $userids
 967      * @return array
 968      */
 969     public function get_users_enrolments(array $userids) {
 970         global $DB;
 971
 972         $instances = $this->get_enrolment_instances();
 973         $plugins = $this->get_enrolment_plugins();
 974
 975         if  (!empty($this->instancefilter)) {
 976             $instancesql = ' = :instanceid';
 977             $instanceparams = array('instanceid' => $this->instancefilter);
 978         } else {
 979             list($instancesql, $instanceparams) = $DB->get_in_or_equal(array_keys($instances), SQL_PARAMS_NAMED, 'instanceid0000');
 980         }
 981
 982         $userfields = user_picture::fields('u');
 983         list($idsql, $idparams) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED, 'userid0000');
 984
 985         $sql = "SELECT ue.id AS ueid, ue.status, ue.enrolid, ue.userid, ue.timestart, ue.timeend, ue.modifierid, ue.timecreated, ue.timemodified, $userfields
 986                   FROM {user_enrolments} ue
 987              LEFT JOIN {user} u ON u.id = ue.userid
 988                  WHERE ue.enrolid $instancesql AND
 989                        u.id $idsql
 990               ORDER BY u.firstname ASC, u.lastname ASC";
 991
 992         $rs = $DB->get_recordset_sql($sql, $idparams + $instanceparams);
 993         $users = array();
 994         foreach ($rs as $ue) {
 995             $user = user_picture::unalias($ue);
 996             $ue->id = $ue->ueid;
 997             unset($ue->ueid);
 998             if (!array_key_exists($user->id, $users)) {
 999                 $user->enrolments = array();
1000                 $users[$user->id] = $user;
1001             }
1002             $ue->enrolmentinstance = $instances[$ue->enrolid];
1003             $ue->enrolmentplugin = $plugins[$ue->enrolmentinstance->enrol];
1004             $users[$user->id]->enrolments[$ue->id] = $ue;
1005         }
1006         $rs->close();
1007         return $users;
1008     }
1009 }
1010
1011 /**
1012  * A button that is used to enrol users in a course
1013  *
1014  * @copyright 2010 Sam Hemelryk
1015  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1016  */
1017 class enrol_user_button extends single_button {
1018
1019     /**
1020      * An array containing JS YUI modules required by this button
1021      * @var array
1022      */
1023     protected $jsyuimodules = array();
1024
1025     /**
1026      * An array containing JS initialisation calls required by this button
1027      * @var array
1028      */
1029     protected $jsinitcalls = array();
1030
1031     /**
1032      * An array strings required by JS for this button
1033      * @var array
1034      */
1035     protected $jsstrings = array();
1036
1037     /**
1038      * Initialises the new enrol_user_button
1039      *
1040      * @staticvar int $count The number of enrol user buttons already created
1041      * @param moodle_url $url
1042      * @param string $label The text to display in the button
1043      * @param string $method Either post or get
1044      */
1045     public function __construct(moodle_url $url, $label, $method = 'post') {
1046         static $count = 0;
1047         $count ++;
1048         parent::__construct($url, $label, $method);
1049         $this->class = 'singlebutton enrolusersbutton';
1050         $this->formid = 'enrolusersbutton-'.$count;
1051     }
1052
1053     /**
1054      * Adds a YUI module call that will be added to the page when the button is used.
1055      *
1056      * @param string|array $modules One or more modules to require
1057      * @param string $function The JS function to call
1058      * @param array $arguments An array of arguments to pass to the function
1059      * @param string $galleryversion The YUI gallery version of any modules required
1060      * @param bool $ondomready If true the call is postponed until the DOM is finished loading
1061      */
1062     public function require_yui_module($modules, $function, array $arguments = null, $galleryversion = '2010.04.08-12-35', $ondomready = false) {
1063         $js = new stdClass;
1064         $js->modules = (array)$modules;
1065         $js->function = $function;
1066         $js->arguments = $arguments;
1067         $js->galleryversion = $galleryversion;
1068         $js->ondomready = $ondomready;
1069         $this->jsyuimodules[] = $js;
1070     }
1071
1072     /**
1073      * Adds a JS initialisation call to the page when the button is used.
1074      *
1075      * @param string $function The function to call
1076      * @param array $extraarguments An array of arguments to pass to the function
1077      * @param bool $ondomready If true the call is postponed until the DOM is finished loading
1078      * @param array $module A module definition
1079      */
1080     public function require_js_init_call($function, array $extraarguments = null, $ondomready = false, array $module = null) {
1081         $js = new stdClass;
1082         $js->function = $function;
1083         $js->extraarguments = $extraarguments;
1084         $js->ondomready = $ondomready;
1085         $js->module = $module;
1086         $this->jsinitcalls[] = $js;
1087     }
1088
1089     /**
1090      * Requires strings for JS that will be loaded when the button is used.
1091      *
1092      * @param type $identifiers
1093      * @param string $component
1094      * @param mixed $a
1095      */
1096     public function strings_for_js($identifiers, $component = 'moodle', $a = null) {
1097         $string = new stdClass;
1098         $string->identifiers = (array)$identifiers;
1099         $string->component = $component;
1100         $string->a = $a;
1101         $this->jsstrings[] = $string;
1102     }
1103
1104     /**
1105      * Initialises the JS that is required by this button
1106      *
1107      * @param moodle_page $page
1108      */
1109     public function initialise_js(moodle_page $page) {
1110         foreach ($this->jsyuimodules as $js) {
1111             $page->requires->yui_module($js->modules, $js->function, $js->arguments, $js->galleryversion, $js->ondomready);
1112         }
1113         foreach ($this->jsinitcalls as $js) {
1114             $page->requires->js_init_call($js->function, $js->extraarguments, $js->ondomready, $js->module);
1115         }
1116         foreach ($this->jsstrings as $string) {
1117             $page->requires->strings_for_js($string->identifiers, $string->component, $string->a);
1118         }
1119     }
1120 }
1121
1122 /**
1123  * User enrolment action
1124  *
1125  * This class is used to manage a renderable ue action such as editing an user enrolment or deleting
1126  * a user enrolment.
1127  *
1128  * @copyright  2011 Sam Hemelryk
1129  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1130  */
1131 class user_enrolment_action implements renderable {
1132
1133     /**
1134      * The icon to display for the action
1135      * @var pix_icon
1136      */
1137     protected $icon;
1138
1139     /**
1140      * The title for the action
1141      * @var string
1142      */
1143     protected $title;
1144
1145     /**
1146      * The URL to the action
1147      * @var moodle_url
1148      */
1149     protected $url;
1150
1151     /**
1152      * An array of HTML attributes
1153      * @var array
1154      */
1155     protected $attributes = array();
1156
1157     /**
1158      * Constructor
1159      * @param pix_icon $icon
1160      * @param string $title
1161      * @param moodle_url $url
1162      * @param array $attributes
1163      */
1164     public function __construct(pix_icon $icon, $title, $url, array $attributes = null) {
1165         $this->icon = $icon;
1166         $this->title = $title;
1167         $this->url = new moodle_url($url);
1168         if (!empty($attributes)) {
1169             $this->attributes = $attributes;
1170         }
1171         $this->attributes['title'] = $title;
1172     }
1173
1174     /**
1175      * Returns the icon for this action
1176      * @return pix_icon
1177      */
1178     public function get_icon() {
1179         return $this->icon;
1180     }
1181
1182     /**
1183      * Returns the title for this action
1184      * @return string
1185      */
1186     public function get_title() {
1187         return $this->title;
1188     }
1189
1190     /**
1191      * Returns the URL for this action
1192      * @return moodle_url
1193      */
1194     public function get_url() {
1195         return $this->url;
1196     }
1197
1198     /**
1199      * Returns the attributes to use for this action
1200      * @return array
1201      */
1202     public function get_attributes() {
1203         return $this->attributes;
1204     }
1205 }
1206
1207 class enrol_ajax_exception extends moodle_exception {
1208     /**
1209      * Constructor
1210      * @param string $errorcode The name of the string from error.php to print
1211      * @param string $module name of module
1212      * @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.
1213      * @param object $a Extra words and phrases that might be required in the error string
1214      * @param string $debuginfo optional debugging information
1215      */
1216     public function __construct($errorcode, $link = '', $a = NULL, $debuginfo = null) {
1217         parent::__construct($errorcode, 'enrol', $link, $a, $debuginfo);
1218     }
1219 }
1220
1221 /**
1222  * This class is used to manage a bulk operations for enrolment plugins.
1223  *
1224  * @copyright 2011 Sam Hemelryk
1225  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1226  */
1227 abstract class enrol_bulk_enrolment_operation {
1228
1229     /**
1230      * The course enrolment manager
1231      * @var course_enrolment_manager
1232      */
1233     protected $manager;
1234
1235     /**
1236      * The enrolment plugin to which this operation belongs
1237      * @var enrol_plugin
1238      */
1239     protected $plugin;
1240
1241     /**
1242      * Contructor
1243      * @param course_enrolment_manager $manager
1244      * @param stdClass $plugin
1245      */
1246     public function __construct(course_enrolment_manager $manager, enrol_plugin $plugin = null) {
1247         $this->manager = $manager;
1248         $this->plugin = $plugin;
1249     }
1250
1251     /**
1252      * Returns a moodleform used for this operation, or false if no form is required and the action
1253      * should be immediatly processed.
1254      *
1255      * @param moodle_url|string $defaultaction
1256      * @param mixed $defaultcustomdata
1257      * @return enrol_bulk_enrolment_change_form|moodleform|false
1258      */
1259     public function get_form($defaultaction = null, $defaultcustomdata = null) {
1260         return false;
1261     }
1262
1263     /**
1264      * Returns the title to use for this bulk operation
1265      *
1266      * @return string
1267      */
1268     abstract public function get_title();
1269
1270     /**
1271      * Returns the identifier for this bulk operation.
1272      * This should be the same identifier used by the plugins function when returning
1273      * all of its bulk operations.
1274      *
1275      * @return string
1276      */
1277     abstract public function get_identifier();
1278
1279     /**
1280      * Processes the bulk operation on the given users
1281      *
1282      * @param course_enrolment_manager $manager
1283      * @param array $users
1284      * @param stdClass $properties
1285      */
1286     abstract public function process(course_enrolment_manager $manager, array $users, stdClass $properties);
1287 }