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 context
  42      */
  43     protected $context;
  44     /**
  45      * The course we are managing enrolments for
  46      * @var stdClass
  47      */
  48     protected $course = null;
  49     /**
  50      * Limits the focus of the manager to one enrolment plugin instance
  51      * @var string
  52      */
  53     protected $instancefilter = null;
  54     /**
  55      * Limits the focus of the manager to users with specified role
  56      * @var int
  57      */
  58     protected $rolefilter = 0;
  59     /**
  60      * Limits the focus of the manager to users who match search string
  61      * @var string
  62      */
  63     protected $searchfilter = '';
  64     /**
  65      * Limits the focus of the manager to users in specified group
  66      * @var int
  67      */
  68     protected $groupfilter = 0;
  69     /**
  70      * Limits the focus of the manager to users who match status active/inactive
  71      * @var int
  72      */
  73     protected $statusfilter = -1;
  74
  75     /**
  76      * The total number of users enrolled in the course
  77      * Populated by course_enrolment_manager::get_total_users
  78      * @var int
  79      */
  80     protected $totalusers = null;
  81     /**
  82      * An array of users currently enrolled in the course
  83      * Populated by course_enrolment_manager::get_users
  84      * @var array
  85      */
  86     protected $users = array();
  87
  88     /**
  89      * An array of users who have roles within this course but who have not
  90      * been enrolled in the course
  91      * @var array
  92      */
  93     protected $otherusers = array();
  94
  95     /**
  96      * The total number of users who hold a role within the course but who
  97      * arn't enrolled.
  98      * @var int
  99      */
 100     protected $totalotherusers = null;
 101
 102     /**
 103      * The current moodle_page object
 104      * @var moodle_page
 105      */
 106     protected $moodlepage = null;
 107
 108     /**#@+
 109      * These variables are used to cache the information this class uses
 110      * please never use these directly instead use their get_ counterparts.
 111      * @access private
 112      * @var array
 113      */
 114     private $_instancessql = null;
 115     private $_instances = null;
 116     private $_inames = null;
 117     private $_plugins = null;
 118     private $_allplugins = null;
 119     private $_roles = null;
 120     private $_visibleroles = null;
 121     private $_assignableroles = null;
 122     private $_assignablerolesothers = null;
 123     private $_groups = null;
 124     /**#@-*/
 125
 126     /**
 127      * Constructs the course enrolment manager
 128      *
 129      * @param moodle_page $moodlepage
 130      * @param stdClass $course
 131      * @param string $instancefilter
 132      * @param int $rolefilter If non-zero, filters to users with specified role
 133      * @param string $searchfilter If non-blank, filters to users with search text
 134      * @param int $groupfilter if non-zero, filter users with specified group
 135      * @param int $statusfilter if not -1, filter users with active/inactive enrollment.
 136      */
 137     public function __construct(moodle_page $moodlepage, $course, $instancefilter = null,
 138             $rolefilter = 0, $searchfilter = '', $groupfilter = 0, $statusfilter = -1) {
 139         $this->moodlepage = $moodlepage;
 140         $this->context = context_course::instance($course->id);
 141         $this->course = $course;
 142         $this->instancefilter = $instancefilter;
 143         $this->rolefilter = $rolefilter;
 144         $this->searchfilter = $searchfilter;
 145         $this->groupfilter = $groupfilter;
 146         $this->statusfilter = $statusfilter;
 147     }
 148
 149     /**
 150      * Returns the current moodle page
 151      * @return moodle_page
 152      */
 153     public function get_moodlepage() {
 154         return $this->moodlepage;
 155     }
 156
 157     /**
 158      * Returns the total number of enrolled users in the course.
 159      *
 160      * If a filter was specificed this will be the total number of users enrolled
 161      * in this course by means of that instance.
 162      *
 163      * @global moodle_database $DB
 164      * @return int
 165      */
 166     public function get_total_users() {
 167         global $DB;
 168         if ($this->totalusers === null) {
 169             list($instancessql, $params, $filter) = $this->get_instance_sql();
 170             list($filtersql, $moreparams) = $this->get_filter_sql();
 171             $params += $moreparams;
 172             $sqltotal = "SELECT COUNT(DISTINCT u.id)
 173                            FROM {user} u
 174                            JOIN {user_enrolments} ue ON (ue.userid = u.id  AND ue.enrolid $instancessql)
 175                            JOIN {enrol} e ON (e.id = ue.enrolid)";
 176             if ($this->groupfilter) {
 177                 $sqltotal .= " LEFT JOIN ({groups_members} gm JOIN {groups} g ON (g.id = gm.groupid))
 178                                          ON (u.id = gm.userid AND g.courseid = e.courseid)";
 179             }
 180             $sqltotal .= "WHERE $filtersql";
 181             $this->totalusers = (int)$DB->count_records_sql($sqltotal, $params);
 182         }
 183         return $this->totalusers;
 184     }
 185
 186     /**
 187      * Returns the total number of enrolled users in the course.
 188      *
 189      * If a filter was specificed this will be the total number of users enrolled
 190      * in this course by means of that instance.
 191      *
 192      * @global moodle_database $DB
 193      * @return int
 194      */
 195     public function get_total_other_users() {
 196         global $DB;
 197         if ($this->totalotherusers === null) {
 198             list($ctxcondition, $params) = $DB->get_in_or_equal($this->context->get_parent_context_ids(true), SQL_PARAMS_NAMED, 'ctx');
 199             $params['courseid'] = $this->course->id;
 200             $sql = "SELECT COUNT(DISTINCT u.id)
 201                       FROM {role_assignments} ra
 202                       JOIN {user} u ON u.id = ra.userid
 203                       JOIN {context} ctx ON ra.contextid = ctx.id
 204                  LEFT JOIN (
 205                            SELECT ue.id, ue.userid
 206                              FROM {user_enrolments} ue
 207                         LEFT JOIN {enrol} e ON e.id=ue.enrolid
 208                             WHERE e.courseid = :courseid
 209                          ) ue ON ue.userid=u.id
 210                      WHERE ctx.id $ctxcondition AND
 211                            ue.id IS NULL";
 212             $this->totalotherusers = (int)$DB->count_records_sql($sql, $params);
 213         }
 214         return $this->totalotherusers;
 215     }
 216
 217     /**
 218      * Gets all of the users enrolled in this course.
 219      *
 220      * If a filter was specified this will be the users who were enrolled
 221      * in this course by means of that instance. If role or search filters were
 222      * specified then these will also be applied.
 223      *
 224      * @global moodle_database $DB
 225      * @param string $sort
 226      * @param string $direction ASC or DESC
 227      * @param int $page First page should be 0
 228      * @param int $perpage Defaults to 25
 229      * @return array
 230      */
 231     public function get_users($sort, $direction='ASC', $page=0, $perpage=25) {
 232         global $DB;
 233         if ($direction !== 'ASC') {
 234             $direction = 'DESC';
 235         }
 236         $key = md5("$sort-$direction-$page-$perpage");
 237         if (!array_key_exists($key, $this->users)) {
 238             list($instancessql, $params, $filter) = $this->get_instance_sql();
 239             list($filtersql, $moreparams) = $this->get_filter_sql();
 240             $params += $moreparams;
 241             $extrafields = get_extra_user_fields($this->get_context());
 242             $extrafields[] = 'lastaccess';
 243             $ufields = user_picture::fields('u', $extrafields);
 244             $sql = "SELECT DISTINCT $ufields, COALESCE(ul.timeaccess, 0) AS lastcourseaccess
 245                       FROM {user} u
 246                       JOIN {user_enrolments} ue ON (ue.userid = u.id  AND ue.enrolid $instancessql)
 247                       JOIN {enrol} e ON (e.id = ue.enrolid)
 248                  LEFT JOIN {user_lastaccess} ul ON (ul.courseid = e.courseid AND ul.userid = u.id)";
 249             if ($this->groupfilter) {
 250                 $sql .= " LEFT JOIN ({groups_members} gm JOIN {groups} g ON (g.id = gm.groupid))
 251                                     ON (u.id = gm.userid AND g.courseid = e.courseid)";
 252             }
 253             $sql .= "WHERE $filtersql
 254                   ORDER BY $sort $direction";
 255             $this->users[$key] = $DB->get_records_sql($sql, $params, $page*$perpage, $perpage);
 256         }
 257         return $this->users[$key];
 258     }
 259
 260     /**
 261      * Obtains WHERE clause to filter results by defined search and role filter
 262      * (instance filter is handled separately in JOIN clause, see
 263      * get_instance_sql).
 264      *
 265      * @return array Two-element array with SQL and params for WHERE clause
 266      */
 267     protected function get_filter_sql() {
 268         global $DB;
 269
 270         // Search condition.
 271         $extrafields = get_extra_user_fields($this->get_context());
 272         list($sql, $params) = users_search_sql($this->searchfilter, 'u', true, $extrafields);
 273
 274         // Role condition.
 275         if ($this->rolefilter) {
 276             // Get context SQL.
 277             $contextids = $this->context->get_parent_context_ids();
 278             $contextids[] = $this->context->id;
 279             list($contextsql, $contextparams) = $DB->get_in_or_equal($contextids, SQL_PARAMS_NAMED);
 280             $params += $contextparams;
 281
 282             // Role check condition.
 283             $sql .= " AND (SELECT COUNT(1) FROM {role_assignments} ra WHERE ra.userid = u.id " .
 284                     "AND ra.roleid = :roleid AND ra.contextid $contextsql) > 0";
 285             $params['roleid'] = $this->rolefilter;
 286         }
 287
 288         // Group condition.
 289         if ($this->groupfilter) {
 290             if ($this->groupfilter < 0) {
 291                 // Show users who are not in any group.
 292                 $sql .= " AND gm.groupid IS NULL";
 293             } else {
 294                 $sql .= " AND gm.groupid = :groupid";
 295                 $params['groupid'] = $this->groupfilter;
 296             }
 297         }
 298
 299         // Status condition.
 300         if ($this->statusfilter === ENROL_USER_ACTIVE) {
 301             $sql .= " AND ue.status = :active AND e.status = :enabled AND ue.timestart < :now1
 302                     AND (ue.timeend = 0 OR ue.timeend > :now2)";
 303             $now = round(time(), -2); // rounding helps caching in DB
 304             $params += array('enabled' => ENROL_INSTANCE_ENABLED,
 305                              'active' => ENROL_USER_ACTIVE,
 306                              'now1' => $now,
 307                              'now2' => $now);
 308         } else if ($this->statusfilter === ENROL_USER_SUSPENDED) {
 309             $sql .= " AND (ue.status = :inactive OR e.status = :disabled OR ue.timestart > :now1
 310                     OR (ue.timeend <> 0 AND ue.timeend < :now2))";
 311             $now = round(time(), -2); // rounding helps caching in DB
 312             $params += array('disabled' => ENROL_INSTANCE_DISABLED,
 313                              'inactive' => ENROL_USER_SUSPENDED,
 314                              'now1' => $now,
 315                              'now2' => $now);
 316         }
 317
 318         return array($sql, $params);
 319     }
 320
 321     /**
 322      * Gets and array of other users.
 323      *
 324      * Other users are users who have been assigned roles or inherited roles
 325      * within this course but who have not been enrolled in the course
 326      *
 327      * @global moodle_database $DB
 328      * @param string $sort
 329      * @param string $direction
 330      * @param int $page
 331      * @param int $perpage
 332      * @return array
 333      */
 334     public function get_other_users($sort, $direction='ASC', $page=0, $perpage=25) {
 335         global $DB;
 336         if ($direction !== 'ASC') {
 337             $direction = 'DESC';
 338         }
 339         $key = md5("$sort-$direction-$page-$perpage");
 340         if (!array_key_exists($key, $this->otherusers)) {
 341             list($ctxcondition, $params) = $DB->get_in_or_equal($this->context->get_parent_context_ids(true), SQL_PARAMS_NAMED, 'ctx');
 342             $params['courseid'] = $this->course->id;
 343             $params['cid'] = $this->course->id;
 344             $extrafields = get_extra_user_fields($this->get_context());
 345             $ufields = user_picture::fields('u', $extrafields);
 346             $sql = "SELECT ra.id as raid, ra.contextid, ra.component, ctx.contextlevel, ra.roleid, $ufields,
 347                         coalesce(u.lastaccess,0) AS lastaccess
 348                     FROM {role_assignments} ra
 349                     JOIN {user} u ON u.id = ra.userid
 350                     JOIN {context} ctx ON ra.contextid = ctx.id
 351                LEFT JOIN (
 352                        SELECT ue.id, ue.userid
 353                          FROM {user_enrolments} ue
 354                          JOIN {enrol} e ON e.id = ue.enrolid
 355                         WHERE e.courseid = :courseid
 356                        ) ue ON ue.userid=u.id
 357                    WHERE ctx.id $ctxcondition AND
 358                          ue.id IS NULL
 359                 ORDER BY $sort $direction, ctx.depth DESC";
 360             $this->otherusers[$key] = $DB->get_records_sql($sql, $params, $page*$perpage, $perpage);
 361         }
 362         return $this->otherusers[$key];
 363     }
 364
 365     /**
 366      * Helper method used by {@link get_potential_users()} and {@link search_other_users()}.
 367      *
 368      * @param string $search the search term, if any.
 369      * @param bool $searchanywhere Can the search term be anywhere, or must it be at the start.
 370      * @return array with three elements:
 371      *     string list of fields to SELECT,
 372      *     string contents of SQL WHERE clause,
 373      *     array query params. Note that the SQL snippets use named parameters.
 374      */
 375     protected function get_basic_search_conditions($search, $searchanywhere) {
 376         global $DB, $CFG;
 377
 378         // Add some additional sensible conditions
 379         $tests = array("u.id <> :guestid", 'u.deleted = 0', 'u.confirmed = 1');
 380         $params = array('guestid' => $CFG->siteguest);
 381         if (!empty($search)) {
 382             $conditions = get_extra_user_fields($this->get_context());
 383             foreach (get_all_user_name_fields() as $field) {
 384                 $conditions[] = 'u.'.$field;
 385             }
 386             $conditions[] = $DB->sql_fullname('u.firstname', 'u.lastname');
 387             if ($searchanywhere) {
 388                 $searchparam = '%' . $search . '%';
 389             } else {
 390                 $searchparam = $search . '%';
 391             }
 392             $i = 0;
 393             foreach ($conditions as $key => $condition) {
 394                 $conditions[$key] = $DB->sql_like($condition, ":con{$i}00", false);
 395                 $params["con{$i}00"] = $searchparam;
 396                 $i++;
 397             }
 398             $tests[] = '(' . implode(' OR ', $conditions) . ')';
 399         }
 400         $wherecondition = implode(' AND ', $tests);
 401
 402         $extrafields = get_extra_user_fields($this->get_context(), array('username', 'lastaccess'));
 403         $extrafields[] = 'username';
 404         $extrafields[] = 'lastaccess';
 405         $extrafields[] = 'maildisplay';
 406         $ufields = user_picture::fields('u', $extrafields);
 407
 408         return array($ufields, $params, $wherecondition);
 409     }
 410
 411     /**
 412      * Helper method used by {@link get_potential_users()} and {@link search_other_users()}.
 413      *
 414      * @param string $search the search string, if any.
 415      * @param string $fields the first bit of the SQL when returning some users.
 416      * @param string $countfields fhe first bit of the SQL when counting the users.
 417      * @param string $sql the bulk of the SQL statement.
 418      * @param array $params query parameters.
 419      * @param int $page which page number of the results to show.
 420      * @param int $perpage number of users per page.
 421      * @param int $addedenrollment number of users added to enrollment.
 422      * @param bool $returnexactcount Return the exact total users using count_record or not.
 423      * @return array with two or three elements:
 424      *      int totalusers Number users matching the search. (This element only exist if $returnexactcount was set to true)
 425      *      array users List of user objects returned by the query.
 426      *      boolean moreusers True if there are still more users, otherwise is False.
 427      * @throws dml_exception
 428      */
 429     protected function execute_search_queries($search, $fields, $countfields, $sql, array $params, $page, $perpage,
 430             $addedenrollment = 0, $returnexactcount = false) {
 431         global $DB, $CFG;
 432
 433         list($sort, $sortparams) = users_order_by_sql('u', $search, $this->get_context());
 434         $order = ' ORDER BY ' . $sort;
 435
 436         $totalusers = 0;
 437         $moreusers = false;
 438         $results = [];
 439
 440         $availableusers = $DB->get_records_sql($fields . $sql . $order,
 441                 array_merge($params, $sortparams), ($page * $perpage) - $addedenrollment, $perpage + 1);
 442         if ($availableusers) {
 443             $totalusers = count($availableusers);
 444             $moreusers = $totalusers > $perpage;
 445
 446             if ($moreusers) {
 447                 // We need to discard the last record.
 448                 array_pop($availableusers);
 449             }
 450
 451             if ($returnexactcount && $moreusers) {
 452                 // There is more data. We need to do the exact count.
 453                 $totalusers = $DB->count_records_sql($countfields . $sql, $params);
 454             }
 455         }
 456
 457         $results['users'] = $availableusers;
 458         $results['moreusers'] = $moreusers;
 459
 460         if ($returnexactcount) {
 461             // Include totalusers in result if $returnexactcount flag is true.
 462             $results['totalusers'] = $totalusers;
 463         }
 464
 465         return $results;
 466     }
 467
 468     /**
 469      * Gets an array of the users that can be enrolled in this course.
 470      *
 471      * @global moodle_database $DB
 472      * @param int $enrolid
 473      * @param string $search
 474      * @param bool $searchanywhere
 475      * @param int $page Defaults to 0
 476      * @param int $perpage Defaults to 25
 477      * @param int $addedenrollment Defaults to 0
 478      * @param bool $returnexactcount Return the exact total users using count_record or not.
 479      * @return array with two or three elements:
 480      *      int totalusers Number users matching the search. (This element only exist if $returnexactcount was set to true)
 481      *      array users List of user objects returned by the query.
 482      *      boolean moreusers True if there are still more users, otherwise is False.
 483      * @throws dml_exception
 484      */
 485     public function get_potential_users($enrolid, $search = '', $searchanywhere = false, $page = 0, $perpage = 25,
 486             $addedenrollment = 0, $returnexactcount = false) {
 487         global $DB;
 488
 489         list($ufields, $params, $wherecondition) = $this->get_basic_search_conditions($search, $searchanywhere);
 490
 491         $fields      = 'SELECT '.$ufields;
 492         $countfields = 'SELECT COUNT(1)';
 493         $sql = " FROM {user} u
 494             LEFT JOIN {user_enrolments} ue ON (ue.userid = u.id AND ue.enrolid = :enrolid)
 495                 WHERE $wherecondition
 496                       AND ue.id IS NULL";
 497         $params['enrolid'] = $enrolid;
 498
 499         return $this->execute_search_queries($search, $fields, $countfields, $sql, $params, $page, $perpage, $addedenrollment,
 500                 $returnexactcount);
 501     }
 502
 503     /**
 504      * Searches other users and returns paginated results
 505      *
 506      * @global moodle_database $DB
 507      * @param string $search
 508      * @param bool $searchanywhere
 509      * @param int $page Starting at 0
 510      * @param int $perpage
 511      * @param bool $returnexactcount Return the exact total users using count_record or not.
 512      * @return array with two or three elements:
 513      *      int totalusers Number users matching the search. (This element only exist if $returnexactcount was set to true)
 514      *      array users List of user objects returned by the query.
 515      *      boolean moreusers True if there are still more users, otherwise is False.
 516      * @throws dml_exception
 517      */
 518     public function search_other_users($search = '', $searchanywhere = false, $page = 0, $perpage = 25, $returnexactcount = false) {
 519         global $DB, $CFG;
 520
 521         list($ufields, $params, $wherecondition) = $this->get_basic_search_conditions($search, $searchanywhere);
 522
 523         $fields      = 'SELECT ' . $ufields;
 524         $countfields = 'SELECT COUNT(u.id)';
 525         $sql   = " FROM {user} u
 526               LEFT JOIN {role_assignments} ra ON (ra.userid = u.id AND ra.contextid = :contextid)
 527                   WHERE $wherecondition
 528                     AND ra.id IS NULL";
 529         $params['contextid'] = $this->context->id;
 530
 531         return $this->execute_search_queries($search, $fields, $countfields, $sql, $params, $page, $perpage, 0, $returnexactcount);
 532     }
 533
 534     /**
 535      * Searches through the enrolled users in this course.
 536      *
 537      * @param string $search The search term.
 538      * @param bool $searchanywhere Can the search term be anywhere, or must it be at the start.
 539      * @param int $page Starting at 0.
 540      * @param int $perpage Number of users returned per page.
 541      * @param bool $returnexactcount Return the exact total users using count_record or not.
 542      * @return array with two or three elements:
 543      *      int totalusers Number users matching the search. (This element only exist if $returnexactcount was set to true)
 544      *      array users List of user objects returned by the query.
 545      *      boolean moreusers True if there are still more users, otherwise is False.
 546      */
 547     public function search_users(string $search = '', bool $searchanywhere = false, int $page = 0, int $perpage = 25,
 548             bool $returnexactcount = false) {
 549         list($ufields, $params, $wherecondition) = $this->get_basic_search_conditions($search, $searchanywhere);
 550
 551         $fields      = 'SELECT ' . $ufields;
 552         $countfields = 'SELECT COUNT(u.id)';
 553         $sql = " FROM {user} u
 554                  JOIN {user_enrolments} ue ON ue.userid = u.id
 555                  JOIN {enrol} e ON ue.enrolid = e.id
 556                 WHERE $wherecondition
 557                   AND e.courseid = :courseid";
 558         $params['courseid'] = $this->course->id;
 559
 560         return $this->execute_search_queries($search, $fields, $countfields, $sql, $params, $page, $perpage, 0, $returnexactcount);
 561     }
 562
 563     /**
 564      * Gets an array containing some SQL to user for when selecting, params for
 565      * that SQL, and the filter that was used in constructing the sql.
 566      *
 567      * @global moodle_database $DB
 568      * @return string
 569      */
 570     protected function get_instance_sql() {
 571         global $DB;
 572         if ($this->_instancessql === null) {
 573             $instances = $this->get_enrolment_instances();
 574             $filter = $this->get_enrolment_filter();
 575             if ($filter && array_key_exists($filter, $instances)) {
 576                 $sql = " = :ifilter";
 577                 $params = array('ifilter'=>$filter);
 578             } else {
 579                 $filter = 0;
 580                 if ($instances) {
 581                     list($sql, $params) = $DB->get_in_or_equal(array_keys($this->get_enrolment_instances()), SQL_PARAMS_NAMED);
 582                 } else {
 583                     // no enabled instances, oops, we should probably say something
 584                     $sql = "= :never";
 585                     $params = array('never'=>-1);
 586                 }
 587             }
 588             $this->instancefilter = $filter;
 589             $this->_instancessql = array($sql, $params, $filter);
 590         }
 591         return $this->_instancessql;
 592     }
 593
 594     /**
 595      * Returns all of the enrolment instances for this course.
 596      *
 597      * @param bool $onlyenabled Whether to return data from enabled enrolment instance names only.
 598      * @return array
 599      */
 600     public function get_enrolment_instances($onlyenabled = false) {
 601         if ($this->_instances === null) {
 602             $this->_instances = enrol_get_instances($this->course->id, $onlyenabled);
 603         }
 604         return $this->_instances;
 605     }
 606
 607     /**
 608      * Returns the names for all of the enrolment instances for this course.
 609      *
 610      * @param bool $onlyenabled Whether to return data from enabled enrolment instance names only.
 611      * @return array
 612      */
 613     public function get_enrolment_instance_names($onlyenabled = false) {
 614         if ($this->_inames === null) {
 615             $instances = $this->get_enrolment_instances($onlyenabled);
 616             $plugins = $this->get_enrolment_plugins(false);
 617             foreach ($instances as $key=>$instance) {
 618                 if (!isset($plugins[$instance->enrol])) {
 619                     // weird, some broken stuff in plugin
 620                     unset($instances[$key]);
 621                     continue;
 622                 }
 623                 $this->_inames[$key] = $plugins[$instance->enrol]->get_instance_name($instance);
 624             }
 625         }
 626         return $this->_inames;
 627     }
 628
 629     /**
 630      * Gets all of the enrolment plugins that are available for this course.
 631      *
 632      * @param bool $onlyenabled return only enabled enrol plugins
 633      * @return array
 634      */
 635     public function get_enrolment_plugins($onlyenabled = true) {
 636         if ($this->_plugins === null) {
 637             $this->_plugins = enrol_get_plugins(true);
 638         }
 639
 640         if ($onlyenabled) {
 641             return $this->_plugins;
 642         }
 643
 644         if ($this->_allplugins === null) {
 645             // Make sure we have the same objects in _allplugins and _plugins.
 646             $this->_allplugins = $this->_plugins;
 647             foreach (enrol_get_plugins(false) as $name=>$plugin) {
 648                 if (!isset($this->_allplugins[$name])) {
 649                     $this->_allplugins[$name] = $plugin;
 650                 }
 651             }
 652         }
 653
 654         return $this->_allplugins;
 655     }
 656
 657     /**
 658      * Gets all of the roles this course can contain.
 659      *
 660      * @return array
 661      */
 662     public function get_all_roles() {
 663         if ($this->_roles === null) {
 664             $this->_roles = role_fix_names(get_all_roles($this->context), $this->context);
 665         }
 666         return $this->_roles;
 667     }
 668
 669     /**
 670      * Gets all of the roles this course can contain.
 671      *
 672      * @return array
 673      */
 674     public function get_viewable_roles() {
 675         if ($this->_visibleroles === null) {
 676             $this->_visibleroles = get_viewable_roles($this->context);
 677         }
 678         return $this->_visibleroles;
 679     }
 680
 681     /**
 682      * Gets all of the assignable roles for this course.
 683      *
 684      * @return array
 685      */
 686     public function get_assignable_roles($otherusers = false) {
 687         if ($this->_assignableroles === null) {
 688             $this->_assignableroles = get_assignable_roles($this->context, ROLENAME_ALIAS, false); // verifies unassign access control too
 689         }
 690
 691         if ($otherusers) {
 692             if (!is_array($this->_assignablerolesothers)) {
 693                 $this->_assignablerolesothers = array();
 694                 list($courseviewroles, $ignored) = get_roles_with_cap_in_context($this->context, 'moodle/course:view');
 695                 foreach ($this->_assignableroles as $roleid=>$role) {
 696                     if (isset($courseviewroles[$roleid])) {
 697                         $this->_assignablerolesothers[$roleid] = $role;
 698                     }
 699                 }
 700             }
 701             return $this->_assignablerolesothers;
 702         } else {
 703             return $this->_assignableroles;
 704         }
 705     }
 706
 707     /**
 708      * Gets all of the assignable roles for this course, wrapped in an array to ensure
 709      * role sort order is not lost during json deserialisation.
 710      *
 711      * @param boolean $otherusers whether to include the assignable roles for other users
 712      * @return array
 713      */
 714     public function get_assignable_roles_for_json($otherusers = false) {
 715         $rolesarray = array();
 716         $assignable = $this->get_assignable_roles($otherusers);
 717         foreach ($assignable as $id => $role) {
 718             $rolesarray[] = array('id' => $id, 'name' => $role);
 719         }
 720         return $rolesarray;
 721     }
 722
 723     /**
 724      * Gets all of the groups for this course.
 725      *
 726      * @return array
 727      */
 728     public function get_all_groups() {
 729         if ($this->_groups === null) {
 730             $this->_groups = groups_get_all_groups($this->course->id);
 731             foreach ($this->_groups as $gid=>$group) {
 732                 $this->_groups[$gid]->name = format_string($group->name);
 733             }
 734         }
 735         return $this->_groups;
 736     }
 737
 738     /**
 739      * Unenrols a user from the course given the users ue entry
 740      *
 741      * @global moodle_database $DB
 742      * @param stdClass $ue
 743      * @return bool
 744      */
 745     public function unenrol_user($ue) {
 746         global $DB;
 747         list ($instance, $plugin) = $this->get_user_enrolment_components($ue);
 748         if ($instance && $plugin && $plugin->allow_unenrol_user($instance, $ue) && has_capability("enrol/$instance->enrol:unenrol", $this->context)) {
 749             $plugin->unenrol_user($instance, $ue->userid);
 750             return true;
 751         }
 752         return false;
 753     }
 754
 755     /**
 756      * Given a user enrolment record this method returns the plugin and enrolment
 757      * instance that relate to it.
 758      *
 759      * @param stdClass|int $userenrolment
 760      * @return array array($instance, $plugin)
 761      */
 762     public function get_user_enrolment_components($userenrolment) {
 763         global $DB;
 764         if (is_numeric($userenrolment)) {
 765             $userenrolment = $DB->get_record('user_enrolments', array('id'=>(int)$userenrolment));
 766         }
 767         $instances = $this->get_enrolment_instances();
 768         $plugins = $this->get_enrolment_plugins(false);
 769         if (!$userenrolment || !isset($instances[$userenrolment->enrolid])) {
 770             return array(false, false);
 771         }
 772         $instance = $instances[$userenrolment->enrolid];
 773         $plugin = $plugins[$instance->enrol];
 774         return array($instance, $plugin);
 775     }
 776
 777     /**
 778      * Removes an assigned role from a user.
 779      *
 780      * @global moodle_database $DB
 781      * @param int $userid
 782      * @param int $roleid
 783      * @return bool
 784      */
 785     public function unassign_role_from_user($userid, $roleid) {
 786         global $DB;
 787         // Admins may unassign any role, others only those they could assign.
 788         if (!is_siteadmin() and !array_key_exists($roleid, $this->get_assignable_roles())) {
 789             if (defined('AJAX_SCRIPT')) {
 790                 throw new moodle_exception('invalidrole');
 791             }
 792             return false;
 793         }
 794         $user = $DB->get_record('user', array('id'=>$userid), '*', MUST_EXIST);
 795         $ras = $DB->get_records('role_assignments', array('contextid'=>$this->context->id, 'userid'=>$user->id, 'roleid'=>$roleid));
 796         foreach ($ras as $ra) {
 797             if ($ra->component) {
 798                 if (strpos($ra->component, 'enrol_') !== 0) {
 799                     continue;
 800                 }
 801                 if (!$plugin = enrol_get_plugin(substr($ra->component, 6))) {
 802                     continue;
 803                 }
 804                 if ($plugin->roles_protected()) {
 805                     continue;
 806                 }
 807             }
 808             role_unassign($ra->roleid, $ra->userid, $ra->contextid, $ra->component, $ra->itemid);
 809         }
 810         return true;
 811     }
 812
 813     /**
 814      * Assigns a role to a user.
 815      *
 816      * @param int $roleid
 817      * @param int $userid
 818      * @return int|false
 819      */
 820     public function assign_role_to_user($roleid, $userid) {
 821         require_capability('moodle/role:assign', $this->context);
 822         if (!array_key_exists($roleid, $this->get_assignable_roles())) {
 823             if (defined('AJAX_SCRIPT')) {
 824                 throw new moodle_exception('invalidrole');
 825             }
 826             return false;
 827         }
 828         return role_assign($roleid, $userid, $this->context->id, '', NULL);
 829     }
 830
 831     /**
 832      * Adds a user to a group
 833      *
 834      * @param stdClass $user
 835      * @param int $groupid
 836      * @return bool
 837      */
 838     public function add_user_to_group($user, $groupid) {
 839         require_capability('moodle/course:managegroups', $this->context);
 840         $group = $this->get_group($groupid);
 841         if (!$group) {
 842             return false;
 843         }
 844         return groups_add_member($group->id, $user->id);
 845     }
 846
 847     /**
 848      * Removes a user from a group
 849      *
 850      * @global moodle_database $DB
 851      * @param StdClass $user
 852      * @param int $groupid
 853      * @return bool
 854      */
 855     public function remove_user_from_group($user, $groupid) {
 856         global $DB;
 857         require_capability('moodle/course:managegroups', $this->context);
 858         $group = $this->get_group($groupid);
 859         if (!groups_remove_member_allowed($group, $user)) {
 860             return false;
 861         }
 862         if (!$group) {
 863             return false;
 864         }
 865         return groups_remove_member($group, $user);
 866     }
 867
 868     /**
 869      * Gets the requested group
 870      *
 871      * @param int $groupid
 872      * @return stdClass|int
 873      */
 874     public function get_group($groupid) {
 875         $groups = $this->get_all_groups();
 876         if (!array_key_exists($groupid, $groups)) {
 877             return false;
 878         }
 879         return $groups[$groupid];
 880     }
 881
 882     /**
 883      * Edits an enrolment
 884      *
 885      * @param stdClass $userenrolment
 886      * @param stdClass $data
 887      * @return bool
 888      */
 889     public function edit_enrolment($userenrolment, $data) {
 890         //Only allow editing if the user has the appropriate capability
 891         //Already checked in /user/index.php but checking again in case this function is called from elsewhere
 892         list($instance, $plugin) = $this->get_user_enrolment_components($userenrolment);
 893         if ($instance && $plugin && $plugin->allow_manage($instance) && has_capability("enrol/$instance->enrol:manage", $this->context)) {
 894             if (!isset($data->status)) {
 895                 $data->status = $userenrolment->status;
 896             }
 897             $plugin->update_user_enrol($instance, $userenrolment->userid, $data->status, $data->timestart, $data->timeend);
 898             return true;
 899         }
 900         return false;
 901     }
 902
 903     /**
 904      * Returns the current enrolment filter that is being applied by this class
 905      * @return string
 906      */
 907     public function get_enrolment_filter() {
 908         return $this->instancefilter;
 909     }
 910
 911     /**
 912      * Gets the roles assigned to this user that are applicable for this course.
 913      *
 914      * @param int $userid
 915      * @return array
 916      */
 917     public function get_user_roles($userid) {
 918         $roles = array();
 919         $ras = get_user_roles($this->context, $userid, true, 'c.contextlevel DESC, r.sortorder ASC');
 920         $plugins = $this->get_enrolment_plugins(false);
 921         foreach ($ras as $ra) {
 922             if ($ra->contextid != $this->context->id) {
 923                 if (!array_key_exists($ra->roleid, $roles)) {
 924                     $roles[$ra->roleid] = null;
 925                 }
 926                 // higher ras, course always takes precedence
 927                 continue;
 928             }
 929             if (array_key_exists($ra->roleid, $roles) && $roles[$ra->roleid] === false) {
 930                 continue;
 931             }
 932             $changeable = true;
 933             if ($ra->component) {
 934                 $changeable = false;
 935                 if (strpos($ra->component, 'enrol_') === 0) {
 936                     $plugin = substr($ra->component, 6);
 937                     if (isset($plugins[$plugin])) {
 938                         $changeable = !$plugins[$plugin]->roles_protected();
 939                     }
 940                 }
 941             }
 942
 943             $roles[$ra->roleid] = $changeable;
 944         }
 945         return $roles;
 946     }
 947
 948     /**
 949      * Gets the enrolments this user has in the course - including all suspended plugins and instances.
 950      *
 951      * @global moodle_database $DB
 952      * @param int $userid
 953      * @return array
 954      */
 955     public function get_user_enrolments($userid) {
 956         global $DB;
 957         list($instancessql, $params, $filter) = $this->get_instance_sql();
 958         $params['userid'] = $userid;
 959         $userenrolments = $DB->get_records_select('user_enrolments', "enrolid $instancessql AND userid = :userid", $params);
 960         $instances = $this->get_enrolment_instances();
 961         $plugins = $this->get_enrolment_plugins(false);
 962         $inames = $this->get_enrolment_instance_names();
 963         foreach ($userenrolments as &$ue) {
 964             $ue->enrolmentinstance     = $instances[$ue->enrolid];
 965             $ue->enrolmentplugin       = $plugins[$ue->enrolmentinstance->enrol];
 966             $ue->enrolmentinstancename = $inames[$ue->enrolmentinstance->id];
 967         }
 968         return $userenrolments;
 969     }
 970
 971     /**
 972      * Gets the groups this user belongs to
 973      *
 974      * @param int $userid
 975      * @return array
 976      */
 977     public function get_user_groups($userid) {
 978         return groups_get_all_groups($this->course->id, $userid, 0, 'g.id');
 979     }
 980
 981     /**
 982      * Retursn an array of params that would go into the URL to return to this
 983      * exact page.
 984      *
 985      * @return array
 986      */
 987     public function get_url_params() {
 988         $args = array(
 989             'id' => $this->course->id
 990         );
 991         if (!empty($this->instancefilter)) {
 992             $args['ifilter'] = $this->instancefilter;
 993         }
 994         if (!empty($this->rolefilter)) {
 995             $args['role'] = $this->rolefilter;
 996         }
 997         if ($this->searchfilter !== '') {
 998             $args['search'] = $this->searchfilter;
 999         }
1000         if (!empty($this->groupfilter)) {
1001             $args['filtergroup'] = $this->groupfilter;
1002         }
1003         if ($this->statusfilter !== -1) {
1004             $args['status'] = $this->statusfilter;
1005         }
1006         return $args;
1007     }
1008
1009     /**
1010      * Returns the course this object is managing enrolments for
1011      *
1012      * @return stdClass
1013      */
1014     public function get_course() {
1015         return $this->course;
1016     }
1017
1018     /**
1019      * Returns the course context
1020      *
1021      * @return context
1022      */
1023     public function get_context() {
1024         return $this->context;
1025     }
1026
1027     /**
1028      * Gets an array of other users in this course ready for display.
1029      *
1030      * Other users are users who have been assigned or inherited roles within this
1031      * course but have not been enrolled.
1032      *
1033      * @param core_enrol_renderer $renderer
1034      * @param moodle_url $pageurl
1035      * @param string $sort
1036      * @param string $direction ASC | DESC
1037      * @param int $page Starting from 0
1038      * @param int $perpage
1039      * @return array
1040      */
1041     public function get_other_users_for_display(core_enrol_renderer $renderer, moodle_url $pageurl, $sort, $direction, $page, $perpage) {
1042
1043         $userroles = $this->get_other_users($sort, $direction, $page, $perpage);
1044         $roles = $this->get_all_roles();
1045         $plugins = $this->get_enrolment_plugins(false);
1046
1047         $context    = $this->get_context();
1048         $now = time();
1049         $extrafields = get_extra_user_fields($context);
1050
1051         $users = array();
1052         foreach ($userroles as $userrole) {
1053             $contextid = $userrole->contextid;
1054             unset($userrole->contextid); // This would collide with user avatar.
1055             if (!array_key_exists($userrole->id, $users)) {
1056                 $users[$userrole->id] = $this->prepare_user_for_display($userrole, $extrafields, $now);
1057             }
1058             $a = new stdClass;
1059             $a->role = $roles[$userrole->roleid]->localname;
1060             if ($contextid == $this->context->id) {
1061                 $changeable = true;
1062                 if ($userrole->component) {
1063                     $changeable = false;
1064                     if (strpos($userrole->component, 'enrol_') === 0) {
1065                         $plugin = substr($userrole->component, 6);
1066                         if (isset($plugins[$plugin])) {
1067                             $changeable = !$plugins[$plugin]->roles_protected();
1068                         }
1069                     }
1070                 }
1071                 $roletext = get_string('rolefromthiscourse', 'enrol', $a);
1072             } else {
1073                 $changeable = false;
1074                 switch ($userrole->contextlevel) {
1075                     case CONTEXT_COURSE :
1076                         // Meta course
1077                         $roletext = get_string('rolefrommetacourse', 'enrol', $a);
1078                         break;
1079                     case CONTEXT_COURSECAT :
1080                         $roletext = get_string('rolefromcategory', 'enrol', $a);
1081                         break;
1082                     case CONTEXT_SYSTEM:
1083                     default:
1084                         $roletext = get_string('rolefromsystem', 'enrol', $a);
1085                         break;
1086                 }
1087             }
1088             if (!isset($users[$userrole->id]['roles'])) {
1089                 $users[$userrole->id]['roles'] = array();
1090             }
1091             $users[$userrole->id]['roles'][$userrole->roleid] = array(
1092                 'text' => $roletext,
1093                 'unchangeable' => !$changeable
1094             );
1095         }
1096         return $users;
1097     }
1098
1099     /**
1100      * Gets an array of users for display, this includes minimal user information
1101      * as well as minimal information on the users roles, groups, and enrolments.
1102      *
1103      * @param core_enrol_renderer $renderer
1104      * @param moodle_url $pageurl
1105      * @param int $sort
1106      * @param string $direction ASC or DESC
1107      * @param int $page
1108      * @param int $perpage
1109      * @return array
1110      */
1111     public function get_users_for_display(course_enrolment_manager $manager, $sort, $direction, $page, $perpage) {
1112         $pageurl = $manager->get_moodlepage()->url;
1113         $users = $this->get_users($sort, $direction, $page, $perpage);
1114
1115         $now = time();
1116         $straddgroup = get_string('addgroup', 'group');
1117         $strunenrol = get_string('unenrol', 'enrol');
1118         $stredit = get_string('edit');
1119
1120         $visibleroles   = $this->get_viewable_roles();
1121         $assignable = $this->get_assignable_roles();
1122         $allgroups  = $this->get_all_groups();
1123         $context    = $this->get_context();
1124         $canmanagegroups = has_capability('moodle/course:managegroups', $context);
1125
1126         $url = new moodle_url($pageurl, $this->get_url_params());
1127         $extrafields = get_extra_user_fields($context);
1128
1129         $enabledplugins = $this->get_enrolment_plugins(true);
1130
1131         $userdetails = array();
1132         foreach ($users as $user) {
1133             $details = $this->prepare_user_for_display($user, $extrafields, $now);
1134
1135             // Roles
1136             $details['roles'] = array();
1137             foreach ($this->get_user_roles($user->id) as $rid=>$rassignable) {
1138                 $unchangeable = !$rassignable;
1139                 if (!is_siteadmin() and !isset($assignable[$rid])) {
1140                     $unchangeable = true;
1141                 }
1142
1143                 if (isset($visibleroles[$rid])) {
1144                     $label = $visibleroles[$rid];
1145                 } else {
1146                     $label = get_string('novisibleroles', 'role');
1147                     $unchangeable = true;
1148                 }
1149
1150                 $details['roles'][$rid] = array('text' => $label, 'unchangeable' => $unchangeable);
1151             }
1152
1153             // Users
1154             $usergroups = $this->get_user_groups($user->id);
1155             $details['groups'] = array();
1156             foreach($usergroups as $gid=>$unused) {
1157                 $details['groups'][$gid] = $allgroups[$gid]->name;
1158             }
1159
1160             // Enrolments
1161             $details['enrolments'] = array();
1162             foreach ($this->get_user_enrolments($user->id) as $ue) {
1163                 if (!isset($enabledplugins[$ue->enrolmentinstance->enrol])) {
1164                     $details['enrolments'][$ue->id] = array(
1165                         'text' => $ue->enrolmentinstancename,
1166                         'period' => null,
1167                         'dimmed' =>  true,
1168                         'actions' => array()
1169                     );
1170                     continue;
1171                 } else if ($ue->timestart and $ue->timeend) {
1172                     $period = get_string('periodstartend', 'enrol', array('start'=>userdate($ue->timestart), 'end'=>userdate($ue->timeend)));
1173                     $periodoutside = ($ue->timestart && $ue->timeend && ($now < $ue->timestart || $now > $ue->timeend));
1174                 } else if ($ue->timestart) {
1175                     $period = get_string('periodstart', 'enrol', userdate($ue->timestart));
1176                     $periodoutside = ($ue->timestart && $now < $ue->timestart);
1177                 } else if ($ue->timeend) {
1178                     $period = get_string('periodend', 'enrol', userdate($ue->timeend));
1179                     $periodoutside = ($ue->timeend && $now > $ue->timeend);
1180                 } else {
1181                     // If there is no start or end show when user was enrolled.
1182                     $period = get_string('periodnone', 'enrol', userdate($ue->timecreated));
1183                     $periodoutside = false;
1184                 }
1185                 $details['enrolments'][$ue->id] = array(
1186                     'text' => $ue->enrolmentinstancename,
1187                     'period' => $period,
1188                     'dimmed' =>  ($periodoutside or $ue->status != ENROL_USER_ACTIVE or $ue->enrolmentinstance->status != ENROL_INSTANCE_ENABLED),
1189                     'actions' => $ue->enrolmentplugin->get_user_enrolment_actions($manager, $ue)
1190                 );
1191             }
1192             $userdetails[$user->id] = $details;
1193         }
1194         return $userdetails;
1195     }
1196
1197     /**
1198      * Prepare a user record for display
1199      *
1200      * This function is called by both {@link get_users_for_display} and {@link get_other_users_for_display} to correctly
1201      * prepare user fields for display
1202      *
1203      * Please note that this function does not check capability for moodle/coures:viewhiddenuserfields
1204      *
1205      * @param object $user The user record
1206      * @param array $extrafields The list of fields as returned from get_extra_user_fields used to determine which
1207      * additional fields may be displayed
1208      * @param int $now The time used for lastaccess calculation
1209      * @return array The fields to be displayed including userid, courseid, picture, firstname, lastcourseaccess, lastaccess and any
1210      * additional fields from $extrafields
1211      */
1212     private function prepare_user_for_display($user, $extrafields, $now) {
1213         $details = array(
1214             'userid'              => $user->id,
1215             'courseid'            => $this->get_course()->id,
1216             'picture'             => new user_picture($user),
1217             'userfullnamedisplay' => fullname($user, has_capability('moodle/site:viewfullnames', $this->get_context())),
1218             'lastaccess'          => get_string('never'),
1219             'lastcourseaccess'    => get_string('never'),
1220         );
1221
1222         foreach ($extrafields as $field) {
1223             $details[$field] = s($user->{$field});
1224         }
1225
1226         // Last time user has accessed the site.
1227         if (!empty($user->lastaccess)) {
1228             $details['lastaccess'] = format_time($now - $user->lastaccess);
1229         }
1230
1231         // Last time user has accessed the course.
1232         if (!empty($user->lastcourseaccess)) {
1233             $details['lastcourseaccess'] = format_time($now - $user->lastcourseaccess);
1234         }
1235         return $details;
1236     }
1237
1238     public function get_manual_enrol_buttons() {
1239         $plugins = $this->get_enrolment_plugins(true); // Skip disabled plugins.
1240         $buttons = array();
1241         foreach ($plugins as $plugin) {
1242             $newbutton = $plugin->get_manual_enrol_button($this);
1243             if (is_array($newbutton)) {
1244                 $buttons += $newbutton;
1245             } else if ($newbutton instanceof enrol_user_button) {
1246                 $buttons[] = $newbutton;
1247             }
1248         }
1249         return $buttons;
1250     }
1251
1252     public function has_instance($enrolpluginname) {
1253         // Make sure manual enrolments instance exists
1254         foreach ($this->get_enrolment_instances() as $instance) {
1255             if ($instance->enrol == $enrolpluginname) {
1256                 return true;
1257             }
1258         }
1259         return false;
1260     }
1261
1262     /**
1263      * Returns the enrolment plugin that the course manager was being filtered to.
1264      *
1265      * If no filter was being applied then this function returns false.
1266      *
1267      * @return enrol_plugin
1268      */
1269     public function get_filtered_enrolment_plugin() {
1270         $instances = $this->get_enrolment_instances();
1271         $plugins = $this->get_enrolment_plugins(false);
1272
1273         if (empty($this->instancefilter) || !array_key_exists($this->instancefilter, $instances)) {
1274             return false;
1275         }
1276
1277         $instance = $instances[$this->instancefilter];
1278         return $plugins[$instance->enrol];
1279     }
1280
1281     /**
1282      * Returns and array of users + enrolment details.
1283      *
1284      * Given an array of user id's this function returns and array of user enrolments for those users
1285      * as well as enough user information to display the users name and picture for each enrolment.
1286      *
1287      * @global moodle_database $DB
1288      * @param array $userids
1289      * @return array
1290      */
1291     public function get_users_enrolments(array $userids) {
1292         global $DB;
1293
1294         $instances = $this->get_enrolment_instances();
1295         $plugins = $this->get_enrolment_plugins(false);
1296
1297         if  (!empty($this->instancefilter)) {
1298             $instancesql = ' = :instanceid';
1299             $instanceparams = array('instanceid' => $this->instancefilter);
1300         } else {
1301             list($instancesql, $instanceparams) = $DB->get_in_or_equal(array_keys($instances), SQL_PARAMS_NAMED, 'instanceid0000');
1302         }
1303
1304         $userfields = user_picture::fields('u');
1305         list($idsql, $idparams) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED, 'userid0000');
1306
1307         list($sort, $sortparams) = users_order_by_sql('u');
1308
1309         $sql = "SELECT ue.id AS ueid, ue.status, ue.enrolid, ue.userid, ue.timestart, ue.timeend, ue.modifierid, ue.timecreated, ue.timemodified, $userfields
1310                   FROM {user_enrolments} ue
1311              LEFT JOIN {user} u ON u.id = ue.userid
1312                  WHERE ue.enrolid $instancesql AND
1313                        u.id $idsql
1314               ORDER BY $sort";
1315
1316         $rs = $DB->get_recordset_sql($sql, $idparams + $instanceparams + $sortparams);
1317         $users = array();
1318         foreach ($rs as $ue) {
1319             $user = user_picture::unalias($ue);
1320             $ue->id = $ue->ueid;
1321             unset($ue->ueid);
1322             if (!array_key_exists($user->id, $users)) {
1323                 $user->enrolments = array();
1324                 $users[$user->id] = $user;
1325             }
1326             $ue->enrolmentinstance = $instances[$ue->enrolid];
1327             $ue->enrolmentplugin = $plugins[$ue->enrolmentinstance->enrol];
1328             $users[$user->id]->enrolments[$ue->id] = $ue;
1329         }
1330         $rs->close();
1331         return $users;
1332     }
1333 }
1334
1335 /**
1336  * A button that is used to enrol users in a course
1337  *
1338  * @copyright 2010 Sam Hemelryk
1339  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1340  */
1341 class enrol_user_button extends single_button {
1342
1343     /**
1344      * An array containing JS YUI modules required by this button
1345      * @var array
1346      */
1347     protected $jsyuimodules = array();
1348
1349     /**
1350      * An array containing JS initialisation calls required by this button
1351      * @var array
1352      */
1353     protected $jsinitcalls = array();
1354
1355     /**
1356      * An array strings required by JS for this button
1357      * @var array
1358      */
1359     protected $jsstrings = array();
1360
1361     /**
1362      * Initialises the new enrol_user_button
1363      *
1364      * @staticvar int $count The number of enrol user buttons already created
1365      * @param moodle_url $url
1366      * @param string $label The text to display in the button
1367      * @param string $method Either post or get
1368      */
1369     public function __construct(moodle_url $url, $label, $method = 'post') {
1370         static $count = 0;
1371         $count ++;
1372         parent::__construct($url, $label, $method);
1373         $this->class = 'singlebutton enrolusersbutton';
1374         $this->formid = 'enrolusersbutton-'.$count;
1375     }
1376
1377     /**
1378      * Adds a YUI module call that will be added to the page when the button is used.
1379      *
1380      * @param string|array $modules One or more modules to require
1381      * @param string $function The JS function to call
1382      * @param array $arguments An array of arguments to pass to the function
1383      * @param string $galleryversion Deprecated: The gallery version to use
1384      * @param bool $ondomready If true the call is postponed until the DOM is finished loading
1385      */
1386     public function require_yui_module($modules, $function, array $arguments = null, $galleryversion = null, $ondomready = false) {
1387         if ($galleryversion != null) {
1388             debugging('The galleryversion parameter to yui_module has been deprecated since Moodle 2.3.', DEBUG_DEVELOPER);
1389         }
1390
1391         $js = new stdClass;
1392         $js->modules = (array)$modules;
1393         $js->function = $function;
1394         $js->arguments = $arguments;
1395         $js->ondomready = $ondomready;
1396         $this->jsyuimodules[] = $js;
1397     }
1398
1399     /**
1400      * Adds a JS initialisation call to the page when the button is used.
1401      *
1402      * @param string $function The function to call
1403      * @param array $extraarguments An array of arguments to pass to the function
1404      * @param bool $ondomready If true the call is postponed until the DOM is finished loading
1405      * @param array $module A module definition
1406      */
1407     public function require_js_init_call($function, array $extraarguments = null, $ondomready = false, array $module = null) {
1408         $js = new stdClass;
1409         $js->function = $function;
1410         $js->extraarguments = $extraarguments;
1411         $js->ondomready = $ondomready;
1412         $js->module = $module;
1413         $this->jsinitcalls[] = $js;
1414     }
1415
1416     /**
1417      * Requires strings for JS that will be loaded when the button is used.
1418      *
1419      * @param type $identifiers
1420      * @param string $component
1421      * @param mixed $a
1422      */
1423     public function strings_for_js($identifiers, $component = 'moodle', $a = null) {
1424         $string = new stdClass;
1425         $string->identifiers = (array)$identifiers;
1426         $string->component = $component;
1427         $string->a = $a;
1428         $this->jsstrings[] = $string;
1429     }
1430
1431     /**
1432      * Initialises the JS that is required by this button
1433      *
1434      * @param moodle_page $page
1435      */
1436     public function initialise_js(moodle_page $page) {
1437         foreach ($this->jsyuimodules as $js) {
1438             $page->requires->yui_module($js->modules, $js->function, $js->arguments, null, $js->ondomready);
1439         }
1440         foreach ($this->jsinitcalls as $js) {
1441             $page->requires->js_init_call($js->function, $js->extraarguments, $js->ondomready, $js->module);
1442         }
1443         foreach ($this->jsstrings as $string) {
1444             $page->requires->strings_for_js($string->identifiers, $string->component, $string->a);
1445         }
1446     }
1447 }
1448
1449 /**
1450  * User enrolment action
1451  *
1452  * This class is used to manage a renderable ue action such as editing an user enrolment or deleting
1453  * a user enrolment.
1454  *
1455  * @copyright  2011 Sam Hemelryk
1456  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1457  */
1458 class user_enrolment_action implements renderable {
1459
1460     /**
1461      * The icon to display for the action
1462      * @var pix_icon
1463      */
1464     protected $icon;
1465
1466     /**
1467      * The title for the action
1468      * @var string
1469      */
1470     protected $title;
1471
1472     /**
1473      * The URL to the action
1474      * @var moodle_url
1475      */
1476     protected $url;
1477
1478     /**
1479      * An array of HTML attributes
1480      * @var array
1481      */
1482     protected $attributes = array();
1483
1484     /**
1485      * Constructor
1486      * @param pix_icon $icon
1487      * @param string $title
1488      * @param moodle_url $url
1489      * @param array $attributes
1490      */
1491     public function __construct(pix_icon $icon, $title, $url, array $attributes = null) {
1492         $this->icon = $icon;
1493         $this->title = $title;
1494         $this->url = new moodle_url($url);
1495         if (!empty($attributes)) {
1496             $this->attributes = $attributes;
1497         }
1498         $this->attributes['title'] = $title;
1499     }
1500
1501     /**
1502      * Returns the icon for this action
1503      * @return pix_icon
1504      */
1505     public function get_icon() {
1506         return $this->icon;
1507     }
1508
1509     /**
1510      * Returns the title for this action
1511      * @return string
1512      */
1513     public function get_title() {
1514         return $this->title;
1515     }
1516
1517     /**
1518      * Returns the URL for this action
1519      * @return moodle_url
1520      */
1521     public function get_url() {
1522         return $this->url;
1523     }
1524
1525     /**
1526      * Returns the attributes to use for this action
1527      * @return array
1528      */
1529     public function get_attributes() {
1530         return $this->attributes;
1531     }
1532 }
1533
1534 class enrol_ajax_exception extends moodle_exception {
1535     /**
1536      * Constructor
1537      * @param string $errorcode The name of the string from error.php to print
1538      * @param string $module name of module
1539      * @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.
1540      * @param object $a Extra words and phrases that might be required in the error string
1541      * @param string $debuginfo optional debugging information
1542      */
1543     public function __construct($errorcode, $link = '', $a = NULL, $debuginfo = null) {
1544         parent::__construct($errorcode, 'enrol', $link, $a, $debuginfo);
1545     }
1546 }
1547
1548 /**
1549  * This class is used to manage a bulk operations for enrolment plugins.
1550  *
1551  * @copyright 2011 Sam Hemelryk
1552  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1553  */
1554 abstract class enrol_bulk_enrolment_operation {
1555
1556     /**
1557      * The course enrolment manager
1558      * @var course_enrolment_manager
1559      */
1560     protected $manager;
1561
1562     /**
1563      * The enrolment plugin to which this operation belongs
1564      * @var enrol_plugin
1565      */
1566     protected $plugin;
1567
1568     /**
1569      * Contructor
1570      * @param course_enrolment_manager $manager
1571      * @param stdClass $plugin
1572      */
1573     public function __construct(course_enrolment_manager $manager, enrol_plugin $plugin = null) {
1574         $this->manager = $manager;
1575         $this->plugin = $plugin;
1576     }
1577
1578     /**
1579      * Returns a moodleform used for this operation, or false if no form is required and the action
1580      * should be immediatly processed.
1581      *
1582      * @param moodle_url|string $defaultaction
1583      * @param mixed $defaultcustomdata
1584      * @return enrol_bulk_enrolment_change_form|moodleform|false
1585      */
1586     public function get_form($defaultaction = null, $defaultcustomdata = null) {
1587         return false;
1588     }
1589
1590     /**
1591      * Returns the title to use for this bulk operation
1592      *
1593      * @return string
1594      */
1595     abstract public function get_title();
1596
1597     /**
1598      * Returns the identifier for this bulk operation.
1599      * This should be the same identifier used by the plugins function when returning
1600      * all of its bulk operations.
1601      *
1602      * @return string
1603      */
1604     abstract public function get_identifier();
1605
1606     /**
1607      * Processes the bulk operation on the given users
1608      *
1609      * @param course_enrolment_manager $manager
1610      * @param array $users
1611      * @param stdClass $properties
1612      */
1613     abstract public function process(course_enrolment_manager $manager, array $users, stdClass $properties);
1614 }