my/lib.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  * My Moodle -- a user's personal dashboard
  19  *
  20  * This file contains common functions for the dashboard and profile pages.
  21  *
  22  * @package    moodlecore
  23  * @subpackage my
  24  * @copyright  2010 Remote-Learner.net
  25  * @author     Hubert Chathi <hubert@remote-learner.net>
  26  * @author     Olav Jordan <olav.jordan@remote-learner.net>
  27  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  28  */
  29
  30 define('MY_PAGE_PUBLIC', 0);
  31 define('MY_PAGE_PRIVATE', 1);
  32
  33 require_once("$CFG->libdir/blocklib.php");
  34
  35 /*
  36  * For a given user, this returns the $page information for their My Moodle page
  37  *
  38  */
  39 function my_get_page($userid, $private=MY_PAGE_PRIVATE) {
  40     global $DB, $CFG;
  41
  42     if (empty($CFG->forcedefaultmymoodle) && $userid) {  // Ignore custom My Moodle pages if admin has forced them
  43         // Does the user have their own page defined?  If so, return it.
  44         if ($customised = $DB->get_record('my_pages', array('userid' => $userid, 'private' => $private))) {
  45             return $customised;
  46         }
  47     }
  48
  49     // Otherwise return the system default page
  50     return $DB->get_record('my_pages', array('userid' => null, 'name' => '__default', 'private' => $private));
  51 }
  52
  53
  54 /*
  55  * This copies a system default page to the current user
  56  *
  57  */
  58 function my_copy_page($userid, $private=MY_PAGE_PRIVATE, $pagetype='my-index') {
  59     global $DB;
  60
  61     if ($customised = $DB->get_record('my_pages', array('userid' => $userid, 'private' => $private))) {
  62         return $customised;  // We're done!
  63     }
  64
  65     // Get the system default page
  66     if (!$systempage = $DB->get_record('my_pages', array('userid' => null, 'private' => $private))) {
  67         return false;  // error
  68     }
  69
  70     // Clone the basic system page record
  71     $page = clone($systempage);
  72     unset($page->id);
  73     $page->userid = $userid;
  74     $page->id = $DB->insert_record('my_pages', $page);
  75
  76     // Clone ALL the associated blocks as well
  77     $systemcontext = context_system::instance();
  78     $usercontext = context_user::instance($userid);
  79
  80     $blockinstances = $DB->get_records('block_instances', array('parentcontextid' => $systemcontext->id,
  81                                                                 'pagetypepattern' => $pagetype,
  82                                                                 'subpagepattern' => $systempage->id));
  83     $newblockinstanceids = [];
  84     foreach ($blockinstances as $instance) {
  85         $originalid = $instance->id;
  86         unset($instance->id);
  87         $instance->parentcontextid = $usercontext->id;
  88         $instance->subpagepattern = $page->id;
  89         $instance->timecreated = time();
  90         $instance->timemodified = $instance->timecreated;
  91         $instance->id = $DB->insert_record('block_instances', $instance);
  92         $newblockinstanceids[$originalid] = $instance->id;
  93         $blockcontext = context_block::instance($instance->id);  // Just creates the context record
  94         $block = block_instance($instance->blockname, $instance);
  95         if (!$block->instance_copy($originalid)) {
  96             debugging("Unable to copy block-specific data for original block instance: $originalid
  97                 to new block instance: $instance->id", DEBUG_DEVELOPER);
  98         }
  99     }
 100
 101     // Clone block position overrides.
 102     if ($blockpositions = $DB->get_records('block_positions',
 103             ['subpage' => $systempage->id, 'pagetype' => $pagetype, 'contextid' => $systemcontext->id])) {
 104         foreach ($blockpositions as &$positions) {
 105             $positions->subpage = $page->id;
 106             $positions->contextid = $usercontext->id;
 107             if (array_key_exists($positions->blockinstanceid, $newblockinstanceids)) {
 108                 // For block instances that were defined on the default dashboard and copied to the user dashboard
 109                 // use the new blockinstanceid.
 110                 $positions->blockinstanceid = $newblockinstanceids[$positions->blockinstanceid];
 111             }
 112             unset($positions->id);
 113         }
 114         $DB->insert_records('block_positions', $blockpositions);
 115     }
 116
 117     return $page;
 118 }
 119
 120 /*
 121  * For a given user, this deletes their My Moodle page and returns them to the system default.
 122  *
 123  * @param int $userid the id of the user whose page should be reset
 124  * @param int $private either MY_PAGE_PRIVATE or MY_PAGE_PUBLIC
 125  * @param string $pagetype either my-index or user-profile
 126  * @return mixed system page, or false on error
 127  */
 128 function my_reset_page($userid, $private=MY_PAGE_PRIVATE, $pagetype='my-index') {
 129     global $DB, $CFG;
 130
 131     $page = my_get_page($userid, $private);
 132     if ($page->userid == $userid) {
 133         $context = context_user::instance($userid);
 134         if ($blocks = $DB->get_records('block_instances', array('parentcontextid' => $context->id,
 135                 'pagetypepattern' => $pagetype))) {
 136             foreach ($blocks as $block) {
 137                 if (is_null($block->subpagepattern) || $block->subpagepattern == $page->id) {
 138                     blocks_delete_instance($block);
 139                 }
 140             }
 141         }
 142         $DB->delete_records('block_positions', ['subpage' => $page->id, 'pagetype' => $pagetype, 'contextid' => $context->id]);
 143         $DB->delete_records('my_pages', array('id' => $page->id));
 144     }
 145
 146     // Get the system default page
 147     if (!$systempage = $DB->get_record('my_pages', array('userid' => null, 'private' => $private))) {
 148         return false; // error
 149     }
 150
 151     // Trigger dashboard has been reset event.
 152     $eventparams = array(
 153         'context' => context_user::instance($userid),
 154         'other' => array(
 155             'private' => $private,
 156             'pagetype' => $pagetype,
 157         ),
 158     );
 159     $event = \core\event\dashboard_reset::create($eventparams);
 160     $event->trigger();
 161     return $systempage;
 162 }
 163
 164 /**
 165  * Resets the page customisations for all users.
 166  *
 167  * @param int $private Either MY_PAGE_PRIVATE or MY_PAGE_PUBLIC.
 168  * @param string $pagetype Either my-index or user-profile.
 169  * @return void
 170  */
 171 function my_reset_page_for_all_users($private = MY_PAGE_PRIVATE, $pagetype = 'my-index') {
 172     global $DB;
 173
 174     // This may take a while. Raise the execution time limit.
 175     core_php_time_limit::raise();
 176
 177     // Find all the user pages and all block instances in them.
 178     $sql = "SELECT bi.id
 179         FROM {my_pages} p
 180         JOIN {context} ctx ON ctx.instanceid = p.userid AND ctx.contextlevel = :usercontextlevel
 181         JOIN {block_instances} bi ON bi.parentcontextid = ctx.id AND
 182             bi.pagetypepattern = :pagetypepattern AND
 183             (bi.subpagepattern IS NULL OR bi.subpagepattern = " . $DB->sql_concat("''", 'p.id') . ")
 184         WHERE p.private = :private";
 185     $params = array('private' => $private,
 186         'usercontextlevel' => CONTEXT_USER,
 187         'pagetypepattern' => $pagetype);
 188     $blockids = $DB->get_fieldset_sql($sql, $params);
 189
 190     // Wrap the SQL queries in a transaction.
 191     $transaction = $DB->start_delegated_transaction();
 192
 193     // Delete the block instances.
 194     if (!empty($blockids)) {
 195         blocks_delete_instances($blockids);
 196     }
 197
 198     // Finally delete the pages.
 199     $DB->delete_records_select('my_pages', 'userid IS NOT NULL AND private = :private', ['private' => $private]);
 200
 201     // We should be good to go now.
 202     $transaction->allow_commit();
 203
 204     // Trigger dashboard has been reset event.
 205     $eventparams = array(
 206         'context' => context_system::instance(),
 207         'other' => array(
 208             'private' => $private,
 209             'pagetype' => $pagetype,
 210         ),
 211     );
 212     $event = \core\event\dashboards_reset::create($eventparams);
 213     $event->trigger();
 214 }
 215
 216 class my_syspage_block_manager extends block_manager {
 217     // HACK WARNING!
 218     // TODO: figure out a better way to do this
 219     /**
 220      * Load blocks using the system context, rather than the user's context.
 221      *
 222      * This is needed because the My Moodle pages set the page context to the
 223      * user's context for access control, etc.  But the blocks for the system
 224      * pages are stored in the system context.
 225      */
 226     public function load_blocks($includeinvisible = null) {
 227         $origcontext = $this->page->context;
 228         $this->page->context = context_system::instance();
 229         parent::load_blocks($includeinvisible);
 230         $this->page->context = $origcontext;
 231     }
 232 }