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moodle/message/classes/api.php

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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Contains class used to return information to display for the message area.
*
* @package core_message
* @copyright 2016 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core_message;
defined('MOODLE_INTERNAL') || die();
require_once($CFG->dirroot . '/lib/messagelib.php');
/**
* Class used to return information to display for the message area.
*
* @copyright 2016 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class api {
/**
* The action for reading a message.
*/
const MESSAGE_ACTION_READ = 1;
/**
* The action for deleting a message.
*/
const MESSAGE_ACTION_DELETED = 2;
/**
* Handles searching for messages in the message area.
*
* @param int $userid The user id doing the searching
* @param string $search The string the user is searching
* @param int $limitfrom
* @param int $limitnum
* @return array
*/
public static function search_messages($userid, $search, $limitfrom = 0, $limitnum = 0) {
global $DB;
// Get the user fields we want.
$ufields = \user_picture::fields('u', array('lastaccess'), 'userfrom_id', 'userfrom_');
$ufields2 = \user_picture::fields('u2', array('lastaccess'), 'userto_id', 'userto_');
$sql = "SELECT m.id, m.useridfrom, mcm.userid as useridto, m.subject, m.fullmessage, m.fullmessagehtml, m.fullmessageformat,
m.smallmessage, m.timecreated, 0 as isread, $ufields, mcont.blocked as userfrom_blocked, $ufields2,
mcont2.blocked as userto_blocked
FROM {messages} m
INNER JOIN {user} u
ON u.id = m.useridfrom
INNER JOIN {message_conversations} mc
ON mc.id = m.conversationid
INNER JOIN {message_conversation_members} mcm
ON mcm.conversationid = m.conversationid
INNER JOIN {user} u2
ON u2.id = mcm.userid
LEFT JOIN {message_contacts} mcont
ON (mcont.contactid = u.id AND mcont.userid = ?)
LEFT JOIN {message_contacts} mcont2
ON (mcont2.contactid = u2.id AND mcont2.userid = ?)
LEFT JOIN {message_user_actions} mua
ON (mua.messageid = m.id AND mua.userid = ? AND mua.action = ?)
WHERE (m.useridfrom = ? OR mcm.userid = ?)
AND m.useridfrom != mcm.userid
AND u.deleted = 0
AND u2.deleted = 0
AND mua.id is NULL
AND " . $DB->sql_like('smallmessage', '?', false) . "
ORDER BY timecreated DESC";
$params = array($userid, $userid, $userid, self::MESSAGE_ACTION_DELETED, $userid, $userid, '%' . $search . '%');
// Convert the messages into searchable contacts with their last message being the message that was searched.
$conversations = array();
if ($messages = $DB->get_records_sql($sql, $params, $limitfrom, $limitnum)) {
foreach ($messages as $message) {
$prefix = 'userfrom_';
if ($userid == $message->useridfrom) {
$prefix = 'userto_';
// If it from the user, then mark it as read, even if it wasn't by the receiver.
$message->isread = true;
}
$blockedcol = $prefix . 'blocked';
$message->blocked = $message->$blockedcol;
$message->messageid = $message->id;
$conversations[] = helper::create_contact($message, $prefix);
}
}
return $conversations;
}
/**
* Handles searching for user in a particular course in the message area.
*
* @param int $userid The user id doing the searching
* @param int $courseid The id of the course we are searching in
* @param string $search The string the user is searching
* @param int $limitfrom
* @param int $limitnum
* @return array
*/
public static function search_users_in_course($userid, $courseid, $search, $limitfrom = 0, $limitnum = 0) {
global $DB;
// Get all the users in the course.
list($esql, $params) = get_enrolled_sql(\context_course::instance($courseid), '', 0, true);
$sql = "SELECT u.*, mc.blocked
FROM {user} u
JOIN ($esql) je
ON je.id = u.id
LEFT JOIN {message_contacts} mc
ON (mc.contactid = u.id AND mc.userid = :userid)
WHERE u.deleted = 0";
// Add more conditions.
$fullname = $DB->sql_fullname();
$sql .= " AND u.id != :userid2
AND " . $DB->sql_like($fullname, ':search', false) . "
ORDER BY " . $DB->sql_fullname();
$params = array_merge(array('userid' => $userid, 'userid2' => $userid, 'search' => '%' . $search . '%'), $params);
// Convert all the user records into contacts.
$contacts = array();
if ($users = $DB->get_records_sql($sql, $params, $limitfrom, $limitnum)) {
foreach ($users as $user) {
$contacts[] = helper::create_contact($user);
}
}
return $contacts;
}
/**
* Handles searching for user in the message area.
*
* @param int $userid The user id doing the searching
* @param string $search The string the user is searching
* @param int $limitnum
* @return array
*/
public static function search_users($userid, $search, $limitnum = 0) {
global $CFG, $DB;
require_once($CFG->dirroot . '/lib/coursecatlib.php');
// Used to search for contacts.
$fullname = $DB->sql_fullname();
$ufields = \user_picture::fields('u', array('lastaccess'));
// Users not to include.
$excludeusers = array($userid, $CFG->siteguest);
list($exclude, $excludeparams) = $DB->get_in_or_equal($excludeusers, SQL_PARAMS_NAMED, 'param', false);
// Ok, let's search for contacts first.
$contacts = array();
$sql = "SELECT $ufields, mc.blocked
FROM {user} u
JOIN {message_contacts} mc
ON u.id = mc.contactid
WHERE mc.userid = :userid
AND u.deleted = 0
AND u.confirmed = 1
AND " . $DB->sql_like($fullname, ':search', false) . "
AND u.id $exclude
ORDER BY " . $DB->sql_fullname();
if ($users = $DB->get_records_sql($sql, array('userid' => $userid, 'search' => '%' . $search . '%') + $excludeparams,
0, $limitnum)) {
foreach ($users as $user) {
$contacts[] = helper::create_contact($user);
}
}
// Now, let's get the courses.
// Make sure to limit searches to enrolled courses.
$enrolledcourses = enrol_get_my_courses(array('id', 'cacherev'));
$courses = array();
// Really we want the user to be able to view the participants if they have the capability
// 'moodle/course:viewparticipants' or 'moodle/course:enrolreview', but since the search_courses function
// only takes required parameters we can't. However, the chance of a user having 'moodle/course:enrolreview' but
// *not* 'moodle/course:viewparticipants' are pretty much zero, so it is not worth addressing.
if ($arrcourses = \coursecat::search_courses(array('search' => $search), array('limit' => $limitnum),
array('moodle/course:viewparticipants'))) {
foreach ($arrcourses as $course) {
if (isset($enrolledcourses[$course->id])) {
$data = new \stdClass();
$data->id = $course->id;
$data->shortname = $course->shortname;
$data->fullname = $course->fullname;
$courses[] = $data;
}
}
}
// Let's get those non-contacts. Toast them gears boi.
// Note - you can only block contacts, so these users will not be blocked, so no need to get that
// extra detail from the database.
$noncontacts = array();
$sql = "SELECT $ufields
FROM {user} u
WHERE u.deleted = 0
AND u.confirmed = 1
AND " . $DB->sql_like($fullname, ':search', false) . "
AND u.id $exclude
AND u.id NOT IN (SELECT contactid
FROM {message_contacts}
WHERE userid = :userid)
ORDER BY " . $DB->sql_fullname();
if ($users = $DB->get_records_sql($sql, array('userid' => $userid, 'search' => '%' . $search . '%') + $excludeparams,
0, $limitnum)) {
foreach ($users as $user) {
$noncontacts[] = helper::create_contact($user);
}
}
return array($contacts, $courses, $noncontacts);
}
/**
* Returns the contacts and their conversation to display in the contacts area.
*
* ** WARNING **
* It is HIGHLY recommended to use a sensible limit when calling this function. Trying
* to retrieve too much information in a single call will cause performance problems.
* ** WARNING **
*
* This function has specifically been altered to break each of the data sets it
* requires into separate database calls. This is to avoid the performance problems
* observed when attempting to join large data sets (e.g. the message tables and
* the user table).
*
* While it is possible to gather the data in a single query, and it may even be
* more efficient with a correctly tuned database, we have opted to trade off some of
* the benefits of a single query in order to ensure this function will work on
* most databases with default tunings and with large data sets.
*
* @param int $userid The user id
* @param int $limitfrom
* @param int $limitnum
* @return array
*/
public static function get_conversations($userid, $limitfrom = 0, $limitnum = 20) {
global $DB;
// Get the last message from each conversation that the user belongs to.
$sql = "SELECT m.id, m.conversationid, m.useridfrom, mcm2.userid as useridto, m.smallmessage, m.timecreated
FROM {messages} m
INNER JOIN (
SELECT MAX(m.id) AS messageid
FROM {messages} m
INNER JOIN (
SELECT m.conversationid, MAX(m.timecreated) as maxtime
FROM {messages} m
INNER JOIN {message_conversation_members} mcm
ON mcm.conversationid = m.conversationid
LEFT JOIN {message_user_actions} mua
ON (mua.messageid = m.id AND mua.userid = :userid AND mua.action = :action)
WHERE mua.id is NULL
AND mcm.userid = :userid2
GROUP BY m.conversationid
) maxmessage
ON maxmessage.maxtime = m.timecreated AND maxmessage.conversationid = m.conversationid
GROUP BY m.conversationid
) lastmessage
ON lastmessage.messageid = m.id
INNER JOIN {message_conversation_members} mcm
ON mcm.conversationid = m.conversationid
INNER JOIN {message_conversation_members} mcm2
ON mcm2.conversationid = m.conversationid
WHERE mcm.userid = m.useridfrom
AND mcm.id != mcm2.id
ORDER BY m.timecreated DESC";
$messageset = $DB->get_recordset_sql($sql, ['userid' => $userid, 'action' => self::MESSAGE_ACTION_DELETED,
'userid2' => $userid], $limitfrom, $limitnum);
$messages = [];
foreach ($messageset as $message) {
$messages[$message->id] = $message;
}
$messageset->close();
// If there are no messages return early.
if (empty($messages)) {
return [];
}
// We need to pull out the list of other users that are part of each of these conversations. This
// needs to be done in a separate query to avoid doing a join on the messages tables and the user
// tables because on large sites these tables are massive which results in extremely slow
// performance (typically due to join buffer exhaustion).
$otheruserids = array_map(function($message) use ($userid) {
return ($message->useridfrom == $userid) ? $message->useridto : $message->useridfrom;
}, array_values($messages));
// Ok, let's get the other members in the conversations.
list($useridsql, $usersparams) = $DB->get_in_or_equal($otheruserids);
$userfields = \user_picture::fields('u', array('lastaccess'));
$userssql = "SELECT $userfields
FROM {user} u
WHERE id $useridsql
AND deleted = 0";
$otherusers = $DB->get_records_sql($userssql, $usersparams);
// If there are no other users (user may have been deleted), then do not continue.
if (empty($otherusers)) {
return [];
}
$contactssql = "SELECT contactid, blocked
FROM {message_contacts}
WHERE userid = ?
AND contactid $useridsql";
$contacts = $DB->get_records_sql($contactssql, array_merge([$userid], $usersparams));
// Finally, let's get the unread messages count for this user so that we can add them
// to the conversation. Remember we need to ignore the messages the user sent.
$unreadcountssql = 'SELECT m.useridfrom, count(m.id) as count
FROM {messages} m
INNER JOIN {message_conversations} mc
ON mc.id = m.conversationid
INNER JOIN {message_conversation_members} mcm
ON m.conversationid = mcm.conversationid
LEFT JOIN {message_user_actions} mua
ON (mua.messageid = m.id AND mua.userid = ? AND
(mua.action = ? OR mua.action = ?))
WHERE mcm.userid = ?
AND m.useridfrom != ?
AND mua.id is NULL
GROUP BY useridfrom';
$unreadcounts = $DB->get_records_sql($unreadcountssql, [$userid, self::MESSAGE_ACTION_READ, self::MESSAGE_ACTION_DELETED,
$userid, $userid]);
// Get rid of the table prefix.
$userfields = str_replace('u.', '', $userfields);
$userproperties = explode(',', $userfields);
$arrconversations = array();
foreach ($messages as $message) {
$conversation = new \stdClass();
$otheruserid = ($message->useridfrom == $userid) ? $message->useridto : $message->useridfrom;
$otheruser = isset($otherusers[$otheruserid]) ? $otherusers[$otheruserid] : null;
$contact = isset($contacts[$otheruserid]) ? $contacts[$otheruserid] : null;
// It's possible the other user was deleted, so, skip.
if (is_null($otheruser)) {
continue;
}
// Add the other user's information to the conversation, if we have one.
foreach ($userproperties as $prop) {
$conversation->$prop = ($otheruser) ? $otheruser->$prop : null;
}
// Add the contact's information, if we have one.
$conversation->blocked = ($contact) ? $contact->blocked : null;
// Add the message information.
$conversation->messageid = $message->id;
$conversation->smallmessage = $message->smallmessage;
$conversation->useridfrom = $message->useridfrom;
// Only consider it unread if $user has unread messages.
if (isset($unreadcounts[$otheruserid])) {
$conversation->isread = false;
$conversation->unreadcount = $unreadcounts[$otheruserid]->count;
} else {
$conversation->isread = true;
}
$arrconversations[$otheruserid] = helper::create_contact($conversation);
}
return $arrconversations;
}
/**
* Returns the contacts to display in the contacts area.
*
* @param int $userid The user id
* @param int $limitfrom
* @param int $limitnum
* @return array
*/
public static function get_contacts($userid, $limitfrom = 0, $limitnum = 0) {
global $DB;
$arrcontacts = array();
$sql = "SELECT u.*, mc.blocked
FROM {message_contacts} mc
JOIN {user} u
ON mc.contactid = u.id
WHERE mc.userid = :userid
AND u.deleted = 0
ORDER BY " . $DB->sql_fullname();
if ($contacts = $DB->get_records_sql($sql, array('userid' => $userid), $limitfrom, $limitnum)) {
foreach ($contacts as $contact) {
$arrcontacts[] = helper::create_contact($contact);
}
}
return $arrcontacts;
}
/**
* Returns the an array of the users the given user is in a conversation
* with who are a contact and the number of unread messages.
*
* @param int $userid The user id
* @param int $limitfrom
* @param int $limitnum
* @return array
*/
public static function get_contacts_with_unread_message_count($userid, $limitfrom = 0, $limitnum = 0) {
global $DB;
$userfields = \user_picture::fields('u', array('lastaccess'));
$unreadcountssql = "SELECT $userfields, count(m.id) as messagecount
FROM {message_contacts} mc
INNER JOIN {user} u
ON u.id = mc.contactid
LEFT JOIN {messages} m
ON m.useridfrom = mc.contactid
LEFT JOIN {message_conversation_members} mcm
ON mcm.conversationid = m.conversationid AND mcm.userid = ? AND mcm.userid != m.useridfrom
LEFT JOIN {message_user_actions} mua
ON (mua.messageid = m.id AND mua.userid = ? AND mua.action = ?)
WHERE mua.id is NULL
AND mc.userid = ?
AND mc.blocked = 0
AND u.deleted = 0
GROUP BY $userfields";
return $DB->get_records_sql($unreadcountssql, [$userid, $userid, self::MESSAGE_ACTION_READ,
$userid, $userid], $limitfrom, $limitnum);
}
/**
* Returns the an array of the users the given user is in a conversation
* with who are not a contact and the number of unread messages.
*
* @param int $userid The user id
* @param int $limitfrom
* @param int $limitnum
* @return array
*/
public static function get_non_contacts_with_unread_message_count($userid, $limitfrom = 0, $limitnum = 0) {
global $DB;
$userfields = \user_picture::fields('u', array('lastaccess'));
$unreadcountssql = "SELECT $userfields, count(m.id) as messagecount
FROM {user} u
INNER JOIN {messages} m
ON m.useridfrom = u.id
INNER JOIN {message_conversation_members} mcm
ON mcm.conversationid = m.conversationid
LEFT JOIN {message_user_actions} mua
ON (mua.messageid = m.id AND mua.userid = ? AND mua.action = ?)
LEFT JOIN {message_contacts} mc
ON (mc.userid = ? AND mc.contactid = u.id)
WHERE mcm.userid = ?
AND mcm.userid != m.useridfrom
AND mua.id is NULL
AND mc.id is NULL
AND u.deleted = 0
GROUP BY $userfields";
return $DB->get_records_sql($unreadcountssql, [$userid, self::MESSAGE_ACTION_READ, $userid, $userid],
$limitfrom, $limitnum);
}
/**
* Returns the messages to display in the message area.
*
* @param int $userid the current user
* @param int $otheruserid the other user
* @param int $limitfrom
* @param int $limitnum
* @param string $sort
* @param int $timefrom the time from the message being sent
* @param int $timeto the time up until the message being sent
* @return array
*/
public static function get_messages($userid, $otheruserid, $limitfrom = 0, $limitnum = 0,
$sort = 'timecreated ASC', $timefrom = 0, $timeto = 0) {
if (!empty($timefrom)) {
// Check the cache to see if we even need to do a DB query.
$cache = \cache::make('core', 'message_time_last_message_between_users');
$key = helper::get_last_message_time_created_cache_key($otheruserid, $userid);
$lastcreated = $cache->get($key);
// The last known message time is earlier than the one being requested so we can
// just return an empty result set rather than having to query the DB.
if ($lastcreated && $lastcreated < $timefrom) {
return [];
}
}
$arrmessages = array();
if ($messages = helper::get_messages($userid, $otheruserid, 0, $limitfrom, $limitnum,
$sort, $timefrom, $timeto)) {
$arrmessages = helper::create_messages($userid, $messages);
}
return $arrmessages;
}
/**
* Returns the most recent message between two users.
*
* @param int $userid the current user
* @param int $otheruserid the other user
* @return \stdClass|null
*/
public static function get_most_recent_message($userid, $otheruserid) {
// We want two messages here so we get an accurate 'blocktime' value.
if ($messages = helper::get_messages($userid, $otheruserid, 0, 0, 2, 'timecreated DESC')) {
// Swap the order so we now have them in historical order.
$messages = array_reverse($messages);
$arrmessages = helper::create_messages($userid, $messages);
return array_pop($arrmessages);
}
return null;
}
/**
* Returns the profile information for a contact for a user.
*
* @param int $userid The user id
* @param int $otheruserid The id of the user whose profile we want to view.
* @return \stdClass
*/
public static function get_profile($userid, $otheruserid) {
global $CFG, $DB, $PAGE;
require_once($CFG->dirroot . '/user/lib.php');
$user = \core_user::get_user($otheruserid, '*', MUST_EXIST);
// Create the data we are going to pass to the renderable.
$data = new \stdClass();
$data->userid = $otheruserid;
$data->fullname = fullname($user);
$data->city = '';
$data->country = '';
$data->email = '';
$data->isonline = null;
// Get the user picture data - messaging has always shown these to the user.
$userpicture = new \user_picture($user);
$userpicture->size = 1; // Size f1.
$data->profileimageurl = $userpicture->get_url($PAGE)->out(false);
$userpicture->size = 0; // Size f2.
$data->profileimageurlsmall = $userpicture->get_url($PAGE)->out(false);
$userfields = user_get_user_details($user, null, array('city', 'country', 'email', 'lastaccess'));
if ($userfields) {
if (isset($userfields['city'])) {
$data->city = $userfields['city'];
}
if (isset($userfields['country'])) {
$data->country = $userfields['country'];
}
if (isset($userfields['email'])) {
$data->email = $userfields['email'];
}
if (isset($userfields['lastaccess'])) {
$data->isonline = helper::is_online($userfields['lastaccess']);
}
}
// Check if the contact has been blocked.
$contact = $DB->get_record('message_contacts', array('userid' => $userid, 'contactid' => $otheruserid));
if ($contact) {
$data->isblocked = (bool) $contact->blocked;
$data->iscontact = true;
} else {
$data->isblocked = false;
$data->iscontact = false;
}
return $data;
}
/**
* Checks if a user can delete messages they have either received or sent.
*
* @param int $userid The user id of who we want to delete the messages for (this may be done by the admin
* but will still seem as if it was by the user)
* @return bool Returns true if a user can delete the conversation, false otherwise.
*/
public static function can_delete_conversation($userid) {
global $USER;
$systemcontext = \context_system::instance();
// Let's check if the user is allowed to delete this conversation.
if (has_capability('moodle/site:deleteanymessage', $systemcontext) ||
((has_capability('moodle/site:deleteownmessage', $systemcontext) &&
$USER->id == $userid))) {
return true;
}
return false;
}
/**
* Deletes a conversation.
*
* This function does not verify any permissions.
*
* @param int $userid The user id of who we want to delete the messages for (this may be done by the admin
* but will still seem as if it was by the user)
* @param int $otheruserid The id of the other user in the conversation
* @return bool
*/
public static function delete_conversation($userid, $otheruserid) {
global $DB, $USER;
$conversationid = self::get_conversation_between_users([$userid, $otheruserid]);
// If there is no conversation, there is nothing to do.
if (!$conversationid) {
return true;
}
// Get all messages belonging to this conversation that have not already been deleted by this user.
$sql = "SELECT m.*
FROM {messages} m
INNER JOIN {message_conversations} mc
ON m.conversationid = mc.id
LEFT JOIN {message_user_actions} mua
ON (mua.messageid = m.id AND mua.userid = ? AND mua.action = ?)
WHERE mua.id is NULL
AND mc.id = ?
ORDER BY m.timecreated ASC";
$messages = $DB->get_records_sql($sql, [$userid, self::MESSAGE_ACTION_DELETED, $conversationid]);
// Ok, mark these as deleted.
foreach ($messages as $message) {
$mua = new \stdClass();
$mua->userid = $userid;
$mua->messageid = $message->id;
$mua->action = self::MESSAGE_ACTION_DELETED;
$mua->timecreated = time();
$mua->id = $DB->insert_record('message_user_actions', $mua);
if ($message->useridfrom == $userid) {
$useridto = $otheruserid;
} else {
$useridto = $userid;
}
\core\event\message_deleted::create_from_ids($message->useridfrom, $useridto,
$USER->id, $message->id, $mua->id)->trigger();
}
return true;
}
/**
* Returns the count of unread conversations (collection of messages from a single user) for
* the given user.
*
* @param \stdClass $user the user who's conversations should be counted
* @return int the count of the user's unread conversations
*/
public static function count_unread_conversations($user = null) {
global $USER, $DB;
if (empty($user)) {
$user = $USER;
}
$sql = "SELECT COUNT(DISTINCT(m.conversationid))
FROM {messages} m
INNER JOIN {message_conversations} mc
ON m.conversationid = mc.id
INNER JOIN {message_conversation_members} mcm
ON mc.id = mcm.conversationid
LEFT JOIN {message_user_actions} mua
ON (mua.messageid = m.id AND mua.userid = ? AND mua.action = ?)
WHERE mcm.userid = ?
AND mcm.userid != m.useridfrom
AND mua.id is NULL";
return $DB->count_records_sql($sql, [$user->id, self::MESSAGE_ACTION_READ, $user->id]);
}
/**
* Marks all messages being sent to a user in a particular conversation.
*
* If $conversationdid is null then it marks all messages as read sent to $userid.
*
* @param int $userid
* @param int|null $conversationid The conversation the messages belong to mark as read, if null mark all
*/
public static function mark_all_messages_as_read($userid, $conversationid = null) {
global $DB;
$messagesql = "SELECT m.*
FROM {messages} m
INNER JOIN {message_conversations} mc
ON mc.id = m.conversationid
INNER JOIN {message_conversation_members} mcm
ON mcm.conversationid = mc.id
LEFT JOIN {message_user_actions} mua
ON (mua.messageid = m.id AND mua.userid = ? AND mua.action = ?)
WHERE mua.id is NULL
AND mcm.userid = ?
AND m.useridfrom != ?";
$messageparams = [];
$messageparams[] = $userid;
$messageparams[] = self::MESSAGE_ACTION_READ;
$messageparams[] = $userid;
$messageparams[] = $userid;
if (!is_null($conversationid)) {
$messagesql .= " AND mc.id = ?";
$messageparams[] = $conversationid;
}
$messages = $DB->get_recordset_sql($messagesql, $messageparams);
foreach ($messages as $message) {
self::mark_message_as_read($userid, $message);
}
$messages->close();
}
/**
* Marks all notifications being sent from one user to another user as read.
*
* If the from user is null then it marks all notifications as read sent to the to user.
*
* @param int $touserid the id of the message recipient
* @param int|null $fromuserid the id of the message sender, null if all messages
* @return void
*/
public static function mark_all_notifications_as_read($touserid, $fromuserid = null) {
global $DB;
$notificationsql = "SELECT n.*
FROM {notifications} n
WHERE useridto = ?
AND timeread is NULL";
$notificationsparams = [$touserid];
if (!empty($fromuserid)) {
$notificationsql .= " AND useridfrom = ?";
$notificationsparams[] = $fromuserid;
}
$notifications = $DB->get_recordset_sql($notificationsql, $notificationsparams);
foreach ($notifications as $notification) {
self::mark_notification_as_read($notification);
}
$notifications->close();
}
/**
* Marks ALL messages being sent from $fromuserid to $touserid as read.
*
* Can be filtered by type.
*
* @deprecated since 3.5
* @param int $touserid the id of the message recipient
* @param int $fromuserid the id of the message sender
* @param string $type filter the messages by type, either MESSAGE_TYPE_NOTIFICATION, MESSAGE_TYPE_MESSAGE or '' for all.
* @return void
*/
public static function mark_all_read_for_user($touserid, $fromuserid = 0, $type = '') {
debugging('\core_message\api::mark_all_read_for_user is deprecated. Please either use ' .
'\core_message\api::mark_all_notifications_read_for_user or \core_message\api::mark_all_messages_read_for_user',
DEBUG_DEVELOPER);
$type = strtolower($type);
$conversationid = null;
$ignoremessages = false;
if (!empty($fromuserid)) {
$conversationid = self::get_conversation_between_users([$touserid, $fromuserid]);
if (!$conversationid) { // If there is no conversation between the users then there are no messages to mark.
$ignoremessages = true;
}
}
if (!empty($type)) {
if ($type == MESSAGE_TYPE_NOTIFICATION) {
self::mark_all_notifications_as_read($touserid, $fromuserid);
} else if ($type == MESSAGE_TYPE_MESSAGE) {
if (!$ignoremessages) {
self::mark_all_messages_as_read($touserid, $conversationid);
}
}
} else { // We want both.
self::mark_all_notifications_as_read($touserid, $fromuserid);
if (!$ignoremessages) {
self::mark_all_messages_as_read($touserid, $conversationid);
}
}
}
/**
* Returns message preferences.
*
* @param array $processors
* @param array $providers
* @param \stdClass $user
* @return \stdClass
* @since 3.2
*/
public static function get_all_message_preferences($processors, $providers, $user) {
$preferences = helper::get_providers_preferences($providers, $user->id);
$preferences->userdefaultemail = $user->email; // May be displayed by the email processor.
// For every processors put its options on the form (need to get function from processor's lib.php).
foreach ($processors as $processor) {
$processor->object->load_data($preferences, $user->id);
}
// Load general messaging preferences.
$preferences->blocknoncontacts = get_user_preferences('message_blocknoncontacts', '', $user->id);
$preferences->mailformat = $user->mailformat;
$preferences->mailcharset = get_user_preferences('mailcharset', '', $user->id);
return $preferences;
}
/**
* Count the number of users blocked by a user.
*
* @param \stdClass $user The user object
* @return int the number of blocked users
*/
public static function count_blocked_users($user = null) {
global $USER, $DB;
if (empty($user)) {
$user = $USER;
}
$sql = "SELECT count(mc.id)
FROM {message_contacts} mc
WHERE mc.userid = :userid AND mc.blocked = 1";
return $DB->count_records_sql($sql, array('userid' => $user->id));
}
/**
* Determines if a user is permitted to send another user a private message.
* If no sender is provided then it defaults to the logged in user.
*
* @param \stdClass $recipient The user object.
* @param \stdClass|null $sender The user object.
* @return bool true if user is permitted, false otherwise.
*/
public static function can_post_message($recipient, $sender = null) {
global $USER;
if (is_null($sender)) {
// The message is from the logged in user, unless otherwise specified.
$sender = $USER;
}
if (!has_capability('moodle/site:sendmessage', \context_system::instance(), $sender)) {
return false;
}
// The recipient blocks messages from non-contacts and the
// sender isn't a contact.
if (self::is_user_non_contact_blocked($recipient, $sender)) {
return false;
}
$senderid = null;
if ($sender !== null && isset($sender->id)) {
$senderid = $sender->id;
}
// The recipient has specifically blocked this sender.
if (self::is_user_blocked($recipient->id, $senderid)) {
return false;
}
return true;
}
/**
* Checks if the recipient is allowing messages from users that aren't a
* contact. If not then it checks to make sure the sender is in the
* recipient's contacts.
*
* @param \stdClass $recipient The user object.
* @param \stdClass|null $sender The user object.
* @return bool true if $sender is blocked, false otherwise.
*/
public static function is_user_non_contact_blocked($recipient, $sender = null) {
global $USER, $DB;
if (is_null($sender)) {
// The message is from the logged in user, unless otherwise specified.
$sender = $USER;
}
$blockednoncontacts = get_user_preferences('message_blocknoncontacts', '', $recipient->id);
if (!empty($blockednoncontacts)) {
// Confirm the sender is a contact of the recipient.
$exists = $DB->record_exists('message_contacts', array('userid' => $recipient->id, 'contactid' => $sender->id));
if ($exists) {
// All good, the recipient is a contact of the sender.
return false;
} else {
// Oh no, the recipient is not a contact. Looks like we can't send the message.
return true;
}
}
return false;
}
/**
* Checks if the recipient has specifically blocked the sending user.
*
* Note: This function will always return false if the sender has the
* readallmessages capability at the system context level.
*
* @param int $recipientid User ID of the recipient.
* @param int $senderid User ID of the sender.
* @return bool true if $sender is blocked, false otherwise.
*/
public static function is_user_blocked($recipientid, $senderid = null) {
global $USER, $DB;
if (is_null($senderid)) {
// The message is from the logged in user, unless otherwise specified.
$senderid = $USER->id;
}
$systemcontext = \context_system::instance();
if (has_capability('moodle/site:readallmessages', $systemcontext, $senderid)) {
return false;
}
if ($DB->get_field('message_contacts', 'blocked', ['userid' => $recipientid, 'contactid' => $senderid])) {
return true;
}
return false;
}
/**
* Get specified message processor, validate corresponding plugin existence and
* system configuration.
*
* @param string $name Name of the processor.
* @param bool $ready only return ready-to-use processors.
* @return mixed $processor if processor present else empty array.
* @since Moodle 3.2
*/
public static function get_message_processor($name, $ready = false) {
global $DB, $CFG;
$processor = $DB->get_record('message_processors', array('name' => $name));
if (empty($processor)) {
// Processor not found, return.
return array();
}
$processor = self::get_processed_processor_object($processor);
if ($ready) {
if ($processor->enabled && $processor->configured) {
return $processor;
} else {
return array();
}
} else {
return $processor;
}
}
/**
* Returns weather a given processor is enabled or not.
* Note:- This doesn't check if the processor is configured or not.
*
* @param string $name Name of the processor
* @return bool
*/
public static function is_processor_enabled($name) {
$cache = \cache::make('core', 'message_processors_enabled');
$status = $cache->get($name);
if ($status === false) {
$processor = self::get_message_processor($name);
if (!empty($processor)) {
$cache->set($name, $processor->enabled);
return $processor->enabled;
} else {
return false;
}
}
return $status;
}
/**
* Set status of a processor.
*
* @param \stdClass $processor processor record.
* @param 0|1 $enabled 0 or 1 to set the processor status.
* @return bool
* @since Moodle 3.2
*/
public static function update_processor_status($processor, $enabled) {
global $DB;
$cache = \cache::make('core', 'message_processors_enabled');
$cache->delete($processor->name);
return $DB->set_field('message_processors', 'enabled', $enabled, array('id' => $processor->id));
}
/**
* Given a processor object, loads information about it's settings and configurations.
* This is not a public api, instead use @see \core_message\api::get_message_processor()
* or @see \get_message_processors()
*
* @param \stdClass $processor processor object
* @return \stdClass processed processor object
* @since Moodle 3.2
*/
public static function get_processed_processor_object(\stdClass $processor) {
global $CFG;
$processorfile = $CFG->dirroot. '/message/output/'.$processor->name.'/message_output_'.$processor->name.'.php';
if (is_readable($processorfile)) {
include_once($processorfile);
$processclass = 'message_output_' . $processor->name;
if (class_exists($processclass)) {
$pclass = new $processclass();
$processor->object = $pclass;
$processor->configured = 0;
if ($pclass->is_system_configured()) {
$processor->configured = 1;
}
$processor->hassettings = 0;
if (is_readable($CFG->dirroot.'/message/output/'.$processor->name.'/settings.php')) {
$processor->hassettings = 1;
}
$processor->available = 1;
} else {
print_error('errorcallingprocessor', 'message');
}
} else {
$processor->available = 0;
}
return $processor;
}
/**
* Retrieve users blocked by $user1
*
* @param int $userid The user id of the user whos blocked users we are returning
* @return array the users blocked
*/
public static function get_blocked_users($userid) {
global $DB;
$userfields = \user_picture::fields('u', array('lastaccess'));
$blockeduserssql = "SELECT $userfields
FROM {message_contacts} mc
INNER JOIN {user} u
ON u.id = mc.contactid
WHERE u.deleted = 0
AND mc.userid = ?
AND mc.blocked = 1
GROUP BY $userfields
ORDER BY u.firstname ASC";
return $DB->get_records_sql($blockeduserssql, [$userid]);
}
/**
* Mark a single message as read.
*
* @param int $userid The user id who marked the message as read
* @param \stdClass $message The message
* @param int|null $timeread The time the message was marked as read, if null will default to time()
*/
public static function mark_message_as_read($userid, $message, $timeread = null) {
global $DB;
if (is_null($timeread)) {
$timeread = time();
}
$mua = new \stdClass();
$mua->userid = $userid;
$mua->messageid = $message->id;
$mua->action = self::MESSAGE_ACTION_READ;
$mua->timecreated = $timeread;
$mua->id = $DB->insert_record('message_user_actions', $mua);
// Get the context for the user who received the message.
$context = \context_user::instance($userid, IGNORE_MISSING);
// If the user no longer exists the context value will be false, in this case use the system context.
if ($context === false) {
$context = \context_system::instance();
}
// Trigger event for reading a message.
$event = \core\event\message_viewed::create(array(
'objectid' => $mua->id,
'userid' => $userid, // Using the user who read the message as they are the ones performing the action.
'context' => $context,
'relateduserid' => $message->useridfrom,
'other' => array(
'messageid' => $message->id
)
));
$event->trigger();
}
/**
* Mark a single notification as read.
*
* @param \stdClass $notification The notification
* @param int|null $timeread The time the message was marked as read, if null will default to time()
*/
public static function mark_notification_as_read($notification, $timeread = null) {
global $DB;
if (is_null($timeread)) {
$timeread = time();
}
if (is_null($notification->timeread)) {
$updatenotification = new \stdClass();
$updatenotification->id = $notification->id;
$updatenotification->timeread = $timeread;
$DB->update_record('notifications', $updatenotification);
// Trigger event for reading a notification.
\core\event\notification_viewed::create_from_ids(
$notification->useridfrom,
$notification->useridto,
$notification->id
)->trigger();
}
}
/**
* Checks if a user can delete a message.
*
* @param int $userid the user id of who we want to delete the message for (this may be done by the admin
* but will still seem as if it was by the user)
* @param int $messageid The message id
* @return bool Returns true if a user can delete the message, false otherwise.
*/
public static function can_delete_message($userid, $messageid) {
global $DB, $USER;
$sql = "SELECT m.id, m.useridfrom, mcm.userid as useridto
FROM {messages} m
INNER JOIN {message_conversations} mc
ON m.conversationid = mc.id
INNER JOIN {message_conversation_members} mcm
ON mcm.conversationid = mc.id
WHERE mcm.userid != m.useridfrom
AND m.id = ?";
$message = $DB->get_record_sql($sql, [$messageid], MUST_EXIST);
if ($message->useridfrom == $userid) {
$userdeleting = 'useridfrom';
} else if ($message->useridto == $userid) {
$userdeleting = 'useridto';
} else {
return false;
}
$systemcontext = \context_system::instance();
// Let's check if the user is allowed to delete this message.
if (has_capability('moodle/site:deleteanymessage', $systemcontext) ||
((has_capability('moodle/site:deleteownmessage', $systemcontext) &&
$USER->id == $message->$userdeleting))) {
return true;
}
return false;
}
/**
* Deletes a message.
*
* This function does not verify any permissions.
*
* @param int $userid the user id of who we want to delete the message for (this may be done by the admin
* but will still seem as if it was by the user)
* @param int $messageid The message id
* @return bool
*/
public static function delete_message($userid, $messageid) {
global $DB;
$sql = "SELECT m.id, m.useridfrom, mcm.userid as useridto
FROM {messages} m
INNER JOIN {message_conversations} mc
ON m.conversationid = mc.id
INNER JOIN {message_conversation_members} mcm
ON mcm.conversationid = mc.id
WHERE mcm.userid != m.useridfrom
AND m.id = ?";
$message = $DB->get_record_sql($sql, [$messageid], MUST_EXIST);
// Check if the user has already deleted this message.
if (!$DB->record_exists('message_user_actions', ['userid' => $userid,
'messageid' => $messageid, 'action' => self::MESSAGE_ACTION_DELETED])) {
$mua = new \stdClass();
$mua->userid = $userid;
$mua->messageid = $messageid;
$mua->action = self::MESSAGE_ACTION_DELETED;
$mua->timecreated = time();
$mua->id = $DB->insert_record('message_user_actions', $mua);
// Trigger event for deleting a message.
\core\event\message_deleted::create_from_ids($message->useridfrom, $message->useridto,
$userid, $message->id, $mua->id)->trigger();
return true;
}
return false;
}
/**
* Returns the conversation between two users.
*
* @param array $userids
* @return int|bool The id of the conversation, false if not found
*/
public static function get_conversation_between_users(array $userids) {
global $DB;
$hash = helper::get_conversation_hash($userids);
if ($conversation = $DB->get_record('message_conversations', ['convhash' => $hash])) {
return $conversation->id;
}
return false;
}
/**
* Creates a conversation between two users.
*
* @param array $userids
* @return int The id of the conversation
*/
public static function create_conversation_between_users(array $userids) {
global $DB;
$conversation = new \stdClass();
$conversation->convhash = helper::get_conversation_hash($userids);
$conversation->timecreated = time();
$conversation->id = $DB->insert_record('message_conversations', $conversation);
// Add members to this conversation.
foreach ($userids as $userid) {
$member = new \stdClass();
$member->conversationid = $conversation->id;
$member->userid = $userid;
$member->timecreated = time();
$DB->insert_record('message_conversation_members', $member);
}
return $conversation->id;
}
}
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