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lib.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/>.
/**
* Library functions for messaging
*
* @copyright Luis Rodrigues
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @package message
*/
require_once($CFG->libdir.'/eventslib.php');
define ('MESSAGE_SHORTLENGTH', 300);
define ('MESSAGE_WINDOW', true); // We are in a message window (so don't pop up a new one!)
if (!isset($CFG->message_contacts_refresh)) { // Refresh the contacts list every 60 seconds
$CFG->message_contacts_refresh = 60;
}
if (!isset($CFG->message_chat_refresh)) { // Look for new comments every 5 seconds
$CFG->message_chat_refresh = 5;
}
if (!isset($CFG->message_offline_time)) {
$CFG->message_offline_time = 300;
}
function message_print_contacts() {
global $USER, $CFG, $DB, $PAGE, $OUTPUT;
$timetoshowusers = 300; //Seconds default
if (isset($CFG->block_online_users_timetosee)) {
$timetoshowusers = $CFG->block_online_users_timetosee * 60;
}
// time which a user is counting as being active since
$timefrom = time()-$timetoshowusers;
// people in our contactlist who are online
$onlinecontacts = array();
// people in our contactlist who are offline
$offlinecontacts = array();
// people who are not in our contactlist but have sent us a message
$strangers = array();
// get all in our contactlist who are not blocked in our contact list
// and count messages we have waiting from each of them
$contactsql = "SELECT u.id, u.firstname, u.lastname, u.picture,
u.imagealt, u.lastaccess, count(m.id) as messagecount
FROM {message_contacts} mc
JOIN {user} u ON u.id = mc.contactid
LEFT OUTER JOIN {message} m ON m.useridfrom = mc.contactid AND m.useridto = ?
WHERE mc.userid = ? AND mc.blocked = 0
GROUP BY u.id, u.firstname, u.lastname, u.picture,
u.imagealt, u.lastaccess
ORDER BY u.firstname ASC";
if ($rs = $DB->get_recordset_sql($contactsql, array($USER->id, $USER->id))){
foreach($rs as $rd){
if($rd->lastaccess >= $timefrom){
// they have been active recently, so are counted online
$onlinecontacts[] = $rd;
}else{
$offlinecontacts[] = $rd;
}
}
unset($rd);
$rs->close();
}
// get messages from anyone who isn't in our contact list and count the number
// of messages we have from each of them
$strangersql = "SELECT u.id, u.firstname, u.lastname, u.picture,
u.imagealt, u.lastaccess, count(m.id) as messagecount
FROM {message} m
JOIN {user} u ON u.id = m.useridfrom
LEFT OUTER JOIN {message_contacts} mc ON mc.contactid = m.useridfrom AND mc.userid = m.useridto
WHERE mc.id IS NULL AND m.useridto = ?
GROUP BY u.id, u.firstname, u.lastname, u.picture,
u.imagealt, u.lastaccess
ORDER BY u.firstname ASC";
if($rs = $DB->get_recordset_sql($strangersql, array($USER->id))){
foreach($rs as $rd){
$strangers[] = $rd;
}
unset($rd);
$rs->close();
}
$countonlinecontacts = count($onlinecontacts);
$countofflinecontacts = count($offlinecontacts);
$countstrangers = count($strangers);
if ($countonlinecontacts + $countofflinecontacts == 0) {
echo '<div class="heading">';
print_string('contactlistempty', 'message');
echo '</div>';
echo '<div class="note">';
print_string('addsomecontacts', 'message', $CFG->wwwroot.'/message/index.php?tab=search');
echo '</div>';
}
echo '<table id="message_contacts" class="boxaligncenter" cellspacing="2" cellpadding="0" border="0">';
if($countonlinecontacts) {
/// print out list of online contacts
echo '<tr><td colspan="3" class="heading">';
echo get_string('onlinecontacts', 'message', $countonlinecontacts);
echo '</td></tr>';
foreach ($onlinecontacts as $contact) {
message_print_contactlist_user($contact);
}
}
echo '<tr><td colspan="3"> </td></tr>';
if ($countofflinecontacts) {
/// print out list of offline contacts
echo '<tr><td colspan="3" class="heading">';
echo get_string('offlinecontacts', 'message', $countofflinecontacts);
echo '</td></tr>';
foreach ($offlinecontacts as $contact) {
message_print_contactlist_user($contact);
}
echo '<tr><td colspan="3"> </td></tr>';
}
/// print out list of incoming contacts
if ($countstrangers) {
echo '<tr><td colspan="3" class="heading">';
echo get_string('incomingcontacts', 'message', $countstrangers);
echo '</td></tr>';
foreach ($strangers as $stranger) {
message_print_contactlist_user($stranger, false);
}
}
echo '</table>';
if ($countstrangers && ($countonlinecontacts + $countofflinecontacts == 0)) { // Extra help
echo '<div class="note">(';
print_string('addsomecontactsincoming', 'message');
echo ')</div>';
}
echo '<br />';
$autorefresh = '<p align="center" class="note">'.get_string('pagerefreshes', 'message', $CFG->message_contacts_refresh).'</p>';
$autorefresh = addslashes_js($autorefresh); // js escaping
$PAGE->requires->js('message/message.js');
$PAGE->requires->js_function_call('refresh_page', Array(60*1000, $PAGE->url->out()));
echo $OUTPUT->container_start('messagejsautorefresh note center');
echo get_string('pagerefreshes', 'message', $CFG->message_contacts_refresh);
echo $OUTPUT->container_end();
echo $OUTPUT->container_start('messagejsmanualrefresh aligncenter');
echo $OUTPUT->button(html_form::make_button('index.php', false, get_string('refresh')));
echo $OUTPUT->container_end();
}
/// $messagearray is an array of objects
/// $field is a valid property of object
/// $value is the value $field should equal to be counted
/// if $field is empty then return count of the whole array
/// if $field is non-existent then return 0;
function message_count_messages($messagearray, $field='', $value='') {
if (!is_array($messagearray)) return 0;
if ($field == '' or empty($messagearray)) return count($messagearray);
$count = 0;
foreach ($messagearray as $message) {
$count += ($message->$field == $value) ? 1 : 0;
}
return $count;
}
function message_print_search() {
global $USER, $OUTPUT;
if ($frm = data_submitted()) {
message_print_search_results($frm);
} else {
/*
/// unfinished buggy code disabled in search.html anyway
// find all courses this use has readallmessages capabilities in
if ($teachers = get_user_capability_course('moodle/site:readallmessages')) {
$courses = get_courses('all', 'c.sortorder ASC', 'c.id, c.shortname');
$cs = '<select name="courseselect">';
foreach ($teachers as $tcourse) {
$cs .= "<option value=\"$tcourse->course\">".$courses[$tcourse->id]->shortname."</option>\n";
}
$cs .= '</select>';
}
*/
include('search.html');
}
}
function message_print_settings() {
global $USER, $OUTPUT;
if ($frm = data_submitted() and confirm_sesskey()) {
$pref = array();
$pref['message_showmessagewindow'] = (isset($frm->showmessagewindow)) ? '1' : '0';
$pref['message_beepnewmessage'] = (isset($frm->beepnewmessage)) ? '1' : '0';
$pref['message_blocknoncontacts'] = (isset($frm->blocknoncontacts)) ? '1' : '0';
$pref['message_usehtmleditor'] = (isset($frm->usehtmleditor)) ? '1' : '0';
$pref['message_noframesjs'] = (isset($frm->noframesjs)) ? '1' : '0';
$pref['message_emailmessages'] = (isset($frm->emailmessages)) ? '1' : '0';
$pref['message_emailtimenosee'] = ((int)$frm->emailtimenosee > 0) ? (int)$frm->emailtimenosee : '10';
$pref['message_emailaddress'] = (!empty($frm->emailaddress)) ? $frm->emailaddress : $USER->email;
$pref['message_emailformat'] = (isset($frm->emailformat)) ? $frm->emailformat : FORMAT_PLAIN;
set_user_preferences($pref);
redirect('index.php', get_string('settingssaved', 'message'), 1);
}
$cbshowmessagewindow = (get_user_preferences('message_showmessagewindow', 1) == '1') ? 'checked="checked"' : '';
$cbbeepnewmessage = (get_user_preferences('message_beepnewmessage', 0) == '1') ? 'checked="checked"' : '';
$cbblocknoncontacts = (get_user_preferences('message_blocknoncontacts', 0) == '1') ? 'checked="checked"' : '';
$cbusehtmleditor = (get_user_preferences('message_usehtmleditor', 0) == '1') ? 'checked="checked"' : '';
$cbnoframesjs = (get_user_preferences('message_noframesjs', 0) == '1') ? 'checked="checked"' : '';
$cbemailmessages = (get_user_preferences('message_emailmessages', 1) == '1') ? 'checked="checked"' : '';
$txemailaddress = get_user_preferences('message_emailaddress', $USER->email);
$txemailtimenosee = get_user_preferences('message_emailtimenosee', 10);
$format_select = $OUTPUT->select(html_select::make( array(FORMAT_PLAIN => get_string('formatplain'),
FORMAT_HTML => get_string('formathtml')),
'emailformat',
get_user_preferences('message_emailformat', FORMAT_PLAIN)));
include('settings.html');
}
function message_add_contact($contactid, $blocked=0) {
global $USER, $DB;
if (!$DB->record_exists('user', array('id'=>$contactid))) { // invalid userid
return false;
}
if (($contact = $DB->get_record('message_contacts', array('userid'=>$USER->id, 'contactid'=>$contactid))) !== false) {
/// record already exists - we may be changing blocking status
if ($contact->blocked !== $blocked) {
/// change to blocking status
$contact->blocked = $blocked;
return $DB->update_record('message_contacts', $contact);
} else {
/// no changes to blocking status
return true;
}
} else {
/// new contact record
unset($contact);
$contact->userid = $USER->id;
$contact->contactid = $contactid;
$contact->blocked = $blocked;
return $DB->insert_record('message_contacts', $contact, false);
}
}
function message_remove_contact($contactid) {
global $USER, $DB;
return $DB->delete_records('message_contacts', array('userid'=>$USER->id, 'contactid'=>$contactid));
}
function message_unblock_contact($contactid) {
global $USER, $DB;
return $DB->delete_records('message_contacts', array('userid'=>$USER->id, 'contactid'=>$contactid));
}
function message_block_contact($contactid) {
return message_add_contact($contactid, 1);
}
function message_get_contact($contactid) {
global $USER, $DB;
return $DB->get_record('message_contacts', array('userid'=>$USER->id, 'contactid'=>$contactid));
}
function message_print_search_results($frm) {
global $USER, $CFG, $DB, $OUTPUT;
echo '<div class="mdl-align">';
/// search for person
if (!empty($frm->personsubmit) and !empty($frm->name)) {
if (optional_param('mycourses', 0, PARAM_BOOL)) {
$users = array();
$mycourses = get_my_courses($USER->id);
foreach ($mycourses as $mycourse) {
if (is_array($susers = message_search_users($mycourse->id, $frm->name))) {
foreach ($susers as $suser) $users[$suser->id] = $suser;
}
}
} else {
$users = message_search_users(SITEID, $frm->name);
}
if (!empty($users)) {
echo '<strong>'.get_string('userssearchresults', 'message', count($users)).'</strong>';
echo '<table class="message_users">';
foreach ($users as $user) {
if ( $user->contactlistid ) {
if ($user->blocked == 0) { /// not blocked
$strcontact = message_contact_link($user->id, 'remove', true);
$strblock = message_contact_link($user->id, 'block', true);
} else { // blocked
$strcontact = message_contact_link($user->id, 'add', true);
$strblock = message_contact_link($user->id, 'unblock', true);
}
} else {
$strcontact = message_contact_link($user->id, 'add', true);
$strblock = message_contact_link($user->id, 'block', true);
}
$strhistory = message_history_link($user->id, 0, true, '', '', 'icon');
echo '<tr><td class="pix">';
$userpic = moodle_user_picture::make($user, SITEID);
$userpic->size = 20;
$userpic->link = true;
echo $OUTPUT->user_picture($userpic);
echo '</td>';
echo '<td class="contact">';
$popupoptions = array(
'height' => 500,
'width' => 500,
'menubar' => false,
'location' => false,
'status' => true,
'scrollbars' => true,
'resizable' => true);
$link = html_link::make("/message/discussion.php?id=$user->id", fullname($user));
$link->add_action(new popup_action('click', $link->url, "message_$user->id", $popupoptions));
$link->title = get_string('sendmessageto', 'message', fullname($user));
echo $OUTPUT->link($link);
echo '</td>';
echo '<td class="link">'.$strcontact.'</td>';
echo '<td class="link">'.$strblock.'</td>';
echo '<td class="link">'.$strhistory.'</td>';
echo '</tr>';
}
echo '</table>';
} else {
echo $OUTPUT->notification(get_string('nosearchresults', 'message'));
}
/// search messages for keywords
} else if (!empty($frm->keywordssubmit)) {
$keywordstring = clean_text(trim($frm->keywords));
if ($keywordstring) {
$keywords = explode(' ', $keywordstring);
} else {
$keywords = array();
}
$tome = false;
$fromme = false;
$courseid = 'none';
switch ($frm->keywordsoption) {
case 'tome':
$tome = true;
break;
case 'fromme':
$fromme = true;
break;
case 'allmine':
$tome = true;
$fromme = true;
break;
case 'allusers':
$courseid = SITEID;
break;
case 'courseusers':
$courseid = $frm->courseid;
break;
default:
$tome = true;
$fromme = true;
}
if (($messages = message_search($keywords, $fromme, $tome, $courseid)) !== false) {
/// get a list of contacts
if (($contacts = $DB->get_records('message_contacts', array('userid'=>$USER->id), '', 'contactid, blocked') ) === false) {
$contacts = array();
}
/// print heading with number of results
echo '<p class="heading">'.get_string('keywordssearchresults', 'message', count($messages)).' ("'.s($keywordstring).'")</p>';
/// print table headings
echo '<table class="searchresults" cellspacing="0">';
echo '<tr>';
echo '<td><strong>'.get_string('from').'</strong></td>';
echo '<td><strong>'.get_string('to').'</strong></td>';
echo '<td><strong>'.get_string('message', 'message').'</strong></td>';
echo '<td><strong>'.get_string('timesent', 'message').'</strong></td>';
echo "</tr>\n";
$blockedcount = 0;
$dateformat = get_string('strftimedatetimeshort');
$strcontext = get_string('context', 'message');
foreach ($messages as $message) {
/// ignore messages to and from blocked users unless $frm->includeblocked is set
if (!optional_param('includeblocked', 0, PARAM_BOOL) and (
( isset($contacts[$message->useridfrom]) and ($contacts[$message->useridfrom]->blocked == 1)) or
( isset($contacts[$message->useridto] ) and ($contacts[$message->useridto]->blocked == 1))
)
) {
$blockedcount ++;
continue;
}
/// load up user to record
if ($message->useridto !== $USER->id) {
$userto = $DB->get_record('user', array('id'=>$message->useridto));
$tocontact = (array_key_exists($message->useridto, $contacts) and
($contacts[$message->useridto]->blocked == 0) );
$toblocked = (array_key_exists($message->useridto, $contacts) and
($contacts[$message->useridto]->blocked == 1) );
} else {
$userto = false;
$tocontact = false;
$toblocked = false;
}
/// load up user from record
if ($message->useridfrom !== $USER->id) {
$userfrom = $DB->get_record('user', array('id'=>$message->useridfrom));
$fromcontact = (array_key_exists($message->useridfrom, $contacts) and
($contacts[$message->useridfrom]->blocked == 0) );
$fromblocked = (array_key_exists($message->useridfrom, $contacts) and
($contacts[$message->useridfrom]->blocked == 1) );
} else {
$userfrom = false;
$fromcontact = false;
$fromblocked = false;
}
/// find date string for this message
$date = usergetdate($message->timecreated);
$datestring = $date['year'].$date['mon'].$date['mday'];
/// print out message row
echo '<tr valign="top">';
echo '<td class="contact">';
message_print_user($userfrom, $fromcontact, $fromblocked);
echo '</td>';
echo '<td class="contact">';
message_print_user($userto, $tocontact, $toblocked);
echo '</td>';
echo '<td class="summary">'.message_get_fragment($message->fullmessage, $keywords);
echo '<br /><div class="link">';
message_history_link($message->useridto, $message->useridfrom, false,
$keywordstring, 'm'.$message->id, $strcontext);
echo '</div>';
echo '</td>';
echo '<td class="date">'.userdate($message->timecreated, $dateformat).'</td>';
echo "</tr>\n";
}
if ($blockedcount > 0) {
echo '<tr><td colspan="4" align="center">'.get_string('blockedmessages', 'message', $blockedcount).'</td></tr>';
}
echo '</table>';
} else {
echo $OUTPUT->notification(get_string('nosearchresults', 'message'));
}
/// what the ????, probably an empty search string, duh!
} else {
echo $OUTPUT->notification(get_string('emptysearchstring', 'message'));
}
echo '<br />';
echo $OUTPUT->button(html_form::make_button('index.php', array( 'tab' => 'search'), get_string('newsearch', 'message')));
echo '</div>';
}
function message_print_user ($user=false, $iscontact=false, $isblocked=false) {
global $USER, $OUTPUT;
$userpic = moodle_user_picture::make($USER, SITEID);
$userpic->size = 20;
$userpic->link = true;
if ($user === false) {
echo $OUTPUT->user_picture($userpic);
} else {
echo $OUTPUT->user_picture($userpic);
echo ' ';
if ($iscontact) {
message_contact_link($user->id, 'remove');
} else {
message_contact_link($user->id, 'add');
}
echo ' ';
if ($isblocked) {
message_contact_link($user->id, 'unblock');
} else {
message_contact_link($user->id, 'block');
}
echo '<br />';
$popupoptions = array(
'height' => 500,
'width' => 500,
'menubar' => false,
'location' => false,
'status' => true,
'scrollbars' => true,
'resizable' => true);
$link = html_link::make("/message/discussion.php?id=$user->id", fullname($user));
$link->add_action(new popup_action('click', $link->url, "message_$user->id", $popupoptions));
$link->title = get_string('sendmessageto', 'message', fullname($user));
echo $OUTPUT->link($link);
}
}
/// linktype can be: add, remove, block, unblock
function message_contact_link($userid, $linktype='add', $return=false, $script="index.php?tab=contacts", $text=false) {
global $USER, $CFG, $OUTPUT;
static $str;
if (empty($str->blockcontact)) {
$str->blockcontact = get_string('blockcontact', 'message');
$str->unblockcontact = get_string('unblockcontact', 'message');
$str->removecontact = get_string('removecontact', 'message');
$str->addcontact = get_string('addcontact', 'message');
}
$command = $linktype.'contact';
$string = $str->{$command};
$alttext = $text ? '' : $string;
$text = $text ? ' '.$string : '';
switch ($linktype) {
case 'block':
$icon = 't/go';
break;
case 'unblock':
$icon = 't/stop';
break;
case 'remove':
$icon = 't/user';
break;
case 'add':
default:
$icon = 't/usernot';
}
$output = '<span class="'.$linktype.'">'.
'<a href="'.$script.'&'.$command.'='.$userid.
'&sesskey='.sesskey().'" title="'.s($string).'">'.
'<img src="'.$OUTPUT->old_icon_url($icon).'" class="iconsmall" alt="'.s($alttext).'" />'.
$text.'</a></span>';
if ($return) {
return $output;
} else {
echo $output;
return true;
}
}
function message_history_link($userid1, $userid2=0, $returnstr=false, $keywords='', $position='', $linktext='') {
global $USER, $CFG, $OUTPUT;
static $strmessagehistory;
if (empty($strmessagehistory)) {
$strmessagehistory = get_string('messagehistory', 'message');
}
if (!$userid2) {
$userid2 = $USER->id;
}
if ($position) {
$position = "#$position";
}
if ($keywords) {
$keywords = "&search=".urlencode($keywords);
}
if ($linktext == 'icon') { // Icon only
$fulllink = '<img src="'.$OUTPUT->old_icon_url('t/log') . '" class="iconsmall" alt="'.$strmessagehistory.'" />';
} else if ($linktext == 'both') { // Icon and standard name
$fulllink = '<img src="'.$OUTPUT->old_icon_url('t/log') . '" class="iconsmall" alt="" />';
$fulllink .= ' '.$strmessagehistory;
} else if ($linktext) { // Custom name
$fulllink = $linktext;
} else { // Standard name only
$fulllink = $strmessagehistory;
}
$popupoptions = array(
'height' => 500,
'width' => 500,
'menubar' => false,
'location' => false,
'status' => true,
'scrollbars' => true,
'resizable' => true);
$link = html_link::make("/message/history.php?user1=$userid1&user2=$userid2$keywords$position", $fulllink);
$link->add_action(new popup_action('click', $link->url, "message_history_$userid1", $popupoptions));
$link->title = $strmessagehistory;
$str = $OUTPUT->link($link);
$str = '<span class="history">'.$str.'</span>';
if ($returnstr) {
return $str;
} else {
echo $str;
return true;
}
}
/**
* Search through course users
*
* If $coursid specifies the site course then this function searches
* through all undeleted and confirmed users
*
* @uses $CFG, $USER
* @uses SITEID
* @param int $courseid The course in question.
* @param string $searchtext ?
* @param string $sort ?
* @param string $exceptions ?
* @return array An array of {@link $USER} records.
* @todo Finish documenting this function
*/
function message_search_users($courseid, $searchtext, $sort='', $exceptions='') {
global $CFG, $USER, $DB;
$fullname = $DB->sql_fullname();
$LIKE = $DB->sql_ilike();
if (!empty($exceptions)) {
$except = ' AND u.id NOT IN ('. $exceptions .') ';
} else {
$except = '';
}
if (!empty($sort)) {
$order = ' ORDER BY '. $sort;
} else {
$order = '';
}
$select = 'u.deleted = \'0\' AND u.confirmed = \'1\'';
$fields = 'u.id, u.firstname, u.lastname, u.picture, u.imagealt, mc.id as contactlistid, mc.blocked';
if (!$courseid or $courseid == SITEID) {
$params = array($USER->id, "%$searchtext%");
return $DB->get_records_sql("SELECT $fields
FROM {user} u
LEFT JOIN {message_contacts} mc
ON mc.contactid = u.id AND mc.userid = ?
WHERE $select
AND ($fullname $LIKE ?)
$except
$order", $params);
} else {
$context = get_context_instance(CONTEXT_COURSE, $courseid);
$contextlists = get_related_contexts_string($context);
// everyone who has a role assignement in this course or higher
$params = array($USER->id, "%$searchtext%");
$users = $DB->get_records_sql("SELECT $fields
FROM {user} u
JOIN {role_assignments} ra ON ra.userid = u.id
LEFT JOIN {message_contacts} mc
ON mc.contactid = u.id AND mc.userid = ?
WHERE $select
AND ra.contextid $contextlists
AND ($fullname $LIKE ?)
$except
$order", $params);
return $users;
}
}
function message_search($searchterms, $fromme=true, $tome=true, $courseid='none', $userid=0) {
/// Returns a list of posts found using an array of search terms
/// eg word +word -word
///
global $CFG, $USER, $DB;
/// If no userid sent then assume current user
if ($userid == 0) $userid = $USER->id;
/// Some differences in SQL syntax
if ($DB->sql_regex_supported()) {
$REGEXP = $DB->sql_regex(true);
$NOTREGEXP = $DB->sql_regex(false);
}
$LIKE = $DB->sql_ilike();
$searchcond = array();
$params = array();
$i = 0;
foreach ($searchterms as $searchterm) {
$i++;
$NOT = ''; /// Initially we aren't going to perform NOT LIKE searches, only MSSQL and Oracle
if (strlen($searchterm) < 2) {
continue;
}
/// Under Oracle and MSSQL, trim the + and - operators and perform
/// simpler LIKE search
if (!$DB->sql_regex_supported()) {
if (substr($searchterm, 0, 1) == '-') {
$NOT = ' NOT ';
}
$searchterm = trim($searchterm, '+-');
}
if (substr($searchterm,0,1) == "+") {
$searchterm = substr($searchterm,1);
$searchterm = preg_quote($searchterm, '|');
$searchcond[] = "m.fullmessage $REGEXP :ss$i";
$params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
} else if (substr($searchterm,0,1) == "-") {
$searchterm = substr($searchterm,1);
$searchterm = preg_quote($searchterm, '|');
$searchcond[] = "m.fullmessage $NOTREGEXP :ss$i";
$params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
} else {
$searchcond[] = "m.fullmessage $NOT $LIKE :ss$i";
$params['ss'.$i] = "%$searchterm%";
}
}
if (empty($searchcond)) {
$searchcond = " m.fullmessage $LIKE :ss1";
$params['ss1'] = "%";
} else {
$searchcond = implode(" AND ", $searchcond);
}
/// There are several possibilities
/// 1. courseid = SITEID : The admin is searching messages by all users
/// 2. courseid = ?? : A teacher is searching messages by users in
/// one of their courses - currently disabled
/// 3. courseid = none : User is searching their own messages;
/// a. Messages from user
/// b. Messages to user
/// c. Messages to and from user
if ($courseid == SITEID) { /// admin is searching all messages
$m_read = $DB->get_records_sql("SELECT m.id, m.useridto, m.useridfrom, m.fullmessage, m.timecreated
FROM {message_read} m
WHERE $searchcond", $params);
$m_unread = $DB->get_records_sql("SELECT m.id, m.useridto, m.useridfrom, m.fullmessage, m.timecreated
FROM {message} m
WHERE $searchcond", $params);
} else if ($courseid !== 'none') {
/// This has not been implemented due to security concerns
$m_read = array();
$m_unread = array();
} else {
if ($fromme and $tome) {
$searchcond .= " AND (m.useridfrom=:userid1 OR m.useridto=:userid2)";
$params['userid1'] = $userid;
$params['userid2'] = $userid;
} else if ($fromme) {
$searchcond .= " AND m.useridfrom=:userid";
$params['userid'] = $userid;
} else if ($tome) {
$searchcond .= " AND m.useridto=:userid";
$params['userid'] = $userid;
}
$m_read = $DB->get_records_sql("SELECT m.id, m.useridto, m.useridfrom, m.fullmessage, m.timecreated
FROM {message_read} m
WHERE $searchcond", $params);
$m_unread = $DB->get_records_sql("SELECT m.id, m.useridto, m.useridfrom, m.fullmessage, m.timecreated
FROM {message} m
WHERE $searchcond", $params);
}
/// The keys may be duplicated in $m_read and $m_unread so we can't
/// do a simple concatenation
$message = array();
foreach ($m_read as $m) {
$messages[] = $m;
}
foreach ($m_unread as $m) {
$messages[] = $m;
}
return (empty($messages)) ? false : $messages;
}
/// Borrowed with changes from mod/forum/lib.php
function message_shorten_message($message, $minlength=0) {
// Given a post object that we already know has a long message
// this function truncates the message nicely to the first
// sane place between $CFG->forum_longpost and $CFG->forum_shortpost
$i = 0;
$tag = false;
$length = strlen($message);
$count = 0;
$stopzone = false;
$truncate = 0;
if ($minlength == 0) $minlength = MESSAGE_SHORTLENGTH;
for ($i=0; $i<$length; $i++) {
$char = $message[$i];
switch ($char) {
case "<":
$tag = true;
break;
case ">":
$tag = false;
break;
default:
if (!$tag) {
if ($stopzone) {
if ($char == '.' or $char == ' ') {
$truncate = $i+1;
break 2;
}
}
$count++;
}
break;
}
if (!$stopzone) {
if ($count > $minlength) {
$stopzone = true;
}
}
}
if (!$truncate) {
$truncate = $i;
}
return substr($message, 0, $truncate);
}
/**
* Given a string and an array of keywords, this function looks
* for the first keyword in the string, and then chops out a
* small section from the text that shows that word in context.
*/
function message_get_fragment($message, $keywords) {
$fullsize = 120;
$halfsize = (int)($fullsize/2);
$message = strip_tags($message);
foreach ($keywords as $keyword) { // Just get the first one
if ($keyword !== '') {
break;
}
}
if (empty($keyword)) { // None found, so just return start of message
return message_shorten_message($message, 30);
}
$leadin = $leadout = '';
/// Find the start of the fragment
$start = 0;
$length = strlen($message);
$pos = strpos($message, $keyword);
if ($pos > $halfsize) {
$start = $pos - $halfsize;
$leadin = '...';
}
/// Find the end of the fragment
$end = $start + $fullsize;
if ($end > $length) {
$end = $length;
} else {
$leadout = '...';
}
/// Pull out the fragment and format it
$fragment = substr($message, $start, $end - $start);
$fragment = $leadin.highlight(implode(' ',$keywords), $fragment).$leadout;
return $fragment;
}
function message_get_history($user1, $user2) {
global $DB;
$messages = $DB->get_records_select('message_read', "(useridto = ? AND useridfrom = ?) OR
(useridto = ? AND useridfrom = ?)", array($user1->id, $user2->id, $user2->id, $user1->id),
'timecreated');
if ($messages_new = $DB->get_records_select('message', "(useridto = ? AND useridfrom = ?) OR
(useridto = ? AND useridfrom = ?)", array($user1->id, $user2->id, $user2->id, $user1->id),
'timecreated')) {
foreach ($messages_new as $message) {
$messages[] = $message;
}
}
return $messages;
}
function message_format_message(&$message, &$user, $format='', $keywords='', $class='other') {
static $dateformat;
if (empty($dateformat)) {
if ($format) {
$dateformat = $format;
} else {
$format = get_string('strftimedatetimeshort');
}
}
$time = userdate($message->timecreated, $dateformat);
$options = new object();
$options->para = false;