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lib.php
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lib.php
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<?php
/// library functions for messaging
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 30 seconds
$CFG->message_contacts_refresh = 30;
}
if (!isset($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;
$timetoshowusers = 300; //Seconds default
if (isset($CFG->block_online_users_timetosee)) {
$timetoshowusers = $CFG->block_online_users_timetosee * 60;
}
$timefrom = time()-$timetoshowusers;
/// get lists of contacts and unread messages
$onlinecontacts = get_records_sql("SELECT u.id, u.firstname, u.lastname, u.picture, mc.blocked
FROM {$CFG->prefix}user u, {$CFG->prefix}message_contacts mc
WHERE mc.userid='$USER->id' AND u.id=mc.contactid AND u.lastaccess>=$timefrom
AND mc.blocked='0'
ORDER BY u.firstname ASC");
$offlinecontacts = get_records_sql("SELECT u.id, u.firstname, u.lastname, u.picture, mc.blocked
FROM {$CFG->prefix}user u, {$CFG->prefix}message_contacts mc
WHERE mc.userid='$USER->id' AND u.id=mc.contactid AND u.lastaccess<$timefrom
AND mc.blocked='0'
ORDER BY u.firstname ASC");
$unreadmessages = get_records_sql("SELECT m.id, m.useridfrom, u.firstname, u.lastname, u.picture
FROM {$CFG->prefix}user u, {$CFG->prefix}message m
WHERE m.useridto='$USER->id' AND u.id=m.useridfrom");
$blockedcontacts = get_records_select('message_contacts', "userid='$USER->id' AND blocked='1'", '', 'contactid, id');
echo '<table id="message_contacts" align="center" cellspacing="2" cellpadding="0" border="0">';
/// print out list of online contacts
$countcontacts = (is_array($onlinecontacts)) ? count($onlinecontacts) : 0;
echo '<tr><td colspan="3" class="message_heading">';
echo get_string('onlinecontacts', 'message', $countcontacts);
echo '</td></tr>';
if (!empty($onlinecontacts)) {
foreach ($onlinecontacts as $contact) {
if ($contact->blocked == 1) continue;
$fullname = fullname($contact);
$fullnamelink = $fullname;
/// are there any unread messages for this contact?
if (($unread = message_count_messages($unreadmessages, 'useridfrom', $contact->id)) > 0) {
$fullnamelink = '<strong>'.$fullnamelink.' ('.$unread.')</strong>';
}
/// link to remove from contact list
$strcontact = message_contact_link($contact->id, 'remove', true);
$strhistory = message_history_link($contact->id, 0, true, '', '', 'icon');
echo '<tr><td class="message_pix">';
print_user_picture($contact->id, SITEID, $contact->picture, 20, false, true, 'userwindow');
echo '</td>';
echo '<td class="message_contact">';
link_to_popup_window("/message/user.php?id=$contact->id", "message_$contact->id",
$fullnamelink, 500, 500, get_string('sendmessageto', 'message', $fullname),
'menubar=0,location=0,status,scrollbars,resizable,width=500,height=500');
echo '</td>';
echo '<td class="message_link">'.$strcontact.' '.$strhistory.'</td>';
echo '</tr>';
}
}
echo '<tr><td colspan="3"> </td></tr>';
/// print out list of offline contacts
$countcontacts = (is_array($offlinecontacts)) ? count($offlinecontacts) : 0;
echo '<tr><td colspan="3" class="message_heading">';
echo get_string('offlinecontacts', 'message', $countcontacts);
echo '</td></tr>';
if (!empty($offlinecontacts)) {
foreach ($offlinecontacts as $contact) {
if ($contact->blocked == 1) continue;
$fullname = fullname($contact);
$fullnamelink = $fullname;
/// are there any unread messages for this contact?
if (($unread = message_count_messages($unreadmessages, 'useridfrom', $contact->id)) > 0) {
$fullnamelink = '<strong>'.$fullnamelink.' ('.$unread.')</strong>';
}
/// link to remove from contact list
$strcontact = message_contact_link($contact->id, 'remove', true);
$strhistory = message_history_link($contact->id, 0, true, '', '', 'icon');
echo '<tr><td class="message_pix">';
print_user_picture($contact->id, SITEID, $contact->picture, 20, false, true, 'userwindow');
echo '</td>';
echo '<td class="message_contact">';
link_to_popup_window("/message/user.php?id=$contact->id", "message_$contact->id",
$fullnamelink, 500, 500, get_string('sendmessageto', 'message', $fullname),
'menubar=0,location=0,status,scrollbars,resizable,width=500,height=500');
echo '</td>';
echo '<td class="message_link">'.$strcontact.' '.$strhistory.'</td>';
echo '</tr>';
}
}
echo '<tr><td colspan="3"> </td></tr>';
/// Cycle through messages and extract those that are from unknown contacts
/// We can take advantage of the keys for $onlinecontacts and $offlinecontacts
/// which are set to the userid and therefore we just need to see if the key
/// exists in either of those arrays
/// We can also discard any messages from users in our blocked contact list
$unknownmessages = array();
if (!empty($unreadmessages)) {
/// make sure we have valid arrays to test against - they may be boolean false
if (empty($onlinecontacts)) $onlinecontacts = array();
if (empty($offlinecontacts)) $offlinecontacts = array();
if (empty($blockedcontacts)) $blockedcontacts = array();
foreach ($unreadmessages as $unreadmessage) {
if (array_key_exists($unreadmessage->useridfrom, $onlinecontacts) or
array_key_exists($unreadmessage->useridfrom, $offlinecontacts) or
array_key_exists($unreadmessage->useridfrom, $blockedcontacts) ) {
continue;
}
if (!isset($unknownmessages[$unreadmessage->useridfrom])) {
$message = $unreadmessage;
$message->count = 1;
$unknownmessages[$unreadmessage->useridfrom] = $message;
} else {
$unknownmessages[$unreadmessage->useridfrom]->count++;
}
}
}
/// print out list of incoming contacts
if (!empty($unknownmessages)) {
echo '<tr><td colspan="3" class="message_heading">';
echo get_string('incomingcontacts', 'message', count($unknownmessages));
echo '</td></tr>';
foreach ($unknownmessages as $messageuser) {
$fullname = fullname($messageuser);
$fullnamelink = $fullname;
if ($messageuser->count) {
$fullnamelink = '<strong>'.$fullnamelink.' ('.$messageuser->count.')</strong>';
}
/// link to add to contact list
$strcontact = message_contact_link($messageuser->useridfrom, 'add', true);
$strblock = message_contact_link($messageuser->useridfrom, 'block', true);
$strhistory = message_history_link($messageuser->useridfrom, 0, true, '', '', 'icon');
echo '<tr><td class="message_pix">';
print_user_picture($messageuser->useridfrom, SITEID, $messageuser->picture, 20, false, true, 'userwindow');
echo '</td>';
echo '<td class="message_contact">';
link_to_popup_window("/message/user.php?id=$messageuser->useridfrom", "message_$messageuser->useridfrom",
$fullnamelink, 500, 500, get_string('sendmessageto', 'message', $fullname),
'menubar=0,location=0,status,scrollbars,resizable,width=500,height=500');
echo '</td>';
echo '<td class="message_link"> '.$strcontact.' '.$strblock.' '.$strhistory.'</td>';
echo '</tr>';
}
}
echo '</table>';
echo '<p align="center" class="message_small_note">'.get_string('pagerefreshes', 'message', $CFG->message_contacts_refresh).'</p>';
}
/// $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 $USER;
if ($frm = data_submitted()) {
message_print_search_results($frm);
} else {
if ($teachers = get_records('user_teachers', 'userid', $USER->id, '', 'id, course')) {
$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->course]->shortname."</option>\n";
}
$cs .= '</select>';
}
include('search.html');
}
}
function message_print_settings() {
global $USER;
if ($frm = data_submitted()) {
$pref = array();
$pref['message_showmessagewindow'] = (isset($frm->showmessagewindow)) ? '1' : '0';
$pref['message_beepnewmessage'] = (isset($frm->beepnewmessage)) ? '1' : '0';
$pref['message_usehtmleditor'] = (isset($frm->usehtmleditor)) ? '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"' : '';
$cbusehtmleditor = (get_user_preferences('message_usehtmleditor', 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);
$format_select = choose_from_menu( array(FORMAT_PLAIN => get_string('formatplain'),
FORMAT_HTML => get_string('formathtml')),
'emailformat',
get_user_preferences('message_emailformat', FORMAT_PLAIN),
false, '', '0', true );
include('settings.html');
}
function message_add_contact($contactid, $blocked=0) {
global $USER;
if (!record_exists('user', 'id', $contactid)) { // invalid userid
return false;
}
if (($contact = get_record('message_contacts', '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 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 insert_record('message_contacts', $contact, false);
}
}
function message_remove_contact($contactid) {
global $USER;
return delete_records('message_contacts', 'userid', $USER->id, 'contactid', $contactid);
}
function message_unblock_contact($contactid) {
global $USER;
return delete_records('message_contacts', 'userid', $USER->id, 'contactid', $contactid);
}
function message_block_contact($contactid) {
return message_add_contact($contactid, 1);
}
function message_get_contact($contactid) {
global $USER;
return get_record('message_contacts', 'userid', $USER->id, 'contactid', $contactid);
}
function message_print_search_results($frm) {
global $USER, $CFG;
echo '<div align="center">';
/// search for person
if (!empty($frm->personsubmit) and !empty($frm->name)) {
if ($frm->mycourses) {
$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 $user) {
if (($contact = message_get_contact($user->id)) !== false) {
if ($contact->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="message_pix">';
print_user_picture($user->id, SITEID, $user->picture, 20, false, true, 'userwindow');
echo '</td>';
echo '<td class="message_contact">';
link_to_popup_window("/message/user.php?id=$user->id", "message_$user->id", fullname($user),
500, 500, get_string('sendmessageto', 'message', fullname($user)),
'menubar=0,location=0,status,scrollbars,resizable,width=500,height=500');
echo '</td>';
echo '<td class="message_link">'.$strcontact.'</td>';
echo '<td class="message_link">'.$strblock.'</td>';
echo '<td class="message_link">'.$strhistory.'</td>';
echo '</tr>';
}
echo '</table>';
} else {
notify(get_string('nosearchresults', 'message'));
}
/// search messages for keywords
} else if (!empty($frm->keywordssubmit) and !empty($frm->keywords)) {
$keywordstring = clean_text(trim($frm->keywords));
$keywords = explode(' ', $keywordstring);
$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 = get_records('message_contacts', 'userid', $USER->id, '', 'contactid, blocked') ) === false) {
$contacts = array();
}
/// print heading with number of results
echo '<p class="message_heading">'.get_string('keywordssearchresults', 'message', count($messages)).' ("'.s($keywordstring).'")</p>';
/// print table headings
echo '<table class="message_search_results">';
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('strftimedatetime');
$strcontext = get_string('context', 'message');
foreach ($messages as $message) {
/// ignore messages to and from blocked users unless $frm->includeblocked is set
if ((!$frm->includeblocked) 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 = get_record('user', '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 = get_record('user', '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'].$date['mday'];
/// print out message row
echo '<tr valign="top">';
echo '<td class="message_contact">';
message_print_user($userfrom, $fromcontact, $fromblocked);
echo '</td>';
echo '<td class="message_contact">';
message_print_user($userto, $tocontact, $toblocked);
echo '</td>';
echo '<td class="message_summary">'.message_get_fragment($message->message, $keywords);
echo '<br /><div class="message_summary_link">';
message_history_link($message->useridto, $message->useridfrom, false,
$keywordstring, 'm'.$message->id, $strcontext);
echo '</div>';
echo '</td>';
echo '<td class="message_date">'.userdate($message->timecreated, $dateformat).'</td>';
echo "</tr>\n";
}
if ($blockedcount > 0) {
echo '<tr><td colspan="4" align="center">'.get_string('blockedmessages', 'message', $blockedcount).'</td></tr>';
}
echo '</table>';
} else {
notify(get_string('nosearchresults', 'message'));
}
/// what the ????, probably an empty search string, duh!
} else {
notify(get_string('emptysearchstring', 'message'));
}
echo '<br />';
print_single_button('index.php', array( 'tab' => 'search'), get_string('newsearch', 'message') );
echo '</div>';
}
function message_print_user ($user=false, $iscontact=false, $isblocked=false) {
global $USER;
if ($user === false) {
print_user_picture($USER->id, SITEID, $USER->picture, 20, false, true, 'userwindow');
} else {
print_user_picture($user->id, SITEID, $user->picture, 20, false, true, 'userwindow');
echo ' ';
if ($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($user->id, 'block');
}
echo '<br />';
link_to_popup_window("/message/user.php?id=$user->id", "message_$user->id",
fullname($user), 400, 400, get_string('sendmessageto', 'message', fullname($user)),
'menubar=0,location=0,status,scrollbars,resizable,width=500,height=500');
}
}
/// linktype can be: add, remove, block, unblock
function message_contact_link($userid, $linktype='add', $return=false, $script="index.php?tab=contacts") {
global $USER, $CFG;
static $str;
if (empty($str->blockcontact)) {
$str->blockcontact = get_string('blockcontact', 'message');
$str->unblockcontact = get_string('unblockcontact', 'message');
$str->removecontact = get_string('removecontact', 'message');
$str->addcontact = get_string('addcontact', 'message');
}
switch ($linktype) {
case 'block':
$output = '<a href="'.$script.'&blockcontact='.$userid.
'&sesskey='.$USER->sesskey.'" title="'.$str->blockcontact.'">'.
'<img src="'.$CFG->pixpath.'/t/go.gif" height="11" width="11" border="0"></a>';
break;
case 'unblock':
$output = '<a href="'.$script.'&unblockcontact='.$userid.
'&sesskey='.$USER->sesskey.'" title="'.$str->unblockcontact.'">'.
'<img src="'.$CFG->pixpath.'/t/stop.gif" height="11" width="11" border="0"></a>';
break;
case 'remove':
$output = '<a href="'.$script.'&removecontact='.$userid.
'&sesskey='.$USER->sesskey.'" title="'.$str->removecontact.'">'.
'<img src="'.$CFG->pixpath.'/t/user.gif" height="11" width="11" border="0"></a>';
break;
case 'add':
default:
$output = '<a href="'.$script.'&addcontact='.$userid.
'&sesskey='.$USER->sesskey.'" title="'.$str->addcontact.'">'.
'<img src="'.$CFG->pixpath.'/t/usernot.gif" height="11" width="11" border="0"></a>';
}
if ($return) {
return $output;
} else {
echo $output;
return true;
}
}
function message_history_link($userid1, $userid2=0, $returnstr=false, $keywords='', $position='', $linktext='') {
global $USER, $CFG;
if (!$userid2) {
$userid2 = $USER->id;
}
if ($position) {
$position = "#$position";
}
if ($keywords) {
$keywords = "&search=".urlencode($keywords);
}
if ($linktext == 'icon') {
$linktext = '<img src="'.$CFG->pixpath.'/t/log.gif" height="11" width="11" border="0">';
} else if ($linktext == '') {
$linktext = get_string('messagehistory', 'message');
}
$str = link_to_popup_window("/message/history.php?user1=$userid1&user2=$userid2$keywords$position",
"message_history_$userid1", $linktext, 500, 500, '',
'menubar=0,location=0,status,scrollbars,resizable,width=500,height=500', true);
if ($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
* @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 $CFG;
switch ($CFG->dbtype) {
case 'mysql':
$fullname = ' CONCAT(u.firstname," ",u.lastname) ';
$LIKE = 'LIKE';
break;
case 'postgres7':
$fullname = " u.firstname||' '||u.lastname ";
$LIKE = 'ILIKE';
break;
default:
$fullname = ' u.firstname||" "||u.lastname ';
$LIKE = 'ILIKE';
}
if (!empty($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\'';
$fields = 'u.id, u.firstname, u.lastname, u.picture';
if (!$courseid or $courseid == SITEID) {
return get_records_sql("SELECT $fields
FROM {$CFG->prefix}user u
WHERE $select
AND ($fullname $LIKE '%$searchtext%')
$except $order");
} else {
if (!$teachers = get_records_sql("SELECT $fields
FROM {$CFG->prefix}user u,
{$CFG->prefix}user_teachers s
WHERE $select AND s.course = '$courseid' AND s.userid = u.id
AND ($fullname $LIKE '%$searchtext%')
$except $order")) {
$teachers = array();
}
if (!$students = get_records_sql("SELECT $fields
FROM {$CFG->prefix}user u,
{$CFG->prefix}user_students s
WHERE $select AND s.course = '$courseid' AND s.userid = u.id
AND ($fullname $LIKE '%$searchtext%')
$except $order")) {
$students = array();
}
return $teachers + $students;
}
}
function message_search($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, $USER;
/// If no userid sent then assume current user
if ($userid == 0) $userid = $USER->id;
/// Some differences in syntax for PostgreSQL
if ($CFG->dbtype == "postgres7") {
$LIKE = "ILIKE"; // case-insensitive
$NOTLIKE = "NOT ILIKE"; // case-insensitive
$REGEXP = "~*";
$NOTREGEXP = "!~*";
} else {
$LIKE = "LIKE";
$NOTLIKE = "NOT LIKE";
$REGEXP = "REGEXP";
$NOTREGEXP = "NOT REGEXP";
}
$messagesearch = "";
foreach ($searchterms as $searchterm) {
if (strlen($searchterm) < 2) {
continue;
}
if ($messagesearch) {
$messagesearch .= " AND ";
}
if (substr($searchterm,0,1) == "+") {
$searchterm = substr($searchterm,1);
$messagesearch .= " m.message $REGEXP '(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)' ";
} else if (substr($searchterm,0,1) == "-") {
$searchterm = substr($searchterm,1);
$messagesearch .= " m.message $NOTREGEXP '(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)' ";
} else {
$messagesearch .= " m.message $LIKE '%$searchterm%' ";
}
}
$messagesearch = "($messagesearch) ";
/// 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
$m_read = get_records_sql("SELECT m.id, m.useridto, m.useridfrom, m.message, m.timecreated
FROM {$CFG->prefix}message_read m
WHERE $messagesearch");
$m_unread = get_records_sql("SELECT m.id, m.useridto, m.useridfrom, m.message, m.timecreated
FROM {$CFG->prefix}message m
WHERE $messagesearch");
if ($m_read === false) $m_read = array();
if ($m_unread === false) $m_unread = array();
} elseif ($courseid !== 'none') {
/// This has not been implemented due to security concerns
} else {
if ($fromme and $tome) $messagesearch .= "AND (m.useridfrom='$userid' OR m.useridto='$userid') ";
elseif ($fromme) $messagesearch .= "AND m.useridfrom='$userid' ";
elseif ($tome) $messagesearch .= "AND m.useridto='$userid' ";
$m_read = get_records_sql("SELECT m.id, m.useridto, m.useridfrom, m.message, m.timecreated
FROM {$CFG->prefix}message_read m
WHERE $messagesearch");
$m_unread = get_records_sql("SELECT m.id, m.useridto, m.useridfrom, m.message, m.timecreated
FROM {$CFG->prefix}message m
WHERE $messagesearch");
if ($m_read === false) $m_read = array();
if ($m_unread === false) $m_unread = array();
}
/// 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) {
$messages = get_records_select('message_read', "(useridto = '$user1->id' AND useridfrom = '$user2->id') OR
(useridto = '$user2->id' AND useridfrom = '$user1->id')",
'timecreated');
if ($messages_new = get_records_select('message', "(useridto = '$user1->id' AND useridfrom = '$user2->id') OR
(useridto = '$user2->id' AND useridfrom = '$user1->id')",
'timecreated')) {
foreach ($messages_new as $message) {
$messages[] = $message;
}
}
return $messages;
}
function message_format_message(&$message, &$user, $format='', $keywords='') {
if (empty($format)) {
$format = get_string('strftimedaytime');
}
$time = userdate($message->timecreated, $format);
$options->para = false;
$messagetext = format_text($message->message, $message->format, $options);
if ($keywords) {
$messagetext = highlight($keywords, $messagetext);
}
return '<p><a name="m'.$message->id.'"></a><font size="-1"><strong>'.s($user->firstname).'</strong> ['.$time.']: '.
$messagetext.'</font></p>';
}
/*
* Inserts a message into the database, but also forwards it
* via other means if appropriate.
*/
function message_post_message($userfrom, $userto, $message, $format, $messagetype) {
global $CFG, $SITE;
/// Save the new message in the database
$savemessage = NULL;
$savemessage->useridfrom = $userfrom->id;
$savemessage->useridto = $userto->id;
$savemessage->message = $message;
$savemessage->format = $format;
$savemessage->timecreated = time();
$savemessage->messagetype = 'direct';
if (!$savemessage->id = insert_record('message', $savemessage)) {
return false;
}
/// Check to see if anything else needs to be done with it
$preference = (object)get_user_preferences(NULL, NULL, $userto->id);
if (!empty($preference->message_emailmessages)) { // Receiver wants mail forwarding
if ((time() - $userto->lastaccess) > ((int)$preference->message_emailtimenosee * 60)) { // Long enough
$message = stripslashes_safe($message);
$tagline = get_string('emailtagline', 'message', $SITE->shortname);
$messagesubject = message_shorten_message(strip_tags($message), 30).'...';
$messagetext = format_text_email($message, $format).
"\n\n--\n".$tagline."\n"."$CFG->wwwroot/message/index.php?popup=1";
if ($preference->message_emailformat == FORMAT_HTML) {
$messagehtml = format_text($message, $format);
$messagehtml .= '<hr /><p><a href="'.$CFG->wwwroot.'/message/index.php?popup=1">'.$tagline.'</a></p>';
} else {
$messagehtml = NULL;
}
$userto->email = $preference->message_emailaddress; // Use custom messaging address
email_to_user($userto, $userfrom, $messagesubject, $messagetext, $messagehtml);
}
}
return $savemessage->id;
}
/*
* Returns a list of all user ids who have used messaging in the site
* This was the simple way to code the SQL ... is it going to blow up
* on large datasets?
*/
function message_get_participants() {
global $CFG;
return get_records_sql("SELECT DISTINCT u.id, u.id
FROM {$CFG->prefix}user as u,
{$CFG->prefix}message as m,
{$CFG->prefix}message_read as mr,
{$CFG->prefix}message_contacts as mc
WHERE m.useridfrom = u.id
OR m.useridto = u.id
OR mr.useridfrom = u.id
OR mr.useridto = u.id
OR mc.userid = u.id
OR mc.contactid = u.id");
}
?>