message/lib.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * Library functions for messaging
  20  *
  21  * @copyright Luis Rodrigues
  22  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23  * @package message
  24  */
  25
  26 require_once($CFG->libdir.'/eventslib.php');
  27
  28 define ('MESSAGE_SHORTLENGTH', 300);
  29
  30 //$PAGE isnt set if we're being loaded by cron which doesnt display popups anyway
  31 if (isset($PAGE)) {
  32     $PAGE->set_popup_notification_allowed(false); // We are in a message window (so don't pop up a new one)
  33 }
  34
  35 define ('MESSAGE_DISCUSSION_WIDTH',600);
  36 define ('MESSAGE_DISCUSSION_HEIGHT',500);
  37
  38 define ('MESSAGE_SHORTVIEW_LIMIT', 8);//the maximum number of messages to show on the short message history
  39
  40 define('MESSAGE_HISTORY_SHORT',0);
  41 define('MESSAGE_HISTORY_ALL',1);
  42
  43 define('MESSAGE_VIEW_UNREAD_MESSAGES','unread');
  44 define('MESSAGE_VIEW_RECENT_CONVERSATIONS','recentconversations');
  45 define('MESSAGE_VIEW_RECENT_NOTIFICATIONS','recentnotifications');
  46 define('MESSAGE_VIEW_CONTACTS','contacts');
  47 define('MESSAGE_VIEW_BLOCKED','blockedusers');
  48 define('MESSAGE_VIEW_COURSE','course_');
  49 define('MESSAGE_VIEW_SEARCH','search');
  50
  51 define('MESSAGE_SEARCH_MAX_RESULTS', 200);
  52
  53 define('MESSAGE_CONTACTS_PER_PAGE',10);
  54 define('MESSAGE_MAX_COURSE_NAME_LENGTH', 30);
  55
  56 if (!isset($CFG->message_contacts_refresh)) {  // Refresh the contacts list every 60 seconds
  57     $CFG->message_contacts_refresh = 60;
  58 }
  59 if (!isset($CFG->message_chat_refresh)) {      // Look for new comments every 5 seconds
  60     $CFG->message_chat_refresh = 5;
  61 }
  62 if (!isset($CFG->message_offline_time)) {
  63     $CFG->message_offline_time = 300;
  64 }
  65
  66 /**
  67 * Print the selector that allows the user to view their contacts, course participants, their recent
  68 * conversations etc
  69 * @param int $countunreadtotal how many unread messages does the user have?
  70 * @param int $viewing What is the user viewing? ie MESSAGE_VIEW_UNREAD_MESSAGES, MESSAGE_VIEW_SEARCH etc
  71 * @param object $user1 the user whose messages are being viewed
  72 * @param object $user2 the user $user1 is talking to
  73 * @param array $blockedusers an array of users blocked by $user1
  74 * @param array $onlinecontacts an array of $user1's online contacts
  75 * @param array $offlinecontacts an array of $user1's offline contacts
  76 * @param array $strangers an array of users who have messaged $user1 who aren't contacts
  77 * @param bool $showcontactactionlinks show action links (add/remove contact etc) next to the users in the contact selector
  78 * @param int $page if there are so many users listed that they have to be split into pages what page are we viewing
  79 * @return void
  80 */
  81 function message_print_contact_selector($countunreadtotal, $viewing, $user1, $user2, $blockedusers, $onlinecontacts, $offlinecontacts, $strangers, $showcontactactionlinks, $page=0) {
  82     global $PAGE;
  83
  84     echo html_writer::start_tag('div', array('class' => 'contactselector mdl-align'));
  85
  86     //if 0 unread messages and they've requested unread messages then show contacts
  87     if ($countunreadtotal == 0 && $viewing == MESSAGE_VIEW_UNREAD_MESSAGES) {
  88         $viewing = MESSAGE_VIEW_CONTACTS;
  89     }
  90
  91     //if they have no blocked users and they've requested blocked users switch them over to contacts
  92     if (count($blockedusers) == 0 && $viewing == MESSAGE_VIEW_BLOCKED) {
  93         $viewing = MESSAGE_VIEW_CONTACTS;
  94     }
  95
  96     $onlyactivecourses = true;
  97     $courses = enrol_get_users_courses($user1->id, $onlyactivecourses);
  98     $coursecontexts = message_get_course_contexts($courses);//we need one of these again so holding on to them
  99
 100     $strunreadmessages = null;
 101     if ($countunreadtotal>0) { //if there are unread messages
 102         $strunreadmessages = get_string('unreadmessages','message', $countunreadtotal);
 103     }
 104
 105     message_print_usergroup_selector($viewing, $courses, $coursecontexts, $countunreadtotal, count($blockedusers), $strunreadmessages);
 106
 107     if ($viewing == MESSAGE_VIEW_UNREAD_MESSAGES) {
 108         message_print_contacts($onlinecontacts, $offlinecontacts, $strangers, $PAGE->url, 1, $showcontactactionlinks,$strunreadmessages, $user2);
 109     } else if ($viewing == MESSAGE_VIEW_CONTACTS || $viewing == MESSAGE_VIEW_SEARCH || $viewing == MESSAGE_VIEW_RECENT_CONVERSATIONS || $viewing == MESSAGE_VIEW_RECENT_NOTIFICATIONS) {
 110         message_print_contacts($onlinecontacts, $offlinecontacts, $strangers, $PAGE->url, 0, $showcontactactionlinks, $strunreadmessages, $user2);
 111     } else if ($viewing == MESSAGE_VIEW_BLOCKED) {
 112         message_print_blocked_users($blockedusers, $PAGE->url, $showcontactactionlinks, null, $user2);
 113     } else if (substr($viewing, 0, 7) == MESSAGE_VIEW_COURSE) {
 114         $courseidtoshow = intval(substr($viewing, 7));
 115
 116         if (!empty($courseidtoshow)
 117             && array_key_exists($courseidtoshow, $coursecontexts)
 118             && has_capability('moodle/course:viewparticipants', $coursecontexts[$courseidtoshow])) {
 119
 120             message_print_participants($coursecontexts[$courseidtoshow], $courseidtoshow, $PAGE->url, $showcontactactionlinks, null, $page, $user2);
 121         } else {
 122             //shouldn't get here. User trying to access a course they're not in perhaps.
 123             add_to_log(SITEID, 'message', 'view', 'index.php', $viewing);
 124         }
 125     }
 126
 127     echo html_writer::start_tag('form', array('action' => 'index.php','method' => 'GET'));
 128     echo html_writer::start_tag('fieldset');
 129     $managebuttonclass = 'visible';
 130     if ($viewing == MESSAGE_VIEW_SEARCH) {
 131         $managebuttonclass = 'hiddenelement';
 132     }
 133     $strmanagecontacts = get_string('search','message');
 134     echo html_writer::empty_tag('input', array('type' => 'hidden','name' => 'viewing','value' => MESSAGE_VIEW_SEARCH));
 135     echo html_writer::empty_tag('input', array('type' => 'submit','value' => $strmanagecontacts,'class' => $managebuttonclass));
 136     echo html_writer::end_tag('fieldset');
 137     echo html_writer::end_tag('form');
 138
 139     echo html_writer::end_tag('div');
 140 }
 141
 142 /**
 143 * Print course participants. Called by message_print_contact_selector()
 144 * @param object $context the course context
 145 * @param int $courseid the course ID
 146 * @param string $contactselecturl the url to send the user to when a contact's name is clicked
 147 * @param bool $showactionlinks show action links (add/remove contact etc) next to the users
 148 * @param string $titletodisplay Optionally specify a title to display above the participants
 149 * @param int $page if there are so many users listed that they have to be split into pages what page are we viewing
 150 * @param object $user2 the user $user1 is talking to. They will be highlighted if they appear in the list of participants
 151 * @return void
 152 */
 153 function message_print_participants($context, $courseid, $contactselecturl=null, $showactionlinks=true, $titletodisplay=null, $page=0, $user2=null) {
 154     global $DB, $USER, $PAGE, $OUTPUT;
 155
 156     if (empty($titletodisplay)) {
 157         $titletodisplay = get_string('participants');
 158     }
 159
 160     $countparticipants = count_enrolled_users($context);
 161     $participants = get_enrolled_users($context, '', 0, 'u.*', '', $page*MESSAGE_CONTACTS_PER_PAGE, MESSAGE_CONTACTS_PER_PAGE);
 162
 163     $pagingbar = new paging_bar($countparticipants, $page, MESSAGE_CONTACTS_PER_PAGE, $PAGE->url, 'page');
 164     echo $OUTPUT->render($pagingbar);
 165
 166     echo html_writer::start_tag('table', array('id' => 'message_participants', 'class' => 'boxaligncenter', 'cellspacing' => '2', 'cellpadding' => '0', 'border' => '0'));
 167
 168     echo html_writer::start_tag('tr');
 169     echo html_writer::tag('td', $titletodisplay, array('colspan' => 3, 'class' => 'heading'));
 170     echo html_writer::end_tag('tr');
 171
 172     //todo these need to come from somewhere if the course participants list is to show users with unread messages
 173     $iscontact = true;
 174     $isblocked = false;
 175     foreach ($participants as $participant) {
 176         if ($participant->id != $USER->id) {
 177             $participant->messagecount = 0;//todo it would be nice if the course participant could report new messages
 178             message_print_contactlist_user($participant, $iscontact, $isblocked, $contactselecturl, $showactionlinks, $user2);
 179         }
 180     }
 181
 182     echo html_writer::end_tag('table');
 183 }
 184
 185 /**
 186 * Retrieve users blocked by $user1
 187 * @param object $user1 the user whose messages are being viewed
 188 * @param object $user2 the user $user1 is talking to. If they are being blocked
 189 *                      they will have a variable called 'isblocked' added to their user object
 190 * @return array the users blocked by $user1
 191 */
 192 function message_get_blocked_users($user1=null, $user2=null) {
 193     global $DB, $USER;
 194
 195     if (empty($user1)) {
 196         $user1 = $USER;
 197     }
 198
 199     if (!empty($user2)) {
 200         $user2->isblocked = false;
 201     }
 202
 203     $userfields = user_picture::fields('u', array('lastaccess'));
 204     $blockeduserssql = "SELECT $userfields, COUNT(m.id) AS messagecount
 205                           FROM {message_contacts} mc
 206                           JOIN {user} u ON u.id = mc.contactid
 207                           LEFT OUTER JOIN {message} m ON m.useridfrom = mc.contactid AND m.useridto = :user1id1
 208                          WHERE mc.userid = :user1id2 AND mc.blocked = 1
 209                       GROUP BY $userfields
 210                       ORDER BY u.firstname ASC";
 211     $rs =  $DB->get_recordset_sql($blockeduserssql, array('user1id1' => $user1->id, 'user1id2' => $user1->id));
 212
 213     $blockedusers = array();
 214     if (!empty($rs)) {
 215         foreach($rs as $rd) {
 216             $blockedusers[] = $rd;
 217
 218             if (!empty($user2) && $user2->id == $rd->id) {
 219                 $user2->isblocked = true;
 220             }
 221         }
 222         unset($rd);
 223         $rs->close();
 224     }
 225
 226     return $blockedusers;
 227 }
 228
 229 /**
 230 * Print users blocked by $user1. Called by message_print_contact_selector()
 231 * @param array $blockedusers the users blocked by $user1
 232 * @param string $contactselecturl the url to send the user to when a contact's name is clicked
 233 * @param bool $showactionlinks show action links (add/remove contact etc) next to the users
 234 * @param string $titletodisplay Optionally specify a title to display above the participants
 235 * @param object $user2 the user $user1 is talking to. They will be highlighted if they appear in the list of blocked users
 236 * @return void
 237 */
 238 function message_print_blocked_users($blockedusers, $contactselecturl=null, $showactionlinks=true, $titletodisplay=null, $user2=null) {
 239     global $DB, $USER;
 240
 241     $countblocked = count($blockedusers);
 242
 243     echo html_writer::start_tag('table', array('id' => 'message_contacts', 'class' => 'boxaligncenter'));
 244
 245     if (!empty($titletodisplay)) {
 246         echo html_writer::start_tag('tr');
 247         echo html_writer::tag('td', $titletodisplay, array('colspan' => 3, 'class' => 'heading'));
 248         echo html_writer::end_tag('tr');
 249     }
 250
 251     if ($countblocked) {
 252         echo html_writer::start_tag('tr');
 253         echo html_writer::tag('td', get_string('blockedusers', 'message', $countblocked), array('colspan' => 3, 'class' => 'heading'));
 254         echo html_writer::end_tag('tr');
 255
 256         $isuserblocked = true;
 257         $isusercontact = false;
 258         foreach ($blockedusers as $blockeduser) {
 259             message_print_contactlist_user($blockeduser, $isusercontact, $isuserblocked, $contactselecturl, $showactionlinks, $user2);
 260         }
 261     }
 262
 263     echo html_writer::end_tag('table');
 264 }
 265
 266 /**
 267 * Retrieve $user1's contacts (online, offline and strangers)
 268 * @param object $user1 the user whose messages are being viewed
 269 * @param object $user2 the user $user1 is talking to. If they are a contact
 270 *                      they will have a variable called 'iscontact' added to their user object
 271 * @return array containing 3 arrays. array($onlinecontacts, $offlinecontacts, $strangers)
 272 */
 273 function message_get_contacts($user1=null, $user2=null) {
 274     global $DB, $CFG, $USER;
 275
 276     if (empty($user1)) {
 277         $user1 = $USER;
 278     }
 279
 280     if (!empty($user2)) {
 281         $user2->iscontact = false;
 282     }
 283
 284     $timetoshowusers = 300; //Seconds default
 285     if (isset($CFG->block_online_users_timetosee)) {
 286         $timetoshowusers = $CFG->block_online_users_timetosee * 60;
 287     }
 288
 289     // time which a user is counting as being active since
 290     $timefrom = time()-$timetoshowusers;
 291
 292     // people in our contactlist who are online
 293     $onlinecontacts  = array();
 294     // people in our contactlist who are offline
 295     $offlinecontacts = array();
 296     // people who are not in our contactlist but have sent us a message
 297     $strangers       = array();
 298
 299     $userfields = user_picture::fields('u', array('lastaccess'));
 300
 301     // get all in our contactlist who are not blocked in our contact list
 302     // and count messages we have waiting from each of them
 303     $contactsql = "SELECT $userfields, COUNT(m.id) AS messagecount
 304                      FROM {message_contacts} mc
 305                      JOIN {user} u ON u.id = mc.contactid
 306                      LEFT OUTER JOIN {message} m ON m.useridfrom = mc.contactid AND m.useridto = ?
 307                     WHERE mc.userid = ? AND mc.blocked = 0
 308                  GROUP BY $userfields
 309                  ORDER BY u.firstname ASC";
 310
 311     $rs = $DB->get_recordset_sql($contactsql, array($user1->id, $user1->id));
 312     foreach ($rs as $rd) {
 313         if ($rd->lastaccess >= $timefrom) {
 314             // they have been active recently, so are counted online
 315             $onlinecontacts[] = $rd;
 316
 317         } else {
 318             $offlinecontacts[] = $rd;
 319         }
 320
 321         if (!empty($user2) && $user2->id == $rd->id) {
 322             $user2->iscontact = true;
 323         }
 324     }
 325     $rs->close();
 326
 327     // get messages from anyone who isn't in our contact list and count the number
 328     // of messages we have from each of them
 329     $strangersql = "SELECT $userfields, count(m.id) as messagecount
 330                       FROM {message} m
 331                       JOIN {user} u  ON u.id = m.useridfrom
 332                       LEFT OUTER JOIN {message_contacts} mc ON mc.contactid = m.useridfrom AND mc.userid = m.useridto
 333                      WHERE mc.id IS NULL AND m.useridto = ?
 334                   GROUP BY $userfields
 335                   ORDER BY u.firstname ASC";
 336
 337     $rs = $DB->get_recordset_sql($strangersql, array($USER->id));
 338     foreach ($rs as $rd) {
 339         $strangers[] = $rd;
 340     }
 341     $rs->close();
 342
 343     return array($onlinecontacts, $offlinecontacts, $strangers);
 344 }
 345
 346 /**
 347 * Print $user1's contacts. Called by message_print_contact_selector()
 348 * @param array $onlinecontacts $user1's contacts which are online
 349 * @param array $offlinecontacts $user1's contacts which are offline
 350 * @param array $strangers users which are not contacts but who have messaged $user1
 351 * @param string $contactselecturl the url to send the user to when a contact's name is clicked
 352 * @param int $minmessages The minimum number of unread messages required from a user for them to be displayed
 353 *                         Typically 0 (show all contacts) or 1 (only show contacts from whom we have a new message)
 354 * @param bool $showactionlinks show action links (add/remove contact etc) next to the users
 355 * @param string $titletodisplay Optionally specify a title to display above the participants
 356 * @param object $user2 the user $user1 is talking to. They will be highlighted if they appear in the list of contacts
 357 * @return void
 358 */
 359 function message_print_contacts($onlinecontacts, $offlinecontacts, $strangers, $contactselecturl=null, $minmessages=0, $showactionlinks=true, $titletodisplay=null, $user2=null) {
 360     global $CFG, $PAGE, $OUTPUT;
 361
 362     $countonlinecontacts  = count($onlinecontacts);
 363     $countofflinecontacts = count($offlinecontacts);
 364     $countstrangers       = count($strangers);
 365     $isuserblocked = null;
 366
 367     if ($countonlinecontacts + $countofflinecontacts == 0) {
 368         echo html_writer::tag('div', get_string('contactlistempty', 'message'), array('class' => 'heading'));
 369     }
 370
 371     echo html_writer::start_tag('table', array('id' => 'message_contacts', 'class' => 'boxaligncenter'));
 372
 373     if (!empty($titletodisplay)) {
 374         message_print_heading($titletodisplay);
 375     }
 376
 377     if($countonlinecontacts) {
 378         /// print out list of online contacts
 379
 380         if (empty($titletodisplay)) {
 381             message_print_heading(get_string('onlinecontacts', 'message', $countonlinecontacts));
 382         }
 383
 384         $isuserblocked = false;
 385         $isusercontact = true;
 386         foreach ($onlinecontacts as $contact) {
 387             if ($minmessages == 0 || $contact->messagecount >= $minmessages) {
 388                 message_print_contactlist_user($contact, $isusercontact, $isuserblocked, $contactselecturl, $showactionlinks, $user2);
 389             }
 390         }
 391     }
 392
 393     if ($countofflinecontacts) {
 394         /// print out list of offline contacts
 395
 396         if (empty($titletodisplay)) {
 397             message_print_heading(get_string('offlinecontacts', 'message', $countofflinecontacts));
 398         }
 399
 400         $isuserblocked = false;
 401         $isusercontact = true;
 402         foreach ($offlinecontacts as $contact) {
 403             if ($minmessages == 0 || $contact->messagecount >= $minmessages) {
 404                 message_print_contactlist_user($contact, $isusercontact, $isuserblocked, $contactselecturl, $showactionlinks, $user2);
 405             }
 406         }
 407
 408     }
 409
 410     /// print out list of incoming contacts
 411     if ($countstrangers) {
 412         message_print_heading(get_string('incomingcontacts', 'message', $countstrangers));
 413
 414         $isuserblocked = false;
 415         $isusercontact = false;
 416         foreach ($strangers as $stranger) {
 417             if ($minmessages == 0 || $stranger->messagecount >= $minmessages) {
 418                 message_print_contactlist_user($stranger, $isusercontact, $isuserblocked, $contactselecturl, $showactionlinks, $user2);
 419             }
 420         }
 421     }
 422
 423     echo html_writer::end_tag('table');
 424
 425     if ($countstrangers && ($countonlinecontacts + $countofflinecontacts == 0)) {  // Extra help
 426         echo html_writer::tag('div','('.get_string('addsomecontactsincoming', 'message').')',array('class' => 'note'));
 427     }
 428 }
 429
 430 /**
 431 * Print a select box allowing the user to choose to view new messages, course participants etc.
 432 * Called by message_print_contact_selector()
 433 * @param int $viewing What page is the user viewing ie MESSAGE_VIEW_UNREAD_MESSAGES, MESSAGE_VIEW_RECENT_CONVERSATIONS etc
 434 * @param array $courses array of course objects. The courses the user is enrolled in.
 435 * @param array $coursecontexts array of course contexts. Keyed on course id.
 436 * @param int $countunreadtotal how many unread messages does the user have?
 437 * @param int $countblocked how many users has the current user blocked?
 438 * @param string $strunreadmessages a preconstructed message about the number of unread messages the user has
 439 * @return void
 440 */
 441 function message_print_usergroup_selector($viewing, $courses, $coursecontexts, $countunreadtotal, $countblocked, $strunreadmessages) {
 442     $options = array();
 443     $textlib = textlib_get_instance(); // going to use textlib services
 444
 445     if ($countunreadtotal>0) { //if there are unread messages
 446         $options[MESSAGE_VIEW_UNREAD_MESSAGES] = $strunreadmessages;
 447     }
 448
 449     $str = get_string('mycontacts', 'message');
 450     $options[MESSAGE_VIEW_CONTACTS] = $str;
 451
 452     $options[MESSAGE_VIEW_RECENT_CONVERSATIONS] = get_string('mostrecentconversations', 'message');
 453     $options[MESSAGE_VIEW_RECENT_NOTIFICATIONS] = get_string('mostrecentnotifications', 'message');
 454
 455     if (!empty($courses)) {
 456         $courses_options = array();
 457
 458         foreach($courses as $course) {
 459             if (has_capability('moodle/course:viewparticipants', $coursecontexts[$course->id])) {
 460                 //Not using short_text() as we want the end of the course name. Not the beginning.
 461                 if ($textlib->strlen($course->shortname) > MESSAGE_MAX_COURSE_NAME_LENGTH) {
 462                     $courses_options[MESSAGE_VIEW_COURSE.$course->id] = '...'.$textlib->substr($course->shortname, -MESSAGE_MAX_COURSE_NAME_LENGTH);
 463                 } else {
 464                     $courses_options[MESSAGE_VIEW_COURSE.$course->id] = $course->shortname;
 465                 }
 466             }
 467         }
 468
 469         if (!empty($courses_options)) {
 470             $options[] = array(get_string('courses') => $courses_options);
 471         }
 472     }
 473
 474     if ($countblocked>0) {
 475         $str = get_string('blockedusers','message', $countblocked);
 476         $options[MESSAGE_VIEW_BLOCKED] = $str;
 477     }
 478
 479     echo html_writer::start_tag('form', array('id' => 'usergroupform','method' => 'get','action' => ''));
 480         echo html_writer::start_tag('fieldset');
 481             echo html_writer::select($options, 'viewing', $viewing, false, array('id' => 'viewing','onchange' => 'this.form.submit()'));
 482         echo html_writer::end_tag('fieldset');
 483     echo html_writer::end_tag('form');
 484 }
 485
 486 /**
 487 * Load the course contexts for all of the users courses
 488 * @param array $courses array of course objects. The courses the user is enrolled in.
 489 * @return array of course contexts
 490 */
 491 function message_get_course_contexts($courses) {
 492     $coursecontexts = array();
 493
 494     foreach($courses as $course) {
 495         $coursecontexts[$course->id] = get_context_instance(CONTEXT_COURSE, $course->id);
 496     }
 497
 498     return $coursecontexts;
 499 }
 500
 501 /**
 502  * strip off action parameters like 'removecontact'
 503  * @param moodle_url/string $moodleurl a URL. Typically the current page URL.
 504  * @return string the URL minus parameters that perform actions (like adding/removing/blocking a contact).
 505  */
 506 function message_remove_url_params($moodleurl) {
 507     $newurl = new moodle_url($moodleurl);
 508     $newurl->remove_params('addcontact','removecontact','blockcontact','unblockcontact');
 509     return $newurl->out();
 510 }
 511
 512 /**
 513  * Count the number of messages with a field having a specified value.
 514  * if $field is empty then return count of the whole array
 515  * if $field is non-existent then return 0
 516  * @param array $messagearray array of message objects
 517  * @param string $field the field to inspect on the message objects
 518  * @param string $value the value to test the field against
 519  */
 520 function message_count_messages($messagearray, $field='', $value='') {
 521     if (!is_array($messagearray)) return 0;
 522     if ($field == '' or empty($messagearray)) return count($messagearray);
 523
 524     $count = 0;
 525     foreach ($messagearray as $message) {
 526         $count += ($message->$field == $value) ? 1 : 0;
 527     }
 528     return $count;
 529 }
 530
 531 /**
 532  * Returns the count of unread messages for user. Either from a specific user or from all users.
 533  * @param object $user1 the first user. Defaults to $USER
 534  * @param object $user2 the second user. If null this function will count all of user 1's unread messages.
 535  * @return int the count of $user1's unread messages
 536  */
 537 function message_count_unread_messages($user1=null, $user2=null) {
 538     global $USER, $DB;
 539
 540     if (empty($user1)) {
 541         $user1 = $USER;
 542     }
 543
 544     if (!empty($user2)) {
 545         return $DB->count_records_select('message', "useridto = ? AND useridfrom = ?",
 546             array($user1->id, $user2->id), "COUNT('id')");
 547     } else {
 548         return $DB->count_records_select('message', "useridto = ?",
 549             array($user1->id), "COUNT('id')");
 550     }
 551 }
 552
 553 /**
 554  * Count the number of users blocked by $user1
 555  * @param $user1
 556  */
 557 function message_count_blocked_users($user1=null) {
 558     global $USER, $DB;
 559
 560     if (empty($user1)) {
 561         $user1 = $USER;
 562     }
 563
 564     $sql = "SELECT count(mc.id)
 565             FROM {message_contacts} mc
 566             WHERE mc.userid = :userid AND mc.blocked = 1";
 567     $params = array('userid' => $user1->id);
 568
 569     return $DB->count_records_sql($sql, $params);
 570 }
 571
 572 /**
 573  * Print the search form and search results if a search has been performed
 574  * @param  boolean $advancedsearch show basic or advanced search form
 575  * @param  object $user1 the current user
 576  * @return boolean true if a search was performed
 577  */
 578 function message_print_search($advancedsearch = false, $user1=null) {
 579     $frm = data_submitted();
 580
 581     $doingsearch = false;
 582     if ($frm) {
 583         if (confirm_sesskey()) {
 584             $doingsearch = !empty($frm->combinedsubmit) || !empty($frm->keywords) || (!empty($frm->personsubmit) and !empty($frm->name));
 585         } else {
 586             $frm = false;
 587         }
 588     }
 589
 590     if (!empty($frm->combinedsearch)) {
 591         $combinedsearchstring = $frm->combinedsearch;
 592     } else {
 593         //$combinedsearchstring = get_string('searchcombined','message').'...';
 594         $combinedsearchstring = '';
 595     }
 596
 597     if ($doingsearch) {
 598         if ($advancedsearch) {
 599
 600             $messagesearch = '';
 601             if (!empty($frm->keywords)) {
 602                 $messagesearch = $frm->keywords;
 603             }
 604             $personsearch = '';
 605             if (!empty($frm->name)) {
 606                 $personsearch = $frm->name;
 607             }
 608             include('search_advanced.html');
 609         } else {
 610             include('search.html');
 611         }
 612
 613         $showicontext = false;
 614         message_print_search_results($frm, $showicontext, $user1);
 615
 616         return true;
 617     } else {
 618
 619         if ($advancedsearch) {
 620             $personsearch = $messagesearch = '';
 621             include('search_advanced.html');
 622         } else {
 623             include('search.html');
 624         }
 625         return false;
 626     }
 627 }
 628
 629 /**
 630  * Get the users recent conversations meaning all the people they've recently
 631  * sent or received a message from plus the most recent message sent to or received from each other user
 632  * @param object $user the current user
 633  * @param int $limitfrom can be used for paging
 634  * @param int $limitto can be used for paging
 635  * @return array
 636  */
 637 function message_get_recent_conversations($user, $limitfrom=0, $limitto=100) {
 638     global $DB;
 639
 640     $userfields = user_picture::fields('u', array('lastaccess'));
 641     //This query retrieves the last message received from and sent to each user
 642     //It unions that data then, within that set, it finds the most recent message you've exchanged with each user over all
 643     //It then joins with some other tables to get some additional data we need
 644
 645     //message ID is used instead of timecreated as it should sort the same and will be much faster
 646
 647     //There is a separate query for read and unread queries as they are stored in different tables
 648     //They were originally retrieved in one query but it was so large that it was difficult to be confident in its correctness
 649     $sql = "SELECT $userfields, mr.id as mid, mr.smallmessage, mr.fullmessage, mr.timecreated, mc.id as contactlistid, mc.blocked
 650               FROM {message_read} mr
 651               JOIN (
 652                     SELECT messages.userid AS userid, MAX(messages.mid) AS mid
 653                       FROM (
 654                            SELECT mr1.useridto AS userid, MAX(mr1.id) AS mid
 655                              FROM {message_read} mr1
 656                             WHERE mr1.useridfrom = :userid1
 657                                   AND mr1.notification = 0
 658                          GROUP BY mr1.useridto
 659                                   UNION
 660                            SELECT mr2.useridfrom AS userid, MAX(mr2.id) AS mid
 661                              FROM {message_read} mr2
 662                             WHERE mr2.useridto = :userid2
 663                                   AND mr2.notification = 0
 664                          GROUP BY mr2.useridfrom
 665                            ) messages
 666                   GROUP BY messages.userid
 667                    ) messages2 ON mr.id = messages2.mid AND (mr.useridto = messages2.userid OR mr.useridfrom = messages2.userid)
 668               JOIN {user} u ON u.id = messages2.userid
 669          LEFT JOIN {message_contacts} mc ON mc.userid = :userid3 AND mc.contactid = u.id
 670              WHERE u.deleted = '0'
 671           ORDER BY mr.id DESC";
 672     $params = array('userid1' => $user->id, 'userid2' => $user->id, 'userid3' => $user->id);
 673     $read =  $DB->get_records_sql($sql, $params, $limitfrom, $limitto);
 674
 675     $sql = "SELECT $userfields, m.id as mid, m.smallmessage, m.fullmessage, m.timecreated, mc.id as contactlistid, mc.blocked
 676               FROM {message} m
 677               JOIN (
 678                     SELECT messages.userid AS userid, MAX(messages.mid) AS mid
 679                       FROM (
 680                            SELECT m1.useridto AS userid, MAX(m1.id) AS mid
 681                              FROM {message} m1
 682                             WHERE m1.useridfrom = :userid1
 683                                   AND m1.notification = 0
 684                          GROUP BY m1.useridto
 685                                   UNION
 686                            SELECT m2.useridfrom AS userid, MAX(m2.id) AS mid
 687                              FROM {message} m2
 688                             WHERE m2.useridto = :userid2
 689                                   AND m2.notification = 0
 690                          GROUP BY m2.useridfrom
 691                            ) messages
 692                   GROUP BY messages.userid
 693                    ) messages2 ON m.id = messages2.mid AND (m.useridto = messages2.userid OR m.useridfrom = messages2.userid)
 694               JOIN {user} u ON u.id = messages2.userid
 695          LEFT JOIN {message_contacts} mc ON mc.userid = :userid3 AND mc.contactid = u.id
 696              WHERE u.deleted = '0'
 697              ORDER BY m.id DESC";
 698     $unread =  $DB->get_records_sql($sql, $params, $limitfrom, $limitto);
 699
 700     $conversations = array();
 701
 702     //Union the 2 result sets together looking for the message with the most recent timecreated for each other user
 703     //$conversation->id (the array key) is the other user's ID
 704     $conversation_arrays = array($unread, $read);
 705     foreach ($conversation_arrays as $conversation_array) {
 706         foreach ($conversation_array as $conversation) {
 707             if (empty($conversations[$conversation->id]) || $conversations[$conversation->id]->timecreated < $conversation->timecreated ) {
 708                 $conversations[$conversation->id] = $conversation;
 709             }
 710         }
 711     }
 712
 713     //Sort the conversations. This is a bit complicated as we need to sort by $conversation->timecreated
 714     //and there may be multiple conversations with the same timecreated value.
 715     //The conversations array contains both read and unread messages (different tables) so sorting by ID won't work
 716     usort($conversations, "conversationsort");
 717
 718     return $conversations;
 719 }
 720
 721 /**
 722  * Sort function used to order conversations
 723  * @param object $a A conversation object
 724  * @param object $b A conversation object
 725  * @return integer
 726  */
 727 function conversationsort($a, $b)
 728 {
 729     if ($a->timecreated == $b->timecreated) {
 730         return 0;
 731     }
 732     return ($a->timecreated > $b->timecreated) ? -1 : 1;
 733 }
 734
 735 /**
 736  * Get the users recent event notifications
 737  * @param object $user the current user
 738  * @param int $limitfrom can be used for paging
 739  * @param int $limitto can be used for paging
 740  * @return array
 741  */
 742 function message_get_recent_notifications($user, $limitfrom=0, $limitto=100) {
 743     global $DB;
 744
 745     $userfields = user_picture::fields('u', array('lastaccess'));
 746     $sql = "SELECT mr.id AS message_read_id, $userfields, mr.smallmessage, mr.fullmessage, mr.timecreated as timecreated, mr.contexturl, mr.contexturlname
 747               FROM {message_read} mr
 748                    JOIN {user} u ON u.id=mr.useridfrom
 749              WHERE mr.useridto = :userid1 AND u.deleted = '0' AND mr.notification = :notification
 750              ORDER BY mr.id DESC";//ordering by id should give the same result as ordering by timecreated but will be faster
 751     $params = array('userid1' => $user->id, 'notification' => 1);
 752
 753     $notifications =  $DB->get_records_sql($sql, $params, $limitfrom, $limitto);
 754     return $notifications;
 755 }
 756
 757 /**
 758  * Print the user's recent conversations
 759  * @param object $user1 the current user
 760  * @param bool $showicontext flag indicating whether or not to show text next to the action icons
 761  */
 762 function message_print_recent_conversations($user=null, $showicontext=false) {
 763     global $USER;
 764
 765     echo html_writer::start_tag('p', array('class' => 'heading'));
 766     echo get_string('mostrecentconversations', 'message');
 767     echo html_writer::end_tag('p');
 768
 769     if (empty($user)) {
 770         $user = $USER;
 771     }
 772
 773     $conversations = message_get_recent_conversations($user);
 774
 775     $showotheruser = true;
 776     message_print_recent_messages_table($conversations, $user, $showotheruser, $showicontext);
 777 }
 778
 779 /**
 780  * Print the user's recent notifications
 781  * @param object $user1 the current user
 782  */
 783 function message_print_recent_notifications($user=null) {
 784     global $USER;
 785
 786     echo html_writer::start_tag('p', array('class' => 'heading'));
 787     echo get_string('mostrecentnotifications', 'message');
 788     echo html_writer::end_tag('p');
 789
 790     if (empty($user)) {
 791         $user = $USER;
 792     }
 793
 794     $notifications = message_get_recent_notifications($user);
 795
 796     $showicontext = false;
 797     $showotheruser = false;
 798     message_print_recent_messages_table($notifications, $user, $showotheruser, $showicontext);
 799 }
 800
 801 /**
 802  * Print a list of recent messages
 803  * @staticvar type $dateformat
 804  * @param array $messages the messages to display
 805  * @param object $user the current user
 806  * @param bool $showotheruser display information on the other user?
 807  * @param bool $showicontext show text next to the action icons?
 808  */
 809 function message_print_recent_messages_table($messages, $user=null, $showotheruser=true, $showicontext=false) {
 810     global $OUTPUT;
 811     static $dateformat;
 812
 813     if (empty($dateformat)) {
 814         $dateformat = get_string('strftimedatetimeshort');
 815     }
 816
 817     echo html_writer::start_tag('div', array('class' => 'messagerecent'));
 818     foreach ($messages as $message) {
 819         echo html_writer::start_tag('div', array('class' => 'singlemessage'));
 820
 821         if ($showotheruser) {
 822             if ( $message->contactlistid )  {
 823                 if ($message->blocked == 0) { /// not blocked
 824                     $strcontact = message_contact_link($message->id, 'remove', true, null, $showicontext);
 825                     $strblock   = message_contact_link($message->id, 'block', true, null, $showicontext);
 826                 } else { // blocked
 827                     $strcontact = message_contact_link($message->id, 'add', true, null, $showicontext);
 828                     $strblock   = message_contact_link($message->id, 'unblock', true, null, $showicontext);
 829                 }
 830             } else {
 831                 $strcontact = message_contact_link($message->id, 'add', true, null, $showicontext);
 832                 $strblock   = message_contact_link($message->id, 'block', true, null, $showicontext);
 833             }
 834
 835             //should we show just the icon or icon and text?
 836             $histicontext = 'icon';
 837             if ($showicontext) {
 838                 $histicontext = 'both';
 839             }
 840             $strhistory = message_history_link($user->id, $message->id, true, '', '', $histicontext);
 841
 842             echo html_writer::start_tag('span', array('class' => 'otheruser'));
 843
 844             echo html_writer::start_tag('span', array('class' => 'pix'));
 845             echo $OUTPUT->user_picture($message, array('size' => 20, 'courseid' => SITEID));
 846             echo html_writer::end_tag('span');
 847
 848             echo html_writer::start_tag('span', array('class' => 'contact'));
 849
 850             $link = new moodle_url("/message/index.php?id=$message->id");
 851             $action = null;
 852             echo $OUTPUT->action_link($link, fullname($message), $action, array('title' => get_string('sendmessageto', 'message', fullname($message))));
 853
 854             echo html_writer::end_tag('span');//end contact
 855
 856             echo $strcontact.$strblock.$strhistory;
 857             echo html_writer::end_tag('span');//end otheruser
 858         }
 859         $messagetoprint = null;
 860         if (!empty($message->smallmessage)) {
 861             $messagetoprint = $message->smallmessage;
 862         } else {
 863             $messagetoprint = $message->fullmessage;
 864         }
 865
 866         echo html_writer::tag('span', userdate($message->timecreated, $dateformat), array('class' => 'messagedate'));
 867         echo html_writer::tag('span', format_text($messagetoprint, FORMAT_HTML), array('class' => 'themessage'));
 868         echo message_format_contexturl($message);
 869         echo html_writer::end_tag('div');//end singlemessage
 870     }
 871     echo html_writer::end_tag('div');//end messagerecent
 872 }
 873
 874 /**
 875  * Add the selected user as a contact for the current user
 876  * @param int $contactid the ID of the user to add as a contact
 877  * @param int $blocked 1 if you wish to block the contact
 878  * @return bool/int false if the $contactid isnt a valid user id. True if no changes made.
 879  *                  Otherwise returns the result of update_record() or insert_record()
 880  */
 881 function message_add_contact($contactid, $blocked=0) {
 882     global $USER, $DB;
 883
 884     if (!$DB->record_exists('user', array('id' => $contactid))) { // invalid userid
 885         return false;
 886     }
 887
 888     if (($contact = $DB->get_record('message_contacts', array('userid' => $USER->id, 'contactid' => $contactid))) !== false) {
 889     /// record already exists - we may be changing blocking status
 890
 891         if ($contact->blocked !== $blocked) {
 892         /// change to blocking status
 893             $contact->blocked = $blocked;
 894             return $DB->update_record('message_contacts', $contact);
 895         } else {
 896         /// no changes to blocking status
 897             return true;
 898         }
 899
 900     } else {
 901     /// new contact record
 902         unset($contact);
 903         $contact->userid = $USER->id;
 904         $contact->contactid = $contactid;
 905         $contact->blocked = $blocked;
 906         return $DB->insert_record('message_contacts', $contact, false);
 907     }
 908 }
 909
 910 /**
 911  * remove a contact
 912  * @param type $contactid the user ID of the contact to remove
 913  * @return bool returns the result of delete_records()
 914  */
 915 function message_remove_contact($contactid) {
 916     global $USER, $DB;
 917     return $DB->delete_records('message_contacts', array('userid' => $USER->id, 'contactid' => $contactid));
 918 }
 919
 920 /**
 921  * Unblock a contact. Note that this reverts the previously blocked user back to a non-contact.
 922  * @param int $contactid the user ID of the contact to unblock
 923  * @return bool returns the result of delete_records()
 924  */
 925 function message_unblock_contact($contactid) {
 926     global $USER, $DB;
 927     return $DB->delete_records('message_contacts', array('userid' => $USER->id, 'contactid' => $contactid));
 928 }
 929
 930 /**
 931  * block a user
 932  * @param int $contactid the user ID of the user to block
 933  */
 934 function message_block_contact($contactid) {
 935     return message_add_contact($contactid, 1);
 936 }
 937
 938 /**
 939  * Load a user's contact record
 940  * @param int $contactid the user ID of the user whose contact record you want
 941  */
 942 function message_get_contact($contactid) {
 943     global $USER, $DB;
 944     return $DB->get_record('message_contacts', array('userid' => $USER->id, 'contactid' => $contactid));
 945 }
 946
 947 /**
 948  * Print the results of a message search
 949  * @param mixed $frm submitted form data
 950  * @param bool $showicontext show text next to action icons?
 951  * @param object $user1 the current user
 952  */
 953 function message_print_search_results($frm, $showicontext=false, $user1=null) {
 954     global $USER, $DB, $OUTPUT;
 955
 956     if (empty($user1)) {
 957         $user1 = $USER;
 958     }
 959
 960     echo html_writer::start_tag('div', array('class' => 'mdl-left'));
 961
 962     $personsearch = false;
 963     $personsearchstring = null;
 964     if (!empty($frm->personsubmit) and !empty($frm->name)) {
 965         $personsearch = true;
 966         $personsearchstring = $frm->name;
 967     } else if (!empty($frm->combinedsubmit) and !empty($frm->combinedsearch)) {
 968         $personsearch = true;
 969         $personsearchstring = $frm->combinedsearch;
 970     }
 971
 972     /// search for person
 973     if ($personsearch) {
 974         if (optional_param('mycourses', 0, PARAM_BOOL)) {
 975             $users = array();
 976             $mycourses = enrol_get_my_courses();
 977             foreach ($mycourses as $mycourse) {
 978                 if (is_array($susers = message_search_users($mycourse->id, $personsearchstring))) {
 979                     foreach ($susers as $suser) $users[$suser->id] = $suser;
 980                 }
 981             }
 982         } else {
 983             $users = message_search_users(SITEID, $personsearchstring);
 984         }
 985
 986         if (!empty($users)) {
 987             echo html_writer::start_tag('p', array('class' => 'heading searchresultcount'));
 988             echo get_string('userssearchresults', 'message', count($users));
 989             echo html_writer::end_tag('p');
 990
 991             echo html_writer::start_tag('table', array('class' => 'messagesearchresults'));
 992             foreach ($users as $user) {
 993
 994                 if ( $user->contactlistid )  {
 995                     if ($user->blocked == 0) { /// not blocked
 996                         $strcontact = message_contact_link($user->id, 'remove', true, null, $showicontext);
 997                         $strblock   = message_contact_link($user->id, 'block', true, null, $showicontext);
 998                     } else { // blocked
 999                         $strcontact = message_contact_link($user->id, 'add', true, null, $showicontext);
1000                         $strblock   = message_contact_link($user->id, 'unblock', true, null, $showicontext);
1001                     }
1002                 } else {
1003                     $strcontact = message_contact_link($user->id, 'add', true, null, $showicontext);
1004                     $strblock   = message_contact_link($user->id, 'block', true, null, $showicontext);
1005                 }
1006
1007                 //should we show just the icon or icon and text?
1008                 $histicontext = 'icon';
1009                 if ($showicontext) {
1010                     $histicontext = 'both';
1011                 }
1012                 $strhistory = message_history_link($USER->id, $user->id, true, '', '', $histicontext);
1013
1014                 echo html_writer::start_tag('tr');
1015
1016                 echo html_writer::start_tag('td', array('class' => 'pix'));
1017                 echo $OUTPUT->user_picture($user, array('size' => 20, 'courseid' => SITEID));
1018                 echo html_writer::end_tag('td');
1019
1020                 echo html_writer::start_tag('td',array('class' => 'contact'));
1021                 $action = null;
1022                 $link = new moodle_url("/message/index.php?id=$user->id");
1023                 echo $OUTPUT->action_link($link, fullname($user), $action, array('title' => get_string('sendmessageto', 'message', fullname($user))));
1024                 echo html_writer::end_tag('td');
1025
1026                 echo html_writer::tag('td', $strcontact, array('class' => 'link'));
1027                 echo html_writer::tag('td', $strblock, array('class' => 'link'));
1028                 echo html_writer::tag('td', $strhistory, array('class' => 'link'));
1029
1030                 echo html_writer::end_tag('tr');
1031             }
1032             echo html_writer::end_tag('table');
1033
1034         } else {
1035             echo html_writer::start_tag('p', array('class' => 'heading searchresultcount'));
1036             echo get_string('userssearchresults', 'message', 0).'<br /><br />';
1037             echo html_writer::end_tag('p');
1038         }
1039     }
1040
1041     // search messages for keywords
1042     $messagesearch = false;
1043     $messagesearchstring = null;
1044     if (!empty($frm->keywords)) {
1045         $messagesearch = true;
1046         $messagesearchstring = clean_text(trim($frm->keywords));
1047     } else if (!empty($frm->combinedsubmit) and !empty($frm->combinedsearch)) {
1048         $messagesearch = true;
1049         $messagesearchstring = clean_text(trim($frm->combinedsearch));
1050     }
1051
1052     if ($messagesearch) {
1053         if ($messagesearchstring) {
1054             $keywords = explode(' ', $messagesearchstring);
1055         } else {
1056             $keywords = array();
1057         }
1058         $tome     = false;
1059         $fromme   = false;
1060         $courseid = 'none';
1061
1062         if (empty($frm->keywordsoption)) {
1063             $frm->keywordsoption = 'allmine';
1064         }
1065
1066         switch ($frm->keywordsoption) {
1067             case 'tome':
1068                 $tome   = true;
1069                 break;
1070             case 'fromme':
1071                 $fromme = true;
1072                 break;
1073             case 'allmine':
1074                 $tome   = true;
1075                 $fromme = true;
1076                 break;
1077             case 'allusers':
1078                 $courseid = SITEID;
1079                 break;
1080             case 'courseusers':
1081                 $courseid = $frm->courseid;
1082                 break;
1083             default:
1084                 $tome   = true;
1085                 $fromme = true;
1086         }
1087
1088         if (($messages = message_search($keywords, $fromme, $tome, $courseid)) !== false) {
1089
1090         /// get a list of contacts
1091             if (($contacts = $DB->get_records('message_contacts', array('userid' => $USER->id), '', 'contactid, blocked') ) === false) {
1092                 $contacts = array();
1093             }
1094
1095         /// print heading with number of results
1096             echo html_writer::start_tag('p', array('class' => 'heading searchresultcount'));
1097             $countresults = count($messages);
1098             if ($countresults == MESSAGE_SEARCH_MAX_RESULTS) {
1099                 echo get_string('keywordssearchresultstoomany', 'message', $countresults).' ("'.s($messagesearchstring).'")';
1100             } else {
1101                 echo get_string('keywordssearchresults', 'message', $countresults);
1102             }
1103             echo html_writer::end_tag('p');
1104
1105         /// print table headings
1106             echo html_writer::start_tag('table', array('class' => 'messagesearchresults', 'cellspacing' => '0'));
1107
1108             $headertdstart = html_writer::start_tag('td', array('class' => 'messagesearchresultscol'));
1109             $headertdend   = html_writer::end_tag('td');
1110             echo html_writer::start_tag('tr');
1111             echo $headertdstart.get_string('from').$headertdend;
1112             echo $headertdstart.get_string('to').$headertdend;
1113             echo $headertdstart.get_string('message', 'message').$headertdend;
1114             echo $headertdstart.get_string('timesent', 'message').$headertdend;
1115             echo html_writer::end_tag('tr');
1116
1117             $blockedcount = 0;
1118             $dateformat = get_string('strftimedatetimeshort');
1119             $strcontext = get_string('context', 'message');
1120             foreach ($messages as $message) {
1121
1122             /// ignore messages to and from blocked users unless $frm->includeblocked is set
1123                 if (!optional_param('includeblocked', 0, PARAM_BOOL) and (
1124                       ( isset($contacts[$message->useridfrom]) and ($contacts[$message->useridfrom]->blocked == 1)) or
1125                       ( isset($contacts[$message->useridto]  ) and ($contacts[$message->useridto]->blocked   == 1))
1126                                                 )
1127                    ) {
1128                     $blockedcount ++;
1129                     continue;
1130                 }
1131
1132             /// load up user to record
1133                 if ($message->useridto !== $USER->id) {
1134                     $userto = $DB->get_record('user', array('id' => $message->useridto));
1135                     $tocontact = (array_key_exists($message->useridto, $contacts) and
1136                                     ($contacts[$message->useridto]->blocked == 0) );
1137                     $toblocked = (array_key_exists($message->useridto, $contacts) and
1138                                     ($contacts[$message->useridto]->blocked == 1) );
1139                 } else {
1140                     $userto = false;
1141                     $tocontact = false;
1142                     $toblocked = false;
1143                 }
1144
1145             /// load up user from record
1146                 if ($message->useridfrom !== $USER->id) {
1147                     $userfrom = $DB->get_record('user', array('id' => $message->useridfrom));
1148                     $fromcontact = (array_key_exists($message->useridfrom, $contacts) and
1149                                     ($contacts[$message->useridfrom]->blocked == 0) );
1150                     $fromblocked = (array_key_exists($message->useridfrom, $contacts) and
1151                                     ($contacts[$message->useridfrom]->blocked == 1) );
1152                 } else {
1153                     $userfrom = false;
1154                     $fromcontact = false;
1155                     $fromblocked = false;
1156                 }
1157
1158             /// find date string for this message
1159                 $date = usergetdate($message->timecreated);
1160                 $datestring = $date['year'].$date['mon'].$date['mday'];
1161
1162             /// print out message row
1163                 echo html_writer::start_tag('tr', array('valign' => 'top'));
1164
1165                 echo html_writer::start_tag('td', array('class' => 'contact'));
1166                 message_print_user($userfrom, $fromcontact, $fromblocked, $showicontext);
1167                 echo html_writer::end_tag('td');
1168
1169                 echo html_writer::start_tag('td', array('class' => 'contact'));
1170                 message_print_user($userto, $tocontact, $toblocked, $showicontext);
1171                 echo html_writer::end_tag('td');
1172
1173                 echo html_writer::start_tag('td', array('class' => 'summary'));
1174                 echo message_get_fragment($message->fullmessage, $keywords);
1175                 echo html_writer::start_tag('div', array('class' => 'link'));
1176
1177                 //find the user involved that isn't the current user
1178                 $user2id = null;
1179                 if ($user1->id == $message->useridto) {
1180                     $user2id = $message->useridfrom;
1181                 } else {
1182                     $user2id = $message->useridto;
1183                 }
1184                 message_history_link($user1->id, $user2id, false,
1185                                      $messagesearchstring, 'm'.$message->id, $strcontext);
1186                 echo html_writer::end_tag('div');
1187                 echo html_writer::end_tag('td');
1188
1189                 echo html_writer::tag('td', userdate($message->timecreated, $dateformat), array('class' => 'date'));
1190
1191                 echo html_writer::end_tag('tr');
1192             }
1193
1194
1195             if ($blockedcount > 0) {
1196                 echo html_writer::start_tag('tr');
1197                 echo html_writer::tag('td', get_string('blockedmessages', 'message', $blockedcount), array('colspan' => 4, 'align' => 'center'));
1198                 echo html_writer::end_tag('tr');
1199             }
1200             echo html_writer::end_tag('table');
1201
1202         } else {
1203             echo html_writer::tag('p', get_string('keywordssearchresults', 'message', 0), array('class' => 'heading'));
1204         }
1205     }
1206
1207     if (!$personsearch && !$messagesearch) {
1208         //they didn't enter any search terms
1209         echo $OUTPUT->notification(get_string('emptysearchstring', 'message'));
1210     }
1211
1212     echo html_writer::end_tag('div');
1213 }
1214
1215 /**
1216  * Print information on a user. Used when printing search results.
1217  * @param object/bool $user the user to display or false if you just want $USER
1218  * @param bool $iscontact is the user being displayed a contact?
1219  * @param bool $isblocked is the user being displayed blocked?
1220  * @param bool $includeicontext include text next to the action icons?
1221  */
1222 function message_print_user ($user=false, $iscontact=false, $isblocked=false, $includeicontext=false) {
1223     global $USER, $OUTPUT;
1224
1225     if ($user === false) {
1226         echo $OUTPUT->user_picture($USER, array('size' => 20, 'courseid' => SITEID));
1227     } else {
1228         echo $OUTPUT->user_picture($user, array('size' => 20, 'courseid' => SITEID));
1229         echo '&nbsp;';
1230
1231         $return = false;
1232         $script = null;
1233         if ($iscontact) {
1234             message_contact_link($user->id, 'remove', $return, $script, $includeicontext);
1235         } else {
1236             message_contact_link($user->id, 'add', $return, $script, $includeicontext);
1237         }
1238         echo '&nbsp;';
1239         if ($isblocked) {
1240             message_contact_link($user->id, 'unblock', $return, $script, $includeicontext);
1241         } else {
1242             message_contact_link($user->id, 'block', $return, $script, $includeicontext);
1243         }
1244
1245         $popupoptions = array(
1246                 'height' => MESSAGE_DISCUSSION_HEIGHT,
1247                 'width' => MESSAGE_DISCUSSION_WIDTH,
1248                 'menubar' => false,
1249                 'location' => false,
1250                 'status' => true,
1251                 'scrollbars' => true,
1252                 'resizable' => true);
1253
1254         $link = new moodle_url("/message/index.php?id=$user->id");
1255         //$action = new popup_action('click', $link, "message_$user->id", $popupoptions);
1256         $action = null;
1257         echo $OUTPUT->action_link($link, fullname($user), $action, array('title' => get_string('sendmessageto', 'message', fullname($user))));
1258
1259     }
1260 }
1261
1262 /**
1263  * Print a message contact link
1264  * @staticvar type $str
1265  * @param int $userid the ID of the user to apply to action to
1266  * @param string $linktype can be add, remove, block or unblock
1267  * @param bool $return if true return the link as a string. If false echo the link.
1268  * @param string $script the URL to send the user to when the link is clicked. If null, the current page.
1269  * @param bool $text include text next to the icons?
1270  * @param bool $icon include a graphical icon?
1271  * @return string  if $return is true otherwise bool
1272  */
1273 function message_contact_link($userid, $linktype='add', $return=false, $script=null, $text=false, $icon=true) {
1274     global $OUTPUT, $PAGE;
1275
1276     //hold onto the strings as we're probably creating a bunch of links
1277     static $str;
1278
1279     if (empty($script)) {
1280         //strip off previous action params like 'removecontact'
1281         $script = message_remove_url_params($PAGE->url);
1282     }
1283
1284     if (empty($str->blockcontact)) {
1285        $str->blockcontact   =  get_string('blockcontact', 'message');
1286        $str->unblockcontact =  get_string('unblockcontact', 'message');
1287        $str->removecontact  =  get_string('removecontact', 'message');
1288        $str->addcontact     =  get_string('addcontact', 'message');
1289     }
1290
1291     $command = $linktype.'contact';
1292     $string  = $str->{$command};
1293
1294     $safealttext = s($string);
1295
1296     $safestring = '';
1297     if (!empty($text)) {
1298         $safestring = $safealttext;
1299     }
1300
1301     $img = '';
1302     if ($icon) {
1303         $iconpath = null;
1304         switch ($linktype) {
1305             case 'block':
1306                 $iconpath = 't/block';
1307                 break;
1308             case 'unblock':
1309                 $iconpath = 't/userblue';
1310                 break;
1311             case 'remove':
1312                 $iconpath = 'i/cross_red_big';
1313                 break;
1314             case 'add':
1315             default:
1316                 $iconpath = 't/addgreen';
1317         }
1318
1319         $img = '<img src="'.$OUTPUT->pix_url($iconpath).'" class="iconsmall" alt="'.$safealttext.'" />';
1320     }
1321
1322     $output = '<span class="'.$linktype.'contact">'.
1323               '<a href="'.$script.'&amp;'.$command.'='.$userid.
1324               '&amp;sesskey='.sesskey().'" title="'.$safealttext.'">'.
1325               $img.
1326               $safestring.'</a></span>';
1327
1328     if ($return) {
1329         return $output;
1330     } else {
1331         echo $output;
1332         return true;
1333     }
1334 }
1335
1336 /**
1337  * echo or return a link to take the user to the full message history between themselves and another user
1338  * @staticvar type $strmessagehistory
1339  * @param int $userid1 the ID of the current user
1340  * @param int $userid2 the ID of the other user
1341  * @param bool $return true to return the link as a string. False to echo the link.
1342  * @param string $keywords any keywords to highlight in the message history
1343  * @param string $position anchor name to jump to within the message history
1344  * @param string $linktext optionally specify the link text
1345  * @return string|bool. Returns a string if $return is true. Otherwise returns a boolean.
1346  */
1347 function message_history_link($userid1, $userid2, $return=false, $keywords='', $position='', $linktext='') {
1348     global $OUTPUT;
1349
1350     static $strmessagehistory;
1351
1352     if (empty($strmessagehistory)) {
1353         $strmessagehistory = get_string('messagehistory', 'message');
1354     }
1355
1356     if ($position) {
1357         $position = "#$position";
1358     }
1359     if ($keywords) {
1360         $keywords = "&search=".urlencode($keywords);
1361     }
1362
1363     if ($linktext == 'icon') {  // Icon only
1364         $fulllink = '<img src="'.$OUTPUT->pix_url('t/log') . '" class="iconsmall" alt="'.$strmessagehistory.'" />';
1365     } else if ($linktext == 'both') {  // Icon and standard name
1366         $fulllink = '<img src="'.$OUTPUT->pix_url('t/log') . '" class="iconsmall" alt="" />';
1367         $fulllink .= '&nbsp;'.$strmessagehistory;
1368     } else if ($linktext) {    // Custom name
1369         $fulllink = $linktext;
1370     } else {                   // Standard name only
1371         $fulllink = $strmessagehistory;
1372     }
1373
1374     $popupoptions = array(
1375             'height' => 500,
1376             'width' => 500,
1377             'menubar' => false,
1378             'location' => false,
1379             'status' => true,
1380             'scrollbars' => true,
1381             'resizable' => true);
1382
1383     $link = new moodle_url('/message/index.php?history='.MESSAGE_HISTORY_ALL."&user=$userid1&id=$userid2$keywords$position");
1384     $action = null;
1385     $str = $OUTPUT->action_link($link, $fulllink, $action, array('title' => $strmessagehistory));
1386
1387     $str = '<span class="history">'.$str.'</span>';
1388
1389     if ($return) {
1390         return $str;
1391     } else {
1392         echo $str;
1393         return true;
1394     }
1395 }
1396
1397
1398 /**
1399  * Search through course users
1400  *
1401  * If $coursid specifies the site course then this function searches
1402  * through all undeleted and confirmed users
1403  * @param int $courseid The course in question.
1404  * @param string $searchtext the text to search for
1405  * @param string $sort the column name to order by
1406  * @param string $exceptions comma separated list of user IDs to exclude
1407  * @return array  An array of {@link $USER} records.
1408  */
1409 function message_search_users($courseid, $searchtext, $sort='', $exceptions='') {
1410     global $CFG, $USER, $DB;
1411
1412     $fullname = $DB->sql_fullname();
1413
1414     if (!empty($exceptions)) {
1415         $except = ' AND u.id NOT IN ('. $exceptions .') ';
1416     } else {
1417         $except = '';
1418     }
1419
1420     if (!empty($sort)) {
1421         $order = ' ORDER BY '. $sort;
1422     } else {
1423         $order = '';
1424     }
1425
1426     $ufields = user_picture::fields('u');
1427     if (!$courseid or $courseid == SITEID) {
1428         $params = array($USER->id, "%$searchtext%");
1429         return $DB->get_records_sql("SELECT $ufields, mc.id as contactlistid, mc.blocked
1430                                        FROM {user} u
1431                                        LEFT JOIN {message_contacts} mc
1432                                             ON mc.contactid = u.id AND mc.userid = ?
1433                                       WHERE u.deleted = '0' AND u.confirmed = '1'
1434                                             AND (".$DB->sql_like($fullname, '?', false).")
1435                                             $except
1436                                      $order", $params);
1437     } else {
1438 //TODO: add enabled enrolment join here (skodak)
1439         $context = get_context_instance(CONTEXT_COURSE, $courseid);
1440         $contextlists = get_related_contexts_string($context);
1441
1442         // everyone who has a role assignment in this course or higher
1443         $params = array($USER->id, "%$searchtext%");
1444         $users = $DB->get_records_sql("SELECT $ufields, mc.id as contactlistid, mc.blocked
1445                                          FROM {user} u
1446                                          JOIN {role_assignments} ra ON ra.userid = u.id
1447                                          LEFT JOIN {message_contacts} mc
1448                                               ON mc.contactid = u.id AND mc.userid = ?
1449                                         WHERE u.deleted = '0' AND u.confirmed = '1'
1450                                               AND ra.contextid $contextlists
1451                                               AND (".$DB->sql_like($fullname, '?', false).")
1452                                               $except
1453                                        $order", $params);
1454
1455         return $users;
1456     }
1457 }
1458
1459 /**
1460  * search a user's messages
1461  * @param array $searchterms an array of search terms (strings)
1462  * @param bool $fromme include messages from the user?
1463  * @param bool $tome include messages to the user?
1464  * @param mixed $courseid SITEID for admins searching all messages. Other behaviour not yet implemented
1465  * @param int $userid the user ID of the current user
1466  * @return mixed An array of messages or false if no matching messages were found
1467  */
1468 function message_search($searchterms, $fromme=true, $tome=true, $courseid='none', $userid=0) {
1469 /// Returns a list of posts found using an array of search terms
1470 /// eg   word  +word -word
1471 ///
1472     global $CFG, $USER, $DB;
1473
1474     /// If no userid sent then assume current user
1475     if ($userid == 0) $userid = $USER->id;
1476
1477     /// Some differences in SQL syntax
1478     if ($DB->sql_regex_supported()) {
1479         $REGEXP    = $DB->sql_regex(true);
1480         $NOTREGEXP = $DB->sql_regex(false);
1481     }
1482
1483     $searchcond = array();
1484     $params = array();
1485     $i = 0;
1486
1487     //preprocess search terms to check whether we have at least 1 eligible search term
1488     //if we do we can drop words around it like 'a'
1489     $dropshortwords = false;
1490     foreach ($searchterms as $searchterm) {
1491         if (strlen($searchterm) >= 2) {
1492             $dropshortwords = true;
1493         }
1494     }
1495
1496     foreach ($searchterms as $searchterm) {
1497         $i++;
1498
1499         $NOT = false; /// Initially we aren't going to perform NOT LIKE searches, only MSSQL and Oracle
1500
1501         if ($dropshortwords && strlen($searchterm) < 2) {
1502             continue;
1503         }
1504     /// Under Oracle and MSSQL, trim the + and - operators and perform
1505     /// simpler LIKE search
1506         if (!$DB->sql_regex_supported()) {
1507             if (substr($searchterm, 0, 1) == '-') {
1508                 $NOT = true;
1509             }
1510             $searchterm = trim($searchterm, '+-');
1511         }
1512
1513         if (substr($searchterm,0,1) == "+") {
1514             $searchterm = substr($searchterm,1);
1515             $searchterm = preg_quote($searchterm, '|');
1516             $searchcond[] = "m.fullmessage $REGEXP :ss$i";
1517             $params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
1518
1519         } else if (substr($searchterm,0,1) == "-") {
1520             $searchterm = substr($searchterm,1);
1521             $searchterm = preg_quote($searchterm, '|');
1522             $searchcond[] = "m.fullmessage $NOTREGEXP :ss$i";
1523             $params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
1524
1525         } else {
1526             $searchcond[] = $DB->sql_like("m.fullmessage", ":ss$i", false, true, $NOT);
1527             $params['ss'.$i] = "%$searchterm%";
1528         }
1529     }
1530
1531     if (empty($searchcond)) {
1532         $searchcond = " ".$DB->sql_like('m.fullmessage', ':ss1', false);
1533         $params['ss1'] = "%";
1534     } else {
1535         $searchcond = implode(" AND ", $searchcond);
1536     }
1537
1538     /// There are several possibilities
1539     /// 1. courseid = SITEID : The admin is searching messages by all users
1540     /// 2. courseid = ??     : A teacher is searching messages by users in
1541     ///                        one of their courses - currently disabled
1542     /// 3. courseid = none   : User is searching their own messages;
1543     ///    a.  Messages from user
1544     ///    b.  Messages to user
1545     ///    c.  Messages to and from user
1546
1547     if ($courseid == SITEID) { /// admin is searching all messages
1548         $m_read   = $DB->get_records_sql("SELECT m.id, m.useridto, m.useridfrom, m.fullmessage, m.timecreated
1549                                             FROM {message_read} m
1550                                            WHERE $searchcond", $params, 0, MESSAGE_SEARCH_MAX_RESULTS);
1551         $m_unread = $DB->get_records_sql("SELECT m.id, m.useridto, m.useridfrom, m.fullmessage, m.timecreated
1552                                             FROM {message} m
1553                                            WHERE $searchcond", $params, 0, MESSAGE_SEARCH_MAX_RESULTS);
1554
1555     } else if ($courseid !== 'none') {
1556         /// This has not been implemented due to security concerns
1557         $m_read   = array();
1558         $m_unread = array();
1559
1560     } else {
1561
1562         if ($fromme and $tome) {
1563             $searchcond .= " AND (m.useridfrom=:userid1 OR m.useridto=:userid2)";
1564             $params['userid1'] = $userid;
1565             $params['userid2'] = $userid;
1566
1567         } else if ($fromme) {
1568             $searchcond .= " AND m.useridfrom=:userid";
1569             $params['userid'] = $userid;
1570
1571         } else if ($tome) {
1572             $searchcond .= " AND m.useridto=:userid";
1573             $params['userid'] = $userid;
1574         }
1575
1576         $m_read   = $DB->get_records_sql("SELECT m.id, m.useridto, m.useridfrom, m.fullmessage, m.timecreated
1577                                             FROM {message_read} m
1578                                            WHERE $searchcond", $params, 0, MESSAGE_SEARCH_MAX_RESULTS);
1579         $m_unread = $DB->get_records_sql("SELECT m.id, m.useridto, m.useridfrom, m.fullmessage, m.timecreated
1580                                             FROM {message} m
1581                                            WHERE $searchcond", $params, 0, MESSAGE_SEARCH_MAX_RESULTS);
1582
1583     }
1584
1585     /// The keys may be duplicated in $m_read and $m_unread so we can't
1586     /// do a simple concatenation
1587     $message = array();
1588     foreach ($m_read as $m) {
1589         $messages[] = $m;
1590     }
1591     foreach ($m_unread as $m) {
1592         $messages[] = $m;
1593     }
1594
1595     return (empty($messages)) ? false : $messages;
1596 }
1597
1598 /**
1599  * Given a message object that we already know has a long message
1600  * this function truncates the message nicely to the first
1601  * sane place between $CFG->forum_longpost and $CFG->forum_shortpost
1602  * @param string $message the message
1603  * @param int $minlength the minimum length to trim the message to
1604  * @return string the shortened message
1605  */
1606 function message_shorten_message($message, $minlength = 0) {
1607     $i = 0;
1608     $tag = false;
1609     $length = strlen($message);
1610     $count = 0;
1611     $stopzone = false;
1612     $truncate = 0;
1613     if ($minlength == 0) $minlength = MESSAGE_SHORTLENGTH;
1614
1615
1616     for ($i=0; $i<$length; $i++) {
1617         $char = $message[$i];
1618
1619         switch ($char) {
1620             case "<":
1621                 $tag = true;
1622                 break;
1623             case ">":
1624                 $tag = false;
1625                 break;
1626             default:
1627                 if (!$tag) {
1628                     if ($stopzone) {
1629                         if ($char == '.' or $char == ' ') {
1630                             $truncate = $i+1;
1631                             break 2;
1632                         }
1633                     }
1634                     $count++;
1635                 }
1636                 break;
1637         }
1638         if (!$stopzone) {
1639             if ($count > $minlength) {
1640                 $stopzone = true;
1641             }
1642         }
1643     }
1644
1645     if (!$truncate) {
1646         $truncate = $i;
1647     }
1648
1649     return substr($message, 0, $truncate);
1650 }
1651
1652
1653 /**
1654  * Given a string and an array of keywords, this function looks
1655  * for the first keyword in the string, and then chops out a
1656  * small section from the text that shows that word in context.
1657  * @param string $message the text to search
1658  * @param array $keywords array of keywords to find
1659  */
1660 function message_get_fragment($message, $keywords) {
1661
1662     $fullsize = 160;
1663     $halfsize = (int)($fullsize/2);
1664
1665     $message = strip_tags($message);
1666
1667     foreach ($keywords as $keyword) {  // Just get the first one
1668         if ($keyword !== '') {
1669             break;
1670         }
1671     }
1672     if (empty($keyword)) {   // None found, so just return start of message
1673         return message_shorten_message($message, 30);
1674     }
1675
1676     $leadin = $leadout = '';
1677
1678 /// Find the start of the fragment
1679     $start = 0;
1680     $length = strlen($message);
1681
1682     $pos = strpos($message, $keyword);
1683     if ($pos > $halfsize) {
1684         $start = $pos - $halfsize;
1685         $leadin = '...';
1686     }
1687 /// Find the end of the fragment
1688     $end = $start + $fullsize;
1689     if ($end > $length) {
1690         $end = $length;
1691     } else {
1692         $leadout = '...';
1693     }
1694
1695 /// Pull out the fragment and format it
1696
1697     $fragment = substr($message, $start, $end - $start);
1698     $fragment = $leadin.highlight(implode(' ',$keywords), $fragment).$leadout;
1699     return $fragment;
1700 }
1701
1702 /**
1703  * Retrieve the messages between two users
1704  * @param object $user1 the current user
1705  * @param object $user2 the other user
1706  * @param int $limitnum the maximum number of messages to retrieve
1707  * @param bool $viewingnewmessages are we currently viewing new messages?
1708  */
1709 function message_get_history($user1, $user2, $limitnum=0, $viewingnewmessages=false) {
1710     global $DB, $CFG;
1711
1712     $messages = array();
1713
1714     //we want messages sorted oldest to newest but if getting a subset of messages we need to sort
1715     //desc to get the last $limitnum messages then flip the order in php
1716     $sort = 'asc';
1717     if ($limitnum>0) {
1718         $sort = 'desc';
1719     }
1720
1721     $notificationswhere = null;
1722     //we have just moved new messages to read. If theyre here to see new messages dont hide notifications
1723     if (!$viewingnewmessages && $CFG->messaginghidereadnotifications) {
1724         $notificationswhere = 'AND notification=0';
1725     }
1726
1727     //prevent notifications of your own actions appearing in your own message history
1728     $ownnotificationwhere = ' AND NOT (useridfrom=? AND notification=1)';
1729
1730     if ($messages_read = $DB->get_records_select('message_read', "((useridto = ? AND useridfrom = ?) OR
1731                                                     (useridto = ? AND useridfrom = ?)) $notificationswhere $ownnotificationwhere",
1732                                                     array($user1->id, $user2->id, $user2->id, $user1->id, $user1->id),
1733                                                     "timecreated $sort", '*', 0, $limitnum)) {
1734         foreach ($messages_read as $message) {
1735             $messages[$message->timecreated] = $message;
1736         }
1737     }
1738     if ($messages_new =  $DB->get_records_select('message', "((useridto = ? AND useridfrom = ?) OR
1739                                                     (useridto = ? AND useridfrom = ?)) $ownnotificationwhere",
1740                                                     array($user1->id, $user2->id, $user2->id, $user1->id, $user1->id),
1741                                                     "timecreated $sort", '*', 0, $limitnum)) {
1742         foreach ($messages_new as $message) {
1743             $messages[$message->timecreated] = $message;
1744         }
1745     }
1746
1747     //if we only want the last $limitnum messages
1748     ksort($messages);
1749     $messagecount = count($messages);
1750     if ($limitnum>0 && $messagecount>$limitnum) {
1751         $messages = array_slice($messages, $messagecount-$limitnum, $limitnum, true);
1752     }
1753
1754     return $messages;
1755 }
1756
1757 /**
1758  * Print the message history between two users
1759  * @param object $user1 the current user
1760  * @param object $user2 the other user
1761  * @param string $search search terms to highlight
1762  * @param int $messagelimit maximum number of messages to return
1763  * @param string $messagehistorylink the html for the message history link or false
1764  * @param bool $viewingnewmessages are we currently viewing new messages?
1765  */
1766 function message_print_message_history($user1,$user2,$search='',$messagelimit=0, $messagehistorylink=false, $viewingnewmessages=false) {
1767     global $CFG, $OUTPUT;
1768
1769     echo $OUTPUT->box_start('center');
1770     echo html_writer::start_tag('table', array('cellpadding' => '10', 'class' => 'message_user_pictures'));
1771     echo html_writer::start_tag('tr');
1772
1773     echo html_writer::start_tag('td', array('align' => 'center', 'id' => 'user1'));
1774     echo $OUTPUT->user_picture($user1, array('size' => 100, 'courseid' => SITEID));
1775     echo html_writer::tag('div', fullname($user1), array('class' => 'heading'));
1776     echo html_writer::end_tag('td');
1777
1778     echo html_writer::start_tag('td', array('align' => 'center'));
1779     echo html_writer::empty_tag('img', array('src' => $OUTPUT->pix_url('t/left'), 'alt' => get_string('from')));
1780     echo html_writer::empty_tag('img', array('src' => $OUTPUT->pix_url('t/right'), 'alt' => get_string('to')));
1781     echo html_writer::end_tag('td');
1782
1783     echo html_writer::start_tag('td', array('align' => 'center', 'id' => 'user2'));
1784     echo $OUTPUT->user_picture($user2, array('size' => 100, 'courseid' => SITEID));
1785     echo html_writer::tag('div', fullname($user2), array('class' => 'heading'));
1786
1787     if (isset($user2->iscontact) && isset($user2->isblocked)) {
1788         $incontactlist = $user2->iscontact;
1789         $isblocked = $user2->isblocked;
1790
1791         $script = null;
1792         $text = true;
1793         $icon = false;
1794
1795         $strcontact = message_get_contact_add_remove_link($incontactlist, $isblocked, $user2, $script, $text, $icon);
1796         $strblock   = message_get_contact_block_link($incontactlist, $isblocked, $user2, $script, $text, $icon);
1797         $useractionlinks = $strcontact.'&nbsp;|'.$strblock;
1798
1799         echo html_writer::tag('div', $useractionlinks, array('class' => 'useractionlinks'));
1800     }
1801
1802     echo html_writer::end_tag('td');
1803     echo html_writer::end_tag('tr');
1804     echo html_writer::end_tag('table');
1805     echo $OUTPUT->box_end();
1806
1807     if (!empty($messagehistorylink)) {
1808         echo $messagehistorylink;
1809     }
1810
1811     /// Get all the messages and print them
1812     if ($messages = message_get_history($user1, $user2, $messagelimit, $viewingnewmessages)) {
1813         $tablecontents = '';
1814
1815         $current = new stdClass();
1816         $current->mday = '';
1817         $current->month = '';
1818         $current->year = '';
1819         $messagedate = get_string('strftimetime');
1820         $blockdate   = get_string('strftimedaydate');
1821         foreach ($messages as $message) {
1822             if ($message->notification) {
1823                 $notificationclass = ' notification';
1824             } else {
1825                 $notificationclass = null;
1826             }
1827             $date = usergetdate($message->timecreated);
1828             if ($current->mday != $date['mday'] | $current->month != $date['month'] | $current->year != $date['year']) {
1829                 $current->mday = $date['mday'];
1830                 $current->month = $date['month'];
1831                 $current->year = $date['year'];
1832
1833                 $datestring = html_writer::empty_tag('a', array('name' => $date['year'].$date['mon'].$date['mday']));
1834                 $tablecontents .= html_writer::tag('div', $datestring, array('class' => 'mdl-align heading'));
1835
1836                 $tablecontents .= $OUTPUT->heading(userdate($message->timecreated, $blockdate), 4, 'mdl-align');
1837             }
1838
1839             $formatted_message = $side = null;
1840             if ($message->useridfrom == $user1->id) {
1841                 $formatted_message = message_format_message($message, $messagedate, $search, 'me');
1842                 $side = 'left';
1843             } else {
1844                 $formatted_message = message_format_message($message, $messagedate, $search, 'other');
1845                 $side = 'right';
1846             }
1847             $tablecontents .= html_writer::tag('div', $formatted_message, array('class' => "mdl-left $side $notificationclass"));
1848         }
1849
1850         echo html_writer::nonempty_tag('div', $tablecontents, array('class' => 'mdl-left messagehistory'));
1851     } else {
1852         echo html_writer::nonempty_tag('div', '('.get_string('nomessagesfound', 'message').')', array('class' => 'mdl-align messagehistory'));
1853     }
1854 }
1855
1856 /**
1857  * Format a message for display in the message history
1858  * @param object $message the message object
1859  * @param string $format optional date format
1860  * @param string $keywords keywords to highlight
1861  * @param string $class CSS class to apply to the div around the message
1862  * @return string the formatted message
1863  */
1864 function message_format_message($message, $format='', $keywords='', $class='other') {
1865
1866     static $dateformat;
1867
1868     //if we haven't previously set the date format or they've supplied a new one
1869     if ( empty($dateformat) || (!empty($format) && $dateformat != $format) ) {
1870         if ($format) {
1871             $dateformat = $format;
1872         } else {
1873             $dateformat = get_string('strftimedatetimeshort');
1874         }
1875     }
1876     $time = userdate($message->timecreated, $dateformat);
1877     $options = new stdClass();
1878     $options->para = false;
1879
1880     //if supplied display small messages as fullmessage may contain boilerplate text that shouldnt appear in the messaging UI
1881     if (!empty($message->smallmessage)) {
1882         $messagetext = format_text($message->smallmessage, FORMAT_MOODLE, $options);
1883     } else {
1884         $messagetext = format_text($message->fullmessage, $message->fullmessageformat, $options);
1885     }
1886
1887     $messagetext .= message_format_contexturl($message);
1888
1889     if ($keywords) {
1890         $messagetext = highlight($keywords, $messagetext);
1891     }
1892
1893     return '<div class="message '.$class.'"><a name="m'.$message->id.'"></a> <span class="time">'.$time.'</span>: <span class="content">'.$messagetext.'</span></div>';
1894 }
1895
1896 /**
1897  * Format a the context url and context url name of a message for display
1898  * @param object $message the message object
1899  * @return string the formatted string
1900  */
1901 function message_format_contexturl($message) {
1902     $s = null;
1903
1904     if (!empty($message->contexturl)) {
1905         $displaytext = null;
1906         if (!empty($message->contexturlname)) {
1907             $displaytext= $message->contexturlname;
1908         } else {
1909             $displaytext= $message->contexturl;
1910         }
1911         $s .= html_writer::start_tag('div',array('class' => 'messagecontext'));
1912             $s .= get_string('view').': '.html_writer::tag('a', $displaytext, array('href' => $message->contexturl));
1913         $s .= html_writer::end_tag('div');
1914     }
1915
1916     return $s;
1917 }
1918
1919 /**
1920  * Send a message from one user to another. Will be delivered according to the message recipients messaging preferences
1921  * @param object $userfrom the message sender
1922  * @param object $userto the message recipient
1923  * @param string $message the message
1924  * @param int $format message format such as FORMAT_PLAIN or FORMAT_HTML
1925  * @return int|false the ID of the new message or false
1926  */
1927 function message_post_message($userfrom, $userto, $message, $format) {
1928     global $SITE, $CFG, $USER;
1929
1930     $eventdata = new stdClass();
1931     $eventdata->component        = 'moodle';
1932     $eventdata->name             = 'instantmessage';
1933     $eventdata->userfrom         = $userfrom;
1934     $eventdata->userto           = $userto;
1935
1936     //using string manager directly so that strings in the message will be in the message recipients language rather than the senders
1937     $eventdata->subject          = get_string_manager()->get_string('unreadnewmessage', 'message', fullname($userfrom), $userto->lang);
1938
1939     if ($format == FORMAT_HTML) {
1940         $eventdata->fullmessage      = '';
1941         $eventdata->fullmessagehtml  = $message;
1942     } else {
1943         $eventdata->fullmessage      = $message;
1944         $eventdata->fullmessagehtml  = '';
1945     }
1946
1947     $eventdata->fullmessageformat = $format;
1948     $eventdata->smallmessage     = strip_tags($message);//strip just in case there are is any html that would break the popup notification
1949
1950     $s = new stdClass();
1951     $s->sitename = $SITE->shortname;
1952     $s->url = $CFG->wwwroot.'/message/index.php?user='.$userto->id.'&id='.$userfrom->id;
1953
1954     $emailtagline = get_string_manager()->get_string('emailtagline', 'message', $s, $userto->lang);
1955     if (!empty($eventdata->fullmessage)) {
1956         $eventdata->fullmessage .= "\n\n---------------------------------------------------------------------\n".$emailtagline;
1957     }
1958     if (!empty($eventdata->fullmessagehtml)) {
1959         $eventdata->fullmessagehtml .= "<br /><br />---------------------------------------------------------------------<br />".$emailtagline;
1960     }
1961
1962     $eventdata->timecreated     = time();
1963     return message_send($eventdata);
1964 }
1965
1966
1967 /**
1968  * Returns a list of all user ids who have used messaging in the site
1969  * This was the simple way to code the SQL ... is it going to blow up
1970  * on large datasets?
1971  */
1972 function message_get_participants() {
1973     global $CFG, $DB;
1974
1975         return $DB->get_records_sql("SELECT useridfrom as id,1 FROM {message}
1976                                UNION SELECT useridto as id,1 FROM {message}
1977                                UNION SELECT useridfrom as id,1 FROM {message_read}
1978                                UNION SELECT useridto as id,1 FROM {message_read}
1979                                UNION SELECT userid as id,1 FROM {message_contacts}
1980                                UNION SELECT contactid as id,1 from {message_contacts}");
1981 }
1982
1983 /**
1984  * Print a row of contactlist displaying user picture, messages waiting and
1985  * block links etc
1986  * @param object $contact contact object containing all fields required for $OUTPUT->user_picture()
1987  * @param bool $incontactlist is the user a contact of ours?
1988  * @param bool $isblocked is the user blocked?
1989  * @param string $selectcontacturl the url to send the user to when a contact's name is clicked
1990  * @param bool $showactionlinks display action links next to the other users (add contact, block user etc)
1991  * @param object $selecteduser the user the current user is viewing (if any). They will be highlighted.
1992  */
1993 function message_print_contactlist_user($contact, $incontactlist = true, $isblocked = false, $selectcontacturl = null, $showactionlinks = true, $selecteduser=null) {
1994     global $OUTPUT, $USER;
1995     $fullname  = fullname($contact);
1996     $fullnamelink  = $fullname;
1997
1998     $linkclass = '';
1999     if (!empty($selecteduser) && $contact->id == $selecteduser->id) {
2000         $linkclass = 'messageselecteduser';
2001     }
2002
2003     /// are there any unread messages for this contact?
2004     if ($contact->messagecount > 0 ){
2005         $fullnamelink = '<strong>'.$fullnamelink.' ('.$contact->messagecount.')</strong>';
2006     }
2007
2008     $strcontact = $strblock = $strhistory = null;
2009
2010     if ($showactionlinks) {
2011         $strcontact = message_get_contact_add_remove_link($incontactlist, $isblocked, $contact);
2012         $strblock   = message_get_contact_block_link($incontactlist, $isblocked, $contact);
2013         $strhistory = message_history_link($USER->id, $contact->id, true, '', '', 'icon');
2014     }
2015
2016     echo html_writer::start_tag('tr');
2017     echo html_writer::start_tag('td', array('class' => 'pix'));
2018     echo $OUTPUT->user_picture($contact, array('size' => 20, 'courseid' => SITEID));
2019     echo html_writer::end_tag('td');
2020
2021     echo html_writer::start_tag('td', array('class' => 'contact'));
2022
2023     $popupoptions = array(
2024             'height' => MESSAGE_DISCUSSION_HEIGHT,
2025             'width' => MESSAGE_DISCUSSION_WIDTH,
2026             'menubar' => false,
2027             'location' => false,
2028             'status' => true,
2029             'scrollbars' => true,
2030             'resizable' => true);
2031
2032     $link = $action = null;
2033     if (!empty($selectcontacturl)) {
2034         $link = new moodle_url($selectcontacturl.'&user2='.$contact->id);
2035     } else {
2036         //can $selectcontacturl be removed and maybe the be removed and hardcoded?
2037         $link = new moodle_url("/message/index.php?id=$contact->id");
2038         $action = new popup_action('click', $link, "message_$contact->id", $popupoptions);
2039     }
2040     echo $OUTPUT->action_link($link, $fullnamelink, $action, array('class' => $linkclass,'title' => get_string('sendmessageto', 'message', $fullname)));
2041
2042     echo html_writer::end_tag('td');
2043
2044     echo html_writer::tag('td', '&nbsp;'.$strcontact.$strblock.'&nbsp;'.$strhistory, array('class' => 'link'));
2045
2046     echo html_writer::end_tag('tr');
2047 }
2048
2049 /**
2050  * Constructs the add/remove contact link to display next to other users
2051  * @param bool $incontactlist is the user a contact
2052  * @param bool $isblocked is the user blocked
2053  * @param type $contact contact object
2054  * @param string $script the URL to send the user to when the link is clicked. If null, the current page.
2055  * @param bool $text include text next to the icons?
2056  * @param bool $icon include a graphical icon?
2057  * @return string
2058  */
2059 function message_get_contact_add_remove_link($incontactlist, $isblocked, $contact, $script=null, $text=false, $icon=true) {
2060     $strcontact = '';
2061
2062     if($incontactlist){
2063         $strcontact = message_contact_link($contact->id, 'remove', true, $script, $text, $icon);
2064     } else if ($isblocked) {
2065         $strcontact = message_contact_link($contact->id, 'add', true, $script, $text, $icon);
2066     } else{
2067         $strcontact = message_contact_link($contact->id, 'add', true, $script, $text, $icon);
2068     }
2069
2070     return $strcontact;
2071 }
2072
2073 /**
2074  * Constructs the block contact link to display next to other users
2075  * @param bool $incontactlist is the user a contact
2076  * @param bool $isblocked is the user blocked
2077  * @param type $contact contact object
2078  * @param string $script the URL to send the user to when the link is clicked. If null, the current page.
2079  * @param bool $text include text next to the icons?
2080  * @param bool $icon include a graphical icon?
2081  * @return string
2082  */
2083 function message_get_contact_block_link($incontactlist, $isblocked, $contact, $script=null, $text=false, $icon=true) {
2084     $strblock   = '';
2085
2086     //commented out to allow the user to block a contact without having to remove them first
2087     /*if ($incontactlist) {
2088         //$strblock = '';
2089     } else*/
2090     if ($isblocked) {
2091         $strblock   = '&nbsp;'.message_contact_link($contact->id, 'unblock', true, $script, $text, $icon);
2092     } else{
2093         $strblock   = '&nbsp;'.message_contact_link($contact->id, 'block', true, $script, $text, $icon);
2094     }
2095
2096     return $strblock;
2097 }
2098
2099  /**
2100   * Moves messages from a particular user from the message table (unread messages) to message_read
2101   * This is typically only used when a user is deleted
2102   * @param object $userid User id
2103   * @return boolean success
2104   */
2105 function message_move_userfrom_unread2read($userid) {
2106     global $DB;
2107
2108     // move all unread messages from message table to message_read
2109     if ($messages = $DB->get_records_select('message', 'useridfrom = ?', array($userid), 'timecreated')) {
2110         foreach ($messages as $message) {
2111             message_mark_message_read($message, 0); //set timeread to 0 as the message was never read
2112         }
2113     }
2114     return true;
2115 }
2116
2117 /**
2118 * marks ALL messages being sent from $fromuserid to $touserid as read
2119 * @param int $touserid the id of the message recipient
2120 * @param int $fromuserid the id of the message sender
2121 * @return void
2122 */
2123 function message_mark_messages_read($touserid, $fromuserid){
2124     global $DB;
2125
2126     $sql = 'SELECT m.* FROM {message} m WHERE m.useridto=:useridto AND m.useridfrom=:useridfrom';
2127     $messages = $DB->get_recordset_sql($sql, array('useridto' => $touserid,'useridfrom' => $fromuserid));
2128
2129     foreach ($messages as $message) {
2130         message_mark_message_read($message, time());
2131     }
2132 }
2133
2134 /**
2135 * Mark a single message as read
2136 * @param message an object with an object property ie $message->id which is an id in the message table
2137 * @param int $timeread the timestamp for when the message should be marked read. Usually time().
2138 * @param bool $messageworkingempty Is the message_working table already confirmed empty for this message?
2139 * @return int the ID of the message in the message_read table
2140 */
2141 function message_mark_message_read($message, $timeread, $messageworkingempty=false) {
2142     global $DB;
2143
2144     $message->timeread = $timeread;
2145
2146     $messageid = $message->id;
2147     unset($message->id);//unset because it will get a new id on insert into message_read
2148
2149     //If any processors have pending actions abort them
2150     if (!$messageworkingempty) {
2151         $DB->delete_records('message_working', array('unreadmessageid' => $messageid));
2152     }
2153     $messagereadid = $DB->insert_record('message_read', $message);
2154     $DB->delete_records('message', array('id' => $messageid));
2155     return $messagereadid;
2156 }
2157
2158 /**
2159  * A helper function that prints a formatted heading
2160  * @param string $title the heading to display
2161  * @param int $colspan
2162  */
2163 function message_print_heading($title, $colspan=3) {
2164     echo html_writer::start_tag('tr');
2165     echo html_writer::tag('td', $title, array('colspan' => $colspan, 'class' => 'heading'));
2166     echo html_writer::end_tag('tr');
2167 }