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   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   * Displays a post, and all the posts below it.
  20   * If no post is given, displays all posts in a discussion
  21   *
  22   * @package   mod_forum
  23   * @copyright 1999 onwards Martin Dougiamas  {@link http://moodle.com}
  24   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25   */
  26  
  27  require_once('../../config.php');
  28  
  29  $d      = required_param('d', PARAM_INT);                // Discussion ID
  30  $parent = optional_param('parent', 0, PARAM_INT);        // If set, then display this post and all children.
  31  $mode   = optional_param('mode', 0, PARAM_INT);          // If set, changes the layout of the thread
  32  $move   = optional_param('move', 0, PARAM_INT);          // If set, moves this discussion to another forum
  33  $mark   = optional_param('mark', '', PARAM_ALPHA);       // Used for tracking read posts if user initiated.
  34  $postid = optional_param('postid', 0, PARAM_INT);        // Used for tracking read posts if user initiated.
  35  $pin    = optional_param('pin', -1, PARAM_INT);          // If set, pin or unpin this discussion.
  36  
  37  $url = new moodle_url('/mod/forum/discuss.php', array('d'=>$d));
  38  if ($parent !== 0) {
  39      $url->param('parent', $parent);
  40  }
  41  $PAGE->set_url($url);
  42  
  43  $discussion = $DB->get_record('forum_discussions', array('id' => $d), '*', MUST_EXIST);
  44  $course = $DB->get_record('course', array('id' => $discussion->course), '*', MUST_EXIST);
  45  $forum = $DB->get_record('forum', array('id' => $discussion->forum), '*', MUST_EXIST);
  46  $cm = get_coursemodule_from_instance('forum', $forum->id, $course->id, false, MUST_EXIST);
  47  
  48  require_course_login($course, true, $cm);
  49  
  50  // move this down fix for MDL-6926
  51  require_once($CFG->dirroot.'/mod/forum/lib.php');
  52  
  53  $modcontext = context_module::instance($cm->id);
  54  require_capability('mod/forum:viewdiscussion', $modcontext, NULL, true, 'noviewdiscussionspermission', 'forum');
  55  
  56  if (!empty($CFG->enablerssfeeds) && !empty($CFG->forum_enablerssfeeds) && $forum->rsstype && $forum->rssarticles) {
  57      require_once("$CFG->libdir/rsslib.php");
  58  
  59      $rsstitle = format_string($course->shortname, true, array('context' => context_course::instance($course->id))) . ': ' . format_string($forum->name);
  60      rss_add_http_header($modcontext, 'mod_forum', $forum, $rsstitle);
  61  }
  62  
  63  // Move discussion if requested.
  64  if ($move > 0 and confirm_sesskey()) {
  65      $return = $CFG->wwwroot.'/mod/forum/discuss.php?d='.$discussion->id;
  66  
  67      if (!$forumto = $DB->get_record('forum', array('id' => $move))) {
  68          print_error('cannotmovetonotexist', 'forum', $return);
  69      }
  70  
  71      require_capability('mod/forum:movediscussions', $modcontext);
  72  
  73      if ($forum->type == 'single') {
  74          print_error('cannotmovefromsingleforum', 'forum', $return);
  75      }
  76  
  77      if (!$forumto = $DB->get_record('forum', array('id' => $move))) {
  78          print_error('cannotmovetonotexist', 'forum', $return);
  79      }
  80  
  81      if ($forumto->type == 'single') {
  82          print_error('cannotmovetosingleforum', 'forum', $return);
  83      }
  84  
  85      // Get target forum cm and check it is visible to current user.
  86      $modinfo = get_fast_modinfo($course);
  87      $forums = $modinfo->get_instances_of('forum');
  88      if (!array_key_exists($forumto->id, $forums)) {
  89          print_error('cannotmovetonotfound', 'forum', $return);
  90      }
  91      $cmto = $forums[$forumto->id];
  92      if (!$cmto->uservisible) {
  93          print_error('cannotmovenotvisible', 'forum', $return);
  94      }
  95  
  96      $destinationctx = context_module::instance($cmto->id);
  97      require_capability('mod/forum:startdiscussion', $destinationctx);
  98  
  99      if (!forum_move_attachments($discussion, $forum->id, $forumto->id)) {
 100          echo $OUTPUT->notification("Errors occurred while moving attachment directories - check your file permissions");
 101      }
 102      // For each subscribed user in this forum and discussion, copy over per-discussion subscriptions if required.
 103      $discussiongroup = $discussion->groupid == -1 ? 0 : $discussion->groupid;
 104      $potentialsubscribers = \mod_forum\subscriptions::fetch_subscribed_users(
 105          $forum,
 106          $discussiongroup,
 107          $modcontext,
 108          'u.id',
 109          true
 110      );
 111  
 112      // Pre-seed the subscribed_discussion caches.
 113      // Firstly for the forum being moved to.
 114      \mod_forum\subscriptions::fill_subscription_cache($forumto->id);
 115      // And also for the discussion being moved.
 116      \mod_forum\subscriptions::fill_subscription_cache($forum->id);
 117      $subscriptionchanges = array();
 118      $subscriptiontime = time();
 119      foreach ($potentialsubscribers as $subuser) {
 120          $userid = $subuser->id;
 121          $targetsubscription = \mod_forum\subscriptions::is_subscribed($userid, $forumto, null, $cmto);
 122          $discussionsubscribed = \mod_forum\subscriptions::is_subscribed($userid, $forum, $discussion->id);
 123          $forumsubscribed = \mod_forum\subscriptions::is_subscribed($userid, $forum);
 124  
 125          if ($forumsubscribed && !$discussionsubscribed && $targetsubscription) {
 126              // The user has opted out of this discussion and the move would cause them to receive notifications again.
 127              // Ensure they are unsubscribed from the discussion still.
 128              $subscriptionchanges[$userid] = \mod_forum\subscriptions::FORUM_DISCUSSION_UNSUBSCRIBED;
 129          } else if (!$forumsubscribed && $discussionsubscribed && !$targetsubscription) {
 130              // The user has opted into this discussion and would otherwise not receive the subscription after the move.
 131              // Ensure they are subscribed to the discussion still.
 132              $subscriptionchanges[$userid] = $subscriptiontime;
 133          }
 134      }
 135  
 136      $DB->set_field('forum_discussions', 'forum', $forumto->id, array('id' => $discussion->id));
 137      $DB->set_field('forum_read', 'forumid', $forumto->id, array('discussionid' => $discussion->id));
 138  
 139      // Delete the existing per-discussion subscriptions and replace them with the newly calculated ones.
 140      $DB->delete_records('forum_discussion_subs', array('discussion' => $discussion->id));
 141      $newdiscussion = clone $discussion;
 142      $newdiscussion->forum = $forumto->id;
 143      foreach ($subscriptionchanges as $userid => $preference) {
 144          if ($preference != \mod_forum\subscriptions::FORUM_DISCUSSION_UNSUBSCRIBED) {
 145              // Users must have viewdiscussion to a discussion.
 146              if (has_capability('mod/forum:viewdiscussion', $destinationctx, $userid)) {
 147                  \mod_forum\subscriptions::subscribe_user_to_discussion($userid, $newdiscussion, $destinationctx);
 148              }
 149          } else {
 150              \mod_forum\subscriptions::unsubscribe_user_from_discussion($userid, $newdiscussion, $destinationctx);
 151          }
 152      }
 153  
 154      $params = array(
 155          'context' => $destinationctx,
 156          'objectid' => $discussion->id,
 157          'other' => array(
 158              'fromforumid' => $forum->id,
 159              'toforumid' => $forumto->id,
 160          )
 161      );
 162      $event = \mod_forum\event\discussion_moved::create($params);
 163      $event->add_record_snapshot('forum_discussions', $discussion);
 164      $event->add_record_snapshot('forum', $forum);
 165      $event->add_record_snapshot('forum', $forumto);
 166      $event->trigger();
 167  
 168      // Delete the RSS files for the 2 forums to force regeneration of the feeds
 169      require_once($CFG->dirroot.'/mod/forum/rsslib.php');
 170      forum_rss_delete_file($forum);
 171      forum_rss_delete_file($forumto);
 172  
 173      redirect($return.'&move=-1&sesskey='.sesskey());
 174  }
 175  // Pin or unpin discussion if requested.
 176  if ($pin !== -1 && confirm_sesskey()) {
 177      require_capability('mod/forum:pindiscussions', $modcontext);
 178  
 179      $params = array('context' => $modcontext, 'objectid' => $discussion->id, 'other' => array('forumid' => $forum->id));
 180  
 181      switch ($pin) {
 182          case FORUM_DISCUSSION_PINNED:
 183              // Pin the discussion and trigger discussion pinned event.
 184              forum_discussion_pin($modcontext, $forum, $discussion);
 185              break;
 186          case FORUM_DISCUSSION_UNPINNED:
 187              // Unpin the discussion and trigger discussion unpinned event.
 188              forum_discussion_unpin($modcontext, $forum, $discussion);
 189              break;
 190          default:
 191              echo $OUTPUT->notification("Invalid value when attempting to pin/unpin discussion");
 192              break;
 193      }
 194  
 195      redirect(new moodle_url('/mod/forum/discuss.php', array('d' => $discussion->id)));
 196  }
 197  
 198  // Trigger discussion viewed event.
 199  forum_discussion_view($modcontext, $forum, $discussion);
 200  
 201  unset($SESSION->fromdiscussion);
 202  
 203  if ($mode) {
 204      set_user_preference('forum_displaymode', $mode);
 205  }
 206  
 207  $displaymode = get_user_preferences('forum_displaymode', $CFG->forum_displaymode);
 208  
 209  if ($parent) {
 210      // If flat AND parent, then force nested display this time
 211      if ($displaymode == FORUM_MODE_FLATOLDEST or $displaymode == FORUM_MODE_FLATNEWEST) {
 212          $displaymode = FORUM_MODE_NESTED;
 213      }
 214  } else {
 215      $parent = $discussion->firstpost;
 216  }
 217  
 218  if (! $post = forum_get_post_full($parent)) {
 219      print_error("notexists", 'forum', "$CFG->wwwroot/mod/forum/view.php?f=$forum->id");
 220  }
 221  
 222  if (!forum_user_can_see_post($forum, $discussion, $post, null, $cm)) {
 223      print_error('noviewdiscussionspermission', 'forum', "$CFG->wwwroot/mod/forum/view.php?id=$forum->id");
 224  }
 225  
 226  if ($mark == 'read' or $mark == 'unread') {
 227      if ($CFG->forum_usermarksread && forum_tp_can_track_forums($forum) && forum_tp_is_tracked($forum)) {
 228          if ($mark == 'read') {
 229              forum_tp_add_read_record($USER->id, $postid);
 230          } else {
 231              // unread
 232              forum_tp_delete_read_records($USER->id, $postid);
 233          }
 234      }
 235  }
 236  
 237  $searchform = forum_search_form($course);
 238  
 239  $forumnode = $PAGE->navigation->find($cm->id, navigation_node::TYPE_ACTIVITY);
 240  if (empty($forumnode)) {
 241      $forumnode = $PAGE->navbar;
 242  } else {
 243      $forumnode->make_active();
 244  }
 245  $node = $forumnode->add(format_string($discussion->name), new moodle_url('/mod/forum/discuss.php', array('d'=>$discussion->id)));
 246  $node->display = false;
 247  if ($node && $post->id != $discussion->firstpost) {
 248      $node->add(format_string($post->subject), $PAGE->url);
 249  }
 250  
 251  $PAGE->set_title("$course->shortname: ".format_string($discussion->name));
 252  $PAGE->set_heading($course->fullname);
 253  $PAGE->set_button($searchform);
 254  $renderer = $PAGE->get_renderer('mod_forum');
 255  
 256  echo $OUTPUT->header();
 257  
 258  echo $OUTPUT->heading(format_string($forum->name), 2);
 259  echo $OUTPUT->heading(format_string($discussion->name), 3, 'discussionname');
 260  
 261  // is_guest should be used here as this also checks whether the user is a guest in the current course.
 262  // Guests and visitors cannot subscribe - only enrolled users.
 263  if ((!is_guest($modcontext, $USER) && isloggedin()) && has_capability('mod/forum:viewdiscussion', $modcontext)) {
 264      // Discussion subscription.
 265      if (\mod_forum\subscriptions::is_subscribable($forum)) {
 266          echo html_writer::div(
 267              forum_get_discussion_subscription_icon($forum, $post->discussion, null, true),
 268              'discussionsubscription'
 269          );
 270          echo forum_get_discussion_subscription_icon_preloaders();
 271      }
 272  }
 273  
 274  
 275  /// Check to see if groups are being used in this forum
 276  /// If so, make sure the current person is allowed to see this discussion
 277  /// Also, if we know they should be able to reply, then explicitly set $canreply for performance reasons
 278  
 279  $canreply = forum_user_can_post($forum, $discussion, $USER, $cm, $course, $modcontext);
 280  if (!$canreply and $forum->type !== 'news') {
 281      if (isguestuser() or !isloggedin()) {
 282          $canreply = true;
 283      }
 284      if (!is_enrolled($modcontext) and !is_viewing($modcontext)) {
 285          // allow guests and not-logged-in to see the link - they are prompted to log in after clicking the link
 286          // normal users with temporary guest access see this link too, they are asked to enrol instead
 287          $canreply = enrol_selfenrol_available($course->id);
 288      }
 289  }
 290  
 291  // Output the links to neighbour discussions.
 292  $neighbours = forum_get_discussion_neighbours($cm, $discussion, $forum);
 293  $neighbourlinks = $renderer->neighbouring_discussion_navigation($neighbours['prev'], $neighbours['next']);
 294  echo $neighbourlinks;
 295  
 296  /// Print the controls across the top
 297  echo '<div class="discussioncontrols clearfix"><div class="controlscontainer">';
 298  
 299  if (!empty($CFG->enableportfolios) && has_capability('mod/forum:exportdiscussion', $modcontext)) {
 300      require_once($CFG->libdir.'/portfoliolib.php');
 301      $button = new portfolio_add_button();
 302      $button->set_callback_options('forum_portfolio_caller', array('discussionid' => $discussion->id), 'mod_forum');
 303      $button = $button->to_html(PORTFOLIO_ADD_FULL_FORM, get_string('exportdiscussion', 'mod_forum'));
 304      $buttonextraclass = '';
 305      if (empty($button)) {
 306          // no portfolio plugin available.
 307          $button = '&nbsp;';
 308          $buttonextraclass = ' noavailable';
 309      }
 310      echo html_writer::tag('div', $button, array('class' => 'discussioncontrol exporttoportfolio'.$buttonextraclass));
 311  } else {
 312      echo html_writer::tag('div', '&nbsp;', array('class'=>'discussioncontrol nullcontrol'));
 313  }
 314  
 315  // groups selector not needed here
 316  echo '<div class="discussioncontrol displaymode">';
 317  forum_print_mode_form($discussion->id, $displaymode);
 318  echo "</div>";
 319  
 320  if ($forum->type != 'single'
 321              && has_capability('mod/forum:movediscussions', $modcontext)) {
 322  
 323      echo '<div class="discussioncontrol movediscussion">';
 324      // Popup menu to move discussions to other forums. The discussion in a
 325      // single discussion forum can't be moved.
 326      $modinfo = get_fast_modinfo($course);
 327      if (isset($modinfo->instances['forum'])) {
 328          $forummenu = array();
 329          // Check forum types and eliminate simple discussions.
 330          $forumcheck = $DB->get_records('forum', array('course' => $course->id),'', 'id, type');
 331          foreach ($modinfo->instances['forum'] as $forumcm) {
 332              if (!$forumcm->uservisible || !has_capability('mod/forum:startdiscussion',
 333                  context_module::instance($forumcm->id))) {
 334                  continue;
 335              }
 336              $section = $forumcm->sectionnum;
 337              $sectionname = get_section_name($course, $section);
 338              if (empty($forummenu[$section])) {
 339                  $forummenu[$section] = array($sectionname => array());
 340              }
 341              $forumidcompare = $forumcm->instance != $forum->id;
 342              $forumtypecheck = $forumcheck[$forumcm->instance]->type !== 'single';
 343              if ($forumidcompare and $forumtypecheck) {
 344                  $url = "/mod/forum/discuss.php?d=$discussion->id&move=$forumcm->instance&sesskey=".sesskey();
 345                  $forummenu[$section][$sectionname][$url] = format_string($forumcm->name);
 346              }
 347          }
 348          if (!empty($forummenu)) {
 349              echo '<div class="movediscussionoption">';
 350              $select = new url_select($forummenu, '',
 351                      array('/mod/forum/discuss.php?d=' . $discussion->id => get_string("movethisdiscussionto", "forum")),
 352                      'forummenu', get_string('move'));
 353              echo $OUTPUT->render($select);
 354              echo "</div>";
 355          }
 356      }
 357      echo "</div>";
 358  }
 359  
 360  if (has_capability('mod/forum:pindiscussions', $modcontext)) {
 361      if ($discussion->pinned == FORUM_DISCUSSION_PINNED) {
 362          $pinlink = FORUM_DISCUSSION_UNPINNED;
 363          $pintext = get_string('discussionunpin', 'forum');
 364      } else {
 365          $pinlink = FORUM_DISCUSSION_PINNED;
 366          $pintext = get_string('discussionpin', 'forum');
 367      }
 368      $button = new single_button(new moodle_url('discuss.php', array('pin' => $pinlink, 'd' => $discussion->id)), $pintext, 'post');
 369      echo html_writer::tag('div', $OUTPUT->render($button), array('class' => 'discussioncontrol pindiscussion'));
 370  }
 371  
 372  
 373  echo "</div></div>";
 374  
 375  if (!empty($forum->blockafter) && !empty($forum->blockperiod)) {
 376      $a = new stdClass();
 377      $a->blockafter  = $forum->blockafter;
 378      $a->blockperiod = get_string('secondstotime'.$forum->blockperiod);
 379      echo $OUTPUT->notification(get_string('thisforumisthrottled','forum',$a));
 380  }
 381  
 382  if ($forum->type == 'qanda' && !has_capability('mod/forum:viewqandawithoutposting', $modcontext) &&
 383              !forum_user_has_posted($forum->id,$discussion->id,$USER->id)) {
 384      echo $OUTPUT->notification(get_string('qandanotify', 'forum'));
 385  }
 386  
 387  if ($move == -1 and confirm_sesskey()) {
 388      echo $OUTPUT->notification(get_string('discussionmoved', 'forum', format_string($forum->name,true)), 'notifysuccess');
 389  }
 390  
 391  $canrate = has_capability('mod/forum:rate', $modcontext);
 392  forum_print_discussion($course, $cm, $forum, $discussion, $post, $displaymode, $canreply, $canrate);
 393  
 394  echo $neighbourlinks;
 395  
 396  // Add the subscription toggle JS.
 397  $PAGE->requires->yui_module('moodle-mod_forum-subscriptiontoggle', 'Y.M.mod_forum.subscriptiontoggle.init');
 398  
 399  echo $OUTPUT->footer();