Proyectos de Subversion Moodle

<?php

// This file is part of Moodle - http://moodle.org/

//

// Moodle is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// Moodle is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**

 * Edit and save a new post to a discussion

 *

 * @package   mod_forum

 * @copyright 1999 onwards Martin Dougiamas  {@link http://moodle.com}

 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

require_once('../../config.php');

require_once('lib.php');

require_once($CFG->libdir.'/completionlib.php');

$reply   = optional_param('reply', 0, PARAM_INT);

$forum   = optional_param('forum', 0, PARAM_INT);

$edit    = optional_param('edit', 0, PARAM_INT);

$delete  = optional_param('delete', 0, PARAM_INT);

$prune   = optional_param('prune', 0, PARAM_INT);

$name    = optional_param('name', '', PARAM_CLEAN);

$confirm = optional_param('confirm', 0, PARAM_INT);

$groupid = optional_param('groupid', null, PARAM_INT);

$subject = optional_param('subject', '', PARAM_TEXT);

// Values posted via the inpage reply form.

$prefilledpost = optional_param('post', '', PARAM_TEXT);

$prefilledpostformat = optional_param('postformat', FORMAT_MOODLE, PARAM_INT);

$prefilledprivatereply = optional_param('privatereply', false, PARAM_BOOL);

$PAGE->set_url('/mod/forum/post.php', array(

    'reply' => $reply,

    'forum' => $forum,

    'edit'  => $edit,

    'delete' => $delete,

    'prune' => $prune,

    'name'  => $name,

    'confirm' => $confirm,

    'groupid' => $groupid,

));

// These page_params will be passed as hidden variables later in the form.

$pageparams = array('reply' => $reply, 'forum' => $forum, 'edit' => $edit);

$sitecontext = context_system::instance();

$entityfactory = mod_forum\local\container::get_entity_factory();

$vaultfactory = mod_forum\local\container::get_vault_factory();

$managerfactory = mod_forum\local\container::get_manager_factory();

$legacydatamapperfactory = mod_forum\local\container::get_legacy_data_mapper_factory();

$urlfactory = mod_forum\local\container::get_url_factory();

$forumvault = $vaultfactory->get_forum_vault();

$forumdatamapper = $legacydatamapperfactory->get_forum_data_mapper();

$discussionvault = $vaultfactory->get_discussion_vault();

$discussiondatamapper = $legacydatamapperfactory->get_discussion_data_mapper();

$postvault = $vaultfactory->get_post_vault();

$postdatamapper = $legacydatamapperfactory->get_post_data_mapper();

if (!isloggedin() or isguestuser()) {

    if (!isloggedin() and !get_local_referer()) {

        // No referer+not logged in - probably coming in via email  See MDL-9052.

        require_login();

    }

    if (!empty($forum)) {

        // User is starting a new discussion in a forum.

        $forumentity = $forumvault->get_from_id($forum);

        if (empty($forumentity)) {

            throw new \moodle_exception('invalidforumid', 'forum');

        }

    } else if (!empty($reply)) {

        // User is writing a new reply.

        $forumentity = $forumvault->get_from_post_id($reply);

        if (empty($forumentity)) {

            throw new \moodle_exception('invalidparentpostid', 'forum');

        }

    }

    $forum = $forumdatamapper->to_legacy_object($forumentity);

    $modcontext = $forumentity->get_context();

    $course = $forumentity->get_course_record();

    if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {

        throw new \moodle_exception("invalidcoursemodule");

    }

    $PAGE->set_cm($cm, $course, $forum);

    $PAGE->set_context($modcontext);

    $PAGE->set_title($course->shortname);

    $PAGE->set_heading($course->fullname);

    $referer = get_local_referer(false);

    echo $OUTPUT->header();

    echo $OUTPUT->confirm(get_string('noguestpost', 'forum'), get_login_url(), $referer, [

        'confirmtitle' => get_string('noguestpost:title', 'forum'),

        'continuestr' => get_string('login')

    ]);

    echo $OUTPUT->footer();

    exit;

}

require_login(0, false);   // Script is useless unless they're logged in.

$canreplyprivately = false;

if (!empty($forum)) {

    // User is starting a new discussion in a forum.

    $forumentity = $forumvault->get_from_id($forum);

    if (empty($forumentity)) {

        throw new \moodle_exception('invalidforumid', 'forum');

    }

    $capabilitymanager = $managerfactory->get_capability_manager($forumentity);

    $forum = $forumdatamapper->to_legacy_object($forumentity);

    $course = $forumentity->get_course_record();

    if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {

        throw new \moodle_exception("invalidcoursemodule");

    }

    // Retrieve the contexts.

    $modcontext = $forumentity->get_context();

    $coursecontext = context_course::instance($course->id);

    if ($forumentity->is_in_group_mode() && null === $groupid) {

        $groupid = groups_get_activity_group($cm);

    }

    if (!$capabilitymanager->can_create_discussions($USER, $groupid)) {

        if (!isguestuser()) {

            if (!is_enrolled($coursecontext)) {

                if (enrol_selfenrol_available($course->id)) {

                    $SESSION->wantsurl = qualified_me();

                    $SESSION->enrolcancel = get_local_referer(false);

                    redirect(new moodle_url('/enrol/index.php', array('id' => $course->id,

                        'returnurl' => '/mod/forum/view.php?f=' . $forum->id)),

                        get_string('youneedtoenrol'));

                }

            }

        }

        throw new \moodle_exception('nopostforum', 'forum');

    }

    if (!$cm->visible and !has_capability('moodle/course:viewhiddenactivities', $modcontext)) {

        redirect(

                $urlfactory->get_course_url_from_forum($forumentity),

                get_string('activityiscurrentlyhidden'),

                null,

                \core\output\notification::NOTIFY_ERROR

            );

    }

    // Load up the $post variable.

    $post = new stdClass();

    $post->course        = $course->id;

    $post->forum         = $forum->id;

    $post->discussion    = 0;           // Ie discussion # not defined yet.

    $post->parent        = 0;

    $post->subject       = $subject;

    $post->userid        = $USER->id;

    $post->message       = $prefilledpost;

    $post->messageformat = editors_get_preferred_format();

    $post->messagetrust  = 0;

    $post->groupid = $groupid;

    // Unsetting this will allow the correct return URL to be calculated later.

    unset($SESSION->fromdiscussion);

} else if (!empty($reply)) {

    // User is writing a new reply.

    $parententity = $postvault->get_from_id($reply);

    if (empty($parententity)) {

        throw new \moodle_exception('invalidparentpostid', 'forum');

    }

    $discussionentity = $discussionvault->get_from_id($parententity->get_discussion_id());

    if (empty($discussionentity)) {

        throw new \moodle_exception('notpartofdiscussion', 'forum');

    }

    $forumentity = $forumvault->get_from_id($discussionentity->get_forum_id());

    if (empty($forumentity)) {

        throw new \moodle_exception('invalidforumid', 'forum');

    }

    $capabilitymanager = $managerfactory->get_capability_manager($forumentity);

    $parent = $postdatamapper->to_legacy_object($parententity);

    $discussion = $discussiondatamapper->to_legacy_object($discussionentity);

    $forum = $forumdatamapper->to_legacy_object($forumentity);

    $course = $forumentity->get_course_record();

    $modcontext = $forumentity->get_context();

    $coursecontext = context_course::instance($course->id);

    if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {

        throw new \moodle_exception('invalidcoursemodule');

    }

    // Ensure lang, theme, etc. is set up properly. MDL-6926.

    $PAGE->set_cm($cm, $course, $forum);

    if (!$capabilitymanager->can_reply_to_post($USER, $discussionentity, $parententity)) {

        if (!isguestuser()) {

            if (!is_enrolled($coursecontext)) {  // User is a guest here!

                $SESSION->wantsurl = qualified_me();

                $SESSION->enrolcancel = get_local_referer(false);

                redirect(new moodle_url('/enrol/index.php', array('id' => $course->id,

                    'returnurl' => '/mod/forum/view.php?f=' . $forum->id)),

                    get_string('youneedtoenrol'));

            }

            // The forum has been locked. Just redirect back to the discussion page.

            if (forum_discussion_is_locked($forum, $discussion)) {

                redirect(new moodle_url('/mod/forum/discuss.php', array('d' => $discussion->id)));

            }

        }

        throw new \moodle_exception('nopostforum', 'forum');

    }

    // Make sure user can post here.

    if (isset($cm->groupmode) && empty($course->groupmodeforce)) {

        $groupmode = $cm->groupmode;

    } else {

        $groupmode = $course->groupmode;

    }

    if ($groupmode == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $modcontext)) {

        if ($discussion->groupid == -1) {

            throw new \moodle_exception('nopostforum', 'forum');

        } else {

            if (!groups_is_member($discussion->groupid)) {

                throw new \moodle_exception('nopostforum', 'forum');

            }

        }

    }

    if (!$cm->visible and !has_capability('moodle/course:viewhiddenactivities', $modcontext)) {

        throw new \moodle_exception("activityiscurrentlyhidden");

    }

    if ($parententity->is_private_reply()) {

        throw new \moodle_exception('cannotreplytoprivatereply', 'forum');

    }

    // We always are going to honor the preferred format. We are creating a new post.

    $preferredformat = editors_get_preferred_format();

    // Only if there are prefilled contents coming.

    if (!empty($prefilledpost)) {

        // If the prefilled post is not HTML and the preferred format is HTML, convert to it.

        if ($prefilledpostformat != FORMAT_HTML and $preferredformat == FORMAT_HTML) {

            $prefilledpost = format_text($prefilledpost, $prefilledpostformat, ['context' => $modcontext]);

        }

    }

    // Load up the $post variable.

    $post = new stdClass();

    $post->course      = $course->id;

    $post->forum       = $forum->id;

    $post->discussion  = $parent->discussion;

    $post->parent      = $parent->id;

    $post->subject     = $subject ? $subject : $parent->subject;

    $post->userid      = $USER->id;

    $post->parentpostauthor = $parent->userid;

    $post->message     = $prefilledpost;

    $post->messageformat  = $preferredformat;

    $post->isprivatereply = $prefilledprivatereply;

    $canreplyprivately = $capabilitymanager->can_reply_privately_to_post($USER, $parententity);

    $post->groupid = ($discussion->groupid == -1) ? 0 : $discussion->groupid;

    $strre = get_string('re', 'forum');

    if (!(substr($post->subject, 0, strlen($strre)) == $strre)) {

        $post->subject = $strre.' '.$post->subject;

    }

    // Unsetting this will allow the correct return URL to be calculated later.

    unset($SESSION->fromdiscussion);

} else if (!empty($edit)) {

    // User is editing their own post.

    $postentity = $postvault->get_from_id($edit);

    if (empty($postentity)) {

        throw new \moodle_exception('invalidpostid', 'forum');

    }

    if ($postentity->has_parent()) {

        $parententity = $postvault->get_from_id($postentity->get_parent_id());

        $parent = $postdatamapper->to_legacy_object($parententity);

    }

    $discussionentity = $discussionvault->get_from_id($postentity->get_discussion_id());

    if (empty($discussionentity)) {

        throw new \moodle_exception('notpartofdiscussion', 'forum');

    }

    $forumentity = $forumvault->get_from_id($discussionentity->get_forum_id());

    if (empty($forumentity)) {

        throw new \moodle_exception('invalidforumid', 'forum');

    }

    $capabilitymanager = $managerfactory->get_capability_manager($forumentity);

    $post = $postdatamapper->to_legacy_object($postentity);

    $discussion = $discussiondatamapper->to_legacy_object($discussionentity);

    $forum = $forumdatamapper->to_legacy_object($forumentity);

    $course = $forumentity->get_course_record();

    $modcontext = $forumentity->get_context();

    $coursecontext = context_course::instance($course->id);

    if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {

        throw new \moodle_exception('invalidcoursemodule');

    }

    $PAGE->set_cm($cm, $course, $forum);

    if (!($forum->type == 'news' && !$post->parent && $discussion->timestart > time())) {

        if (((time() - $post->created) > $CFG->maxeditingtime) and

            !has_capability('mod/forum:editanypost', $modcontext)) {

            throw new \moodle_exception('maxtimehaspassed', 'forum', '', format_time($CFG->maxeditingtime));

        }

    }

    if (($post->userid <> $USER->id) and

        !has_capability('mod/forum:editanypost', $modcontext)) {

        throw new \moodle_exception('cannoteditposts', 'forum');

    }

    // Load up the $post variable.

    $post->edit   = $edit;

    $post->course = $course->id;

    $post->forum  = $forum->id;

    $post->groupid = ($discussion->groupid == -1) ? 0 : $discussion->groupid;

    if ($postentity->has_parent()) {

        $canreplyprivately = forum_user_can_reply_privately($modcontext, $parent);

    }

    $post = trusttext_pre_edit($post, 'message', $modcontext);

    // Unsetting this will allow the correct return URL to be calculated later.

    unset($SESSION->fromdiscussion);

} else if (!empty($delete)) {

    // User is deleting a post.

    $postentity = $postvault->get_from_id($delete);

    if (empty($postentity)) {

        throw new \moodle_exception('invalidpostid', 'forum');

    }

    $discussionentity = $discussionvault->get_from_id($postentity->get_discussion_id());

    if (empty($discussionentity)) {

        throw new \moodle_exception('notpartofdiscussion', 'forum');

    }

    $forumentity = $forumvault->get_from_id($discussionentity->get_forum_id());

    if (empty($forumentity)) {

        throw new \moodle_exception('invalidforumid', 'forum');

    }

    $capabilitymanager = $managerfactory->get_capability_manager($forumentity);

    $course = $forumentity->get_course_record();

    $cm = $forumentity->get_course_module_record();

    $modcontext = $forumentity->get_context();

    require_login($course, false, $cm);

    $replycount = $postvault->get_reply_count_for_post_id_in_discussion_id(

        $USER, $postentity->get_id(), $discussionentity->get_id(), true);

    if (!empty($confirm) && confirm_sesskey()) {

        // Do further checks and delete the post.

        $hasreplies = $replycount > 0;

        try {

            $capabilitymanager->validate_delete_post($USER, $discussionentity, $postentity, $hasreplies);

            if (!$postentity->has_parent()) {

                forum_delete_discussion(

                    $discussiondatamapper->to_legacy_object($discussionentity),

                    false,

                    $forumentity->get_course_record(),

                    $forumentity->get_course_module_record(),

                    $forumdatamapper->to_legacy_object($forumentity)

                );

                redirect(

                    $urlfactory->get_forum_view_url_from_forum($forumentity),

                    get_string('eventdiscussiondeleted', 'forum'),

                    null,

                    \core\output\notification::NOTIFY_SUCCESS

                );

            } else {

                forum_delete_post(

                    $postdatamapper->to_legacy_object($postentity),

                    has_capability('mod/forum:deleteanypost', $modcontext),

                    $forumentity->get_course_record(),

                    $forumentity->get_course_module_record(),

                    $forumdatamapper->to_legacy_object($forumentity)

                );

                if ($forumentity->get_type() == 'single') {

                    // Single discussion forums are an exception.

                    // We show the forum itself since it only has one discussion thread.

                    $discussionurl = $urlfactory->get_forum_view_url_from_forum($forumentity);

                } else {

                    $discussionurl = $urlfactory->get_discussion_view_url_from_discussion($discussionentity);

                }

                redirect(

                    forum_go_back_to($discussionurl),

                    get_string('eventpostdeleted', 'forum'),

                    null,

                    \core\output\notification::NOTIFY_SUCCESS

                );

            }

        } catch (Exception $e) {

            redirect(

                $urlfactory->get_discussion_view_url_from_discussion($discussionentity),

                $e->getMessage(),

                null,

                \core\output\notification::NOTIFY_ERROR

            );

        }

    } else {

        if (!$capabilitymanager->can_delete_post($USER, $discussionentity, $postentity)) {

            redirect(

                    $urlfactory->get_discussion_view_url_from_discussion($discussionentity),

                    get_string('cannotdeletepost', 'forum'),

                    null,

                    \core\output\notification::NOTIFY_ERROR

                );

        }

        $post = $postdatamapper->to_legacy_object($postentity);

        $forum = $forumdatamapper->to_legacy_object($forumentity);

        // User just asked to delete something.

        forum_set_return();

        $PAGE->navbar->add(get_string('delete', 'forum'));

        $PAGE->set_title($course->shortname);

        $PAGE->set_heading($course->fullname);

        $PAGE->set_secondary_active_tab('modulepage');

        $PAGE->activityheader->disable();

        if ($replycount) {

            if (!has_capability('mod/forum:deleteanypost', $modcontext)) {

                redirect(

                        forum_go_back_to($urlfactory->get_view_post_url_from_post($postentity)),

                        get_string('couldnotdeletereplies', 'forum'),

                        null,

                        \core\output\notification::NOTIFY_ERROR

                    );

            }

            echo $OUTPUT->header();

            if (!$PAGE->has_secondary_navigation()) {

                echo $OUTPUT->heading(format_string($forum->name), 2);

            }

            echo $OUTPUT->confirm(get_string("deletesureplural", "forum", $replycount + 1),

                "post.php?delete=$delete&confirm=$delete",

                $CFG->wwwroot.'/mod/forum/discuss.php?d='.$post->discussion.'#p'.$post->id);

            $postentities = [$postentity];

            if (empty($post->edit)) {

                $postvault = $vaultfactory->get_post_vault();

                $replies = $postvault->get_replies_to_post(

                        $USER,

                        $postentity,

                        // Note: All replies are fetched here as the user has deleteanypost.

                        true,

                        'created ASC'

                    );

                $postentities = array_merge($postentities, $replies);

            }

            $rendererfactory = mod_forum\local\container::get_renderer_factory();

            $postsrenderer = $rendererfactory->get_single_discussion_posts_renderer(FORUM_MODE_NESTED, true);

            echo $postsrenderer->render($USER, [$forumentity], [$discussionentity], $postentities);

        } else {

            echo $OUTPUT->header();

            if (!$PAGE->has_secondary_navigation()) {

                echo $OUTPUT->heading(format_string($forum->name), 2);

            }

            echo $OUTPUT->confirm(get_string("deletesure", "forum", $replycount),

                "post.php?delete=$delete&confirm=$delete",

                $CFG->wwwroot.'/mod/forum/discuss.php?d='.$post->discussion.'#p'.$post->id);

            $rendererfactory = mod_forum\local\container::get_renderer_factory();

            $postsrenderer = $rendererfactory->get_single_discussion_posts_renderer(null, true);

            echo $postsrenderer->render($USER, [$forumentity], [$discussionentity], [$postentity]);

        }

    }

    echo $OUTPUT->footer();

    die;

} else if (!empty($prune)) {

    // Pruning.

    $postentity = $postvault->get_from_id($prune);

    if (empty($postentity)) {

        throw new \moodle_exception('invalidpostid', 'forum');

    }

    $discussionentity = $discussionvault->get_from_id($postentity->get_discussion_id());

    if (empty($discussionentity)) {

        throw new \moodle_exception('notpartofdiscussion', 'forum');

    }

    $forumentity = $forumvault->get_from_id($discussionentity->get_forum_id());

    if (empty($forumentity)) {

        throw new \moodle_exception('invalidforumid', 'forum');

    }

    $capabilitymanager = $managerfactory->get_capability_manager($forumentity);

    $post = $postdatamapper->to_legacy_object($postentity);

    $discussion = $discussiondatamapper->to_legacy_object($discussionentity);

    $forum = $forumdatamapper->to_legacy_object($forumentity);

    $course = $forumentity->get_course_record();

    $modcontext = $forumentity->get_context();

    $coursecontext = context_course::instance($course->id);

    if (!$cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {

        throw new \moodle_exception('invalidcoursemodule');

    }

    if (!$postentity->has_parent()) {

        redirect(

                $urlfactory->get_discussion_view_url_from_discussion($discussionentity),

                get_string('alreadyfirstpost', 'forum'),

                null,

                \core\output\notification::NOTIFY_ERROR

            );

    }

    if (!$capabilitymanager->can_split_post($USER, $discussionentity, $postentity)) {

        redirect(

                $urlfactory->get_discussion_view_url_from_discussion($discussionentity),

                get_string('cannotsplit', 'forum'),

                null,

                \core\output\notification::NOTIFY_ERROR

            );

    }

    $PAGE->set_cm($cm);

    $PAGE->set_context($modcontext);

    $PAGE->set_secondary_active_tab('modulepage');

    $PAGE->activityheader->disable();

    $prunemform = new mod_forum_prune_form(null, array('prune' => $prune, 'confirm' => $prune));

    if ($prunemform->is_cancelled()) {

        redirect(forum_go_back_to($urlfactory->get_discussion_view_url_from_discussion($discussionentity)));

    } else if ($fromform = $prunemform->get_data()) {

        // User submits the data.

        $newdiscussion = new stdClass();

        $newdiscussion->course       = $discussion->course;

        $newdiscussion->forum        = $discussion->forum;

        $newdiscussion->name         = $name;

        $newdiscussion->firstpost    = $post->id;

        $newdiscussion->userid       = $post->userid;

        $newdiscussion->groupid      = $discussion->groupid;

        $newdiscussion->assessed     = $discussion->assessed;

        $newdiscussion->usermodified = $post->userid;

        $newdiscussion->timestart    = $discussion->timestart;

        $newdiscussion->timeend      = $discussion->timeend;

        $newid = $DB->insert_record('forum_discussions', $newdiscussion);

        $newpost = new stdClass();

        $newpost->id      = $post->id;

        $newpost->parent  = 0;

        $newpost->subject = $name;

        $DB->update_record("forum_posts", $newpost);

        $postentity = $postvault->get_from_id($postentity->get_id());

        forum_change_discussionid($post->id, $newid);

        // Update last post in each discussion.

        forum_discussion_update_last_post($discussion->id);

        forum_discussion_update_last_post($newid);

        // Fire events to reflect the split..

        $params = array(

            'context' => $modcontext,

            'objectid' => $discussion->id,

            'other' => array(

                'forumid' => $forum->id,

            )

        );

        $event = \mod_forum\event\discussion_updated::create($params);

        $event->trigger();

        $params = array(

            'context' => $modcontext,

            'objectid' => $newid,

            'other' => array(

                'forumid' => $forum->id,

            )

        );

        $event = \mod_forum\event\discussion_created::create($params);

        $event->trigger();

        $params = array(

            'context' => $modcontext,

            'objectid' => $post->id,

            'other' => array(

                'discussionid' => $newid,

                'forumid' => $forum->id,

                'forumtype' => $forum->type,

            )

        );

        $event = \mod_forum\event\post_updated::create($params);

        $event->add_record_snapshot('forum_discussions', $discussion);

        $event->trigger();

        redirect(

            forum_go_back_to($urlfactory->get_discussion_view_url_from_post($postentity)),

            get_string('discussionsplit', 'forum'),

            null,

            \core\output\notification::NOTIFY_SUCCESS

        );

    } else {

        // Display the prune form.

        $course = $DB->get_record('course', array('id' => $forum->course));

        $subjectstr = format_string($post->subject, true);

        $PAGE->navbar->add($subjectstr, new moodle_url('/mod/forum/discuss.php', array('d' => $discussion->id)));

        $PAGE->navbar->add(get_string("prunediscussion", "forum"));

        $PAGE->set_title(format_string($discussion->name).": ".format_string($post->subject));

        $PAGE->set_heading($course->fullname);

        echo $OUTPUT->header();

        if (!$PAGE->has_secondary_navigation()) {

            echo $OUTPUT->heading(format_string($forum->name), 2);

        }

        echo $OUTPUT->heading(get_string('pruneheading', 'forum'), 3);

        $prunemform->display();

        $postentity = $entityfactory->get_post_from_stdclass($post);

        $discussionentity = $entityfactory->get_discussion_from_stdclass($discussion);

        $forumentity = $entityfactory->get_forum_from_stdclass($forum, $modcontext, $cm, $course);

        $rendererfactory = mod_forum\local\container::get_renderer_factory();

        $postsrenderer = $rendererfactory->get_single_discussion_posts_renderer(null, true);

        echo $postsrenderer->render($USER, [$forumentity], [$discussionentity], [$postentity]);

    }

    echo $OUTPUT->footer();

    die;

} else {

    throw new \moodle_exception('unknowaction');

}

// From now on user must be logged on properly.

require_login($course, false, $cm);

if (isguestuser()) {

    // Just in case.

    throw new \moodle_exception('noguest');

}

$thresholdwarning = forum_check_throttling($forum, $cm);

$mformpost = new mod_forum_post_form('post.php', [

        'course' => $course,

        'cm' => $cm,

        'coursecontext' => $coursecontext,

        'modcontext' => $modcontext,

        'forum' => $forum,

        'post' => $post,

        'subscribe' => \mod_forum\subscriptions::is_subscribed($USER->id, $forum, null, $cm),

        'thresholdwarning' => $thresholdwarning,

        'edit' => $edit,

        'canreplyprivately' => $canreplyprivately,

    ], 'post', '', array('id' => 'mformforum'));

$draftitemid = file_get_submitted_draft_itemid('attachments');

$postid = empty($post->id) ? null : $post->id;

$attachoptions = mod_forum_post_form::attachment_options($forum);

file_prepare_draft_area($draftitemid, $modcontext->id, 'mod_forum', 'attachment', $postid, $attachoptions);

// Load data into form NOW!

if ($USER->id != $post->userid) {   // Not the original author, so add a message to the end.

    $data = new stdClass();

    $data->date = userdate($post->created);

    if ($post->messageformat == FORMAT_HTML) {

        $data->name = '<a href="'.$CFG->wwwroot.'/user/view.php?id='.$USER->id.'&course='.$post->course.'">'.

            fullname($USER).'</a>';

        $post->message .= '<p><span class="edited">('.get_string('editedby', 'forum', $data).')</span></p>';

    } else {

        $data->name = fullname($USER);

        $post->message .= "\n\n(".get_string('editedby', 'forum', $data).')';

    }

    unset($data);

}

$formheading = '';

if (!empty($parent)) {

    $heading = get_string("yourreply", "forum");

    $formheading = get_string('reply', 'forum');

} else {

    if ($forum->type == 'qanda') {

        $heading = get_string('yournewquestion', 'forum');

    } else {

        $heading = get_string('yournewtopic', 'forum');

    }

}

$postid = empty($post->id) ? null : $post->id;

$draftideditor = file_get_submitted_draft_itemid('message');

$editoropts = mod_forum_post_form::editor_options($modcontext, $postid);

$currenttext = file_prepare_draft_area($draftideditor, $modcontext->id, 'mod_forum', 'post', $postid, $editoropts, $post->message);

$discussionid = isset($discussion) ? $discussion->id : null;

$discussionsubscribe = \mod_forum\subscriptions::get_user_default_subscription($forum, $coursecontext, $cm, $discussionid);

$mformpost->set_data(

    array(

        'attachments' => $draftitemid,

        'general' => $heading,

        'subject' => $post->subject,

        'message' => array(

            'text' => $currenttext,

            'format' => !isset($post->messageformat) || !is_numeric($post->messageformat) ?

                editors_get_preferred_format() : $post->messageformat,

            'itemid' => $draftideditor

        ),

        'discussionsubscribe' => $discussionsubscribe,

        'mailnow' => !empty($post->mailnow),

        'userid' => $post->userid,

        'parent' => $post->parent,

        'discussion' => $post->discussion,

        'course' => $course->id,

        'isprivatereply' => $post->isprivatereply ?? false

    ) +

    $pageparams +

    (isset($post->format) ? array('format' => $post->format) : array()) +

    (isset($discussion->timestart) ? array('timestart' => $discussion->timestart) : array()) +

    (isset($discussion->timeend) ? array('timeend' => $discussion->timeend) : array()) +

    (isset($discussion->pinned) ? array('pinned' => $discussion->pinned) : array()) +

    (isset($post->groupid) ? array('groupid' => $post->groupid) : array()) +

    (isset($discussion->id) ? array('discussion' => $discussion->id) : array())

);

// If we are being redirected via a no_submit_button press OR if the message is being prefilled.

// then set the initial 'dirty' state.

// - A prefilled post will exist when being redirected from the inpage reply form.

// - A no_submit_button press occurs when being redirected from the inpage add new discussion post form.

$dirty = $prefilledpost ? true : false;

if ($mformpost->no_submit_button_pressed()) {

    $data = $mformpost->get_submitted_data();

    // If a no submit button has been pressed but the default values haven't been then reset the form change.

    if (!$dirty && isset($data->message['text']) && !empty(trim($data->message['text']))) {

        $dirty = true;

    }

    if (!$dirty && isset($data->message['message']) && !empty(trim($data->message['message']))) {

        $dirty = true;

    }

}

$mformpost->set_initial_dirty_state($dirty);

if ($mformpost->is_cancelled()) {

    if (!isset($discussion->id) || $forum->type === 'single') {

        // Single forums don't have a discussion page.

        redirect($urlfactory->get_forum_view_url_from_forum($forumentity));

    } else {

        redirect($urlfactory->get_discussion_view_url_from_discussion($discussionentity));

    }

} else if ($mformpost->is_submitted() && !$mformpost->no_submit_button_pressed() && $fromform = $mformpost->get_data()) {

    $errordestination = get_local_referer(false) ?: $urlfactory->get_forum_view_url_from_forum($forumentity);

    $fromform->itemid        = $fromform->message['itemid'];

    $fromform->messageformat = $fromform->message['format'];

    $fromform->message       = $fromform->message['text'];

    // WARNING: the $fromform->message array has been overwritten, do not use it anymore!

    $fromform->messagetrust  = trusttext_trusted($modcontext);

    // Do not clean text here, text cleaning can be done only after conversion to HTML.

    // Word counting now uses text formatting, there is no need to abuse trusttext_pre_edit() here.

    if ($fromform->edit) {

        // Updating a post.

        unset($fromform->groupid);

        $fromform->id = $fromform->edit;

        $message = '';

        if (!$capabilitymanager->can_edit_post($USER, $discussionentity, $postentity)) {

            redirect(

                    $urlfactory->get_view_post_url_from_post($postentity),

                    get_string('cannotupdatepost', 'forum'),

                    null,

                    \core\output\notification::ERROR

                );

        }

        if (isset($fromform->groupinfo) && $capabilitymanager->can_move_discussions($USER)) {

            // If the user has access to all groups and they are changing the group, then update the post.

            if (empty($fromform->groupinfo)) {

                $fromform->groupinfo = -1;

            }

            if (!$capabilitymanager->can_create_discussions($USER, $fromform->groupinfo)) {

                redirect(

                        $urlfactory->get_view_post_url_from_post($postentity),

                        get_string('cannotupdatepost', 'forum'),

                        null,

                        \core\output\notification::ERROR

                    );

            }

            if ($discussionentity->get_group_id() != $fromform->groupinfo) {

                $DB->set_field('forum_discussions', 'groupid', $fromform->groupinfo, array('firstpost' => $fromform->id));

            }

        }

        // When editing first post/discussion.

        if (!$postentity->has_parent()) {

            if ($capabilitymanager->can_pin_discussions($USER)) {

                // Can change pinned if we have capability.

                $fromform->pinned = !empty($fromform->pinned) ? FORUM_DISCUSSION_PINNED : FORUM_DISCUSSION_UNPINNED;

            } else {

                // We don't have the capability to change so keep to previous value.

                unset($fromform->pinned);

            }

        }

        $updatepost = $fromform;

        $updatepost->forum = $forum->id;

        if (!forum_update_post($updatepost, $mformpost)) {

            throw new \moodle_exception("couldnotupdate", "forum", $errordestination);

        }

        forum_trigger_post_updated_event($post, $discussion, $modcontext, $forum);

        if ($USER->id === $postentity->get_author_id()) {

            $message .= get_string("postupdated", "forum");

        } else {

            $realuser = \core_user::get_user($postentity->get_author_id());

            $message .= get_string("editedpostupdated", "forum", fullname($realuser));

        }

        $subscribemessage = forum_post_subscription($fromform, $forum, $discussion);

        if ('single' == $forumentity->get_type()) {

            // Single discussion forums are an exception.

            // We show the forum itself since it only has one discussion thread.

            $discussionurl = $urlfactory->get_forum_view_url_from_forum($forumentity);

        } else {

            $discussionurl = $urlfactory->get_view_post_url_from_post($postentity);

        }

        redirect(

            forum_go_back_to($discussionurl),

            $message . $subscribemessage,

            null,

            \core\output\notification::NOTIFY_SUCCESS

        );

    } else if ($fromform->discussion) {

        // Adding a new post to an existing discussion

        // Before we add this we must check that the user will not exceed the blocking threshold.

        forum_check_blocking_threshold($thresholdwarning);

        unset($fromform->groupid);

        $message = '';

        $addpost = $fromform;

        $addpost->forum = $forum->id;

        if ($fromform->id = forum_add_new_post($addpost, $mformpost)) {

            $postentity = $postvault->get_from_id($fromform->id);

            $fromform->deleted = 0;

            $subscribemessage = forum_post_subscription($fromform, $forum, $discussion);

            if (!empty($fromform->mailnow)) {

                $message .= get_string("postmailnow", "forum");

            } else {

                $message .= '<p>'.get_string("postaddedsuccess", "forum") . '</p>';

                $message .= '<p>'.get_string("postaddedtimeleft", "forum", format_time($CFG->maxeditingtime)) . '</p>';

            }

            if ($forum->type == 'single') {

                // Single discussion forums are an exception.

                // We show the forum itself since it only has one discussion thread.

                $discussionurl = $urlfactory->get_forum_view_url_from_forum($forumentity);

            } else {

                $discussionurl = $urlfactory->get_view_post_url_from_post($postentity);

            }

            $params = array(

                'context' => $modcontext,

                'objectid' => $fromform->id,

                'other' => array(

                    'discussionid' => $discussion->id,

                    'forumid' => $forum->id,

                    'forumtype' => $forum->type,

                )

            );

            $event = \mod_forum\event\post_created::create($params);

            $event->add_record_snapshot('forum_posts', $fromform);

            $event->add_record_snapshot('forum_discussions', $discussion);

            $event->trigger();

            // Update completion state.

            $completion = new completion_info($course);

            if ($completion->is_enabled($cm) &&

                ($forum->completionreplies || $forum->completionposts)) {

                $completion->update_state($cm, COMPLETION_COMPLETE);

            }

            redirect(

                forum_go_back_to($discussionurl),

                $message . $subscribemessage,

                null,

                \core\output\notification::NOTIFY_SUCCESS

            );

        } else {

            throw new \moodle_exception("couldnotadd", "forum", $errordestination);

        }

        exit;

    } else {

        // Adding a new discussion.

        // The location to redirect to after successfully posting.

        $redirectto = new moodle_url('/mod/forum/view.php', array('f' => $fromform->forum));

        $fromform->mailnow = empty($fromform->mailnow) ? 0 : 1;

        $discussion = $fromform;

        $discussion->name = $fromform->subject;

        $discussion->timelocked = 0;

        $newstopic = false;

        if ($forum->type == 'news' && !$fromform->parent) {

            $newstopic = true;

        }

        if (!empty($fromform->pinned) && $capabilitymanager->can_pin_discussions($USER)) {

            $discussion->pinned = FORUM_DISCUSSION_PINNED;

        } else {

            $discussion->pinned = FORUM_DISCUSSION_UNPINNED;

        }

        $allowedgroups = array();

        $groupstopostto = array();

        // If we are posting a copy to all groups the user has access to.

        if (isset($fromform->posttomygroups)) {

            // Post to each of my groups.

            require_capability('mod/forum:canposttomygroups', $modcontext);

            // Fetch all of this user's groups.

            // Note: all groups are returned when in visible groups mode so we must manually filter.

            $allowedgroups = groups_get_activity_allowed_groups($cm);

            foreach ($allowedgroups as $groupid => $group) {

                if ($capabilitymanager->can_create_discussions($USER, $groupid)) {

                    $groupstopostto[] = $groupid;

                }

            }

        } else if (isset($fromform->groupinfo)) {

            // Use the value provided in the dropdown group selection.

            $groupstopostto[] = $fromform->groupinfo;

            $redirectto->param('group', $fromform->groupinfo);

        } else if (isset($fromform->groupid) && !empty($fromform->groupid)) {

            // Use the value provided in the hidden form element instead.

            $groupstopostto[] = $fromform->groupid;

            $redirectto->param('group', $fromform->groupid);

        } else {

            // Use the value for all participants instead.

            $groupstopostto[] = -1;

        }

        // Before we post this we must check that the user will not exceed the blocking threshold.

        forum_check_blocking_threshold($thresholdwarning);

        foreach ($groupstopostto as $group) {

            if (!$capabilitymanager->can_create_discussions($USER, $group)) {

                throw new \moodle_exception('cannotcreatediscussion', 'forum');

            }

            $discussion->groupid = $group;

            $message = '';

            if ($discussion->id = forum_add_discussion($discussion, $mformpost)) {

                $params = array(

                    'context' => $modcontext,