}
    if (!($user = $DB->get_record('user', array('id' => $userid)))) {
        print_error('invaliduserid');
    }
    if ($user->deleted) {
        echo $OUTPUT->header();
        echo $OUTPUT->heading(get_string('userdeleted'));
        echo $OUTPUT->footer();
        die;
    }
    if ($USER->id == $userid) {
        if (!has_capability('moodle/blog:create', $sitecontext) && !has_capability('moodle/blog:view', $sitecontext)) {
            print_error('donothaveblog', 'blog');
        }
    } else {
        if (!has_capability('moodle/blog:view', $sitecontext) || !blog_user_can_view_user_entry($userid)) {
            print_error('cannotviewcourseblog', 'blog');
        }
        $PAGE->navigation->extend_for_user($user);
    }
}
$courseid = empty($courseid) ? SITEID : $courseid;
$blogheaders = blog_get_headers();
$rsscontext = null;
$filtertype = null;
$thingid = null;
$rsstitle = '';
if ($CFG->enablerssfeeds) {
    list($thingid, $rsscontext, $filtertype) = blog_rss_get_params($blogheaders['filters']);
    if (empty($rsscontext)) {
        $rsscontext = context_system::instance();

/**
 * Validate comment parameter before perform other comments actions
 *
 * @package  core_blog
 * @category comment
 *
 * @param stdClass $comment {
 *              context  => context the context object
 *              courseid => int course id
 *              cm       => stdClass course module object
 *              commentarea => string comment area
 *              itemid      => int itemid
 * }
 * @return boolean
 */
function blog_comment_validate($comment_param)
{
    global $CFG, $DB, $USER;
    // Check if blogs are enabled user can comment.
    if (empty($CFG->enableblogs) || empty($CFG->blogusecomments)) {
        throw new comment_exception('nopermissiontocomment');
    }
    // Validate comment area.
    if ($comment_param->commentarea != 'format_blog') {
        throw new comment_exception('invalidcommentarea');
    }
    $blogentry = $DB->get_record('post', array('id' => $comment_param->itemid), '*', MUST_EXIST);
    // Validation for comment deletion.
    if (!empty($comment_param->commentid)) {
        if ($record = $DB->get_record('comments', array('id' => $comment_param->commentid))) {
            if ($record->commentarea != 'format_blog') {
                throw new comment_exception('invalidcommentarea');
            }
            if ($record->contextid != $comment_param->context->id) {
                throw new comment_exception('invalidcontext');
            }
            if ($record->itemid != $comment_param->itemid) {
                throw new comment_exception('invalidcommentitemid');
            }
        } else {
            throw new comment_exception('invalidcommentid');
        }
    }
    // Validate if user has blog view permission.
    $sitecontext = context_system::instance();
    return has_capability('moodle/blog:view', $sitecontext) && blog_user_can_view_user_entry($blogentry->userid, $blogentry);
}

    if ($user->deleted) {
        echo $OUTPUT->header();
        echo $OUTPUT->heading(get_string('userdeleted'));
        echo $OUTPUT->footer();
        die;
    }
    if ($USER->id == $userid) {
        if (!has_capability('moodle/blog:create', $sitecontext) && !has_capability('moodle/blog:view', $sitecontext)) {
            print_error('donothaveblog', 'blog');
        }
    } else {
        $personalcontext = context_user::instance($userid);
        if (!has_capability('moodle/blog:view', $sitecontext) && !has_capability('moodle/user:readuserblogs', $personalcontext)) {
            print_error('cannotviewuserblog', 'blog');
        }
        if (!blog_user_can_view_user_entry($userid)) {
            print_error('cannotviewcourseblog', 'blog');
        }
        $PAGE->navigation->extend_for_user($user);
    }
}
$courseid = empty($courseid) ? SITEID : $courseid;
if (empty($entryid) && empty($modid) && empty($groupid)) {
    $PAGE->set_context(context_user::instance($USER->id));
} else {
    if (!empty($modid)) {
        $PAGE->set_context(context_module::instance($modid));
    } else {
        if (!empty($courseid)) {
            $PAGE->set_context(context_course::instance($courseid));
        } else {

/**
 * Add nodes to myprofile page.
 *
 * @param \core_user\output\myprofile\tree $tree Tree object
 * @param stdClass $user user object
 * @param bool $iscurrentuser
 * @param stdClass $course Course object
 *
 * @return bool
 */
function core_blog_myprofile_navigation(core_user\output\myprofile\tree $tree, $user, $iscurrentuser, $course)
{
    global $CFG;
    if (!blog_is_enabled_for_user() || isguestuser($user)) {
        // The guest user cannot post, so it is not possible to view any posts.
        // Also blogs might be disabled.
        // May as well just bail aggressively here.
        return true;
    }
    if (!blog_user_can_view_user_entry($user->id)) {
        return true;
    }
    $url = new moodle_url("/blog/index.php", array('userid' => $user->id));
    if (!empty($course)) {
        $url->param('courseid', $course->id);
    }
    if ($iscurrentuser) {
        $title = get_string('blogentries', 'core_blog');
    } else {
        $title = get_string('myprofileuserblogs', 'core_blog');
    }
    $blognode = new core_user\output\myprofile\node('miscellaneous', 'blogs', $title, null, $url);
    $tree->add_node($blognode);
    return true;
}