river.php

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<?php
$options = array(
    'distinct' => false
);

$page_type = preg_replace('[\W]', '', get_input('page_type', 'all'));
$type = preg_replace('[\W]', '', get_input('type', 'all'));
$subtype = preg_replace('[\W]', '', get_input('subtype', ''));
if ($subtype) {
    $selector = "type=$type&subtype=$subtype";
} else {
    $selector = "type=$type";
}

if ($type != 'all') {
    $options['type'] = $type;
    if ($subtype) {
        $options['subtype'] = $subtype;
    }
}

switch ($page_type) {
    case 'mine':
        $title = elgg_echo('river:mine');
        $page_filter = 'mine';
        $options['subject_guid'] = elgg_get_logged_in_user_guid();
        break;
    case 'owner':
        $subject_username = get_input('subject_username', '', false);
        $subject = get_user_by_username($subject_username);
        if (!$subject) {
            register_error(elgg_echo('river:subject:invalid_subject'));
            forward('');
        }
        elgg_set_page_owner_guid($subject->guid);
        $title = elgg_echo('river:owner', array(htmlspecialchars($subject->name, ENT_QUOTES, 'UTF-8', false)));
        $page_filter = 'subject';
        $options['subject_guid'] = $subject->guid;
        break;
    case 'friends':
        $title = elgg_echo('river:friends');
        $page_filter = 'friends';
        $options['relationship_guid'] = elgg_get_logged_in_user_guid();
        $options['relationship'] = 'friend';
        break;
    default:
        $title = elgg_echo('river:all');
        $page_filter = 'all';
        break;
}

$activity = elgg_list_river($options);
if (!$activity) {
    $activity = elgg_echo('river:none');
}

$content = elgg_view('core/river/filter', array('selector' => $selector));

$sidebar = elgg_view('core/river/sidebar');

$params = array(
    'title' => $title,
    'content' =>  $content . $activity,
    'sidebar' => $sidebar,
    'filter_context' => $page_filter,
    'class' => 'elgg-river-layout',
);

$body = elgg_view_layout('content', $params);

echo elgg_view_page($title, $body);