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<?php
if(!$config['activitypub']) exit('ActivityPub is disabled via config file.');
$posts_per_page = 20; // 20 is mastodon default?
$posts_total = db_posts_count(); // get total amount of posts
$total_pages = ceil($posts_total / $posts_per_page);
if(!isset($_GET['page'])):
$output = [
'@context' => 'https://www.w3.org/ns/activitystreams',
'id' => $config['url'].'/outbox',
'type' => 'OrderedCollection',
'totalItems' => $posts_total,
'first' => $config['url'].'/outbox?page=1',
'last' => $config['url'].'/outbox?page='.$total_pages
];
header('Content-Type: application/ld+json');
echo(json_encode($output, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES));
else:
// pagination
$current_page = (isset($_GET['page']) && is_numeric($_GET['page'])) ? (int) $_GET['page'] : 1;
$offset = ($current_page-1)*$posts_per_page;
if($current_page < 1 || $current_page > $total_pages) {
http_response_code(404);
header('Content-Type: application/ld+json');
die('{}');
}
$posts = db_select_posts(NOW, $posts_per_page, 'desc', $offset);
$ordered_items = [];
if(!empty($posts)) {
foreach ($posts as $post) {
$item = [];
$item['id'] = $config['url'].'/'.$post['id'].'/json';
$item['type'] = 'Create';
$item['actor'] = $config['url'].'/actor';
$item['published'] = gmdate('Y-m-d\TH:i:s\Z', $post['post_timestamp']);
$item['to'] = ['https://www.w3.org/ns/activitystreams#Public'];
$item['cc'] = [$config['url'].'/followers'];
$item['object'] = $config['url'].'/'.$post['id'].'/';
$ordered_items[] = $item;
}
}
$output = [
'@context' => 'https://www.w3.org/ns/activitystreams',
'id' => $config['url'].'/outbox?page='.$current_page,
'type' => 'OrderedCollectionPage',
'partOf' => $config['url'].'/outbox'
];
if($current_page > 1) {
$output['prev'] = $config['url'].'/outbox?page='.($current_page-1);
}
if($current_page < $total_pages) {
$output['next'] = $config['url'].'/outbox?page='.($current_page+1);
}
$output['orderedItems'] = $ordered_items;
header('Content-Type: application/ld+json');
echo(json_encode($output, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES));
endif;
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