1 files changed, 72 insertions, 0 deletions
diff --git a/lib/activitypub-outbox.php b/lib/activitypub-outbox.php
new file mode 100644
index 0000000..242c695
--- /dev/null
+++ b/lib/activitypub-outbox.php
@@ -0,0 +1,72 @@
+<?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;