1 files changed, 70 insertions, 0 deletions
diff --git a/lib/activitypub-followers.php b/lib/activitypub-followers.php
new file mode 100644
index 0000000..bc21ab5
--- /dev/null
+++ b/lib/activitypub-followers.php
@@ -0,0 +1,70 @@
+<?php
+
+if(!$config['activitypub']) exit('ActivityPub is disabled via config file.');
+
+// get total amount
+$statement = $db->prepare('SELECT COUNT(id) as total FROM followers WHERE follower_actor IS NOT NULL');
+$statement->execute();
+$followers_total = $statement->fetchAll(PDO::FETCH_ASSOC);
+$followers_total = (!empty($followers_total)) ? $followers_total[0]['total'] : 0;
+
+if(!isset($_GET['page'])):
+
+	$output = [
+		'@context' => 'https://www.w3.org/ns/activitystreams',
+		'id' => $config['url'].'/followers',
+		'type' => 'OrderedCollection',
+		'totalItems' => $followers_total,
+		'first' => $config['url'].'/followers?page=1',
+	];
+
+	header('Content-Type: application/ld+json');
+	echo(json_encode($output, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES));
+else:
+
+	// get items
+	$items_per_page = 12; // mastodon default?
+
+	// pagination
+	$current_page = (isset($_GET['page']) && is_numeric($_GET['page'])) ? (int) $_GET['page'] : 1;
+	$total_pages = ceil($followers_total / $items_per_page);
+	$offset = ($current_page-1)*$items_per_page;
+
+	if($current_page < 1 || $current_page > $total_pages) {
+		http_response_code(404);
+		header('Content-Type: application/ld+json');
+		die('{}');
+	}
+
+	$statement = $db->prepare('SELECT follower_actor FROM followers WHERE follower_actor IS NOT NULL ORDER BY follower_added ASC LIMIT :limit OFFSET :page');
+	$statement->bindValue(':limit', $items_per_page, PDO::PARAM_INT);
+	$statement->bindValue(':page', $offset, PDO::PARAM_INT);
+	$statement->execute();
+	$followers = $statement->fetchAll(PDO::FETCH_ASSOC);
+
+	$ordered_items = [];
+	if(!empty($followers)) {
+		$ordered_items = array_column($followers, 'follower_actor');
+	}
+
+	$output = [
+		'@context' => 'https://www.w3.org/ns/activitystreams',
+		'id' => $config['url'].'/followers?page='.$current_page,
+		'type' => 'OrderedCollectionPage',
+		'totalItems' => $followers_total,
+		'partOf' => $config['url'].'/followers'
+	];
+
+	if($current_page > 1) {
+		$output['prev'] = $config['url'].'/followers?page='.($current_page-1);
+	}
+
+	if($current_page < $total_pages) {
+		$output['next'] = $config['url'].'/followers?page='.($current_page+1);
+	}
+
+	$output['orderedItems'] = $ordered_items;
+
+	header('Content-Type: application/ld+json');
+	echo(json_encode($output, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES));
+endif;