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<?php
// https://paul.kinlan.me/adding-activity-pub-to-your-static-site/
// https://bovine.readthedocs.io/en/latest/tutorial_server.html
// https://github.com/timmot/activity-pub-tutorial
// https://magazine.joomla.org/all-issues/february-2023/turning-the-joomla-website-into-an-activitypub-server
// https://codeberg.org/mro/activitypub/src/commit/4b1319d5363f4a836f23c784ef780b81bc674013/like.sh#L101
// todo: handle account moves
// https://seb.jambor.dev/posts/understanding-activitypub/
if(!$config['activitypub']) exit('ActivityPub is disabled via config file.');
$postdata = file_get_contents('php://input');
if(!empty($postdata)) {
$data = json_decode($postdata, true);
$inbox = parse_url($config['url'].'/inbox');
$request = [
'host' => $inbox['host'],
'path' => $inbox['path'],
'digest' => $_SERVER['HTTP_DIGEST'],
'date' => $_SERVER['HTTP_DATE'],
'length' => $_SERVER['CONTENT_LENGTH'],
'type' => $_SERVER['CONTENT_TYPE']
];
header('Content-Type: application/ld+json');
ap_log('POSTDATA', $postdata);
// ap_log('REQUEST', json_encode($request));
// verify message digest
$digest_verify = activitypub_digest($postdata);
if($digest_verify === $request['digest']) {
// ap_log('DIGEST', 'Passed verification for ' . $digest_verify);
} else {
ap_log('ERROR', json_encode(['digest verification failed!', $request['digest'], $digest_verify], JSON_PRETTY_PRINT));
}
// GET ACTOR DETAILS
if(!empty($data) && !empty($data['actor'])) {
$actor = activitypub_get_actor_data($data['actor']);
if(!empty($actor)) {
$actor_key = $actor['publicKey'];
$info = parse_url($actor['inbox']);
} else {
exit('could not parse actor data');
}
} else {
exit('no actor provided');
}
$signature = [];
$signature_string = $_SERVER['HTTP_SIGNATURE'];
$parts = explode(',', stripslashes($signature_string));
foreach ($parts as $part) {
$part = trim($part, '"');
list($k, $v) = explode('=', $part);
$signature[$k] = trim($v, '"');
}
// ap_log('SIGNATURE', json_encode($signature));
// ap_log('ACTOR', json_encode($actor));
// ap_log('PUBLIC KEY', str_replace("\n", '\n', $actor_key['publicKeyPem']));
$plaintext = activitypub_plaintext($request['path'], $request['host'], $request['date'], $request['digest'], $request['type']);
// verify request signature
$result = activitypub_verify($signature['signature'], $actor_key['publicKeyPem'], $plaintext);
if($result != 1) {
ap_log('REQUEST', json_encode($request));
ap_log('SIGNATURE', json_encode($signature));
ap_log('PUBLIC KEY', str_replace("\n", '\n', $actor_key['publicKeyPem']));
ap_log('RESULT', json_encode([$result, $plaintext], JSON_PRETTY_PRINT));
ap_log('SSL ERROR', 'message signature did not match');
exit('message signature did not match');
} else {
ap_log('SSL OKAY', json_encode([$request, $signature, $result, $plaintext, $actor_key['publicKeyPem']], JSON_PRETTY_PRINT));
}
// message signature was ok, now handle the request
if(!empty($data['type'])) {
if(mb_strtolower($data['type']) == 'follow') {
// follow
$accept_data = [
'@context' => 'https://www.w3.org/ns/activitystreams',
'id' => sprintf('%s/activity/%s', $config['url'], uniqid()),
'type' => 'Accept',
'actor' => sprintf('%s/actor', $config['url']),
'object' => $data
];
// send back Accept activity
activitypub_send_request($info['host'], $info['path'], $accept_data);
$now = time();
$follower = [
'name' => $actor['preferredUsername'],
'host' => $info['host'],
'actor' => $data['actor'],
'inbox' => $actor['inbox'],
'added' => time()
];
try {
$statement = $db->prepare('INSERT OR IGNORE INTO followers (follower_name, follower_host, follower_actor, follower_inbox, follower_shared_inbox, follower_added) VALUES (:follower_name, :follower_host, :follower_actor, :follower_inbox, :follower_shared_inbox, :follower_added)');
$statement->bindValue(':follower_name', $follower['name'], PDO::PARAM_STR);
$statement->bindValue(':follower_host', $follower['host'], PDO::PARAM_STR);
$statement->bindValue(':follower_actor', $follower['actor'], PDO::PARAM_STR);
$statement->bindValue(':follower_inbox', $follower['inbox'], PDO::PARAM_STR);
$statement->bindValue(':follower_added', $follower['added'], PDO::PARAM_INT);
// store shared inbox if possible
if(!empty($actor['endpoints']) && !empty($actor['endpoints']['sharedInbox'])) {
$statement->bindValue(':follower_shared_inbox', $actor['endpoints']['sharedInbox'], PDO::PARAM_STR);
} else {
$statement->bindValue(':follower_shared_inbox', null, PDO::PARAM_NULL);
}
$statement->execute();
} catch(PDOException $e) {
print 'Exception : '.$e->getMessage();
ap_log('ERROR FOLLOWING', $e->getMessage());
}
ap_log('FOLLOW', json_encode([$actor['inbox'], $info, $accept_data], JSON_PRETTY_PRINT));
} elseif(mb_strtolower($data['type']) == 'like') {
// like/favorite
ap_log('LIKE', json_encode([$actor['inbox'], $info, $data], JSON_PRETTY_PRINT));
$post_id = activitypub_post_from_url($data['object']);
activitypub_do('like', $actor['preferredUsername'], $info['host'], $post_id);
} elseif(mb_strtolower($data['type']) == 'announce') {
// boost
ap_log('ANNOUNCE/BOOST', json_encode([$actor['inbox'], $info, $data], JSON_PRETTY_PRINT));
$post_id = activitypub_post_from_url($data['object']);
activitypub_do('announce', $actor['preferredUsername'], $info['host'], $post_id);
} elseif(mb_strtolower($data['type']) == 'undo') {
if(mb_strtolower($data['object']['type']) == 'follow') {
// undo follow
ap_log('UNDO FOLLOW', json_encode([$plaintext]));
// remove from db
$follower = [
'name' => $actor['preferredUsername'],
'host' => $info['host']
];
try {
$statement = $db->prepare('DELETE FROM followers WHERE follower_name = :name AND follower_host = :host');
$statement->bindValue(':name', $follower['name'], PDO::PARAM_STR);
$statement->bindValue(':host', $follower['host'], PDO::PARAM_STR);
$statement->execute();
} catch(PDOException $e) {
print 'Exception : '.$e->getMessage();
ap_log('ERROR UNFOLLOWING', $e->getMessage());
}
} elseif(mb_strtolower($data['object']['type']) == 'like') {
// undo like
$post_id = activitypub_post_from_url($data['object']['object']);
activitypub_undo('like', $actor['preferredUsername'], $info['host'], $post_id);
ap_log('UNDO LIKE', json_encode([$actor['inbox'], $info, $data], JSON_PRETTY_PRINT));
} elseif(mb_strtolower($data['object']['type']) == 'announce') {
// undo boost
$post_id = activitypub_post_from_url($data['object']['object']);
activitypub_undo('announce', $actor['preferredUsername'], $info['host'], $post_id);
ap_log('UNDO ANNOUNCE/BOOST', json_encode([$actor['inbox'], $info, $data], JSON_PRETTY_PRINT));
}
} elseif(mb_strtolower($data['type']) == 'delete') {
// user is to be deleted and all references removed or replaced by Tombstone
// https://www.w3.org/TR/activitypub/#delete-activity-inbox
ap_log('DELETE 1', json_encode(['trying to delete', $data]));
activitypub_delete_user($actor['preferredUsername'], $info['host']);
ap_log('DELETE 2', json_encode([$actor['preferredUsername'], $info['host']]));
}
}
} else {
if(file_exists(ROOT.DS.'inbox-log.txt')) {
echo(nl2br(file_get_contents(ROOT.DS.'inbox-log.txt')));
} else {
echo('no inbox activity');
}
}
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