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<?php
namespace Telegraph;
use ORM, Exception;
use IndieWeb\MentionClient;
class Webmention {
private static $http = false;
// Returns false if the target URL is known to not accept webmentions
public static function isProbablySupported($targetURL) {
// Reject links that are known to not accept webmentions
$host = str_replace('www.','',parse_url($targetURL, PHP_URL_HOST));
if(!$host) return false;
$unsupported = [
'twitter.com',
'instagram.com',
'facebook.com',
];
if(in_array($host, $unsupported))
return false;
if(preg_match('/.+\.amazonaws\.com/', $host))
return false;
return true;
}
private static function updateStatus($webmention, $http_code, $code, $raw=null) {
$status = ORM::for_table('webmention_status')->create();
$status->webmention_id = $webmention->id;
$status->created_at = date('Y-m-d H:i:s');
if($http_code)
$status->http_code = $http_code;
$status->status = $code;
if($raw)
$status->raw_response = $raw;
$status->save();
// Post to the callback URL if one is set
if($webmention->callback) {
$payload = [
'source' => $webmention->source,
'target' => $webmention->target,
'status' => $code,
];
if($webmention->webmention_endpoint) {
$payload['type'] = 'webmention';
} elseif($webmention->pingback_endpoint) {
$payload['type'] = 'pingback';
}
if($status->http_code) {
$payload['http_code'] = $status->http_code;
}
if($raw) {
$payload['http_body'] = $raw;
}
return self::$http->post($webmention->callback, $payload);
}
}
public static function send($id, $client=false, $http=false) {
initdb();
$webmention = ORM::for_table('webmentions')->where('id', $id)->find_one();
if(!$webmention) {
echo 'Webmention '.$id.' was not found'."\n";
return;
}
if(!$client)
$client = new MentionClient();
if(!$http)
$http = new HTTP();
self::$http = $http;
// Discover the webmention or pingback endpoint
$endpoint = $client->discoverWebmentionEndpoint($webmention->target);
if(!$endpoint) {
// If no webmention endpoint found, try to send a pingback
$pingbackEndpoint = $client->discoverPingbackEndpoint($webmention->target);
// If no pingback endpoint was found, we can't do anything else
if(!$pingbackEndpoint) {
return self::updateStatus($webmention, null, 'not_supported');
}
$webmention->pingback_endpoint = $pingbackEndpoint;
$webmention->save();
$success = $client->sendPingbackToEndpoint($pingbackEndpoint, $webmention->source, $webmention->target);
return self::updateStatus($webmention, null, ($success ? 'accepted' : 'error'));
}
// There is a webmention endpoint, send the webmention now
$webmention->webmention_endpoint = $endpoint;
$webmention->save();
$params = [];
if($webmention->code) {
$params['code'] = $webmention->code;
if($webmention->realm)
$params['realm'] = $webmention->realm;
}
if($webmention->vouch) {
$params['vouch'] = $webmention->vouch;
}
$response = $client->sendWebmentionToEndpoint($endpoint, $webmention->source, $webmention->target, $params);
if(in_array($response['code'], [200,201,202])) {
$status = 'accepted';
$webmention->complete = $response['code'] == 200 ? 1 : 0;
// Check if the endpoint returned a status URL
if(array_key_exists('Location', $response['headers'])) {
$webmention->webmention_status_url = \Mf2\resolveUrl($endpoint, $response['headers']['Location']);
// TODO: queue a job to poll the endpoint for updates and deliver to the callback URL
} else {
// No status URL was returned, so we can't follow up with this later. Mark as complete.
$webmention->complete = 1;
}
} else {
$webmention->complete = 1;
$status = 'error';
}
$webmention->save();
$result = self::updateStatus($webmention, $response['code'], $status, $response['body']);
$pdo = ORM::get_db();
$pdo = null;
return $result;
}
}