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