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216 lines
6.5 KiB
216 lines
6.5 KiB
<?php
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use Symfony\Component\HttpFoundation\Request;
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use Symfony\Component\HttpFoundation\Response;
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class API {
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public $http;
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public function __construct() {
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$this->http = new Telegraph\HTTP();
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}
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private function respond(Response $response, $code, $params, $headers=[]) {
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$response->setStatusCode($code);
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foreach($headers as $k=>$v) {
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$response->headers->set($k, $v);
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}
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$response->headers->set('Content-Type', 'application/json');
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$response->setContent(json_encode($params));
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return $response;
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}
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private static function toHtmlEntities($input) {
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return mb_convert_encoding($input, 'HTML-ENTITIES', mb_detect_encoding($input));
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}
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private static function generateStatusToken() {
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$str = dechex(date('y'));
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$chs = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
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$len = strlen($chs);
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for($i = 0; $i < 16; $i++) {
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$str .= $chs[mt_rand(0, $len - 1)];
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}
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return $str;
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}
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public function webmention(Request $request, Response $response) {
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# Require the token parameter
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if(!$token=$request->get('token')) {
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return $this->respond($response, 401, [
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'error' => 'authentication_required',
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'error_description' => 'A token is required to use the API'
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]);
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}
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# Require source and target or target_domain parameters
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$target = $target_domain = null;
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if((!$source=$request->get('source')) || ((!$target=$request->get('target')) && (!$target_domain=$request->get('target_domain')))) {
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return $this->respond($response, 400, [
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'error' => 'missing_parameters',
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'error_description' => 'The source or target or target_domain parameters were missing'
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]);
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}
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if($target && $target_domain) {
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return $this->respond($response, 400, [
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'error' => 'invalid_parameter',
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'error_description' => 'Can\'t provide both target and target_domain together'
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]);
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}
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$urlregex = '/^https?:\/\/[^ ]+\.[^ ]+$/';
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$domainregex = '/^[^ ]+$/';
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# Verify source, target, and callback are URLs
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$callback = $request->get('callback');
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if(!preg_match($urlregex, $source) ||
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(!preg_match($urlregex, $target) && !preg_match($domainregex, $target_domain)) ||
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($callback && !preg_match($urlregex, $callback))) {
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return $this->respond($response, 400, [
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'error' => 'invalid_parameter',
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'error_description' => 'The source, target, or callback parameters were invalid'
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]);
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}
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# Verify the token is valid
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$role = ORM::for_table('roles')->where('token', $token)->find_one();
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if(!$role) {
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return $this->respond($response, 401, [
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'error' => 'invalid_token',
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'error_description' => 'The token provided is not valid'
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]);
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}
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# Synchronously check the source URL and verify that it actually contains
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# a link to the target. This way we prevent this API from sending known invalid mentions.
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$sourceData = $this->http->get($source);
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$doc = new DOMDocument();
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@$doc->loadHTML(self::toHtmlEntities($sourceData['body']));
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if(!$doc) {
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return $this->respond($response, 400, [
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'error' => 'source_not_html',
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'error_description' => 'The source document could not be parsed as HTML'
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]);
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}
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$xpath = new DOMXPath($doc);
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$found = [];
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foreach($xpath->query('//a[@href]') as $href) {
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$url = $href->getAttribute('href');
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$domain = parse_url($url, PHP_URL_HOST);
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if($url == $target || $domain == $target_domain ||
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# subdomain check
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($target_domain and $domain and substr_compare($domain, '.' . $target_domain, -(strlen($target_domain) + 1)) == 0)) {
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$found[$url] = null;
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}
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}
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if(!$found) {
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return $this->respond($response, 400, [
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'error' => 'no_link_found',
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'error_description' => 'The source document does not have a link to the target URL or domain'
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]);
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}
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# Everything checked out, so write the webmention to the log and queue a job to start sending
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# TODO: database transaction?
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$statusURLs = [];
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foreach($found as $url=>$_) {
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$w = ORM::for_table('webmentions')->create();
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$w->site_id = $role->site_id;
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$w->created_by = $role->user_id;
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$w->created_at = date('Y-m-d H:i:s');
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$w->token = self::generateStatusToken();
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$w->source = $source;
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$w->target = $url;
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$w->vouch = $request->get('vouch');
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$w->callback = $callback;
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$w->save();
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q()->queue('Telegraph\Webmention', 'send', [$w->id]);
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$statusURLs[] = Config::$base . 'webmention/' . $w->token;
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}
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if ($target) {
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$body = [
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'status' => 'queued',
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'location' => $statusURLs[0]
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];
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$headers = ['Location' => $statusURLs[0]];
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} else {
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$body = [
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'status' => 'queued',
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'location' => $statusURLs
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];
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$headers = [];
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}
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return $this->respond($response, 201, $body, $headers);
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}
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public function webmention_status(Request $request, Response $response, $args) {
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$webmention = ORM::for_table('webmentions')->where('token', $args['code'])->find_one();
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if(!$webmention) {
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return $this->respond($response, 404, [
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'status' => 'not_found',
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]);
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}
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$status = ORM::for_table('webmention_status')->where('webmention_id', $webmention->id)->order_by_desc('created_at')->find_one();
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$statusURL = Config::$base . 'webmention/' . $webmention->token;
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if(!$status) {
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$code = 'queued';
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} else {
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$code = $status->status;
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}
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$data = [
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'status' => $code,
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];
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if($webmention->webmention_endpoint) {
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$data['type'] = 'webmention';
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$data['endpoint'] = $webmention->webmention_endpoint;
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}
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if($webmention->pingback_endpoint) {
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$data['type'] = 'pingback';
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$data['endpoint'] = $webmention->pingback_endpoint;
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}
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switch($code) {
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case 'queued':
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$summary = 'The webmention is still in the processing queue';
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break;
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case 'not_supported':
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$summary = 'No webmention or pingback endpoint were found at the target';
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break;
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case 'accepted':
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$summary = 'The '.$data['type'].' request was accepted';
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break;
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default:
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$summary = false;
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}
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if($status && $status->http_code)
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$data['http_code'] = (int)$status->http_code;
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if($summary)
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$data['summary'] = $summary;
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if($webmention->complete == 0)
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$data['location'] = $statusURL;
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return $this->respond($response, 200, $data);
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}
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}
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