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<?php
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
class API {
public $http;
public function __construct() {
$this->http = new Telegraph\HTTP();
}
private function respond(Response $response, $code, $params, $headers=[]) {
$response->setStatusCode($code);
foreach($headers as $k=>$v) {
$response->headers->set($k, $v);
}
$response->setContent(json_encode($params));
return $response;
}
private static function toHtmlEntities($input) {
return mb_convert_encoding($input, 'HTML-ENTITIES', mb_detect_encoding($input));
}
private static function generateStatusToken() {
$str = dechex(date('y'));
$chs = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$len = strlen($chs);
for($i = 0; $i < 16; $i++) {
$str .= $chs[mt_rand(0, $len - 1)];
}
return $str;
}
public function webmention(Request $request, Response $response) {
# Require the token parameter
if(!$token=$request->get('token')) {
return $this->respond($response, 401, [
'error' => 'authentication_required',
'error_description' => 'A token is required to use the API'
]);
}
# Require source and target parameters
if((!$source=$request->get('source')) || (!$target=$request->get('target'))) {
return $this->respond($response, 400, [
'error' => 'missing_parameters',
'error_description' => 'The source or target parameters were missing'
]);
}
$urlregex = '/^https?:\/\/[^ ]+\.[^ ]+$/';
# Verify source and target are URLs
if(!preg_match($urlregex, $source) || !preg_match($urlregex, $target)) {
return $this->respond($response, 400, [
'error' => 'invalid_parameter',
'error_description' => 'The source or target parameters were invalid'
]);
}
# If a callback was provided, verify it is a URL
if($callback=$request->get('callback')) {
if(!preg_match($urlregex, $source) || !preg_match($urlregex, $target)) {
return $this->respond($response, 400, [
'error' => 'invalid_parameter',
'error_description' => 'The callback parameter was invalid'
]);
}
}
# Verify the token is valid
$role = ORM::for_table('roles')->where('token', $token)->find_one();
if(!$role) {
return $this->respond($response, 401, [
'error' => 'invalid_token',
'error_description' => 'The token provided is not valid'
]);
}
# Synchronously check the source URL and verify that it actually contains
# a link to the target. This way we prevent this API from sending known invalid mentions.
$sourceData = $this->http->get($source);
$doc = new DOMDocument();
@$doc->loadHTML(self::toHtmlEntities($sourceData['body']));
if(!$doc) {
return $this->respond($response, 400, [
'error' => 'source_not_html',
'error_description' => 'The source document could not be parsed as HTML'
]);
}
$xpath = new DOMXPath($doc);
$found = false;
foreach($xpath->query('//a[@href]') as $href) {
if($href->getAttribute('href') == $target) {
$found = true;
continue;
}
}
if(!$found) {
return $this->respond($response, 400, [
'error' => 'no_link_found',
'error_description' => 'The source document does not have a link to the target URL'
]);
}
# Everything checked out, so write the webmention to the log and queue a job to start sending
$w = ORM::for_table('webmentions')->create();
$w->site_id = $role->site_id;
$w->created_by = $role->user_id;
$w->created_at = date('Y-m-d H:i:s');
$w->token = self::generateStatusToken();
$w->source = $source;
$w->target = $target;
$w->vouch = $request->get('vouch');
$w->callback = $callback;
$w->save();
q()->queue('Telegraph\Webmention', 'send', [$w->id]);
$statusURL = Config::$base . 'webmention/' . $w->token;
return $this->respond($response, 201, [
'result' => 'queued',
'status' => $statusURL
], [
'Location' => $statusURL
]);
}
}