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<?php
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
class Token {
public $http;
private $_pretty = false;
public function __construct() {
$this->http = new p3k\HTTP();
}
public function token(Request $request, Response $response) {
if($request->get('pretty')) {
$this->_pretty = true;
}
$source = $request->get('source');
$code = $request->get('code');
if(!$source) {
return $this->respond($response, 400, [
'error' => 'invalid_request',
'error_description' => 'Provide a source URL'
]);
}
if(!$code) {
return $this->respond($response, 400, [
'error' => 'invalid_request',
'error_description' => 'Provide an authorization code'
]);
}
$scheme = parse_url($source, PHP_URL_SCHEME);
if(!in_array($scheme, ['http','https'])) {
return $this->respond($response, 400, [
'error' => 'invalid_url',
'error_description' => 'Only http and https URLs are supported'
]);
}
// First try to discover the token endpoint
$head = $this->http->head($source);
if(!array_key_exists('Link', $head['headers'])) {
return $this->respond($response, 200, [
'error' => 'no_token_endpoint',
'error_description' => 'No Link headers were returned'
]);
}
if(is_string($head['headers']['Link']))
$head['headers']['Link'] = [$head['headers']['Link']];
$rels = p3k\HTTP::link_rels($head['headers']);
$endpoint = false;
if(array_key_exists('token_endpoint', $rels)) {
$endpoint = $rels['token_endpoint'][0];
} elseif(array_key_exists('oauth2-token', $rels)) {
$endpoint = $rels['oauth2-token'][0];
}
if(!$endpoint) {
return $this->respond($response, 200, [
'error' => 'no_token_endpoint',
'error_description' => 'No token endpoint was found in the headers'
]);
}
// Resolve the endpoint URL relative to the source URL
$endpoint = \mf2\resolveUrl($source, $endpoint);
// Now exchange the code for a token
$token = $this->http->post($endpoint, [
'grant_type' => 'authorization_code',
'code' => $code
]);
// Catch HTTP errors here such as timeouts
if($token['error']) {
return $this->respond($response, 200, [
'error' => $token['error'],
'error_description' => $token['error_description'] ?: 'An unknown error occurred trying to fetch the token'
]);
}
// Otherwise pass through the response from the token endpoint
$body = @json_decode($token['body']);
// Pass through the content type if we were not able to decode the response as JSON
$headers = [];
if(!$body && isset($token['headers']['Content-Type'])) {
$headers['Content-Type'] = $token['headers']['Content-Type'];
}
return $this->respond($response, 200, $body ?: $token['body'], $headers);
}
private function respond(Response $response, $code, $params, $headers=[]) {
$response->setStatusCode($code);
foreach($headers as $k=>$v) {
$response->headers->set($k, $v);
}
if(is_array($params) || is_object($params)) {
$response->headers->set('Content-Type', 'application/json');
$opts = JSON_UNESCAPED_SLASHES;
if($this->_pretty) $opts += JSON_PRETTY_PRINT;
$response->setContent(json_encode($params, $opts)."\n");
} else {
$response->setContent($params);
}
return $response;
}
}