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AphrontHTTPSink.php
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AphrontHTTPSink.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Abstract class which wraps some sort of output mechanism for HTTP responses.
* Normally this is just @{class:AphrontPHPHTTPSink}, which uses "echo" and
* "header()" to emit responses.
*
* Mostly, this class allows us to do install security or metrics hooks in the
* output pipeline.
*
* @task write Writing Response Components
* @task emit Emitting the Response
*
* @group aphront
*/
abstract class AphrontHTTPSink {
/* -( Writing Response Components )---------------------------------------- */
/**
* Write an HTTP status code to the output.
*
* @param int Numeric HTTP status code.
* @return void
*/
final public function writeHTTPStatus($code) {
if (!preg_match('/^\d{3}$/', $code)) {
throw new Exception("Malformed HTTP status code '{$code}'!");
}
$code = (int)$code;
$this->emitHTTPStatus($code);
}
/**
* Write HTTP headers to the output.
*
* @param list<pair> List of <name, value> pairs.
* @return void
*/
final public function writeHeaders(array $headers) {
foreach ($headers as $header) {
if (!is_array($header) || count($header) !== 2) {
throw new Exception('Malformed header.');
}
list($name, $value) = $header;
if (strpos($name, ':') !== false) {
throw new Exception(
"Declining to emit response with malformed HTTP header name: ".
$name);
}
// Attackers may perform an "HTTP response splitting" attack by making
// the application emit certain types of headers containing newlines:
//
// http://en.wikipedia.org/wiki/HTTP_response_splitting
//
// PHP has built-in protections against HTTP response-splitting, but they
// are of dubious trustworthiness:
//
// http://news.php.net/php.internals/57655
if (preg_match('/[\r\n\0]/', $name.$value)) {
throw new Exception(
"Declining to emit response with unsafe HTTP header: ".
"<'".$name."', '".$value."'>.");
}
}
foreach ($headers as $header) {
list($name, $value) = $header;
$this->emitHeader($name, $value);
}
}
/**
* Write HTTP body data to the output.
*
* @param string Body data.
* @return void
*/
final public function writeData($data) {
$this->emitData($data);
}
/**
* Write an entire @{class:AphrontResponse} to the output.
*
* @param AphrontResponse The response object to write.
* @return void
*/
final public function writeResponse(AphrontResponse $response) {
$all_headers = array_merge(
$response->getHeaders(),
$response->getCacheHeaders());
$this->writeHTTPStatus($response->getHTTPResponseCode());
$this->writeHeaders($all_headers);
$this->writeData($response->buildResponseString());
}
/* -( Emitting the Response )---------------------------------------------- */
abstract protected function emitHTTPStatus($code);
abstract protected function emitHeader($name, $value);
abstract protected function emitData($data);
}

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