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AphrontResponse.php
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Tue, Nov 26, 10:49

AphrontResponse.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.
*/
/**
* @group aphront
*/
abstract class AphrontResponse {
private $request;
private $cacheable = false;
private $responseCode = 200;
private $lastModified = null;
protected $frameable;
public function setRequest($request) {
$this->request = $request;
return $this;
}
public function getRequest() {
return $this->request;
}
public function getHeaders() {
$headers = array();
if (!$this->frameable) {
$headers[] = array('X-Frame-Options', 'Deny');
}
return $headers;
}
public function setCacheDurationInSeconds($duration) {
$this->cacheable = $duration;
return $this;
}
public function setLastModified($epoch_timestamp) {
$this->lastModified = $epoch_timestamp;
return $this;
}
public function setHTTPResponseCode($code) {
$this->responseCode = $code;
return $this;
}
public function getHTTPResponseCode() {
return $this->responseCode;
}
public function setFrameable($frameable) {
$this->frameable = $frameable;
return $this;
}
protected function encodeJSONForHTTPResponse(array $object) {
$response = json_encode($object);
// Prevent content sniffing attacks by encoding "<" and ">", so browsers
// won't try to execute the document as HTML even if they ignore
// Content-Type and X-Content-Type-Options. See T865.
$response = str_replace(
array('<', '>'),
array('\u003c', '\u003e'),
$response);
return $response;
}
protected function addJSONShield($json_response, $use_javelin_shield) {
// Add a shield to prevent "JSON Hijacking" attacks where an attacker
// requests a JSON response using a normal <script /> tag and then uses
// Object.prototype.__defineSetter__() or similar to read response data.
// This header causes the browser to loop infinitely instead of handing over
// sensitive data.
// TODO: This is massively stupid: Javelin and Conduit use different
// shields.
$shield = $use_javelin_shield
? 'for (;;);'
: 'for(;;);';
$response = $shield.$json_response;
return $response;
}
public function getCacheHeaders() {
$headers = array();
if ($this->cacheable) {
$headers[] = array(
'Expires',
$this->formatEpochTimestampForHTTPHeader(time() + $this->cacheable));
} else {
$headers[] = array(
'Cache-Control',
'private, no-cache, no-store, must-revalidate');
$headers[] = array(
'Pragma',
'no-cache');
$headers[] = array(
'Expires',
'Sat, 01 Jan 2000 00:00:00 GMT');
}
if ($this->lastModified) {
$headers[] = array(
'Last-Modified',
$this->formatEpochTimestampForHTTPHeader($this->lastModified));
}
// IE has a feature where it may override an explicit Content-Type
// declaration by inferring a content type. This can be a security risk
// and we always explicitly transmit the correct Content-Type header, so
// prevent IE from using inferred content types. This only offers protection
// on recent versions of IE; IE6/7 and Opera currently ignore this header.
$headers[] = array('X-Content-Type-Options', 'nosniff');
return $headers;
}
private function formatEpochTimestampForHTTPHeader($epoch_timestamp) {
return gmdate('D, d M Y H:i:s', $epoch_timestamp).' GMT';
}
abstract public function buildResponseString();
}

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