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AphrontRequest.php
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Fri, Dec 27, 08:38

AphrontRequest.php
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<?php
/**
*
* @task data Accessing Request Data
*
* @group aphront
*/
final class AphrontRequest {
// NOTE: These magic request-type parameters are automatically included in
// certain requests (e.g., by phabricator_form(), JX.Request,
// JX.Workflow, and ConduitClient) and help us figure out what sort of
// response the client expects.
const TYPE_AJAX = '__ajax__';
const TYPE_FORM = '__form__';
const TYPE_CONDUIT = '__conduit__';
const TYPE_WORKFLOW = '__wflow__';
const TYPE_CONTINUE = '__continue__';
const TYPE_PREVIEW = '__preview__';
private $host;
private $path;
private $requestData;
private $user;
private $applicationConfiguration;
final public function __construct($host, $path) {
$this->host = $host;
$this->path = $path;
}
final public function setApplicationConfiguration(
$application_configuration) {
$this->applicationConfiguration = $application_configuration;
return $this;
}
final public function getApplicationConfiguration() {
return $this->applicationConfiguration;
}
final public function setPath($path) {
$this->path = $path;
return $this;
}
final public function getPath() {
return $this->path;
}
final public function getHost() {
// The "Host" header may include a port number, or may be a malicious
// header in the form "realdomain.com:ignored@evil.com". Invoke the full
// parser to extract the real domain correctly. See here for coverage of
// a similar issue in Django:
//
// https://www.djangoproject.com/weblog/2012/oct/17/security/
$uri = new PhutilURI('http://'.$this->host);
return $uri->getDomain();
}
/* -( Accessing Request Data )--------------------------------------------- */
/**
* @task data
*/
final public function setRequestData(array $request_data) {
$this->requestData = $request_data;
return $this;
}
/**
* @task data
*/
final public function getRequestData() {
return $this->requestData;
}
/**
* @task data
*/
final public function getInt($name, $default = null) {
if (isset($this->requestData[$name])) {
return (int)$this->requestData[$name];
} else {
return $default;
}
}
/**
* @task data
*/
final public function getBool($name, $default = null) {
if (isset($this->requestData[$name])) {
if ($this->requestData[$name] === 'true') {
return true;
} else if ($this->requestData[$name] === 'false') {
return false;
} else {
return (bool)$this->requestData[$name];
}
} else {
return $default;
}
}
/**
* @task data
*/
final public function getStr($name, $default = null) {
if (isset($this->requestData[$name])) {
$str = (string)$this->requestData[$name];
// Normalize newline craziness.
$str = str_replace(
array("\r\n", "\r"),
array("\n", "\n"),
$str);
return $str;
} else {
return $default;
}
}
/**
* @task data
*/
final public function getArr($name, $default = array()) {
if (isset($this->requestData[$name]) &&
is_array($this->requestData[$name])) {
return $this->requestData[$name];
} else {
return $default;
}
}
/**
* @task data
*/
final public function getStrList($name, $default = array()) {
if (!isset($this->requestData[$name])) {
return $default;
}
$list = $this->getStr($name);
$list = preg_split('/[\s,]+/', $list, $limit = -1, PREG_SPLIT_NO_EMPTY);
return $list;
}
/**
* @task data
*/
final public function getExists($name) {
return array_key_exists($name, $this->requestData);
}
final public function getFileExists($name) {
return isset($_FILES[$name]) &&
(idx($_FILES[$name], 'error') !== UPLOAD_ERR_NO_FILE);
}
final public function isHTTPGet() {
return ($_SERVER['REQUEST_METHOD'] == 'GET');
}
final public function isHTTPPost() {
return ($_SERVER['REQUEST_METHOD'] == 'POST');
}
final public function isAjax() {
return $this->getExists(self::TYPE_AJAX);
}
final public function isJavelinWorkflow() {
return $this->getExists(self::TYPE_WORKFLOW);
}
final public function isConduit() {
return $this->getExists(self::TYPE_CONDUIT);
}
public static function getCSRFTokenName() {
return '__csrf__';
}
public static function getCSRFHeaderName() {
return 'X-Phabricator-Csrf';
}
final public function validateCSRF() {
$token_name = self::getCSRFTokenName();
$token = $this->getStr($token_name);
// No token in the request, check the HTTP header which is added for Ajax
// requests.
if (empty($token)) {
$token = self::getHTTPHeader(self::getCSRFHeaderName());
}
$valid = $this->getUser()->validateCSRFToken($token);
if (!$valid) {
// Add some diagnostic details so we can figure out if some CSRF issues
// are JS problems or people accessing Ajax URIs directly with their
// browsers.
if ($token) {
$token_info = "with an invalid CSRF token";
} else {
$token_info = "without a CSRF token";
}
if ($this->isAjax()) {
$more_info = "(This was an Ajax request, {$token_info}.)";
} else {
$more_info = "(This was a web request, {$token_info}.)";
}
// Give a more detailed explanation of how to avoid the exception
// in developer mode.
if (PhabricatorEnv::getEnvConfig('phabricator.developer-mode')) {
$more_info = $more_info .
"To avoid this error, use phabricator_form() to construct forms. " .
"If you are already using phabricator_form(), make sure the form " .
"'action' uses a relative URI (i.e., begins with a '/'). Forms " .
"using absolute URIs do not include CSRF tokens, to prevent " .
"leaking tokens to external sites.\n\n" .
"If this page performs writes which do not require CSRF " .
"protection (usually, filling caches or logging), you can use " .
"AphrontWriteGuard::beginScopedUnguardedWrites() to temporarily " .
"bypass CSRF protection while writing. You should use this only " .
"for writes which can not be protected with normal CSRF " .
"mechanisms.\n\n" .
"Some UI elements (like PhabricatorActionListView) also have " .
"methods which will allow you to render links as forms (like " .
"setRenderAsForm(true)).";
}
// This should only be able to happen if you load a form, pull your
// internet for 6 hours, and then reconnect and immediately submit,
// but give the user some indication of what happened since the workflow
// is incredibly confusing otherwise.
throw new AphrontCSRFException(
"The form you just submitted did not include a valid CSRF token. ".
"This token is a technical security measure which prevents a ".
"certain type of login hijacking attack. However, the token can ".
"become invalid if you leave a page open for more than six hours ".
"without a connection to the internet. To fix this problem: reload ".
"the page, and then resubmit it. All data inserted to the form will ".
"be lost in some browsers so copy them somewhere before reloading.\n\n".
$more_info);
}
return true;
}
final public function isFormPost() {
$post = $this->getExists(self::TYPE_FORM) &&
$this->isHTTPPost();
if (!$post) {
return false;
}
return $this->validateCSRF();
}
final public function getCookie($name, $default = null) {
return idx($_COOKIE, $name, $default);
}
final public function clearCookie($name) {
$this->setCookie($name, '', time() - (60 * 60 * 24 * 30));
unset($_COOKIE[$name]);
}
final public function setCookie($name, $value, $expire = null) {
$is_secure = false;
// If a base URI has been configured, ensure cookies are only set on that
// domain. Also, use the URI protocol to control SSL-only cookies.
$base_uri = PhabricatorEnv::getEnvConfig('phabricator.base-uri');
if ($base_uri) {
$alternates = PhabricatorEnv::getEnvConfig('phabricator.allowed-uris');
$allowed_uris = array_merge(
array($base_uri),
$alternates);
$host = $this->getHost();
$match = null;
foreach ($allowed_uris as $allowed_uri) {
$uri = new PhutilURI($allowed_uri);
$domain = $uri->getDomain();
if ($host == $domain) {
$match = $uri;
break;
}
}
if ($match === null) {
if (count($allowed_uris) > 1) {
throw new Exception(
pht(
'This Phabricator install is configured as "%s", but you are '.
'accessing it via "%s". Access Phabricator via the primary '.
'configured domain, or one of the permitted alternate '.
'domains: %s. Phabricator will not set cookies on other domains '.
'for security reasons.',
$base_uri,
$host,
implode(', ', $alternates)));
} else {
throw new Exception(
pht(
'This Phabricator install is configured as "%s", but you are '.
'accessing it via "%s". Acccess Phabricator via the primary '.
'configured domain. Phabricator will not set cookies on other '.
'domains for security reasons.',
$base_uri,
$host));
}
}
$base_domain = $match->getDomain();
$is_secure = ($match->getProtocol() == 'https');
} else {
$base_uri = new PhutilURI(PhabricatorEnv::getRequestBaseURI());
$base_domain = $base_uri->getDomain();
}
if ($expire === null) {
$expire = time() + (60 * 60 * 24 * 365 * 5);
}
setcookie(
$name,
$value,
$expire,
$path = '/',
$base_domain,
$is_secure,
$http_only = true);
$_COOKIE[$name] = $value;
return $this;
}
final public function setUser($user) {
$this->user = $user;
return $this;
}
final public function getUser() {
return $this->user;
}
final public function getRequestURI() {
$get = $_GET;
unset($get['__path__']);
$path = phutil_escape_uri($this->getPath());
return id(new PhutilURI($path))->setQueryParams($get);
}
final public function isDialogFormPost() {
return $this->isFormPost() && $this->getStr('__dialog__');
}
final public function getRemoteAddr() {
return $_SERVER['REMOTE_ADDR'];
}
public function isHTTPS() {
if (empty($_SERVER['HTTPS'])) {
return false;
}
if (!strcasecmp($_SERVER["HTTPS"], "off")) {
return false;
}
return true;
}
public function isContinueRequest() {
return $this->isFormPost() && $this->getStr('__continue__');
}
public function isPreviewRequest() {
return $this->isFormPost() && $this->getStr('__preview__');
}
/**
* Get application request parameters in a flattened form suitable for
* inclusion in an HTTP request, excluding parameters with special meanings.
* This is primarily useful if you want to ask the user for more input and
* then resubmit their request.
*
* @return dict<string, string> Original request parameters.
*/
public function getPassthroughRequestParameters() {
return self::flattenData($this->getPassthroughRequestData());
}
/**
* Get request data other than "magic" parameters.
*
* @return dict<string, wild> Request data, with magic filtered out.
*/
public function getPassthroughRequestData() {
$data = $this->getRequestData();
// Remove magic parameters like __dialog__ and __ajax__.
foreach ($data as $key => $value) {
if (!strncmp($key, '__', 2)) {
unset($data[$key]);
}
}
return $data;
}
/**
* Flatten an array of key-value pairs (possibly including arrays as values)
* into a list of key-value pairs suitable for submitting via HTTP request
* (with arrays flattened).
*
* @param dict<string, wild> Data to flatten.
* @return dict<string, string> Flat data suitable for inclusion in an HTTP
* request.
*/
public static function flattenData(array $data) {
$result = array();
foreach ($data as $key => $value) {
if (is_array($value)) {
foreach (self::flattenData($value) as $fkey => $fvalue) {
$fkey = '['.preg_replace('/(?=\[)|$/', ']', $fkey, $limit = 1);
$result[$key.$fkey] = $fvalue;
}
} else {
$result[$key] = (string)$value;
}
}
ksort($result);
return $result;
}
public static function getHTTPHeader($name, $default = null) {
// PHP mangles HTTP headers by uppercasing them and replacing hyphens with
// underscores, then prepending 'HTTP_'.
$php_index = strtoupper($name);
$php_index = str_replace('-', '_', $php_index);
$php_index = 'HTTP_'.$php_index;
return idx($_SERVER, $php_index, $default);
}
}

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