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PhutilHTTPEngineExtension.php
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Wed, Feb 19, 20:48

PhutilHTTPEngineExtension.php
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<?php
/**
* Extend HTTP behavior by injecting proxies or compromising SSL.
*
* @task info Extension Information
* @task config Configuring HTTP Behavior
*/
abstract class PhutilHTTPEngineExtension
extends Phobject {
/**
* Human-readable name of this HTTP extension.
*
* @return string Human readable name.
* @task info
*/
abstract public function getExtensionName();
/**
* Return `true` to disable SSL authority verification for a URI.
*
* By default, certificates must be signed by a recognized authority and
* requests fail if the host provides an invalid certificate. You can
* override this behavior to accept any certificate (including self-signed
* certificates). Doing this compromises the security of SSL.
*
* @return bool Return `true` to disable authority verification.
* @task config
*/
public function shouldTrustAnySSLAuthorityForURI(PhutilURI $uri) {
return false;
}
/**
* Return `true` to disable SSL hostname verification for a URI.
*
* By default, certificates should be signed for the correct hostname,
* and requests fail if the host provides a certificate for a different
* hostname. You can override this behavior to accept any certificate,
* including certificates for a different host. Doing this compromises
* the security of SSL.
*
* @return bool Return `true` to disable hostname verification.
* @task config
*/
public function shouldTrustAnySSLHostnameForURI(PhutilURI $uri) {
return false;
}
/**
* Return a @{class:PhutilURI} to proxy requests.
*
* If some or all outbound HTTP requests must be proxied, you can return
* the URI for a proxy to use from this method.
*
* @return null|PhutilURI Proxy URI.
* @task config
*/
public function getHTTPProxyURI(PhutilURI $uri) {
return null;
}
final public function getExtensionKey() {
return $this->getPhobjectClassConstant('EXTENSIONKEY');
}
final public static function getAllExtensions() {
return id(new PhutilClassMapQuery())
->setAncestorClass(__CLASS__)
->setUniqueMethod('getExtensionKey')
->execute();
}
final public static function getExtension($key) {
$extensions = self::getAllExtensions();
return idx($extensions, $key);
}
final public static function requireExtension($key) {
$extension = self::getExtension($key);
if (!$extension) {
throw new Exception(
pht(
'No HTTP engine extension exists with extension key "%s".',
$key));
}
return $extension;
}
final public static function buildHTTPProxyURI(PhutilURI $uri) {
$proxy = null;
$via = null;
$extensions = self::getAllExtensions();
foreach ($extensions as $extension) {
$extension_proxy = $extension->getHTTPProxyURI($uri);
if ($extension_proxy === null) {
continue;
}
if (!($extension_proxy instanceof PhutilURI)) {
throw new Exception(
pht(
'HTTP extension "%s" (of class "%s") returned an invalid '.
'result from "%s": expected null, or an object of class "%s".',
$extension->getExtensionName(),
get_class($extension),
'getHTTPProxyURI()',
'PhutilURI'));
}
if ($proxy) {
throw new Exception(
pht(
'Two different HTTP extensions ("%s" of class "%s" and "%s" of '.
'class "%s") both provided a proxy URI for URI "%s". No more '.
'than one extension may provide a proxy for any URI.',
$extension->getExtensionName(),
get_class($extension),
$via->getExtensionName(),
get_class($via),
(string)$uri));
}
$proxy = $extension_proxy;
$via = $extension;
}
return $proxy;
}
}

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