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AphrontApplicationConfiguration.php
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Sat, Nov 30, 11:16

AphrontApplicationConfiguration.php
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<?php
/**
* @task routing URI Routing
* @task response Response Handling
* @task exception Exception Handling
*/
abstract class AphrontApplicationConfiguration extends Phobject {
private $request;
private $host;
private $path;
private $console;
abstract public function buildRequest();
abstract public function build404Controller();
abstract public function buildRedirectController($uri, $external);
final public function setRequest(AphrontRequest $request) {
$this->request = $request;
return $this;
}
final public function getRequest() {
return $this->request;
}
final public function getConsole() {
return $this->console;
}
final public function setConsole($console) {
$this->console = $console;
return $this;
}
final public function setHost($host) {
$this->host = $host;
return $this;
}
final public function getHost() {
return $this->host;
}
final public function setPath($path) {
$this->path = $path;
return $this;
}
final public function getPath() {
return $this->path;
}
public function willBuildRequest() {}
/**
* @phutil-external-symbol class PhabricatorStartup
*/
public static function runHTTPRequest(AphrontHTTPSink $sink) {
if (isset($_SERVER['HTTP_X_PHABRICATOR_SELFCHECK'])) {
$response = self::newSelfCheckResponse();
return self::writeResponse($sink, $response);
}
PhabricatorStartup::beginStartupPhase('multimeter');
$multimeter = MultimeterControl::newInstance();
$multimeter->setEventContext('<http-init>');
$multimeter->setEventViewer('<none>');
// Build a no-op write guard for the setup phase. We'll replace this with a
// real write guard later on, but we need to survive setup and build a
// request object first.
$write_guard = new AphrontWriteGuard('id');
PhabricatorStartup::beginStartupPhase('preflight');
$response = PhabricatorSetupCheck::willPreflightRequest();
if ($response) {
return self::writeResponse($sink, $response);
}
PhabricatorStartup::beginStartupPhase('env.init');
try {
PhabricatorEnv::initializeWebEnvironment();
$database_exception = null;
} catch (PhabricatorClusterStrandedException $ex) {
$database_exception = $ex;
}
if ($database_exception) {
$issue = PhabricatorSetupIssue::newDatabaseConnectionIssue(
$database_exception,
true);
$response = PhabricatorSetupCheck::newIssueResponse($issue);
return self::writeResponse($sink, $response);
}
$multimeter->setSampleRate(
PhabricatorEnv::getEnvConfig('debug.sample-rate'));
$debug_time_limit = PhabricatorEnv::getEnvConfig('debug.time-limit');
if ($debug_time_limit) {
PhabricatorStartup::setDebugTimeLimit($debug_time_limit);
}
// This is the earliest we can get away with this, we need env config first.
PhabricatorStartup::beginStartupPhase('log.access');
PhabricatorAccessLog::init();
$access_log = PhabricatorAccessLog::getLog();
PhabricatorStartup::setAccessLog($access_log);
$address = PhabricatorEnv::getRemoteAddress();
if ($address) {
$address_string = $address->getAddress();
} else {
$address_string = '-';
}
$access_log->setData(
array(
'R' => AphrontRequest::getHTTPHeader('Referer', '-'),
'r' => $address_string,
'M' => idx($_SERVER, 'REQUEST_METHOD', '-'),
));
DarkConsoleXHProfPluginAPI::hookProfiler();
// We just activated the profiler, so we don't need to keep track of
// startup phases anymore: it can take over from here.
PhabricatorStartup::beginStartupPhase('startup.done');
DarkConsoleErrorLogPluginAPI::registerErrorHandler();
$response = PhabricatorSetupCheck::willProcessRequest();
if ($response) {
return self::writeResponse($sink, $response);
}
$host = AphrontRequest::getHTTPHeader('Host');
$path = $_REQUEST['__path__'];
switch ($host) {
default:
$config_key = 'aphront.default-application-configuration-class';
$application = PhabricatorEnv::newObjectFromConfig($config_key);
break;
}
$application->setHost($host);
$application->setPath($path);
$application->willBuildRequest();
$request = $application->buildRequest();
// Now that we have a request, convert the write guard into one which
// actually checks CSRF tokens.
$write_guard->dispose();
$write_guard = new AphrontWriteGuard(array($request, 'validateCSRF'));
// Build the server URI implied by the request headers. If an administrator
// has not configured "phabricator.base-uri" yet, we'll use this to generate
// links.
$request_protocol = ($request->isHTTPS() ? 'https' : 'http');
$request_base_uri = "{$request_protocol}://{$host}/";
PhabricatorEnv::setRequestBaseURI($request_base_uri);
$access_log->setData(
array(
'U' => (string)$request->getRequestURI()->getPath(),
));
$processing_exception = null;
try {
$response = $application->processRequest(
$request,
$access_log,
$sink,
$multimeter);
$response_code = $response->getHTTPResponseCode();
} catch (Exception $ex) {
$processing_exception = $ex;
$response_code = 500;
}
$write_guard->dispose();
$access_log->setData(
array(
'c' => $response_code,
'T' => PhabricatorStartup::getMicrosecondsSinceStart(),
));
$multimeter->newEvent(
MultimeterEvent::TYPE_REQUEST_TIME,
$multimeter->getEventContext(),
PhabricatorStartup::getMicrosecondsSinceStart());
$access_log->write();
$multimeter->saveEvents();
DarkConsoleXHProfPluginAPI::saveProfilerSample($access_log);
// Add points to the rate limits for this request.
$rate_token = PhabricatorStartup::getRateLimitToken();
if ($rate_token !== null) {
// The base score for a request allows users to make 30 requests per
// minute.
$score = (1000 / 30);
// If the user was logged in, let them make more requests.
if ($request->getUser() && $request->getUser()->getPHID()) {
$score = $score / 5;
}
PhabricatorStartup::addRateLimitScore($rate_token, $score);
}
if ($processing_exception) {
throw $processing_exception;
}
}
public function processRequest(
AphrontRequest $request,
PhutilDeferredLog $access_log,
AphrontHTTPSink $sink,
MultimeterControl $multimeter) {
$this->setRequest($request);
list($controller, $uri_data) = $this->buildController();
$controller_class = get_class($controller);
$access_log->setData(
array(
'C' => $controller_class,
));
$multimeter->setEventContext('web.'.$controller_class);
$request->setController($controller);
$request->setURIMap($uri_data);
$controller->setRequest($request);
// If execution throws an exception and then trying to render that
// exception throws another exception, we want to show the original
// exception, as it is likely the root cause of the rendering exception.
$original_exception = null;
try {
$response = $controller->willBeginExecution();
if ($request->getUser() && $request->getUser()->getPHID()) {
$access_log->setData(
array(
'u' => $request->getUser()->getUserName(),
'P' => $request->getUser()->getPHID(),
));
$multimeter->setEventViewer('user.'.$request->getUser()->getPHID());
}
if (!$response) {
$controller->willProcessRequest($uri_data);
$response = $controller->handleRequest($request);
$this->validateControllerResponse($controller, $response);
}
} catch (Exception $ex) {
$original_exception = $ex;
$response = $this->handleThrowable($ex);
} catch (Throwable $ex) {
$original_exception = $ex;
$response = $this->handleThrowable($ex);
}
try {
$response = $this->produceResponse($request, $response);
$response = $controller->willSendResponse($response);
$response->setRequest($request);
self::writeResponse($sink, $response);
} catch (Exception $ex) {
if ($original_exception) {
throw $original_exception;
}
throw $ex;
}
return $response;
}
private static function writeResponse(
AphrontHTTPSink $sink,
AphrontResponse $response) {
$unexpected_output = PhabricatorStartup::endOutputCapture();
if ($unexpected_output) {
$unexpected_output = pht(
"Unexpected output:\n\n%s",
$unexpected_output);
phlog($unexpected_output);
if ($response instanceof AphrontWebpageResponse) {
$response->setUnexpectedOutput($unexpected_output);
}
}
$sink->writeResponse($response);
}
/* -( URI Routing )-------------------------------------------------------- */
/**
* Build a controller to respond to the request.
*
* @return pair<AphrontController,dict> Controller and dictionary of request
* parameters.
* @task routing
*/
final private function buildController() {
$request = $this->getRequest();
// If we're configured to operate in cluster mode, reject requests which
// were not received on a cluster interface.
//
// For example, a host may have an internal address like "170.0.0.1", and
// also have a public address like "51.23.95.16". Assuming the cluster
// is configured on a range like "170.0.0.0/16", we want to reject the
// requests received on the public interface.
//
// Ideally, nodes in a cluster should only be listening on internal
// interfaces, but they may be configured in such a way that they also
// listen on external interfaces, since this is easy to forget about or
// get wrong. As a broad security measure, reject requests received on any
// interfaces which aren't on the whitelist.
$cluster_addresses = PhabricatorEnv::getEnvConfig('cluster.addresses');
if ($cluster_addresses) {
$server_addr = idx($_SERVER, 'SERVER_ADDR');
if (!$server_addr) {
if (php_sapi_name() == 'cli') {
// This is a command line script (probably something like a unit
// test) so it's fine that we don't have SERVER_ADDR defined.
} else {
throw new AphrontMalformedRequestException(
pht('No %s', 'SERVER_ADDR'),
pht(
'Phabricator is configured to operate in cluster mode, but '.
'%s is not defined in the request context. Your webserver '.
'configuration needs to forward %s to PHP so Phabricator can '.
'reject requests received on external interfaces.',
'SERVER_ADDR',
'SERVER_ADDR'));
}
} else {
if (!PhabricatorEnv::isClusterAddress($server_addr)) {
throw new AphrontMalformedRequestException(
pht('External Interface'),
pht(
'Phabricator is configured in cluster mode and the address '.
'this request was received on ("%s") is not whitelisted as '.
'a cluster address.',
$server_addr));
}
}
}
$site = $this->buildSiteForRequest($request);
if ($site->shouldRequireHTTPS()) {
if (!$request->isHTTPS()) {
// Don't redirect intracluster requests: doing so drops headers and
// parameters, imposes a performance penalty, and indicates a
// misconfiguration.
if ($request->isProxiedClusterRequest()) {
throw new AphrontMalformedRequestException(
pht('HTTPS Required'),
pht(
'This request reached a site which requires HTTPS, but the '.
'request is not marked as HTTPS.'));
}
$https_uri = $request->getRequestURI();
$https_uri->setDomain($request->getHost());
$https_uri->setProtocol('https');
// In this scenario, we'll be redirecting to HTTPS using an absolute
// URI, so we need to permit an external redirect.
return $this->buildRedirectController($https_uri, true);
}
}
$maps = $site->getRoutingMaps();
$path = $request->getPath();
$result = $this->routePath($maps, $path);
if ($result) {
return $result;
}
// If we failed to match anything but don't have a trailing slash, try
// to add a trailing slash and issue a redirect if that resolves.
// NOTE: We only do this for GET, since redirects switch to GET and drop
// data like POST parameters.
if (!preg_match('@/$@', $path) && $request->isHTTPGet()) {
$result = $this->routePath($maps, $path.'/');
if ($result) {
$target_uri = $request->getAbsoluteRequestURI();
// We need to restore URI encoding because the webserver has
// interpreted it. For example, this allows us to redirect a path
// like `/tag/aa%20bb` to `/tag/aa%20bb/`, which may eventually be
// resolved meaningfully by an application.
$target_path = phutil_escape_uri($path.'/');
$target_uri->setPath($target_path);
$target_uri = (string)$target_uri;
return $this->buildRedirectController($target_uri, true);
}
}
$result = $site->new404Controller($request);
if ($result) {
return array($result, array());
}
return $this->build404Controller();
}
/**
* Map a specific path to the corresponding controller. For a description
* of routing, see @{method:buildController}.
*
* @param list<AphrontRoutingMap> List of routing maps.
* @param string Path to route.
* @return pair<AphrontController,dict> Controller and dictionary of request
* parameters.
* @task routing
*/
private function routePath(array $maps, $path) {
foreach ($maps as $map) {
$result = $map->routePath($path);
if ($result) {
return array($result->getController(), $result->getURIData());
}
}
}
private function buildSiteForRequest(AphrontRequest $request) {
$sites = PhabricatorSite::getAllSites();
$site = null;
foreach ($sites as $candidate) {
$site = $candidate->newSiteForRequest($request);
if ($site) {
break;
}
}
if (!$site) {
$path = $request->getPath();
$host = $request->getHost();
throw new AphrontMalformedRequestException(
pht('Site Not Found'),
pht(
'This request asked for "%s" on host "%s", but no site is '.
'configured which can serve this request.',
$path,
$host),
true);
}
$request->setSite($site);
return $site;
}
/* -( Response Handling )-------------------------------------------------- */
/**
* Tests if a response is of a valid type.
*
* @param wild Supposedly valid response.
* @return bool True if the object is of a valid type.
* @task response
*/
private function isValidResponseObject($response) {
if ($response instanceof AphrontResponse) {
return true;
}
if ($response instanceof AphrontResponseProducerInterface) {
return true;
}
return false;
}
/**
* Verifies that the return value from an @{class:AphrontController} is
* of an allowed type.
*
* @param AphrontController Controller which returned the response.
* @param wild Supposedly valid response.
* @return void
* @task response
*/
private function validateControllerResponse(
AphrontController $controller,
$response) {
if ($this->isValidResponseObject($response)) {
return;
}
throw new Exception(
pht(
'Controller "%s" returned an invalid response from call to "%s". '.
'This method must return an object of class "%s", or an object '.
'which implements the "%s" interface.',
get_class($controller),
'handleRequest()',
'AphrontResponse',
'AphrontResponseProducerInterface'));
}
/**
* Verifies that the return value from an
* @{class:AphrontResponseProducerInterface} is of an allowed type.
*
* @param AphrontResponseProducerInterface Object which produced
* this response.
* @param wild Supposedly valid response.
* @return void
* @task response
*/
private function validateProducerResponse(
AphrontResponseProducerInterface $producer,
$response) {
if ($this->isValidResponseObject($response)) {
return;
}
throw new Exception(
pht(
'Producer "%s" returned an invalid response from call to "%s". '.
'This method must return an object of class "%s", or an object '.
'which implements the "%s" interface.',
get_class($producer),
'produceAphrontResponse()',
'AphrontResponse',
'AphrontResponseProducerInterface'));
}
/**
* Verifies that the return value from an
* @{class:AphrontRequestExceptionHandler} is of an allowed type.
*
* @param AphrontRequestExceptionHandler Object which produced this
* response.
* @param wild Supposedly valid response.
* @return void
* @task response
*/
private function validateErrorHandlerResponse(
AphrontRequestExceptionHandler $handler,
$response) {
if ($this->isValidResponseObject($response)) {
return;
}
throw new Exception(
pht(
'Exception handler "%s" returned an invalid response from call to '.
'"%s". This method must return an object of class "%s", or an object '.
'which implements the "%s" interface.',
get_class($handler),
'handleRequestException()',
'AphrontResponse',
'AphrontResponseProducerInterface'));
}
/**
* Resolves a response object into an @{class:AphrontResponse}.
*
* Controllers are permitted to return actual responses of class
* @{class:AphrontResponse}, or other objects which implement
* @{interface:AphrontResponseProducerInterface} and can produce a response.
*
* If a controller returns a response producer, invoke it now and produce
* the real response.
*
* @param AphrontRequest Request being handled.
* @param AphrontResponse|AphrontResponseProducerInterface Response, or
* response producer.
* @return AphrontResponse Response after any required production.
* @task response
*/
private function produceResponse(AphrontRequest $request, $response) {
$original = $response;
// Detect cycles on the exact same objects. It's still possible to produce
// infinite responses as long as they're all unique, but we can only
// reasonably detect cycles, not guarantee that response production halts.
$seen = array();
while (true) {
// NOTE: It is permissible for an object to be both a response and a
// response producer. If so, being a producer is "stronger". This is
// used by AphrontProxyResponse.
// If this response is a valid response, hand over the request first.
if ($response instanceof AphrontResponse) {
$response->setRequest($request);
}
// If this isn't a producer, we're all done.
if (!($response instanceof AphrontResponseProducerInterface)) {
break;
}
$hash = spl_object_hash($response);
if (isset($seen[$hash])) {
throw new Exception(
pht(
'Failure while producing response for object of class "%s": '.
'encountered production cycle (identical object, of class "%s", '.
'was produced twice).',
get_class($original),
get_class($response)));
}
$seen[$hash] = true;
$new_response = $response->produceAphrontResponse();
$this->validateProducerResponse($response, $new_response);
$response = $new_response;
}
return $response;
}
/* -( Error Handling )----------------------------------------------------- */
/**
* Convert an exception which has escaped the controller into a response.
*
* This method delegates exception handling to available subclasses of
* @{class:AphrontRequestExceptionHandler}.
*
* @param Throwable Exception which needs to be handled.
* @return wild Response or response producer, or null if no available
* handler can produce a response.
* @task exception
*/
private function handleThrowable($throwable) {
$handlers = AphrontRequestExceptionHandler::getAllHandlers();
$request = $this->getRequest();
foreach ($handlers as $handler) {
if ($handler->canHandleRequestThrowable($request, $throwable)) {
$response = $handler->handleRequestThrowable($request, $throwable);
$this->validateErrorHandlerResponse($handler, $response);
return $response;
}
}
throw $throwable;
}
private static function newSelfCheckResponse() {
$path = idx($_REQUEST, '__path__', '');
$query = idx($_SERVER, 'QUERY_STRING', '');
$pairs = id(new PhutilQueryStringParser())
->parseQueryStringToPairList($query);
$params = array();
foreach ($pairs as $v) {
$params[] = array(
'name' => $v[0],
'value' => $v[1],
);
}
$result = array(
'path' => $path,
'params' => $params,
'user' => idx($_SERVER, 'PHP_AUTH_USER'),
'pass' => idx($_SERVER, 'PHP_AUTH_PW'),
// This just makes sure that the response compresses well, so reasonable
// algorithms should want to gzip or deflate it.
'filler' => str_repeat('Q', 1024 * 16),
);
return id(new AphrontJSONResponse())
->setAddJSONShield(false)
->setContent($result);
}
}

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