AphrontApplicationConfiguration.php
d1842929afaastable

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);
			}

			}

phab/src/aphront/configuration/AphrontApplicationConfiguration.phpd1842929afaastable

AphrontApplicationConfiguration.phpView Options

phab/src/aphront/configuration/AphrontApplicationConfiguration.php
d1842929afaastable

AphrontApplicationConfiguration.php
View Options