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PhabricatorEnv.php
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Sat, Nov 23, 06:45

PhabricatorEnv.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.
*/
/**
* Manages the execution environment configuration, exposing APIs to read
* configuration settings and other similar values that are derived directly
* from configuration settings.
*
*
* = Reading Configuration =
*
* The primary role of this class is to provide an API for reading
* Phabricator configuration, @{method:getEnvConfig}:
*
* $value = PhabricatorEnv::getEnvConfig('some.key', $default);
*
* The class also handles some URI construction based on configuration, via
* the methods @{method:getURI}, @{method:getProductionURI},
* @{method:getCDNURI}, and @{method:getDoclink}.
*
* For configuration which allows you to choose a class to be responsible for
* some functionality (e.g., which mail adapter to use to deliver email),
* @{method:newObjectFromConfig} provides a simple interface that validates
* the configured value.
*
*
* = Unit Test Support =
*
* In unit tests, you can use @{method:beginScopedEnv} to create a temporary,
* mutable environment. The method returns a scope guard object which restores
* the environment when it is destroyed. For example:
*
* public function testExample() {
* $env = PhabricatorEnv::beginScopedEnv();
* $env->overrideEnv('some.key', 'new-value-for-this-test');
*
* // Some test which depends on the value of 'some.key'.
*
* }
*
* Your changes will persist until the `$env` object leaves scope or is
* destroyed.
*
* You should //not// use this in normal code.
*
*
* @task read Reading Configuration
* @task uri URI Validation
* @task test Unit Test Support
* @task internal Internals
*/
final class PhabricatorEnv {
private static $env;
private static $stack = array();
/* -( Reading Configuration )---------------------------------------------- */
/**
* Get the current configuration setting for a given key.
*
* @task read
*/
public static function getEnvConfig($key, $default = null) {
// If we have environment overrides via beginScopedEnv(), check them for
// the key first.
if (self::$stack) {
foreach (array_reverse(self::$stack) as $override) {
if (array_key_exists($key, $override)) {
return $override[$key];
}
}
}
return idx(self::$env, $key, $default);
}
/**
* Get the fully-qualified URI for a path.
*
* @task read
*/
public static function getURI($path) {
return rtrim(self::getEnvConfig('phabricator.base-uri'), '/').$path;
}
/**
* Get the fully-qualified production URI for a path.
*
* @task read
*/
public static function getProductionURI($path) {
// If we're passed a URI which already has a domain, simply return it
// unmodified. In particular, files may have URIs which point to a CDN
// domain.
$uri = new PhutilURI($path);
if ($uri->getDomain()) {
return $path;
}
$production_domain = self::getEnvConfig('phabricator.production-uri');
if (!$production_domain) {
$production_domain = self::getEnvConfig('phabricator.base-uri');
}
return rtrim($production_domain, '/').$path;
}
/**
* Get the fully-qualified production URI for a static resource path.
*
* @task read
*/
public static function getCDNURI($path) {
$alt = self::getEnvConfig('security.alternate-file-domain');
if (!$alt) {
$alt = self::getEnvConfig('phabricator.base-uri');
}
$uri = new PhutilURI($alt);
$uri->setPath($path);
return (string)$uri;
}
/**
* Get the fully-qualified production URI for a documentation resource.
*
* @task read
*/
public static function getDoclink($resource) {
return 'http://www.phabricator.com/docs/phabricator/'.$resource;
}
/**
* Build a concrete object from a configuration key.
*
* @task read
*/
public static function newObjectFromConfig($key, $args = array()) {
$class = self::getEnvConfig($key);
$object = newv($class, $args);
$instanceof = idx(self::getRequiredClasses(), $key);
if (!($object instanceof $instanceof)) {
throw new Exception("Config setting '$key' must be an instance of ".
"'$instanceof', is '".get_class($object)."'.");
}
return $object;
}
/* -( Unit Test Support )-------------------------------------------------- */
/**
* @task test
*/
public static function beginScopedEnv() {
return new PhabricatorScopedEnv(self::pushEnvironment());
}
/**
* @task test
*/
private static function pushEnvironment() {
self::$stack[] = array();
return last_key(self::$stack);
}
/**
* @task test
*/
public static function popEnvironment($key) {
$stack_key = last_key(self::$stack);
array_pop(self::$stack);
if ($stack_key !== $key) {
throw new Exception(
"Scoped environments were destroyed in a diffent order than they ".
"were initialized.");
}
}
/* -( URI Validation )----------------------------------------------------- */
/**
* Detect if a URI satisfies either @{method:isValidLocalWebResource} or
* @{method:isValidRemoteWebResource}, i.e. is a page on this server or the
* URI of some other resource which has a valid protocol. This rejects
* garbage URIs and URIs with protocols which do not appear in the
* ##uri.allowed-protocols## configuration, notably 'javascript:' URIs.
*
* NOTE: This method is generally intended to reject URIs which it may be
* unsafe to put in an "href" link attribute.
*
* @param string URI to test.
* @return bool True if the URI identifies a web resource.
* @task uri
*/
public static function isValidWebResource($uri) {
return self::isValidLocalWebResource($uri) ||
self::isValidRemoteWebResource($uri);
}
/**
* Detect if a URI identifies some page on this server.
*
* NOTE: This method is generally intended to reject URIs which it may be
* unsafe to issue a "Location:" redirect to.
*
* @param string URI to test.
* @return bool True if the URI identifies a local page.
* @task uri
*/
public static function isValidLocalWebResource($uri) {
$uri = (string)$uri;
if (!strlen($uri)) {
return false;
}
if (preg_match('/\s/', $uri)) {
// PHP hasn't been vulnerable to header injection attacks for a bunch of
// years, but we can safely reject these anyway since they're never valid.
return false;
}
// Valid URIs must begin with '/', followed by the end of the string or some
// other non-'/' character. This rejects protocol-relative URIs like
// "//evil.com/evil_stuff/".
return (bool)preg_match('@^/([^/]|$)@', $uri);
}
/**
* Detect if a URI identifies some valid remote resource.
*
* @param string URI to test.
* @return bool True if a URI idenfies a remote resource with an allowed
* protocol.
* @task uri
*/
public static function isValidRemoteWebResource($uri) {
$uri = (string)$uri;
$proto = id(new PhutilURI($uri))->getProtocol();
if (!$proto) {
return false;
}
$allowed = self::getEnvConfig('uri.allowed-protocols');
if (empty($allowed[$proto])) {
return false;
}
return true;
}
/* -( Internals )---------------------------------------------------------- */
/**
* @task internal
*/
public static function setEnvConfig(array $config) {
self::$env = $config;
}
/**
* @task internal
*/
public static function getRequiredClasses() {
return array(
'translation.provider' => 'PhabricatorTranslation',
'metamta.mail-adapter' => 'PhabricatorMailImplementationAdapter',
'metamta.maniphest.reply-handler' => 'PhabricatorMailReplyHandler',
'metamta.differential.reply-handler' => 'PhabricatorMailReplyHandler',
'metamta.diffusion.reply-handler' => 'PhabricatorMailReplyHandler',
'metamta.package.reply-handler' => 'PhabricatorMailReplyHandler',
'storage.engine-selector' => 'PhabricatorFileStorageEngineSelector',
'search.engine-selector' => 'PhabricatorSearchEngineSelector',
'differential.field-selector' => 'DifferentialFieldSelector',
'maniphest.custom-task-extensions-class' => 'ManiphestTaskExtensions',
'aphront.default-application-configuration-class' =>
'AphrontApplicationConfiguration',
'controller.oauth-registration' =>
'PhabricatorOAuthRegistrationController',
'mysql.implementation' => 'AphrontMySQLDatabaseConnectionBase',
'differential.attach-task-class' => 'DifferentialTasksAttacher',
'mysql.configuration-provider' => 'DatabaseConfigurationProvider',
'syntax-highlighter.engine' => 'PhutilSyntaxHighlighterEngine',
);
}
/**
* @task internal
*/
public static function envConfigExists($key) {
return array_key_exists($key, self::$env);
}
/**
* @task internal
*/
public static function getAllConfigKeys() {
return self::$env;
}
/**
* @task internal
*/
public static function overrideEnvConfig($stack_key, $key, $value) {
self::$stack[$stack_key][$key] = $value;
}
}

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