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phab/src/infrastructure/env/PhabricatorEnv.php
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PhabricatorEnv.php
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<?php
/**
* 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 $sourceStack;
private static $repairSource;
private static $overrideSource;
private static $requestBaseURI;
private static $cache;
/**
* @phutil-external-symbol class PhabricatorStartup
*/
public static function initializeWebEnvironment() {
self::initializeCommonEnvironment();
}
public static function initializeScriptEnvironment() {
self::initializeCommonEnvironment();
// NOTE: This is dangerous in general, but we know we're in a script context
// and are not vulnerable to CSRF.
AphrontWriteGuard::allowDangerousUnguardedWrites(true);
// There are several places where we log information (about errors, events,
// service calls, etc.) for analysis via DarkConsole or similar. These are
// useful for web requests, but grow unboundedly in long-running scripts and
// daemons. Discard data as it arrives in these cases.
PhutilServiceProfiler::getInstance()->enableDiscardMode();
DarkConsoleErrorLogPluginAPI::enableDiscardMode();
DarkConsoleEventPluginAPI::enableDiscardMode();
}
private static function initializeCommonEnvironment() {
PhutilErrorHandler::initialize();
self::buildConfigurationSourceStack();
// Force a valid timezone. If both PHP and Phabricator configuration are
// invalid, use UTC.
$tz = PhabricatorEnv::getEnvConfig('phabricator.timezone');
if ($tz) {
@date_default_timezone_set($tz);
}
$ok = @date_default_timezone_set(date_default_timezone_get());
if (!$ok) {
date_default_timezone_set('UTC');
}
// Prepend '/support/bin' and append any paths to $PATH if we need to.
$env_path = getenv('PATH');
$phabricator_path = dirname(phutil_get_library_root('phabricator'));
$support_path = $phabricator_path.'/support/bin';
$env_path = $support_path.PATH_SEPARATOR.$env_path;
$append_dirs = PhabricatorEnv::getEnvConfig('environment.append-paths');
if (!empty($append_dirs)) {
$append_path = implode(PATH_SEPARATOR, $append_dirs);
$env_path = $env_path.PATH_SEPARATOR.$append_path;
}
putenv('PATH='.$env_path);
// Write this back into $_ENV, too, so ExecFuture picks it up when creating
// subprocess environments.
$_ENV['PATH'] = $env_path;
PhabricatorEventEngine::initialize();
$translation = PhabricatorEnv::newObjectFromConfig('translation.provider');
PhutilTranslator::getInstance()
->setLanguage($translation->getLanguage())
->addTranslations($translation->getTranslations());
}
private static function buildConfigurationSourceStack() {
self::dropConfigCache();
$stack = new PhabricatorConfigStackSource();
self::$sourceStack = $stack;
$default_source = id(new PhabricatorConfigDefaultSource())
->setName(pht('Global Default'));
$stack->pushSource($default_source);
$env = self::getSelectedEnvironmentName();
if ($env) {
$stack->pushSource(
id(new PhabricatorConfigFileSource($env))
->setName(pht("File '%s'", $env)));
}
$stack->pushSource(
id(new PhabricatorConfigLocalSource())
->setName(pht('Local Config')));
// If the install overrides the database adapter, we might need to load
// the database adapter class before we can push on the database config.
// This config is locked and can't be edited from the web UI anyway.
foreach (PhabricatorEnv::getEnvConfig('load-libraries') as $library) {
phutil_load_library($library);
}
// If custom libraries specify config options, they won't get default
// values as the Default source has already been loaded, so we get it to
// pull in all options from non-phabricator libraries now they are loaded.
$default_source->loadExternalOptions();
try {
$stack->pushSource(
id(new PhabricatorConfigDatabaseSource('default'))
->setName(pht('Database')));
} catch (AphrontQueryException $exception) {
// If the database is not available, just skip this configuration
// source. This happens during `bin/storage upgrade`, `bin/conf` before
// schema setup, etc.
}
}
public static function repairConfig($key, $value) {
if (!self::$repairSource) {
self::$repairSource = id(new PhabricatorConfigDictionarySource(array()))
->setName(pht('Repaired Config'));
self::$sourceStack->pushSource(self::$repairSource);
}
self::$repairSource->setKeys(array($key => $value));
self::dropConfigCache();
}
public static function overrideConfig($key, $value) {
if (!self::$overrideSource) {
self::$overrideSource = id(new PhabricatorConfigDictionarySource(array()))
->setName(pht('Overridden Config'));
self::$sourceStack->pushSource(self::$overrideSource);
}
self::$overrideSource->setKeys(array($key => $value));
self::dropConfigCache();
}
public static function getUnrepairedEnvConfig($key, $default = null) {
foreach (self::$sourceStack->getStack() as $source) {
if ($source === self::$repairSource) {
continue;
}
$result = $source->getKeys(array($key));
if ($result) {
return $result[$key];
}
}
return $default;
}
public static function getSelectedEnvironmentName() {
$env_var = 'PHABRICATOR_ENV';
$env = idx($_SERVER, $env_var);
if (!$env) {
$env = getenv($env_var);
}
if (!$env) {
$env = idx($_ENV, $env_var);
}
if (!$env) {
$root = dirname(phutil_get_library_root('phabricator'));
$path = $root.'/conf/local/ENVIRONMENT';
if (Filesystem::pathExists($path)) {
$env = trim(Filesystem::readFile($path));
}
}
return $env;
}
public static function calculateEnvironmentHash() {
$keys = array_keys(self::getAllConfigKeys());
$values = array();
foreach ($keys as $key) {
$values[$key] = self::getEnvConfigIfExists($key);
}
return PhabricatorHash::digest(json_encode($values));
}
/* -( Reading Configuration )---------------------------------------------- */
/**
* Get the current configuration setting for a given key.
*
* If the key is not found, then throw an Exception.
*
* @task read
*/
public static function getEnvConfig($key) {
if (isset(self::$cache[$key])) {
return self::$cache[$key];
}
if (array_key_exists($key, self::$cache)) {
return self::$cache[$key];
}
$result = self::$sourceStack->getKeys(array($key));
if (array_key_exists($key, $result)) {
self::$cache[$key] = $result[$key];
return $result[$key];
} else {
throw new Exception("No config value specified for key '{$key}'.");
}
}
/**
* Get the current configuration setting for a given key. If the key
* does not exist, return a default value instead of throwing. This is
* primarily useful for migrations involving keys which are slated for
* removal.
*
* @task read
*/
public static function getEnvConfigIfExists($key, $default = null) {
try {
return self::getEnvConfig($key);
} catch (Exception $ex) {
return $default;
}
}
/**
* Get the fully-qualified URI for a path.
*
* @task read
*/
public static function getURI($path) {
return rtrim(self::getAnyBaseURI(), '/').$path;
}
/**
* Get the fully-qualified production URI for a path.
*
* @task read
*/
public static function getProductionURI($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) {
$production_domain = self::getAnyBaseURI();
}
return rtrim($production_domain, '/').$path;
}
public static function getAllowedURIs($path) {
$uri = new PhutilURI($path);
if ($uri->getDomain()) {
return $path;
}
$allowed_uris = self::getEnvConfig('phabricator.allowed-uris');
$return = array();
foreach ($allowed_uris as $allowed_uri) {
$return[] = rtrim($allowed_uri, '/').$path;
}
return $return;
}
/**
* Get the fully-qualified production URI for a static resource path.
*
* @task read
*/
public static function getCDNURI($path) {
$alt = self::getEnvConfig('security.alternate-file-domain');
if (!$alt) {
$alt = self::getAnyBaseURI();
}
$uri = new PhutilURI($alt);
$uri->setPath($path);
return (string)$uri;
}
/**
* Get the fully-qualified production URI for a documentation resource.
*
* @task read
*/
public static function getDoclink($resource, $type = 'article') {
$uri = new PhutilURI('https://secure.phabricator.com/diviner/find/');
$uri->setQueryParam('name', $resource);
$uri->setQueryParam('type', $type);
$uri->setQueryParam('jump', true);
return (string)$uri;
}
/**
* Build a concrete object from a configuration key.
*
* @task read
*/
public static function newObjectFromConfig($key, $args = array()) {
$class = self::getEnvConfig($key);
return newv($class, $args);
}
public static function getAnyBaseURI() {
$base_uri = self::getEnvConfig('phabricator.base-uri');
if (!$base_uri) {
$base_uri = self::getRequestBaseURI();
}
if (!$base_uri) {
throw new Exception(
"Define 'phabricator.base-uri' in your configuration to continue.");
}
return $base_uri;
}
public static function getRequestBaseURI() {
return self::$requestBaseURI;
}
public static function setRequestBaseURI($uri) {
self::$requestBaseURI = $uri;
}
/* -( Unit Test Support )-------------------------------------------------- */
/**
* @task test
*/
public static function beginScopedEnv() {
return new PhabricatorScopedEnv(self::pushTestEnvironment());
}
/**
* @task test
*/
private static function pushTestEnvironment() {
self::dropConfigCache();
$source = new PhabricatorConfigDictionarySource(array());
self::$sourceStack->pushSource($source);
return spl_object_hash($source);
}
/**
* @task test
*/
public static function popTestEnvironment($key) {
self::dropConfigCache();
$source = self::$sourceStack->popSource();
$stack_key = spl_object_hash($source);
if ($stack_key !== $key) {
self::$sourceStack->pushSource($source);
throw new Exception(
'Scoped environments were destroyed in a diffent order than they '.
'were initialized.');
}
}
/* -( URI Validation )----------------------------------------------------- */
/**
* Detect if a URI satisfies either @{method:isValidLocalWebResource} or
* @{method:isValidRemoteWebResource}, i.e. is a page on this server or the
* URI of some other resource which has a valid protocol. This rejects
* garbage URIs and URIs with protocols which do not appear in the
* ##uri.allowed-protocols## configuration, notably 'javascript:' URIs.
*
* NOTE: This method is generally intended to reject URIs which it may be
* unsafe to put in an "href" link attribute.
*
* @param string URI to test.
* @return bool True if the URI identifies a web resource.
* @task uri
*/
public static function isValidWebResource($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;
}
// Chrome (at a minimum) interprets backslashes in Location headers and the
// URL bar as forward slashes. This is probably intended to reduce user
// error caused by confusion over which key is "forward slash" vs "back
// slash".
//
// However, it means a URI like "/\evil.com" is interpreted like
// "//evil.com", which is a protocol relative remote URI.
//
// Since we currently never generate URIs with backslashes in them, reject
// these unconditionally rather than trying to figure out how browsers will
// interpret them.
if (preg_match('/\\\\/', $uri)) {
return false;
}
// Valid URIs must begin with '/', followed by the end of the string or some
// other non-'/' character. This rejects protocol-relative URIs like
// "//evil.com/evil_stuff/".
return (bool)preg_match('@^/([^/]|$)@', $uri);
}
/**
* Detect if a URI identifies some valid remote resource.
*
* @param string URI to test.
* @return bool True if a URI idenfies a remote resource with an allowed
* protocol.
* @task uri
*/
public static function isValidRemoteWebResource($uri) {
$uri = (string)$uri;
$proto = id(new PhutilURI($uri))->getProtocol();
if (!$proto) {
return false;
}
$allowed = self::getEnvConfig('uri.allowed-protocols');
if (empty($allowed[$proto])) {
return false;
}
return true;
}
/* -( Internals )---------------------------------------------------------- */
/**
* @task internal
*/
public static function envConfigExists($key) {
return array_key_exists($key, self::$sourceStack->getKeys(array($key)));
}
/**
* @task internal
*/
public static function getAllConfigKeys() {
return self::$sourceStack->getAllKeys();
}
public static function getConfigSourceStack() {
return self::$sourceStack;
}
/**
* @task internal
*/
public static function overrideTestEnvConfig($stack_key, $key, $value) {
$tmp = array();
// If we don't have the right key, we'll throw when popping the last
// source off the stack.
do {
$source = self::$sourceStack->popSource();
array_unshift($tmp, $source);
if (spl_object_hash($source) == $stack_key) {
$source->setKeys(array($key => $value));
break;
}
} while (true);
foreach ($tmp as $source) {
self::$sourceStack->pushSource($source);
}
self::dropConfigCache();
}
private static function dropConfigCache() {
self::$cache = array();
}
}
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