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<?php namespace Aws\EndpointDiscovery; use Aws\CacheInterface; use Aws\EndpointDiscovery\Exception\ConfigurationException; use GuzzleHttp\Promise; use GuzzleHttp\Promise\PromiseInterface; /** * A configuration provider is a function that returns a promise that is * fulfilled with a {@see \Aws\EndpointDiscovery\ConfigurationInterface} * or rejected with an {@see \Aws\EndpointDiscovery\Exception\ConfigurationException}. * * <code> * use Aws\EndpointDiscovery\ConfigurationProvider; * $provider = ConfigurationProvider::defaultProvider(); * // Returns a ConfigurationInterface or throws. * $config = $provider()->wait(); * </code> * * Configuration providers can be composed to create configuration using * conditional logic that can create different configurations in different * environments. You can compose multiple providers into a single provider using * {@see Aws\EndpointDiscovery\ConfigurationProvider::chain}. This function * accepts providers as variadic arguments and returns a new function that will * invoke each provider until a successful configuration is returned. * * <code> * // First try an INI file at this location. * $a = ConfigurationProvider::ini(null, '/path/to/file.ini'); * // Then try an INI file at this location. * $b = ConfigurationProvider::ini(null, '/path/to/other-file.ini'); * // Then try loading from environment variables. * $c = ConfigurationProvider::env(); * // Combine the three providers together. * $composed = ConfigurationProvider::chain($a, $b, $c); * // Returns a promise that is fulfilled with a configuration or throws. * $promise = $composed(); * // Wait on the configuration to resolve. * $config = $promise->wait(); * </code> */ class ConfigurationProvider { const CACHE_KEY = 'aws_cached_endpoint_discovery_config'; const DEFAULT_ENABLED = false; const DEFAULT_CACHE_LIMIT = 1000; const ENV_ENABLED = 'AWS_ENDPOINT_DISCOVERY_ENABLED'; const ENV_ENABLED_ALT = 'AWS_ENABLE_ENDPOINT_DISCOVERY'; const ENV_PROFILE = 'AWS_PROFILE'; /** * Wraps a config provider and saves provided configuration in an * instance of Aws\CacheInterface. Forwards calls when no config found * in cache and updates cache with the results. * * @param callable $provider Configuration provider function to wrap * @param CacheInterface $cache Cache to store credentials * @param string|null $cacheKey (optional) Cache key to use * * @return callable */ public static function cache( callable $provider, CacheInterface $cache, $cacheKey = null ) { $cacheKey = $cacheKey ?: self::CACHE_KEY; return function () use ($provider, $cache, $cacheKey) { $found = $cache->get($cacheKey); if ($found instanceof ConfigurationInterface) { return Promise\promise_for($found); } return $provider() ->then(function (ConfigurationInterface $config) use ( $cache, $cacheKey ) { $cache->set($cacheKey, $config); return $config; }); }; } /** * Creates an aggregate credentials provider that invokes the provided * variadic providers one after the other until a provider returns * credentials. * * @return callable */ public static function chain() { $links = func_get_args(); if (empty($links)) { throw new \InvalidArgumentException('No providers in chain'); } return function () use ($links) { /** @var callable $parent */ $parent = array_shift($links); $promise = $parent(); while ($next = array_shift($links)) { $promise = $promise->otherwise($next); } return $promise; }; } /** * Create a default config provider that first checks for environment * variables, then checks for a specified profile in ~/.aws/config, then * checks for the "default" profile in ~/.aws/config, and failing those uses * a default fallback set of configuration options. * * This provider is automatically wrapped in a memoize function that caches * previously provided config options. * * @param array $config Optional array of ecs/instance profile credentials * provider options. * * @return callable */ public static function defaultProvider(array $config = []) { $configProviders = [ self::env(), self::ini(), self::fallback() ]; $memo = self::memoize( call_user_func_array('self::chain', $configProviders) ); if (isset($config['endpoint_discovery']) && $config['endpoint_discovery'] instanceof CacheInterface ) { return self::cache($memo, $config['endpoint_discovery'], self::CACHE_KEY); } return $memo; } /** * Provider that creates config from environment variables. * * @param $cacheLimit * @return callable */ public static function env($cacheLimit = self::DEFAULT_CACHE_LIMIT) { return function () use ($cacheLimit) { // Use config from environment variables, if available $enabled = getenv(self::ENV_ENABLED); if ($enabled === false || $enabled === '') { $enabled = getenv(self::ENV_ENABLED_ALT); } if ($enabled !== false && $enabled !== '') { return Promise\promise_for( new Configuration($enabled, $cacheLimit) ); } return self::reject('Could not find environment variable config' . ' in ' . self::ENV_ENABLED); }; } /** * Fallback config options when other sources are not set. * * @return callable */ public static function fallback() { return function () { return Promise\promise_for( new Configuration( self::DEFAULT_ENABLED, self::DEFAULT_CACHE_LIMIT ) ); }; } /** * Gets the environment's HOME directory if available. * * @return null|string */ private static function getHomeDir() { // On Linux/Unix-like systems, use the HOME environment variable if ($homeDir = getenv('HOME')) { return $homeDir; } // Get the HOMEDRIVE and HOMEPATH values for Windows hosts $homeDrive = getenv('HOMEDRIVE'); $homePath = getenv('HOMEPATH'); return ($homeDrive && $homePath) ? $homeDrive . $homePath : null; } /** * Config provider that creates config using an ini file stored * in the current user's home directory. * * @param string|null $profile Profile to use. If not specified will use * the "default" profile in "~/.aws/config". * @param string|null $filename If provided, uses a custom filename rather * than looking in the home directory. * @param int $cacheLimit * * @return callable */ public static function ini( $profile = null, $filename = null, $cacheLimit = self::DEFAULT_CACHE_LIMIT ) { $filename = $filename ?: (self::getHomeDir() . '/.aws/config'); $profile = $profile ?: (getenv(self::ENV_PROFILE) ?: 'default'); return function () use ($profile, $filename, $cacheLimit) { if (!is_readable($filename)) { return self::reject("Cannot read configuration from $filename"); } $data = \Aws\parse_ini_file($filename, true); if ($data === false) { return self::reject("Invalid config file: $filename"); } if (!isset($data[$profile])) { return self::reject("'$profile' not found in config file"); } if (!isset($data[$profile]['endpoint_discovery_enabled'])) { return self::reject("Required endpoint discovery config values not present in INI profile '{$profile}' ({$filename})"); } return Promise\promise_for( new Configuration( $data[$profile]['endpoint_discovery_enabled'], $cacheLimit ) ); }; } /** * Wraps a config provider and caches previously provided configuration. * * Ensures that cached configuration is refreshed when it expires. * * @param callable $provider Config provider function to wrap. * * @return callable */ public static function memoize(callable $provider) { return function () use ($provider) { static $result; static $isConstant; // Constant config will be returned constantly. if ($isConstant) { return $result; } // Create the initial promise that will be used as the cached value // until it expires. if (null === $result) { $result = $provider(); } // Return config and set flag that provider is already set return $result ->then(function (ConfigurationInterface $config) use (&$isConstant) { $isConstant = true; return $config; }); }; } /** * Reject promise with standardized exception. * * @param $msg * @return Promise\RejectedPromise */ private static function reject($msg) { return new Promise\RejectedPromise(new ConfigurationException($msg)); } /** * Unwraps a configuration object in whatever valid form it is in, * always returning a ConfigurationInterface object. * * @param mixed $config * @return ConfigurationInterface * @throws \InvalidArgumentException */ public static function unwrap($config) { if (is_callable($config)) { $config = $config(); } if ($config instanceof PromiseInterface) { $config = $config->wait(); } if ($config instanceof ConfigurationInterface) { return $config; } elseif (is_array($config) && isset($config['enabled'])) { if (isset($config['cache_limit'])) { return new Configuration( $config['enabled'], $config['cache_limit'] ); } return new Configuration( $config['enabled'], self::DEFAULT_CACHE_LIMIT ); } throw new \InvalidArgumentException('Not a valid endpoint_discovery ' . 'configuration argument.'); } }
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