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<?php namespace Aws; use Aws\EndpointDiscovery\Configuration; use Closure; use Psr\Http\Message\RequestInterface; /** * Builds and injects the user agent header values. * This middleware must be appended into step where all the * metrics to be gathered are already resolved. As of now it should be * after the signing step. */ class UserAgentMiddleware { const AGENT_VERSION = 2.1; static $userAgentFnList = [ 'getSdkVersion', 'getUserAgentVersion', 'getHhvmVersion', 'getOsName', 'getLangVersion', 'getExecEnv', 'getEndpointDiscovery', 'getAppId', 'getMetrics' ]; /** @var callable */ private $nextHandler; /** @var array */ private $args; /** @var MetricsBuilder */ private $metricsBuilder; /** * Returns a middleware wrapper function. * * @param array $args * * @return Closure */ public static function wrap( array $args ) : Closure { return function (callable $handler) use ($args) { return new self($handler, $args); }; } /** * @param callable $nextHandler * @param array $args */ public function __construct(callable $nextHandler, array $args=[]) { $this->nextHandler = $nextHandler; $this->args = $args; } /** * When invoked, its injects the user agent header into the * request headers. * * @param CommandInterface $command * @param RequestInterface $request * * @return mixed */ public function __invoke(CommandInterface $command, RequestInterface $request) { $handler = $this->nextHandler; $this->metricsBuilder = MetricsBuilder::fromCommand($command); $request = $this->requestWithUserAgentHeader($request); return $handler($command, $request); } /** * Builds the user agent header value, and injects it into the request * headers. Then, it returns the mutated request. * * @param RequestInterface $request * * @return RequestInterface */ private function requestWithUserAgentHeader(RequestInterface $request): RequestInterface { $uaAppend = $this->args['ua_append'] ?? []; $userAgentValue = array_merge( $this->buildUserAgentValue(), $uaAppend ); // It includes the user agent values just for the User-Agent header. // The reason is that the SEP does not mention appending the // metrics into the X-Amz-User-Agent header. return $request->withHeader( 'User-Agent', implode(' ', array_merge( $userAgentValue, $request->getHeader('User-Agent') )) ); } /** * Builds the different user agent values. * * @return array */ private function buildUserAgentValue(): array { $userAgentValue = []; foreach (self::$userAgentFnList as $fn) { $val = $this->{$fn}(); if (!empty($val)) { $userAgentValue[] = $val; } } return $userAgentValue; } /** * Returns the user agent value for SDK version. * * @return string */ private function getSdkVersion(): string { return 'aws-sdk-php/' . Sdk::VERSION; } /** * Returns the user agent value for the agent version. * * @return string */ private function getUserAgentVersion(): string { return 'ua/' . self::AGENT_VERSION; } /** * Returns the user agent value for the hhvm version, but just * when it is defined. * * @return string */ private function getHhvmVersion(): string { if (defined('HHVM_VERSION')) { return 'HHVM/' . HHVM_VERSION; } return ""; } /** * Returns the user agent value for the os version. * * @return string */ private function getOsName(): string { $disabledFunctions = explode(',', ini_get('disable_functions')); if (function_exists('php_uname') && !in_array('php_uname', $disabledFunctions, true) ) { $osName = "OS/" . php_uname('s') . '#' . php_uname('r'); if (!empty($osName)) { return $osName; } } return ""; } /** * Returns the user agent value for the php language used. * * @return string */ private function getLangVersion(): string { return 'lang/php#' . phpversion(); } /** * Returns the user agent value for the execution env. * * @return string */ private function getExecEnv(): string { if ($executionEnvironment = getenv('AWS_EXECUTION_ENV')) { return $executionEnvironment; } return ""; } /** * Returns the user agent value for endpoint discovery as cfg. * This feature is deprecated. * * @return string */ private function getEndpointDiscovery(): string { $args = $this->args; if (isset($args['endpoint_discovery'])) { if (($args['endpoint_discovery'] instanceof Configuration && $args['endpoint_discovery']->isEnabled()) ) { return 'cfg/endpoint-discovery'; } elseif (is_array($args['endpoint_discovery']) && isset($args['endpoint_discovery']['enabled']) && $args['endpoint_discovery']['enabled'] ) { return 'cfg/endpoint-discovery'; } } return ""; } /** * Returns the user agent value for app id, but just when an * app id was provided as a client argument. * * @return string */ private function getAppId(): string { if (empty($this->args['app_id'])) { return ""; } return 'app/' . $this->args['app_id']; } /** * Returns the user agent value for metrics. * * @return string */ private function getMetrics(): string { // Resolve first metrics related to client arguments. $this->metricsBuilder->resolveAndAppendFromArgs($this->args); // Build the metrics. $metricsEncoded = $this->metricsBuilder->build(); if (empty($metricsEncoded)) { return ""; } return "m/" . $metricsEncoded; } }
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