<?php
namespace Aws;
use Aws\Api\Validator;
use Aws\Api\ApiProvider;
use Aws\Api\Service;
use Aws\Credentials\Credentials;
use Aws\Credentials\CredentialsInterface;
use Aws\Signature\SignatureProvider;
use Aws\Endpoint\EndpointProvider;
use Aws\Credentials\CredentialProvider;
use GuzzleHttp\Promise;
use InvalidArgumentException as IAE;
use Psr\Http\Message\RequestInterface;
/**
* @internal Resolves a hash of client arguments to construct a client.
*/
class ClientResolver
{
/** @var array */
private $argDefinitions;
/** @var array Map of types to a corresponding function */
private static $typeMap = [
'resource' => 'is_resource',
'callable' => 'is_callable',
'int' => 'is_int',
'bool' => 'is_bool',
'string' => 'is_string',
'object' => 'is_object',
'array' => 'is_array',
];
private static $defaultArgs = [
'service' => [
'type' => 'value',
'valid' => ['string'],
'doc' => 'Name of the service to utilize. This value will be supplied by default when using one of the SDK clients (e.g., Aws\\S3\\S3Client).',
'required' => true,
'internal' => true
],
'exception_class' => [
'type' => 'value',
'valid' => ['string'],
'doc' => 'Exception class to create when an error occurs.',
'default' => 'Aws\Exception\AwsException',
'internal' => true
],
'scheme' => [
'type' => 'value',
'valid' => ['string'],
'default' => 'https',
'doc' => 'URI scheme to use when connecting connect. The SDK will utilize "https" endpoints (i.e., utilize SSL/TLS connections) by default. You can attempt to connect to a service over an unencrypted "http" endpoint by setting ``scheme`` to "http".',
],
'endpoint' => [
'type' => 'value',
'valid' => ['string'],
'doc' => 'The full URI of the webservice. This is only required when connecting to a custom endpoint (e.g., a local version of S3).',
'fn' => [__CLASS__, '_apply_endpoint'],
],
'region' => [
'type' => 'value',
'valid' => ['string'],
'required' => [__CLASS__, '_missing_region'],
'doc' => 'Region to connect to. See http://docs.aws.amazon.com/general/latest/gr/rande.html for a list of available regions.',
],
'version' => [
'type' => 'value',
'valid' => ['string'],
'required' => [__CLASS__, '_missing_version'],
'doc' => 'The version of the webservice to utilize (e.g., 2006-03-01).',
],
'signature_provider' => [
'type' => 'value',
'valid' => ['callable'],
'doc' => 'A callable that accepts a signature version name (e.g., "v4"), a service name, and region, and returns a SignatureInterface object or null. This provider is used to create signers utilized by the client. See Aws\\Signature\\SignatureProvider for a list of built-in providers',
'default' => [__CLASS__, '_default_signature_provider'],
],
'endpoint_provider' => [
'type' => 'value',
'valid' => ['callable'],
'fn' => [__CLASS__, '_apply_endpoint_provider'],
'doc' => 'An optional PHP callable that accepts a hash of options including a "service" and "region" key and returns NULL or a hash of endpoint data, of which the "endpoint" key is required. See Aws\\Endpoint\\EndpointProvider for a list of built-in providers.',
'default' => [__CLASS__, '_default_endpoint_provider'],
],
'api_provider' => [
'type' => 'value',
'valid' => ['callable'],
'doc' => 'An optional PHP callable that accepts a type, service, and version argument, and returns an array of corresponding configuration data. The type value can be one of api, waiter, or paginator.',
'fn' => [__CLASS__, '_apply_api_provider'],
'default' => [ApiProvider::class, 'defaultProvider'],
],
'signature_version' => [
'type' => 'config',
'valid' => ['string'],
'doc' => 'A string representing a custom signature version to use with a service (e.g., v4). Note that per/operation signature version MAY override this requested signature version.',
'default' => [__CLASS__, '_default_signature_version'],
],
'profile' => [
'type' => 'config',
'valid' => ['string'],
'doc' => 'Allows you to specify which profile to use when credentials are created from the AWS credentials file in your HOME directory. This setting overrides the AWS_PROFILE environment variable. Note: Specifying "profile" will cause the "credentials" key to be ignored.',
'fn' => [__CLASS__, '_apply_profile'],
],
'credentials' => [
'type' => 'value',
'valid' => [CredentialsInterface::class, CacheInterface::class, 'array', 'bool', 'callable'],
'doc' => 'Specifies the credentials used to sign requests. Provide an Aws\Credentials\CredentialsInterface object, an associative array of "key", "secret", and an optional "token" key, `false` to use null credentials, or a callable credentials provider used to create credentials or return null. See Aws\\Credentials\\CredentialProvider for a list of built-in credentials providers. If no credentials are provided, the SDK will attempt to load them from the environment.',
'fn' => [__CLASS__, '_apply_credentials'],
'default' => [CredentialProvider::class, 'defaultProvider'],
],
'retries' => [
'type' => 'value',
'valid' => ['int'],
'doc' => 'Configures the maximum number of allowed retries for a client (pass 0 to disable retries). ',
'fn' => [__CLASS__, '_apply_retries'],
'default' => 3,
],
'validate' => [
'type' => 'value',
'valid' => ['bool', 'array'],
'default' => true,
'doc' => 'Set to false to disable client-side parameter validation. Set to true to utilize default validation constraints. Set to an associative array of validation options to enable specific validation constraints.',
'fn' => [__CLASS__, '_apply_validate'],
],
'debug' => [
'type' => 'value',
'valid' => ['bool', 'array'],
'doc' => 'Set to true to display debug information when sending requests. Alternatively, you can provide an associative array with the following keys: logfn: (callable) Function that is invoked with log messages; stream_size: (int) When the size of a stream is greater than this number, the stream data will not be logged (set to "0" to not log any stream data); scrub_auth: (bool) Set to false to disable the scrubbing of auth data from the logged messages; http: (bool) Set to false to disable the "debug" feature of lower level HTTP adapters (e.g., verbose curl output).',
'fn' => [__CLASS__, '_apply_debug'],
],
'http' => [
'type' => 'value',
'valid' => ['array'],
'default' => [],
'doc' => 'Set to an array of SDK request options to apply to each request (e.g., proxy, verify, etc.).',
],
'http_handler' => [
'type' => 'value',
'valid' => ['callable'],
'doc' => 'An HTTP handler is a function that accepts a PSR-7 request object and returns a promise that is fulfilled with a PSR-7 response object or rejected with an array of exception data. NOTE: This option supersedes any provided "handler" option.',
'fn' => [__CLASS__, '_apply_http_handler']
],
'handler' => [
'type' => 'value',
'valid' => ['callable'],
'doc' => 'A handler that accepts a command object, request object and returns a promise that is fulfilled with an Aws\ResultInterface object or rejected with an Aws\Exception\AwsException. A handler does not accept a next handler as it is terminal and expected to fulfill a command. If no handler is provided, a default Guzzle handler will be utilized.',
'fn' => [__CLASS__, '_apply_handler'],
'default' => [__CLASS__, '_default_handler']
],
'ua_append' => [
'type' => 'value',
'valid' => ['string', 'array'],
'doc' => 'Provide a string or array of strings to send in the User-Agent header.',
'fn' => [__CLASS__, '_apply_user_agent'],
'default' => [],
],
];
/**
* Gets an array of default client arguments, each argument containing a
* hash of the following:
*
* - type: (string, required) option type described as follows:
* - value: The default option type.
* - config: The provided value is made available in the client's
* getConfig() method.
* - valid: (array, required) Valid PHP types or class names. Note: null
* is not an allowed type.
* - required: (bool, callable) Whether or not the argument is required.
* Provide a function that accepts an array of arguments and returns a
* string to provide a custom error message.
* - default: (mixed) The default value of the argument if not provided. If
* a function is provided, then it will be invoked to provide a default
* value. The function is provided the array of options and is expected
* to return the default value of the option.
* - doc: (string) The argument documentation string.
* - fn: (callable) Function used to apply the argument. The function
* accepts the provided value, array of arguments by reference, and an
* event emitter.
*
* Note: Order is honored and important when applying arguments.
*
* @return array
*/
public static function getDefaultArguments()
{
return self::$defaultArgs;
}
/**
* @param array $argDefinitions Client arguments.
*/
public function __construct(array $argDefinitions)
{
$this->argDefinitions = $argDefinitions;
}
/**
* Resolves client configuration options and attached event listeners.
*
* @param array $args Provided constructor arguments.
* @param HandlerList $list Handler list to augment.
*
* @return array Returns the array of provided options.
* @throws \InvalidArgumentException
* @see Aws\AwsClient::__construct for a list of available options.
*/
public function resolve(array $args, HandlerList $list)
{
$args['config'] = [];
foreach ($this->argDefinitions as $key => $a) {
// Add defaults, validate required values, and skip if not set.
if (!isset($args[$key])) {
if (isset($a['default'])) {
// Merge defaults in when not present.
$args[$key] = is_callable($a['default'])
? $a['default']($args)
: $a['default'];
} elseif (empty($a['required'])) {
continue;
} else {
$this->throwRequired($args);
}
}
// Validate the types against the provided value.
foreach ($a['valid'] as $check) {
if (isset(self::$typeMap[$check])) {
$fn = self::$typeMap[$check];
if ($fn($args[$key])) {
goto is_valid;
}
} elseif ($args[$key] instanceof $check) {
goto is_valid;
}
}
$this->invalidType($key, $args[$key]);
// Apply the value
is_valid:
if (isset($a['fn'])) {
$a['fn']($args[$key], $args, $list);
}
if ($a['type'] === 'config') {
$args['config'][$key] = $args[$key];
}
}
return $args;
}
/**
* Creates a verbose error message for an invalid argument.
*
* @param string $name Name of the argument that is missing.
* @param array $args Provided arguments
* @param bool $useRequired Set to true to show the required fn text if
* available instead of the documentation.
* @return string
*/
private function getArgMessage($name, $args = [], $useRequired = false)
{
$arg = $this->argDefinitions[$name];
$msg = '';
$modifiers = [];
if (isset($arg['valid'])) {
$modifiers[] = implode('|', $arg['valid']);
}
if (isset($arg['choice'])) {
$modifiers[] = 'One of ' . implode(', ', $arg['choice']);
}
if ($modifiers) {
$msg .= '(' . implode('; ', $modifiers) . ')';
}
$msg = wordwrap("{$name}: {$msg}", 75, "\n ");
if ($useRequired && is_callable($arg['required'])) {
$msg .= "\n\n ";
$msg .= str_replace("\n", "\n ", call_user_func($arg['required'], $args));
} elseif (isset($arg['doc'])) {
$msg .= wordwrap("\n\n {$arg['doc']}", 75, "\n ");
}
return $msg;
}
/**
* Throw when an invalid type is encountered.
*
* @param string $name Name of the value being validated.
* @param mixed $provided The provided value.
* @throws \InvalidArgumentException
*/
private function invalidType($name, $provided)
{
$expected = implode('|', $this->argDefinitions[$name]['valid']);
$msg = "Invalid configuration value "
. "provided for \"{$name}\". Expected {$expected}, but got "
. describe_type($provided) . "\n\n"
. $this->getArgMessage($name);
throw new IAE($msg);
}
/**
* Throws an exception for missing required arguments.
*
* @param array $args Passed in arguments.
* @throws \InvalidArgumentException
*/
private function throwRequired(array $args)
{
$missing = [];
foreach ($this->argDefinitions as $k => $a) {
if (empty($a['required'])
|| isset($a['default'])
|| array_key_exists($k, $args)
) {
continue;
}
$missing[] = $this->getArgMessage($k, $args, true);
}
$msg = "Missing required client configuration options: \n\n";
$msg .= implode("\n\n", $missing);
throw new IAE($msg);
}
public static function _apply_retries($value, array &$args, HandlerList $list)
{
if ($value) {
$decider = RetryMiddleware::createDefaultDecider($value);
$list->appendSign(Middleware::retry($decider), 'retry');
}
}
public static function _apply_credentials($value, array &$args)
{
if (is_callable($value)) {
return;
} elseif ($value instanceof CredentialsInterface) {
$args['credentials'] = CredentialProvider::fromCredentials($value);
} elseif (is_array($value)
&& isset($value['key'])
&& isset($value['secret'])
) {
$args['credentials'] = CredentialProvider::fromCredentials(
new Credentials(
$value['key'],
$value['secret'],
isset($value['token']) ? $value['token'] : null,
isset($value['expires']) ? $value['expires'] : null
)
);
} elseif ($value === false) {
$args['credentials'] = CredentialProvider::fromCredentials(
new Credentials('', '')
);
$args['config']['signature_version'] = 'anonymous';
} elseif ($value instanceof CacheInterface) {
$args['credentials'] = CredentialProvider::defaultProvider($args);
} else {
throw new IAE('Credentials must be an instance of '
. 'Aws\Credentials\CredentialsInterface, an associative '
. 'array that contains "key", "secret", and an optional "token" '
. 'key-value pairs, a credentials provider function, or false.');
}
}
public static function _apply_api_provider(callable $value, array &$args, HandlerList $list)
{
$api = new Service(
ApiProvider::resolve(
$value,
'api',
$args['service'],
$args['version']
),
$value
);
$args['api'] = $api;
$args['serializer'] = Service::createSerializer($api, $args['endpoint']);
$args['parser'] = Service::createParser($api);
$args['error_parser'] = Service::createErrorParser($api->getProtocol());
$list->prependBuild(Middleware::requestBuilder($args['serializer']), 'builder');
}
public static function _apply_endpoint_provider(callable $value, array &$args)
{
if (!isset($args['endpoint'])) {
// Invoke the endpoint provider and throw if it does not resolve.
$result = EndpointProvider::resolve($value, [
'service' => $args['service'],
'region' => $args['region'],
'scheme' => $args['scheme']
]);
$args['endpoint'] = $result['endpoint'];
if (isset($result['signatureVersion'])) {
$args['config']['signature_version'] = $result['signatureVersion'];
}
}
}
public static function _apply_debug($value, array &$args, HandlerList $list)
{
if ($value !== false) {
$list->interpose(new TraceMiddleware($value === true ? [] : $value));
}
}
public static function _apply_profile($_, array &$args)
{
$args['credentials'] = CredentialProvider::ini($args['profile']);
}
public static function _apply_validate($value, array &$args, HandlerList $list)
{
if ($value === false) {
return;
}
$validator = $value === true
? new Validator()
: new Validator($value);
$list->appendValidate(
Middleware::validation($args['api'], $validator),
'validation'
);
}
public static function _apply_handler($value, array &$args, HandlerList $list)
{
$list->setHandler($value);
}
public static function _default_handler(array &$args)
{
return new WrappedHttpHandler(
default_http_handler(),
$args['parser'],
$args['error_parser'],
$args['exception_class']
);
}
public static function _apply_http_handler($value, array &$args, HandlerList $list)
{
$args['handler'] = new WrappedHttpHandler(
$value,
$args['parser'],
$args['error_parser'],
$args['exception_class']
);
}
public static function _apply_user_agent($value, array &$args, HandlerList $list)
{
if (!is_array($value)) {
$value = [$value];
}
$value = array_map('strval', $value);
array_unshift($value, 'aws-sdk-php/' . Sdk::VERSION);
$args['ua_append'] = $value;
$list->appendBuild(static function (callable $handler) use ($value) {
return function (
CommandInterface $command,
RequestInterface $request
) use ($handler, $value) {
return $handler($command, $request->withHeader(
'User-Agent',
implode(' ', array_merge(
$value,
$request->getHeader('User-Agent')
))
));
};
});
}
public static function _apply_endpoint($value, array &$args, HandlerList $list)
{
$parts = parse_url($value);
if (empty($parts['scheme']) || empty($parts['host'])) {
throw new IAE(
'Endpoints must be full URIs and include a scheme and host'
);
}
$args['endpoint'] = $value;
}
public static function _default_endpoint_provider()
{
return EndpointProvider::defaultProvider();
}
public static function _default_signature_provider()
{
return SignatureProvider::defaultProvider();
}
public static function _default_signature_version(array &$args)
{
return isset($args['config']['signature_version'])
? $args['config']['signature_version']
: $args['api']->getSignatureVersion();
}
public static function _missing_version(array $args)
{
$service = isset($args['service']) ? $args['service'] : '';
$versions = ApiProvider::defaultProvider()->getVersions($service);
$versions = implode("\n", array_map(function ($v) {
return "* \"$v\"";
}, $versions)) ?: '* (none found)';
return <<<EOT
A "version" configuration value is required. Specifying a version constraint
ensures that your code will not be affected by a breaking change made to the
service. For example, when using Amazon S3, you can lock your API version to
"2006-03-01".
Your build of the SDK has the following version(s) of "{$service}": {$versions}
You may provide "latest" to the "version" configuration value to utilize the
most recent available API version that your client's API provider can find.
Note: Using 'latest' in a production application is not recommended.
A list of available API versions can be found on each client's API documentation
page: http://docs.aws.amazon.com/aws-sdk-php/v3/api/index.html. If you are
unable to load a specific API version, then you may need to update your copy of
the SDK.
EOT;
}
public static function _missing_region(array $args)
{
$service = isset($args['service']) ? $args['service'] : '';
return <<<EOT
A "region" configuration value is required for the "{$service}" service
(e.g., "us-west-2"). A list of available public regions and endpoints can be
found at http://docs.aws.amazon.com/general/latest/gr/rande.html.
EOT;
}
}
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