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<?php
namespace Aws\Endpoint\UseDualstackEndpoint;
use Aws\AbstractConfigurationProvider;
use Aws\CacheInterface;
use Aws\ConfigurationProviderInterface;
use Aws\Endpoint\UseDualstackEndpoint\Exception\ConfigurationException;
use GuzzleHttp\Promise;
/**
* A configuration provider is a function that returns a promise that is
* fulfilled with a {@see \Aws\Endpoint\UseDualstackEndpoint\onfigurationInterface}
* or rejected with an {@see \Aws\Endpoint\UseDualstackEndpoint\ConfigurationException}.
*
* <code>
* use Aws\Endpoint\UseDualstackEndpoint\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\Endpoint\UseDualstackEndpoint\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 extends AbstractConfigurationProvider
implements ConfigurationProviderInterface
{
const ENV_USE_DUAL_STACK_ENDPOINT = 'AWS_USE_DUALSTACK_ENDPOINT';
const INI_USE_DUAL_STACK_ENDPOINT = 'use_dualstack_endpoint';
public static $cacheKey = 'aws_cached_use_dualstack_endpoint_config';
protected static $interfaceClass = ConfigurationInterface::class;
protected static $exceptionClass = ConfigurationException::class;
/**
* Create a default config provider that first checks for environment
* variables, then checks for a specified profile in the environment-defined
* config file location (env variable is 'AWS_CONFIG_FILE', file location
* defaults to ~/.aws/config), then checks for the "default" profile in the
* environment-defined config file location, 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
*
* @return callable
*/
public static function defaultProvider(array $config = [])
{
$region = $config['region'];
$configProviders = [self::env($region)];
if (
!isset($config['use_aws_shared_config_files'])
|| $config['use_aws_shared_config_files'] != false
) {
$configProviders[] = self::ini($region);
}
$configProviders[] = self::fallback($region);
$memo = self::memoize(
call_user_func_array([ConfigurationProvider::class, 'chain'], $configProviders)
);
if (isset($config['use_dual_stack_endpoint'])
&& $config['use_dual_stack_endpoint'] instanceof CacheInterface
) {
return self::cache($memo, $config['use_dual_stack_endpoint'], self::$cacheKey);
}
return $memo;
}
/**
* Provider that creates config from environment variables.
*
* @return callable
*/
public static function env($region)
{
return function () use ($region) {
// Use config from environment variables, if available
$useDualstackEndpoint = getenv(self::ENV_USE_DUAL_STACK_ENDPOINT);
if (!empty($useDualstackEndpoint)) {
return Promise\Create::promiseFor(
new Configuration($useDualstackEndpoint, $region)
);
}
return self::reject('Could not find environment variable config'
. ' in ' . self::ENV_USE_DUAL_STACK_ENDPOINT);
};
}
/**
* Config provider that creates config using a config file whose location
* is specified by an environment variable 'AWS_CONFIG_FILE', defaulting to
* ~/.aws/config if not specified
*
* @param string|null $profile Profile to use. If not specified will use
* the "default" profile.
* @param string|null $filename If provided, uses a custom filename rather
* than looking in the default directory.
*
* @return callable
*/
public static function ini($region, $profile = null, $filename = null)
{
$filename = $filename ?: (self::getDefaultConfigFilename());
$profile = $profile ?: (getenv(self::ENV_PROFILE) ?: 'default');
return function () use ($region, $profile, $filename) {
if (!@is_readable($filename)) {
return self::reject("Cannot read configuration from $filename");
}
// Use INI_SCANNER_NORMAL instead of INI_SCANNER_TYPED for PHP 5.5 compatibility
$data = \Aws\parse_ini_file($filename, true, INI_SCANNER_NORMAL);
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][self::INI_USE_DUAL_STACK_ENDPOINT])) {
return self::reject("Required use dualstack endpoint config values
not present in INI profile '{$profile}' ({$filename})");
}
// INI_SCANNER_NORMAL parses false-y values as an empty string
if ($data[$profile][self::INI_USE_DUAL_STACK_ENDPOINT] === "") {
$data[$profile][self::INI_USE_DUAL_STACK_ENDPOINT] = false;
}
return Promise\Create::promiseFor(
new Configuration($data[$profile][self::INI_USE_DUAL_STACK_ENDPOINT], $region)
);
};
}
/**
* Fallback config options when other sources are not set.
*
* @return callable
*/
public static function fallback($region)
{
return function () use ($region) {
return Promise\Create::promiseFor(new Configuration(false, $region));
};
}
}

vendor/aws/aws-sdk-php/src/Endpoint/UseDualstackEndpoint/ConfigurationProvider.php line 134