<?php

namespace VendorDuplicator\Aws\Credentials;

use VendorDuplicator\Aws;
use VendorDuplicator\Aws\Api\DateTimeResult;
use VendorDuplicator\Aws\CacheInterface;
use VendorDuplicator\Aws\Exception\CredentialsException;
use VendorDuplicator\Aws\Sts\StsClient;
use VendorDuplicator\GuzzleHttp\Promise;
/**
 * Credential providers are functions that accept no arguments and return a
 * promise that is fulfilled with an {@see \Aws\Credentials\CredentialsInterface}
 * or rejected with an {@see \Aws\Exception\CredentialsException}.
 *
 * <code>
 * use Aws\Credentials\CredentialProvider;
 * $provider = CredentialProvider::defaultProvider();
 * // Returns a CredentialsInterface or throws.
 * $creds = $provider()->wait();
 * </code>
 *
 * Credential providers can be composed to create credentials using conditional
 * logic that can create different credentials in different environments. You
 * can compose multiple providers into a single provider using
 * {@see Aws\Credentials\CredentialProvider::chain}. This function accepts
 * providers as variadic arguments and returns a new function that will invoke
 * each provider until a successful set of credentials is returned.
 *
 * <code>
 * // First try an INI file at this location.
 * $a = CredentialProvider::ini(null, '/path/to/file.ini');
 * // Then try an INI file at this location.
 * $b = CredentialProvider::ini(null, '/path/to/other-file.ini');
 * // Then try loading from environment variables.
 * $c = CredentialProvider::env();
 * // Combine the three providers together.
 * $composed = CredentialProvider::chain($a, $b, $c);
 * // Returns a promise that is fulfilled with credentials or throws.
 * $promise = $composed();
 * // Wait on the credentials to resolve.
 * $creds = $promise->wait();
 * </code>
 */
class CredentialProvider
{
    const ENV_ARN = 'AWS_ROLE_ARN';
    const ENV_KEY = 'AWS_ACCESS_KEY_ID';
    const ENV_PROFILE = 'AWS_PROFILE';
    const ENV_ROLE_SESSION_NAME = 'AWS_ROLE_SESSION_NAME';
    const ENV_SECRET = 'AWS_SECRET_ACCESS_KEY';
    const ENV_SESSION = 'AWS_SESSION_TOKEN';
    const ENV_TOKEN_FILE = 'AWS_WEB_IDENTITY_TOKEN_FILE';
    const ENV_SHARED_CREDENTIALS_FILE = 'AWS_SHARED_CREDENTIALS_FILE';
    /**
     * Create a default credential provider that
     * first checks for environment variables,
     * then checks for assumed role via web identity,
     * then checks for cached SSO credentials from the CLI,
     * then check for credential_process in the "default" profile in ~/.aws/credentials,
     * then checks for the "default" profile in ~/.aws/credentials,
     * then for credential_process in the "default profile" profile in ~/.aws/config,
     * then checks for "profile default" profile in ~/.aws/config (which is
     * the default profile of AWS CLI),
     * then tries to make a GET Request to fetch credentials if ECS environment variable is presented,
     * finally checks for EC2 instance profile credentials.
     *
     * This provider is automatically wrapped in a memoize function that caches
     * previously provided credentials.
     *
     * @param array $config Optional array of ecs/instance profile credentials
     *                      provider options.
     *
     * @return callable
     */
    public static function defaultProvider(array $config = [])
    {
        $cacheable = ['web_identity', 'sso', 'process_credentials', 'process_config', 'ecs', 'instance'];
        $profileName = \getenv(self::ENV_PROFILE) ?: 'default';
        $defaultChain = ['env' => self::env(), 'web_identity' => self::assumeRoleWithWebIdentityCredentialProvider($config)];
        if (!isset($config['use_aws_shared_config_files']) || $config['use_aws_shared_config_files'] !== \false) {
            $defaultChain['sso'] = self::sso($profileName, self::getHomeDir() . '/.aws/config', $config);
            $defaultChain['process_credentials'] = self::process();
            $defaultChain['ini'] = self::ini();
            $defaultChain['process_config'] = self::process('profile ' . $profileName, self::getHomeDir() . '/.aws/config');
            $defaultChain['ini_config'] = self::ini('profile ' . $profileName, self::getHomeDir() . '/.aws/config');
        }
        if (self::shouldUseEcs()) {
            $defaultChain['ecs'] = self::ecsCredentials($config);
        } else {
            $defaultChain['instance'] = self::instanceProfile($config);
        }
        if (isset($config['credentials']) && $config['credentials'] instanceof CacheInterface) {
            foreach ($cacheable as $provider) {
                if (isset($defaultChain[$provider])) {
                    $defaultChain[$provider] = self::cache($defaultChain[$provider], $config['credentials'], 'aws_cached_' . $provider . '_credentials');
                }
            }
        }
        return self::memoize(\call_user_func_array([CredentialProvider::class, 'chain'], \array_values($defaultChain)));
    }
    /**
     * Create a credential provider function from a set of static credentials.
     *
     * @param CredentialsInterface $creds
     *
     * @return callable
     */
    public static function fromCredentials(CredentialsInterface $creds)
    {
        $promise = Promise\Create::promiseFor($creds);
        return function () use($promise) {
            return $promise;
        };
    }
    /**
     * 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 ($previousCreds = null) use($links) {
            /** @var callable $parent */
            $parent = \array_shift($links);
            $promise = $parent();
            while ($next = \array_shift($links)) {
                if ($next instanceof InstanceProfileProvider && $previousCreds instanceof Credentials) {
                    $promise = $promise->otherwise(function () use($next, $previousCreds) {
                        return $next($previousCreds);
                    });
                } else {
                    $promise = $promise->otherwise($next);
                }
            }
            return $promise;
        };
    }
    /**
     * Wraps a credential provider and caches previously provided credentials.
     *
     * Ensures that cached credentials are refreshed when they expire.
     *
     * @param callable $provider Credentials provider function to wrap.
     *
     * @return callable
     */
    public static function memoize(callable $provider)
    {
        return function () use($provider) {
            static $result;
            static $isConstant;
            // Constant credentials will be returned constantly.
            if ($isConstant) {
                return $result;
            }
            // Create the initial promise that will be used as the cached value
            // until it expires.
            if (null === $result) {
                $result = $provider();
            }
            // Return credentials that could expire and refresh when needed.
            return $result->then(function (CredentialsInterface $creds) use($provider, &$isConstant, &$result) {
                // Determine if these are constant credentials.
                if (!$creds->getExpiration()) {
                    $isConstant = \true;
                    return $creds;
                }
                // Refresh expired credentials.
                if (!$creds->isExpired()) {
                    return $creds;
                }
                // Refresh the result and forward the promise.
                return $result = $provider($creds);
            })->otherwise(function ($reason) use(&$result) {
                // Cleanup rejected promise.
                $result = null;
                return new Promise\RejectedPromise($reason);
            });
        };
    }
    /**
     * Wraps a credential provider and saves provided credentials in an
     * instance of Aws\CacheInterface. Forwards calls when no credentials found
     * in cache and updates cache with the results.
     *
     * @param callable $provider Credentials 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 = $cacheKey ?: 'aws_cached_credentials';
        return function () use($provider, $cache, $cacheKey) {
            $found = $cache->get($cacheKey);
            if ($found instanceof CredentialsInterface && !$found->isExpired()) {
                return Promise\Create::promiseFor($found);
            }
            return $provider()->then(function (CredentialsInterface $creds) use($cache, $cacheKey) {
                $cache->set($cacheKey, $creds, null === $creds->getExpiration() ? 0 : $creds->getExpiration() - \time());
                return $creds;
            });
        };
    }
    /**
     * Provider that creates credentials from environment variables
     * AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, and AWS_SESSION_TOKEN.
     *
     * @return callable
     */
    public static function env()
    {
        return function () {
            // Use credentials from environment variables, if available
            $key = \getenv(self::ENV_KEY);
            $secret = \getenv(self::ENV_SECRET);
            if ($key && $secret) {
                return Promise\Create::promiseFor(new Credentials($key, $secret, \getenv(self::ENV_SESSION) ?: NULL));
            }
            return self::reject('Could not find environment variable ' . 'credentials in ' . self::ENV_KEY . '/' . self::ENV_SECRET);
        };
    }
    /**
     * Credential provider that creates credentials using instance profile
     * credentials.
     *
     * @param array $config Array of configuration data.
     *
     * @return InstanceProfileProvider
     * @see Aws\Credentials\InstanceProfileProvider for $config details.
     */
    public static function instanceProfile(array $config = [])
    {
        return new InstanceProfileProvider($config);
    }
    /**
     * Credential provider that retrieves cached SSO credentials from the CLI
     *
     * @return callable
     */
    public static function sso($ssoProfileName = 'default', $filename = null, $config = [])
    {
        $filename = $filename ?: self::getHomeDir() . '/.aws/config';
        return function () use($ssoProfileName, $filename, $config) {
            if (!@\is_readable($filename)) {
                return self::reject("Cannot read credentials from {$filename}");
            }
            $profiles = self::loadProfiles($filename);
            if (isset($profiles[$ssoProfileName])) {
                $ssoProfile = $profiles[$ssoProfileName];
            } elseif (isset($profiles['profile ' . $ssoProfileName])) {
                $ssoProfileName = 'profile ' . $ssoProfileName;
                $ssoProfile = $profiles[$ssoProfileName];
            } else {
                return self::reject("Profile {$ssoProfileName} does not exist in {$filename}.");
            }
            if (!empty($ssoProfile['sso_session'])) {
                return CredentialProvider::getSsoCredentials($profiles, $ssoProfileName, $filename, $config);
            } else {
                return CredentialProvider::getSsoCredentialsLegacy($profiles, $ssoProfileName, $filename, $config);
            }
        };
    }
    /**
     * Credential provider that creates credentials using
     * ecs credentials by a GET request, whose uri is specified
     * by environment variable
     *
     * @param array $config Array of configuration data.
     *
     * @return EcsCredentialProvider
     * @see Aws\Credentials\EcsCredentialProvider for $config details.
     */
    public static function ecsCredentials(array $config = [])
    {
        return new EcsCredentialProvider($config);
    }
    /**
     * Credential provider that creates credentials using assume role
     *
     * @param array $config Array of configuration data
     * @return callable
     * @see Aws\Credentials\AssumeRoleCredentialProvider for $config details.
     */
    public static function assumeRole(array $config = [])
    {
        return new AssumeRoleCredentialProvider($config);
    }
    /**
     * Credential provider that creates credentials by assuming role from a
     * Web Identity Token
     *
     * @param array $config Array of configuration data
     * @return callable
     * @see Aws\Credentials\AssumeRoleWithWebIdentityCredentialProvider for
     * $config details.
     */
    public static function assumeRoleWithWebIdentityCredentialProvider(array $config = [])
    {
        return function () use($config) {
            $arnFromEnv = \getenv(self::ENV_ARN);
            $tokenFromEnv = \getenv(self::ENV_TOKEN_FILE);
            $stsClient = isset($config['stsClient']) ? $config['stsClient'] : null;
            $region = isset($config['region']) ? $config['region'] : null;
            if ($tokenFromEnv && $arnFromEnv) {
                $sessionName = \getenv(self::ENV_ROLE_SESSION_NAME) ? \getenv(self::ENV_ROLE_SESSION_NAME) : null;
                $provider = new AssumeRoleWithWebIdentityCredentialProvider(['RoleArn' => $arnFromEnv, 'WebIdentityTokenFile' => $tokenFromEnv, 'SessionName' => $sessionName, 'client' => $stsClient, 'region' => $region]);
                return $provider();
            }
            $profileName = \getenv(self::ENV_PROFILE) ?: 'default';
            if (isset($config['filename'])) {
                $profiles = self::loadProfiles($config['filename']);
            } else {
                $profiles = self::loadDefaultProfiles();
            }
            if (isset($profiles[$profileName])) {
                $profile = $profiles[$profileName];
                if (isset($profile['region'])) {
                    $region = $profile['region'];
                }
                if (isset($profile['web_identity_token_file']) && isset($profile['role_arn'])) {
                    $sessionName = isset($profile['role_session_name']) ? $profile['role_session_name'] : null;
                    $provider = new AssumeRoleWithWebIdentityCredentialProvider(['RoleArn' => $profile['role_arn'], 'WebIdentityTokenFile' => $profile['web_identity_token_file'], 'SessionName' => $sessionName, 'client' => $stsClient, 'region' => $region]);
                    return $provider();
                }
            } else {
                return self::reject("Unknown profile: {$profileName}");
            }
            return self::reject("No RoleArn or WebIdentityTokenFile specified");
        };
    }
    /**
     * Credentials provider that creates credentials using an ini file stored
     * in the current user's home directory.  A source can be provided
     * in this file for assuming a role using the credential_source config option.
     *
     * @param string|null $profile  Profile to use. If not specified will use
     *                              the "default" profile in "~/.aws/credentials".
     * @param string|null $filename If provided, uses a custom filename rather
     *                              than looking in the home directory.
     * @param array|null $config If provided, may contain the following:
     *                           preferStaticCredentials: If true, prefer static
     *                           credentials to role_arn if both are present
     *                           disableAssumeRole: If true, disable support for
     *                           roles that assume an IAM role. If true and role profile
     *                           is selected, an error is raised.
     *                           stsClient: StsClient used to assume role specified in profile
     *
     * @return callable
     */
    public static function ini($profile = null, $filename = null, array $config = [])
    {
        $filename = self::getFileName($filename);
        $profile = $profile ?: (\getenv(self::ENV_PROFILE) ?: 'default');
        return function () use($profile, $filename, $config) {
            $preferStaticCredentials = isset($config['preferStaticCredentials']) ? $config['preferStaticCredentials'] : \false;
            $disableAssumeRole = isset($config['disableAssumeRole']) ? $config['disableAssumeRole'] : \false;
            $stsClient = isset($config['stsClient']) ? $config['stsClient'] : null;
            if (!@\is_readable($filename)) {
                return self::reject("Cannot read credentials from {$filename}");
            }
            $data = self::loadProfiles($filename);
            if ($data === \false) {
                return self::reject("Invalid credentials file: {$filename}");
            }
            if (!isset($data[$profile])) {
                return self::reject("'{$profile}' not found in credentials file");
            }
            /*
            In the CLI, the presence of both a role_arn and static credentials have
            different meanings depending on how many profiles have been visited. For
            the first profile processed, role_arn takes precedence over any static
            credentials, but for all subsequent profiles, static credentials are
            used if present, and only in their absence will the profile's
            source_profile and role_arn keys be used to load another set of
            credentials. This bool is intended to yield compatible behaviour in this
            sdk.
            */
            $preferStaticCredentialsToRoleArn = $preferStaticCredentials && isset($data[$profile]['aws_access_key_id']) && isset($data[$profile]['aws_secret_access_key']);
            if (isset($data[$profile]['role_arn']) && !$preferStaticCredentialsToRoleArn) {
                if ($disableAssumeRole) {
                    return self::reject("Role assumption profiles are disabled. " . "Failed to load profile " . $profile);
                }
                return self::loadRoleProfile($data, $profile, $filename, $stsClient, $config);
            }
            if (!isset($data[$profile]['aws_access_key_id']) || !isset($data[$profile]['aws_secret_access_key'])) {
                return self::reject("No credentials present in INI profile " . "'{$profile}' ({$filename})");
            }
            if (empty($data[$profile]['aws_session_token'])) {
                $data[$profile]['aws_session_token'] = isset($data[$profile]['aws_security_token']) ? $data[$profile]['aws_security_token'] : null;
            }
            return Promise\Create::promiseFor(new Credentials($data[$profile]['aws_access_key_id'], $data[$profile]['aws_secret_access_key'], $data[$profile]['aws_session_token']));
        };
    }
    /**
     * Credentials provider that creates credentials using a process configured in
     * 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/credentials".
     * @param string|null $filename If provided, uses a custom filename rather
     *                              than looking in the home directory.
     *
     * @return callable
     */
    public static function process($profile = null, $filename = null)
    {
        $filename = self::getFileName($filename);
        $profile = $profile ?: (\getenv(self::ENV_PROFILE) ?: 'default');
        return function () use($profile, $filename) {
            if (!@\is_readable($filename)) {
                return self::reject("Cannot read process credentials from {$filename}");
            }
            $data = \VendorDuplicator\Aws\parse_ini_file($filename, \true, \INI_SCANNER_RAW);
            if ($data === \false) {
                return self::reject("Invalid credentials file: {$filename}");
            }
            if (!isset($data[$profile])) {
                return self::reject("'{$profile}' not found in credentials file");
            }
            if (!isset($data[$profile]['credential_process'])) {
                return self::reject("No credential_process present in INI profile " . "'{$profile}' ({$filename})");
            }
            $credentialProcess = $data[$profile]['credential_process'];
            $json = \shell_exec($credentialProcess);
            $processData = \json_decode($json, \true);
            // Only support version 1
            if (isset($processData['Version'])) {
                if ($processData['Version'] !== 1) {
                    return self::reject("credential_process does not return Version == 1");
                }
            }
            if (!isset($processData['AccessKeyId']) || !isset($processData['SecretAccessKey'])) {
                return self::reject("credential_process does not return valid credentials");
            }
            if (isset($processData['Expiration'])) {
                try {
                    $expiration = new DateTimeResult($processData['Expiration']);
                } catch (\Exception $e) {
                    return self::reject("credential_process returned invalid expiration");
                }
                $now = new DateTimeResult();
                if ($expiration < $now) {
                    return self::reject("credential_process returned expired credentials");
                }
                $expires = $expiration->getTimestamp();
            } else {
                $expires = null;
            }
            if (empty($processData['SessionToken'])) {
                $processData['SessionToken'] = null;
            }
            return Promise\Create::promiseFor(new Credentials($processData['AccessKeyId'], $processData['SecretAccessKey'], $processData['SessionToken'], $expires));
        };
    }
    /**
     * Assumes role for profile that includes role_arn
     *
     * @return callable
     */
    private static function loadRoleProfile($profiles, $profileName, $filename, $stsClient, $config = [])
    {
        $roleProfile = $profiles[$profileName];
        $roleArn = isset($roleProfile['role_arn']) ? $roleProfile['role_arn'] : '';
        $roleSessionName = isset($roleProfile['role_session_name']) ? $roleProfile['role_session_name'] : 'aws-sdk-php-' . \round(\microtime(\true) * 1000);
        if (empty($roleProfile['source_profile']) == empty($roleProfile['credential_source'])) {
            return self::reject("Either source_profile or credential_source must be set " . "using profile " . $profileName . ", but not both.");
        }
        $sourceProfileName = "";
        if (!empty($roleProfile['source_profile'])) {
            $sourceProfileName = $roleProfile['source_profile'];
            if (!isset($profiles[$sourceProfileName])) {
                return self::reject("source_profile " . $sourceProfileName . " using profile " . $profileName . " does not exist");
            }
            if (isset($config['visited_profiles']) && \in_array($roleProfile['source_profile'], $config['visited_profiles'])) {
                return self::reject("Circular source_profile reference found.");
            }
            $config['visited_profiles'][] = $roleProfile['source_profile'];
        } else {
            if (empty($roleArn)) {
                return self::reject("A role_arn must be provided with credential_source in " . "file {$filename} under profile {$profileName} ");
            }
        }
        if (empty($stsClient)) {
            $sourceRegion = isset($profiles[$sourceProfileName]['region']) ? $profiles[$sourceProfileName]['region'] : 'us-east-1';
            $config['preferStaticCredentials'] = \true;
            $sourceCredentials = null;
            if (!empty($roleProfile['source_profile'])) {
                $sourceCredentials = \call_user_func(CredentialProvider::ini($sourceProfileName, $filename, $config))->wait();
            } else {
                $sourceCredentials = self::getCredentialsFromSource($profileName, $filename);
            }
            $stsClient = new StsClient(['credentials' => $sourceCredentials, 'region' => $sourceRegion, 'version' => '2011-06-15']);
        }
        $result = $stsClient->assumeRole(['RoleArn' => $roleArn, 'RoleSessionName' => $roleSessionName]);
        $credentials = $stsClient->createCredentials($result);
        return Promise\Create::promiseFor($credentials);
    }
    /**
     * Gets the environment's HOME directory if available.
     *
     * @return null|string
     */
    private static function getHomeDir()
    {
        // On Linux/Unix-like systems, use the HOME environment variable
        if ($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;
    }
    /**
     * Gets profiles from specified $filename, or default ini files.
     */
    private static function loadProfiles($filename)
    {
        $profileData = \VendorDuplicator\Aws\parse_ini_file($filename, \true, \INI_SCANNER_RAW);
        // If loading .aws/credentials, also load .aws/config when AWS_SDK_LOAD_NONDEFAULT_CONFIG is set
        if ($filename === self::getHomeDir() . '/.aws/credentials' && \getenv('AWS_SDK_LOAD_NONDEFAULT_CONFIG')) {
            $configFilename = self::getHomeDir() . '/.aws/config';
            $configProfileData = \VendorDuplicator\Aws\parse_ini_file($configFilename, \true, \INI_SCANNER_RAW);
            foreach ($configProfileData as $name => $profile) {
                // standardize config profile names
                $name = \str_replace('profile ', '', $name);
                if (!isset($profileData[$name])) {
                    $profileData[$name] = $profile;
                }
            }
        }
        return $profileData;
    }
    /**
     * Gets profiles from ~/.aws/credentials and ~/.aws/config ini files
     */
    private static function loadDefaultProfiles()
    {
        $profiles = [];
        $credFile = self::getHomeDir() . '/.aws/credentials';
        $configFile = self::getHomeDir() . '/.aws/config';
        if (\file_exists($credFile)) {
            $profiles = \VendorDuplicator\Aws\parse_ini_file($credFile, \true, \INI_SCANNER_RAW);
        }
        if (\file_exists($configFile)) {
            $configProfileData = \VendorDuplicator\Aws\parse_ini_file($configFile, \true, \INI_SCANNER_RAW);
            foreach ($configProfileData as $name => $profile) {
                // standardize config profile names
                $name = \str_replace('profile ', '', $name);
                if (!isset($profiles[$name])) {
                    $profiles[$name] = $profile;
                }
            }
        }
        return $profiles;
    }
    public static function getCredentialsFromSource($profileName = '', $filename = '', $config = [])
    {
        $data = self::loadProfiles($filename);
        $credentialSource = !empty($data[$profileName]['credential_source']) ? $data[$profileName]['credential_source'] : null;
        $credentialsPromise = null;
        switch ($credentialSource) {
            case 'Environment':
                $credentialsPromise = self::env();
                break;
            case 'Ec2InstanceMetadata':
                $credentialsPromise = self::instanceProfile($config);
                break;
            case 'EcsContainer':
                $credentialsPromise = self::ecsCredentials($config);
                break;
            default:
                throw new CredentialsException("Invalid credential_source found in config file: {$credentialSource}. Valid inputs " . "include Environment, Ec2InstanceMetadata, and EcsContainer.");
        }
        $credentialsResult = null;
        try {
            $credentialsResult = $credentialsPromise()->wait();
        } catch (\Exception $reason) {
            return self::reject("Unable to successfully retrieve credentials from the source specified in the" . " credentials file: {$credentialSource}; failure message was: " . $reason->getMessage());
        }
        return function () use($credentialsResult) {
            return Promise\Create::promiseFor($credentialsResult);
        };
    }
    private static function reject($msg)
    {
        return new Promise\RejectedPromise(new CredentialsException($msg));
    }
    /**
     * @param $filename
     * @return string
     */
    private static function getFileName($filename)
    {
        if (!isset($filename)) {
            $filename = \getenv(self::ENV_SHARED_CREDENTIALS_FILE) ?: self::getHomeDir() . '/.aws/credentials';
        }
        return $filename;
    }
    /**
     * @return boolean
     */
    public static function shouldUseEcs()
    {
        //Check for relative uri. if not, then full uri.
        //fall back to server for each as getenv is not thread-safe.
        return !empty(\getenv(EcsCredentialProvider::ENV_URI)) || !empty($_SERVER[EcsCredentialProvider::ENV_URI]) || !empty(\getenv(EcsCredentialProvider::ENV_FULL_URI)) || !empty($_SERVER[EcsCredentialProvider::ENV_FULL_URI]);
    }
    /**
     * @param $profiles
     * @param $ssoProfileName
     * @param $filename
     * @param $config
     * @return Promise\PromiseInterface
     */
    private static function getSsoCredentials($profiles, $ssoProfileName, $filename, $config)
    {
        if (empty($config['ssoOidcClient'])) {
            $ssoProfile = $profiles[$ssoProfileName];
            $sessionName = $ssoProfile['sso_session'];
            if (empty($profiles['sso-session ' . $sessionName])) {
                return self::reject("Could not find sso-session {$sessionName} in {$filename}");
            }
            $ssoSession = $profiles['sso-session ' . $ssoProfile['sso_session']];
            $ssoOidcClient = new Aws\SSOOIDC\SSOOIDCClient(['region' => $ssoSession['sso_region'], 'version' => '2019-06-10', 'credentials' => \false]);
        } else {
            $ssoOidcClient = $config['ssoClient'];
        }
        $tokenPromise = new Aws\Token\SsoTokenProvider($ssoProfileName, $filename, $ssoOidcClient);
        $token = $tokenPromise()->wait();
        $ssoCredentials = CredentialProvider::getCredentialsFromSsoService($ssoProfile, $ssoSession['sso_region'], $token->getToken(), $config);
        $expiration = $ssoCredentials['expiration'];
        return Promise\Create::promiseFor(new Credentials($ssoCredentials['accessKeyId'], $ssoCredentials['secretAccessKey'], $ssoCredentials['sessionToken'], $expiration));
    }
    /**
     * @param $profiles
     * @param $ssoProfileName
     * @param $filename
     * @param $config
     * @return Promise\PromiseInterface
     */
    private static function getSsoCredentialsLegacy($profiles, $ssoProfileName, $filename, $config)
    {
        $ssoProfile = $profiles[$ssoProfileName];
        if (empty($ssoProfile['sso_start_url']) || empty($ssoProfile['sso_region']) || empty($ssoProfile['sso_account_id']) || empty($ssoProfile['sso_role_name'])) {
            return self::reject("Profile {$ssoProfileName} in {$filename} must contain the following keys: " . "sso_start_url, sso_region, sso_account_id, and sso_role_name.");
        }
        $tokenLocation = self::getHomeDir() . '/.aws/sso/cache/' . \sha1($ssoProfile['sso_start_url']) . ".json";
        if (!@\is_readable($tokenLocation)) {
            return self::reject("Unable to read token file at {$tokenLocation}");
        }
        $tokenData = \json_decode(\file_get_contents($tokenLocation), \true);
        if (empty($tokenData['accessToken']) || empty($tokenData['expiresAt'])) {
            return self::reject("Token file at {$tokenLocation} must contain an access token and an expiration");
        }
        try {
            $expiration = (new DateTimeResult($tokenData['expiresAt']))->getTimestamp();
        } catch (\Exception $e) {
            return self::reject("Cached SSO credentials returned an invalid expiration");
        }
        $now = \time();
        if ($expiration < $now) {
            return self::reject("Cached SSO credentials returned expired credentials");
        }
        $ssoCredentials = CredentialProvider::getCredentialsFromSsoService($ssoProfile, $ssoProfile['sso_region'], $tokenData['accessToken'], $config);
        return Promise\Create::promiseFor(new Credentials($ssoCredentials['accessKeyId'], $ssoCredentials['secretAccessKey'], $ssoCredentials['sessionToken'], $expiration));
    }
    /**
     * @param array $ssoProfile
     * @param string $clientRegion
     * @param string $accessToken
     * @param array $config
     * @return array|null
     */
    private static function getCredentialsFromSsoService($ssoProfile, $clientRegion, $accessToken, $config)
    {
        if (empty($config['ssoClient'])) {
            $ssoClient = new Aws\SSO\SSOClient(['region' => $clientRegion, 'version' => '2019-06-10', 'credentials' => \false]);
        } else {
            $ssoClient = $config['ssoClient'];
        }
        $ssoResponse = $ssoClient->getRoleCredentials(['accessToken' => $accessToken, 'accountId' => $ssoProfile['sso_account_id'], 'roleName' => $ssoProfile['sso_role_name']]);
        $ssoCredentials = $ssoResponse['roleCredentials'];
        return $ssoCredentials;
    }
}
