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1 efrain 1 
<?php
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namespace Aws\CognitoIdentity;
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use Aws\Credentials\Credentials;
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use GuzzleHttp\Promise;
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class CognitoIdentityProvider
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{
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    /** @var CognitoIdentityClient */
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    private $client;
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    /** @var string */
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    private $identityPoolId;
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    /** @var string|null */
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    private $accountId;
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    /** @var array */
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    private $logins;
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    public function __construct(
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        $poolId,
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        array $clientOptions,
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        array $logins = [],
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        $accountId = null
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    ) {
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        $this->identityPoolId = $poolId;
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        $this->logins = $logins;
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        $this->accountId = $accountId;
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        $this->client = new CognitoIdentityClient($clientOptions + [
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            'credentials' => false,
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        ]);
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    }
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    public function __invoke()
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    {
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        return Promise\Coroutine::of(function () {
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            $params = $this->logins ? ['Logins' => $this->logins] : [];
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            $getIdParams = $params + ['IdentityPoolId' => $this->identityPoolId];
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            if ($this->accountId) {
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                $getIdParams['AccountId'] = $this->accountId;
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            }
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            $id = (yield $this->client->getId($getIdParams));
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            $result = (yield $this->client->getCredentialsForIdentity([
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                'IdentityId' => $id['IdentityId'],
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            ] + $params));
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            yield new Credentials(
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                $result['Credentials']['AccessKeyId'],
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                $result['Credentials']['SecretKey'],
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                $result['Credentials']['SessionToken'],
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                (int) $result['Credentials']['Expiration']->format('U')
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            );
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        });
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    }
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    public function updateLogin($key, $value)
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    {
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        $this->logins[$key] = $value;
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        return $this;
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    }
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}