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namespace Aws\Signature;
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namespace Aws\Signature;
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use Aws\Credentials\CredentialsInterface;
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use Aws\Credentials\CredentialsInterface;
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use AWS\CRT\Auth\Signable;
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use AWS\CRT\Auth\Signable;
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use AWS\CRT\Auth\SignatureType;
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use AWS\CRT\Auth\SignatureType;
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use AWS\CRT\Auth\SignedBodyHeaderType;
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use AWS\CRT\Auth\Signing;
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use AWS\CRT\Auth\Signing;
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use AWS\CRT\Auth\SigningAlgorithm;
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use AWS\CRT\Auth\SigningAlgorithm;
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use AWS\CRT\Auth\SigningConfigAWS;
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use AWS\CRT\Auth\SigningConfigAWS;
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use AWS\CRT\Auth\StaticCredentialsProvider;
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use AWS\CRT\Auth\StaticCredentialsProvider;
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            $req['body'],
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            $req['body'],
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            $req['version']
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            $req['version']
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        );
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        );
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    }
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    }
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    private function verifyCRTLoaded()
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    protected function verifyCRTLoaded()
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    {
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    {
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        if (!extension_loaded('awscrt')) {
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        if (!extension_loaded('awscrt')) {
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            throw new CommonRuntimeException(
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            throw new CommonRuntimeException(
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                "AWS Common Runtime for PHP is required to use Signature V4A"
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                "AWS Common Runtime for PHP is required to use Signature V4A"
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                . ".  Please install it using the instructions found at"
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                . ".  Please install it using the instructions found at"
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                . " https://github.com/aws/aws-sdk-php/blob/master/CRT_INSTRUCTIONS.md"
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                . " https://github.com/aws/aws-sdk-php/blob/master/CRT_INSTRUCTIONS.md"
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            );
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            );
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        }
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        }
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    }
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    }
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    private function createCRTStaticCredentialsProvider($credentials)
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    protected function createCRTStaticCredentialsProvider($credentials)
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    {
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    {
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        return new StaticCredentialsProvider([
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        return new StaticCredentialsProvider([
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            'access_key_id' => $credentials->getAccessKeyId(),
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            'access_key_id' => $credentials->getAccessKeyId(),
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            'secret_access_key' => $credentials->getSecretKey(),
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            'secret_access_key' => $credentials->getSecretKey(),
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            'session_token' => $credentials->getSecurityToken(),
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            'session_token' => $credentials->getSecurityToken(),
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        ]);
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        ]);
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    }
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    }
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    private function removeIllegalV4aHeaders(&$request)
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    private function removeIllegalV4aHeaders(&$request)
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    {
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    {
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        $illegalV4aHeaders = [
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        static $illegalV4aHeaders = [
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            self::AMZ_CONTENT_SHA256_HEADER,
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            self::AMZ_CONTENT_SHA256_HEADER,
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            'aws-sdk-invocation-id',
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            "aws-sdk-invocation-id",
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            'aws-sdk-retry',
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            "aws-sdk-retry",
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            'x-amz-region-set',
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            'x-amz-region-set'
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            'transfer-encoding'
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        ];
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        ];
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        $storedHeaders = [];
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        $storedHeaders = [];
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        foreach ($illegalV4aHeaders as $header) {
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        foreach ($illegalV4aHeaders as $header) {
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            if ($request->hasHeader($header)){
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            if ($request->hasHeader($header)) {
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    /**
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    /**
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     * @param CredentialsInterface $credentials
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     * @param CredentialsInterface $credentials
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     * @param RequestInterface $request
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     * @param RequestInterface $request
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     * @param $signingService
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     * @param $signingService
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     * @param SigningConfigAWS|null $signingConfig
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     * @return RequestInterface
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     * @return RequestInterface
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     */
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     */
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    protected function signWithV4a(
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        CredentialsInterface $credentials,
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        RequestInterface $request,
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        $signingService,
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    protected function signWithV4a(CredentialsInterface $credentials, RequestInterface $request, $signingService)
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        ?SigningConfigAWS $signingConfig = null
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    {
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    ){
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        $this->verifyCRTLoaded();
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        $credentials_provider = $this->createCRTStaticCredentialsProvider($credentials);
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        $this->verifyCRTLoaded();
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        $signingConfig = new SigningConfigAWS([
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        $signingConfig = $signingConfig ?? new SigningConfigAWS([
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            'algorithm' => SigningAlgorithm::SIGv4_ASYMMETRIC,
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            'algorithm' => SigningAlgorithm::SIGv4_ASYMMETRIC,
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            'signature_type' => SignatureType::HTTP_REQUEST_HEADERS,
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            'signature_type' => SignatureType::HTTP_REQUEST_HEADERS,
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            'credentials_provider' => $credentials_provider,
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            'credentials_provider' => $this->createCRTStaticCredentialsProvider($credentials),
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            'signed_body_value' => $this->getPayload($request),
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            'should_normalize_uri_path' => true,
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            'signed_body_value' => $this->getPayload($request),
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            'use_double_uri_encode' => true,
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            'region' => "*",
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            'region' => $this->region,
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            'service' => $signingService,
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            'service' => $signingService,
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            'date' => time(),
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            'date' => time(),
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        ]);
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        ]);