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<?php
namespace Aws\Signature;
use Aws\Credentials\CredentialsInterface;
use Psr\Http\Message\RequestInterface;
/**
* Amazon S3 signature version 4 support.
*/
class S3SignatureV4 extends SignatureV4
{
/**
* S3-specific signing logic
*
* {@inheritdoc}
*/
public function signRequest(
RequestInterface $request,
CredentialsInterface $credentials,
$signingService = null
) {
// Always add a x-amz-content-sha-256 for data integrity
if (!$request->hasHeader('x-amz-content-sha256')) {
$request = $request->withHeader(
'x-amz-content-sha256',
$this->getPayload($request)
);
}
if (strpos($request->getUri()->getHost(), "s3-object-lambda")) {
return parent::signRequest($request, $credentials, "s3-object-lambda");
}
return parent::signRequest($request, $credentials);
}
/**
* Always add a x-amz-content-sha-256 for data integrity.
*
* {@inheritdoc}
*/
public function presign(
RequestInterface $request,
CredentialsInterface $credentials,
$expires,
array $options = []
) {
if (!$request->hasHeader('x-amz-content-sha256')) {
$request = $request->withHeader(
'X-Amz-Content-Sha256',
$this->getPresignedPayload($request)
);
}
return parent::presign($request, $credentials, $expires, $options);
}
/**
* Override used to allow pre-signed URLs to be created for an
* in-determinate request payload.
*/
protected function getPresignedPayload(RequestInterface $request)
{
return SignatureV4::UNSIGNED_PAYLOAD;
}
/**
* Amazon S3 does not double-encode the path component in the canonical request
*/
protected function createCanonicalizedPath($path)
{
// Only remove one slash in case of keys that have a preceding slash
if (substr($path, 0, 1) === '/') {
$path = substr($path, 1);
}
return '/' . $path;
}
}