protected function S3fsCorsPostObjectV4::getPolicyAndSignature in S3 File System CORS Upload 7

1 call to S3fsCorsPostObjectV4::getPolicyAndSignature()

S3fsCorsPostObjectV4::__construct in ./s3fs_cors.post_object_v4.class.inc

Constructs the PostObject.

File

./s3fs_cors.post_object_v4.class.inc, line 161

The code of classes was taken from the AWS SDK v3.180.3 and a bit modified. Next classes are used here:

Class

S3fsCorsPostObjectV4

Encapsulates the logic for getting the data for an S3 object POST upload form

Code

protected function getPolicyAndSignature(CredentialsInterface $credentials, array $policy) {
  $ldt = gmdate('Ymd\\THis\\Z');

  // SignatureV4::ISO8601_BASIC
  $sdt = substr($ldt, 0, 8);
  $policy['conditions'][] = [
    'X-Amz-Date' => $ldt,
  ];
  $region = $this->client
    ->getRegion();
  $scope = $this
    ->createScope($sdt, $region, 's3');
  $creds = "{$credentials->getAccessKeyId()}/{$scope}";
  $policy['conditions'][] = [
    'X-Amz-Credential' => $creds,
  ];
  $policy['conditions'][] = [
    'X-Amz-Algorithm' => "AWS4-HMAC-SHA256",
  ];
  $jsonPolicy64 = base64_encode(json_encode($policy));
  $key = $this
    ->getSigningKey($sdt, $region, 's3', $credentials
    ->getSecretKey());
  return [
    'X-Amz-Credential' => $creds,
    'X-Amz-Algorithm' => "AWS4-HMAC-SHA256",
    'X-Amz-Date' => $ldt,
    'Policy' => $jsonPolicy64,
    'X-Amz-Signature' => bin2hex(hash_hmac('sha256', $jsonPolicy64, $key, true)),
  ];
}