Method getAuthorizationHeader

plugins/origin_server_auth/aws_auth_v4.cc:724–759

* @brief Get the value of the Authorization header (AWS authorization) v4 * @return the Authorization header value */

 * @return the Authorization header value
 */
String
AwsAuthV4::getAuthorizationHeader()
{
  String signedHeaders;
  String canonicalReq = getCanonicalRequestSha256Hash(_api, _signPayload, _includedHeaders, _excludedHeaders, signedHeaders);

  int         hostLen = 0;
  const char *host    = _api.getHost(&hostLen);

  String awsRegion = getRegion(_regionMap, host, hostLen);

  String stringToSign = getStringToSign(_dateTime, sizeof(_dateTime) - 1, awsRegion.c_str(), awsRegion.length(), _awsService,
                                        _awsServiceLen, canonicalReq.c_str(), canonicalReq.length());
#ifdef AWS_AUTH_V4_DETAILED_DEBUG_OUTPUT
  std::cout << "<StringToSign>" << stringToSign << "</StringToSign>" << std::endl;
#endif

  char   signature[EVP_MAX_MD_SIZE] = "";
  size_t signatureLen =
    getSignature(_awsSecretAccessKey, _awsSecretAccessKeyLen, awsRegion.c_str(), awsRegion.length(), _awsService, _awsServiceLen,
                 _dateTime, 8, stringToSign.c_str(), stringToSign.length(), signature, EVP_MAX_MD_SIZE);

  String base16Signature = base16Encode(signature, signatureLen);
#ifdef AWS_AUTH_V4_DETAILED_DEBUG_OUTPUT
  std::cout << "<SignatureProvided>" << base16Signature << "</SignatureProvided>" << std::endl;
#endif

  std::stringstream authorizationHeader;
  authorizationHeader << "AWS4-HMAC-SHA256 ";
  authorizationHeader << "Credential=" << String(_awsAccessKeyId, _awsAccessKeyIdLen) << "/" << String(_dateTime, 8) << "/"
                      << awsRegion << "/" << String(_awsService, _awsServiceLen) << "/" << "aws4_request" << ",";
  authorizationHeader << "SignedHeaders=" << signedHeaders << ",";
  authorizationHeader << "Signature=" << base16Signature;

  return authorizationHeader.str();
}

/**
 * @brief Authorization v4 constructor