/// <summary>This is the main code to sign a request.</summary>
/// <param name="requestMessage">An HttpRequestMessage to be signed.</param>
public void SignRequest(HttpRequestMessage requestMessage)
{
HttpMethod httpMethod = requestMessage.Method;
HttpRequestHeaders httpHeaders = requestMessage.Headers;
HttpContent body = requestMessage.Content;
string requestMethodKey = httpMethod.Method.ToLowerInvariant();
// Verify if the http request Method is supported.
if (!signingStrategy.RequiredHeaders.TryGetValue(requestMethodKey, out var requiredHeaders))
{
throw new ArgumentException($"Http Request Method not found: {requestMethodKey}");
}
var headersToSign = requiredHeaders.ToList();
// Add any missing required headers.
SigningUtils.AddMissingHeaders(requestMessage, headersToSign);
// Calculate the Signing string.
var signingString = SigningUtils.CalculateStringToSign(requestMessage, headersToSign);
logger.Debug($"signing string is {signingString}");
var bytes = Encoding.UTF8.GetBytes(signingString);
this.signer.BlockUpdate(bytes, 0, bytes.Length);
var signature = Convert.ToBase64String(this.signer.GenerateSignature());
var authorization = SigningUtils.CalculateAuthorization(headersToSign, SIGNATURE_VERSION, this.keyId, SIGNATURE_ALGORITHM, signature);
httpHeaders.Add(Constants.AUTHORIZATION_HEADER, authorization);
}
/// <summary>This is the main code to sign a request.</summary>
/// <param name="requestMessage">An HttpRequestMessage to be signed.</param>
public override void SignRequest(HttpRequestMessage requestMessage)
{
HttpMethod httpMethod = requestMessage.Method;
HttpRequestHeaders httpHeaders = requestMessage.Headers;
HttpContent body = requestMessage.Content;
string requestMethodKey = httpMethod.Method.ToLowerInvariant();
// Verify if the http request Method is supported.
if (!signingStrategy.RequiredHeaders.TryGetValue(requestMethodKey, out var requiredHeaders))
{
throw new ArgumentException($"Http Request Method not found: {requestMethodKey}");
}
var headersToSign = requiredHeaders.ToList();
//Add the Instance OBO User delegation token to request headers if the auth details provider implements IUserDelegationDetailsProvider and
//if a token is available.
var delegationToken = (AuthDetailsProvider as IUserDelegationDetailsProvider)?.GetDelegationToken();
if (delegationToken != null)
{
logger.Debug($"Adding {Constants.OPC_OBO_TOKEN} to request headers");
requestMessage.Headers.TryAddWithoutValidation(Constants.OPC_OBO_TOKEN, delegationToken);
}
// For PUT and POST, if the body is empty we still must explicitly set content-length = 0 and x-content-sha256.
// The caller may already do this, but we shouldn't require it since we can determine it here.
if (body == null && (string.Equals(requestMethodKey, "post") || string.Equals(requestMethodKey, "put")))
{
requestMessage.Content = new StringContent("");
requestMessage.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
requestMessage.Content.Headers.TryAddWithoutValidation(Constants.CONTENT_LENGTH, "0");
requestMessage.Content.Headers.TryAddWithoutValidation(Constants.X_CONTENT_SHA256, Convert.ToBase64String(SHA256.Create().ComputeHash(new byte[0])));
}
// Few requests accept Constants.OPTIONAL_HEADERS_NAMES headers. In such cases, if the request contains any of the optional headers,
// we need to include them in request signature.
if (signingStrategy.OptionalHeaders.TryGetValue(requestMethodKey, out var optionalHeaders))
{
foreach (var optionalHeaderName in optionalHeaders)
{
if (httpHeaders.Contains(optionalHeaderName))
{
headersToSign.Add(optionalHeaderName);
}
}
}
// Add any missing required headers.
SigningUtils.AddMissingHeaders(requestMessage, headersToSign);
// Calculate the Signing string.
var signingString = SigningUtils.CalculateStringToSign(requestMessage, headersToSign);
var bytes = Encoding.UTF8.GetBytes(signingString);
this.signer.BlockUpdate(bytes, 0, bytes.Length);
var signature = Convert.ToBase64String(this.signer.GenerateSignature());
var authorization = SigningUtils.CalculateAuthorization(headersToSign, SIGNATURE_VERSION, this.keyId, SIGNATURE_ALGORITHM, signature);
httpHeaders.Add(Constants.AUTHORIZATION_HEADER, authorization);
}