public HttpWebRequest GetRequest(RequestParameters requestParameters)
{
OAuthHeaderBuilder oAuthHeaderBuilder = new OAuthHeaderBuilder(AuthenticationContext);
OAuthSignatureBuilder signatureBuilder = new OAuthSignatureBuilder(AuthenticationContext);
string oauthSignature = signatureBuilder.CreateSignature(requestParameters);
requestParameters.Headers.AddOAuthSignature(oauthSignature);
var authHeader = oAuthHeaderBuilder.BuildAuthHeader(requestParameters);
ServicePointManager.Expect100Continue = false;
var queryUrl = requestParameters.GetRequestUrl();
var request = (HttpWebRequest)WebRequest.Create(queryUrl);
request.Headers.Add("Authorization", authHeader);
request.Method = requestParameters.HttpMethod;
request.ContentType = "application/x-www-form-urlencoded";
string postBody = requestParameters.GetPostBody();
if (!string.IsNullOrWhiteSpace(postBody))
{
using (Stream stream = request.GetRequestStream())
{
byte[] content = Encoding.ASCII.GetBytes(postBody);
stream.Write(content, 0, content.Length);
}
}
return request;
}
public string CreateSignature(RequestParameters parameters)
{
// 3.) Creating the signature base string
string signatureBaseString = GetSignatureBaseString(parameters);
// 4.) Getting a signing key
string signingKey = GetSigningKey();
// 5.) Calculating the signature
var result = CalculateSignature(signingKey, signatureBaseString);
return result;
}
public string GetSignatureBaseString(RequestParameters parameters)
{
const string separator = "&";
var result = new StringBuilder();
// 1.) Convert the HTTP Method to uppercase and set the output string equal to this value.
result.Append(parameters.HttpMethod.ToUpperInvariant());
// 2.) Append the ‘&’ character to the output string.
result.Append(separator);
// 3.) Percent encode the URL and append it to the output string.
result.Append(Uri.EscapeDataString(parameters.BaseUrl));
// 4.) Append the ‘&’ character to the output string.
result.Append(separator);
// 5.) Percent encode the parameter string and append it to the output string.
var baseString = GetParameterString(parameters.GetParameters(), separator);
result.Append(Uri.EscapeDataString(baseString));
return result.ToString();
}
private static HttpWebRequest GetWebRequest(
IAuthenticationContext authenticationContext, RequestParameters requestParameters)
{
var requestBuilder = new RequestBuilder(authenticationContext);
return requestBuilder.GetRequest(requestParameters);
}
public RequestContextFixture()
{
AuthenticationContext = new TestAuthenticationContext();
RequestParameters = new TestRequestParameters(AuthenticationContext);
}
public string BuildAuthHeader(RequestParameters requestParameters)
{
return $"OAuth {GetParameterString(requestParameters.Headers.Values, ", ")}";
}
