private string GenerateOAuthSignature(string url, string method, ArrayList allParameters, string tokenSecret)
{
// The parameters must be sorted by key name before generating the signature hash
//allParameters = (ArrayList)allParameters.OrderBy(s => s);
//allParameters.OrderBy(s=>s).
object[] sortedParameters = (object[])allParameters.OrderBy(s => s, (a, b) => ((IComparable)a).CompareTo(b));
// Get the parameters in the form of a query string
string normalizedParameters = HTTPUtility.ParameterListToQueryString(sortedParameters);
// Concatenate the HTTP method, URL, and parameter string
string signatureBase = method + '&' + HTTPUtility.UrlEncode(url) + '&' + HTTPUtility.UrlEncode(normalizedParameters);
// Get a byte array of the signatureBase
byte[] data = Encoding.UTF8.GetBytes(signatureBase);
// Get the key
string key = consumerSecret + '&' + tokenSecret;
byte[] keyBytes = Encoding.UTF8.GetBytes(key);
// Compute the HMAC-SHA1 hash
byte[] hashBytes = SHA.computeHMAC_SHA1(keyBytes, data);
// The signature is a Base64 encoded version of the hash
return(HTTPUtility.ConvertToBase64String(hashBytes));
}
/// <summary>
/// Creates an OAuth HTTP request.
/// </summary>
/// <param name="url">The request URL (without query string parameters)</param>
/// <param name="method">Must be equal to "GET" or "POST"</param>
/// <param name="consumerKey">The OAuth Consumer Key</param>
/// <param name="consumerSecret">The OAuth Consumer Secret</param>
/// <param name="parameters">A NearlyGenericArrayList of QueryParameter objects, or null if no parameters are needed</param>
/// <param name="token">The OAuth access token</param>
/// <param name="tokenSecret">The OAuth token secret</param>
/// <returns>An HttpWebResponse object</returns>
public HttpRequest GetOAuthRequest(string url, string method, ArrayList parameters = null, string token = null, string tokenSecret = null)
{
SendDebugMessage("Creating OAuth HTTP Request for: " + url);
ArrayList oauthParams = GenerateOAuthParameters(token);
// Get a list of all parameters for the OAuth signature
ArrayList allParams = new ArrayList();
foreach (var item in oauthParams)
{
allParams.Add(item);
}
if (parameters != null)
{
foreach (var item in parameters)
{
allParams.Add(item);
}
}
// Get the signature
SendDebugMessage("Signing request...");
string oauthSignature = GenerateOAuthSignature(url, method, allParams, tokenSecret);
SendDebugMessage("Done.");
// Add the signature to the OAuth parameters
oauthParams.Add(new QueryParameter("oauth_signature", oauthSignature));
// Generate the OAuth HTTP Authorization header string
string httpAuthorizationHeaderString = "OAuth ";
foreach (var item in oauthParams)
{
QueryParameter p = (QueryParameter)item;
httpAuthorizationHeaderString += p.Key + "=\"" + HTTPUtility.UrlEncode(p.Value) + "\"";
if (oauthParams.IndexOf(item) < oauthParams.Count - 1)
{
httpAuthorizationHeaderString += ", ";
}
}
// Add the parameters to the query string if this is a GET request
if (method == "GET" && parameters != null)
{
url += "?" + HTTPUtility.ParameterListToQueryString(parameters);
}
// Create the HttpRequest
HttpRequest httpRequest = new HttpRequest(url);
httpRequest.Method = method;
httpRequest.Headers["Authorization"] = httpAuthorizationHeaderString;
SendDebugMessage("Submitting request...");
// Send POST content
if (method == "POST")
{
httpRequest.ContentType = "application/x-www-form-urlencoded";
if (parameters != null)
{
httpRequest.PostContent = HTTPUtility.ParameterListToQueryString(parameters);
}
}
return(httpRequest);
}
