/* -------- private Methods ------------------------------------------------------------------------------------------------------------------ */
/// <summary>
/// Method to add the Oauth body hash to the OAuthParameters
/// </summary>
/// <param name="body"></param>
/// <param name="oparams"></param>
/// <returns></returns>
private OAuthParameters setOauthBodyHashParameter(String body, OAuthParameters oparams)
{
byte[] bodyStringBytes = encoder.GetBytes(body);
SHA1 sha = new SHA1CryptoServiceProvider();
string encodedHash = Convert.ToBase64String(sha.ComputeHash(bodyStringBytes));
oparams.addParameter(OAUTH_BODY_HASH, encodedHash);
return(oparams);
}
/// <summary>
/// Builds the Authorization header
/// </summary>
/// <param name="httpsURL"></param>
/// <param name="requestMethod"></param>
/// <param name="oparams"></param>
/// <returns></returns>
private string buildAuthHeaderString(String httpsURL, String requestMethod, OAuthParameters oparams)
{
generateAndSignSignature(httpsURL, requestMethod, oparams);
StringBuilder buffer = new StringBuilder();
buffer.Append(OAUTH_START_STRING);
buffer = parseParameters(buffer, oparams);
this._authHeader = buffer.ToString();
return(buffer.ToString());
}
/// <summary>
/// Method to build a comma delimited list of key/value string for the signature base string and authorization header
/// </summary>
/// <param name="buffer"></param>
/// <param name="oparams"></param>
/// <returns></returns>
private StringBuilder parseParameters(StringBuilder buffer, OAuthParameters oparams)
{
foreach (KeyValuePair <string, SortedSet <string> > key in oparams.getBaseParameters())
{
SortedSet <string> value = key.Value;
parseSortedSetValues(buffer, key.Key, value);
buffer.Append(COMMA);
}
buffer.Remove(buffer.Length - 1, 1);
return(buffer);
}
/******************** protected and support methods ***************************************************************************************************************************/
protected virtual OAuthParameters OAuthParametersFactory()
{
OAuthParameters oparams = new OAuthParameters();
oparams.addParameter(OAUTH_CONSUMER_KEY, ConsumerKey);
oparams.addParameter(OAUTH_NONCE, getNonce());
oparams.addParameter(OAUTH_TIMESTAMP, getTimestamp());
oparams.addParameter(OAUTH_SIGNATURE_METHOD, RSA_SHA1);
oparams.addParameter(OAUTH_VERSION, ONE_POINT_ZERO);
return(oparams);
}
/// <summary>
/// Setup the HttpWebRequest and connection headers
/// </summary>
/// <param name="httpsURL"></param>
/// <param name="requestMethod"></param>
/// <param name="oparams"></param>
/// <param name="body"></param>
/// <returns></returns>
private HttpWebRequest setupConnection(String httpsURL,
String requestMethod, OAuthParameters oparams, String body)
{
Uri url = new Uri(httpsURL);
HttpWebRequest con = (HttpWebRequest)WebRequest.Create(url);
con.Method = requestMethod;
con.Headers.Add(AUTHORIZATION, buildAuthHeaderString(httpsURL, requestMethod, oparams));
// Setting the Content Type header depending on the body
if (body != null)
{
con.ContentType = APPLICATION_XML;
con.ContentLength = body.Length;
}
return(con);
}
/// <summary>
/// Normalize the OAuth parameters as they are added to the signature base string
/// </summary>
/// <param name="httpUrl"></param>
/// <param name="requestParameters"></param>
/// <returns></returns>
private static String normalizeParameters(String httpUrl, OAuthParameters requestParameters)
{
// add the querystring to the base string (if one exists)
if (httpUrl.IndexOf(QUESTION_MARK) > 0)
{
NameValueCollection queryParameters = HttpUtility.ParseQueryString(httpUrl.Substring(httpUrl.IndexOf(QUESTION_MARK) + 1));
foreach (string key in queryParameters)
{
requestParameters.put(key, UrlEncodeRfc3986(queryParameters[key]));
}
}
// piece together the base string, encoding each key and value
StringBuilder paramString = new StringBuilder();
foreach (KeyValuePair <string, SortedSet <string> > kvp in requestParameters.getBaseParameters())
{
if (kvp.Value.Count == 0)
{
continue; // Skip if key doesn't have any values
}
if (paramString.Length > 0)
{
paramString.Append(AMP);
}
int tempCounter = 0;
foreach (string value in kvp.Value.Keys)
{
paramString.Append(UrlEncodeRfc3986(kvp.Key)).Append(EQUALS).Append((value));
if (tempCounter != kvp.Value.Count - 1)
{
paramString.Append(AMP);
}
tempCounter++;
}
}
return(paramString.ToString());
}
/// <summary>
/// Method to build a comma delimited list of key/value string for the signature base string and authorization header
/// </summary>
/// <param name="buffer"></param>
/// <param name="oparams"></param>
/// <returns></returns>
private StringBuilder parseParameters(StringBuilder buffer, OAuthParameters oparams)
{
foreach (KeyValuePair<string, SortedSet<string>> key in oparams.getBaseParameters())
{
SortedSet<string> value = key.Value;
parseSortedSetValues(buffer, key.Key, value);
buffer.Append(COMMA);
}
buffer.Remove(buffer.Length - 1, 1);
return buffer;
}
/// <summary>
/// Generates the signature base string
/// </summary>
/// <param name="httpsURL"></param>
/// <param name="requestMethod"></param>
/// <param name="oparams"></param>
/// <returns></returns>
private string generateSignatureBaseString(string httpsURL, string requestMethod, OAuthParameters oparams)
{
Uri requestUri = parseUrl(httpsURL);
String encodedBaseString;
encodedBaseString = UrlEncodeRfc3986(requestMethod.ToUpper()) + AMP + UrlEncodeRfc3986(normalizeUrl(requestUri)) + AMP + UrlEncodeRfc3986(normalizeParameters(httpsURL, oparams));
return encodedBaseString;
}
/// <summary>
/// Generates and signs the signature base string
/// </summary>
/// <param name="httpsURL"></param>
/// <param name="requestMethod"></param>
/// <param name="oparams"></param>
/// <returns></returns>
private string generateAndSignSignature(String httpsURL, String requestMethod, OAuthParameters oparams)
{
OAuthParameters sbsParams = new OAuthParameters();
sbsParams.putAll(oparams.getBaseParameters());
string realm = null;
if (sbsParams.get(REALM) != EMPTY_STRING)
{
realm = sbsParams.get(REALM);
sbsParams.remove(REALM, null);
}
String baseString;
baseString = generateSignatureBaseString(httpsURL, requestMethod, sbsParams);
_signatureBaseString = baseString;
String signature;
signature = sign(baseString, privateKey);
oparams.addParameter(OAUTH_SIGNATURE, signature);
if (realm != null)
{
sbsParams.put(REALM, realm);
}
return signature;
}
/// <summary>
/// Builds the Authorization header
/// </summary>
/// <param name="httpsURL"></param>
/// <param name="requestMethod"></param>
/// <param name="oparams"></param>
/// <returns></returns>
private string buildAuthHeaderString(String httpsURL, String requestMethod, OAuthParameters oparams)
{
generateAndSignSignature(httpsURL, requestMethod, oparams);
StringBuilder buffer = new StringBuilder();
buffer.Append(OAUTH_START_STRING);
buffer = parseParameters(buffer, oparams);
this._authHeader = buffer.ToString();
return buffer.ToString();
}
/// <summary>
/// Normalize the OAuth parameters as they are added to the signature base string
/// </summary>
/// <param name="httpUrl"></param>
/// <param name="requestParameters"></param>
/// <returns></returns>
private static String normalizeParameters(String httpUrl, OAuthParameters requestParameters)
{
// add the querystring to the base string (if one exists)
if (httpUrl.IndexOf(QUESTION_MARK) > 0)
{
NameValueCollection queryParameters = HttpUtility.ParseQueryString(httpUrl.Substring(httpUrl.IndexOf(QUESTION_MARK) + 1));
foreach (string key in queryParameters)
{
requestParameters.put(key, UrlEncodeRfc3986(queryParameters[key]));
}
}
// piece together the base string, encoding each key and value
StringBuilder paramString = new StringBuilder();
foreach (KeyValuePair<string, SortedSet<string>> kvp in requestParameters.getBaseParameters())
{
if (kvp.Value.Count == 0)
{
continue; // Skip if key doesn't have any values
}
if (paramString.Length > 0)
{
paramString.Append(AMP);
}
int tempCounter = 0;
foreach (string value in kvp.Value.Keys)
{
paramString.Append(UrlEncodeRfc3986(kvp.Key)).Append(EQUALS).Append((value));
if (tempCounter != kvp.Value.Count - 1)
{
paramString.Append(AMP);
}
tempCounter++;
}
}
return paramString.ToString();
}
/******************** protected and support methods ***************************************************************************************************************************/
protected virtual OAuthParameters OAuthParametersFactory()
{
OAuthParameters oparams = new OAuthParameters();
oparams.addParameter(OAUTH_CONSUMER_KEY, ConsumerKey);
oparams.addParameter(OAUTH_NONCE, getNonce());
oparams.addParameter(OAUTH_TIMESTAMP, getTimestamp());
oparams.addParameter(OAUTH_SIGNATURE_METHOD, RSA_SHA1);
oparams.addParameter(OAUTH_VERSION, ONE_POINT_ZERO);
return oparams;
}
/* -------- private Methods ------------------------------------------------------------------------------------------------------------------ */
/// <summary>
/// Method to add the Oauth body hash to the OAuthParameters
/// </summary>
/// <param name="body"></param>
/// <param name="oparams"></param>
/// <returns></returns>
private OAuthParameters setOauthBodyHashParameter(string body, OAuthParameters oparams)
{
byte[] bodyStringBytes = encoder.GetBytes(body);
using (var sha = new SHA1CryptoServiceProvider())
{
try
{
string encodedHash = Convert.ToBase64String(sha.ComputeHash(bodyStringBytes));
oparams.addParameter(OAUTH_BODY_HASH, encodedHash);
return oparams;
}
catch (CryptographicException cex)
{
throw new MCApiRuntimeException(cex.Message, cex);
}
}
}
/// <summary>
/// Generates the signature base string
/// </summary>
/// <param name="httpsURL"></param>
/// <param name="requestMethod"></param>
/// <param name="oparams"></param>
/// <returns></returns>
private string generateSignatureBaseString(string httpsURL, string requestMethod, OAuthParameters oparams)
{
Uri requestUri = parseUrl(httpsURL);
String encodedBaseString;
encodedBaseString = UrlEncodeRfc3986(requestMethod.ToUpper()) + AMP + UrlEncodeRfc3986(normalizeUrl(requestUri)) + AMP + UrlEncodeRfc3986(normalizeParameters(httpsURL, oparams));
return(encodedBaseString);
}
/// <summary>
/// Generates and signs the signature base string
/// </summary>
/// <param name="httpsURL"></param>
/// <param name="requestMethod"></param>
/// <param name="oparams"></param>
/// <returns></returns>
private string generateAndSignSignature(String httpsURL, String requestMethod, OAuthParameters oparams)
{
OAuthParameters sbsParams = new OAuthParameters();
sbsParams.putAll(oparams.getBaseParameters());
string realm = null;
if (sbsParams.get(REALM) != EMPTY_STRING)
{
realm = sbsParams.get(REALM);
sbsParams.remove(REALM, null);
}
String baseString;
baseString = generateSignatureBaseString(httpsURL, requestMethod, sbsParams);
_signatureBaseString = baseString;
String signature;
signature = sign(baseString, privateKey);
oparams.addParameter(OAUTH_SIGNATURE, signature);
if (realm != null)
{
sbsParams.put(REALM, realm);
}
return(signature);
}
/* -------- private Methods ------------------------------------------------------------------------------------------------------------------ */
/// <summary>
/// Method to add the Oauth body hash to the OAuthParameters
/// </summary>
/// <param name="body"></param>
/// <param name="oparams"></param>
/// <returns></returns>
private OAuthParameters setOauthBodyHashParameter(String body, OAuthParameters oparams)
{
byte[] bodyStringBytes = encoder.GetBytes(body);
SHA1 sha = new SHA1CryptoServiceProvider();
string encodedHash = Convert.ToBase64String(sha.ComputeHash(bodyStringBytes));
oparams.addParameter(OAUTH_BODY_HASH, encodedHash);
return oparams;
}
/// <summary>
/// Setup the HttpWebRequest and connection headers
/// </summary>
/// <param name="httpsURL"></param>
/// <param name="requestMethod"></param>
/// <param name="oparams"></param>
/// <param name="body"></param>
/// <returns></returns>
private HttpWebRequest setupConnection(String httpsURL,
String requestMethod, OAuthParameters oparams, String body)
{
Uri url = new Uri(httpsURL);
HttpWebRequest con = (HttpWebRequest)WebRequest.Create(url);
con.Method = requestMethod;
con.Headers.Add(AUTHORIZATION, buildAuthHeaderString(httpsURL, requestMethod, oparams));
// Setting the Content Type header depending on the body
if (body != null)
{
con.ContentType = APPLICATION_XML;
con.ContentLength = body.Length;
}
return con;
}
/// <summary>
/// Method to handle all Api connection details.
/// </summary>
/// <param name="httpsURL"></param>
/// <param name="requestMethod"></param>
/// <param name="oparams"></param>
/// <param name="body"></param>
/// <returns></returns>
protected Dictionary<string, string> doRequest(String httpsURL, String requestMethod,
OAuthParameters oparams, String body)
{
try
{
if (privateKey == null)
{
throw new MCApiRuntimeException(NULL_PRIVATEKEY_ERROR_MESSAGE);
}
if (body != null && body.Length > 0)
{
oparams = setOauthBodyHashParameter(body, oparams);
}
HttpWebRequest con = setupConnection(httpsURL, requestMethod, oparams, body);
if (body != null)
{
writeBodyToConnection(body, con);
}
return checkForErrorsAndReturnRepsonse(con);
}
catch (Exception e)
{
throw new MCApiRuntimeException(e.Message, e);
}
}
