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POOauth, Twitter, 401 Unauthorised
 

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    <p>I want to break away from Twitsharp and utilise the User Streaming in twitter, in order to do this I need to write my own oAuth for authenticating my requests against the API. </p> <p>Having never had to do this I'm really struggling to implement it. I found an excellent example (<a href="http://garyshortblog.wordpress.com/2011/02/11/a-twitter-oauth-example-in-c/" rel="nofollow">http://garyshortblog.wordpress.com/2011/02/11/a-twitter-oauth-example-in-c/</a>) which I'm attempting to use to understand how to write my own. However I can't even get the example to work. Each time run it I always encounter 401 Unauthorised. My tokens etc. are fine, they work under Twitsharp. If I make a comparison using fiddler between a Twitsharp request and mine, they are exactly the same with the exception of the oauth_nonce and oauth_signature.</p> <p>This is what I have so far, thoughts appreciated. </p> <p><strong>Headers:</strong></p> <p>GOOD - Working with Twitsharp</p> <pre><code>oauth_consumer_key="xxx", oauth_nonce="eyn5x7hhj06tr8ic", oauth_signature="aZa5Fg7%2FO%2BbSlO9cYTL7OYLpkAM%3D", oauth_signature_method="HMAC-SHA1", oauth_timestamp="1332540179", oauth_token="xxx", oauth_version="1.0" </code></pre> <hr> <p>BAD - My Example</p> <pre><code>oauth_consumer_key="xxx", oauth_nonce="NjM0NjgxMzgyNDQ5MTgxMDk5", oauth_signature="bSryjrvc1t4kMaIpXCGe7uAFmUI%3D", oauth_signature_method="HMAC-SHA1", oauth_timestamp="1332541445", oauth_token="xxx", oauth_version="1.0" </code></pre> <p>Code:</p> <pre><code> /// &lt;summary&gt; /// The set of characters that are unreserved in RFC 2396 but are NOT unreserved in RFC 3986. /// &lt;/summary&gt; private static readonly string[] UriRfc3986CharsToEscape = new[] { "!", "*", "'", "(", ")" }; /// &lt;summary&gt; /// Escapes a string according to the URI data string rules given in RFC 3986. /// &lt;/summary&gt; /// &lt;param name="value"&gt;The value to escape.&lt;/param&gt; /// &lt;returns&gt;The escaped value.&lt;/returns&gt; /// &lt;remarks&gt; /// The &lt;see cref="Uri.EscapeDataString"/&gt; method is &lt;i&gt;supposed&lt;/i&gt; to take on /// RFC 3986 behavior if certain elements are present in a .config file. Even if this /// actually worked (which in my experiments it &lt;i&gt;doesn't&lt;/i&gt;), we can't rely on every /// host actually having this configuration element present. /// &lt;/remarks&gt; internal static string EscapeUriDataStringRfc3986(string value) { // Start with RFC 2396 escaping by calling the .NET method to do the work. // This MAY sometimes exhibit RFC 3986 behavior (according to the documentation). // If it does, the escaping we do that follows it will be a no-op since the // characters we search for to replace can't possibly exist in the string. StringBuilder escaped = new StringBuilder(Uri.EscapeDataString(value)); // Upgrade the escaping to RFC 3986, if necessary. for (int i = 0; i &lt; UriRfc3986CharsToEscape.Length; i++) { escaped.Replace(UriRfc3986CharsToEscape[i], Uri.HexEscape(UriRfc3986CharsToEscape[i][0])); } // Return the fully-RFC3986-escaped string. return escaped.ToString(); } public static void UserStream() { //GS - Get the oAuth params string status = "statusUpdate112"; string postBody = "status=" + EscapeUriDataStringRfc3986(status); string oauth_consumer_key = _consumerKey; string oauth_nonce = Convert.ToBase64String( new ASCIIEncoding().GetBytes( DateTime.Now.Ticks.ToString())); string oauth_signature_method = "HMAC-SHA1"; string oauth_token = _accessToken; TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc); string oauth_timestamp = Convert.ToInt64(ts.TotalSeconds).ToString(); string oauth_version = "1.0"; //GS - When building the signature string the params //must be in alphabetical order. I can't be bothered //with that, get SortedDictionary to do it's thing SortedDictionary&lt;string, string&gt; sd = new SortedDictionary&lt;string, string&gt;(); sd.Add("status", status); sd.Add("oauth_version", oauth_version); sd.Add("oauth_consumer_key", oauth_consumer_key); sd.Add("oauth_nonce", oauth_nonce); sd.Add("oauth_signature_method", oauth_signature_method); sd.Add("oauth_timestamp", oauth_timestamp); sd.Add("oauth_token", oauth_token); //GS - Build the signature string string baseString = String.Empty; baseString += "POST" + "&amp;"; baseString += EscapeUriDataStringRfc3986( "http://api.twitter.com/1/statuses/update.json") + "&amp;"; foreach (KeyValuePair&lt;string, string&gt; entry in sd) { baseString += EscapeUriDataStringRfc3986(entry.Key + "=" + entry.Value + "&amp;"); } //GS - Remove the trailing ambersand char, remember //it's been urlEncoded so you have to remove the //last 3 chars - %26 baseString = baseString.Substring(0, baseString.Length - 3); //GS - Build the signing key string consumerSecret = _consumerSecret; string oauth_token_secret = _accessTokenSecret; string signingKey = EscapeUriDataStringRfc3986(consumerSecret) + "&amp;" + EscapeUriDataStringRfc3986(oauth_token_secret); //GS - Sign the request HMACSHA1 hasher = new HMACSHA1( new ASCIIEncoding().GetBytes(signingKey)); string signatureString = Convert.ToBase64String( hasher.ComputeHash( new ASCIIEncoding().GetBytes(baseString))); //GS - Tell Twitter we don't do the 100 continue thing ServicePointManager.Expect100Continue = false; //GS - Instantiate a web request and populate the //authorization header HttpWebRequest hwr = (HttpWebRequest)WebRequest.Create( @"https://api.twitter.com/1/statuses/update.json"); string authorizationHeaderParams = String.Empty; authorizationHeaderParams += "OAuth "; authorizationHeaderParams += "oauth_consumer_key=" + "\"" + EscapeUriDataStringRfc3986( oauth_consumer_key) + "\","; authorizationHeaderParams += "oauth_nonce=" + "\"" + EscapeUriDataStringRfc3986(oauth_nonce) + "\","; authorizationHeaderParams += "oauth_signature=" + "\"" + EscapeUriDataStringRfc3986(signatureString) + "\","; authorizationHeaderParams += "oauth_signature_method=" + "\"" + EscapeUriDataStringRfc3986(oauth_signature_method) + "\","; authorizationHeaderParams += "oauth_timestamp=" + "\"" + EscapeUriDataStringRfc3986(oauth_timestamp) + "\","; authorizationHeaderParams += "oauth_token=" + "\"" + EscapeUriDataStringRfc3986(oauth_token) + "\","; authorizationHeaderParams += "oauth_version=" + "\"" + EscapeUriDataStringRfc3986(oauth_version) + "\""; hwr.Headers.Add( "Authorization", authorizationHeaderParams); //added user agent hwr.UserAgent = "XserT"; //GS - POST off the request hwr.Method = "POST"; hwr.ContentType = "application/x-www-form-urlencoded"; Stream stream = hwr.GetRequestStream(); byte[] bodyBytes = new ASCIIEncoding().GetBytes(postBody); stream.Write(bodyBytes, 0, bodyBytes.Length); stream.Flush(); stream.Close(); //GS - Allow us a reasonable timeout in case //Twitter's busy hwr.Timeout = 3 * 60 * 1000; try { HttpWebResponse rsp = hwr.GetResponse() as HttpWebResponse; hwr.KeepAlive = false; //GS - Do something with the return here... } catch (WebException e) { //GS - Do some clever error handling here... } } </code></pre>
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    1. COI hope you are using your own application now, not Twitsharp's consumer key?
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    2. COno? why would I be using Twitsharp's consumer key?
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