Hi All,
Can any one please help here. I am struggling since last 4 weeks to get media upload working. I am getting 401 Unauthorized Error. I am running out of options now. Please help. I am posting my entire c# code here. Please let me know what is the actual issue here. I have also gone through the guide to upload media documentation, there it says to remove POST from the base string, also did that but still no luck.
public void SendStatusWithMedia()
{
var file = @"C:\Users\admin.XXX\Desktop\FreeElectricity.png";
byte[] imageData = File.ReadAllBytes(file);
int totalbytes = imageData.Length;
Encoding EncodingAlgorithm = Encoding.GetEncoding("iso-8859-1");
string Boundary = DateTime.Now.Ticks.ToString("x");
string StartBoundary = string.Format("--{0}\r\n", Boundary);
string EndBoundary = string.Format("\r\n--{0}\r\n", Boundary);
string sContentType = "multipart/form-data;boundary=" + Boundary;
string contentDisposition = "Content-Disposition: form-data; ";
string contenName = "name=\"Media\";\r\n ";
string Data = EncodingAlgorithm.GetString(imageData, 0, imageData.Length);
var contents = new System.Text.StringBuilder();
contents.Append(String.Format("{0}{1}{2}{3}{4}", StartBoundary, contentDisposition, contenName, sContentType, Data));
contents.Append(EndBoundary);
byte[] Content = EncodingAlgorithm.GetBytes(contents.ToString());
string oauth_consumer_key = "XXXXXXXXXXXXXXX";
string oauth_consumerSecret = "XXXXXXXXXXXXXXXX";
string oauth_signature_method = "HMAC-SHA1";
string oauth_version = "1.0";
string oauth_token = "XXXXXXXXXXXXXXXXXXXXX";
string oauth_token_secret = "XXXXXXXXXXXXXXXXXXX";
string oauth_nonce = Convert.ToBase64String(new ASCIIEncoding().GetBytes(DateTime.Now.Ticks.ToString()));
TimeSpan timeSpan = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
string oauth_timestamp = Convert.ToInt64(timeSpan.TotalSeconds).ToString();
string url =string.Format("https://upload.twitter.com/1.1/media/upload.json");
SortedDictionary<string, string> basestringParameters = new SortedDictionary<string, string>();
basestringParameters.Add("oauth_version", oauth_version);
basestringParameters.Add("oauth_consumer_key", oauth_consumer_key);
basestringParameters.Add("oauth_nonce", oauth_nonce);
basestringParameters.Add("oauth_signature_method", oauth_signature_method);
basestringParameters.Add("oauth_timestamp", oauth_timestamp);
basestringParameters.Add("oauth_token", oauth_token);
basestringParameters.Add("oauth_token_secret", oauth_token_secret);
//Build the signature string
StringBuilder baseString = new StringBuilder();
baseString.Append("POST" + "&");
baseString.Append(EncodeCharacters(Uri.EscapeDataString(url + "&")));
foreach (KeyValuePair<string, string> entry in basestringParameters)
{
baseString.Append(EncodeCharacters(Uri.EscapeDataString(entry.Key + "=" + entry.Value + "&")));
}
//GS - Remove the trailing ambersand char, remember
//it's been urlEncoded so you have to remove the
//last 3 chars - %26
string finalBaseString = baseString.ToString().Substring(0, baseString.Length - 3);
//Build the signing key
string signingKey = EncodeCharacters(Uri.EscapeDataString(oauth_consumerSecret)) + "&" +
EncodeCharacters(Uri.EscapeDataString(oauth_token_secret));
//Sign the request
HMACSHA1 hasher = new HMACSHA1(new ASCIIEncoding().GetBytes(signingKey));
string signatureString = Convert.ToBase64String(hasher.ComputeHash(new ASCIIEncoding().GetBytes(finalBaseString)));
//Tell Twitter we don't do the 100 continue thing
ServicePointManager.Expect100Continue = false;
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(@url);
StringBuilder authorizationHeaderParams = new StringBuilder();
authorizationHeaderParams.Append("OAuth ");
authorizationHeaderParams.Append("oauth_nonce=" + "\"" + Uri.EscapeDataString(oauth_nonce) + "\",");
authorizationHeaderParams.Append("oauth_signature_method=" + "\"" + Uri.EscapeDataString(oauth_signature_method) + "\",");
authorizationHeaderParams.Append("oauth_timestamp=" + "\"" + Uri.EscapeDataString(oauth_timestamp) + "\",");
authorizationHeaderParams.Append("oauth_consumer_key=" + "\"" + Uri.EscapeDataString(oauth_consumer_key) + "\",");
authorizationHeaderParams.Append("oauth_token=" + "\"" + Uri.EscapeDataString(oauth_token) + "\",");
authorizationHeaderParams.Append("oauth_token_secret=" + "\"" + Uri.EscapeDataString(oauth_token_secret) + "\",");
authorizationHeaderParams.Append("oauth_signature=" + "\"" + Uri.EscapeDataString(signatureString) + "\",");
authorizationHeaderParams.Append("oauth_version=" + "\"" + Uri.EscapeDataString(oauth_version) + "\"");
webRequest.Headers.Add("Authorization", authorizationHeaderParams.ToString());
webRequest.Method = "POST";
webRequest.ContentType = sContentType;
webRequest.ContentLength = Content.Length;
Stream requestStream = webRequest.GetRequestStream();
requestStream.Write(Content, 0, Content.Length);
requestStream.Close();
//Allow us a reasonable timeout in case Twitter's busy
webRequest.Timeout = 3 * 60 * 1000;
try
{
// webRequest.Proxy = new WebProxy("enter proxy details/address");
HttpWebResponse webResponse = webRequest.GetResponse() as HttpWebResponse;
Stream dataStream = webResponse.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd();
}
catch (Exception ex)
{
}
}
private string EncodeCharacters(string data)
{
//as per OAuth Core 1.0 Characters in the unreserved character set MUST NOT be encoded
//unreserved = ALPHA, DIGIT, '-', '.', '_', '~'
if (data.Contains("!"))
data = data.Replace("!", "%21");
if (data.Contains("'"))
data = data.Replace("'", "%27");
if (data.Contains("("))
data = data.Replace("(", "%28");
if (data.Contains(")"))
data = data.Replace(")", "%29");
if (data.Contains("*"))
data = data.Replace("*", "%2A");
if (data.Contains(","))
data = data.Replace(",", "%2C");
return data;
}
