So far as I can tell, I'm following the instructions accurately
according to http://dev.twitter.com/pages/auth, but regardless of any
minute variations, I keep getting a 401, authorization error on
posting (i.e. the method pushMessage() fails). So far as I can tell,
I'm not doing anything different, other than using POST, than I did
during the initial authorization.
public class Twitter {
private string tokenSecret = "";
private string createTimestamp() {
var now = DateTime.UtcNow;
var then = new DateTime(1970, 1, 1);
var timespan = now - then;
return ("" + (long)timespan.TotalSeconds);
}
private string createNonce() {
const string ALPHANUMERIC =
"qwertyuiopasdfghjklzxcvbnm"
+ "QWERTYUIOPASDFGHJKLZXCVBNM"
+ "1234567890"
;
var sb = new StringBuilder();
var random = new Random();
for (int L = 0; L < 42; L++)
{
sb.Append(
ALPHANUMERIC[random.Next(ALPHANUMERIC.Length)]
);
}
return sb.ToString();
}
private string createSignature(string signatureBase) {
string key = clientSecret + "&" + tokenSecret;
var keyBytes = Encoding.UTF8.GetBytes(key);
var sigMethod = new HMACSHA1(keyBytes);
byte[] data = Encoding.UTF8.GetBytes(signatureBase);
var hash = sigMethod.ComputeHash(data);
var sig = Convert.ToBase64String(hash);
sig = Uri.EscapeDataString(sig);
return sig;
}
private void myInit() {
int found = 0;
string[] words = sessionData.Split('&');
for (uint L = 0; L < words.Length; L++)
{
if (words[L].StartsWith("oauth_token="))
{
++found;
accessToken = words[L];
}
else if (words[L].StartsWith("oauth_token_secret="))
{
++found;
tokenSecret =
words[L].Substring("oauth_token_secret=".Length);
}
else if (words[L].StartsWith("user_id=")) {
++found;
userID = words[L].Substring("user_id=".Length);
}
else if (words[L].StartsWith("screen_name=")) {
++found;
screenName =
words[L].Substring("screen_name=".Length);
}
}
if (found != 4) {
throw new Exception("Unknown response from server");
}
}
public new void createSession(System.Web.UI.Page page)
{
if (
!string.IsNullOrEmpty(page.Request.QueryString["oauth_token"])
) {
string timestamp = createTimestamp();
string nonce = createNonce();
var sigBase =
"GET"
+ "&" +
Uri.EscapeDataString("https://api.twitter.com/oauth/
access_token")
+ "&" +
Uri.EscapeDataString("oauth_consumer_key=" + clientID)
+ "%26" + Uri.EscapeDataString("oauth_nonce=" +
nonce)
+ "%26" +
Uri.EscapeDataString("oauth_signature_method=HMAC-SHA1")
+ "%26" +
Uri.EscapeDataString("oauth_timestamp=" + timestamp)
+ "%26" + Uri.EscapeDataString("oauth_token=" +
page.Request.QueryString["oauth_token"])
+ "%26" +
Uri.EscapeDataString("oauth_version=1.0")
;
string signature = createSignature(sigBase);
string url =
"https://api.twitter.com/oauth/access_token";;
WebClient client = new WebClient();
client.Headers["Authorization"] =
"OAuth "
+ "oauth_consumer_key=\"" + clientID + "\", "
+ "oauth_nonce=\"" + nonce + "\", "
+ "oauth_signature=\"" + signature + "\", "
+ "oauth_signature_method=\"HMAC-SHA1\", "
+ "oauth_timestamp=\"" + timestamp + "\", "
+ "oauth_token=\"" +
page.Request.QueryString["oauth_token"] +
"\", "
+ "oauth_version=\"1.0\""
;
byte[] data = client.DownloadData(url);
sessionData = Encoding.UTF8.GetString(data);
myInit();
}
else {
string timestamp = createTimestamp();
string nonce = createNonce();
var sigBase =
"GET"
+ "&" +
Uri.EscapeDataString("https://api.twitter.com/oauth/
request_token")
+ "&" +
Uri.EscapeDataString("oauth_consumer_key=" + clientID)
+ "%26" + Uri.EscapeDataString("oauth_nonce=" +
nonce)
+ "%26" +
Uri.EscapeDataString("oauth_signature_method=HMAC-SHA1")
+ "%26" +
Uri.EscapeDataString("oauth_timestamp=" + timestamp)
+ "%26" +
Uri.EscapeDataString("oauth_version=1.0")
;
string signature = createSignature(sigBase);
string url =
"https://api.twitter.com/oauth/request_token";;
WebClient client = new WebClient();
client.Headers["Authorization"] =
"OAuth oauth_consumer_key=\"" + clientID + "\",
"
+ "oauth_nonce=\"" + nonce + "\", "
+ "oauth_signature=\"" + signature + "\", "
+ "oauth_signature_method=\"HMAC-SHA1\", "
+ "oauth_timestamp=\"" + timestamp + "\", "
+ "oauth_version=\"1.0\""
;
byte[] data = client.DownloadData(url);
string requestToken = Encoding.UTF8.GetString(data);
bool found = false;
string[] words = requestToken.Split('&');
for (uint L = 0; L < words.Length; L++) {
if (words[L].StartsWith("oauth_token="))
{
found = true;
requestToken = words[L];
break;
}
}
if (!found) {
throw new Exception("Unknown response from
Twitter server");
}
page.Response.Redirect(
"https://api.twitter.com/oauth/authorize?";
+ requestToken
);
}
}
public new void continueSession(string data)
{
sessionData = data;
myInit();
}
public new void pushMessage(string message) {
string timestamp = createTimestamp();
string nonce = createNonce();
var sigBase =
"POST"
+ "&" +
Uri.EscapeDataString("http://api.twitter.com/1/statuses/
update.json")
+ "&" + Uri.EscapeDataString("oauth_consumer_key=" +
clientID)
+ "%26" + Uri.EscapeDataString("oauth_nonce=" + nonce)
+ "%26" +
Uri.EscapeDataString("oauth_signature_method=HMAC-SHA1")
+ "%26" + Uri.EscapeDataString("oauth_timestamp=" +
timestamp)
+ "%26" + Uri.EscapeDataString(accessToken)
+ "%26" + Uri.EscapeDataString("oauth_version=1.0")
+ "%26" + Uri.EscapeDataString("status=" + message)
;
string signature = createSignature(sigBase);
string url = "http://api.twitter.com/1/statuses/update.json";;
var request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";
request.Headers["Authorization"] =
"OAuth "
+ "oauth_nonce=\"" + nonce + "\","
+ "oauth_signature_method=\"HMAC-SHA1\","
+ "oauth_timestamp=\"" + timestamp + "\","
+ "oauth_consumer_key=\"" + clientID + "\","
+ "oauth_token=\"" +
accessToken.Substring("oauth_token=".Length) +
"\","
+ "oauth_signature=\"" + signature + "\","
+ "oauth_version=\"1.0\""
;
byte[] data = Encoding.UTF8.GetBytes("status=" + message);
request.ServicePoint.Expect100Continue = false;
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
using (Stream stream = request.GetRequestStream()) {
stream.Write(data, 0, data.Length);
}
request.GetResponse();
}
}
--
Twitter developer documentation and resources: http://dev.twitter.com/doc
API updates via Twitter: http://twitter.com/twitterapi
Issues/Enhancements Tracker: http://code.google.com/p/twitter-api/issues/list
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