Following this tutorial I was able to perform a successful post to the Twitter API and update my status.
However I am having trouble processing a successful GET request. I am trying to modify the Post request to accomplish this but keep getting “Invalid Protocol” errors on my web exception.
The following is the working code that will Post a status update. https://dev.twitter.com/docs/api/1.1/post/statuses/update
I tried to modify the code to perfrom the following GET request
https://dev.twitter.com/docs/api/1.1/get/statuses/user_timeline
I know I need to add the screen_name or user id parameter that the get request requires.
I need to change the base format and string to contain the correct parameters and request.
I tried adding the screen name to the headerformat and auth header. (not sure if needed)
And If I understand correctly get requests don’t require a body.
I tinkered with this code for a while trying to convert it to a get request without success.
How is it done?
Working Post request
public ActionResult Test2()
{
//Auth
var oauth_token = "161946489-uLEUgIqbQ..."; //user
var oauth_token_secret = "kVfAfW6GIbfc....";
var oauth_consumer_key = "kvXJFgjsLGKs..."; //this is my app
var oauth_consumer_secret = "2cgBSQyZS...";
//Request details
var oauth_version = "1.0";
var oauth_signature_method = "HMAC-SHA1";
var oauth_nonce = Convert.ToBase64String(new ASCIIEncoding().GetBytes(DateTime.Now.Ticks.ToString()));
var timeSpan = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
var oauth_timestamp = Convert.ToInt64(timeSpan.TotalSeconds).ToString();
var resource_url = "https://api.twitter.com/1.1/statuses/update.json";
var status = "Updating status via REST API if this works again";
//var screen_name = "ScreenName";
//encrypted oAuth signature
var baseFormat = "oauth_consumer_key={0}&oauth_nonce={1}&oauth_signature_method={2}" +
"&oauth_timestamp={3}&oauth_token={4}&oauth_version={5}&status={6}";
var baseString = string.Format(baseFormat,
oauth_consumer_key,
oauth_nonce,
oauth_signature_method,
oauth_timestamp,
oauth_token,
oauth_version,
Uri.EscapeDataString(status)
);
baseString = string.Concat("POST&", Uri.EscapeDataString(resource_url),
"&", Uri.EscapeDataString(baseString));
//Encrypt data
var compositeKey = string.Concat(Uri.EscapeDataString(oauth_consumer_secret),
"&", Uri.EscapeDataString(oauth_token_secret));
string oauth_signature;
using (HMACSHA1 hasher = new HMACSHA1(ASCIIEncoding.ASCII.GetBytes(compositeKey)))
{
oauth_signature = Convert.ToBase64String(
hasher.ComputeHash(ASCIIEncoding.ASCII.GetBytes(baseString)));
}
//Finish Auth header
var headerFormat = "OAuth oauth_nonce=\"{0}\", oauth_signature_method=\"{1}\", " +
"oauth_timestamp=\"{2}\", oauth_consumer_key=\"{3}\", " +
"oauth_token=\"{4}\", oauth_signature=\"{5}\", " +
"oauth_version=\"{6}\"";
var authHeader = string.Format(headerFormat,
Uri.EscapeDataString(oauth_nonce),
Uri.EscapeDataString(oauth_signature_method),
Uri.EscapeDataString(oauth_timestamp),
Uri.EscapeDataString(oauth_consumer_key),
Uri.EscapeDataString(oauth_token),
Uri.EscapeDataString(oauth_signature),
Uri.EscapeDataString(oauth_version)
);
//Disable exprect 100 continue header
var postBody = "status=" + Uri.EscapeDataString(status);
ServicePointManager.Expect100Continue = false;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(resource_url);
request.Headers.Add("Authorization", authHeader);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
using (Stream stream = request.GetRequestStream())
{
byte[] content = ASCIIEncoding.ASCII.GetBytes(postBody);
stream.Write(content, 0, content.Length);
}
try
{
WebResponse response = request.GetResponse();
ViewBag.Message = response.ToString();
}
catch (WebException e)
{
ViewBag.Message = e.Status;
}
My nonworking attempt at a Get request
//Request details
var oauth_version = "1.0";
var oauth_signature_method = "HMAC-SHA1";
var oauth_nonce = Convert.ToBase64String(new ASCIIEncoding().GetBytes(DateTime.Now.Ticks.ToString()));
var timeSpan = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
var oauth_timestamp = Convert.ToInt64(timeSpan.TotalSeconds).ToString();
var resource_url = "https://api.twitter.com/1.1/statuses/user_timeline.json";
var status = "Updating status via REST API if this works again";
var screen_name = "Starcraft2foru";
//encrypted oAuth signature
var baseFormat = "oauth_consumer_key={0}&oauth_nonce={1}&oauth_signature_method={2}" +
"&oauth_timestamp={3}&oauth_token={4}&oauth_version={5}&screen_name={6}";
var baseString = string.Format(baseFormat,
oauth_consumer_key,
oauth_nonce,
oauth_signature_method,
oauth_timestamp,
oauth_token,
oauth_version,
Uri.EscapeDataString(screen_name)
);
baseString = string.Concat("GET&", Uri.EscapeDataString(resource_url),
"&", Uri.EscapeDataString(baseString));
//Encrypt data
var compositeKey = string.Concat(Uri.EscapeDataString(oauth_consumer_secret),
"&", Uri.EscapeDataString(oauth_token_secret));
string oauth_signature;
using (HMACSHA1 hasher = new HMACSHA1(ASCIIEncoding.ASCII.GetBytes(compositeKey)))
{
oauth_signature = Convert.ToBase64String(
hasher.ComputeHash(ASCIIEncoding.ASCII.GetBytes(baseString)));
}
//Finish Authentification header
var headerFormat = "OAuth oauth_nonce=\"{0}\", oauth_signature_method=\"{1}\", " +
"oauth_timestamp=\"{2}\", oauth_consumer_key=\"{3}\", " +
"oauth_token=\"{4}\", oauth_signature=\"{5}\", " +
"oauth_version=\"{6}\", screen_name=\"{7}\"";
var authHeader = string.Format(headerFormat,
Uri.EscapeDataString(oauth_nonce),
Uri.EscapeDataString(oauth_signature_method),
Uri.EscapeDataString(oauth_timestamp),
Uri.EscapeDataString(oauth_consumer_key),
Uri.EscapeDataString(oauth_token),
Uri.EscapeDataString(oauth_signature),
Uri.EscapeDataString(oauth_version),
Uri.EscapeDataString(screen_name)
);
//Disable exprect 100 continue header
var postBody = "screen_name=" + Uri.EscapeDataString(screen_name);
ServicePointManager.Expect100Continue = false;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(resource_url);
request.Headers.Add("Authorization", authHeader);
request.Method = "GET";
request.ContentType = "application/x-www-form-urlencoded";
/*using (Stream stream = request.GetRequestStream())
{
byte[] content = ASCIIEncoding.ASCII.GetBytes(postBody);
stream.Write(content, 0, content.Length);
}
*/
try
{
WebResponse response = request.GetResponse();
ViewBag.Message = response.ToString();
}
catch (WebException e)
{
ViewBag.Message = e.Status;
}
You do not have to pass the screen name parameter through the header. Pass it as a query string to the request URL:
UPDATE: This is completely untested so I apologize if there are some errors. (I use
DotNetOpenAuthin my application so I don’t have to worry about these OAuth details.) Most of the following is your code from your question, just made a few changes to it. Also, be sure to use the Twitter API Console to test all your calls to see if they are valid.