Permalink
Switch branches/tags
Nothing to show
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
276 lines (221 sloc) 8.13 KB
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Net;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;
using System.Web.Script.Serialization;
namespace TinyTwitter
{
public class OAuthInfo
{
public string ConsumerKey { get; set; }
public string ConsumerSecret { get; set; }
public string AccessToken { get; set; }
public string AccessSecret { get; set; }
}
public class Tweet
{
public long Id { get; set; }
public DateTime CreatedAt { get; set; }
public string UserName { get; set; }
public string ScreenName { get; set; }
public string Text { get; set; }
}
public class TinyTwitter
{
private readonly OAuthInfo oauth;
public TinyTwitter(OAuthInfo oauth)
{
this.oauth = oauth;
}
public void UpdateStatus(string message)
{
new RequestBuilder(oauth, "POST", "https://api.twitter.com/1.1/statuses/update.json")
.AddParameter("status", message)
.Execute();
}
public IEnumerable<Tweet> GetHomeTimeline(long? sinceId = null, long? maxId = null, int? count = 20)
{
return GetTimeline("https://api.twitter.com/1.1/statuses/home_timeline.json", sinceId, maxId, count, "");
}
public IEnumerable<Tweet> GetMentions(long? sinceId = null, long? maxId = null, int? count = 20)
{
return GetTimeline("https://api.twitter.com/1.1/statuses/mentions.json", sinceId, maxId, count, "");
}
public IEnumerable<Tweet> GetUserTimeline(long? sinceId = null, long? maxId = null, int? count = 20, string screenName = "")
{
return GetTimeline("https://api.twitter.com/1.1/statuses/user_timeline.json", sinceId, maxId, count, screenName);
}
private IEnumerable<Tweet> GetTimeline(string url, long? sinceId, long? maxId, int? count, string screenName)
{
var builder = new RequestBuilder(oauth, "GET", url);
if (sinceId.HasValue)
builder.AddParameter("since_id", sinceId.Value.ToString());
if (maxId.HasValue)
builder.AddParameter("max_id", maxId.Value.ToString());
if (count.HasValue)
builder.AddParameter("count", count.Value.ToString());
if (screenName != "")
builder.AddParameter("screen_name", screenName);
var responseContent = builder.Execute();
var serializer = new JavaScriptSerializer();
var tweets = (object[])serializer.DeserializeObject(responseContent);
return tweets.Cast<Dictionary<string, object>>().Select(tweet =>
{
var user = ((Dictionary<string, object>)tweet["user"]);
var date = DateTime.ParseExact(tweet["created_at"].ToString(),
"ddd MMM dd HH:mm:ss zz00 yyyy",
CultureInfo.InvariantCulture).ToLocalTime();
return new Tweet
{
Id = (long)tweet["id"],
CreatedAt = date,
Text = (string)tweet["text"],
UserName = (string)user["name"],
ScreenName = (string)user["screen_name"]
};
}).ToArray();
}
#region RequestBuilder
public class RequestBuilder
{
private const string VERSION = "1.0";
private const string SIGNATURE_METHOD = "HMAC-SHA1";
private readonly OAuthInfo oauth;
private readonly string method;
private readonly IDictionary<string, string> customParameters;
private readonly string url;
public RequestBuilder(OAuthInfo oauth, string method, string url)
{
this.oauth = oauth;
this.method = method;
this.url = url;
customParameters = new Dictionary<string, string>();
}
public RequestBuilder AddParameter(string name, string value)
{
customParameters.Add(name, value.EncodeRFC3986());
return this;
}
public string Execute()
{
var timespan = GetTimestamp();
var nonce = CreateNonce();
var parameters = new Dictionary<string, string>(customParameters);
AddOAuthParameters(parameters, timespan, nonce);
var signature = GenerateSignature(parameters);
var headerValue = GenerateAuthorizationHeaderValue(parameters, signature);
var request = (HttpWebRequest)WebRequest.Create(GetRequestUrl());
request.Method = method;
request.ContentType = "application/x-www-form-urlencoded";
request.Headers.Add("Authorization", headerValue);
WriteRequestBody(request);
// It looks like a bug in HttpWebRequest. It throws random TimeoutExceptions
// after some requests. Abort the request seems to work. More info:
// http://stackoverflow.com/questions/2252762/getrequeststream-throws-timeout-exception-randomly
var response = request.GetResponse();
string content;
using (var stream = response.GetResponseStream())
{
using (var reader = new StreamReader(stream))
{
content = reader.ReadToEnd();
}
}
request.Abort();
return content;
}
private void WriteRequestBody(HttpWebRequest request)
{
if (method == "GET")
return;
var requestBody = Encoding.ASCII.GetBytes(GetCustomParametersString());
using (var stream = request.GetRequestStream())
stream.Write(requestBody, 0, requestBody.Length);
}
private string GetRequestUrl()
{
if (method != "GET" || customParameters.Count == 0)
return url;
return string.Format("{0}?{1}", url, GetCustomParametersString());
}
private string GetCustomParametersString()
{
return customParameters.Select(x => string.Format("{0}={1}", x.Key, x.Value)).Join("&");
}
private string GenerateAuthorizationHeaderValue(IEnumerable<KeyValuePair<string, string>> parameters, string signature)
{
return new StringBuilder("OAuth ")
.Append(parameters.Concat(new KeyValuePair<string, string>("oauth_signature", signature))
.Where(x => x.Key.StartsWith("oauth_"))
.Select(x => string.Format("{0}=\"{1}\"", x.Key, x.Value.EncodeRFC3986()))
.Join(","))
.ToString();
}
private string GenerateSignature(IEnumerable<KeyValuePair<string, string>> parameters)
{
var dataToSign = new StringBuilder()
.Append(method).Append("&")
.Append(url.EncodeRFC3986()).Append("&")
.Append(parameters
.OrderBy(x => x.Key)
.Select(x => string.Format("{0}={1}", x.Key, x.Value))
.Join("&")
.EncodeRFC3986());
var signatureKey = string.Format("{0}&{1}", oauth.ConsumerSecret.EncodeRFC3986(), oauth.AccessSecret.EncodeRFC3986());
var sha1 = new HMACSHA1(Encoding.ASCII.GetBytes(signatureKey));
var signatureBytes = sha1.ComputeHash(Encoding.ASCII.GetBytes(dataToSign.ToString()));
return Convert.ToBase64String(signatureBytes);
}
private void AddOAuthParameters(IDictionary<string, string> parameters, string timestamp, string nonce)
{
parameters.Add("oauth_version", VERSION);
parameters.Add("oauth_consumer_key", oauth.ConsumerKey);
parameters.Add("oauth_nonce", nonce);
parameters.Add("oauth_signature_method", SIGNATURE_METHOD);
parameters.Add("oauth_timestamp", timestamp);
parameters.Add("oauth_token", oauth.AccessToken);
}
private static string GetTimestamp()
{
return ((int)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds).ToString();
}
private static string CreateNonce()
{
return new Random().Next(0x0000000, 0x7fffffff).ToString("X8");
}
}
#endregion
}
public static class TinyTwitterHelperExtensions
{
public static string Join<T>(this IEnumerable<T> items, string separator)
{
return string.Join(separator, items.ToArray());
}
public static IEnumerable<T> Concat<T>(this IEnumerable<T> items, T value)
{
return items.Concat(new[] { value });
}
public static string EncodeRFC3986(this string value)
{
// From Twitterizer http://www.twitterizer.net/
if (string.IsNullOrEmpty(value))
return string.Empty;
var encoded = Uri.EscapeDataString(value);
return Regex
.Replace(encoded, "(%[0-9a-f][0-9a-f])", c => c.Value.ToUpper())
.Replace("(", "%28")
.Replace(")", "%29")
.Replace("$", "%24")
.Replace("!", "%21")
.Replace("*", "%2A")
.Replace("'", "%27")
.Replace("%7E", "~");
}
}
}