5xdQfCCW

1public string signedSignature(string status, string postBody, string oauth_consumer_key, string oauth_nonce, string oauth_signature_method,
2                                    string oauth_token, string callbackURL, string oauth_timestamp, string oauth_version)
3    {            
4
5        //GS - When building the signature string the params
6        //must be in alphabetical order. I can't be bothered
7        //with that, get SortedDictionary to do it's thing
8        SortedDictionary<string, string> sd =
9            new SortedDictionary<string, string>();
10
11        //sd.Add("status", status);
12        sd.Add("include_entities", "true");
13        sd.Add("oauth_consumer_key", oauth_consumer_key);
14        sd.Add("oauth_nonce", oauth_nonce);
15        sd.Add("oauth_signature_method", oauth_signature_method);
16        sd.Add("oauth_timestamp", oauth_timestamp);
17        sd.Add("oauth_token", oauth_token);
18        sd.Add("oauth_version", oauth_version);
19
20        //GS - Build the signature string
21        string baseString = String.Empty;
22        baseString += "POST" + "&";
23        baseString += Uri.EscapeDataString(
24            "https://api.twitter.com/oauth/request_token")
25            + "&";
26
27        foreach (KeyValuePair<string, string> entry in sd)
28        {
29            baseString += Uri.EscapeDataString(entry.Key +
30                "=" + entry.Value + "&");
31        }
32
33        //GS - Remove the trailing ambersand char, remember 
34        //it's been urlEncoded so you have to remove the 
35        //last 3 chars - %26
36        baseString =
37            baseString.Substring(0, baseString.Length - 3);
38
39        //GS - Build the signing key
40        string consumerSecret =
41            "<consumer Secret>";
42
43        string oauth_token_secret =
44            "<token secret>";
45
46        string signingKey =
47            Uri.EscapeDataString(consumerSecret) + "&" +
48            Uri.EscapeDataString(oauth_token_secret);
49
50        //GS - Sign the request
51        HMACSHA1 hasher = new HMACSHA1(
52            new ASCIIEncoding().GetBytes(signingKey));
53
54        string signatureString = Convert.ToBase64String(
55            hasher.ComputeHash(
56            new ASCIIEncoding().GetBytes(baseString)));
57
58        return signatureString;
59    }
60
61public ActionResult AccessToken()
62    {            
63        //GS - Get the oAuth params
64        string status = "Hello Ladies + Gentlemen, a signed OAuth request!";
65        string postBody = "status=" +
66            Uri.EscapeDataString(status);
67
68        string oauth_consumer_key = "bidjtABOkF0b3mvw1UaHWDf7x";
69        string oauth_nonce = Convert.ToBase64String(
70            new ASCIIEncoding().GetBytes(
71                DateTime.Now.Ticks.ToString()));
72
73        string oauth_signature_method = "HMAC-SHA1";
74        string oauth_token =
75            "84473240-brz5BNw9r2WfbufzJ2WjaLysCBHmJjhjJxMVGz8Od";
76
77        string callbackURL = Uri.EscapeDataString("http://localhost:37808/");
78
79        TimeSpan ts = DateTime.UtcNow -
80            new DateTime(1970, 1, 1, 0, 0, 0, 0);
81
82        string oauth_timestamp =
83            Convert.ToInt64(ts.TotalSeconds).ToString();
84
85        string oauth_version = "1.0";
86
87        string sSig = signedSignature(status, postBody, oauth_consumer_key, oauth_nonce, oauth_signature_method, oauth_token, 
88                                    callbackURL, oauth_timestamp, oauth_version);
89
90        //GS - Tell Twitter we don't do the 100 continue thing
91        ServicePointManager.Expect100Continue = false;
92
93        //GS - Instantiate a web request and populate the 
94        //authorization header
95        HttpWebRequest hwr =
96            (HttpWebRequest)WebRequest.Create(
97            @"https://api.twitter.com/oauth/request_token");
98
99        string authorizationHeaderParams = String.Empty;
100        authorizationHeaderParams += "OAuth ";
101        authorizationHeaderParams += "oauth_nonce=" + """ +
102            Uri.EscapeDataString(oauth_nonce) + "",";
103
104        authorizationHeaderParams +=
105            "oauth_signature_method=" + """ +
106            Uri.EscapeDataString(oauth_signature_method) +
107            "",";
108        authorizationHeaderParams += "oauth_callback=" + """ +
109            callbackURL + "",";
110
111        authorizationHeaderParams += "oauth_timestamp=" + """ +
112            Uri.EscapeDataString(oauth_timestamp) + "",";
113
114        authorizationHeaderParams += "oauth_consumer_key="
115            + """ + Uri.EscapeDataString(
116            oauth_consumer_key) + "",";
117
118        authorizationHeaderParams += "oauth_signature=" + """
119            + Uri.EscapeDataString(sSig) + "",";
120
121        authorizationHeaderParams += "oauth_version=" + """ +
122            Uri.EscapeDataString(oauth_version) + """;
123
124        hwr.Headers.Add(
125            "Authorization", authorizationHeaderParams);
126
127        //GS - POST off the request
128        hwr.Method = "POST";
129        hwr.ContentType = "application/x-www-form-urlencoded";
130        Stream stream = hwr.GetRequestStream();
131        byte[] bodyBytes =
132            new ASCIIEncoding().GetBytes(postBody);
133
134        stream.Write(bodyBytes, 0, bodyBytes.Length);
135        stream.Flush();
136        stream.Close();
137
138        //GS - Allow us a reasonable timeout in case
139        //Twitter's busy
140        hwr.Timeout = 3 * 60 * 1000;
141
142        try
143        {
144                HttpWebResponse rsp = hwr.GetResponse()
145                    as HttpWebResponse;
146            rsp.StatusCode.ToString();
147                //GS - Do something with the return here...
148        }
149        catch (WebException e)
150        {
151            //GS - Do some clever error handling here...
152        }
153
154        return View();            
155    }