LinkedIn应用开发系列 ---- 获取Request token.doc

LinkedIn应用开发系列(二) - 获取Request token 上一章节大概总结整理了一下具体开发一个Linkedin应用的一些步骤。 这一章节主要是第一个步骤的获取Request token。 通过请求/uas/oauth/requestToken 获取request token。 然而，请求获取一个Request token必须以下要求及的带请求参数 HTTP Method (POST)-post方式提交申请 Request URI (/uas/oauth/requestToken)-请求地址 oauth_callback-验证成功后回调跳转的地址 oauth_consumer_key -你申请的API KEY oauth_nonce -随机数 oauth_signature_method -加密方式oauth_timestamp-时间截签名 oauth_version -版本号 oauth_signature -签名 同时，这一步也分为三个小步骤： 1. 创建POST请求 2. 根据请求创建签名 3 .获取request token 好了，我们先看看第一步的POST请求，而这个个POST请求，需要类似下面的格式:POST&https%3A%2F%2F%2Fuas%2Foauth%2FrequestToken&oauth_callback%3Dhttp%253A%252F%252F%26oauth_consumer_key%3D8R4adR12-cVx7ySHO4tS62zkzYaSHVxhV0XY6lpyjCQn9YjR-nGn1OOmqdNdka_k%26oauth_nonce%3D2063151%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1274640507%26oauth_version%3D1.0当这个请求成功后，Linkedin就会输出带参数的字符串(如下)， 那么oauth_token就是我们所需要的Request token了 oauth_token=e89ecb3f-1050-4062-be2d-446ee61d4c2e&oauth_token_secret=56db820b-6ffc-408f-81f7-6aee9f39b8cd&oauth_callback_confirmed=true&xoauth_request_auth_url=https%3A%2F%2F%2Fuas%2Foauth%2Fauthorize&oauth_expires_in=599那么，废话不多说，直接上代码，代码实在太长了，偶不想用太多文字去解释跟描述，代码就是最好的解释，开发人员最喜欢的就是代码了。如果太多文字的话，估计文字加代码的方式长长地拖下去让人看得晕晕的。里面都比较简单，下面的代码中，我们就可以得到了Request token了。 public string GenSignString(Uri url, string consumerKey, string token,string tokenSecret, string method, string callback, out string requestUrl,out string parameters) string nonce = random.Next(123400, 9999999).ToString(); TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0); string timeStamp = Convert.ToInt64(ts.TotalSeconds).ToString(); requestUrl = string.Format(0:/12, url.Scheme,url.Host, url.AbsolutePath); StringBuilder sb = new StringBuilder(); string requestparameters = oauth_callback=0&oauth_consumer_key=1&oauth_nonce=2 &oauth_signature_method=HMAC-SHA1&oauth_timestamp=3&oauth_version=1.0; sb.AppendFormat(requestparameters, UrlEncode(callback),consumerKey, nonce, timeStamp); parameters = sb.ToString(); sb = new StringBuilder(); sb.AppendFormat(0&, method.ToUpper(); sb.AppendFormat(0&, UrlEncode(requestUrl); sb.AppendFormat(0, UrlEncode(parameters); return sb.ToString(); public void GenSign(Uri url, string _key, string _secret, string token, string tokenSecret, string method, string callback, out string requestUrl, out string parameters) string sigstring = GenSignString(url, _key, token, tokenSecret, method, callback, out requestUrl, out parameters); HMACSHA1 ha = new HMACSHA1(); ha.Key = Encoding.ASCII.GetBytes(string.Format(0&1, UrlEncode(_secret), string.IsNullOrEmpty(tokenSecret) ? : UrlEncode(tokenSecret); byte _buffer = System.Text.Encoding.ASCII.GetBytes(sigstring); byte _bytes = ha.ComputeHash(_buffer); string sig = Convert.ToBase64String(_bytes); parameters = parameters + &oauth_signature= + HttpUtility.UrlEncode(sig);public string GetRequestToKen() string rquestUrl = string.Empty; string query = string.Empty;string callback = http:/localhost/linkedin/callback.aspx; string url = /uas/oauth/requestToken; Uri uri = new Uri(url); GenSign(uri, this.ConsumerKey, this.ConsumerSecret, string.Empty, string.Empty, POST, callback, out rquestUrl, out query); string response = WebRequest(POST, rquestUrl, query); NameValueCollection qs = HttpUtility.ParseQueryString(response); return qsoauth_token;public string WebRequest(string method, string url, string postData) HttpWebRequest webRequest = null; StreamWriter requestWriter = null; string response = string.Empty; webRequest = System.Net.WebRequest.Create(url) as HttpWebRequest; webRequest.Method = method; webRequest.ServicePoint.Expect100Continue = false; webRequest.Timeout = 10000; if (method.ToUpper() = POST) webRequest.ContentType = application/x-www-form-urlencoded; requestWriter = new StreamWriter(webRequest.GetRequestStream(); try requestWriter.Write(postData); catch throw; finally requestWriter.Close(); requestWriter = null; response