自动刷新人人网API session_key方法

      上个月做了一个关于人人网api数据的小东西。发现人人网的api做的不是一般的烂啊，前几天又看了一下，似乎更新了文档，又开放了些接口。现在就说一个在其中遇到的问题和大家分享一下。

问题是，在取用户数据的时候要求传一个session_key，这个session_key是根据access_token的值得到的，而且有过期时间。（具体方法点这里）。

access_token格式是这样的：

{ 

 "access_token": "127089|5.a24b8385f555445d3898cae50b65f3ef.86400.1295031600-222209506",

 "expires_in": 88913//过期时间

}
      根据人人网OAuth2.0的要求是，必须通过access_token才能得到session_key，但在实际应用过程中发现access_token中红色的部分就是session_key。那事情就简单了。
解决问题的方法是我们只要模拟人人网的登录就能够得到传说中新的session_key了。

先通过Firebug检测一下这个登录过程如下图：

 

Fiddler：

POST的表单内容：

整个过程经历了1次POST和3次GET的webrequest，所以我们只要模拟这些操作就可以刷新我们的session_key了。据体的方法在下面，自己应该能看懂。

  
  

   
    1 
   
    
   
   ///
   
    
   
   <summary>
   
   

   
    2 
   
    
   
   ///
   
    刷新access_token

   
    3 
   
    
   
   ///
   
    
   
   </summary>
   
   

   
    4 
   
    
   
   ///
   
    
   
   <returns></returns>
   
   

   
    5 
   
   
   
    
   
   public
   
    
   
   static
   
    
   
   string
   
    RefreshToken()

   
    6 
   
    {

   
    7 
   
    HttpWebRequest httpRequest 
   
   =
   
    
   
   null
   
   ;

   
    8 
   
    HttpWebResponse httpResponse 
   
   =
   
    
   
   null
   
   ;

   
    9 
   
    
   
   string
   
    gethost 
   
   =
   
    
   
   string
   
   .Empty;

   
    10 
   
    
   
   string
   
    Cookiesstr 
   
   =
   
    
   
   string
   
   .Empty;

   
    11 
   
    CookieContainer cookie 
   
   =
   
    
   
   new
   
    CookieContainer();

   
    12 
   
   

   
    13 
   
    
   
   //
   
   第一次POST
   
   

   
    14 
   
   
   
    
   
   try
   
   

   
    15 
   
    {

   
    16 
   
    
   
   byte
   
   [] data 
   
   =
   
    Encoding.UTF8.GetBytes(
   
   "
   
   email={你的邮箱}&password={你的密码}&domain=renren.com&origURL=http%3A%2F%2Fgraph.renren.com%2Foauth%2Fauthorize%3Fclient_id%3Dd743d5f993e34a30ac933d972b1e88df%26response_type%3Dtoken%26redirect_uri%3Dhttp%3A%2F%2Fgraph.renren.com%2Foauth%2Flogin_success.html%26pp%3D1%26https%3Dhttps%3A%2F%2Fgraph.renren.com
   
   "
   
   );

   
    17 
   
   

   
    18 
   
    Uri code 
   
   =
   
    
   
   new
   
    Uri(
   
   "
   
   http://passport.renren.com/RL.do?P3P=1
   
   "
   
   );

   
    19 
   
   

   
    20 
   
    httpRequest 
   
   =
   
    (HttpWebRequest)WebRequest.Create(code);

   
    21 
   
    httpRequest.Method 
   
   =
   
    
   
   "
   
   POST
   
   "
   
   ;

   
    22 
   
    httpRequest.ContentType 
   
   =
   
    
   
   "
   
   application/x-www-form-urlencoded
   
   "
   
   ;

   
    23 
   
    httpRequest.ContentLength 
   
   =
   
    data.Length;

   
    24 
   
    httpRequest.KeepAlive 
   
   =
   
    
   
   true
   
   ;

   
    25 
   
    httpRequest.AllowAutoRedirect 
   
   =
   
    
   
   false
   
   ;

   
    26 
   
    httpRequest.CookieContainer 
   
   =
   
    cookie;

   
    27 
   
    
   
   using
   
    (Stream newStream 
   
   =
   
    httpRequest.GetRequestStream())

   
    28 
   
    newStream.Write(data, 
   
   0
   
   , data.Length);

   
    29 
   
   

   
    30 
   
    httpResponse 
   
   =
   
    (HttpWebResponse)httpRequest.GetResponse();

   
    31 
   
    httpResponse.Cookies 
   
   =
   
    httpRequest.CookieContainer.GetCookies(httpRequest.RequestUri);

   
    32 
   
    CookieCollection cook 
   
   =
   
    httpResponse.Cookies;

   
    33 
   
    Cookiesstr 
   
   =
   
    httpRequest.CookieContainer.GetCookieHeader(httpRequest.RequestUri);

   
    34 
   
   

   
    35 
   
    
   
   string
   
    backstr 
   
   =
   
    
   
   string
   
   .Empty;

   
    36 
   
    
   
   using
   
    (StreamReader sr 
   
   =
   
    
   
   new
   
    StreamReader(httpResponse.GetResponseStream(), System.Text.Encoding.UTF8))

   
    37 
   
    backstr 
   
   =
   
    sr.ReadToEnd();

   
    38 
   
    
   
   string
   
   [] substr 
   
   =
   
    backstr.Split(
   
   new
   
    
   
   char
   
   [] { 
   
   '
   
   "
   
   '
   
    });

   
    39 
   
    gethost 
   
   =
   
    substr[
   
   1
   
   ];

   
    40 
   
   

   
    41 
   
    httpRequest.Abort();

   
    42 
   
    httpResponse.Close();

   
    43 
   
    }

   
    44 
   
    
   
   catch
   
    (Exception)

   
    45 
   
    { }

   
    46 
   
   

   
    47 
   
    
   
   //
   
   第一次GET
   
   

   
    48 
   
   
   
   

   
    49 
   
    
   
   try
   
   

   
    50 
   
    {

   
    51 
   
    
   
   string
   
    ss;

   
    52 
   
    httpRequest 
   
   =
   
    (HttpWebRequest)WebRequest.Create(gethost);

   
    53 
   
    httpRequest.Method 
   
   =
   
    
   
   "
   
   GET
   
   "
   
   ;

   
    54 
   
    httpRequest.KeepAlive 
   
   =
   
    
   
   true
   
   ;

   
    55 
   
    httpRequest.Headers.Add(
   
   "
   
   Cookie:
   
   "
   
    
   
   +
   
    Cookiesstr);

   
    56 
   
    httpRequest.CookieContainer 
   
   =
   
    cookie;

   
    57 
   
    httpRequest.AllowAutoRedirect 
   
   =
   
    
   
   false
   
   ;

   
    58 
   
    httpResponse 
   
   =
   
    (HttpWebResponse)httpRequest.GetResponse();

   
    59 
   
    Cookiesstr 
   
   =
   
    httpRequest.CookieContainer.GetCookieHeader(httpRequest.RequestUri);

   
    60 
   
    
   
   using
   
    (StreamReader sr 
   
   =
   
    
   
   new
   
    StreamReader(httpResponse.GetResponseStream(), Encoding.UTF8))

   
    61 
   
    ss 
   
   =
   
    sr.ReadToEnd();

   
    62 
   
    
   
   string
   
   [] substr 
   
   =
   
    ss.Split(
   
   new
   
    
   
   char
   
   [] { 
   
   '
   
   "
   
   '
   
    });

   
    63 
   
    gethost 
   
   =
   
    substr[
   
   1
   
   ];

   
    64 
   
    httpRequest.Abort();

   
    65 
   
    httpResponse.Close();

   
    66 
   
    }

   
    67 
   
    
   
   catch
   
    (Exception)

   
    68 
   
    { }

   
    69 
   
   

   
    70 
   
    
   
   //
   
   第二次GET
   
   

   
    71 
   
   
   
    
   
   try
   
   

   
    72 
   
    {

   
    73 
   
    
   
   string
   
    ss;

   
    74 
   
    httpRequest 
   
   =
   
    (HttpWebRequest)WebRequest.Create(gethost);

   
    75 
   
    httpRequest.Method 
   
   =
   
    
   
   "
   
   GET
   
   "
   
   ;

   
    76 
   
    httpRequest.KeepAlive 
   
   =
   
    
   
   true
   
   ;

   
    77 
   
    httpRequest.Headers.Add(
   
   "
   
   Cookie:
   
   "
   
    
   
   +
   
    Cookiesstr);

   
    78 
   
    httpRequest.CookieContainer 
   
   =
   
    cookie;

   
    79 
   
    httpRequest.AllowAutoRedirect 
   
   =
   
    
   
   false
   
   ;

   
    80 
   
    httpResponse 
   
   =
   
    (HttpWebResponse)httpRequest.GetResponse();

   
    81 
   
    Cookiesstr 
   
   =
   
    httpRequest.CookieContainer.GetCookieHeader(httpRequest.RequestUri);

   
    82 
   
    
   
   using
   
    (StreamReader sr 
   
   =
   
    
   
   new
   
    StreamReader(httpResponse.GetResponseStream(), Encoding.UTF8))

   
    83 
   
    ss 
   
   =
   
    sr.ReadToEnd();

   
    84 
   
    
   
   string
   
   [] substr 
   
   =
   
    ss.Split(
   
   new
   
    
   
   char
   
   [] { 
   
   '
   
   "
   
   '
   
    });

   
    85 
   
    gethost 
   
   =
   
    substr[
   
   1
   
   ];

   
    86 
   
    httpRequest.Abort();

   
    87 
   
    httpResponse.Close();

   
    88 
   
    }

   
    89 
   
    
   
   catch
   
    (Exception)

   
    90 
   
    { }

   
    91 
   
   

   
    92 
   
    
   
   //
   
   第三次GET
   
   

   
    93 
   
   
   
    
   
   try
   
   

   
    94 
   
    {

   
    95 
   
    
   
   string
   
    ss;

   
    96 
   
    httpRequest 
   
   =
   
    (HttpWebRequest)WebRequest.Create(gethost);

   
    97 
   
    httpRequest.Method 
   
   =
   
    
   
   "
   
   GET
   
   "
   
   ;

   
    98 
   
    httpRequest.KeepAlive 
   
   =
   
    
   
   true
   
   ;

   
    99 
   
    httpRequest.Headers.Add(
   
   "
   
   Cookie:
   
   "
   
    
   
   +
   
    Cookiesstr);

   
   100 
   
    httpRequest.CookieContainer 
   
   =
   
    cookie;

   
   101 
   
    httpRequest.AllowAutoRedirect 
   
   =
   
    
   
   false
   
   ;

   
   102 
   
    httpResponse 
   
   =
   
    (HttpWebResponse)httpRequest.GetResponse();

   
   103 
   
    Cookiesstr 
   
   =
   
    httpRequest.CookieContainer.GetCookieHeader(httpRequest.RequestUri);

   
   104 
   
    
   
   using
   
    (StreamReader sr 
   
   =
   
    
   
   new
   
    StreamReader(httpResponse.GetResponseStream(), Encoding.UTF8))

   
   105 
   
    ss 
   
   =
   
    sr.ReadToEnd();

   
   106 
   
    
   
   string
   
   [] substr 
   
   =
   
    ss.Split(
   
   new
   
    
   
   char
   
   [] { 
   
   '
   
   "
   
   '
   
    });

   
   107 
   
    gethost 
   
   =
   
    substr[
   
   1
   
   ];

   
   108 
   
    httpRequest.Abort();

   
   109 
   
    httpResponse.Close();

   
   110 
   
    }

   
   111 
   
    
   
   catch
   
    (Exception)

   
   112 
   
    { }

   
   113 
   
   

   
   114 
   
    
   
   return
   
    gethost.Substring(
   
   71
   
   , 
   
   61
   
   );

   
   115 
   
    }
  
  

     希望对大家有所帮助。