ASP.NET实现QQ、微信、新浪微博OAuth2.0授权登录的实例详解

不管是腾讯还是新浪，查看他们的API，PHP都是有完整的接口，但对C#支持似乎都不是那么完善，都没有，腾讯是完全没有，新浪是提供第三方的，而且后期还不一定升级，NND，用第三方的动辄就一个类库，各种配置还必须按照他们约定的写，烦而且乱，索性自己写，后期的扩展也容易，看过接口后，开始以为很难，参考了几个源码之后发现也不是那么难，无非是GET或POST请求他们的接口获取返回值之类的，话不多说，这里只提供几个代码共参考，抛砖引玉了。。。

我这个写法的特点是，用到了Session，使用对象实例化之后调用 Login() 跳转到登录页面，在回调页面调用Callback() 执行之后，可以从Session也可以写独立的函数（如：GetOpenID()）中获取access_token或用户的唯一标识，以方便做下一步的操作。所谓绑定就是把用户的唯一标识取出，插入数据库，和帐号绑定起来。

1.首先是所有OAuth类的基类，放一些需要公用的方法

public abstract class BaseOAuth  {    public HttpRequest Request = HttpContext.Current.Request;    public HttpResponse Response = HttpContext.Current.Response;    public HttpSessionState Session = HttpContext.Current.Session;    public abstract void Login();    public abstract string Callback();    #region 内部使用函数    /// <summary>    /// 生成唯一随机串防CSRF攻击    /// </summary>    /// <returns></returns>    protected string GetStateCode()    {      Random rand = new Random();      string data = DateTime.Now.ToString("yyyyMMddHHmmssffff") + rand.Next(1, 0xf423f).ToString();        MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();        byte[] md5byte = md5.ComputeHash(UTF8Encoding.Default.GetBytes(data));        return BitConverter.ToString(md5byte).Replace("-", "");      }      /// <summary>    /// GET请求    /// </summary>    /// <param name="url"></param>    /// <returns></returns>    protected string GetRequest(string url)    {      HttpWebRequest httpWebRequest = System.Net.WebRequest.Create(url) as HttpWebRequest;      httpWebRequest.Method = "GET";      httpWebRequest.ServicePoint.Expect100Continue = false;        StreamReader responseReader = null;      string responseData;      try      {        responseReader = new StreamReader(httpWebRequest.GetResponse().GetResponseStream());        responseData = responseReader.ReadToEnd();      }      finally      {        httpWebRequest.GetResponse().GetResponseStream().Close();        responseReader.Close();      }        return responseData;    }      /// <summary>    /// POST请求    /// </summary>    /// <param name="url"></param>    /// <param name="postData"></param>    /// <returns></returns>    protected string PostRequest(string url, string postData)    {      HttpWebRequest httpWebRequest = System.Net.WebRequest.Create(url) as HttpWebRequest;      httpWebRequest.Method = "POST";      httpWebRequest.ServicePoint.Expect100Continue = false;      httpWebRequest.ContentType = "application/x-www-form-urlencoded";        //写入POST参数      StreamWriter requestWriter = new StreamWriter(httpWebRequest.GetRequestStream());      try      {        requestWriter.Write(postData);      }      finally      {        requestWriter.Close();      }        //读取请求后的结果      StreamReader responseReader = null;      string responseData;      try      {        responseReader = new StreamReader(httpWebRequest.GetResponse().GetResponseStream());        responseData = responseReader.ReadToEnd();      }      finally      {        httpWebRequest.GetResponse().GetResponseStream().Close();        responseReader.Close();      }        return responseData;    }      /// <summary>    /// 解析JSON    /// </summary>    /// <param name="strJson"></param>    /// <returns></returns>    protected NameValueCollection ParseJson(string strJson)    {      NameValueCollection mc = new NameValueCollection();      Regex regex = new Regex(@"(\s*\""?([^""]*)\""?\s*\:\s*\""?([^""]*)\""?\,?)");      strJson = strJson.Trim();      if (strJson.StartsWith("{"))      {        strJson = strJson.Substring(1, strJson.Length - 2);      }        foreach (Match m in regex.Matches(strJson))      {        mc.Add(m.Groups[2].Value, m.Groups[3].Value);      }      return mc;    }      /// <summary>    /// 解析URL    /// </summary>    /// <param name="strParams"></param>    /// <returns></returns>    protected NameValueCollection ParseUrlParameters(string strParams)    {      NameValueCollection nc = new NameValueCollection();      foreach (string p in strParams.Split('&'))      {        string[] ps = p.Split('=');        nc.Add(ps[0], ps[1]);      }      return nc;    }      #endregion    }

2.QQ的OAuth类

public class QQOAuth : BaseOAuth  {    public string AppId = ConfigurationManager.AppSettings["OAuth_QQ_AppId"];    public string AppKey = ConfigurationManager.AppSettings["OAuth_QQ_AppKey"];    public string RedirectUrl = ConfigurationManager.AppSettings["OAuth_QQ_RedirectUrl"];      public const string GET_AUTH_CODE_URL = "https://graph.qq.com/oauth2.0/authorize";    public const string GET_ACCESS_TOKEN_URL = "https://graph.qq.com/oauth2.0/token";    public const string GET_OPENID_URL = "https://graph.qq.com/oauth2.0/me";      /// <summary>    /// QQ登录，跳转到登录页面    /// </summary>    public override void Login()    {      //-------生成唯一随机串防CSRF攻击      string state = GetStateCode();      Session["QC_State"] = state; //state 放入Session        string parms = "?response_type=code&"        + "client_id=" + AppId + "&redirect_uri=" + Uri.EscapeDataString(RedirectUrl) + "&state=" + state;        string url = GET_AUTH_CODE_URL + parms;      Response.Redirect(url); //跳转到登录页面    }      /// <summary>    /// QQ回调函数    /// </summary>    /// <param name="code"></param>    /// <param name="state"></param>    /// <returns></returns>    public override string Callback()    {      string code = Request.QueryString["code"];      string state = Request.QueryString["state"];        //--------验证state防止CSRF攻击      if (state != (string)Session["QC_State"])      {        ShowError("30001");      }        string parms = "?grant_type=authorization_code&"        + "client_id=" + AppId + "&redirect_uri=" + Uri.EscapeDataString(RedirectUrl)        + "&client_secret=" + AppKey + "&code=" + code;        string url = GET_ACCESS_TOKEN_URL + parms;      string str = GetRequest(url);        if (str.IndexOf("callback") != -1)      {        int lpos = str.IndexOf("(");        int rpos = str.IndexOf(")");        str = str.Substring(lpos + 1, rpos - lpos - 1);        NameValueCollection msg = ParseJson(str);        if (!string.IsNullOrEmpty(msg["error"]))        {          ShowError(msg["error"], msg["error_description"]);        }        }        NameValueCollection token = ParseUrlParameters(str);      Session["QC_AccessToken"] = token["access_token"]; //access_token 放入Session      return token["access_token"];    }        /// <summary>    /// 使用Access Token来获取用户的OpenID    /// </summary>    /// <param name="accessToken"></param>    /// <returns></returns>    public string GetOpenID()    {      string parms = "?access_token=" + Session["QC_AccessToken"];        string url = GET_OPENID_URL + parms;      string str = GetRequest(url);        if (str.IndexOf("callback") != -1)      {        int lpos = str.IndexOf("(");        int rpos = str.IndexOf(")");        str = str.Substring(lpos + 1, rpos - lpos - 1);      }        NameValueCollection user = ParseJson(str);        if (!string.IsNullOrEmpty(user["error"]))      {        ShowError(user["error"], user["error_description"]);      }        Session["QC_OpenId"] = user["openid"]; //openid 放入Session      return user["openid"];    }      /// <summary>    /// 显示错误信息    /// </summary>    /// <param name="code">错误编号</param>    /// <param name="description">错误描述</param>    private void ShowError(string code, string description = null)    {      if (description == null)      {        switch (code)        {          case "20001":            description = "<h2>配置文件损坏或无法读取，请检查web.config</h2>";            break;          case "30001":            description = "<h2>The state does not match. You may be a victim of CSRF.</h2>";            break;          case "50001":            description = "<h2>可能是服务器无法请求https协议</h2>可能未开启curl支持,请尝试开启curl支持，重启web服务器，如果问题仍未解决，请联系我们";            break;          default:            description = "<h2>系统未知错误，请联系我们</h2>";            break;        }        Response.Write(description);        Response.End();      }      else      {        Response.Write("<h3>error:<h3>" + code + "<h3>msg:<h3>" + description);        Response.End();      }    }    }

3.新浪微博的OAuth类

public class SinaOAuth : BaseOAuth  {    public string AppKey = ConfigurationManager.AppSettings["OAuth_Sina_AppKey"];    public string AppSecret = ConfigurationManager.AppSettings["OAuth_Sina_AppSecret"];    public string RedirectUrl = ConfigurationManager.AppSettings["OAuth_Sina_RedirectUrl"];      public const string GET_AUTH_CODE_URL = "https://api.weibo.com/oauth2/authorize";    public const string GET_ACCESS_TOKEN_URL = "https://api.weibo.com/oauth2/access_token";    public const string GET_UID_URL = "https://api.weibo.com/2/account/get_uid.json";      /// <summary>    /// 新浪微博登录，跳转到登录页面    /// </summary>    public override void Login()    {      //-------生成唯一随机串防CSRF攻击      string state = GetStateCode();      Session["Sina_State"] = state; //state 放入Session        string parms = "?client_id=" + AppKey + "&redirect_uri=" + Uri.EscapeDataString(RedirectUrl)        + "&state=" + state;        string url = GET_AUTH_CODE_URL + parms;      Response.Redirect(url); //跳转到登录页面    }      /// <summary>    /// 新浪微博回调函数    /// </summary>    /// <returns></returns>    public override string Callback()    {      string code = Request.QueryString["code"];      string state = Request.QueryString["state"];        //--------验证state防止CSRF攻击      if (state != (string)Session["Sina_State"])      {        ShowError("The state does not match. You may be a victim of CSRF.");      }        string parms = "client_id=" + AppKey + "&client_secret=" + AppSecret        + "&grant_type=authorization_code&code=" + code + "&redirect_uri=" + Uri.EscapeDataString(RedirectUrl);        string str = PostRequest(GET_ACCESS_TOKEN_URL, parms);        NameValueCollection user = ParseJson(str);        Session["Sina_AccessToken"] = user["access_token"]; //access_token 放入Session      Session["Sina_UId"] = user["uid"]; //uid 放入Session      return user["access_token"];    }        /// <summary>    /// 显示错误信息    /// </summary>    /// <param name="description">错误描述</param>    private void ShowError(string description = null)    {      Response.Write("<h2>" + description + "</h2>");      Response.End();    }  }

4.微信的OAuth类

public class WeixinOAuth : BaseOAuth  {    public string AppId = ConfigurationManager.AppSettings["OAuth_Weixin_AppId"];    public string AppSecret = ConfigurationManager.AppSettings["OAuth_Weixin_AppSecret"];    public string RedirectUrl = ConfigurationManager.AppSettings["OAuth_Weixin_RedirectUrl"];      public const string GET_AUTH_CODE_URL = "https://open.weixin.qq.com/connect/qrconnect";    public const string GET_ACCESS_TOKEN_URL = "https://api.weixin.qq.com/sns/oauth2/access_token";    public const string GET_USERINFO_URL = "https://api.weixin.qq.com/sns/userinfo";      /// <summary>    /// 微信登录，跳转到登录页面    /// </summary>    public override void Login()    {      //-------生成唯一随机串防CSRF攻击      string state = GetStateCode();      Session["Weixin_State"] = state; //state 放入Session        string parms = "?appid=" + AppId        + "&redirect_uri=" + Uri.EscapeDataString(RedirectUrl) + "&response_type=code&scope=snsapi_login"        + "&state=" + state + "#wechat_redirect";        string url = GET_AUTH_CODE_URL + parms;      Response.Redirect(url); //跳转到登录页面    }      /// <summary>    /// 微信回调函数    /// </summary>    /// <param name="code"></param>    /// <param name="state"></param>    /// <returns></returns>    public override string Callback()    {      string code = Request.QueryString["code"];      string state = Request.QueryString["state"];        //--------验证state防止CSRF攻击      if (state != (string)Session["Weixin_State"])      {        ShowError("30001");      }        string parms = "?appid=" + AppId + "&secret=" + AppSecret        + "&code=" + code + "&grant_type=authorization_code";        string url = GET_ACCESS_TOKEN_URL + parms;      string str = GetRequest(url);          NameValueCollection msg = ParseJson(str);      if (!string.IsNullOrEmpty(msg["errcode"]))      {        ShowError(msg["errcode"], msg["errmsg"]);      }        Session["Weixin_AccessToken"] = msg["access_token"]; //access_token 放入Session      Session["Weixin_OpenId"] = msg["openid"]; //access_token 放入Session      return msg["access_token"];    }        /// <summary>    /// 显示错误信息    /// </summary>    /// <param name="code">错误编号</param>    /// <param name="description">错误描述</param>    private void ShowError(string code, string description = null)    {      if (description == null)      {        switch (code)        {          case "20001":            description = "<h2>配置文件损坏或无法读取，请检查web.config</h2>";            break;          case "30001":            description = "<h2>The state does not match. You may be a victim of CSRF.</h2>";            break;          case "50001":            description = "<h2>接口未授权</h2>";            break;          default:            description = "<h2>系统未知错误，请联系我们</h2>";            break;        }        Response.Write(description);        Response.End();      }      else      {        Response.Write("<h3>error:<h3>" + code + "<h3>msg:<h3>" + description);        Response.End();      }    }    }

5.web.config配置信息

<appSettings>      <!--QQ登录相关配置-->      <add key="OAuth_QQ_AppId" value="123456789" />      <add key="OAuth_QQ_AppKey" value="25f9e794323b453885f5181f1b624d0b" />      <add key="OAuth_QQ_RedirectUrl" value="http://www.domain.com/oauth20/qqcallback.aspx" />        <!--新浪微博登录相关配置-->      <add key="OAuth_Sina_AppKey" value="123456789" />      <add key="OAuth_Sina_AppSecret" value="25f9e794323b453885f5181f1b624d0b" />      <add key="OAuth_Sina_RedirectUrl" value="http://www.domain.com/oauth20/sinacallback.aspx" />        <!--微信登录相关配置-->      <add key="OAuth_Weixin_AppId" value="wx123456789123" />      <add key="OAuth_Weixin_AppSecret" value="25f9e794323b453885f5181f1b624d0b" />      <add key="OAuth_Weixin_RedirectUrl" value="http://www.domain.com/oauth20/weixincallback.aspx" />  </appSettings>

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