MVC 5应用程序 – 实现OAuth授权代码流程

> http://brockallen.com/2013/10/24/a-primer-on-owin-cookie-authentication-middleware-for-the-asp-net-developer/
> http://brockallen.com/2014/01/09/a-primer-on-external-login-providers-social-logins-with-owinkatana-authentication-middleware/

基本思路是注册两个认证中间件.活动的Cookie验证和被动OAuthBearer-Authentication.在Startup.Auth.cs中,它们是这样添加的：

app.UseCookieAuthentication(new CookieAuthenticationOptions()
{
    AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,LoginPath = new PathString("/ExternalLogin/Login"),});
app.USEOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions()
{
    AuthenticationType = DefaultAuthenticationTypes.ExternalBearer,AuthenticationMode = Microsoft.Owin.Security.AuthenticationMode.Passive,});

您还可以添加一个ExternalLogin-Controller.其登录方法必须将用户重定向到授权服务器的登录页面以获取授权码.您必须提供一个回调函数,您将在其中处理授权码.

public async Task<ActionResult> Login(string returnUrl)
{
    if (string.IsNullOrEmpty(returnUrl) && Request.UrlReferrer != null)
        returnUrl = Server.UrlEncode(Request.UrlReferrer.PathAndQuery);

    if (Url.IsLocalUrl(returnUrl) && !string.IsNullOrEmpty(returnUrl))
        _returnUrl = returnUrl;

    //callback function
    _redirectUrl = Url.Action("AuthorizationCodeCallback","ExternalLogin",null,Request.Url.Scheme);

    Dictionary<string,string> authorizeArgs = null;
    authorizeArgs = new Dictionary<string,string>
    {
        {"client_id","0123456789"},{"response_type","code"},{"scope","read"},{"redirect_uri",_redirectUrl}
        // optional: state
    };

    var content = new FormUrlEncodedContent(authorizeArgs);
    var contentAsString = await content.ReadAsStringAsync();
    return Redirect("http://localhost:64426/oauth/authorize?" + contentAsString);
}

在您的回调功能中,交换访问令牌(加刷新令牌)的授权代码会挑战您的被动OAuthBearer身份验证中间件,并使用Access令牌作为Cookie登录.

public async Task<ActionResult> AuthorizationCodeCallback()
{
    // received authorization code from authorization server
    string[] codes = Request.Params.GetValues("code");
    var authorizationCode = "";
    if (codes.Length > 0)
        authorizationCode = codes[0];

    // exchange authorization code at authorization server for an access and refresh token
    Dictionary<string,string> post = null;
    post = new Dictionary<string,{"client_secret","ClientSecret"},{"grant_type","authorization_code"},{"code",authorizationCode},_redirectUrl}
    };

    var client = new HttpClient();
    var postContent = new FormUrlEncodedContent(post);
    var response = await client.PostAsync("http://localhost:64426/token",postContent);
    var content = await response.Content.ReadAsStringAsync();

    // received tokens from authorization server
    var json = JObject.Parse(content);
    _accessToken = json["access_token"].ToString();
    _authorizationScheme = json["token_type"].ToString();
    _expiresIn = json["expires_in"].ToString();
    if (json["refresh_token"] != null)
        _refreshToken = json["refresh_token"].ToString();

    //SignIn with Token,SignOut and create new identity for SignIn
    Request.Headers.Add("Authorization",_authorizationScheme + " " + _accessToken);
    var ctx = Request.GetOwinContext();
    var authenticateResult = await ctx.Authentication.AuthenticateAsync(DefaultAuthenticationTypes.ExternalBearer);
    ctx.Authentication.SignOut(DefaultAuthenticationTypes.ExternalBearer);
    var applicationCookieIdentity = new ClaimsIdentity(authenticateResult.Identity.Claims,DefaultAuthenticationTypes.ApplicationCookie);
    ctx.Authentication.SignIn(applicationCookieIdentity);

    var ctxUser = ctx.Authentication.User;
    var user = Request.RequestContext.HttpContext.User;

    //redirect back to the view which required authentication
    string decodedUrl = "";
    if (!string.IsNullOrEmpty(_returnUrl))
        decodedUrl = Server.UrlDecode(_returnUrl);

    if (Url.IsLocalUrl(decodedUrl))
        return Redirect(decodedUrl);
    else
        return RedirectToAction("Index","Home");
}

我希望这对于在他的MVC 5应用程序中实现OAuth授权代码流的人是有用的.