我正在尝试使用CTP通过OAuth 2.0与Facebook连接。
我可以得到Facebook的初始请求正常工作，但是当它回来时我们打电话：
// Where null will become an HttpRequestInfo object
client.ProcessUserAuthorization(null);
我明白了：
远程服务器返回错误：（400）错误请求。
我对初始代码库没有太多帮助;只是将可选值设置为null（我们仍然在.NET 3.5上）。任何线索都会非常感激。
另外，我想这对安德鲁来说更具问题;是否存在任何此类内容的论坛/博客，或者定期更新的任何地方？知道一些事情会很棒：
无论如何，任何建议都会受到欢迎。
答案 0 :(得分：22)
在遇到此问题后，我编写了自己的代码进行授权，并获取用户详细信息。另一种方法是使用Facebook C# SDK。作为其他任何想要自己做的人的首发，我就是这样做的。请注意我没有查看错误案例。
首先，read facebooks doc关于它是如何工作的（它相当简单！）
我这样消耗它：
private static readonly FacebookClient facebookClient = new FacebookClient();
public ActionResult LoginWithFacebook()
{
var result = facebookClient.Authorize();
if (result == FacebookAuthorisationResult.RequestingCode)
{
//The client will have already done a Response.Redirect
return View();
} else if (result == FacebookAuthorisationResult.Authorized)
{
var user = facebookClient.GetCurrentUser();
}
return Redirect("/");
}
客户端代码：
using System;
using System.IO;
using System.Net;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.Text;
using System.Web;
namespace Web.Services
{
public enum FacebookAuthorisationResult
{
Denied,
Authorized,
RequestingCode
}
public class FacebookClient
{
private const String SESSION_NAME_TOKEN = "UserFacebookToken";
public FacebookClient()
{
TokenEndpoint = new Uri("https://graph.facebook.com/oauth/access_token");
AuthorizationEndpoint = new Uri("https://graph.facebook.com/oauth/authorize");
MeGraphEndpoint = new Uri("https://graph.facebook.com/me");
ClientIdentifier = "xxxxxxxxxxxxxxxxxx";
Secret = "xxxxxxxxxxxx";
LocalSubDomain = "local.xxxxxxx.com";
}
public Uri TokenEndpoint { get; set; }
public Uri AuthorizationEndpoint { get; set; }
public Uri MeGraphEndpoint { get; set; }
public String Secret { get; set; }
public String ClientIdentifier { get; set; }
private String LocalSubDomain { get; set; }
public FacebookAuthorisationResult Authorize()
{
var errorReason = HttpContext.Current.Request.Params["error_reason"];
var userDenied = errorReason != null;
if (userDenied)
return FacebookAuthorisationResult.Denied;
var verificationCode = HttpContext.Current.Request.Params["code"];
var redirectUrl = GetResponseUrl(HttpContext.Current.Request.Url);
var needToGetVerificationCode = verificationCode == null;
if (needToGetVerificationCode)
{
var url = AuthorizationEndpoint + "?" +
"client_id=" + ClientIdentifier + "&" +
"redirect_uri=" + redirectUrl;
HttpContext.Current.Response.Redirect(url);
return FacebookAuthorisationResult.RequestingCode;
}
var token = ExchangeCodeForToken(verificationCode, redirectUrl);
HttpContext.Current.Session[SESSION_NAME_TOKEN] = token;
return FacebookAuthorisationResult.Authorized;
}
public Boolean IsCurrentUserAuthorized()
{
return HttpContext.Current.Session[SESSION_NAME_TOKEN] != null;
}
public FacebookGraph GetCurrentUser()
{
var token = HttpContext.Current.Session[SESSION_NAME_TOKEN];
if (token == null)
return null;
var url = MeGraphEndpoint + "?" +
"access_token=" + token;
var request = WebRequest.CreateDefault(new Uri(url));
using (var response = request.GetResponse())
{
using (var responseStream = response.GetResponseStream())
{
using (var responseReader = new StreamReader(responseStream))
{
var responseText = responseReader.ReadToEnd();
var user = FacebookGraph.Deserialize(responseText);
return user;
}
}
}
}
private String ExchangeCodeForToken(String code, Uri redirectUrl)
{
var url = TokenEndpoint + "?" +
"client_id=" + ClientIdentifier + "&" +
"redirect_uri=" + redirectUrl + "&" +
"client_secret=" + Secret + "&" +
"code=" + code;
var request = WebRequest.CreateDefault(new Uri(url));
using (var response = request.GetResponse())
{
using (var responseStream = response.GetResponseStream())
{
using (var responseReader = new StreamReader(responseStream))
{
var responseText = responseReader.ReadToEnd();
var token = responseText.Replace("access_token=", "");
return token;
}
}
}
}
private Uri GetResponseUrl(Uri url)
{
var urlAsString = url.ToString();
var doesUrlContainQuestionMark = urlAsString.Contains("?");
if (doesUrlContainQuestionMark)
{
// Remove any parameters. Apparently Facebook does not support state: http://forum.developers.facebook.net/viewtopic.php?pid=255231
// If you do not do this, you will get 'Error validating verification code'
urlAsString = urlAsString.Substring(0, urlAsString.IndexOf("?"));
}
var replaceLocalhostWithSubdomain = url.Host == "localhost";
if (!replaceLocalhostWithSubdomain)
return new Uri(urlAsString);
// Facebook does not like localhost, you can only use the configured url. To get around this, log into facebook
// and set your Site Domain setting, ie happycow.com.
// Next edit C:\Windows\System32\drivers\etc\hosts, adding the line:
// 127.0.0.1 local.happycow.cow
// And lastly, set LocalSubDomain to local.happycow.cow
urlAsString = urlAsString.Replace("localhost", LocalSubDomain);
return new Uri(urlAsString);
}
}
[DataContract]
public class FacebookGraph
{
private static DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(FacebookGraph));
// Note: Changed from int32 to string based on Antonin Jelinek advise of an overflow
[DataMember(Name = "id")]
public string Id { get; set; }
[DataMember(Name = "name")]
public string Name { get; set; }
[DataMember(Name = "first_name")]
public string FirstName { get; set; }
[DataMember(Name = "last_name")]
public string LastName { get; set; }
[DataMember(Name = "link")]
public Uri Link { get; set; }
[DataMember(Name = "birthday")]
public string Birthday { get; set; }
public static FacebookGraph Deserialize(string json)
{
if (String.IsNullOrEmpty(json))
{
throw new ArgumentNullException("json");
}
return Deserialize(new MemoryStream(Encoding.UTF8.GetBytes(json)));
}
public static FacebookGraph Deserialize(Stream jsonStream)
{
if (jsonStream == null)
{
throw new ArgumentNullException("jsonStream");
}
return (FacebookGraph)jsonSerializer.ReadObject(jsonStream);
}
}
}
答案 1 :(得分：1)
Iain的解决方案终于让我的工作变得有效了。
未来的实施者有一个注意事项 - 似乎Facebook ID属性现在超过了Int32类型的容量。你可能需要在FacebookGraph类中更改它，我使用了纯字符串。
谢谢Iain，你的代码真的帮助了我！
答案 2 :(得分：0)
我发现编写自己的实现比使用DNOA更省时。这并不是很困难，虽然我还没有真正对代码进行彻底的安全检查;我想这将是一个重要的警告。
这可能没那么有用，但我发现只需要每天花一半时间就可以开始工作。
答案 3 :(得分：0)
在搞乱了DotNetOpenAuth的升级并且没有遇到任何连接到Facebook的运气之后，我也将一些代码放在一起以支持从我的ASP.NET MVC应用程序中登录Facebook。
首先，这样的代码应该放在控制器的某个地方。
// You call this action to initiate the process with Facebook
public ActionResult FacebookLogIn()
{
return CreateFacebookClient().RequestAuthorisation();
}
// Facebook will call you back here
public ActionResult FacebookAuthorisationResponse()
{
var facebookClient = CreateFacebookClient();
var authorisationResponse = facebookClient.HandleAuthorisationResponse();
if (authorisationResponse.IsSuccess)
{
var accessToken = authorisationResponse.AccessToken;
// TODO do whatever you want to do with your access token here
return Redirect("SomeUrl");
}
// TODO handle the error somehow
return Content(authorisationResponse.ErrorMessage);
}
private FacebookClient CreateFacebookClient()
{
const string clientId = "xxxxxxxxxxxxxxx";
const string appSecret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
var redirectUrl = Url.Action("FacebookAuthorisationResponse", null, null, "http");
return new FacebookClient(clientId, appSecret, redirectUrl);
}
这几乎就是你需要对代码做的所有事情。获得该访问令牌后，您可以执行以下操作：
// Get basic information for this user
var basicInfoUrl = string.Format("https://graph.facebook.com/me?access_token={0}", Uri.EscapeDataString(accessToken.TokenString));
var json = new WebClient().DownloadString(basicInfoUrl);
支持上述相对简单的内容的代码就在这里。您可以将所有这些转储到项目的文件中：
// Drew Noakes, http://drewnoakes.com
// Created 08/08/2012 22:41
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
namespace DrewNoakes.Facebook.Mvc
{
public sealed class FacebookClient
{
private readonly string _clientId;
private readonly string _appSecret;
private readonly string _authorisationResponseUrl;
public IFacebookClientStateManager StateManager { get; set; }
public FacebookClient(string clientId, string appSecret, string authorisationResponseUrl)
{
_clientId = clientId;
_appSecret = appSecret;
_authorisationResponseUrl = authorisationResponseUrl;
StateManager = MemoryStateManager.Instance;
}
public ActionResult RequestAuthorisation(string[] permissions = null)
{
// First step is to redirect the visitor's browser to Facebook
var state = StateManager.GetState();
var url = string.Format("https://www.facebook.com/dialog/oauth?client_id={0}&redirect_uri={1}&scope={2}&state={3}",
_clientId, Uri.EscapeDataString(_authorisationResponseUrl), permissions == null ? string.Empty : string.Join(",", permissions), state);
return new RedirectResult(url, permanent: false);
}
public AuthorisationResponse HandleAuthorisationResponse()
{
var queryString = HttpContext.Current.Request.QueryString;
// Ensure returned state is expected
if (!StateManager.IsValidState(queryString["state"]))
return AuthorisationResponse.Error("Invalid state");
// TODO handle case where user declined: YOUR_REDIRECT_URI?error_reason=user_denied&error=access_denied&error_description=The+user+denied+your+request.&state=YOUR_STATE_VALUE
var code = queryString["code"];
var url = string.Format("https://graph.facebook.com/oauth/access_token?client_id={0}&redirect_uri={1}&code={3}&client_secret={2}",
_clientId, Uri.EscapeDataString(_authorisationResponseUrl), _appSecret, Uri.EscapeDataString(code));
var client = new WebClient { Proxy = null };
var responseBody = client.DownloadString(url);
// HTTP 200: access_token=USER_ACCESS_TOKEN&expires=NUMBER_OF_SECONDS_UNTIL_TOKEN_EXPIRES
// HTTP 400: TODO handle JSON error reponse: { "error": { "type": "OAuthException", "message": "Error validating verification code." } }
var response = HttpUtility.ParseQueryString(responseBody);
var accessToken = response["access_token"];
var expiresSecondsString = response["expires"];
int expiresSeconds;
if (!int.TryParse(expiresSecondsString, out expiresSeconds))
return AuthorisationResponse.Error("Unable to parse expiration time");
var expiresAtUtc = DateTime.UtcNow.AddSeconds(expiresSeconds);
return AuthorisationResponse.Success(accessToken, expiresAtUtc);
}
}
public class AuthorisationResponse
{
public bool IsSuccess { get; private set; }
public AccessToken AccessToken { get; private set; }
public string ErrorMessage { get; private set; }
private AuthorisationResponse() { }
public static AuthorisationResponse Error(string errorMessage)
{
return new AuthorisationResponse { IsSuccess = false, ErrorMessage = errorMessage };
}
public static AuthorisationResponse Success(string accessToken, DateTime expiresAtUtc)
{
return new AuthorisationResponse { IsSuccess = true, AccessToken = new AccessToken(accessToken, expiresAtUtc) };
}
}
public struct AccessToken
{
public string TokenString { get; private set; }
public DateTime ExpiresAtUtc { get; private set; }
public AccessToken(string tokenString, DateTime expiresAtUtc)
: this()
{
if (tokenString == null)
throw new ArgumentNullException("tokenString");
TokenString = tokenString;
ExpiresAtUtc = expiresAtUtc;
}
}
public interface IFacebookClientStateManager
{
string GetState();
bool IsValidState(string state);
}
/// <summary>
/// The default implementation of <see cref="IFacebookClientStateManager"/>.
/// </summary>
public sealed class MemoryStateManager : IFacebookClientStateManager
{
private static readonly IFacebookClientStateManager _instance = new MemoryStateManager();
public static IFacebookClientStateManager Instance
{
get { return _instance; }
}
private readonly Dictionary<string, DateTime> _stateTimes = new Dictionary<string, DateTime>();
public string GetState()
{
var state = Guid.NewGuid().ToString("N");
_stateTimes[state] = DateTime.UtcNow;
return state;
}
public bool IsValidState(string state)
{
var isValid = _stateTimes.Remove(state);
// Remove any keys that have not been accessed within a given period
var staleKeys = _stateTimes.Where(pair => pair.Value < DateTime.UtcNow.AddMinutes(-30)).Select(pair => pair.Key).ToList();
foreach (var staleKey in staleKeys)
_stateTimes.Remove(staleKey);
return isValid;
}
}
}
我今晚很快把它扔到了一起，但是如果我发现问题，我会稍后再回来补丁。它现在在我的网站上运行得非常好。
有一些TODO与强大的错误响应处理相关。
答案 4 :(得分：0)
当我使用returnTo的{{1}}的{{1}}参数时，我一直在间歇性地遇到同样的问题。只有某些WebServerClient URI会遇到问题...我传入的URI有一个Base64组件。其中一些在其中包含=。如果我对这些URL进行URL编码，我会从本地服务器收到“从客户端检测到潜在危险的Request.Path值（％）”错误。
直到我找到一个更好的解决方案，我才会在传递它之前对字符串进行一些刺激;
PrepareRequestUserAuthorization()然后，当我收到我的回复时，我执行相反的操作;
returnTo这不漂亮。但它确实解决了我遇到的直接（类似）问题。