Возможно, я опоздал, но я столкнулся с этой проблемой несколько дней назад и нашел только несколько плохих решений в Интернете. Поэтому я написал свое собственное решение и могу опубликовать его только сейчас.
Я воспользовался классом DotNetOpenAuth.AspNet.Clients.OAuth2Client, который выполняет большую часть работы. Я только расширил это, включив область действия и дополнительные пользовательские данные.
public class FacebookExtendedClient : DotNetOpenAuth.AspNet.Clients.OAuth2Client
{
protected FacebookClient facebookClient;
protected string fields;
protected string scope;
protected Func<string, object, string> fieldTransformer;
protected bool emailAsUsername;
protected IDictionary<string, string> userData;
private string[] splittedFields;
private string[] splittedScope;
protected const string serviceLoginBaseUrl = "https://www.facebook.com/dialog/oauth";
protected const string serviceMeBaseUrl = "https://graph.facebook.com/me";
protected const string serviceAccessTokenBaseUrl = "https://graph.facebook.com/oauth/access_token";
/// <summary>
/// Create an instrance of the class.
/// </summary>
/// <param name="appId">The App ID of the application used to connect to Facebook service.</param>
/// <param name="appSecret">The App Secret of the application used to connect to Facebook service.</param>
/// <param name="fields">
/// String containing comma separated fields to add to the request.
/// If empty the request will retrieve the default fields based of the specified scope.
/// </param>
/// <param name="fieldTransformer">
/// Function to be applied to the values retrived from facebook.
/// If null provided the method will try to cast values from object to string explicitly,
/// an InvalidCastException will be thrown if the cast will not be possible.
/// </param>
/// <param name="scope">
/// String containing comma separated permissions to add to the request.
/// If empty the request will have the basic scope.
/// </param>
/// <param name="emailAsUsername">Makes the email of the facebook user used as authentication username.</param>
public FacebookExtendedClient(string appId, string appSecret, string fields = "", Func<string, object, string> fieldTransformer = null, string scope = "", bool emailAsUsername = false)
: base("facebook")
{
if (string.IsNullOrEmpty(appId))
throw new ArgumentException("The appId argument can not be null or empty.", "appId");
if (string.IsNullOrEmpty(appSecret))
throw new ArgumentException("The appSecret argument can not be null or empty.", "appSecret");
fields = fields.Replace(" ", "");
scope = scope.Replace(" ", "");
this.splittedFields = fields.Split(',');
this.splittedScope = scope.Split(',');
if (emailAsUsername == true && !this.splittedFields.Contains("email") && !this.splittedScope.Contains("email"))
throw new ArgumentException("The scope argument must contain the 'email' permission and the 'email' field to allow emailAsUsername to true.", "scope");
this.facebookClient = new FacebookClient();
this.facebookClient.AppId = appId;
this.facebookClient.AppSecret = appSecret;
this.fields = fields;
this.fieldTransformer = fieldTransformer;
this.scope = scope;
this.emailAsUsername = emailAsUsername;
}
public FacebookClient FacebookClient
{
get
{
return this.facebookClient;
}
}
public IDictionary<string, string> UserData
{
get
{
return this.userData;
}
}
protected override Uri GetServiceLoginUrl(Uri returnUrl)
{
Dictionary<string, object> parameters = new Dictionary<string, object>();
parameters.Add("redirect_uri", returnUrl.AbsoluteUri);
if (!string.IsNullOrEmpty(this.scope))
parameters.Add("scope", this.scope);
return this.facebookClient.GetLoginUrl(parameters);
}
protected override IDictionary<string, string> GetUserData(string accessToken)
{
// This method makes the AuthenticationResult's UserName property be the facebook username of the logged user,
// but if the facebook username is missing the facebook id will be used.
// If emailAsUsername is true then AuthenticationResult's UserName property is the email retrieved from facebook
// and the facebook username can be retrieved by the key "fb_username" in this.userData
FacebookClient facebookClient = new FacebookClient(accessToken);
var getResult = facebookClient.Get<IDictionary<string, object>>("me", new { fields = this.fields });
Dictionary<string, string> result = new Dictionary<string, string>();
if (this.fieldTransformer != null)
{
foreach (var pair in getResult)
result.Add(pair.Key, this.fieldTransformer(pair.Key, pair.Value));
}
else
{
foreach (var pair in getResult)
{
string value = pair.Value.ToString();
if (value == null)
throw new InvalidCastException("Cast not possible for the object associate to the key '" + pair.Key + "'.");
result.Add(pair.Key, value);
}
}
if (this.splittedFields.Contains("username"))
result["fb_username"] = result["username"];
if (this.emailAsUsername)
result["username"] = result["email"];
this.userData = result;
return result;
}
protected override string QueryAccessToken(Uri returnUrl, string authorizationCode)
{
UriBuilder builder = new UriBuilder(serviceAccessTokenBaseUrl);
builder.Query = string.Format("client_id={0}&client_secret={1}&redirect_uri={2}&code={3}",
this.facebookClient.AppId, this.facebookClient.AppSecret, HttpUtility.UrlEncode(Encoding.ASCII.GetBytes(returnUrl.AbsoluteUri)), authorizationCode);
using (WebClient client = new WebClient())
{
string str = client.DownloadString(builder.Uri);
if (string.IsNullOrEmpty(str))
return null;
return HttpUtility.ParseQueryString(str)["access_token"];
}
}
}
Вы также можете использовать его, зарегистрировав его в OAuthWebSecurity следующим образом (поместите метод RegisterAuth в Application_Start, как в шаблоне InternetApplication):
public static class AuthConfig
{
public static void RegisterAuth()
{
configuration.LoadFromAppSettings();
OAuthWebSecurity.RegisterClient(new FacebookExtendedClient(
"##YOUR_APP_ID##",
"##YOUR_APP_SECRET##",
"id,first_name,last_name,link,username,gender,email,age_range,picture.height(200)",
new Func<string, object, string>(fieldsTransformer),
"email"));
}
private static string fieldsTransformer(string key, object value)
{
switch (key)
{
case "picture":
var data = (value as IDictionary<string, object>)["data"] as IDictionary<string, object>;
return data["url"].ToString();
case "age_range":
var min = (value as IDictionary<string, object>)["min"];
return min.ToString();
default:
return value.ToString();
}
}
}
Как вы можете видеть в приведенном выше примере, метод fieldsTransformer получит ключ и значение для каждого выбранного поля, в этом случае он преобразует объект, полученный facebook для изображения, в URL-адрес изображения. Это удобный метод, если для параметра Func указано значение null, будет сохранено JSON-представление объекта значений.
Получить информацию о клиенте позже, после входа в систему, можно следующим образом:
[Authorize]
public class HomeController : Controller
{
public ActionResult Index()
{
IDictionary<string, string> userData = (OAuthWebSecurity.GetOAuthClientData("facebook").AuthenticationClient as FacebookExtendedClient).UserData;
string email = userData["email"];
// If leave null the fieldTransform of the client you can access to complex properties like this:
JObject picture = JObject.Parse(userData["picture"]);
string url = (picture["data"] as JObject)["url"].ToString();
ViewBag.Email = userData["email"];
ViewBag.PictureUrl = url;
return View();
}
}
Надеюсь, вам понравится этот код, даже если он немного запоздал! :)
person
Paolo Dragone
schedule
26.04.2013