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//-----------------------------------------------------------------------
// <copyright file="FacebookClient.cs" company="Microsoft">
// Copyright (c) Microsoft. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.AspNet.Clients {
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Net;
using System.Web;
using DotNetOpenAuth.AspNet.Resources;
using DotNetOpenAuth.Messaging;
public sealed class FacebookClient : OAuth2Client {
private const string AuthorizationEndpoint = "https://www.facebook.com/dialog/oauth";
private const string TokenEndpoint = "https://graph.facebook.com/oauth/access_token";
private readonly string _appId;
private readonly string _appSecret;
public FacebookClient(string appId, string appSecret)
: base("facebook") {
if (String.IsNullOrEmpty(appId)) {
throw new ArgumentException(
String.Format(CultureInfo.CurrentCulture, WebResources.Argument_Cannot_Be_Null_Or_Empty, "appId"),
"appId");
}
if (String.IsNullOrEmpty("appSecret")) {
throw new ArgumentException(
String.Format(CultureInfo.CurrentCulture, WebResources.Argument_Cannot_Be_Null_Or_Empty, "appSecret"),
"appSecret");
}
_appId = appId;
_appSecret = appSecret;
}
protected override Uri GetServiceLoginUrl(Uri returnUrl) {
// Note: Facebook doesn't like us to url-encode the redirect_uri value
var builder = new UriBuilder(AuthorizationEndpoint);
MessagingUtilities.AppendQueryArgs(builder,
new KeyValuePair<string, string>[] {
new KeyValuePair<string, string>("client_id", _appId),
new KeyValuePair<string, string>("redirect_uri", returnUrl.ToString())
});
return builder.Uri;
}
protected override string QueryAccessToken(Uri returnUrl, string authorizationCode) {
// Note: Facebook doesn't like us to url-encode the redirect_uri value
var builder = new UriBuilder(TokenEndpoint);
MessagingUtilities.AppendQueryArgs(builder,
new KeyValuePair<string, string>[] {
new KeyValuePair<string, string>("client_id", _appId),
new KeyValuePair<string, string>("redirect_uri", returnUrl.ToString()),
new KeyValuePair<string, string>("client_secret", _appSecret),
new KeyValuePair<string, string>("code", authorizationCode)
});
using (WebClient client = new WebClient()) {
string data = client.DownloadString(builder.Uri);
if (String.IsNullOrEmpty(data)) {
return null;
}
var parsedQueryString = HttpUtility.ParseQueryString(data);
if (parsedQueryString != null) {
return parsedQueryString["access_token"];
}
}
return null;
}
protected override IDictionary<string, string> GetUserData(string accessToken) {
FacebookGraphData graphData;
var request = WebRequest.Create("https://graph.facebook.com/me?access_token=" + Uri.EscapeDataString(accessToken));
using (var response = request.GetResponse()) {
using (var responseStream = response.GetResponseStream()) {
graphData = JsonHelper.Deserialize<FacebookGraphData>(responseStream);
}
}
// this dictionary must contains
var userData = new Dictionary<string, string>();
userData.AddItemIfNotEmpty("id", graphData.Id);
userData.AddItemIfNotEmpty("username", graphData.Email);
userData.AddItemIfNotEmpty("name", graphData.Name);
userData.AddItemIfNotEmpty("link", graphData.Link == null ? null : graphData.Link.ToString());
userData.AddItemIfNotEmpty("gender", graphData.Gender);
userData.AddItemIfNotEmpty("birthday", graphData.Birthday);
return userData;
}
}
}
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