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using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Xml.Linq;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.OAuth;
using DotNetOpenAuth.OAuth.ChannelElements;
using DotNetOpenAuth.OAuth.Messages;
namespace DotNetOpenAuth.AspNet.Clients
{
/// <summary>
/// Represents a Twitter client
/// </summary>
public class TwitterClient : OAuthClient
{
/// <summary>
/// The description of Twitter's OAuth protocol URIs for use with their "Sign in with Twitter" feature.
/// </summary>
public static readonly ServiceProviderDescription TwitterServiceDescription = new ServiceProviderDescription
{
RequestTokenEndpoint = new MessageReceivingEndpoint("http://twitter.com/oauth/request_token", HttpDeliveryMethods.GetRequest | HttpDeliveryMethods.AuthorizationHeaderRequest),
UserAuthorizationEndpoint = new MessageReceivingEndpoint("http://twitter.com/oauth/authenticate", HttpDeliveryMethods.GetRequest | HttpDeliveryMethods.AuthorizationHeaderRequest),
AccessTokenEndpoint = new MessageReceivingEndpoint("http://twitter.com/oauth/access_token", HttpDeliveryMethods.GetRequest | HttpDeliveryMethods.AuthorizationHeaderRequest),
TamperProtectionElements = new ITamperProtectionChannelBindingElement[] { new HmacSha1SigningBindingElement() },
};
/// <summary>
/// Initializes a new instance of the <see cref="TwitterClient"/> class with the specified consumer key and consumer secret.
/// </summary>
/// <param name="consumerKey">The consumer key.</param>
/// <param name="consumerSecret">The consumer secret.</param>
[System.Diagnostics.CodeAnalysis.SuppressMessage(
"Microsoft.Reliability",
"CA2000:Dispose objects before losing scope",
Justification = "We can't dispose the object because we still need it through the app lifetime.")]
public TwitterClient(string consumerKey, string consumerSecret) :
base("twitter", TwitterServiceDescription, consumerKey, consumerSecret)
{
}
/// <summary>
/// Check if authentication succeeded after user is redirected back from the service provider.
/// </summary>
/// <param name="response">The response token returned from service provider</param>
/// <returns>
/// Authentication result
/// </returns>
[System.Diagnostics.CodeAnalysis.SuppressMessage(
"Microsoft.Design",
"CA1031:DoNotCatchGeneralExceptionTypes",
Justification = "We don't care if the request for additional data fails.")]
protected override AuthenticationResult VerifyAuthenticationCore(AuthorizedTokenResponse response)
{
string accessToken = response.AccessToken;
string userId = response.ExtraData["user_id"];
string userName = response.ExtraData["screen_name"];
string profileRequestUrl = "http://api.twitter.com/1/users/show.xml?user_id=" + Uri.EscapeDataString(userId);
var profileEndpoint = new MessageReceivingEndpoint(profileRequestUrl, HttpDeliveryMethods.GetRequest);
HttpWebRequest request = WebWorker.PrepareAuthorizedRequest(profileEndpoint, accessToken);
var extraData = new Dictionary<string, string>();
try
{
using (WebResponse profileResponse = request.GetResponse())
{
using (Stream responseStream = profileResponse.GetResponseStream())
{
XDocument document = XDocument.Load(responseStream);
extraData.AddDataIfNotEmpty(document, "name");
extraData.AddDataIfNotEmpty(document, "location");
extraData.AddDataIfNotEmpty(document, "description");
extraData.AddDataIfNotEmpty(document, "url");
}
}
}
catch (Exception)
{
// At this point, the authentication is already successful.
// Here we are just trying to get additional data if we can.
// If it fails, no problem.
}
return new AuthenticationResult(
isSuccessful: true,
provider: ProviderName,
providerUserId: userId,
userName: userName,
extraData: extraData);
}
}
}
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