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// Copyright (C) 2015, The Duplicati Team
// http://www.duplicati.com, info@duplicati.com
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
using System;
using System.Net;
using Duplicati.Library.Utility;
using System.Collections.Generic;
using System.Web;
namespace Duplicati.Library
{
/// <summary>
/// Class for providing call-context access to http settings
/// </summary>
public static class OAuthContextSettings
{
/// <summary>
/// The struct wrapping the OAuth settings
/// </summary>
private struct OAuthSettings
{
/// <summary>
/// The server url
/// </summary>
public string ServerURL;
}
/// <summary>
/// Starts the session.
/// </summary>
/// <returns>The session.</returns>
/// <param name="serverurl">The url to use for the server.</param>
public static IDisposable StartSession(string serverurl)
{
return CallContextSettings<OAuthSettings>.StartContext(new OAuthSettings() { ServerURL = serverurl });
}
/// <summary>
/// Gets the server URL to use for OAuth.
/// </summary>
public static string ServerURL
{
get
{
var r = CallContextSettings<OAuthSettings>.Settings.ServerURL;
return string.IsNullOrWhiteSpace(r) ? OAuthHelper.DUPLICATI_OAUTH_SERVICE : r;
}
}
}
public class OAuthHelper : JSONWebHelper
{
private string m_token;
private string m_authid;
private DateTime m_tokenExpires = DateTime.UtcNow;
public const string DUPLICATI_OAUTH_SERVICE = "https://duplicati-oauth-handler.appspot.com/refresh";
private const string OAUTH_LOGIN_URL_TEMPLATE = "https://duplicati-oauth-handler.appspot.com/?type={0}";
public static string OAUTH_LOGIN_URL(string modulename)
{
var u = new Library.Utility.Uri(OAuthContextSettings.ServerURL);
var addr = u.SetPath("").SetQuery((u.Query ?? "") + (string.IsNullOrWhiteSpace(u.Query) ? "" : "&") + "type={0}");
return string.Format(addr.ToString(), modulename);
}
/// <summary>
/// Set to true to automatically add the Authorization header to requets
/// </summary>
public bool AutoAuthHeader { get; set; }
/// <summary>
/// Set to true if the provider does not use refresh tokens, but only access tokens
/// </summary>
public bool AccessTokenOnly { get; set; }
public OAuthHelper(string authid, string servicename, string useragent = null)
: base(useragent)
{
m_authid = authid;
OAuthLoginUrl = OAUTH_LOGIN_URL(servicename);
if (string.IsNullOrEmpty(authid))
throw new Duplicati.Library.Interface.UserInformationException(Strings.OAuthHelper.MissingAuthID(OAuthLoginUrl));
}
public T GetTokenResponse<T>()
{
var req = CreateRequest(OAuthContextSettings.ServerURL);
req.Headers["X-AuthID"] = m_authid;
req.Timeout = (int)TimeSpan.FromSeconds(25).TotalMilliseconds;
return ReadJSONResponse<T>(req);
}
public override HttpWebRequest CreateRequest(string url, string method = null)
{
var r = base.CreateRequest(url, method);
if (AutoAuthHeader && !string.Equals(OAuthContextSettings.ServerURL, url))
r.Headers["Authorization"] = string.Format("Bearer {0}", AccessToken);
return r;
}
public string AccessToken
{
get
{
if (AccessTokenOnly)
return m_authid;
if (m_token == null || m_tokenExpires < DateTime.UtcNow)
{
var retries = 0;
while(true)
{
try
{
var res = GetTokenResponse<OAuth_Service_Response>();
m_tokenExpires = DateTime.UtcNow.AddSeconds(res.expires - 30);
if (!string.IsNullOrWhiteSpace(res.v2_authid))
m_authid = res.v2_authid;
return m_token = res.access_token;
}
catch (Exception ex)
{
var msg = ex.Message;
var clienterror = false;
if (ex is WebException)
{
var resp = ((WebException)ex).Response as HttpWebResponse;
if (resp != null)
{
msg = resp.Headers["X-Reason"];
if (string.IsNullOrWhiteSpace(msg))
msg = resp.StatusDescription;
if (resp.StatusCode == HttpStatusCode.ServiceUnavailable)
{
if (msg == resp.StatusDescription)
throw new Duplicati.Library.Interface.UserInformationException(Strings.OAuthHelper.OverQuotaError);
else
throw new Duplicati.Library.Interface.UserInformationException(Strings.OAuthHelper.AuthorizationFailure(msg, OAuthLoginUrl), ex);
}
//Fail faster on client errors
clienterror = (int)resp.StatusCode >= 400 && (int)resp.StatusCode <= 499;
}
}
if (retries >= (clienterror ? 1 : 5))
throw new Duplicati.Library.Interface.UserInformationException(Strings.OAuthHelper.AuthorizationFailure(msg, OAuthLoginUrl), ex);
System.Threading.Thread.Sleep(TimeSpan.FromSeconds(Math.Pow(2, retries)));
retries++;
}
}
}
return m_token;
}
}
public void ThrowOverQuotaError()
{
throw new Duplicati.Library.Interface.UserInformationException(Strings.OAuthHelper.OverQuotaError);
}
public void ThrowAuthException(string msg, Exception ex)
{
if (ex == null)
throw new Duplicati.Library.Interface.UserInformationException(Strings.OAuthHelper.AuthorizationFailure(msg, OAuthLoginUrl));
else
throw new Duplicati.Library.Interface.UserInformationException(Strings.OAuthHelper.AuthorizationFailure(msg, OAuthLoginUrl), ex);
}
private class OAuth_Service_Response
{
public string access_token { get; set; }
[Newtonsoft.Json.JsonProperty(NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
public int expires { get; set; }
[Newtonsoft.Json.JsonProperty(NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
public string v2_authid { get; set; }
}
}
}
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