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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_PROTOCOL_THIRD_PARTY_CLIENT_AUTHENTICATOR_H_
#define REMOTING_PROTOCOL_THIRD_PARTY_CLIENT_AUTHENTICATOR_H_
#include <string>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "remoting/protocol/third_party_authenticator_base.h"
#include "url/gurl.h"
class GURL;
namespace remoting {
namespace protocol {
// Implements the client side of the third party authentication mechanism.
// The client authenticator expects a |token_url| and |scope| in the first
// message from the host, then calls the |TokenFetcher| asynchronously to
// request a |token| and |shared_secret| from that url. If the server requires
// interactive authentication, the |TokenFetcher| implementation will show the
// appropriate UI. Once the |TokenFetcher| returns, the client sends the |token|
// to the host, and uses the |shared_secret| to create an underlying
// |V2Authenticator|, which is used to establish the encrypted connection.
class ThirdPartyClientAuthenticator : public ThirdPartyAuthenticatorBase {
public:
class TokenFetcher {
public:
// Callback passed to |FetchThirdPartyToken|, and called once the client
// authentication finishes. |token| is an opaque string that should be sent
// directly to the host. |shared_secret| should be used by the client to
// create a V2Authenticator. In case of failure, the callback is called with
// an empty |token| and |shared_secret|.
typedef base::Callback<void(
const std::string& token,
const std::string& shared_secret)> TokenFetchedCallback;
virtual ~TokenFetcher() {}
// Fetches a third party token from |token_url|. |host_public_key| is sent
// to the server so it can later authenticate the host. |scope| is a string
// with a space-separated list of attributes for this connection (e.g.
// "hostjid:abc@example.com/123 clientjid:def@example.org/456".
// |token_fetched_callback| is called when the client authentication ends,
// in the same thread |FetchThirdPartyToken| was originally called.
// The request is canceled if the TokenFetcher is destroyed.
virtual void FetchThirdPartyToken(
const GURL& token_url,
const std::string& scope,
const TokenFetchedCallback& token_fetched_callback) = 0;
};
// Creates a third-party client authenticator for the host with the given
// |host_public_key|. |token_fetcher| is used to get the authentication token.
explicit ThirdPartyClientAuthenticator(
scoped_ptr<TokenFetcher> token_fetcher);
~ThirdPartyClientAuthenticator() override;
protected:
// ThirdPartyAuthenticator implementation.
void ProcessTokenMessage(const buzz::XmlElement* message,
const base::Closure& resume_callback) override;
void AddTokenElements(buzz::XmlElement* message) override;
private:
void OnThirdPartyTokenFetched(const base::Closure& resume_callback,
const std::string& third_party_token,
const std::string& shared_secret);
std::string token_;
scoped_ptr<TokenFetcher> token_fetcher_;
DISALLOW_COPY_AND_ASSIGN(ThirdPartyClientAuthenticator);
};
} // namespace protocol
} // namespace remoting
#endif // REMOTING_PROTOCOL_THIRD_PARTY_CLIENT_AUTHENTICATOR_H_