Third Party authentication protocol.

remoting/protocol/third_party_client_authenticator.cc

+// 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.
+
+#include "remoting/protocol/third_party_client_authenticator.h"
+
+#include "base/base64.h"
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/logging.h"
+#include "googleurl/src/gurl.h"
+#include "remoting/base/constants.h"
+#include "remoting/base/rsa_key_pair.h"
+#include "remoting/protocol/channel_authenticator.h"
+#include "remoting/protocol/v2_authenticator.h"
+#include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
+
+namespace remoting {
+namespace protocol {
+
+ThirdPartyClientAuthenticator::ThirdPartyClientAuthenticator(
+    const std::string& host_public_key,
+    scoped_ptr<TokenFetcher> token_fetcher)
+    : ThirdPartyAuthenticatorBase(WAITING_MESSAGE),
+      host_public_key_(host_public_key),
+      token_fetcher_(token_fetcher.Pass()) {
+}
+
+ThirdPartyClientAuthenticator::~ThirdPartyClientAuthenticator() {
+}
+
+void ThirdPartyClientAuthenticator::ProcessTokenMessage(
+    const buzz::XmlElement* message,
+    const base::Closure& resume_callback) {
+  std::string token_url = message->TextNamed(kTokenUrlTag);
+  std::string token_scope = message->TextNamed(kTokenScopeTag);

[Wez, 2013/03/22 06:17:01]

nit: I think it'd be easier to read if the error case came first.

[rmsousa, 2013/03/22 21:19:05]

Done.

+  if (!token_url.empty() && !token_scope.empty()) {
+    token_state_ = PROCESSING_MESSAGE;

[Wez, 2013/03/22 06:17:01]

nit: blank line before comment

[rmsousa, 2013/03/22 21:19:05]

Done.

+    // |token_fetcher_| is owned, so Unretained() is safe here.
+    token_fetcher_->FetchThirdPartyToken(
+        GURL(token_url), host_public_key_, token_scope, base::Bind(
+            &ThirdPartyClientAuthenticator::OnThirdPartyTokenFetched,
+            base::Unretained(this), resume_callback));
+    return;
+  }
+
+  LOG(ERROR) << "Third-party authentication protocol error: "
+      "missing token verification URL or scope.";
+  token_state_ = REJECTED;
+  rejection_reason_ = PROTOCOL_ERROR;
+  resume_callback.Run();
+}
+
+void ThirdPartyClientAuthenticator::AddTokenElements(
+    buzz::XmlElement* message) {
+  DCHECK(token_state_ == MESSAGE_READY);

[Sergey Ulanov, 2013/03/22 05:58:43]

DCHECK_EQ

[rmsousa, 2013/03/22 21:19:05]

Done.

+  DCHECK(!token_.empty());
+
+  buzz::XmlElement* token_tag = new buzz::XmlElement(kTokenTag);
+  token_tag->SetBodyText(token_);
+  message->AddElement(token_tag);
+  token_state_ = ACCEPTED;
+}
+
+void ThirdPartyClientAuthenticator::OnThirdPartyTokenFetched(
+    const base::Closure& resume_callback,
+    const std::string& third_party_token,
+    const std::string& shared_secret) {
+  token_ = third_party_token;
+  if (!token_.empty() && !shared_secret.empty()) {

[Wez, 2013/03/22 06:17:01]

nit: Similarly, checking token.empty() || shared_secret.empty() would be
(slightly) easier to read.

[rmsousa, 2013/03/22 21:19:05]

Done.

+    token_state_ = MESSAGE_READY;
+    underlying_ = V2Authenticator::CreateForClient(
+        shared_secret, MESSAGE_READY);
+  } else {
+    token_state_ = REJECTED;
+    rejection_reason_ = INVALID_CREDENTIALS;
+  }
+  resume_callback.Run();
+}
+
+}  // namespace protocol
+}  // namespace remoting