Protocol / client plugin changes to support interactively asking for a PIN

remoting/protocol/pin_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/pin_client_authenticator.h"
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/logging.h"
+#include "remoting/protocol/channel_authenticator.h"
+#include "remoting/protocol/pin_fetcher.h"
+#include "remoting/protocol/v2_authenticator.h"
+#include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
+
+namespace remoting {
+namespace protocol {
+
+PinClientAuthenticator::PinClientAuthenticator(
+    AuthenticationMethod::HashFunction hash_function,
+    const std::string& authentication_tag,
+    scoped_ptr<PinFetcher> pin_fetcher,
+    Authenticator::State initial_state,
+    const base::Closure& resume_callback)
+    : hash_function_(hash_function),
+      authentication_tag_(authentication_tag),
+      pin_fetcher_(pin_fetcher.Pass()) {
+  DCHECK(pin_fetcher_);
+  pin_fetcher_->FetchPin(base::Bind(
+      &PinClientAuthenticator::OnPinFetched,
+      base::Unretained(this), initial_state, resume_callback));
+}
+
+PinClientAuthenticator::~PinClientAuthenticator() {
+}
+
+Authenticator::State PinClientAuthenticator::state() const {
+  DCHECK(underlying_);

[Sergey Ulanov, 2013/03/17 21:29:21]

What if this method is called before PIN is fetched?

[rmsousa, 2013/03/18 21:07:26]

That's illegal (hence the DCHECK).
NegotatingAuthenticator will be in a PROCESSING_MESSAGE state. In that state,
JingleSession will reject any incoming messages. Also, the call to
GetNextMessage() is inside the resume_callback, so it'll also only be called
when the PIN is received. Those are the only points in which the
NegotiatingAuthenticator checks the underlying state().

+  return underlying_->state();
+}
+
+Authenticator::RejectionReason
+PinClientAuthenticator::rejection_reason() const {
+  DCHECK(underlying_);
+  DCHECK_EQ(underlying_->state(), REJECTED);
+  return underlying_->rejection_reason();
+}
+
+void PinClientAuthenticator::ProcessMessage(
+    const buzz::XmlElement* message, const base::Closure& resume_callback) {
+  DCHECK(underlying_);
+  underlying_->ProcessMessage(message, resume_callback);
+}
+
+void PinClientAuthenticator::OnPinFetched(
+    Authenticator::State initial_state,
+    const base::Closure& resume_callback,
+    const std::string& shared_secret) {
+  underlying_ = V2Authenticator::CreateForClient(
+      AuthenticationMethod::ApplyHashFunction(
+          hash_function_, authentication_tag_, shared_secret),
+      initial_state);
+  resume_callback.Run();
+}
+
+
+scoped_ptr<buzz::XmlElement> PinClientAuthenticator::GetNextMessage() {
+  DCHECK(underlying_);
+  DCHECK_EQ(underlying_->state(), MESSAGE_READY);
+  return underlying_->GetNextMessage();
+}
+
+scoped_ptr<ChannelAuthenticator>
+PinClientAuthenticator::CreateChannelAuthenticator() const {
+  DCHECK(underlying_);
+  DCHECK_EQ(underlying_->state(), ACCEPTED);
+  return underlying_->CreateChannelAuthenticator();
+}
+
+}  // namespace protocol
+}  // namespace remoting
+