Hook up ProximityAuthSystem in EasyUnlockService.

components/proximity_auth/messenger_impl.cc

Index: components/proximity_auth/messenger_impl.cc
diff --git a/components/proximity_auth/messenger_impl.cc b/components/proximity_auth/messenger_impl.cc
index 13bfac7a4e36a1f1b707508fdd62690d4d7c3ed7..aab4adee94b075eb0c7d274a2d639fb1fa854058 100644
--- a/components/proximity_auth/messenger_impl.cc
+++ b/components/proximity_auth/messenger_impl.cc
@@ -7,6 +7,8 @@
 #include "base/bind.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
+#include "base/location.h"
+#include "base/thread_task_runner_handle.h"
 #include "base/values.h"
 #include "components/proximity_auth/connection.h"
 #include "components/proximity_auth/cryptauth/base64url.h"
@@ -36,6 +38,15 @@ const char kMessageTypeUnlockResponse[] = "unlock_response";
 // The name for an unlock event originating from the local device.
 const char kUnlockEventName[] = "easy_unlock";
 
+// Messages sent and received from the iOS app when polling for it's lock screen
+// status.
+// TODO(tengs): Unify the iOS status update protocol with the existing Android
+// protocol, so we don't have this special case.
+const char kPollScreenState[] = "PollScreenState";
+const char kScreenUnlocked[] = "Screen Unlocked";
+const char kScreenLocked[] = "Screen Locked";
+const int kIOSPollingIntervalSeconds = 5;
+
 // Serializes the |value| to a JSON string and returns the result.
 std::string SerializeValueToJson(const base::Value& value) {
   std::string json;
@@ -61,6 +72,11 @@ MessengerImpl::MessengerImpl(scoped_ptr<Connection> connection,
       weak_ptr_factory_(this) {
   DCHECK(connection_->IsConnected());
   connection_->AddObserver(this);
+
+  // TODO(tengs): We need CryptAuth to report if the phone runs iOS or Android,
+  // rather than relying on this heuristic.
+  if (connection_->remote_device().bluetooth_type == RemoteDevice::BLUETOOTH_LE)
+    PollScreenStateForIOS();
 }
 
 MessengerImpl::~MessengerImpl() {
@@ -243,6 +259,20 @@ void MessengerImpl::HandleUnlockResponseMessage(
   FOR_EACH_OBSERVER(MessengerObserver, observers_, OnUnlockResponse(true));
 }
 
+void MessengerImpl::PollScreenStateForIOS() {
+  if (!connection_->IsConnected())
+    return;
+
+  // Sends message requesting screen state.
+  connection_->SendMessage(make_scoped_ptr(new WireMessage(kPollScreenState)));

[sacomoto, 2015/10/01 16:09:08]

We should encrypt the messages to iOS too.

+
+  // Schedules the next message in |kPollingIntervalSeconds|.
+  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
+      FROM_HERE, base::Bind(&MessengerImpl::PollScreenStateForIOS,
+                            weak_ptr_factory_.GetWeakPtr()),
+      base::TimeDelta::FromSeconds(kIOSPollingIntervalSeconds));
+}
+
 void MessengerImpl::OnConnectionStatusChanged(Connection* connection,
                                               Connection::Status old_status,
                                               Connection::Status new_status) {
@@ -250,7 +280,6 @@ void MessengerImpl::OnConnectionStatusChanged(Connection* connection,
   if (new_status == Connection::DISCONNECTED) {
     PA_LOG(INFO) << "Secure channel disconnected...";
     connection_->RemoveObserver(this);
-    connection_.reset();
     FOR_EACH_OBSERVER(MessengerObserver, observers_, OnDisconnected());
     // TODO(isherman): Determine whether it's also necessary/appropriate to fire
     // this notification from the destructor.
@@ -259,6 +288,20 @@ void MessengerImpl::OnConnectionStatusChanged(Connection* connection,
 
 void MessengerImpl::OnMessageReceived(const Connection& connection,
                                       const WireMessage& wire_message) {
+  // TODO(tengs): Unify the iOS status update protocol with the existing Android
+  // protocol, so we don't have this special case.
+  std::string payload = wire_message.payload();

[sacomoto, 2015/10/01 16:09:08]

This message should be encrypted too.

+  if (payload == kScreenUnlocked || payload == kScreenLocked) {
+    RemoteStatusUpdate update;
+    update.user_presence =
+        (payload == kScreenUnlocked ? USER_PRESENT : USER_ABSENT);
+    update.secure_screen_lock_state = SECURE_SCREEN_LOCK_ENABLED;
+    update.trust_agent_state = TRUST_AGENT_ENABLED;
+    FOR_EACH_OBSERVER(MessengerObserver, observers_,
+                      OnRemoteStatusUpdate(update));
+    return;
+  }
+
   secure_context_->Decode(wire_message.payload(),
                           base::Bind(&MessengerImpl::OnMessageDecoded,
                                      weak_ptr_factory_.GetWeakPtr()));