Hook up ProximityAuthSystem in EasyUnlockService.

components/proximity_auth/messenger_impl.cc

 // Copyright 2014 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 "components/proximity_auth/messenger_impl.h"
 
 #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"
 #include "components/proximity_auth/logging/logging.h"
 #include "components/proximity_auth/messenger_observer.h"
 #include "components/proximity_auth/remote_status_update.h"
 #include "components/proximity_auth/secure_context.h"
 #include "components/proximity_auth/wire_message.h"
 
 namespace proximity_auth {
 namespace {
 
 // The key names of JSON fields for messages sent between the devices.
 const char kTypeKey[] = "type";
 const char kNameKey[] = "name";
 const char kDataKey[] = "data";
 const char kEncryptedDataKey[] = "encrypted_data";
 
 // The types of messages that can be sent and received.
 const char kMessageTypeLocalEvent[] = "event";
 const char kMessageTypeRemoteStatusUpdate[] = "status_update";
 const char kMessageTypeDecryptRequest[] = "decrypt_request";
 const char kMessageTypeDecryptResponse[] = "decrypt_response";
 const char kMessageTypeUnlockRequest[] = "unlock_request";
 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;
   base::JSONWriter::Write(value, &json);
   return json;
 }
 
 // Returns the message type represented by the |message|. This is a convenience
 // wrapper that should only be called when the |message| is known to specify its
 // message type, i.e. this should not be called for untrusted input.
 std::string GetMessageType(const base::DictionaryValue& message) {
   std::string type;
   message.GetString(kTypeKey, &type);
   return type;
 }
 
 }  // namespace
 
 MessengerImpl::MessengerImpl(scoped_ptr<Connection> connection,
                              scoped_ptr<SecureContext> secure_context)
     : connection_(connection.Pass()),
       secure_context_(secure_context.Pass()),
       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() {
   if (connection_)
     connection_->RemoveObserver(this);
 }
 
 void MessengerImpl::AddObserver(MessengerObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void MessengerImpl::RemoveObserver(MessengerObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 bool MessengerImpl::SupportsSignIn() const {
+  // TODO(tengs): Support sign-in for Bluetooth LE protocol.
   return (secure_context_->GetProtocolVersion() ==
-          SecureContext::PROTOCOL_VERSION_THREE_ONE);
+          SecureContext::PROTOCOL_VERSION_THREE_ONE) &&
+         connection_->remote_device().bluetooth_type !=
+             RemoteDevice::BLUETOOTH_LE;
 }
 
 void MessengerImpl::DispatchUnlockEvent() {
   base::DictionaryValue message;
   message.SetString(kTypeKey, kMessageTypeLocalEvent);
   message.SetString(kNameKey, kUnlockEventName);
   queued_messages_.push_back(PendingMessage(message));
   ProcessMessageQueue();
 }
 
@@ skipping 32 matching lines @@
   ProcessMessageQueue();
 }
 
 MessengerImpl::PendingMessage::PendingMessage() {}
 
 MessengerImpl::PendingMessage::PendingMessage(
     const base::DictionaryValue& message)
     : json_message(SerializeValueToJson(message)),
       type(GetMessageType(message)) {}
 
+MessengerImpl::PendingMessage::PendingMessage(const std::string& message)
+    : json_message(message), type(std::string()) {}
+
 MessengerImpl::PendingMessage::~PendingMessage() {}
 
 void MessengerImpl::ProcessMessageQueue() {
   if (pending_message_ || queued_messages_.empty() ||
       connection_->is_sending_message())
     return;
 
   pending_message_.reset(new PendingMessage(queued_messages_.front()));
   queued_messages_.pop_front();
 
   secure_context_->Encode(pending_message_->json_message,
                           base::Bind(&MessengerImpl::OnMessageEncoded,
                                      weak_ptr_factory_.GetWeakPtr()));
 }
 
 void MessengerImpl::OnMessageEncoded(const std::string& encoded_message) {
   connection_->SendMessage(make_scoped_ptr(new WireMessage(encoded_message)));
 }
 
 void MessengerImpl::OnMessageDecoded(const std::string& decoded_message) {
+  // TODO(tengs): Unify the iOS status update protocol with the existing Android
+  // protocol, so we don't have this special case.
+  if (decoded_message == kScreenUnlocked || decoded_message == kScreenLocked) {
+    RemoteStatusUpdate update;
+    update.user_presence =
+        (decoded_message == 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));
+    pending_message_.reset();
+    ProcessMessageQueue();
+    return;
+  }
+
   // The decoded message should be a JSON string.
   scoped_ptr<base::Value> message_value =
       base::JSONReader::Read(decoded_message);
   if (!message_value || !message_value->IsType(base::Value::TYPE_DICTIONARY)) {
     PA_LOG(ERROR) << "Unable to parse message as JSON:\n" << decoded_message;
     return;
   }
 
   base::DictionaryValue* message;
   bool success = message_value->GetAsDictionary(&message);
@@ skipping 72 matching lines @@
   }
   FOR_EACH_OBSERVER(MessengerObserver, observers_,
                     OnDecryptResponse(response.Pass()));
 }
 
 void MessengerImpl::HandleUnlockResponseMessage(
     const base::DictionaryValue& message) {
   FOR_EACH_OBSERVER(MessengerObserver, observers_, OnUnlockResponse(true));
 }
 
+void MessengerImpl::PollScreenStateForIOS() {
+  if (!connection_->IsConnected())
+    return;
+
+  // Sends message requesting screen state.
+  queued_messages_.push_back(PendingMessage(std::string(kPollScreenState)));
+  ProcessMessageQueue();
+
+  // 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) {
   DCHECK_EQ(connection, connection_.get());
   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.
   }
 }
 
 void MessengerImpl::OnMessageReceived(const Connection& connection,
                                       const WireMessage& wire_message) {
   secure_context_->Decode(wire_message.payload(),
                           base::Bind(&MessengerImpl::OnMessageDecoded,
@@ skipping 29 matching lines @@
   } else {
     PA_LOG(ERROR) << "Message of unknown type '" << pending_message_->type
                   << "' sent.";
   }
 
   pending_message_.reset();
   ProcessMessageQueue();
 }
 
 }  // namespace proximity_auth