Dispatch touchId authenticator request from UI

Once UI for showing users to authenticate using Touch Id authenticator
is rendered, dispatch request to device/fido layer.

Bug: 847985
Change-Id: I9531d412e5c3f6626a6a80bb3b1b6128712c132e
Reviewed-on: https://chromium-review.googlesource.com/1177442
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#584226}

chrome/browser/webauthn/authenticator_request_dialog_model.cc

@@ -4,6 +4,8 @@
 
 #include "chrome/browser/webauthn/authenticator_request_dialog_model.h"
 
+#include <utility>
+
 #include "base/stl_util.h"
 
 namespace {
@@ -62,9 +64,9 @@ AuthenticatorTransport ToAuthenticatorTransport(
 // AuthenticatorRequestDialogModel::AuthenticatorReference --------------------
 
 AuthenticatorRequestDialogModel::AuthenticatorReference::AuthenticatorReference(
-    base::StringPiece device_id,
+    base::StringPiece authenticator_id,
     device::FidoTransportProtocol transport)
-    : device_id(device_id), transport(transport) {}
+    : authenticator_id(authenticator_id), transport(transport) {}
 AuthenticatorRequestDialogModel::AuthenticatorReference::AuthenticatorReference(
     AuthenticatorReference&& data) = default;
 AuthenticatorRequestDialogModel::AuthenticatorReference&
@@ -133,7 +135,7 @@ void AuthenticatorRequestDialogModel::StartGuidedFlowForTransport(
       SetCurrentStep(Step::kTransportSelection);
       break;
     case AuthenticatorTransport::kInternal:
-      SetCurrentStep(Step::kTouchId);
+      TryTouchId();
       break;
     case AuthenticatorTransport::kBluetoothLowEnergy:
       SetCurrentStep(Step::kBleActivate);
@@ -173,7 +175,21 @@ void AuthenticatorRequestDialogModel::TryUsbDevice() {
 }
 
 void AuthenticatorRequestDialogModel::TryTouchId() {
-  DCHECK_EQ(current_step(), Step::kTouchId);
+  SetCurrentStep(Step::kTouchId);
+  if (!request_callback_)
+    return;
+
+  auto touch_id_authenticator =
+      std::find_if(saved_authenticators_.begin(), saved_authenticators_.end(),
+                   [](const auto& authenticator) {
+                     return authenticator.transport ==
+                            device::FidoTransportProtocol::kInternal;
+                   });
+
+  if (touch_id_authenticator == saved_authenticators_.end())
+    return;
+
+  request_callback_.Run(touch_id_authenticator->authenticator_id);
 }
 
 void AuthenticatorRequestDialogModel::Cancel() {
@@ -209,3 +225,8 @@ void AuthenticatorRequestDialogModel::OnBluetoothPoweredStateChanged(
     bool powered) {
   transport_availability_.is_ble_powered = powered;
 }
+
+void AuthenticatorRequestDialogModel::SetRequestCallback(
+    device::FidoRequestHandlerBase::RequestCallback request_callback) {
+  request_callback_ = request_callback;
+}

chrome/browser/webauthn/authenticator_request_dialog_model.h

@@ -70,7 +70,7 @@ class AuthenticatorRequestDialogModel {
 
     ~AuthenticatorReference();
 
-    std::string device_id;
+    std::string authenticator_id;
     device::FidoTransportProtocol transport;
   };
 
@@ -183,6 +183,9 @@ class AuthenticatorRequestDialogModel {
   // To be called when the Bluetooth adapter powered state changes.
   void OnBluetoothPoweredStateChanged(bool powered);
 
+  void SetRequestCallback(
+      device::FidoRequestHandlerBase::RequestCallback request_callback);
+
   std::vector<AuthenticatorReference>& saved_authenticators() {
     return saved_authenticators_;
   }
@@ -202,6 +205,7 @@ class AuthenticatorRequestDialogModel {
   // that the WebAuthN request for the corresponding authenticators can be
   // dispatched lazily after the user interacts with the UI element.
   std::vector<AuthenticatorReference> saved_authenticators_;
+  device::FidoRequestHandlerBase::RequestCallback request_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(AuthenticatorRequestDialogModel);
 };

chrome/browser/webauthn/chrome_authenticator_request_delegate.cc

@@ -65,9 +65,13 @@ bool IsWebAuthnUiEnabled() {
 
 bool ShouldDispatchRequestImmediately(
     const device::FidoAuthenticator& authenticator) {
-  // TODO(hongjunchoi): Change this so that requests for BLE and platform
-  // authenticators are not dispatched immediately if WebAuthN UI is enabled.
+  // TODO(hongjunchoi): Change this so that requests for BLE authenticators are
+  // not dispatched immediately if WebAuthN UI is enabled.
+  if (!IsWebAuthnUiEnabled())
     return true;
+
+  return authenticator.AuthenticatorTransport() !=
+         device::FidoTransportProtocol::kInternal;
 }
 
 }  // namespace
@@ -137,6 +141,7 @@ void ChromeAuthenticatorRequestDelegate::RegisterActionCallbacks(
 
   transient_dialog_model_holder_ =
       std::make_unique<AuthenticatorRequestDialogModel>();
+  transient_dialog_model_holder_->SetRequestCallback(request_callback);
   weak_dialog_model_ = transient_dialog_model_holder_.get();
   weak_dialog_model_->AddObserver(this);
 }
@@ -279,7 +284,7 @@ void ChromeAuthenticatorRequestDelegate::FidoAuthenticatorAdded(
 }
 
 void ChromeAuthenticatorRequestDelegate::FidoAuthenticatorRemoved(
-    base::StringPiece device_id) {
+    base::StringPiece authenticator_id) {
   if (!IsWebAuthnUiEnabled())
     return;
 
@@ -289,8 +294,9 @@ void ChromeAuthenticatorRequestDelegate::FidoAuthenticatorRemoved(
   auto& saved_authenticators = weak_dialog_model_->saved_authenticators();
   saved_authenticators.erase(
       std::remove_if(saved_authenticators.begin(), saved_authenticators.end(),
-                     [device_id](const auto& authenticator_reference) {
-                       return authenticator_reference.device_id == device_id;
+                     [authenticator_id](const auto& authenticator_reference) {
+                       return authenticator_reference.authenticator_id ==
+                              authenticator_id;
                      }),
       saved_authenticators.end());
 }

chrome/browser/webauthn/chrome_authenticator_request_delegate.h

@@ -81,7 +81,7 @@ class ChromeAuthenticatorRequestDelegate
       device::FidoRequestHandlerBase::TransportAvailabilityInfo data) override;
   void FidoAuthenticatorAdded(const device::FidoAuthenticator& authenticator,
                               bool* hold_off_request) override;
-  void FidoAuthenticatorRemoved(base::StringPiece device_id) override;
+  void FidoAuthenticatorRemoved(base::StringPiece authenticator_id) override;
 
   // AuthenticatorRequestDialogModel::Observer:
   void OnModelDestroyed() override;