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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/views/webauthn/mac_authentication_view.h"
#import <LocalAuthentication/LocalAuthentication.h>
#import <LocalAuthenticationEmbeddedUI/LocalAuthenticationEmbeddedUI.h>
#include "base/logging.h"
#include "base/strings/sys_string_conversions.h"
#include "base/timer/timer.h"
#include "chrome/browser/webauthn/local_authentication_token.h"
#include "components/device_event_log/device_event_log.h"
#include "content/public/browser/browser_thread.h"
#include "crypto/scoped_lacontext.h"
#include "device/fido/mac/util.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/gfx/canvas.h"
#include "ui/views/widget/widget.h"
// kWidth is the width (and height, since it's square) of the NSView.
constexpr int kWidth = 64;
// The seconds it takes for the Touch ID animation to finish when the challenge
// fails.
constexpr float kErrorAnimationLength = 1;
// The seconds it takes for the Touch ID animation to finish when the challenge
// succeeds. This is trimmed down so that we can overlap the enclave operation
// with the animation.
constexpr float kSuccessAnimationLength = 1.6;
struct MacAuthenticationView::ObjCStorage {
LAContext* __strong context;
LAAuthenticationView* __strong auth_view;
};
MacAuthenticationView::MacAuthenticationView(Callback callback,
std::u16string touch_id_reason)
: callback_(std::move(callback)),
storage_(std::make_unique<ObjCStorage>()),
touch_id_reason_(std::move(touch_id_reason)) {
storage_->context = [[LAContext alloc] init];
storage_->auth_view =
[[LAAuthenticationView alloc] initWithContext:storage_->context];
// The size of the NSView is set as constraints on itself. But none of the
// standard sizes match the size used in Safari. Thus we erase them set our
// own.
[storage_->auth_view removeConstraints:storage_->auth_view.constraints];
[storage_->auth_view.widthAnchor constraintEqualToConstant:kWidth].active =
YES;
[storage_->auth_view.heightAnchor constraintEqualToConstant:kWidth].active =
YES;
return;
}
MacAuthenticationView::~MacAuthenticationView() = default;
gfx::Size MacAuthenticationView::CalculatePreferredSize(
const views::SizeBounds& available_size) const {
return gfx::Size(kWidth, kWidth);
}
void MacAuthenticationView::AddedToWidget() {
// An `LAAuthenticationView` is an NSView, but Chromium uses the Views
// framework for its UI, which just renders pixels onto a backing surface
// (called a "widget"). Thus any NSViews have to be composited onto what
// Views renders and positioned in the right place.
//
// Here the `LAAuthenticationView` is added to the NSWindow for this View, and
// positioned above it so that it's painted on top. We assume that the first
// existing NSView in the NSWindow is the `ViewsCompositorSuperview` that
// Views renders onto.
NSWindow* window = GetWidget()->GetNativeWindow().GetNativeNSWindow();
[window.contentView addSubview:storage_->auth_view
positioned:NSWindowAbove
relativeTo:window.contentView.subviews[0]];
}
void MacAuthenticationView::RemovedFromWidget() {
[storage_->auth_view removeFromSuperview];
}
void MacAuthenticationView::Layout(PassKey) {
gfx::Rect bounds = this->bounds();
// The bounds of this View include the offset from its parent View.
// However, `ConvertPointToWidget` (below) already takes this offset into
// account so it must be zeroed here to avoid it being applied twice.
bounds.set_x(0);
bounds.set_y(0);
// The LAAuthenticationView is centered within this View.
bounds.ClampToCenteredSize(gfx::Size(kWidth, kWidth));
// The Widget represents the backing surface onto which Views renders. We need
// to know the position of the LAAuthenticationView in relation to the widget
// because NSView doesn't know anything about Chromium's Views tree.
gfx::Point point = bounds.origin();
View::ConvertPointToWidget(this, &point);
// Views puts (0, 0) at the top left and positive-y is downwards. But NSView
// puts (0,0) at the bottom-left and positive-y is up. So we need to know the
// height of the Widget to adjust things.
gfx::Rect widget_rect = this->GetWidget()->GetClientAreaBoundsInScreen();
// Place the LAAuthenticationView after adjusting for the different coordinate
// system.
storage_->auth_view.frame =
NSMakeRect(point.x(), widget_rect.height() - point.y() - bounds.height(),
kWidth, kWidth);
}
void MacAuthenticationView::OnPaint(gfx::Canvas* canvas) {
views::View::OnPaint(canvas);
if (GetVisible() && !evaluation_requested_) {
InvalidateLayout();
storage_->auth_view.hidden = false;
evaluation_requested_ = true;
if (!device::fido::mac::DeviceHasBiometricsAvailable()) {
return;
}
__block auto internal_callback =
base::BindOnce(&MacAuthenticationView::OnAuthenticationComplete,
weak_factory_.GetWeakPtr());
[storage_->context
evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
localizedReason:base::SysUTF16ToNSString(touch_id_reason_)
reply:^(BOOL success, NSError* error) {
if (error) {
FIDO_LOG(ERROR) << "Touch ID failed with error: "
<< error.localizedDescription.UTF8String;
}
content::BrowserThread::GetTaskRunnerForThread(
content::BrowserThread::UI)
->PostTask(FROM_HERE,
base::BindOnce(std::move(internal_callback),
success));
}];
}
}
void MacAuthenticationView::VisibilityChanged(views::View* from,
bool is_visible) {
views::View::VisibilityChanged(from, is_visible);
storage_->auth_view.hidden = !is_visible;
}
void MacAuthenticationView::OnAuthenticationComplete(bool success) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
// It takes a while for the Touch ID animation to finish after success is
// reported. Avoid jank by waiting for the animation to finish before
// notifying the client.
touch_id_animation_timer_.Start(
FROM_HERE,
base::Seconds(success ? kSuccessAnimationLength : kErrorAnimationLength),
base::BindOnce(&MacAuthenticationView::OnTouchIDAnimationComplete,
base::Unretained(this), success));
}
void MacAuthenticationView::OnTouchIDAnimationComplete(bool success) {
std::optional<webauthn::LocalAuthenticationToken> local_auth_token;
if (success) {
local_auth_token.emplace(storage_->context);
}
storage_->context = nil;
std::move(callback_).Run(std::move(local_auth_token));
}
BEGIN_METADATA(MacAuthenticationView)
END_METADATA
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