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// Copyright 2019 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 "content/browser/hid/hid_service.h"
#include <utility>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/callback.h"
#include "base/debug/stack_trace.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/hid_chooser.h"
#include "content/public/browser/hid_delegate.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/common/content_client.h"
#include "mojo/public/cpp/bindings/message.h"
#include "third_party/blink/public/mojom/feature_policy/feature_policy.mojom.h"
namespace content {
HidService::HidService(RenderFrameHost* render_frame_host,
mojo::PendingReceiver<blink::mojom::HidService> receiver)
: FrameServiceBase(render_frame_host, std::move(receiver)) {
watchers_.set_disconnect_handler(base::BindRepeating(
&HidService::OnWatcherConnectionError, base::Unretained(this)));
HidDelegate* delegate = GetContentClient()->browser()->GetHidDelegate();
if (delegate)
delegate->AddObserver(render_frame_host, this);
}
HidService::~HidService() {
HidDelegate* delegate = GetContentClient()->browser()->GetHidDelegate();
if (delegate)
delegate->RemoveObserver(render_frame_host(), this);
// The remaining watchers will be closed from this end.
if (!watchers_.empty())
DecrementActiveFrameCount();
}
// static
void HidService::Create(
RenderFrameHost* render_frame_host,
mojo::PendingReceiver<blink::mojom::HidService> receiver) {
DCHECK(render_frame_host);
if (!render_frame_host->IsFeatureEnabled(
blink::mojom::FeaturePolicyFeature::kHid)) {
mojo::ReportBadMessage("Feature policy blocks access to HID.");
return;
}
// Avoid creating the HidService if there is no HID delegate to provide the
// implementation.
if (!GetContentClient()->browser()->GetHidDelegate())
return;
// HidService owns itself. It will self-destruct when a mojo interface error
// occurs, the render frame host is deleted, or the render frame host
// navigates to a new document.
new HidService(render_frame_host, std::move(receiver));
}
void HidService::RegisterClient(
device::mojom::HidManagerClientAssociatedPtrInfo client) {
clients_.Add(std::move(client));
}
void HidService::GetDevices(GetDevicesCallback callback) {
GetContentClient()
->browser()
->GetHidDelegate()
->GetHidManager(WebContents::FromRenderFrameHost(render_frame_host()))
->GetDevices(base::BindOnce(&HidService::FinishGetDevices,
weak_factory_.GetWeakPtr(),
std::move(callback)));
}
void HidService::RequestDevice(
std::vector<blink::mojom::HidDeviceFilterPtr> filters,
RequestDeviceCallback callback) {
HidDelegate* delegate = GetContentClient()->browser()->GetHidDelegate();
if (!delegate->CanRequestDevicePermission(
WebContents::FromRenderFrameHost(render_frame_host()), origin())) {
std::move(callback).Run(std::vector<device::mojom::HidDeviceInfoPtr>());
return;
}
chooser_ = delegate->RunChooser(
render_frame_host(), std::move(filters),
base::BindOnce(&HidService::FinishRequestDevice,
weak_factory_.GetWeakPtr(), std::move(callback)));
}
void HidService::Connect(
const std::string& device_guid,
mojo::PendingRemote<device::mojom::HidConnectionClient> client,
ConnectCallback callback) {
if (watchers_.empty()) {
auto* web_contents_impl = static_cast<WebContentsImpl*>(
WebContents::FromRenderFrameHost(render_frame_host()));
web_contents_impl->IncrementHidActiveFrameCount();
}
mojo::PendingRemote<device::mojom::HidConnectionWatcher> watcher;
watchers_.Add(this, watcher.InitWithNewPipeAndPassReceiver());
GetContentClient()
->browser()
->GetHidDelegate()
->GetHidManager(WebContents::FromRenderFrameHost(render_frame_host()))
->Connect(
device_guid, std::move(client), std::move(watcher),
base::BindOnce(&HidService::FinishConnect, weak_factory_.GetWeakPtr(),
std::move(callback)));
}
void HidService::OnWatcherConnectionError() {
if (watchers_.empty())
DecrementActiveFrameCount();
}
void HidService::DecrementActiveFrameCount() {
auto* web_contents_impl = static_cast<WebContentsImpl*>(
WebContents::FromRenderFrameHost(render_frame_host()));
web_contents_impl->DecrementHidActiveFrameCount();
}
void HidService::OnDeviceAdded(
const device::mojom::HidDeviceInfo& device_info) {
if (!GetContentClient()->browser()->GetHidDelegate()->HasDevicePermission(
WebContents::FromRenderFrameHost(render_frame_host()), origin(),
device_info)) {
return;
}
for (auto& client : clients_)
client->DeviceAdded(device_info.Clone());
}
void HidService::OnDeviceRemoved(
const device::mojom::HidDeviceInfo& device_info) {
if (!GetContentClient()->browser()->GetHidDelegate()->HasDevicePermission(
WebContents::FromRenderFrameHost(render_frame_host()), origin(),
device_info)) {
return;
}
for (auto& client : clients_)
client->DeviceRemoved(device_info.Clone());
}
void HidService::OnHidManagerConnectionError() {
// Close the connection with Blink.
clients_.Clear();
}
void HidService::OnPermissionRevoked(const url::Origin& requesting_origin,
const url::Origin& embedding_origin) {
if (requesting_origin_ != requesting_origin ||
embedding_origin_ != embedding_origin) {
return;
}
// TODO(mattreynolds): Close connection between Blink and the device if the
// device lost permission.
}
void HidService::FinishGetDevices(
GetDevicesCallback callback,
std::vector<device::mojom::HidDeviceInfoPtr> devices) {
std::vector<device::mojom::HidDeviceInfoPtr> result;
HidDelegate* delegate = GetContentClient()->browser()->GetHidDelegate();
for (auto& device : devices) {
if (delegate->HasDevicePermission(
WebContents::FromRenderFrameHost(render_frame_host()), origin(),
*device))
result.push_back(std::move(device));
}
std::move(callback).Run(std::move(result));
}
void HidService::FinishRequestDevice(
RequestDeviceCallback callback,
std::vector<device::mojom::HidDeviceInfoPtr> devices) {
std::move(callback).Run(std::move(devices));
}
void HidService::FinishConnect(
ConnectCallback callback,
mojo::PendingRemote<device::mojom::HidConnection> connection) {
if (!connection) {
std::move(callback).Run(mojo::NullRemote());
return;
}
std::move(callback).Run(std::move(connection));
}
} // namespace content
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