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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 "third_party/blink/renderer/modules/nfc/nfc_proxy.h"
#include <utility>
#include "third_party/blink/public/common/browser_interface_broker_proxy.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/page/page.h"
#include "third_party/blink/renderer/modules/nfc/ndef_reader.h"
#include "third_party/blink/renderer/modules/nfc/ndef_writer.h"
#include "third_party/blink/renderer/modules/nfc/nfc_type_converters.h"
#include "third_party/blink/renderer/modules/nfc/nfc_utils.h"
#include "third_party/blink/renderer/platform/mojo/mojo_helper.h"
namespace blink {
// static
const char NFCProxy::kSupplementName[] = "NFCProxy";
// static
NFCProxy* NFCProxy::From(LocalDOMWindow& window) {
// https://w3c.github.io/web-nfc/#security-policies
// WebNFC API must be only accessible from top level browsing context.
DCHECK(window.GetFrame()->IsMainFrame());
NFCProxy* nfc_proxy = Supplement<LocalDOMWindow>::From<NFCProxy>(window);
if (!nfc_proxy) {
nfc_proxy = MakeGarbageCollected<NFCProxy>(window);
Supplement<LocalDOMWindow>::ProvideTo(window, nfc_proxy);
}
return nfc_proxy;
}
// NFCProxy
NFCProxy::NFCProxy(LocalDOMWindow& window)
: Supplement<LocalDOMWindow>(window), client_receiver_(this) {}
NFCProxy::~NFCProxy() = default;
void NFCProxy::Dispose() {
client_receiver_.reset();
}
void NFCProxy::Trace(Visitor* visitor) {
visitor->Trace(writers_);
visitor->Trace(readers_);
Supplement<LocalDOMWindow>::Trace(visitor);
}
void NFCProxy::StartReading(NDEFReader* reader,
const NDEFScanOptions* options,
device::mojom::blink::NFC::WatchCallback callback) {
DCHECK(reader);
DCHECK(!readers_.Contains(reader));
EnsureMojoConnection();
nfc_remote_->Watch(
device::mojom::blink::NDEFScanOptions::From(options), next_watch_id_,
WTF::Bind(&NFCProxy::OnReaderRegistered, WrapPersistent(this),
WrapPersistent(reader), next_watch_id_, std::move(callback)));
readers_.insert(reader, next_watch_id_);
next_watch_id_++;
}
void NFCProxy::StopReading(NDEFReader* reader) {
DCHECK(reader);
auto iter = readers_.find(reader);
if (iter != readers_.end()) {
if (nfc_remote_) {
// We do not need to notify |reader| of anything.
nfc_remote_->CancelWatch(
iter->value, device::mojom::blink::NFC::CancelWatchCallback());
}
readers_.erase(iter);
}
}
bool NFCProxy::IsReading(const NDEFReader* reader) {
DCHECK(reader);
return readers_.Contains(const_cast<NDEFReader*>(reader));
}
void NFCProxy::AddWriter(NDEFWriter* writer) {
DCHECK(!writers_.Contains(writer));
writers_.insert(writer);
}
void NFCProxy::Push(device::mojom::blink::NDEFMessagePtr message,
device::mojom::blink::NDEFWriteOptionsPtr options,
device::mojom::blink::NFC::PushCallback cb) {
EnsureMojoConnection();
nfc_remote_->Push(std::move(message), std::move(options), std::move(cb));
}
void NFCProxy::CancelPush(
device::mojom::blink::NFC::CancelPushCallback callback) {
DCHECK(nfc_remote_);
nfc_remote_->CancelPush(std::move(callback));
}
// device::mojom::blink::NFCClient implementation.
void NFCProxy::OnWatch(const Vector<uint32_t>& watch_ids,
const String& serial_number,
device::mojom::blink::NDEFMessagePtr message) {
// Dispatch the event to all matched readers. We iterate on a copy of
// |readers_| because a reader's onreading event handler may remove itself
// from |readers_| just during the iteration process. This loop is O(n^2),
// however, we assume the number of readers to be small so it'd be just OK.
ReaderMap copy = readers_;
for (auto& pair : copy) {
if (watch_ids.Contains(pair.value))
pair.key->OnReading(serial_number, *message);
}
}
void NFCProxy::OnError(device::mojom::blink::NDEFErrorPtr error) {
// Dispatch the event to all readers. We iterate on a copy of |readers_|
// because a reader's onerror event handler may remove itself from |readers_|
// just during the iteration process.
ReaderMap copy = readers_;
for (auto& pair : copy) {
pair.key->OnError(error->error_message);
}
}
void NFCProxy::OnReaderRegistered(
NDEFReader* reader,
uint32_t watch_id,
device::mojom::blink::NFC::WatchCallback callback,
device::mojom::blink::NDEFErrorPtr error) {
DCHECK(reader);
// |reader| may have already stopped reading.
if (!readers_.Contains(reader))
return;
// |reader| already stopped reading for the previous |watch_id| request and
// started a new one, let's just ignore this response callback as we do not
// need to notify |reader| of anything for an obsoleted session.
if (readers_.at(reader) != watch_id)
return;
if (error) {
readers_.erase(reader);
std::move(callback).Run(std::move(error));
return;
}
std::move(callback).Run(nullptr);
// It's good the watch request has been accepted, next we just wait for
// message notifications in OnWatch().
}
void NFCProxy::EnsureMojoConnection() {
if (nfc_remote_)
return;
// See https://bit.ly/2S0zRAS for task types.
auto task_runner =
GetSupplementable()->GetTaskRunner(TaskType::kMiscPlatformAPI);
GetSupplementable()->GetBrowserInterfaceBroker().GetInterface(
nfc_remote_.BindNewPipeAndPassReceiver(task_runner));
nfc_remote_.set_disconnect_handler(
WTF::Bind(&NFCProxy::OnMojoConnectionError, WrapWeakPersistent(this)));
// Set client for OnWatch event.
nfc_remote_->SetClient(
client_receiver_.BindNewPipeAndPassRemote(task_runner));
}
// This method will be called if either the NFC service is unavailable (such
// as if the feature flag is disabled) or when the user revokes the NFC
// permission after the Mojo connection has already been opened. It is
// currently impossible to distinguish between these two cases.
//
// In the future this code may also handle the case where an out-of-process
// Device Service encounters a fatal error and must be restarted.
void NFCProxy::OnMojoConnectionError() {
nfc_remote_.reset();
client_receiver_.reset();
// Notify all active readers about the connection error and clear the list.
ReaderMap readers = std::move(readers_);
for (auto& pair : readers) {
pair.key->OnMojoConnectionError();
}
// Each connection maintains its own watch ID numbering, so reset to 1 on
// connection error.
next_watch_id_ = 1;
// Notify all writers about the connection error.
for (auto& writer : writers_) {
writer->OnMojoConnectionError();
}
// Clear the reader list.
writers_.clear();
}
} // namespace blink
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