/*
 * Copyright (C) 2011 Ericsson AB. All rights reserved.
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of Ericsson nor the names of its contributors
 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "third_party/blink/renderer/modules/mediastream/user_media_request.h"

#include <type_traits>

#include "third_party/blink/public/mojom/feature_policy/feature_policy.mojom-blink.h"
#include "third_party/blink/renderer/bindings/core/v8/dictionary.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/dom_exception.h"
#include "third_party/blink/renderer/core/dom/space_split_string.h"
#include "third_party/blink/renderer/core/frame/deprecation.h"
#include "third_party/blink/renderer/core/frame/hosts_using_features.h"
#include "third_party/blink/renderer/core/origin_trials/origin_trials.h"
#include "third_party/blink/renderer/modules/mediastream/media_constraints_impl.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream_constraints.h"
#include "third_party/blink/renderer/modules/mediastream/media_track_constraints.h"
#include "third_party/blink/renderer/modules/mediastream/overconstrained_error.h"
#include "third_party/blink/renderer/modules/mediastream/user_media_controller.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_center.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_descriptor.h"

namespace blink {

namespace {

template <typename NumericConstraint>
bool SetUsesNumericConstraint(
    const WebMediaTrackConstraintSet& set,
    NumericConstraint WebMediaTrackConstraintSet::*field) {
  return (set.*field).HasExact() || (set.*field).HasIdeal() ||
         (set.*field).HasMin() || (set.*field).HasMax();
}

template <typename DiscreteConstraint>
bool SetUsesDiscreteConstraint(
    const WebMediaTrackConstraintSet& set,
    DiscreteConstraint WebMediaTrackConstraintSet::*field) {
  return (set.*field).HasExact() || (set.*field).HasIdeal();
}

template <typename NumericConstraint>
bool RequestUsesNumericConstraint(
    const WebMediaConstraints& constraints,
    NumericConstraint WebMediaTrackConstraintSet::*field) {
  if (SetUsesNumericConstraint(constraints.Basic(), field))
    return true;
  for (const auto& advanced_set : constraints.Advanced()) {
    if (SetUsesNumericConstraint(advanced_set, field))
      return true;
  }
  return false;
}

template <typename DiscreteConstraint>
bool RequestUsesDiscreteConstraint(
    const WebMediaConstraints& constraints,
    DiscreteConstraint WebMediaTrackConstraintSet::*field) {
  static_assert(
      std::is_same<decltype(field),
                   StringConstraint WebMediaTrackConstraintSet::*>::value ||
          std::is_same<decltype(field),
                       BooleanConstraint WebMediaTrackConstraintSet::*>::value,
      "Must use StringConstraint or BooleanConstraint");
  if (SetUsesDiscreteConstraint(constraints.Basic(), field))
    return true;
  for (const auto& advanced_set : constraints.Advanced()) {
    if (SetUsesDiscreteConstraint(advanced_set, field))
      return true;
  }
  return false;
}

class FeatureCounter {
  WTF_MAKE_NONCOPYABLE(FeatureCounter);

 public:
  explicit FeatureCounter(ExecutionContext* context)
      : context_(context), is_unconstrained_(true) {}
  void Count(WebFeature feature) {
    UseCounter::Count(context_, feature);
    is_unconstrained_ = false;
  }
  bool IsUnconstrained() { return is_unconstrained_; }

 private:
  Persistent<ExecutionContext> context_;
  bool is_unconstrained_;
};

void CountAudioConstraintUses(ExecutionContext* context,
                              const WebMediaConstraints& constraints) {
  FeatureCounter counter(context);
  if (RequestUsesNumericConstraint(constraints,
                                   &WebMediaTrackConstraintSet::sample_rate)) {
    counter.Count(WebFeature::kMediaStreamConstraintsSampleRate);
  }
  if (RequestUsesNumericConstraint(constraints,
                                   &WebMediaTrackConstraintSet::sample_size)) {
    counter.Count(WebFeature::kMediaStreamConstraintsSampleSize);
  }
  if (RequestUsesDiscreteConstraint(
          constraints, &WebMediaTrackConstraintSet::echo_cancellation)) {
    counter.Count(WebFeature::kMediaStreamConstraintsEchoCancellation);
  }
  if (RequestUsesNumericConstraint(constraints,
                                   &WebMediaTrackConstraintSet::latency)) {
    counter.Count(WebFeature::kMediaStreamConstraintsLatency);
  }
  if (RequestUsesNumericConstraint(
          constraints, &WebMediaTrackConstraintSet::channel_count)) {
    counter.Count(WebFeature::kMediaStreamConstraintsChannelCount);
  }
  if (RequestUsesDiscreteConstraint(constraints,
                                    &WebMediaTrackConstraintSet::device_id)) {
    counter.Count(WebFeature::kMediaStreamConstraintsDeviceIdAudio);
  }
  if (RequestUsesDiscreteConstraint(
          constraints, &WebMediaTrackConstraintSet::disable_local_echo)) {
    counter.Count(WebFeature::kMediaStreamConstraintsDisableLocalEcho);
  }
  if (RequestUsesDiscreteConstraint(constraints,
                                    &WebMediaTrackConstraintSet::group_id)) {
    counter.Count(WebFeature::kMediaStreamConstraintsGroupIdAudio);
  }
  if (RequestUsesDiscreteConstraint(
          constraints, &WebMediaTrackConstraintSet::media_stream_source)) {
    counter.Count(WebFeature::kMediaStreamConstraintsMediaStreamSourceAudio);
  }
  if (RequestUsesDiscreteConstraint(
          constraints,
          &WebMediaTrackConstraintSet::render_to_associated_sink)) {
    counter.Count(WebFeature::kMediaStreamConstraintsRenderToAssociatedSink);
  }
  if (RequestUsesDiscreteConstraint(
          constraints, &WebMediaTrackConstraintSet::hotword_enabled)) {
    counter.Count(WebFeature::kMediaStreamConstraintsHotwordEnabled);
  }
  if (RequestUsesDiscreteConstraint(
          constraints, &WebMediaTrackConstraintSet::goog_echo_cancellation)) {
    counter.Count(WebFeature::kMediaStreamConstraintsGoogEchoCancellation);
  }
  if (RequestUsesDiscreteConstraint(
          constraints,
          &WebMediaTrackConstraintSet::goog_experimental_echo_cancellation)) {
    counter.Count(
        WebFeature::kMediaStreamConstraintsGoogExperimentalEchoCancellation);
  }
  if (RequestUsesDiscreteConstraint(
          constraints, &WebMediaTrackConstraintSet::goog_auto_gain_control)) {
    counter.Count(WebFeature::kMediaStreamConstraintsGoogAutoGainControl);
  }
  if (RequestUsesDiscreteConstraint(
          constraints,
          &WebMediaTrackConstraintSet::goog_experimental_auto_gain_control)) {
    counter.Count(
        WebFeature::kMediaStreamConstraintsGoogExperimentalAutoGainControl);
  }
  if (RequestUsesDiscreteConstraint(
          constraints, &WebMediaTrackConstraintSet::goog_noise_suppression)) {
    counter.Count(WebFeature::kMediaStreamConstraintsGoogNoiseSuppression);
  }
  if (RequestUsesDiscreteConstraint(
          constraints, &WebMediaTrackConstraintSet::goog_highpass_filter)) {
    counter.Count(WebFeature::kMediaStreamConstraintsGoogHighpassFilter);
  }
  if (RequestUsesDiscreteConstraint(
          constraints,
          &WebMediaTrackConstraintSet::goog_typing_noise_detection)) {
    counter.Count(WebFeature::kMediaStreamConstraintsGoogTypingNoiseDetection);
  }
  if (RequestUsesDiscreteConstraint(
          constraints,
          &WebMediaTrackConstraintSet::goog_experimental_noise_suppression)) {
    counter.Count(
        WebFeature::kMediaStreamConstraintsGoogExperimentalNoiseSuppression);
  }
  if (RequestUsesDiscreteConstraint(
          constraints, &WebMediaTrackConstraintSet::goog_audio_mirroring)) {
    counter.Count(WebFeature::kMediaStreamConstraintsGoogAudioMirroring);
  }
  if (RequestUsesDiscreteConstraint(
          constraints,
          &WebMediaTrackConstraintSet::goog_da_echo_cancellation)) {
    counter.Count(WebFeature::kMediaStreamConstraintsGoogDAEchoCancellation);
  }

  UseCounter::Count(context, WebFeature::kMediaStreamConstraintsAudio);
  if (counter.IsUnconstrained()) {
    UseCounter::Count(context,
                      WebFeature::kMediaStreamConstraintsAudioUnconstrained);
  }
}

void CountVideoConstraintUses(ExecutionContext* context,
                              const WebMediaConstraints& constraints) {
  FeatureCounter counter(context);
  if (RequestUsesNumericConstraint(constraints,
                                   &WebMediaTrackConstraintSet::width)) {
    counter.Count(WebFeature::kMediaStreamConstraintsWidth);
  }
  if (RequestUsesNumericConstraint(constraints,
                                   &WebMediaTrackConstraintSet::height)) {
    counter.Count(WebFeature::kMediaStreamConstraintsHeight);
  }
  if (RequestUsesNumericConstraint(constraints,
                                   &WebMediaTrackConstraintSet::aspect_ratio)) {
    counter.Count(WebFeature::kMediaStreamConstraintsAspectRatio);
  }
  if (RequestUsesNumericConstraint(constraints,
                                   &WebMediaTrackConstraintSet::frame_rate)) {
    counter.Count(WebFeature::kMediaStreamConstraintsFrameRate);
  }
  if (RequestUsesDiscreteConstraint(constraints,
                                    &WebMediaTrackConstraintSet::facing_mode)) {
    counter.Count(WebFeature::kMediaStreamConstraintsFacingMode);
  }
  if (RequestUsesDiscreteConstraint(constraints,
                                    &WebMediaTrackConstraintSet::device_id)) {
    counter.Count(WebFeature::kMediaStreamConstraintsDeviceIdVideo);
  }
  if (RequestUsesDiscreteConstraint(constraints,
                                    &WebMediaTrackConstraintSet::group_id)) {
    counter.Count(WebFeature::kMediaStreamConstraintsGroupIdVideo);
  }
  if (RequestUsesDiscreteConstraint(constraints,
                                    &WebMediaTrackConstraintSet::video_kind)) {
    counter.Count(WebFeature::kMediaStreamConstraintsVideoKind);
  }
  if (RequestUsesNumericConstraint(constraints,
                                   &WebMediaTrackConstraintSet::depth_near)) {
    counter.Count(WebFeature::kMediaStreamConstraintsDepthNear);
  }
  if (RequestUsesNumericConstraint(constraints,
                                   &WebMediaTrackConstraintSet::depth_far)) {
    counter.Count(WebFeature::kMediaStreamConstraintsDepthFar);
  }
  if (RequestUsesNumericConstraint(
          constraints, &WebMediaTrackConstraintSet::focal_length_x)) {
    counter.Count(WebFeature::kMediaStreamConstraintsFocalLengthX);
  }
  if (RequestUsesNumericConstraint(
          constraints, &WebMediaTrackConstraintSet::focal_length_y)) {
    counter.Count(WebFeature::kMediaStreamConstraintsFocalLengthY);
  }
  if (RequestUsesDiscreteConstraint(
          constraints, &WebMediaTrackConstraintSet::media_stream_source)) {
    counter.Count(WebFeature::kMediaStreamConstraintsMediaStreamSourceVideo);
  }
  if (RequestUsesDiscreteConstraint(
          constraints, &WebMediaTrackConstraintSet::goog_noise_reduction)) {
    counter.Count(WebFeature::kMediaStreamConstraintsGoogNoiseReduction);
  }
  if (RequestUsesNumericConstraint(
          constraints,
          &WebMediaTrackConstraintSet::goog_power_line_frequency)) {
    counter.Count(WebFeature::kMediaStreamConstraintsGoogPowerLineFrequency);
  }

  UseCounter::Count(context, WebFeature::kMediaStreamConstraintsVideo);
  if (counter.IsUnconstrained()) {
    UseCounter::Count(context,
                      WebFeature::kMediaStreamConstraintsVideoUnconstrained);
  }
}

WebMediaConstraints ParseOptions(ExecutionContext* context,
                                 const BooleanOrMediaTrackConstraints& options,
                                 MediaErrorState& error_state) {
  WebMediaConstraints constraints;

  if (options.IsNull()) {
    // Do nothing.
  } else if (options.IsMediaTrackConstraints()) {
    constraints = MediaConstraintsImpl::Create(
        context, options.GetAsMediaTrackConstraints(), error_state);
  } else {
    DCHECK(options.IsBoolean());
    if (options.GetAsBoolean()) {
      constraints = MediaConstraintsImpl::Create();
    }
  }

  return constraints;
}

}  // namespace

class UserMediaRequest::V8Callbacks final : public UserMediaRequest::Callbacks {
 public:
  static V8Callbacks* Create(
      V8NavigatorUserMediaSuccessCallback* success_callback,
      V8NavigatorUserMediaErrorCallback* error_callback) {
    return new V8Callbacks(success_callback, error_callback);
  }

  ~V8Callbacks() override = default;

  void Trace(blink::Visitor* visitor) override {
    visitor->Trace(success_callback_);
    visitor->Trace(error_callback_);
    UserMediaRequest::Callbacks::Trace(visitor);
  }

  void OnSuccess(ScriptWrappable* callback_this_value,
                 MediaStream* stream) override {
    success_callback_->InvokeAndReportException(callback_this_value, stream);
  }
  void OnError(ScriptWrappable* callback_this_value,
               DOMExceptionOrOverconstrainedError error) override {
    error_callback_->InvokeAndReportException(callback_this_value, error);
  }

 private:
  V8Callbacks(V8NavigatorUserMediaSuccessCallback* success_callback,
              V8NavigatorUserMediaErrorCallback* error_callback)
      : success_callback_(ToV8PersistentCallbackFunction(success_callback)),
        error_callback_(ToV8PersistentCallbackFunction(error_callback)) {}

  // As Blink does not hold a UserMediaRequest and lets content/ hold it,
  // we cannot use wrapper-tracing to keep the underlying callback functions.
  // Plus, it's guaranteed that the callbacks are one-shot type (not repeated
  // type) and the owner UserMediaRequest will be discarded in a limited
  // timeframe. Thus these persistent handles are okay.
  Member<V8PersistentCallbackFunction<V8NavigatorUserMediaSuccessCallback>>
      success_callback_;
  Member<V8PersistentCallbackFunction<V8NavigatorUserMediaErrorCallback>>
      error_callback_;
};

UserMediaRequest* UserMediaRequest::Create(
    ExecutionContext* context,
    UserMediaController* controller,
    WebUserMediaRequest::MediaType media_type,
    const MediaStreamConstraints& options,
    Callbacks* callbacks,
    MediaErrorState& error_state) {
  WebMediaConstraints audio =
      ParseOptions(context, options.audio(), error_state);
  if (error_state.HadException())
    return nullptr;

  WebMediaConstraints video =
      ParseOptions(context, options.video(), error_state);
  if (error_state.HadException())
    return nullptr;

  if (media_type == WebUserMediaRequest::MediaType::kDisplayMedia) {
    // TODO(emircan): Support constraints after the spec change.
    // https://w3c.github.io/mediacapture-screen-share/#constraints
    // 5.2 Constraining Display Surface Selection
    // The getDisplayMedia function does not permit the use of constraints for
    // selection of a source as described in the getUserMedia() algorithm.
    // Prior to invoking the getUserMedia() algorithm, if either of the video
    // and audio attributes are set to a MediaTrackConstraints value (as
    // opposed to being absent or set to a Boolean value), reject the promise
    // with a InvalidAccessError and abort.
    if (options.audio().IsMediaTrackConstraints() ||
        options.video().IsMediaTrackConstraints()) {
      error_state.ThrowDOMException(
          DOMExceptionCode::kInvalidAccessError,
          "getDisplayMedia() does not permit the use of constraints.");
      return nullptr;
    }
    // TODO(emircan): Enable when audio capture is supported.
    if (!options.audio().IsNull() && options.audio().GetAsBoolean()) {
      error_state.ThrowTypeError("Audio is not supported");
      return nullptr;
    }
  }

  if (audio.IsNull() && video.IsNull()) {
    error_state.ThrowTypeError(
        "At least one of audio and video must be requested");
    return nullptr;
  }

  if (!audio.IsNull())
    CountAudioConstraintUses(context, audio);
  if (!video.IsNull())
    CountVideoConstraintUses(context, video);

  return new UserMediaRequest(context, controller, media_type, audio, video,
                              callbacks);
}

UserMediaRequest* UserMediaRequest::Create(
    ExecutionContext* context,
    UserMediaController* controller,
    const MediaStreamConstraints& options,
    V8NavigatorUserMediaSuccessCallback* success_callback,
    V8NavigatorUserMediaErrorCallback* error_callback,
    MediaErrorState& error_state) {
  return Create(context, controller, WebUserMediaRequest::MediaType::kUserMedia,
                options, V8Callbacks::Create(success_callback, error_callback),
                error_state);
}

UserMediaRequest* UserMediaRequest::CreateForTesting(
    const WebMediaConstraints& audio,
    const WebMediaConstraints& video) {
  return new UserMediaRequest(nullptr, nullptr,
                              WebUserMediaRequest::MediaType::kUserMedia, audio,
                              video, nullptr);
}

UserMediaRequest::UserMediaRequest(ExecutionContext* context,
                                   UserMediaController* controller,
                                   WebUserMediaRequest::MediaType media_type,
                                   WebMediaConstraints audio,
                                   WebMediaConstraints video,
                                   Callbacks* callbacks)
    : ContextLifecycleObserver(context),
      media_type_(media_type),
      audio_(audio),
      video_(video),
      should_disable_hardware_noise_suppression_(
          OriginTrials::DisableHardwareNoiseSuppressionEnabled(context)),
      controller_(controller),
      callbacks_(callbacks) {
  if (should_disable_hardware_noise_suppression_) {
    UseCounter::Count(context,
                      WebFeature::kUserMediaDisableHardwareNoiseSuppression);
  }
  if (OriginTrials::ExperimentalHardwareEchoCancellationEnabled(context)) {
    UseCounter::Count(
        context,
        WebFeature::kUserMediaEnableExperimentalHardwareEchoCancellation);
  }
}

UserMediaRequest::~UserMediaRequest() = default;

WebUserMediaRequest::MediaType UserMediaRequest::MediaRequestType() const {
  return media_type_;
}

bool UserMediaRequest::Audio() const {
  return !audio_.IsNull();
}

bool UserMediaRequest::Video() const {
  return !video_.IsNull();
}

WebMediaConstraints UserMediaRequest::AudioConstraints() const {
  return audio_;
}

WebMediaConstraints UserMediaRequest::VideoConstraints() const {
  return video_;
}

bool UserMediaRequest::ShouldDisableHardwareNoiseSuppression() const {
  return should_disable_hardware_noise_suppression_;
}

bool UserMediaRequest::IsSecureContextUse(String& error_message) {
  Document* document = OwnerDocument();

  if (document->IsSecureContext(error_message)) {
    UseCounter::Count(document->GetFrame(),
                      WebFeature::kGetUserMediaSecureOrigin);
    UseCounter::CountCrossOriginIframe(
        *document, WebFeature::kGetUserMediaSecureOriginIframe);

    // Feature policy deprecation messages.
    if (Audio()) {
      if (!document->GetFrame()->IsFeatureEnabled(
              mojom::FeaturePolicyFeature::kMicrophone,
              ReportOptions::kReportOnFailure)) {
        UseCounter::Count(
            document, WebFeature::kMicrophoneDisabledByFeaturePolicyEstimate);
      }
    }
    if (Video()) {
      if (!document->GetFrame()->IsFeatureEnabled(
              mojom::FeaturePolicyFeature::kCamera,
              ReportOptions::kReportOnFailure)) {
        UseCounter::Count(document,
                          WebFeature::kCameraDisabledByFeaturePolicyEstimate);
      }
    }

    HostsUsingFeatures::CountAnyWorld(
        *document, HostsUsingFeatures::Feature::kGetUserMediaSecureHost);
    return true;
  }

  // While getUserMedia is blocked on insecure origins, we still want to
  // count attempts to use it.
  Deprecation::CountDeprecation(document->GetFrame(),
                                WebFeature::kGetUserMediaInsecureOrigin);
  Deprecation::CountDeprecationCrossOriginIframe(
      *document, WebFeature::kGetUserMediaInsecureOriginIframe);
  HostsUsingFeatures::CountAnyWorld(
      *document, HostsUsingFeatures::Feature::kGetUserMediaInsecureHost);
  return false;
}

Document* UserMediaRequest::OwnerDocument() {
  if (ExecutionContext* context = GetExecutionContext()) {
    return ToDocument(context);
  }

  return nullptr;
}

void UserMediaRequest::Start() {
  if (controller_)
    controller_->RequestUserMedia(this);
}

void UserMediaRequest::Succeed(MediaStreamDescriptor* stream_descriptor) {
  if (!GetExecutionContext())
    return;

  MediaStream* stream =
      MediaStream::Create(GetExecutionContext(), stream_descriptor);

  MediaStreamTrackVector audio_tracks = stream->getAudioTracks();
  for (MediaStreamTrackVector::iterator iter = audio_tracks.begin();
       iter != audio_tracks.end(); ++iter) {
    (*iter)->SetConstraints(audio_);
  }

  MediaStreamTrackVector video_tracks = stream->getVideoTracks();
  for (MediaStreamTrackVector::iterator iter = video_tracks.begin();
       iter != video_tracks.end(); ++iter) {
    (*iter)->SetConstraints(video_);
  }

  callbacks_->OnSuccess(nullptr, stream);
}

void UserMediaRequest::FailConstraint(const String& constraint_name,
                                      const String& message) {
  DCHECK(!constraint_name.IsEmpty());
  if (!GetExecutionContext())
    return;
  callbacks_->OnError(
      nullptr, DOMExceptionOrOverconstrainedError::FromOverconstrainedError(
                   OverconstrainedError::Create(constraint_name, message)));
}

void UserMediaRequest::Fail(WebUserMediaRequest::Error name,
                            const String& message) {
  if (!GetExecutionContext())
    return;

  DOMExceptionCode exception_code = DOMExceptionCode::kNotSupportedError;
  switch (name) {
    case WebUserMediaRequest::Error::kPermissionDenied:
    case WebUserMediaRequest::Error::kPermissionDismissed:
    case WebUserMediaRequest::Error::kInvalidState:
    case WebUserMediaRequest::Error::kFailedDueToShutdown:
    case WebUserMediaRequest::Error::kKillSwitchOn:
      exception_code = DOMExceptionCode::kNotAllowedError;
      break;
    case WebUserMediaRequest::Error::kDevicesNotFound:
      exception_code = DOMExceptionCode::kNotFoundError;
      break;
    case WebUserMediaRequest::Error::kTabCapture:
    case WebUserMediaRequest::Error::kScreenCapture:
    case WebUserMediaRequest::Error::kCapture:
      exception_code = DOMExceptionCode::kAbortError;
      break;
    case WebUserMediaRequest::Error::kTrackStart:
      exception_code = DOMExceptionCode::kNotReadableError;
      break;
    case WebUserMediaRequest::Error::kNotSupported:
      exception_code = DOMExceptionCode::kNotSupportedError;
      break;
    case WebUserMediaRequest::Error::kSecurityError:
      exception_code = DOMExceptionCode::kSecurityError;
      break;
    default:
      NOTREACHED();
  }
  callbacks_->OnError(nullptr,
                      DOMExceptionOrOverconstrainedError::FromDOMException(
                          DOMException::Create(exception_code, message)));
}

void UserMediaRequest::ContextDestroyed(ExecutionContext*) {
  if (controller_) {
    controller_->CancelUserMediaRequest(this);
    controller_ = nullptr;
  }
}

void UserMediaRequest::Trace(blink::Visitor* visitor) {
  visitor->Trace(controller_);
  visitor->Trace(callbacks_);
  ContextLifecycleObserver::Trace(visitor);
}

}  // namespace blink