Quelle nsDeviceSensors.cpp Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/Hal.h"
#include "mozilla/HalSensor.h"

#include "nsContentUtils.h"
#include "nsDeviceSensors.h"

#include "nsGlobalWindowInner.h"
#include "nsPIDOMWindow.h"
#include "nsIScriptObjectPrincipal.h"
#include "mozilla/Preferences.h"
#include "mozilla/StaticPrefs_device.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/BrowsingContext.h"
#include "mozilla/dom/DeviceLightEvent.h"
#include "mozilla/dom/DeviceOrientationEvent.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/UserProximityEvent.h"
#include "mozilla/ErrorResult.h"

#include <cmath>

using namespace mozilla;
using namespace mozilla::dom;
using namespace hal;

class nsIDOMWindow;

#undef near

#define DEFAULT_SENSOR_POLL 100

static const nsTArray<nsIDOMWindow*>::index_type NoIndex =
    nsTArray<nsIDOMWindow*>::NoIndex;

class nsDeviceSensorData final : public nsIDeviceSensorData {
public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIDEVICESENSORDATA

  nsDeviceSensorData(unsigned long type, double x, double y, double z);

private:
  ~nsDeviceSensorData();

protected:
  unsigned long mType;
  double mX, mY, mZ;
};

nsDeviceSensorData::nsDeviceSensorData(unsigned long type, double x, double y,
                                       double z)
    : mType(type), mX(x), mY(y), mZ(z) {}

NS_INTERFACE_MAP_BEGIN(nsDeviceSensorData)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDeviceSensorData)
NS_INTERFACE_MAP_END

NS_IMPL_ADDREF(nsDeviceSensorData)
NS_IMPL_RELEASE(nsDeviceSensorData)

nsDeviceSensorData::~nsDeviceSensorData() = default;

NS_IMETHODIMP nsDeviceSensorData::GetType(uint32_t* aType) {
  NS_ENSURE_ARG_POINTER(aType);
  *aType = mType;
  return NS_OK;
}

NS_IMETHODIMP nsDeviceSensorData::GetX(double* aX) {
  NS_ENSURE_ARG_POINTER(aX);
  *aX = mX;
  return NS_OK;
}

NS_IMETHODIMP nsDeviceSensorData::GetY(double* aY) {
  NS_ENSURE_ARG_POINTER(aY);
  *aY = mY;
  return NS_OK;
}

NS_IMETHODIMP nsDeviceSensorData::GetZ(double* aZ) {
  NS_ENSURE_ARG_POINTER(aZ);
  *aZ = mZ;
  return NS_OK;
}

NS_IMPL_ISUPPORTS(nsDeviceSensors, nsIDeviceSensors)

nsDeviceSensors::nsDeviceSensors() {
  mIsUserProximityNear = false;
  mLastDOMMotionEventTime = TimeStamp::Now();

  for (int i = 0; i < NUM_SENSOR_TYPE; i++) {
    nsTArray<nsIDOMWindow*>* windows = new nsTArray<nsIDOMWindow*>();
    mWindowListeners.AppendElement(windows);
  }

  mLastDOMMotionEventTime = TimeStamp::Now();
}

nsDeviceSensors::~nsDeviceSensors() {
  for (int i = 0; i < NUM_SENSOR_TYPE; i++) {
    if (IsSensorEnabled(i)) UnregisterSensorObserver((SensorType)i, this);
  }

  for (int i = 0; i < NUM_SENSOR_TYPE; i++) {
    delete mWindowListeners[i];
  }
}

NS_IMETHODIMP nsDeviceSensors::HasWindowListener(uint32_t aType,
                                                 nsIDOMWindow* aWindow,
                                                 bool* aRetVal) {
  if (!IsSensorAllowedByPref(aType, aWindow))
    *aRetVal = false;
  else
    *aRetVal = mWindowListeners[aType]->IndexOf(aWindow) != NoIndex;

  return NS_OK;
}

class DeviceSensorTestEvent : public Runnable {
public:
  DeviceSensorTestEvent(nsDeviceSensors* aTarget, uint32_t aType)
      : mozilla::Runnable("DeviceSensorTestEvent"),
        mTarget(aTarget),
        mType(aType) {}

  NS_IMETHOD Run() override {
    SensorData sensorData;
    sensorData.sensor() = static_cast<SensorType>(mType);
    sensorData.timestamp() = PR_Now();
    sensorData.values().AppendElement(0.5f);
    sensorData.values().AppendElement(0.5f);
    sensorData.values().AppendElement(0.5f);
    sensorData.values().AppendElement(0.5f);
    mTarget->Notify(sensorData);
    return NS_OK;
  }

private:
  RefPtr<nsDeviceSensors> mTarget;
  uint32_t mType;
};

NS_IMETHODIMP nsDeviceSensors::AddWindowListener(uint32_t aType,
                                                 nsIDOMWindow* aWindow) {
  if (!IsSensorAllowedByPref(aType, aWindow)) return NS_OK;

  if (mWindowListeners[aType]->IndexOf(aWindow) != NoIndex) return NS_OK;

  if (!IsSensorEnabled(aType)) {
    RegisterSensorObserver((SensorType)aType, this);
  }

  mWindowListeners[aType]->AppendElement(aWindow);

  if (StaticPrefs::device_sensors_test_events()) {
    nsCOMPtr<nsIRunnable> event = new DeviceSensorTestEvent(this, aType);
    NS_DispatchToCurrentThread(event);
  }

  return NS_OK;
}

NS_IMETHODIMP nsDeviceSensors::RemoveWindowListener(uint32_t aType,
                                                    nsIDOMWindow* aWindow) {
  if (mWindowListeners[aType]->IndexOf(aWindow) == NoIndex) return NS_OK;

  mWindowListeners[aType]->RemoveElement(aWindow);

  if (mWindowListeners[aType]->Length() == 0)
    UnregisterSensorObserver((SensorType)aType, this);

  return NS_OK;
}

NS_IMETHODIMP nsDeviceSensors::RemoveWindowAsListener(nsIDOMWindow* aWindow) {
  for (int i = 0; i < NUM_SENSOR_TYPE; i++) {
    RemoveWindowListener((SensorType)i, aWindow);
  }
  return NS_OK;
}

static bool WindowCannotReceiveSensorEvent(nsPIDOMWindowInner* aWindow) {
  // Check to see if this window is in the background.
  if (!aWindow || !aWindow->IsCurrentInnerWindow()) {
    return true;
  }

  nsPIDOMWindowOuter* windowOuter = aWindow->GetOuterWindow();
  BrowsingContext* topBC = aWindow->GetBrowsingContext()->Top();
  if (windowOuter->IsBackground() || !topBC->GetIsActiveBrowserWindow()) {
    nsGlobalWindowInner* win = nsGlobalWindowInner::Cast(aWindow);
    nsIPrincipal* principal = win->GetPrincipal();
    if (principal &&
        principal->Equals(
            nsContentUtils::GetFingerprintingProtectionPrincipal())) {
      return false;
    }
    return true;
  }

  // Check to see if this window is a cross-origin iframe:
  if (!topBC->IsInProcess()) {
    return true;
  }

  nsCOMPtr<nsIScriptObjectPrincipal> sop = do_QueryInterface(aWindow);
  nsCOMPtr<nsIScriptObjectPrincipal> topSop =
      do_QueryInterface(topBC->GetDOMWindow());
  if (!sop || !topSop) {
    return true;
  }

  nsIPrincipal* principal = sop->GetPrincipal();
  nsIPrincipal* topPrincipal = topSop->GetPrincipal();
  if (!principal || !topPrincipal) {
    return true;
  }

  return !principal->Subsumes(topPrincipal);
}

// Holds the device orientation in Euler angle degrees (azimuth, pitch, roll).
struct Orientation {
  enum OrientationReference { kRelative = 0, kAbsolute };

  static Orientation RadToDeg(const Orientation& aOrient) {
    const static double kRadToDeg = 180.0 / M_PI;
    return {aOrient.alpha * kRadToDeg, aOrient.beta * kRadToDeg,
            aOrient.gamma * kRadToDeg};
  }

  double alpha;
  double beta;
  double gamma;
};

static Orientation RotationVectorToOrientation(double aX, double aY, double aZ,
                                               double aW) {
  double mat[9];

  mat[0] = 1 - 2 * aY * aY - 2 * aZ * aZ;
  mat[1] = 2 * aX * aY - 2 * aZ * aW;
  mat[2] = 2 * aX * aZ + 2 * aY * aW;

  mat[3] = 2 * aX * aY + 2 * aZ * aW;
  mat[4] = 1 - 2 * aX * aX - 2 * aZ * aZ;
  mat[5] = 2 * aY * aZ - 2 * aX * aW;

  mat[6] = 2 * aX * aZ - 2 * aY * aW;
  mat[7] = 2 * aY * aZ + 2 * aX * aW;
  mat[8] = 1 - 2 * aX * aX - 2 * aY * aY;

  Orientation orient;

  if (mat[8] > 0) {
    orient.alpha = atan2(-mat[1], mat[4]);
    orient.beta = asin(mat[7]);
    orient.gamma = atan2(-mat[6], mat[8]);
  } else if (mat[8] < 0) {
    orient.alpha = atan2(mat[1], -mat[4]);
    orient.beta = -asin(mat[7]);
    orient.beta += (orient.beta >= 0) ? -M_PI : M_PI;
    orient.gamma = atan2(mat[6], -mat[8]);
  } else {
    if (mat[6] > 0) {
      orient.alpha = atan2(-mat[1], mat[4]);
      orient.beta = asin(mat[7]);
      orient.gamma = -M_PI_2;
    } else if (mat[6] < 0) {
      orient.alpha = atan2(mat[1], -mat[4]);
      orient.beta = -asin(mat[7]);
      orient.beta += (orient.beta >= 0) ? -M_PI : M_PI;
      orient.gamma = -M_PI_2;
    } else {
      orient.alpha = atan2(mat[3], mat[0]);
      orient.beta = (mat[7] > 0) ? M_PI_2 : -M_PI_2;
      orient.gamma = 0;
    }
  }

  if (orient.alpha < 0) {
    orient.alpha += 2 * M_PI;
  }

  return Orientation::RadToDeg(orient);
}

void nsDeviceSensors::Notify(const mozilla::hal::SensorData& aSensorData) {
  uint32_t type = aSensorData.sensor();

  const nsTArray<float>& values = aSensorData.values();
  size_t len = values.Length();
  double x = len > 0 ? values[0] : 0.0;
  double y = len > 1 ? values[1] : 0.0;
  double z = len > 2 ? values[2] : 0.0;
  double w = len > 3 ? values[3] : 0.0;
  PRTime timestamp = aSensorData.timestamp();

  nsCOMArray<nsIDOMWindow> windowListeners;
  for (uint32_t i = 0; i < mWindowListeners[type]->Length(); i++) {
    windowListeners.AppendObject(mWindowListeners[type]->SafeElementAt(i));
  }

  for (uint32_t i = windowListeners.Count(); i > 0;) {
    --i;

    nsCOMPtr<nsPIDOMWindowInner> pwindow =
        do_QueryInterface(windowListeners[i]);
    if (WindowCannotReceiveSensorEvent(pwindow)) {
      continue;
    }

    if (nsCOMPtr<Document> doc = pwindow->GetDoc()) {
      nsCOMPtr<mozilla::dom::EventTarget> target =
          do_QueryInterface(windowListeners[i]);
      if (type == nsIDeviceSensorData::TYPE_ACCELERATION ||
          type == nsIDeviceSensorData::TYPE_LINEAR_ACCELERATION ||
          type == nsIDeviceSensorData::TYPE_GYROSCOPE) {
        FireDOMMotionEvent(doc, target, type, timestamp, x, y, z);
      } else if (type == nsIDeviceSensorData::TYPE_ORIENTATION) {
        FireDOMOrientationEvent(target, x, y, z, Orientation::kAbsolute);
      } else if (type == nsIDeviceSensorData::TYPE_ROTATION_VECTOR) {
        const Orientation orient = RotationVectorToOrientation(x, y, z, w);
        FireDOMOrientationEvent(target, orient.alpha, orient.beta, orient.gamma,
                                Orientation::kAbsolute);
      } else if (type == nsIDeviceSensorData::TYPE_GAME_ROTATION_VECTOR) {
        const Orientation orient = RotationVectorToOrientation(x, y, z, w);
        FireDOMOrientationEvent(target, orient.alpha, orient.beta, orient.gamma,
                                Orientation::kRelative);
      } else if (type == nsIDeviceSensorData::TYPE_PROXIMITY) {
        MaybeFireDOMUserProximityEvent(target, x, z);
      } else if (type == nsIDeviceSensorData::TYPE_LIGHT) {
        FireDOMLightEvent(target, x);
      }
    }
  }
}

void nsDeviceSensors::FireDOMLightEvent(mozilla::dom::EventTarget* aTarget,
                                        double aValue) {
  DeviceLightEventInit init;
  init.mBubbles = true;
  init.mCancelable = false;
  init.mValue = round(aValue);
  RefPtr<DeviceLightEvent> event =
      DeviceLightEvent::Constructor(aTarget, u"devicelight"_ns, init);

  event->SetTrusted(true);

  aTarget->DispatchEvent(*event);
}

void nsDeviceSensors::MaybeFireDOMUserProximityEvent(
    mozilla::dom::EventTarget* aTarget, double aValue, double aMax) {
  bool near = (aValue < aMax);
  if (mIsUserProximityNear != near) {
    mIsUserProximityNear = near;
    FireDOMUserProximityEvent(aTarget, mIsUserProximityNear);
  }
}

void nsDeviceSensors::FireDOMUserProximityEvent(
    mozilla::dom::EventTarget* aTarget, bool aNear) {
  UserProximityEventInit init;
  init.mBubbles = true;
  init.mCancelable = false;
  init.mNear = aNear;
  RefPtr<UserProximityEvent> event =
      UserProximityEvent::Constructor(aTarget, u"userproximity"_ns, init);

  event->SetTrusted(true);

  aTarget->DispatchEvent(*event);
}

void nsDeviceSensors::FireDOMOrientationEvent(EventTarget* aTarget,
                                              double aAlpha, double aBeta,
                                              double aGamma, bool aIsAbsolute) {
  DeviceOrientationEventInit init;
  init.mBubbles = true;
  init.mCancelable = false;
  init.mAlpha.SetValue(aAlpha);
  init.mBeta.SetValue(aBeta);
  init.mGamma.SetValue(aGamma);
  init.mAbsolute = aIsAbsolute;

  auto Dispatch = [&](EventTarget* aEventTarget, const nsAString& aType) {
    RefPtr<DeviceOrientationEvent> event =
        DeviceOrientationEvent::Constructor(aEventTarget, aType, init);
    event->SetTrusted(true);
    aEventTarget->DispatchEvent(*event);
  };

  Dispatch(aTarget, aIsAbsolute ? u"deviceorientationabsolute"_ns
                                : u"deviceorientation"_ns);

  // This is used to determine whether relative events have been dispatched
  // during the current session, in which case we don't dispatch the additional
  // compatibility events.
  static bool sIsDispatchingRelativeEvents = false;
  sIsDispatchingRelativeEvents = sIsDispatchingRelativeEvents || !aIsAbsolute;

  // Android devices with SENSOR_GAME_ROTATION_VECTOR support dispatch
  // relative events for "deviceorientation" by default, while other platforms
  // and devices without such support dispatch absolute events by default.
  if (aIsAbsolute && !sIsDispatchingRelativeEvents) {
    // For absolute events on devices without support for relative events,
    // we need to additionally dispatch type "deviceorientation" to keep
    // backwards-compatibility.
    Dispatch(aTarget, u"deviceorientation"_ns);
  }
}

void nsDeviceSensors::FireDOMMotionEvent(Document* doc, EventTarget* target,
                                         uint32_t type, PRTime timestamp,
                                         double x, double y, double z) {
  // Attempt to coalesce events
  TimeDuration sensorPollDuration =
      TimeDuration::FromMilliseconds(DEFAULT_SENSOR_POLL);
  bool fireEvent =
      (TimeStamp::Now() > mLastDOMMotionEventTime + sensorPollDuration) ||
      StaticPrefs::device_sensors_test_events();

  switch (type) {
    case nsIDeviceSensorData::TYPE_LINEAR_ACCELERATION:
      if (!mLastAcceleration) {
        mLastAcceleration.emplace();
      }
      mLastAcceleration->mX.SetValue(x);
      mLastAcceleration->mY.SetValue(y);
      mLastAcceleration->mZ.SetValue(z);
      break;
    case nsIDeviceSensorData::TYPE_ACCELERATION:
      if (!mLastAccelerationIncludingGravity) {
        mLastAccelerationIncludingGravity.emplace();
      }
      mLastAccelerationIncludingGravity->mX.SetValue(x);
      mLastAccelerationIncludingGravity->mY.SetValue(y);
      mLastAccelerationIncludingGravity->mZ.SetValue(z);
      break;
    case nsIDeviceSensorData::TYPE_GYROSCOPE:
      if (!mLastRotationRate) {
        mLastRotationRate.emplace();
      }
      mLastRotationRate->mAlpha.SetValue(x);
      mLastRotationRate->mBeta.SetValue(y);
      mLastRotationRate->mGamma.SetValue(z);
      break;
  }

  if (fireEvent) {
    if (!mLastAcceleration) {
      mLastAcceleration.emplace();
    }
    if (!mLastAccelerationIncludingGravity) {
      mLastAccelerationIncludingGravity.emplace();
    }
    if (!mLastRotationRate) {
      mLastRotationRate.emplace();
    }
  } else if (!mLastAcceleration || !mLastAccelerationIncludingGravity ||
             !mLastRotationRate) {
    return;
  }

  IgnoredErrorResult ignored;
  RefPtr<Event> event =
      doc->CreateEvent(u"DeviceMotionEvent"_ns, CallerType::System, ignored);
  if (!event) {
    return;
  }

  DeviceMotionEvent* me = static_cast<DeviceMotionEvent*>(event.get());

  me->InitDeviceMotionEvent(
      u"devicemotion"_ns, true, false, *mLastAcceleration,
      *mLastAccelerationIncludingGravity, *mLastRotationRate,
      Nullable<double>(DEFAULT_SENSOR_POLL), Nullable<uint64_t>(timestamp));

  event->SetTrusted(true);

  target->DispatchEvent(*event);

  mLastRotationRate.reset();
  mLastAccelerationIncludingGravity.reset();
  mLastAcceleration.reset();
  mLastDOMMotionEventTime = TimeStamp::Now();
}

bool nsDeviceSensors::IsSensorAllowedByPref(uint32_t aType,
                                            nsIDOMWindow* aWindow) {
  // checks "device.sensors.enabled" master pref
  if (!StaticPrefs::device_sensors_enabled()) {
    return false;
  }

  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(aWindow);
  nsCOMPtr<Document> doc;
  if (window) {
    doc = window->GetExtantDoc();
  }

  switch (aType) {
    case nsIDeviceSensorData::TYPE_LINEAR_ACCELERATION:
    case nsIDeviceSensorData::TYPE_ACCELERATION:
    case nsIDeviceSensorData::TYPE_GYROSCOPE:
      // checks "device.sensors.motion.enabled" pref
      if (!StaticPrefs::device_sensors_motion_enabled()) {
        return false;
      }
      if (doc) {
        doc->WarnOnceAbout(DeprecatedOperations::eMotionEvent);
      }
      break;
    case nsIDeviceSensorData::TYPE_GAME_ROTATION_VECTOR:
    case nsIDeviceSensorData::TYPE_ORIENTATION:
    case nsIDeviceSensorData::TYPE_ROTATION_VECTOR:
      // checks "device.sensors.orientation.enabled" pref
      if (!StaticPrefs::device_sensors_orientation_enabled()) {
        return false;
      }
      if (doc) {
        doc->WarnOnceAbout(DeprecatedOperations::eOrientationEvent);
      }
      break;
    case nsIDeviceSensorData::TYPE_PROXIMITY:
      // checks "device.sensors.proximity.enabled" pref
      if (!StaticPrefs::device_sensors_proximity_enabled()) {
        return false;
      }
      if (doc) {
        doc->WarnOnceAbout(DeprecatedOperations::eProximityEvent, true);
      }
      break;
    case nsIDeviceSensorData::TYPE_LIGHT:
      // checks "device.sensors.ambientLight.enabled" pref
      if (!StaticPrefs::device_sensors_ambientLight_enabled()) {
        return false;
      }
      if (doc) {
        doc->WarnOnceAbout(DeprecatedOperations::eAmbientLightEvent, true);
      }
      break;
    default:
      MOZ_ASSERT_UNREACHABLE("Device sensor type not recognised");
      return false;
  }

  if (!window) {
    return true;
  }
  return !nsGlobalWindowInner::Cast(window)->ShouldResistFingerprinting(
      RFPTarget::DeviceSensors);
}

quality96%

¤ Dauer der Verarbeitung: 0.17 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.