10 files changed, 444 insertions, 0 deletions
diff --git a/dom/battery/BatteryManager.cpp b/dom/battery/BatteryManager.cpp
new file mode 100644
index 0000000000..0a56f12af1
--- /dev/null
+++ b/dom/battery/BatteryManager.cpp
@@ -0,0 +1,183 @@
+/* -*- 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 <cmath>
+#include <limits>
+#include "BatteryManager.h"
+#include "Constants.h"
+#include "mozilla/DOMEventTargetHelper.h"
+#include "mozilla/Hal.h"
+#include "mozilla/dom/BatteryManagerBinding.h"
+#include "mozilla/Preferences.h"
+#include "nsContentUtils.h"
+#include "mozilla/dom/Document.h"
+
+/**
+ * We have to use macros here because our leak analysis tool things we are
+ * leaking strings when we have |static const nsString|. Sad :(
+ */
+#define LEVELCHANGE_EVENT_NAME u"levelchange"_ns
+#define CHARGINGCHANGE_EVENT_NAME u"chargingchange"_ns
+#define DISCHARGINGTIMECHANGE_EVENT_NAME u"dischargingtimechange"_ns
+#define CHARGINGTIMECHANGE_EVENT_NAME u"chargingtimechange"_ns
+
+namespace mozilla::dom::battery {
+
+BatteryManager::BatteryManager(nsPIDOMWindowInner* aWindow)
+    : DOMEventTargetHelper(aWindow),
+      mLevel(kDefaultLevel),
+      mCharging(kDefaultCharging),
+      mRemainingTime(kDefaultRemainingTime) {}
+
+void BatteryManager::Init() {
+  hal::RegisterBatteryObserver(this);
+
+  hal::BatteryInformation batteryInfo;
+  hal::GetCurrentBatteryInformation(&batteryInfo);
+
+  UpdateFromBatteryInfo(batteryInfo);
+}
+
+void BatteryManager::Shutdown() { hal::UnregisterBatteryObserver(this); }
+
+JSObject* BatteryManager::WrapObject(JSContext* aCx,
+                                     JS::Handle<JSObject*> aGivenProto) {
+  return BatteryManager_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+bool BatteryManager::Charging() const {
+  MOZ_ASSERT(NS_IsMainThread());
+  // For testing, unable to report the battery status information
+  if (Preferences::GetBool("dom.battery.test.default", false)) {
+    return true;
+  }
+  if (Preferences::GetBool("dom.battery.test.charging", false)) {
+    return true;
+  }
+  if (Preferences::GetBool("dom.battery.test.discharging", false)) {
+    return false;
+  }
+
+  return mCharging;
+}
+
+double BatteryManager::DischargingTime() const {
+  MOZ_ASSERT(NS_IsMainThread());
+  // For testing, unable to report the battery status information
+  if (Preferences::GetBool("dom.battery.test.default", false)) {
+    return std::numeric_limits<double>::infinity();
+  }
+  if (Preferences::GetBool("dom.battery.test.discharging", false)) {
+    return 42.0;
+  }
+
+  if (Charging() || mRemainingTime == kUnknownRemainingTime) {
+    return std::numeric_limits<double>::infinity();
+  }
+
+  return mRemainingTime;
+}
+
+double BatteryManager::ChargingTime() const {
+  MOZ_ASSERT(NS_IsMainThread());
+  // For testing, unable to report the battery status information
+  if (Preferences::GetBool("dom.battery.test.default", false)) {
+    return 0.0;
+  }
+  if (Preferences::GetBool("dom.battery.test.charging", false)) {
+    return 42.0;
+  }
+
+  if (!Charging() || mRemainingTime == kUnknownRemainingTime) {
+    return std::numeric_limits<double>::infinity();
+  }
+
+  return mRemainingTime;
+}
+
+double BatteryManager::Level() const {
+  MOZ_ASSERT(NS_IsMainThread());
+  // For testing, unable to report the battery status information
+  if (Preferences::GetBool("dom.battery.test.default")) {
+    return 1.0;
+  }
+
+  return mLevel;
+}
+
+void BatteryManager::UpdateFromBatteryInfo(
+    const hal::BatteryInformation& aBatteryInfo) {
+  mLevel = aBatteryInfo.level();
+
+  // Round to the nearest ten percent for non-chrome.
+  Document* doc = GetOwner() ? GetOwner()->GetDoc() : nullptr;
+
+  mCharging = aBatteryInfo.charging();
+  mRemainingTime = aBatteryInfo.remainingTime();
+
+  if (!nsContentUtils::IsChromeDoc(doc)) {
+    mLevel = lround(mLevel * 10.0) / 10.0;
+    if (mLevel == 1.0) {
+      mRemainingTime =
+          mCharging ? kDefaultRemainingTime : kUnknownRemainingTime;
+    } else if (mRemainingTime != kUnknownRemainingTime) {
+      // Round the remaining time to a multiple of 15 minutes and never zero
+      const double MINUTES_15 = 15.0 * 60.0;
+      mRemainingTime =
+          fmax(lround(mRemainingTime / MINUTES_15) * MINUTES_15, MINUTES_15);
+    }
+  }
+
+  // Add some guards to make sure the values are coherent.
+  if (mLevel == 1.0 && mCharging == true &&
+      mRemainingTime != kDefaultRemainingTime) {
+    mRemainingTime = kDefaultRemainingTime;
+    NS_ERROR(
+        "Battery API: When charging and level at 1.0, remaining time "
+        "should be 0. Please fix your backend!");
+  }
+}
+
+void BatteryManager::Notify(const hal::BatteryInformation& aBatteryInfo) {
+  double previousLevel = mLevel;
+  bool previousCharging = mCharging;
+  double previousRemainingTime = mRemainingTime;
+
+  UpdateFromBatteryInfo(aBatteryInfo);
+
+  if (previousCharging != mCharging) {
+    DispatchTrustedEvent(CHARGINGCHANGE_EVENT_NAME);
+  }
+
+  if (previousLevel != mLevel) {
+    DispatchTrustedEvent(LEVELCHANGE_EVENT_NAME);
+  }
+
+  /*
+   * There are a few situations that could happen here:
+   * 1. Charging state changed:
+   *   a. Previous remaining time wasn't unkwonw, we have to fire an event for
+   *      the change.
+   *   b. New remaining time isn't unkwonw, we have to fire an event for it.
+   * 2. Charging state didn't change but remainingTime did, we have to fire
+   *    the event that correspond to the current charging state.
+   */
+  if (mCharging != previousCharging) {
+    if (previousRemainingTime != kUnknownRemainingTime) {
+      DispatchTrustedEvent(previousCharging ? CHARGINGTIMECHANGE_EVENT_NAME
+                                            : DISCHARGINGTIMECHANGE_EVENT_NAME);
+    }
+    if (mRemainingTime != kUnknownRemainingTime) {
+      DispatchTrustedEvent(mCharging ? CHARGINGTIMECHANGE_EVENT_NAME
+                                     : DISCHARGINGTIMECHANGE_EVENT_NAME);
+    }
+  } else if (previousRemainingTime != mRemainingTime) {
+    DispatchTrustedEvent(mCharging ? CHARGINGTIMECHANGE_EVENT_NAME
+                                   : DISCHARGINGTIMECHANGE_EVENT_NAME);
+  }
+}
+
+}  // namespace mozilla::dom::battery
diff --git a/dom/battery/BatteryManager.h b/dom/battery/BatteryManager.h
new file mode 100644
index 0000000000..c92df7e662
--- /dev/null
+++ b/dom/battery/BatteryManager.h
@@ -0,0 +1,77 @@
+/* -*- 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/. */
+
+#ifndef mozilla_dom_battery_BatteryManager_h
+#define mozilla_dom_battery_BatteryManager_h
+
+#include "mozilla/DOMEventTargetHelper.h"
+#include "mozilla/HalBatteryInformation.h"
+
+namespace mozilla {
+
+namespace hal {
+class BatteryInformation;
+}  // namespace hal
+
+namespace dom::battery {
+
+class BatteryManager : public DOMEventTargetHelper,
+                       public hal::BatteryObserver {
+ public:
+  explicit BatteryManager(nsPIDOMWindowInner* aWindow);
+
+  void Init();
+  void Shutdown();
+
+  // For IObserver.
+  void Notify(const hal::BatteryInformation& aBatteryInfo) override;
+
+  /**
+   * WebIDL Interface
+   */
+
+  nsPIDOMWindowInner* GetParentObject() const { return GetOwner(); }
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  bool Charging() const;
+
+  double ChargingTime() const;
+
+  double DischargingTime() const;
+
+  double Level() const;
+
+  IMPL_EVENT_HANDLER(chargingchange)
+  IMPL_EVENT_HANDLER(chargingtimechange)
+  IMPL_EVENT_HANDLER(dischargingtimechange)
+  IMPL_EVENT_HANDLER(levelchange)
+
+ private:
+  /**
+   * Update the battery information stored in the battery manager object using
+   * a battery information object.
+   */
+  void UpdateFromBatteryInfo(const hal::BatteryInformation& aBatteryInfo);
+
+  /**
+   * Represents the battery level, ranging from 0.0 (dead or removed?)
+   * to 1.0 (fully charged)
+   */
+  double mLevel;
+  bool mCharging;
+  /**
+   * Represents the discharging time or the charging time, depending on the
+   * current battery status (charging or not).
+   */
+  double mRemainingTime;
+};
+
+}  // namespace dom::battery
+}  // namespace mozilla
+
+#endif  // mozilla_dom_battery_BatteryManager_h
diff --git a/dom/battery/Constants.h b/dom/battery/Constants.h
new file mode 100644
index 0000000000..3e0b852647
--- /dev/null
+++ b/dom/battery/Constants.h
@@ -0,0 +1,23 @@
+/* -*- 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/. */
+
+#ifndef mozilla_dom_battery_Constants_h__
+#define mozilla_dom_battery_Constants_h__
+
+/**
+ * A set of constants that might need to be used by battery backends.
+ * It's not part of BatteryManager.h to prevent those backends to include it.
+ */
+namespace mozilla::dom::battery {
+
+static const double kDefaultLevel = 1.0;
+static const bool kDefaultCharging = true;
+static const double kDefaultRemainingTime = 0;
+static const double kUnknownRemainingTime = -1;
+
+}  // namespace mozilla::dom::battery
+
+#endif  // mozilla_dom_battery_Constants_h__
diff --git a/dom/battery/moz.build b/dom/battery/moz.build
new file mode 100644
index 0000000000..4ef4e98487
--- /dev/null
+++ b/dom/battery/moz.build
@@ -0,0 +1,23 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+with Files("**"):
+    BUG_COMPONENT = ("Core", "DOM: Device Interfaces")
+
+EXPORTS.mozilla.dom.battery += [
+    "Constants.h",
+]
+
+SOURCES += [
+    "BatteryManager.cpp",
+]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul"
+
+MOCHITEST_CHROME_MANIFESTS += ["test/chrome.ini"]
+MOCHITEST_MANIFESTS += ["test/mochitest.ini"]
diff --git a/dom/battery/test/chrome.ini b/dom/battery/test/chrome.ini
new file mode 100644
index 0000000000..ced199bffe
--- /dev/null
+++ b/dom/battery/test/chrome.ini
@@ -0,0 +1,3 @@
+[test_battery_basics.html]
+[test_battery_charging.html]
+[test_battery_discharging.html]
diff --git a/dom/battery/test/mochitest.ini b/dom/battery/test/mochitest.ini
new file mode 100644
index 0000000000..4d8307930e
--- /dev/null
+++ b/dom/battery/test/mochitest.ini
@@ -0,0 +1 @@
+[test_battery_unprivileged.html]
diff --git a/dom/battery/test/test_battery_basics.html b/dom/battery/test/test_battery_basics.html
new file mode 100644
index 0000000000..3cc16ad1e8
--- /dev/null
+++ b/dom/battery/test/test_battery_basics.html
@@ -0,0 +1,39 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Battery API</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+
+/** Test for Battery API **/
+ok("getBattery" in navigator, "navigator.getBattery should exist");
+ok(!("battery" in navigator), "navigator.battery should not exist");
+
+navigator.getBattery().then(function(battery) {
+  ok(battery.level >= 0.0 && battery.level <= 1.0, "Battery level " + battery.level + " should be in the range [0.0, 1.0]");
+
+  SpecialPowers.pushPrefEnv({"set": [["dom.battery.test.default", true]]}, function() {
+    ok(battery.charging, "Battery should be charging by default");
+    is(battery.chargingTime, 0, "Battery chargingTime " + battery.chargingTime + " should be zero by default");
+    is(battery.dischargingTime, Infinity, "Battery dischargingTime should be Infinity by default");
+    is(battery.level, 1.0, "Battery level " + battery.level + " should be 1.0 by default");
+
+    SimpleTest.finish();
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/battery/test/test_battery_charging.html b/dom/battery/test/test_battery_charging.html
new file mode 100644
index 0000000000..b284253aef
--- /dev/null
+++ b/dom/battery/test/test_battery_charging.html
@@ -0,0 +1,35 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Battery API</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+
+/** Test for Battery API **/
+navigator.getBattery().then(function(battery) {
+  ok(battery.level >= 0.0 && battery.level <= 1.0, "Battery level " + battery.level + " should be in the range [0.0, 1.0]");
+
+  SpecialPowers.pushPrefEnv({"set": [["dom.battery.test.charging", true]]}, function() {
+    is(battery.charging, true, "Battery should be charging");
+    ok(battery.chargingTime >= 0, "Battery chargingTime " + battery.chargingTime + " should be nonnegative when charging");
+    is(battery.dischargingTime, Infinity, "Battery dischargingTime should be Infinity when charging");
+
+    SimpleTest.finish();
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/battery/test/test_battery_discharging.html b/dom/battery/test/test_battery_discharging.html
new file mode 100644
index 0000000000..916e3725e7
--- /dev/null
+++ b/dom/battery/test/test_battery_discharging.html
@@ -0,0 +1,35 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Battery API</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+
+/** Test for Battery API **/
+navigator.getBattery().then(function(battery) {
+  ok(battery.level >= 0.0 && battery.level <= 1.0, "Battery level " + battery.level + " should be in the range [0.0, 1.0]");
+
+  SpecialPowers.pushPrefEnv({"set": [["dom.battery.test.discharging", true]]}, function() {
+    is(battery.charging, false, "Battery should be discharging");
+    is(battery.chargingTime, Infinity, "Battery chargingTime should be Infinity when discharging");
+    ok(battery.dischargingTime > 0, "Battery dischargingTime " + battery.dischargingTime + " should be positive when discharging");
+
+    SimpleTest.finish();
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/battery/test/test_battery_unprivileged.html b/dom/battery/test/test_battery_unprivileged.html
new file mode 100644
index 0000000000..2129aaf6a4
--- /dev/null
+++ b/dom/battery/test/test_battery_unprivileged.html
@@ -0,0 +1,25 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Battery API</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+"use strict";
+
+/** Test for Battery API **/
+ok(!("getBattery" in navigator), "navigator.getBattery should not exist for unprivileged web content");
+ok(!("battery" in navigator), "navigator.battery should not exist");
+ok(!("BatteryManager" in window), "BatteryManager should not exist");
+
+</script>
+</pre>
+</body>
+</html>