text: /*
   * Copyright (C) 2013 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:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * 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.
   *     * Neither the name of Google Inc. 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/webmidi/navigator_web_midi.h"
  
  #include "third_party/blink/public/mojom/permissions_policy/permissions_policy.mojom-blink.h"
  #include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
  #include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
  #include "third_party/blink/renderer/bindings/modules/v8/v8_midi_options.h"
  #include "third_party/blink/renderer/core/dom/dom_exception.h"
  #include "third_party/blink/renderer/core/execution_context/execution_context.h"
  #include "third_party/blink/renderer/core/frame/deprecation.h"
  #include "third_party/blink/renderer/core/frame/local_dom_window.h"
  #include "third_party/blink/renderer/core/frame/local_frame.h"
  #include "third_party/blink/renderer/core/frame/navigator.h"
  #include "third_party/blink/renderer/core/inspector/console_message.h"
  #include "third_party/blink/renderer/modules/webmidi/midi_access_initializer.h"
  #include "third_party/blink/renderer/platform/bindings/exception_state.h"
  #include "third_party/blink/renderer/platform/heap/garbage_collected.h"
  #include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
  
  namespace blink {
  namespace {
  
  const char kFeaturePolicyErrorMessage[] =
      "Midi has been disabled in this document by permissions policy.";
  const char kFeaturePolicyConsoleWarning[] =
      "Midi access has been blocked because of a permissions policy applied to "
      "the current document. See https://goo.gl/EuHzyv for more details.";
  
  }  // namespace
  
  NavigatorWebMIDI::NavigatorWebMIDI(Navigator& navigator)
      : Supplement<Navigator>(navigator) {}
  
  void NavigatorWebMIDI::Trace(Visitor* visitor) const {
    Supplement<Navigator>::Trace(visitor);
  }
  
  const char NavigatorWebMIDI::kSupplementName[] = "NavigatorWebMIDI";
  
  NavigatorWebMIDI& NavigatorWebMIDI::From(Navigator& navigator) {
    NavigatorWebMIDI* supplement =
        Supplement<Navigator>::From<NavigatorWebMIDI>(navigator);
    if (!supplement) {
      supplement = MakeGarbageCollected<NavigatorWebMIDI>(navigator);
      ProvideTo(navigator, supplement);
    }
    return *supplement;
  }
  
  ScriptPromise NavigatorWebMIDI::requestMIDIAccess(
      ScriptState* script_state,
      Navigator& navigator,
      const MIDIOptions* options,
      ExceptionState& exception_state) {
    return NavigatorWebMIDI::From(navigator).requestMIDIAccess(
        script_state, options, exception_state);
  }
  
  ScriptPromise NavigatorWebMIDI::requestMIDIAccess(
      ScriptState* script_state,
      const MIDIOptions* options,
      ExceptionState& exception_state) {
    if (!script_state->ContextIsValid()) {
      exception_state.ThrowDOMException(DOMExceptionCode::kAbortError,
                                        "The frame is not working.");
      return ScriptPromise();
    }
  
    LocalDOMWindow* window = LocalDOMWindow::From(script_state);
    if (options->hasSysex() && options->sysex()) {
      UseCounter::Count(
          window,
          WebFeature::kRequestMIDIAccessWithSysExOption_ObscuredByFootprinting);
      window->CountUseOnlyInCrossOriginIframe(
          WebFeature::
              kRequestMIDIAccessIframeWithSysExOption_ObscuredByFootprinting);
    } else {
      // In the recent spec, the step 7 below allows user-agents to prompt the
      // user for permission regardless of sysex option.
      // https://webaudio.github.io/web-midi-api/#dom-navigator-requestmidiaccess
      // https://crbug.com/662000.
      if (window->IsSecureContext()) {
        Deprecation::CountDeprecation(
            window, WebFeature::kNoSysexWebMIDIWithoutPermission);
      }
    }
    window->CountUseOnlyInCrossOriginIframe(
        WebFeature::kRequestMIDIAccessIframe_ObscuredByFootprinting);
  
    if (!window->IsFeatureEnabled(
            mojom::blink::PermissionsPolicyFeature::kMidiFeature,
            ReportOptions::kReportOnFailure, kFeaturePolicyConsoleWarning)) {
      UseCounter::Count(window, WebFeature::kMidiDisabledByFeaturePolicy);
      exception_state.ThrowSecurityError(kFeaturePolicyErrorMessage);
      return ScriptPromise();
    }
  
    return MIDIAccessInitializer::Start(script_state, options);
  }
  
  }  // namespace blink
  