/* -*- 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/dom/MediaError.h"

#include <string>

#include <unordered_set>

#include "mozilla/dom/MediaErrorBinding.h"

#include "nsContentUtils.h"

#include "nsIScriptError.h"

#include "jsapi.h"

namespace mozilla {

namespace dom {

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(MediaError, mParent)

NS_IMPL_CYCLE_COLLECTING_ADDREF(MediaError)

NS_IMPL_CYCLE_COLLECTING_RELEASE(MediaError)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaError)

  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY

  NS_INTERFACE_MAP_ENTRY(nsISupports)

NS_INTERFACE_MAP_END

MediaError::MediaError(HTMLMediaElement* aParent, uint16_t aCode,

                       const nsACString& aMessage)

  : mParent(aParent)

  , mCode(aCode)

  , mMessage(aMessage)

{

}

void

MediaError::GetMessage(nsAString& aResult) const

{

  // When fingerprinting resistance is enabled, only messages in this list

  // can be returned to content script.

  static const std::unordered_set<std::string> whitelist = {

    "404: Not Found"

    // TODO

  };

  bool shouldBlank = (whitelist.find(mMessage.get()) == whitelist.end());

  if (shouldBlank) {

    // Print a warning message to JavaScript console to alert developers of

    // a non-whitelisted error message.

    nsAutoCString message =

      NS_LITERAL_CSTRING(

        "This error message will be blank when privacy.resistFingerprinting = true."

        "  If it is really necessary, please add it to the whitelist in"

        " MediaError::GetMessage: ") +

      mMessage;

    nsIDocument* ownerDoc = mParent->OwnerDoc();

    AutoJSAPI api;

    if (api.Init(ownerDoc->GetScopeObject())) {

      // We prefer this API because it can also print to our debug log and

      // try server's log viewer.

      JS_ReportWarningASCII(api.cx(), "%s", message.get());

    } else {

      // If failed to use JS_ReportWarningASCII, fall back to

      // nsContentUtils::ReportToConsoleNonLocalized, which can only print to

      // JavaScript console.

      nsContentUtils::ReportToConsoleNonLocalized(

        NS_ConvertASCIItoUTF16(message),

        nsIScriptError::warningFlag,

        NS_LITERAL_CSTRING("MediaError"),

        ownerDoc

      );

    }

  }

  if (!nsContentUtils::IsCallerChrome() &&

      nsContentUtils::ShouldResistFingerprinting() &&

      shouldBlank) {

    aResult.Truncate();

    return;

  }

  CopyUTF8toUTF16(mMessage, aResult);

}

JSObject*

MediaError::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)

{

  return MediaError_Binding::Wrap(aCx, this, aGivenProto);

}

} // namespace dom

} // namespace mozilla