/* -*- 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 "UrlClassifierFeatureBase.h"
#include "Classifier.h"
#include "mozilla/Preferences.h"

namespace mozilla {

using namespace safebrowsing;

namespace net {

namespace {

void OnPrefsChange(const char* aPrefName, void* aArray) {
  auto* array = static_cast<nsTArray<nsCString>*>(aArray);
  MOZ_ASSERT(array);

  nsAutoCString value;
  Preferences::GetCString(aPrefName, value);
  Classifier::SplitTables(value, *array);
}

}  // namespace

NS_INTERFACE_MAP_BEGIN(UrlClassifierFeatureBase)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIUrlClassifierFeature)
  NS_INTERFACE_MAP_ENTRY(nsIUrlClassifierFeature)
  NS_INTERFACE_MAP_ENTRY(nsIUrlClassifierExceptionListObserver)
NS_INTERFACE_MAP_END

NS_IMPL_ADDREF(UrlClassifierFeatureBase)
NS_IMPL_RELEASE(UrlClassifierFeatureBase)

UrlClassifierFeatureBase::UrlClassifierFeatureBase(
    const nsACString& aName, const nsACString& aPrefBlocklistTables,
    const nsACString& aPrefEntitylistTables,
    const nsACString& aPrefBlocklistHosts,
    const nsACString& aPrefEntitylistHosts,
    const nsACString& aPrefBlocklistTableName,
    const nsACString& aPrefEntitylistTableName,
    const nsACString& aPrefExceptionHosts)
    : mName(aName), mPrefExceptionHosts(aPrefExceptionHosts) {
  static_assert(nsIUrlClassifierFeature::blocklist == 0,
                "nsIUrlClassifierFeature::blocklist must be 0");
  static_assert(nsIUrlClassifierFeature::entitylist == 1,
                "nsIUrlClassifierFeature::entitylist must be 1");

  mPrefTables[nsIUrlClassifierFeature::blocklist] = aPrefBlocklistTables;
  mPrefTables[nsIUrlClassifierFeature::entitylist] = aPrefEntitylistTables;

  mPrefHosts[nsIUrlClassifierFeature::blocklist] = aPrefBlocklistHosts;
  mPrefHosts[nsIUrlClassifierFeature::entitylist] = aPrefEntitylistHosts;

  mPrefTableNames[nsIUrlClassifierFeature::blocklist] = aPrefBlocklistTableName;
  mPrefTableNames[nsIUrlClassifierFeature::entitylist] =
      aPrefEntitylistTableName;
}

UrlClassifierFeatureBase::~UrlClassifierFeatureBase() = default;

void UrlClassifierFeatureBase::InitializePreferences() {
  for (uint32_t i = 0; i < 2; ++i) {
    if (!mPrefTables[i].IsEmpty()) {
      Preferences::RegisterCallbackAndCall(OnPrefsChange, mPrefTables[i],
                                           &mTables[i]);
    }

    if (!mPrefHosts[i].IsEmpty()) {
      Preferences::RegisterCallbackAndCall(OnPrefsChange, mPrefHosts[i],
                                           &mHosts[i]);
    }
  }

  nsCOMPtr<nsIUrlClassifierExceptionListService> exceptionListService =
      do_GetService("@mozilla.org/url-classifier/exception-list-service;1");
  if (NS_WARN_IF(!exceptionListService)) {
    return;
  }

  exceptionListService->RegisterAndRunExceptionListObserver(
      mName, mPrefExceptionHosts, this);
}

void UrlClassifierFeatureBase::ShutdownPreferences() {
  for (uint32_t i = 0; i < 2; ++i) {
    if (!mPrefTables[i].IsEmpty()) {
      Preferences::UnregisterCallback(OnPrefsChange, mPrefTables[i],
                                      &mTables[i]);
    }

    if (!mPrefHosts[i].IsEmpty()) {
      Preferences::UnregisterCallback(OnPrefsChange, mPrefHosts[i], &mHosts[i]);
    }
  }

  nsCOMPtr<nsIUrlClassifierExceptionListService> exceptionListService =
      do_GetService("@mozilla.org/url-classifier/exception-list-service;1");
  if (exceptionListService) {
    exceptionListService->UnregisterExceptionListObserver(mName, this);
  }
}

NS_IMETHODIMP
UrlClassifierFeatureBase::OnExceptionListUpdate(const nsACString& aList) {
  mExceptionHosts = aList;
  return NS_OK;
}

NS_IMETHODIMP
UrlClassifierFeatureBase::GetName(nsACString& aName) {
  aName = mName;
  return NS_OK;
}

NS_IMETHODIMP
UrlClassifierFeatureBase::GetTables(nsIUrlClassifierFeature::listType aListType,
                                    nsTArray<nsCString>& aTables) {
  if (aListType != nsIUrlClassifierFeature::blocklist &&
      aListType != nsIUrlClassifierFeature::entitylist) {
    return NS_ERROR_INVALID_ARG;
  }

  aTables = mTables[aListType].Clone();
  return NS_OK;
}

NS_IMETHODIMP
UrlClassifierFeatureBase::HasTable(const nsACString& aTable,
                                   nsIUrlClassifierFeature::listType aListType,
                                   bool* aResult) {
  NS_ENSURE_ARG_POINTER(aResult);

  if (aListType != nsIUrlClassifierFeature::blocklist &&
      aListType != nsIUrlClassifierFeature::entitylist) {
    return NS_ERROR_INVALID_ARG;
  }

  *aResult = mTables[aListType].Contains(aTable);
  return NS_OK;
}

NS_IMETHODIMP
UrlClassifierFeatureBase::HasHostInPreferences(
    const nsACString& aHost, nsIUrlClassifierFeature::listType aListType,
    nsACString& aPrefTableName, bool* aResult) {
  NS_ENSURE_ARG_POINTER(aResult);

  if (aListType != nsIUrlClassifierFeature::blocklist &&
      aListType != nsIUrlClassifierFeature::entitylist) {
    return NS_ERROR_INVALID_ARG;
  }

  *aResult = mHosts[aListType].Contains(aHost);
  if (*aResult) {
    aPrefTableName = mPrefTableNames[aListType];
  }
  return NS_OK;
}

NS_IMETHODIMP
UrlClassifierFeatureBase::GetExceptionHostList(nsACString& aList) {
  aList = mExceptionHosts;
  return NS_OK;
}

NS_IMETHODIMP
UrlClassifierFeatureAntiTrackingBase::GetExceptionHostList(nsACString& aList) {
  if (!StaticPrefs::privacy_antitracking_enableWebcompat()) {
    aList.Truncate();
    return NS_OK;
  }

  return UrlClassifierFeatureBase::GetExceptionHostList(aList);
}

}  // namespace net
}  // namespace mozilla