/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 "StorageAccessPermissionRequest.h"
#include "nsGlobalWindowInner.h"
#include "mozilla/StaticPrefs_dom.h"
#include <cstdlib>

namespace mozilla {
namespace dom {

NS_IMPL_CYCLE_COLLECTION_INHERITED(StorageAccessPermissionRequest,
                                   ContentPermissionRequestBase)

NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(StorageAccessPermissionRequest,
                                               ContentPermissionRequestBase)

StorageAccessPermissionRequest::StorageAccessPermissionRequest(
    nsPIDOMWindowInner* aWindow, nsIPrincipal* aNodePrincipal,
    AllowCallback&& aAllowCallback,
    AllowAnySiteCallback&& aAllowAnySiteCallback,
    CancelCallback&& aCancelCallback)
    : ContentPermissionRequestBase(aNodePrincipal, aWindow,
                                   NS_LITERAL_CSTRING("dom.storage_access"),
                                   NS_LITERAL_CSTRING("storage-access")),
      mAllowCallback(std::move(aAllowCallback)),
      mAllowAnySiteCallback(std::move(aAllowAnySiteCallback)),
      mCancelCallback(std::move(aCancelCallback)),
      mCallbackCalled(false) {
  mPermissionRequests.AppendElement(
      PermissionRequest(mType, nsTArray<nsString>()));
}

StorageAccessPermissionRequest::~StorageAccessPermissionRequest() { Cancel(); }

NS_IMETHODIMP
StorageAccessPermissionRequest::Cancel() {
  if (!mCallbackCalled) {
    mCallbackCalled = true;
    mCancelCallback();
  }
  return NS_OK;
}

NS_IMETHODIMP
StorageAccessPermissionRequest::Allow(JS::HandleValue aChoices) {
  nsTArray<PermissionChoice> choices;
  nsresult rv = TranslateChoices(aChoices, mPermissionRequests, choices);
  if (NS_FAILED(rv)) {
    return rv;
  }

  // There is no support to allow grants automatically from the prompting code
  // path.

  if (!mCallbackCalled) {
    mCallbackCalled = true;
    if (choices.Length() == 1 &&
        choices[0].choice().EqualsLiteral("allow-on-any-site")) {
      mAllowAnySiteCallback();
    } else if (choices.Length() == 1 &&
               choices[0].choice().EqualsLiteral("allow")) {
      mAllowCallback();
    }
  }
  return NS_OK;
}

RefPtr<StorageAccessPermissionRequest::AutoGrantDelayPromise>
StorageAccessPermissionRequest::MaybeDelayAutomaticGrants() {
  RefPtr<AutoGrantDelayPromise::Private> p =
      new AutoGrantDelayPromise::Private(__func__);

  unsigned simulatedDelay = CalculateSimulatedDelay();
  if (simulatedDelay) {
    nsCOMPtr<nsITimer> timer;
    RefPtr<AutoGrantDelayPromise::Private> promise = p;
    nsresult rv = NS_NewTimerWithFuncCallback(
        getter_AddRefs(timer),
        [](nsITimer* aTimer, void* aClosure) -> void {
          auto* promise =
              static_cast<AutoGrantDelayPromise::Private*>(aClosure);
          promise->Resolve(true, __func__);
          NS_RELEASE(aTimer);
          NS_RELEASE(promise);
        },
        promise, simulatedDelay, nsITimer::TYPE_ONE_SHOT,
        "DelayedAllowAutoGrantCallback");
    if (NS_WARN_IF(NS_FAILED(rv))) {
      p->Reject(false, __func__);
    } else {
      // Leak the references here! We'll release them inside the callback.
      Unused << timer.forget();
      Unused << promise.forget();
    }
  } else {
    p->Resolve(false, __func__);
  }
  return p;
}

already_AddRefed<StorageAccessPermissionRequest>
StorageAccessPermissionRequest::Create(
    nsPIDOMWindowInner* aWindow, AllowCallback&& aAllowCallback,
    AllowAnySiteCallback&& aAllowAnySiteCallback,
    CancelCallback&& aCancelCallback) {
  if (!aWindow) {
    return nullptr;
  }
  nsGlobalWindowInner* win = nsGlobalWindowInner::Cast(aWindow);
  if (!win->GetPrincipal()) {
    return nullptr;
  }
  RefPtr<StorageAccessPermissionRequest> request =
      new StorageAccessPermissionRequest(
          aWindow, win->GetPrincipal(), std::move(aAllowCallback),
          std::move(aAllowAnySiteCallback), std::move(aCancelCallback));
  return request.forget();
}

unsigned StorageAccessPermissionRequest::CalculateSimulatedDelay() {
  if (!StaticPrefs::dom_storage_access_auto_grants_delayed()) {
    return 0;
  }

  // Generate a random time value that is at least 5 seconds and at most 15
  // minutes.
  std::srand(static_cast<unsigned>(PR_Now()));

  const unsigned kMin = 5000;
  const unsigned kMax = 6000;
  const unsigned random = std::abs(std::rand());

  return kMin + random % (kMax - kMin);
}

}  // namespace dom
}  // namespace mozilla