/* -*- 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/. */

#if defined(ENABLE_TESTS)
#  include "mozilla/ipc/UtilityProcessManager.h"
#  include "mozilla/ipc/UtilityProcessTest.h"
#  include "mozilla/dom/Promise.h"
#  include "mozilla/ProcInfo.h"
#  include "mozilla/IntentionalCrash.h"

#  ifdef XP_WIN
#    include <handleapi.h>
#    include <processthreadsapi.h>
#    include <tlhelp32.h>

#    include "mozilla/WinHandleWatcher.h"
#    include "nsISupports.h"
#    include "nsWindowsHelpers.h"
#  endif

namespace mozilla::ipc {

static UtilityActorName UtilityActorNameFromString(
    const nsACString& aStringName) {
  using namespace mozilla::dom;

  // We use WebIDLUtilityActorNames because UtilityActorNames is not designed
  // for iteration.
  for (size_t i = 0; i < WebIDLUtilityActorNameValues::Count; ++i) {
    auto idlName = static_cast<UtilityActorName>(i);
    const nsDependentCSubstring idlNameString(
        WebIDLUtilityActorNameValues::GetString(idlName));
    if (idlNameString.Equals(aStringName)) {
      return idlName;
    }
  }
  MOZ_CRASH("Unknown utility actor name");
}

// Find the utility process with the given actor or any utility process if
// the actor is UtilityActorName::EndGuard_.
static SandboxingKind FindUtilityProcessWithActor(UtilityActorName aActorName) {
  RefPtr<UtilityProcessManager> utilityProc =
      UtilityProcessManager::GetSingleton();
  MOZ_ASSERT(utilityProc, "No UtilityprocessManager?");

  for (size_t i = 0; i < SandboxingKind::COUNT; ++i) {
    auto sbKind = static_cast<SandboxingKind>(i);
    if (!utilityProc->Process(sbKind)) {
      continue;
    }
    if (aActorName == UtilityActorName::EndGuard_) {
      return sbKind;
    }
    for (auto actor : utilityProc->GetActors(sbKind)) {
      if (actor == aActorName) {
        return sbKind;
      }
    }
  }

  return SandboxingKind::COUNT;
}

#  ifdef XP_WIN
namespace {
// Promise implementation for `UntilChildProcessDead`.
//
// Resolves the provided JS promise when the provided Windows HANDLE becomes
// signaled.
class WinHandlePromiseImpl final {
 public:
  NS_INLINE_DECL_REFCOUNTING(WinHandlePromiseImpl)

  using HandlePtr = mozilla::UniqueFileHandle;

  // Takes ownership of aHandle.
  static void Create(mozilla::UniqueFileHandle handle,
                     RefPtr<mozilla::dom::Promise> promise) {
    MOZ_ASSERT(handle);
    MOZ_ASSERT(promise);

    RefPtr obj{new WinHandlePromiseImpl(std::move(handle), std::move(promise))};

    // WARNING: This creates an owning-reference cycle: (self -> HandleWatcher
    //    -> Runnable -> self). `obj` will therefore only be destroyed when and
    //    if the HANDLE is signaled.
    obj->watcher.Watch(obj->handle.get(), GetCurrentSerialEventTarget(),
                       NewRunnableMethod("WinHandlePromiseImpl::Resolve", obj,
                                         &WinHandlePromiseImpl::Resolve));
  }

 private:
  WinHandlePromiseImpl(mozilla::UniqueFileHandle handle,
                       RefPtr<mozilla::dom::Promise> promise)
      : handle(std::move(handle)), promise(std::move(promise)) {}

  ~WinHandlePromiseImpl() { watcher.Stop(); }

  void Resolve() { promise->MaybeResolveWithUndefined(); }

  mozilla::UniqueFileHandle handle;
  HandleWatcher watcher;
  RefPtr<mozilla::dom::Promise> promise;
};

}  // namespace
#  endif

NS_IMETHODIMP
UtilityProcessTest::StartProcess(const nsTArray<nsCString>& aActorsToRegister,
                                 JSContext* aCx,
                                 mozilla::dom::Promise** aOutPromise) {
  NS_ENSURE_ARG(aOutPromise);
  *aOutPromise = nullptr;
  nsIGlobalObject* global = xpc::CurrentNativeGlobal(aCx);
  if (NS_WARN_IF(!global)) {
    return NS_ERROR_FAILURE;
  }

  ErrorResult erv;
  RefPtr<dom::Promise> promise = dom::Promise::Create(global, erv);
  if (NS_WARN_IF(erv.Failed())) {
    return erv.StealNSResult();
  }

  RefPtr<UtilityProcessManager> utilityProc =
      UtilityProcessManager::GetSingleton();
  MOZ_ASSERT(utilityProc, "No UtilityprocessManager?");

  auto actors = aActorsToRegister.Clone();

  utilityProc->LaunchProcess(SandboxingKind::GENERIC_UTILITY)
      ->Then(
          GetCurrentSerialEventTarget(), __func__,
          [promise, utilityProc, actors = std::move(actors)] {
            RefPtr<UtilityProcessParent> utilityParent =
                utilityProc->GetProcessParent(SandboxingKind::GENERIC_UTILITY);
            Maybe<int32_t> utilityPid =
                utilityProc->ProcessPid(SandboxingKind::GENERIC_UTILITY);
            for (size_t i = 0; i < actors.Length(); ++i) {
              auto uan = UtilityActorNameFromString(actors[i]);
              utilityProc->RegisterActor(utilityParent, uan);
            }
            if (utilityPid.isSome()) {
              promise->MaybeResolve(*utilityPid);
            } else {
              promise->MaybeReject(NS_ERROR_NOT_AVAILABLE);
            }
          },
          [promise](nsresult aError) {
            MOZ_ASSERT_UNREACHABLE(
                "UtilityProcessTest; failure to get Utility process");
            promise->MaybeReject(aError);
          });

  promise.forget(aOutPromise);
  return NS_OK;
}

NS_IMETHODIMP
UtilityProcessTest::NoteIntentionalCrash(uint32_t aPid) {
  mozilla::NoteIntentionalCrash("utility", aPid);
  return NS_OK;
}

NS_IMETHODIMP
UtilityProcessTest::UntilChildProcessDead(
    uint32_t pid, JSContext* cx, ::mozilla::dom::Promise** aOutPromise) {
  NS_ENSURE_ARG(aOutPromise);
  *aOutPromise = nullptr;

#  ifdef XP_WIN
  if (pid == 0) {
    return NS_ERROR_INVALID_ARG;
  }

  nsIGlobalObject* global = xpc::CurrentNativeGlobal(cx);
  if (NS_WARN_IF(!global)) {
    return NS_ERROR_FAILURE;
  }

  ErrorResult erv;
  RefPtr<dom::Promise> promise = dom::Promise::Create(global, erv);
  if (NS_WARN_IF(erv.Failed())) {
    return erv.StealNSResult();
  }

  // Get a fresh handle to the child process with the specified PID.
  mozilla::UniqueFileHandle handle;
  {
    bool failed = false;
    GeckoChildProcessHost::GetAll([&](GeckoChildProcessHost* aProc) {
      if (handle || failed) {
        return;
      }
      if (aProc->GetChildProcessId() != pid) {
        return;
      }

      HANDLE handle_ = nullptr;
      if (!::DuplicateHandle(
              ::GetCurrentProcess(), aProc->GetChildProcessHandle(),
              ::GetCurrentProcess(), &handle_, SYNCHRONIZE, FALSE, 0)) {
        failed = true;
      } else {
        handle.reset(handle_);
      }
    });

    if (failed || !handle) {
      return NS_ERROR_FAILURE;
    }
  }

  // Create and attach the resolver for the promise, giving the handle over to
  // it.
  WinHandlePromiseImpl::Create(std::move(handle), promise);

  promise.forget(aOutPromise);

  return NS_OK;
#  else  // !defined(XP_WIN)
  return NS_ERROR_NOT_IMPLEMENTED;
#  endif
}

NS_IMETHODIMP
UtilityProcessTest::StopProcess(const char* aActorName) {
  using namespace mozilla::dom;

  SandboxingKind sbKind;
  if (aActorName) {
    const nsDependentCString actorStringName(aActorName);
    UtilityActorName actorName = UtilityActorNameFromString(actorStringName);
    sbKind = FindUtilityProcessWithActor(actorName);
  } else {
    sbKind = FindUtilityProcessWithActor(UtilityActorName::EndGuard_);
  }

  if (sbKind == SandboxingKind::COUNT) {
    MOZ_ASSERT_UNREACHABLE(
        "Attempted to stop process for actor when no "
        "such process exists");
    return NS_ERROR_FAILURE;
  }

  RefPtr<UtilityProcessManager> utilityProc =
      UtilityProcessManager::GetSingleton();
  MOZ_ASSERT(utilityProc, "No UtilityprocessManager?");

  utilityProc->CleanShutdown(sbKind);
  Maybe<int32_t> utilityPid = utilityProc->ProcessPid(sbKind);
  MOZ_RELEASE_ASSERT(utilityPid.isNothing(),
                     "Should not have a utility process PID anymore");

  return NS_OK;
}

NS_IMETHODIMP
UtilityProcessTest::TestTelemetryProbes() {
  RefPtr<UtilityProcessManager> utilityProc =
      UtilityProcessManager::GetSingleton();
  MOZ_ASSERT(utilityProc, "No UtilityprocessManager?");

  for (RefPtr<UtilityProcessParent>& parent :
       utilityProc->GetAllProcessesProcessParent()) {
    Unused << parent->SendTestTelemetryProbes();
  }

  return NS_OK;
}

NS_IMPL_ISUPPORTS(UtilityProcessTest, nsIUtilityProcessTest)

}  // namespace mozilla::ipc
#endif  // defined(ENABLE_TESTS)