dom/workers/ServiceWorkerUpdateJob.cpp
author Masayuki Nakano <masayuki@d-toybox.com>
Fri, 19 May 2017 17:49:41 +0900
changeset 407399 b75c111837a802ceb953dba50a3c5a193d53ca22
parent 405805 4c580a771776f77c667fd457e2915568c2fcd0a7
child 413570 89963ba78c353b23feab0042ebe264049f8d4533
permissions -rw-r--r--
Bug 1339543 part 4 Change nsIWidget::ExecuteNativeKeyBinding() to nsIWidget::GetEditCommands() which just retrieves edit commands for the type r=smaug Now, nsIWidget::ExecuteNativeKeyBinding() isn't used by anybody for executing edit commands. Instead, they need array of edit commands for the key combination. So, the method should be renamed to GetEditCommands() and just return edit commands as an array. MozReview-Commit-ID: 4G0B1lJ8Lbe

/* -*- 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 "ServiceWorkerUpdateJob.h"

#include "nsIScriptError.h"
#include "nsIURL.h"
#include "ServiceWorkerScriptCache.h"
#include "Workers.h"

namespace mozilla {
namespace dom {
namespace workers {

namespace {

/**
 * The spec mandates slightly different behaviors for computing the scope
 * prefix string in case a Service-Worker-Allowed header is specified versus
 * when it's not available.
 *
 * With the header:
 *   "Set maxScopeString to "/" concatenated with the strings in maxScope's
 *    path (including empty strings), separated from each other by "/"."
 * Without the header:
 *   "Set maxScopeString to "/" concatenated with the strings, except the last
 *    string that denotes the script's file name, in registration's registering
 *    script url's path (including empty strings), separated from each other by
 *    "/"."
 *
 * In simpler terms, if the header is not present, we should only use the
 * "directory" part of the pathname, and otherwise the entire pathname should be
 * used.  ScopeStringPrefixMode allows the caller to specify the desired
 * behavior.
 */
enum ScopeStringPrefixMode {
  eUseDirectory,
  eUsePath
};

nsresult
GetRequiredScopeStringPrefix(nsIURI* aScriptURI, nsACString& aPrefix,
                             ScopeStringPrefixMode aPrefixMode)
{
  nsresult rv = aScriptURI->GetPrePath(aPrefix);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (aPrefixMode == eUseDirectory) {
    nsCOMPtr<nsIURL> scriptURL(do_QueryInterface(aScriptURI));
    if (NS_WARN_IF(!scriptURL)) {
      return NS_ERROR_FAILURE;
    }

    nsAutoCString dir;
    rv = scriptURL->GetDirectory(dir);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }

    aPrefix.Append(dir);
  } else if (aPrefixMode == eUsePath) {
    nsAutoCString path;
    rv = aScriptURI->GetPath(path);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }

    aPrefix.Append(path);
  } else {
    MOZ_ASSERT_UNREACHABLE("Invalid value for aPrefixMode");
  }
  return NS_OK;
}

} // anonymous namespace

class ServiceWorkerUpdateJob::CompareCallback final : public serviceWorkerScriptCache::CompareCallback
{
  RefPtr<ServiceWorkerUpdateJob> mJob;

  ~CompareCallback()
  {
  }

public:
  explicit CompareCallback(ServiceWorkerUpdateJob* aJob)
    : mJob(aJob)
  {
    MOZ_ASSERT(mJob);
  }

  virtual void
  ComparisonResult(nsresult aStatus,
                   bool aInCacheAndEqual,
                   const nsAString& aNewCacheName,
                   const nsACString& aMaxScope) override
  {
    mJob->ComparisonResult(aStatus, aInCacheAndEqual, aNewCacheName, aMaxScope);
  }

  virtual void
  SaveLoadFlags(nsLoadFlags aLoadFlags) override
  {
    mJob->SetLoadFlags(aLoadFlags);
  }

  NS_INLINE_DECL_REFCOUNTING(ServiceWorkerUpdateJob::CompareCallback, override)
};

class ServiceWorkerUpdateJob::ContinueUpdateRunnable final : public LifeCycleEventCallback
{
  nsMainThreadPtrHandle<ServiceWorkerUpdateJob> mJob;
  bool mSuccess;

public:
  explicit ContinueUpdateRunnable(const nsMainThreadPtrHandle<ServiceWorkerUpdateJob>& aJob)
    : mJob(aJob)
    , mSuccess(false)
  {
    AssertIsOnMainThread();
  }

  void
  SetResult(bool aResult) override
  {
    mSuccess = aResult;
  }

  NS_IMETHOD
  Run() override
  {
    AssertIsOnMainThread();
    mJob->ContinueUpdateAfterScriptEval(mSuccess);
    mJob = nullptr;
    return NS_OK;
  }
};

class ServiceWorkerUpdateJob::ContinueInstallRunnable final : public LifeCycleEventCallback
{
  nsMainThreadPtrHandle<ServiceWorkerUpdateJob> mJob;
  bool mSuccess;

public:
  explicit ContinueInstallRunnable(const nsMainThreadPtrHandle<ServiceWorkerUpdateJob>& aJob)
    : mJob(aJob)
    , mSuccess(false)
  {
    AssertIsOnMainThread();
  }

  void
  SetResult(bool aResult) override
  {
    mSuccess = aResult;
  }

  NS_IMETHOD
  Run() override
  {
    AssertIsOnMainThread();
    mJob->ContinueAfterInstallEvent(mSuccess);
    mJob = nullptr;
    return NS_OK;
  }
};

ServiceWorkerUpdateJob::ServiceWorkerUpdateJob(nsIPrincipal* aPrincipal,
                                               const nsACString& aScope,
                                               const nsACString& aScriptSpec,
                                               nsILoadGroup* aLoadGroup,
                                               nsLoadFlags aLoadFlags)
  : ServiceWorkerJob(Type::Update, aPrincipal, aScope, aScriptSpec)
  , mLoadGroup(aLoadGroup)
  , mLoadFlags(aLoadFlags)
{
}

already_AddRefed<ServiceWorkerRegistrationInfo>
ServiceWorkerUpdateJob::GetRegistration() const
{
  AssertIsOnMainThread();
  RefPtr<ServiceWorkerRegistrationInfo> ref = mRegistration;
  return ref.forget();
}

ServiceWorkerUpdateJob::ServiceWorkerUpdateJob(Type aType,
                                               nsIPrincipal* aPrincipal,
                                               const nsACString& aScope,
                                               const nsACString& aScriptSpec,
                                               nsILoadGroup* aLoadGroup,
                                               nsLoadFlags aLoadFlags)
  : ServiceWorkerJob(aType, aPrincipal, aScope, aScriptSpec)
  , mLoadGroup(aLoadGroup)
  , mLoadFlags(aLoadFlags)
{
}

ServiceWorkerUpdateJob::~ServiceWorkerUpdateJob()
{
}

void
ServiceWorkerUpdateJob::FailUpdateJob(ErrorResult& aRv)
{
  AssertIsOnMainThread();
  MOZ_ASSERT(aRv.Failed());

  // Cleanup after a failed installation.  This essentially implements
  // step 12 of the Install algorithm.
  //
  //  https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#installation-algorithm
  //
  // The spec currently only runs this after an install event fails,
  // but we must handle many more internal errors.  So we check for
  // cleanup on every non-successful exit.
  if (mRegistration) {
    mRegistration->ClearEvaluating();
    mRegistration->ClearInstalling();

    RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
    if (swm) {
      swm->MaybeRemoveRegistration(mRegistration);
    }
  }

  mRegistration = nullptr;

  Finish(aRv);
}

void
ServiceWorkerUpdateJob::FailUpdateJob(nsresult aRv)
{
  ErrorResult rv(aRv);
  FailUpdateJob(rv);
}

void
ServiceWorkerUpdateJob::AsyncExecute()
{
  AssertIsOnMainThread();
  MOZ_ASSERT(GetType() == Type::Update);

  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
  if (Canceled() || !swm) {
    FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
    return;
  }

  // Begin step 1 of the Update algorithm.
  //
  //  https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#update-algorithm

  RefPtr<ServiceWorkerRegistrationInfo> registration =
    swm->GetRegistration(mPrincipal, mScope);

  if (!registration || registration->mPendingUninstall) {
    ErrorResult rv;
    rv.ThrowTypeError<MSG_SW_UPDATE_BAD_REGISTRATION>(NS_ConvertUTF8toUTF16(mScope),
                                                      NS_LITERAL_STRING("uninstalled"));
    FailUpdateJob(rv);
    return;
  }

  // If a Register job with a new script executed ahead of us in the job queue,
  // then our update for the old script no longer makes sense.  Simply abort
  // in this case.
  RefPtr<ServiceWorkerInfo> newest = registration->Newest();
  if (newest && !mScriptSpec.Equals(newest->ScriptSpec())) {
    ErrorResult rv;
    rv.ThrowTypeError<MSG_SW_UPDATE_BAD_REGISTRATION>(NS_ConvertUTF8toUTF16(mScope),
                                                      NS_LITERAL_STRING("changed"));
    FailUpdateJob(rv);
    return;
  }

  SetRegistration(registration);
  Update();
}

void
ServiceWorkerUpdateJob::SetRegistration(ServiceWorkerRegistrationInfo* aRegistration)
{
  AssertIsOnMainThread();

  MOZ_ASSERT(!mRegistration);
  MOZ_ASSERT(aRegistration);
  mRegistration = aRegistration;
}

void
ServiceWorkerUpdateJob::Update()
{
  AssertIsOnMainThread();
  MOZ_ASSERT(!Canceled());

  // SetRegistration() must be called before Update().
  MOZ_ASSERT(mRegistration);
  MOZ_ASSERT(!mRegistration->GetInstalling());

  // Begin the script download and comparison steps starting at step 5
  // of the Update algorithm.

  RefPtr<ServiceWorkerInfo> workerInfo = mRegistration->Newest();
  nsAutoString cacheName;

  // If the script has not changed, we need to perform a byte-for-byte
  // comparison.
  if (workerInfo && workerInfo->ScriptSpec().Equals(mScriptSpec)) {
    cacheName = workerInfo->CacheName();
  }

  RefPtr<CompareCallback> callback = new CompareCallback(this);

  nsresult rv =
    serviceWorkerScriptCache::Compare(mRegistration, mPrincipal, cacheName,
                                      NS_ConvertUTF8toUTF16(mScriptSpec),
                                      callback, mLoadGroup);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    FailUpdateJob(rv);
    return;
  }
}

nsLoadFlags
ServiceWorkerUpdateJob::GetLoadFlags() const
{
  return mLoadFlags;
}

void
ServiceWorkerUpdateJob::SetLoadFlags(nsLoadFlags aLoadFlags)
{
  mLoadFlags = aLoadFlags;
}

void
ServiceWorkerUpdateJob::ComparisonResult(nsresult aStatus,
                                         bool aInCacheAndEqual,
                                         const nsAString& aNewCacheName,
                                         const nsACString& aMaxScope)
{
  AssertIsOnMainThread();

  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
  if (NS_WARN_IF(Canceled() || !swm)) {
    FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
    return;
  }

  // Handle failure of the download or comparison.  This is part of Update
  // step 5 as "If the algorithm asynchronously completes with null, then:".
  if (NS_WARN_IF(NS_FAILED(aStatus))) {
    FailUpdateJob(aStatus);
    return;
  }

  // The spec validates the response before performing the byte-for-byte check.
  // Here we perform the comparison in another module and then validate the
  // script URL and scope.  Make sure to do this validation before accepting
  // an byte-for-byte match since the service-worker-allowed header might have
  // changed since the last time it was installed.

  // This is step 2 the "validate response" section of Update algorithm step 5.
  // Step 1 is performed in the serviceWorkerScriptCache code.

  nsCOMPtr<nsIURI> scriptURI;
  nsresult rv = NS_NewURI(getter_AddRefs(scriptURI), mScriptSpec);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    FailUpdateJob(NS_ERROR_DOM_SECURITY_ERR);
    return;
  }

  nsCOMPtr<nsIURI> maxScopeURI;
  if (!aMaxScope.IsEmpty()) {
    rv = NS_NewURI(getter_AddRefs(maxScopeURI), aMaxScope,
                   nullptr, scriptURI);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      FailUpdateJob(NS_ERROR_DOM_SECURITY_ERR);
      return;
    }
  }

  nsAutoCString defaultAllowedPrefix;
  rv = GetRequiredScopeStringPrefix(scriptURI, defaultAllowedPrefix,
                                    eUseDirectory);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    FailUpdateJob(NS_ERROR_DOM_SECURITY_ERR);
    return;
  }

  nsAutoCString maxPrefix(defaultAllowedPrefix);
  if (maxScopeURI) {
    rv = GetRequiredScopeStringPrefix(maxScopeURI, maxPrefix, eUsePath);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      FailUpdateJob(NS_ERROR_DOM_SECURITY_ERR);
      return;
    }
  }

  if (!StringBeginsWith(mRegistration->mScope, maxPrefix)) {
    nsXPIDLString message;
    NS_ConvertUTF8toUTF16 reportScope(mRegistration->mScope);
    NS_ConvertUTF8toUTF16 reportMaxPrefix(maxPrefix);
    const char16_t* params[] = { reportScope.get(), reportMaxPrefix.get() };

    rv = nsContentUtils::FormatLocalizedString(nsContentUtils::eDOM_PROPERTIES,
                                               "ServiceWorkerScopePathMismatch",
                                               params, message);
    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to format localized string");
    swm->ReportToAllClients(mScope,
                            message,
                            EmptyString(),
                            EmptyString(), 0, 0,
                            nsIScriptError::errorFlag);
    FailUpdateJob(NS_ERROR_DOM_SECURITY_ERR);
    return;
  }

  // The response has been validated, so now we can consider if its a
  // byte-for-byte match.  This is step 6 of the Update algorithm.
  if (aInCacheAndEqual) {
    Finish(NS_OK);
    return;
  }

  Telemetry::Accumulate(Telemetry::SERVICE_WORKER_UPDATED, 1);

  // Begin step 7 of the Update algorithm to evaluate the new script.

  RefPtr<ServiceWorkerInfo> sw =
    new ServiceWorkerInfo(mRegistration->mPrincipal,
                          mRegistration->mScope,
                          mScriptSpec,
                          aNewCacheName,
                          mLoadFlags);

  mRegistration->SetEvaluating(sw);

  nsMainThreadPtrHandle<ServiceWorkerUpdateJob> handle(
      new nsMainThreadPtrHolder<ServiceWorkerUpdateJob>(this));
  RefPtr<LifeCycleEventCallback> callback = new ContinueUpdateRunnable(handle);

  ServiceWorkerPrivate* workerPrivate = sw->WorkerPrivate();
  MOZ_ASSERT(workerPrivate);
  rv = workerPrivate->CheckScriptEvaluation(callback);

  if (NS_WARN_IF(NS_FAILED(rv))) {
    FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
    return;
  }
}

void
ServiceWorkerUpdateJob::ContinueUpdateAfterScriptEval(bool aScriptEvaluationResult)
{
  AssertIsOnMainThread();

  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
  if (Canceled() || !swm) {
    FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
    return;
  }

  // Step 7.5 of the Update algorithm verifying that the script evaluated
  // successfully.

  if (NS_WARN_IF(!aScriptEvaluationResult)) {
    ErrorResult error;

    NS_ConvertUTF8toUTF16 scriptSpec(mScriptSpec);
    NS_ConvertUTF8toUTF16 scope(mRegistration->mScope);
    error.ThrowTypeError<MSG_SW_SCRIPT_THREW>(scriptSpec, scope);
    FailUpdateJob(error);
    return;
  }

  Install(swm);
}

void
ServiceWorkerUpdateJob::Install(ServiceWorkerManager* aSWM)
{
  AssertIsOnMainThread();
  MOZ_DIAGNOSTIC_ASSERT(!Canceled());
  MOZ_DIAGNOSTIC_ASSERT(aSWM);

  MOZ_ASSERT(!mRegistration->GetInstalling());

  // Begin step 2 of the Install algorithm.
  //
  //  https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#installation-algorithm

  mRegistration->TransitionEvaluatingToInstalling();

  // Step 6 of the Install algorithm resolving the job promise.
  InvokeResultCallbacks(NS_OK);

  // The job promise cannot be rejected after this point, but the job can
  // still fail; e.g. if the install event handler throws, etc.

  // fire the updatefound event
  nsCOMPtr<nsIRunnable> upr =
    NewRunnableMethod<RefPtr<ServiceWorkerRegistrationInfo>>(
      aSWM,
      &ServiceWorkerManager::FireUpdateFoundOnServiceWorkerRegistrations,
      mRegistration);
  NS_DispatchToMainThread(upr);

  // Call ContinueAfterInstallEvent(false) on main thread if the SW
  // script fails to load.
  nsCOMPtr<nsIRunnable> failRunnable = NewRunnableMethod<bool>
    (this, &ServiceWorkerUpdateJob::ContinueAfterInstallEvent, false);

  nsMainThreadPtrHandle<ServiceWorkerUpdateJob> handle(
    new nsMainThreadPtrHolder<ServiceWorkerUpdateJob>(this));
  RefPtr<LifeCycleEventCallback> callback = new ContinueInstallRunnable(handle);

  // Send the install event to the worker thread
  ServiceWorkerPrivate* workerPrivate =
    mRegistration->GetInstalling()->WorkerPrivate();
  nsresult rv = workerPrivate->SendLifeCycleEvent(NS_LITERAL_STRING("install"),
                                                  callback, failRunnable);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    ContinueAfterInstallEvent(false /* aSuccess */);
  }
}

void
ServiceWorkerUpdateJob::ContinueAfterInstallEvent(bool aInstallEventSuccess)
{
  if (Canceled()) {
    return FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
  }

  // If we haven't been canceled we should have a registration.  There appears
  // to be a path where it gets cleared before we call into here.  Assert
  // to try to catch this condition, but don't crash in release.
  MOZ_DIAGNOSTIC_ASSERT(mRegistration);
  if (!mRegistration) {
    return FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
  }

  // Continue executing the Install algorithm at step 12.

  // "If installFailed is true"
  if (NS_WARN_IF(!aInstallEventSuccess)) {
    // The installing worker is cleaned up by FailUpdateJob().
    FailUpdateJob(NS_ERROR_DOM_ABORT_ERR);
    return;
  }

  MOZ_DIAGNOSTIC_ASSERT(mRegistration->GetInstalling());
  mRegistration->TransitionInstallingToWaiting();

  Finish(NS_OK);

  // Step 20 calls for explicitly waiting for queued event tasks to fire.  Instead,
  // we simply queue a runnable to execute Activate.  This ensures the events are
  // flushed from the queue before proceeding.

  // Step 22 of the Install algorithm.  Activate is executed after the completion
  // of this job.  The controlling client and skipWaiting checks are performed
  // in TryToActivate().
  mRegistration->TryToActivateAsync();
}

} // namespace workers
} // namespace dom
} // namespace mozilla