Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 715 insertions, 0 deletions

diff --git a/dom/clients/api/Client.cpp b/dom/clients/api/Client.cpp
new file mode 100644
index 0000000000..1b0b4a2a59
--- /dev/null
+++ b/dom/clients/api/Client.cpp
@@ -0,0 +1,206 @@
+/* -*- 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 "Client.h"
+
+#include "ClientDOMUtil.h"
+#include "mozilla/dom/ClientHandle.h"
+#include "mozilla/dom/ClientIPCTypes.h"
+#include "mozilla/dom/ClientManager.h"
+#include "mozilla/dom/ClientState.h"
+#include "mozilla/dom/DOMMozPromiseRequestHolder.h"
+#include "mozilla/dom/MessagePortBinding.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/WorkerScope.h"
+#include "nsIDUtils.h"
+#include "nsIGlobalObject.h"
+
+namespace mozilla::dom {
+
+using mozilla::dom::ipc::StructuredCloneData;
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(mozilla::dom::Client);
+NS_IMPL_CYCLE_COLLECTING_RELEASE(mozilla::dom::Client);
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(mozilla::dom::Client, mGlobal);
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(mozilla::dom::Client)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+void Client::EnsureHandle() {
+  NS_ASSERT_OWNINGTHREAD(mozilla::dom::Client);
+  if (!mHandle) {
+    mHandle = ClientManager::CreateHandle(
+        ClientInfo(mData->info()),
+        mGlobal->EventTargetFor(TaskCategory::Other));
+  }
+}
+
+Client::Client(nsIGlobalObject* aGlobal, const ClientInfoAndState& aData)
+    : mGlobal(aGlobal), mData(MakeUnique<ClientInfoAndState>(aData)) {
+  MOZ_DIAGNOSTIC_ASSERT(mGlobal);
+}
+
+TimeStamp Client::CreationTime() const { return mData->info().creationTime(); }
+
+TimeStamp Client::LastFocusTime() const {
+  if (mData->info().type() != ClientType::Window) {
+    return TimeStamp();
+  }
+  return mData->state().get_IPCClientWindowState().lastFocusTime();
+}
+
+StorageAccess Client::GetStorageAccess() const {
+  ClientState state(ClientState::FromIPC(mData->state()));
+  return state.GetStorageAccess();
+}
+
+JSObject* Client::WrapObject(JSContext* aCx,
+                             JS::Handle<JSObject*> aGivenProto) {
+  if (mData->info().type() == ClientType::Window) {
+    return WindowClient_Binding::Wrap(aCx, this, aGivenProto);
+  }
+  return Client_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+nsIGlobalObject* Client::GetParentObject() const { return mGlobal; }
+
+void Client::GetUrl(nsAString& aUrlOut) const {
+  CopyUTF8toUTF16(mData->info().url(), aUrlOut);
+}
+
+void Client::GetId(nsAString& aIdOut) const {
+  aIdOut = NSID_TrimBracketsUTF16(mData->info().id());
+}
+
+ClientType Client::Type() const { return mData->info().type(); }
+
+FrameType Client::GetFrameType() const { return mData->info().frameType(); }
+
+void Client::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+                         const Sequence<JSObject*>& aTransferable,
+                         ErrorResult& aRv) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate);
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate->IsServiceWorker());
+  workerPrivate->AssertIsOnWorkerThread();
+
+  JS::Rooted<JS::Value> transferable(aCx, JS::UndefinedValue());
+  aRv = nsContentUtils::CreateJSValueFromSequenceOfObject(aCx, aTransferable,
+                                                          &transferable);
+  if (aRv.Failed()) {
+    return;
+  }
+
+  StructuredCloneData data;
+  data.Write(aCx, aMessage, transferable, JS::CloneDataPolicy(), aRv);
+  if (aRv.Failed()) {
+    return;
+  }
+
+  EnsureHandle();
+  mHandle->PostMessage(data, workerPrivate->GetServiceWorkerDescriptor());
+}
+
+void Client::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+                         const StructuredSerializeOptions& aOptions,
+                         ErrorResult& aRv) {
+  PostMessage(aCx, aMessage, aOptions.mTransfer, aRv);
+}
+
+VisibilityState Client::GetVisibilityState() const {
+  return mData->state().get_IPCClientWindowState().visibilityState();
+}
+
+bool Client::Focused() const {
+  return mData->state().get_IPCClientWindowState().focused();
+}
+
+already_AddRefed<Promise> Client::Focus(CallerType aCallerType,
+                                        ErrorResult& aRv) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate);
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate->IsServiceWorker());
+  workerPrivate->AssertIsOnWorkerThread();
+
+  RefPtr<Promise> outerPromise = Promise::Create(mGlobal, aRv);
+  if (aRv.Failed()) {
+    return outerPromise.forget();
+  }
+
+  if (!workerPrivate->GlobalScope()->WindowInteractionAllowed()) {
+    outerPromise->MaybeReject(NS_ERROR_DOM_INVALID_ACCESS_ERR);
+    return outerPromise.forget();
+  }
+
+  EnsureHandle();
+
+  IPCClientInfo ipcClientInfo(mData->info());
+  auto holder =
+      MakeRefPtr<DOMMozPromiseRequestHolder<ClientStatePromise>>(mGlobal);
+
+  mHandle->Focus(aCallerType)
+      ->Then(
+          mGlobal->EventTargetFor(TaskCategory::Other), __func__,
+          [ipcClientInfo, holder, outerPromise](const ClientState& aResult) {
+            holder->Complete();
+            NS_ENSURE_TRUE_VOID(holder->GetParentObject());
+            RefPtr<Client> newClient =
+                new Client(holder->GetParentObject(),
+                           ClientInfoAndState(ipcClientInfo, aResult.ToIPC()));
+            outerPromise->MaybeResolve(newClient);
+          },
+          [holder, outerPromise](const CopyableErrorResult& aResult) {
+            holder->Complete();
+            // MaybeReject needs a non-const-ref result, so make a copy.
+            outerPromise->MaybeReject(CopyableErrorResult(aResult));
+          })
+      ->Track(*holder);
+
+  return outerPromise.forget();
+}
+
+already_AddRefed<Promise> Client::Navigate(const nsAString& aURL,
+                                           ErrorResult& aRv) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate);
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate->IsServiceWorker());
+  workerPrivate->AssertIsOnWorkerThread();
+
+  RefPtr<Promise> outerPromise = Promise::Create(mGlobal, aRv);
+  if (aRv.Failed()) {
+    return outerPromise.forget();
+  }
+
+  ClientNavigateArgs args(mData->info(), NS_ConvertUTF16toUTF8(aURL),
+                          workerPrivate->GetLocationInfo().mHref,
+                          workerPrivate->GetServiceWorkerDescriptor().ToIPC());
+  RefPtr<Client> self = this;
+
+  StartClientManagerOp(
+      &ClientManager::Navigate, args, mGlobal,
+      [self, outerPromise](const ClientOpResult& aResult) {
+        if (aResult.type() != ClientOpResult::TClientInfoAndState) {
+          outerPromise->MaybeResolve(JS::NullHandleValue);
+          return;
+        }
+        RefPtr<Client> newClient =
+            new Client(self->mGlobal, aResult.get_ClientInfoAndState());
+        outerPromise->MaybeResolve(newClient);
+      },
+      [self, outerPromise](const CopyableErrorResult& aResult) {
+        // MaybeReject needs a non-const-ref result, so make a copy.
+        outerPromise->MaybeReject(CopyableErrorResult(aResult));
+      });
+
+  return outerPromise.forget();
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/clients/api/Client.h b/dom/clients/api/Client.h
new file mode 100644
index 0000000000..cd47ccd93b
--- /dev/null
+++ b/dom/clients/api/Client.h
@@ -0,0 +1,89 @@
+/* -*- 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/. */
+#ifndef _mozilla_dom_Client_h
+#define _mozilla_dom_Client_h
+
+#include "X11UndefineNone.h"
+#include "mozilla/dom/ClientBinding.h"
+#include "mozilla/StorageAccess.h"
+#include "nsCOMPtr.h"
+#include "nsContentUtils.h"
+#include "nsISupports.h"
+#include "nsWrapperCache.h"
+
+class nsIGlobalObject;
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace dom {
+
+class ClientHandle;
+class ClientInfoAndState;
+class Promise;
+template <typename t>
+class Sequence;
+struct StructuredSerializeOptions;
+
+class Client final : public nsISupports, public nsWrapperCache {
+  nsCOMPtr<nsIGlobalObject> mGlobal;
+  UniquePtr<ClientInfoAndState> mData;
+  RefPtr<ClientHandle> mHandle;
+
+  ~Client() = default;
+
+  void EnsureHandle();
+
+ public:
+  Client(nsIGlobalObject* aGlobal, const ClientInfoAndState& aData);
+
+  TimeStamp CreationTime() const;
+
+  TimeStamp LastFocusTime() const;
+
+  StorageAccess GetStorageAccess() const;
+
+  // nsWrapperCache interface methods
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  // DOM bindings methods
+  nsIGlobalObject* GetParentObject() const;
+
+  // Client Bindings
+  void GetUrl(nsAString& aUrlOut) const;
+
+  void GetId(nsAString& aIdOut) const;
+
+  ClientType Type() const;
+
+  FrameType GetFrameType() const;
+
+  // WindowClient bindings
+  VisibilityState GetVisibilityState() const;
+
+  bool Focused() const;
+
+  already_AddRefed<Promise> Focus(CallerType aCallerType, ErrorResult& aRv);
+
+  already_AddRefed<Promise> Navigate(const nsAString& aURL, ErrorResult& aRv);
+
+  void PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+                   const Sequence<JSObject*>& aTransferrable, ErrorResult& aRv);
+
+  void PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+                   const StructuredSerializeOptions& aOptions,
+                   ErrorResult& aRv);
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(mozilla::dom::Client)
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // _mozilla_dom_Client_h
diff --git a/dom/clients/api/ClientDOMUtil.h b/dom/clients/api/ClientDOMUtil.h
new file mode 100644
index 0000000000..2798aeec53
--- /dev/null
+++ b/dom/clients/api/ClientDOMUtil.h
@@ -0,0 +1,48 @@
+/* -*- 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/. */
+#ifndef _mozilla_dom_ClientDOMUtil_h
+#define _mozilla_dom_ClientDOMUtil_h
+
+#include "mozilla/dom/ClientIPCTypes.h"
+#include "mozilla/dom/ClientOpPromise.h"
+#include "mozilla/dom/DOMMozPromiseRequestHolder.h"
+#include "mozilla/dom/WorkerPrivate.h"
+
+class nsIGlobalObject;
+
+namespace mozilla::dom {
+
+// Utility method to properly execute a ClientManager operation.  It
+// will properly hold a worker thread alive and avoid executing callbacks
+// if the thread is shutting down.
+template <typename Func, typename Arg, typename Resolve, typename Reject>
+void StartClientManagerOp(Func aFunc, const Arg& aArg, nsIGlobalObject* aGlobal,
+                          Resolve aResolve, Reject aReject) {
+  MOZ_DIAGNOSTIC_ASSERT(aGlobal);
+
+  nsCOMPtr<nsISerialEventTarget> target =
+      aGlobal->EventTargetFor(TaskCategory::Other);
+
+  auto holder =
+      MakeRefPtr<DOMMozPromiseRequestHolder<ClientOpPromise>>(aGlobal);
+
+  aFunc(aArg, target)
+      ->Then(
+          target, __func__,
+          [aResolve, holder](const ClientOpResult& aResult) {
+            holder->Complete();
+            aResolve(aResult);
+          },
+          [aReject, holder](const CopyableErrorResult& aResult) {
+            holder->Complete();
+            aReject(aResult);
+          })
+      ->Track(*holder);
+}
+
+}  // namespace mozilla::dom
+
+#endif  // _mozilla_dom_ClientDOMUtil_h
diff --git a/dom/clients/api/Clients.cpp b/dom/clients/api/Clients.cpp
new file mode 100644
index 0000000000..6dd88953b3
--- /dev/null
+++ b/dom/clients/api/Clients.cpp
@@ -0,0 +1,292 @@
+/* -*- 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 "Clients.h"
+
+#include "Client.h"
+#include "ClientDOMUtil.h"
+#include "mozilla/dom/ClientIPCTypes.h"
+#include "mozilla/dom/ClientManager.h"
+#include "mozilla/dom/ClientsBinding.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/ServiceWorkerDescriptor.h"
+#include "mozilla/dom/ServiceWorkerManager.h"
+#include "mozilla/dom/WorkerScope.h"
+#include "mozilla/ipc/BackgroundUtils.h"
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/StaticPrefs_privacy.h"
+#include "mozilla/StorageAccess.h"
+#include "nsIGlobalObject.h"
+#include "nsString.h"
+
+namespace mozilla::dom {
+
+using mozilla::ipc::CSPInfo;
+using mozilla::ipc::PrincipalInfo;
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(Clients);
+NS_IMPL_CYCLE_COLLECTING_RELEASE(Clients);
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Clients, mGlobal);
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Clients)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+Clients::Clients(nsIGlobalObject* aGlobal) : mGlobal(aGlobal) {
+  MOZ_DIAGNOSTIC_ASSERT(mGlobal);
+}
+
+JSObject* Clients::WrapObject(JSContext* aCx,
+                              JS::Handle<JSObject*> aGivenProto) {
+  return Clients_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+nsIGlobalObject* Clients::GetParentObject() const { return mGlobal; }
+
+already_AddRefed<Promise> Clients::Get(const nsAString& aClientID,
+                                       ErrorResult& aRv) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate);
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate->IsServiceWorker());
+  workerPrivate->AssertIsOnWorkerThread();
+
+  RefPtr<Promise> outerPromise = Promise::Create(mGlobal, aRv);
+  if (aRv.Failed()) {
+    return outerPromise.forget();
+  }
+
+  nsID id;
+  // nsID::Parse accepts both "{...}" and "...", but we only emit the latter, so
+  // forbid strings that start with "{" to avoid inconsistency and bugs like
+  // bug 1446225.
+  if (aClientID.IsEmpty() || aClientID.CharAt(0) == '{' ||
+      !id.Parse(NS_ConvertUTF16toUTF8(aClientID).get())) {
+    // Invalid ID means we will definitely not find a match, so just
+    // resolve with undefined indicating "not found".
+    outerPromise->MaybeResolveWithUndefined();
+    return outerPromise.forget();
+  }
+
+  const PrincipalInfo& principalInfo = workerPrivate->GetPrincipalInfo();
+  nsCOMPtr<nsISerialEventTarget> target =
+      mGlobal->EventTargetFor(TaskCategory::Other);
+
+  RefPtr<ClientOpPromise> innerPromise = ClientManager::GetInfoAndState(
+      ClientGetInfoAndStateArgs(id, principalInfo), target);
+
+  nsCString scope = workerPrivate->ServiceWorkerScope();
+  auto holder =
+      MakeRefPtr<DOMMozPromiseRequestHolder<ClientOpPromise>>(mGlobal);
+
+  innerPromise
+      ->Then(
+          target, __func__,
+          [outerPromise, holder, scope](const ClientOpResult& aResult) {
+            holder->Complete();
+            NS_ENSURE_TRUE_VOID(holder->GetParentObject());
+            RefPtr<Client> client = new Client(
+                holder->GetParentObject(), aResult.get_ClientInfoAndState());
+            if (client->GetStorageAccess() == StorageAccess::eAllow ||
+                (StaticPrefs::privacy_partition_serviceWorkers() &&
+                 ShouldPartitionStorage(client->GetStorageAccess()))) {
+              outerPromise->MaybeResolve(std::move(client));
+              return;
+            }
+            nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+                "Clients::Get() storage denied", [scope] {
+                  ServiceWorkerManager::LocalizeAndReportToAllClients(
+                      scope, "ServiceWorkerGetClientStorageError",
+                      nsTArray<nsString>());
+                });
+            SchedulerGroup::Dispatch(TaskCategory::Other, r.forget());
+            outerPromise->MaybeResolveWithUndefined();
+          },
+          [outerPromise, holder](const CopyableErrorResult& aResult) {
+            holder->Complete();
+            outerPromise->MaybeResolveWithUndefined();
+          })
+      ->Track(*holder);
+
+  return outerPromise.forget();
+}
+
+namespace {
+
+class MatchAllComparator final {
+ public:
+  bool LessThan(Client* aLeft, Client* aRight) const {
+    TimeStamp leftFocusTime = aLeft->LastFocusTime();
+    TimeStamp rightFocusTime = aRight->LastFocusTime();
+    // If the focus times are the same, then default to creation order.
+    // MatchAll should return oldest Clients first.
+    if (leftFocusTime == rightFocusTime) {
+      return aLeft->CreationTime() < aRight->CreationTime();
+    }
+
+    // Otherwise compare focus times.  We reverse the logic here so
+    // that the most recently focused window is first in the list.
+    if (!leftFocusTime.IsNull() && rightFocusTime.IsNull()) {
+      return true;
+    }
+    if (leftFocusTime.IsNull() && !rightFocusTime.IsNull()) {
+      return false;
+    }
+    return leftFocusTime > rightFocusTime;
+  }
+
+  bool Equals(Client* aLeft, Client* aRight) const {
+    return aLeft->LastFocusTime() == aRight->LastFocusTime() &&
+           aLeft->CreationTime() == aRight->CreationTime();
+  }
+};
+
+}  // anonymous namespace
+
+already_AddRefed<Promise> Clients::MatchAll(const ClientQueryOptions& aOptions,
+                                            ErrorResult& aRv) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate);
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate->IsServiceWorker());
+  workerPrivate->AssertIsOnWorkerThread();
+
+  RefPtr<Promise> outerPromise = Promise::Create(mGlobal, aRv);
+  if (aRv.Failed()) {
+    return outerPromise.forget();
+  }
+
+  nsCOMPtr<nsIGlobalObject> global = mGlobal;
+  nsCString scope = workerPrivate->ServiceWorkerScope();
+
+  ClientMatchAllArgs args(workerPrivate->GetServiceWorkerDescriptor().ToIPC(),
+                          aOptions.mType, aOptions.mIncludeUncontrolled);
+  StartClientManagerOp(
+      &ClientManager::MatchAll, args, mGlobal,
+      [outerPromise, global, scope](const ClientOpResult& aResult) {
+        nsTArray<RefPtr<Client>> clientList;
+        bool storageDenied = false;
+        for (const ClientInfoAndState& value :
+             aResult.get_ClientList().values()) {
+          RefPtr<Client> client = new Client(global, value);
+          if (client->GetStorageAccess() != StorageAccess::eAllow &&
+              (!StaticPrefs::privacy_partition_serviceWorkers() ||
+               !ShouldPartitionStorage(client->GetStorageAccess()))) {
+            storageDenied = true;
+            continue;
+          }
+          clientList.AppendElement(std::move(client));
+        }
+        if (storageDenied) {
+          nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+              "Clients::MatchAll() storage denied", [scope] {
+                ServiceWorkerManager::LocalizeAndReportToAllClients(
+                    scope, "ServiceWorkerGetClientStorageError",
+                    nsTArray<nsString>());
+              });
+          SchedulerGroup::Dispatch(TaskCategory::Other, r.forget());
+        }
+        clientList.Sort(MatchAllComparator());
+        outerPromise->MaybeResolve(clientList);
+      },
+      [outerPromise](const CopyableErrorResult& aResult) {
+        // MaybeReject needs a non-const-ref result, so make a copy.
+        outerPromise->MaybeReject(CopyableErrorResult(aResult));
+      });
+
+  return outerPromise.forget();
+}
+
+already_AddRefed<Promise> Clients::OpenWindow(const nsAString& aURL,
+                                              ErrorResult& aRv) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate);
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate->IsServiceWorker());
+  workerPrivate->AssertIsOnWorkerThread();
+
+  RefPtr<Promise> outerPromise = Promise::Create(mGlobal, aRv);
+  if (aRv.Failed()) {
+    return outerPromise.forget();
+  }
+
+  if (aURL.EqualsLiteral("about:blank")) {
+    CopyableErrorResult rv;
+    rv.ThrowTypeError(
+        "Passing \"about:blank\" to Clients.openWindow is not allowed");
+    outerPromise->MaybeReject(std::move(rv));
+    return outerPromise.forget();
+  }
+
+  if (!workerPrivate->GlobalScope()->WindowInteractionAllowed()) {
+    outerPromise->MaybeReject(NS_ERROR_DOM_INVALID_ACCESS_ERR);
+    return outerPromise.forget();
+  }
+
+  const PrincipalInfo& principalInfo = workerPrivate->GetPrincipalInfo();
+  const CSPInfo& cspInfo = workerPrivate->GetCSPInfo();
+  nsCString baseURL = workerPrivate->GetLocationInfo().mHref;
+
+  ClientOpenWindowArgs args(principalInfo, Some(cspInfo),
+                            NS_ConvertUTF16toUTF8(aURL), baseURL);
+
+  nsCOMPtr<nsIGlobalObject> global = mGlobal;
+
+  StartClientManagerOp(
+      &ClientManager::OpenWindow, args, mGlobal,
+      [outerPromise, global](const ClientOpResult& aResult) {
+        if (aResult.type() != ClientOpResult::TClientInfoAndState) {
+          outerPromise->MaybeResolve(JS::NullHandleValue);
+          return;
+        }
+        RefPtr<Client> client =
+            new Client(global, aResult.get_ClientInfoAndState());
+        outerPromise->MaybeResolve(client);
+      },
+      [outerPromise](const CopyableErrorResult& aResult) {
+        // MaybeReject needs a non-const-ref result, so make a copy.
+        outerPromise->MaybeReject(CopyableErrorResult(aResult));
+      });
+
+  return outerPromise.forget();
+}
+
+already_AddRefed<Promise> Clients::Claim(ErrorResult& aRv) {
+  MOZ_ASSERT(!NS_IsMainThread());
+  WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate);
+  MOZ_DIAGNOSTIC_ASSERT(workerPrivate->IsServiceWorker());
+  workerPrivate->AssertIsOnWorkerThread();
+
+  RefPtr<Promise> outerPromise = Promise::Create(mGlobal, aRv);
+  if (aRv.Failed()) {
+    return outerPromise.forget();
+  }
+
+  const ServiceWorkerDescriptor& serviceWorker =
+      workerPrivate->GetServiceWorkerDescriptor();
+
+  if (serviceWorker.State() != ServiceWorkerState::Activating &&
+      serviceWorker.State() != ServiceWorkerState::Activated) {
+    aRv.ThrowInvalidStateError("Service worker is not active");
+    return outerPromise.forget();
+  }
+
+  StartClientManagerOp(
+      &ClientManager::Claim, ClientClaimArgs(serviceWorker.ToIPC()), mGlobal,
+      [outerPromise](const ClientOpResult& aResult) {
+        outerPromise->MaybeResolveWithUndefined();
+      },
+      [outerPromise](const CopyableErrorResult& aResult) {
+        // MaybeReject needs a non-const-ref result, so make a copy.
+        outerPromise->MaybeReject(CopyableErrorResult(aResult));
+      });
+
+  return outerPromise.forget();
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/clients/api/Clients.h b/dom/clients/api/Clients.h
new file mode 100644
index 0000000000..481b066655
--- /dev/null
+++ b/dom/clients/api/Clients.h
@@ -0,0 +1,55 @@
+/* -*- 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/. */
+#ifndef _mozilla_dom_Clients_h
+#define _mozilla_dom_Clients_h
+
+#include "nsCOMPtr.h"
+#include "nsISupports.h"
+#include "nsWrapperCache.h"
+
+class nsIGlobalObject;
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace dom {
+
+struct ClientQueryOptions;
+class Promise;
+
+class Clients final : public nsISupports, public nsWrapperCache {
+  nsCOMPtr<nsIGlobalObject> mGlobal;
+
+  ~Clients() = default;
+
+ public:
+  explicit Clients(nsIGlobalObject* aGlobal);
+
+  // nsWrapperCache interface methods
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  // DOM bindings methods
+  nsIGlobalObject* GetParentObject() const;
+
+  already_AddRefed<Promise> Get(const nsAString& aClientID, ErrorResult& aRv);
+
+  already_AddRefed<Promise> MatchAll(const ClientQueryOptions& aOptions,
+                                     ErrorResult& aRv);
+
+  already_AddRefed<Promise> OpenWindow(const nsAString& aURL, ErrorResult& aRv);
+
+  already_AddRefed<Promise> Claim(ErrorResult& aRv);
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(Clients)
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // _mozilla_dom_Clients_h
diff --git a/dom/clients/api/moz.build b/dom/clients/api/moz.build
new file mode 100644
index 0000000000..4e864290fd
--- /dev/null
+++ b/dom/clients/api/moz.build
@@ -0,0 +1,25 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+EXPORTS.mozilla.dom += [
+    "Client.h",
+    "Clients.h",
+]
+
+UNIFIED_SOURCES += [
+    "Client.cpp",
+    "Clients.cpp",
+]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul"
+
+MOCHITEST_MANIFESTS += []
+
+BROWSER_CHROME_MANIFESTS += []
+
+XPCSHELL_TESTS_MANIFESTS += []