1 files changed, 180 insertions, 0 deletions
diff --git a/dom/presentation/Presentation.cpp b/dom/presentation/Presentation.cpp
new file mode 100644
index 0000000000..9f27fa56f7
--- /dev/null
+++ b/dom/presentation/Presentation.cpp
@@ -0,0 +1,180 @@
+/* -*- 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 "Presentation.h"
+
+#include <ctype.h>
+
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/PresentationBinding.h"
+#include "mozilla/dom/PresentationRequest.h"
+#include "mozilla/dom/Promise.h"
+#include "nsContentUtils.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsIDocShell.h"
+#include "nsIScriptSecurityManager.h"
+#include "nsJSUtils.h"
+#include "nsNetUtil.h"
+#include "nsPIDOMWindow.h"
+#include "nsSandboxFlags.h"
+#include "nsServiceManagerUtils.h"
+#include "PresentationReceiver.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Presentation, mWindow, mDefaultRequest,
+                                      mReceiver)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(Presentation)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(Presentation)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Presentation)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+/* static */
+already_AddRefed<Presentation> Presentation::Create(
+    nsPIDOMWindowInner* aWindow) {
+  RefPtr<Presentation> presentation = new Presentation(aWindow);
+  return presentation.forget();
+}
+
+Presentation::Presentation(nsPIDOMWindowInner* aWindow) : mWindow(aWindow) {}
+
+Presentation::~Presentation() = default;
+
+/* virtual */
+JSObject* Presentation::WrapObject(JSContext* aCx,
+                                   JS::Handle<JSObject*> aGivenProto) {
+  return Presentation_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void Presentation::SetDefaultRequest(PresentationRequest* aRequest) {
+  if (nsContentUtils::ShouldResistFingerprinting()) {
+    return;
+  }
+
+  nsCOMPtr<Document> doc = mWindow ? mWindow->GetExtantDoc() : nullptr;
+  if (NS_WARN_IF(!doc)) {
+    return;
+  }
+
+  if (doc->GetSandboxFlags() & SANDBOXED_PRESENTATION) {
+    return;
+  }
+
+  mDefaultRequest = aRequest;
+}
+
+already_AddRefed<PresentationRequest> Presentation::GetDefaultRequest() const {
+  if (nsContentUtils::ShouldResistFingerprinting()) {
+    return nullptr;
+  }
+
+  RefPtr<PresentationRequest> request = mDefaultRequest;
+  return request.forget();
+}
+
+already_AddRefed<PresentationReceiver> Presentation::GetReceiver() {
+  if (nsContentUtils::ShouldResistFingerprinting()) {
+    return nullptr;
+  }
+
+  // return the same receiver if already created
+  if (mReceiver) {
+    RefPtr<PresentationReceiver> receiver = mReceiver;
+    return receiver.forget();
+  }
+
+  if (!HasReceiverSupport() || !IsInPresentedContent()) {
+    return nullptr;
+  }
+
+  mReceiver = PresentationReceiver::Create(mWindow);
+  if (NS_WARN_IF(!mReceiver)) {
+    MOZ_ASSERT(mReceiver);
+    return nullptr;
+  }
+
+  RefPtr<PresentationReceiver> receiver = mReceiver;
+  return receiver.forget();
+}
+
+void Presentation::SetStartSessionUnsettled(bool aIsUnsettled) {
+  mStartSessionUnsettled = aIsUnsettled;
+}
+
+bool Presentation::IsStartSessionUnsettled() const {
+  return mStartSessionUnsettled;
+}
+
+bool Presentation::HasReceiverSupport() const {
+  if (!mWindow) {
+    return false;
+  }
+
+  // Grant access to browser receiving pages and their same-origin iframes. (App
+  // pages should be controlled by "presentation" permission in app manifests.)
+  nsCOMPtr<nsIDocShell> docShell = mWindow->GetDocShell();
+  if (!docShell) {
+    return false;
+  }
+
+  if (!StaticPrefs::dom_presentation_testing_simulate_receiver() &&
+      !docShell->GetIsTopLevelContentDocShell()) {
+    return false;
+  }
+
+  nsAutoString presentationURL;
+  nsContentUtils::GetPresentationURL(docShell, presentationURL);
+
+  if (presentationURL.IsEmpty()) {
+    return false;
+  }
+
+  nsCOMPtr<nsIScriptSecurityManager> securityManager =
+      nsContentUtils::GetSecurityManager();
+  if (!securityManager) {
+    return false;
+  }
+
+  nsCOMPtr<nsIURI> presentationURI;
+  nsresult rv = NS_NewURI(getter_AddRefs(presentationURI), presentationURL);
+  if (NS_FAILED(rv)) {
+    return false;
+  }
+
+  bool isPrivateWin = false;
+  nsCOMPtr<Document> doc = mWindow->GetExtantDoc();
+  if (doc) {
+    isPrivateWin =
+        doc->NodePrincipal()->OriginAttributesRef().mPrivateBrowsingId > 0;
+  }
+
+  nsCOMPtr<nsIURI> docURI = mWindow->GetDocumentURI();
+  return NS_SUCCEEDED(securityManager->CheckSameOriginURI(
+      presentationURI, docURI, false, isPrivateWin));
+}
+
+bool Presentation::IsInPresentedContent() const {
+  if (!mWindow) {
+    return false;
+  }
+
+  nsCOMPtr<nsIDocShell> docShell = mWindow->GetDocShell();
+  MOZ_ASSERT(docShell);
+
+  nsAutoString presentationURL;
+  nsContentUtils::GetPresentationURL(docShell, presentationURL);
+
+  return !presentationURL.IsEmpty();
+}
+
+}  // namespace dom
+}  // namespace mozilla