Bug 940273 - Part 5 - Expose Service Worker Cache as window.caches when pref is enabled. r=ehsan

dom/base/nsGlobalWindow.cpp

@@ -207,6 +207,7 @@
 #include "mozilla/dom/AudioContext.h"
 #include "mozilla/dom/BlobBinding.h"
 #include "mozilla/dom/BrowserElementDictionariesBinding.h"
+#include "mozilla/dom/cache/CacheStorage.h"
 #include "mozilla/dom/Console.h"
 #include "mozilla/dom/Fetch.h"
 #include "mozilla/dom/FunctionBinding.h"
@@ -260,6 +261,7 @@ using namespace mozilla::dom;
 using namespace mozilla::dom::ipc;
 using mozilla::TimeStamp;
 using mozilla::TimeDuration;
+using mozilla::dom::cache::CacheStorage;
 using mozilla::dom::indexedDB::IDBFactory;
 
 nsGlobalWindow::WindowByIdTable *nsGlobalWindow::sWindowsById = nullptr;
@@ -1786,6 +1788,7 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(nsGlobalWindow)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mGamepads)
 #endif
 
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCacheStorage)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mVRDevices)
 
   // Traverse stuff from nsPIDOMWindow
@@ -1849,6 +1852,7 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsGlobalWindow)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mGamepads)
 #endif
 
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mCacheStorage)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mVRDevices)
 
   // Unlink stuff from nsPIDOMWindow
@@ -10719,6 +10723,18 @@ nsGlobalWindow::GetInterface(JSContext* aCx, nsIJSID* aIID,
   dom::GetInterface(aCx, this, aIID, aRetval, aError);
 }
 
+already_AddRefed<CacheStorage>
+nsGlobalWindow::GetCaches(ErrorResult& aRv)
+{
+  if (!mCacheStorage) {
+    mCacheStorage = CacheStorage::CreateOnMainThread(cache::DEFAULT_NAMESPACE,
+                                                     this, GetPrincipal(), aRv);
+  }
+
+  nsRefPtr<CacheStorage> ref = mCacheStorage;
+  return ref.forget();
+}
+
 void
 nsGlobalWindow::FireOfflineStatusEventIfChanged()
 {

dom/base/nsGlobalWindow.h

@@ -115,6 +115,9 @@ class RequestOrUSVString;
 class Selection;
 class SpeechSynthesis;
 class WakeLock;
+namespace cache {
+class CacheStorage;
+} // namespace cache
 namespace indexedDB {
 class IDBFactory;
 } // namespace indexedDB
@@ -878,6 +881,7 @@ protected:
 public:
   void Alert(mozilla::ErrorResult& aError);
   void Alert(const nsAString& aMessage, mozilla::ErrorResult& aError);
+  already_AddRefed<mozilla::dom::cache::CacheStorage> GetCaches(mozilla::ErrorResult& aRv);
   bool Confirm(const nsAString& aMessage, mozilla::ErrorResult& aError);
   already_AddRefed<mozilla::dom::Promise> Fetch(const mozilla::dom::RequestOrUSVString& aInput,
                                                 const mozilla::dom::RequestInit& aInit,
@@ -1552,6 +1556,7 @@ protected:
   nsString                      mDefaultStatus;
   nsGlobalWindowObserver*       mObserver; // Inner windows only.
   nsRefPtr<mozilla::dom::Crypto>  mCrypto;
+  nsRefPtr<mozilla::dom::cache::CacheStorage> mCacheStorage;
   nsRefPtr<mozilla::dom::Console> mConsole;
   // We need to store an nsISupports pointer to this object because the
   // mozilla::dom::External class doesn't exist on b2g and using the type

dom/tests/mochitest/general/test_interfaces.html

@@ -196,6 +196,10 @@ var interfaceNamesInGlobalScope =
     {name: "BoxObject", xbl: true},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "BroadcastChannel", pref: "dom.broadcastChannel.enabled"},
+// IMPORTANT: Do not change this list without review from a DOM peer!
+    {name: "Cache", pref: "dom.caches.enabled"},
+// IMPORTANT: Do not change this list without review from a DOM peer!
+    {name: "CacheStorage", pref: "dom.caches.enabled"},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "CallEvent", b2g: true, pref: "dom.telephony.enabled"},
 // IMPORTANT: Do not change this list without review from a DOM peer!

dom/webidl/Window.webidl

@@ -250,6 +250,12 @@ interface WindowModal {
 };
 Window implements WindowModal;
 
+// https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#self-caches
+partial interface Window {
+[Throws, Func="mozilla::dom::cache::CacheStorage::PrefEnabled"]
+readonly attribute CacheStorage caches;
+};
+
 // Mozilla-specific stuff
 partial interface Window {
   //[NewObject, Throws] CSSStyleDeclaration getDefaultComputedStyle(Element elt, optional DOMString pseudoElt = "");