Bug 1368962 P1 Expose LoadInfo::SynthesizeServiceWorkerTainting(). r=ckerschb

netwerk/base/LoadInfo.cpp

@@ -952,6 +952,13 @@ LoadInfo::MaybeIncreaseTainting(uint32_t aTainting)
   return NS_OK;
 }
 
+void
+LoadInfo::SynthesizeServiceWorkerTainting(LoadTainting aTainting)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aTainting <= LoadTainting::Opaque);
+  mTainting = aTainting;
+}
+
 NS_IMETHODIMP
 LoadInfo::GetIsTopLevelLoad(bool *aResult)
 {

netwerk/base/LoadInfo.h

@@ -74,6 +74,14 @@ public:
   // when a separate request is made with the same security properties.
   already_AddRefed<nsILoadInfo> CloneForNewRequest() const;
 
+  // The service worker and fetch specifications require returning the
+  // exact tainting level of the Response passed to FetchEvent.respondWith().
+  // This method allows us to override the tainting level in that case.
+  //
+  // NOTE: This should not be used outside of service worker code! Use
+  //       nsILoadInfo::MaybeIncreaseTainting() instead.
+  void SynthesizeServiceWorkerTainting(LoadTainting aTainting);
+
   void SetIsPreflight();
   void SetUpgradeInsecureRequests();