Bug 1667471 - Expose IsCORSSafelistedRequestHeader in WindowUtils. r=ckerschb

Differential Revision: https://phabricator.services.mozilla.com/D91981

dom/base/nsDOMWindowUtils.cpp

@@ -694,6 +694,15 @@ nsDOMWindowUtils::SendMouseEventCommon(
       aPreventDefault, aIsDOMEventSynthesized, aIsWidgetEventSynthesized);
 }
 
+NS_IMETHODIMP
+nsDOMWindowUtils::IsCORSSafelistedRequestHeader(const nsACString& aName,
+                                                const nsACString& aValue,
+                                                bool* aRetVal) {
+  NS_ENSURE_ARG_POINTER(aRetVal);
+  *aRetVal = nsContentUtils::IsCORSSafelistedRequestHeader(aName, aValue);
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsDOMWindowUtils::SendWheelEvent(float aX, float aY, double aDeltaX,
                                  double aDeltaY, double aDeltaZ,

dom/interfaces/base/nsIDOMWindowUtils.idl

@@ -266,6 +266,12 @@ interface nsIDOMWindowUtils : nsISupports {
 
   uint32_t getPresShellId();
 
+  /**
+   * Returns whether a given header and value is a CORS-safelisted request
+   * header per https://fetch.spec.whatwg.org/#cors-safelisted-request-header
+   */
+  boolean isCORSSafelistedRequestHeader(in ACString name, in ACString value);
+
   /**
    * Following modifiers are for sent*Event() except sendNative*Event().
    * NOTE: MODIFIER_ALT, MODIFIER_CONTROL, MODIFIER_SHIFT and MODIFIER_META