add experimental safari compilation (xcode project)

safari/Shared (Extension)/SafariWebExtensionHandler.swift

@@ -0,0 +1,26 @@
+//
+//  SafariWebExtensionHandler.swift
+//  Shared (Extension)
+//
+//  Created by Seth Burkart on 10/9/2023.
+//
+
+import SafariServices
+import os.log
+
+let SFExtensionMessageKey = "message"
+
+class SafariWebExtensionHandler: NSObject, NSExtensionRequestHandling {
+
+    func beginRequest(with context: NSExtensionContext) {
+        let item = context.inputItems[0] as! NSExtensionItem
+        let message = item.userInfo?[SFExtensionMessageKey]
+        os_log(.default, "Received message from browser.runtime.sendNativeMessage: %@", message as! CVarArg)
+
+        let response = NSExtensionItem()
+        response.userInfo = [ SFExtensionMessageKey: [ "Response to": message ] ]
+
+        context.completeRequest(returningItems: [response], completionHandler: nil)
+    }
+
+}