Add telemetry for OpenTerminal (#200)

src/Common/MessageHandler.ts

@@ -48,16 +48,38 @@ export function sendCachedDataMessage<TResponseDataModel>(
 
 export function sendMessage(data: any): void {
   if (canSendMessage()) {
-    window.parent.postMessage(
-      {
-        signature: "pcIframe",
-        data: data
-      },
-      window.document.referrer
-    );
+    const dataExplorerWindow = getDataExplorerWindow(window);
+    if (dataExplorerWindow) {
+      dataExplorerWindow.parent.postMessage(
+        {
+          signature: "pcIframe",
+          data: data
+        },
+        dataExplorerWindow.document.referrer
+      );
+    }
   }
 }
 
+// Only exported for unit tests
+export const getDataExplorerWindow = (currentWindow: Window): Window | undefined => {
+  // Start with the current window and traverse up the parent hierarchy to find a window
+  // with `dataExplorerPlatform` property
+  let dataExplorerWindow: Window | undefined = currentWindow;
+  // TODO: Need to `any` here since the window imports Explorer which can't be in strict mode yet
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  while (dataExplorerWindow && (dataExplorerWindow as any).dataExplorerPlatform == undefined) {
+    // If a window does not have a parent, its parent property is a reference to itself.
+    if (dataExplorerWindow.parent == dataExplorerWindow) {
+      dataExplorerWindow = undefined;
+    } else {
+      dataExplorerWindow = dataExplorerWindow.parent;
+    }
+  }
+
+  return dataExplorerWindow;
+};
+
 export function canSendMessage(): boolean {
   return window.parent !== window;
 }