refactor: move handleIncomingMessage to its own file

src/main/bootloader.ts

@@ -1,6 +1,5 @@
 import { boot } from "./bootloader/kernel.js";
-import exchangeCommunicationKeys from "./bootloader/messages/exchangeCommunicationKeys.js";
+import { handleIncomingMessage } from "./bootloader/messages.js";
-import setLoginKey from "./bootloader/messages/setLoginKey.js";
 
 declare var browser: any; // tsc
 
@@ -10,76 +9,6 @@ header.textContent =
   "Something went wrong! You should not be visiting this page, this page should only be accessed via an invisible iframe.";
 document.body.appendChild(header);
 
-const kernelMessageHandlers = {
-  exchangeCommunicationKeys,
-  setLoginKey,
-};
-
-async function handleIncomingMessage(event: MessageEvent) {
-  if (event.source === null) {
-    return;
-  }
-  if (event.source === window) {
-    return;
-  }
-
-  if (!("nonce" in event.data)) {
-    (event.source as WindowProxy).postMessage(
-      {
-        nonce: "N/A",
-        method: "response",
-        err: "message sent to kernel with no nonce",
-      },
-      event.origin,
-    );
-    return;
-  }
-
-  if (!("method" in event.data)) {
-    (event.source as WindowProxy).postMessage(
-      {
-        nonce: event.data.nonce,
-        method: "response",
-        err: "message sent to kernel with no method",
-      },
-      event.origin,
-    );
-    return;
-  }
-
-  if (event.data.method in kernelMessageHandlers) {
-    let response;
-
-    try {
-      response = await kernelMessageHandlers[event.data.method](
-        event.data.data,
-      );
-    } catch (e: any) {
-      response = { err: (e as Error).message };
-    }
-
-    (event.source as WindowProxy).postMessage(
-      {
-        nonce: event.data.nonce,
-        data: response,
-      },
-      event.origin,
-    );
-    return;
-  }
-
-  (event.source as WindowProxy).postMessage(
-    {
-      nonce: event.data.nonce,
-      method: "response",
-      err:
-        "unrecognized method (user may need to log in): " + event.data.method,
-    },
-    event.origin,
-  );
-  return;
-}
-
 window.addEventListener("message", handleIncomingMessage);
 
 boot();

src/main/bootloader/kernel.ts

@@ -15,6 +15,7 @@ import {
   setUserKey,
 } from "./vars.js";
 import { getStoredUserKey } from "./storage.js";
+import { handleIncomingMessage } from "./messages.js";
 
 export function boot() {
   let userKey;

src/main/bootloader/messages.ts

@@ -0,0 +1,72 @@
+import exchangeCommunicationKeys from "./messages/exchangeCommunicationKeys.js";
+import setLoginKey from "./messages/setLoginKey.js";
+
+const kernelMessageHandlers = {
+  exchangeCommunicationKeys,
+  setLoginKey,
+};
+
+export async function handleIncomingMessage(event: MessageEvent) {
+  if (event.source === null) {
+    return;
+  }
+  if (event.source === window) {
+    return;
+  }
+
+  if (!("nonce" in event.data)) {
+    (event.source as WindowProxy).postMessage(
+      {
+        nonce: "N/A",
+        method: "response",
+        err: "message sent to kernel with no nonce",
+      },
+      event.origin,
+    );
+    return;
+  }
+
+  if (!("method" in event.data)) {
+    (event.source as WindowProxy).postMessage(
+      {
+        nonce: event.data.nonce,
+        method: "response",
+        err: "message sent to kernel with no method",
+      },
+      event.origin,
+    );
+    return;
+  }
+
+  if (event.data.method in kernelMessageHandlers) {
+    let response;
+
+    try {
+      response = await kernelMessageHandlers[event.data.method](
+        event.data.data,
+      );
+    } catch (e: any) {
+      response = { err: (e as Error).message };
+    }
+
+    (event.source as WindowProxy).postMessage(
+      {
+        nonce: event.data.nonce,
+        data: response,
+      },
+      event.origin,
+    );
+    return;
+  }
+
+  (event.source as WindowProxy).postMessage(
+    {
+      nonce: event.data.nonce,
+      method: "response",
+      err:
+        "unrecognized method (user may need to log in): " + event.data.method,
+    },
+    event.origin,
+  );
+  return;
+}