Refactor clawx (#344)

Co-authored-by: ashione <skyzlxuan@gmail.com>

electron/api/route-utils.ts

@@ -0,0 +1,39 @@
+import type { IncomingMessage, ServerResponse } from 'http';
+
+export async function parseJsonBody<T>(req: IncomingMessage): Promise<T> {
+  const chunks: Buffer[] = [];
+  for await (const chunk of req) {
+    chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk));
+  }
+  const raw = Buffer.concat(chunks).toString('utf8').trim();
+  if (!raw) {
+    return {} as T;
+  }
+  return JSON.parse(raw) as T;
+}
+
+export function setCorsHeaders(res: ServerResponse): void {
+  res.setHeader('Access-Control-Allow-Origin', '*');
+  res.setHeader('Access-Control-Allow-Methods', 'GET,POST,PUT,DELETE,OPTIONS');
+  res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
+}
+
+export function sendJson(res: ServerResponse, statusCode: number, payload: unknown): void {
+  setCorsHeaders(res);
+  res.statusCode = statusCode;
+  res.setHeader('Content-Type', 'application/json; charset=utf-8');
+  res.end(JSON.stringify(payload));
+}
+
+export function sendNoContent(res: ServerResponse): void {
+  setCorsHeaders(res);
+  res.statusCode = 204;
+  res.end();
+}
+
+export function sendText(res: ServerResponse, statusCode: number, text: string): void {
+  setCorsHeaders(res);
+  res.statusCode = statusCode;
+  res.setHeader('Content-Type', 'text/plain; charset=utf-8');
+  res.end(text);
+}