Initial import NDC_1C

llm_normalizer/backend/src/utils/http.ts

@@ -0,0 +1,46 @@
+import type { NextFunction, Request, Response } from "express";
+
+export class ApiError extends Error {
+  public readonly code: string;
+  public readonly status: number;
+  public readonly details?: unknown;
+
+  constructor(code: string, message: string, status = 400, details?: unknown) {
+    super(message);
+    this.code = code;
+    this.status = status;
+    this.details = details;
+  }
+}
+
+export function ok<T>(res: Response, payload: T): Response<T> {
+  return res.status(200).json(payload);
+}
+
+export function created<T>(res: Response, payload: T): Response<T> {
+  return res.status(201).json(payload);
+}
+
+export function errorMiddleware(err: unknown, _req: Request, res: Response, _next: NextFunction): void {
+  if (err instanceof ApiError) {
+    res.status(err.status).json({
+      ok: false,
+      error: {
+        code: err.code,
+        message: err.message,
+        details: err.details ?? null
+      }
+    });
+    return;
+  }
+
+  const fallback = err instanceof Error ? err.message : "Unknown error";
+  res.status(500).json({
+    ok: false,
+    error: {
+      code: "INTERNAL_ERROR",
+      message: fallback,
+      details: null
+    }
+  });
+}