melbourne2991 · June 6, 2021 06:51 · Jun 6, 2021 · Jun 6, 2021
diff --git a/gistfile1.txt → handler.ts b/gistfile1.txt → handler.ts
diff --git a/gistfile1.txt b/gistfile1.txt
@@ -0,0 +1,63 @@
+import { NextApiRequest, NextApiResponse } from "next";
+import { StatusCodes, getReasonPhrase } from "http-status-codes";
+
+type NextHandler<R> = (req: NextApiRequest, res: NextApiResponse<R>) => void;
+
+type ResponseEnhanced<R> = {
+  status?: StatusCodes | number;
+  headers?: Record<string, string>;
+  body?: R;
+};
+
+export type TypedNextApiRequest<Q> = Omit<NextApiRequest, "query"> & {
+  query: Q;
+};
+
+type HandlerParam<R, Q> = (
+  req: TypedNextApiRequest<Q>
+) => Promise<ResponseEnhanced<R>>;
+
+type Method = "post" | "get" | "delete" | "patch" | "put";
+
+function makeHandler(method?: Method) {
+  return <Q, R>(inner: HandlerParam<R, Q>): NextHandler<R> => {
+    return (req: NextApiRequest, res: NextApiResponse) => {
+      if (method && req.method?.toLowerCase() !== method) {
+        return res.status(StatusCodes.METHOD_NOT_ALLOWED).send({
+          error: getReasonPhrase(StatusCodes.METHOD_NOT_ALLOWED),
+        });
+      }
+
+      return inner(req as NextApiRequest & { query: Q })
+        .then((_res) => {
+          const status = _res.status || StatusCodes.OK;
+          const headers = _res.headers || {};
+
+          Object.keys(headers).forEach((key) =>
+            res.setHeader(key, headers[key])
+          );
+
+          res.status(status).send(_res.body || "");
+        })
+        .catch((err) => {
+          console.log(`Uncaught error: ${err}`);
+
+          res.status(StatusCodes.INTERNAL_SERVER_ERROR).json({
+            error: getReasonPhrase(StatusCodes.INTERNAL_SERVER_ERROR),
+          });
+        });
+    };
+  };
+}
+
+const _defaultHandler = makeHandler();
+
+export function handler<Q, R>(inner: HandlerParam<R, Q>) {
+  return _defaultHandler<Q, R>(inner);
+}
+
+handler.get = makeHandler("get");
+handler.post = makeHandler("post");
+handler.delete = makeHandler("delete");
+handler.put = makeHandler("get");
+handler.patch = makeHandler("get");