reest/decorators/controller_decorators/Multer.ts

A library inspired by NestJS's elegance, specifically designed for efficient serverless API development on AWS Lambda. It streamlines the creation of microservices with automated Swagger documentation and enhanced decorator-based middleware support, makin

import { MulterOptions } from "../../types/MulterOptions";
import { RouteDefinition } from "../../types/RouteDefinition";
import multer from "multer";

export const Multer = (
  path: string,
  options?: MulterOptions
): MethodDecorator => {
  return (
    target: any,
    key: string | symbol,
    descriptor: PropertyDescriptor
  ) => {
    const upload = multer({ storage: multer.memoryStorage() });

    const type =
      typeof options?.single === "undefined" || options?.single
        ? "single"
        : "array";

    if (!Reflect.hasMetadata("routes", target.constructor)) {
      Reflect.defineMetadata("routes", [], target.constructor);
    }

    if (!Reflect.hasMetadata("multer", target.constructor)) {
      Reflect.defineMetadata(
        "multer",
        {
          path,
          options,
          type: type,
        },
        target.constructor
      );
    }

    const routes = Reflect.getMetadata(
      "routes",
      target.constructor
    ) as Array<RouteDefinition>;

    const route = routes.find((route: any) => route.methodName === key) || {
      methodName: key,
      middlewares: [],
    };

    if (route.middlewares) {
      route.middlewares.push(upload[type](path));
    } else {
      route.middlewares = [upload[type](path)];
    }

    route.multer = {
      path,
      options,
      type: type,
    };

    Reflect.defineMetadata("routes", [...routes, route], target.constructor);
  };
};