Vizzuality/landgriffon

import { MulterOptions } from '@nestjs/platform-express/multer/interfaces/multer-options.interface';
import * as multer from 'multer';
import { v4 as uuidv4 } from 'uuid';
import * as config from 'config';
import * as path from 'path';

/**
 * Options for Multer
 */

/**
 * @note Update this type if more custom params needed
 */

declare type uploadOptions = {
  allowedFileExtension: string;
};

export const fileUploadInterceptor = (
  uploadOptions: uploadOptions,
): MulterOptions => {
  return {
    storage: multer.diskStorage({
      filename: (
        _req: any,
        file: Express.Multer.File,
        cb: (error: Error | null, filename: string) => void,
      ) => {
        cb(null, `${uuidv4()}_${file.originalname}`);
      },
      destination: config.get('fileUploads.storagePath'),
    }),
    limits: {
      fileSize: config.get('fileUploads.sizeLimit') as number,
    },
    fileFilter: function (_req: any, file: Express.Multer.File, cb: any): any {
      cb(
        null,
        path.extname(file.originalname) === uploadOptions.allowedFileExtension,
      );
    },
  };
};