NestJS - How to upload image to aws s3?

I'm trying to perform an image upload to aws s3 using multer-s3 on NestJS API. I have also tried aws-sdk. I use FileInterceptor and UploadedFile decorator to capture the file request. So far what I have is:

// Controller
 @Post()
 @UseInterceptors(FileInterceptor('file', multerOptions))
    uploadImage(@UploadedFile() file) {
        console.log(file);
    }

// multerOptions. multer.ts file
const configService = new ConfigService();

export const accessParams = {
    accessKeyId: configService.get('AWS_ACCESS_KEY_ID'),
    secretAccessKey: configService.get('AWS_SECRET_ACCESS_KEY'),
    region: configService.get('AWS_REGION'),
};

const imageMimeTypes = [
    'image/jpg',
    'image/jpeg',
    'image/png',
    'image/bmp',
];

AWS.config.update(accessParams);
export const s3 = new AWS.S3();

export const multerOptions = {
    fileFilter: (req: any, file: any, cb: any) => {
        const mimeType = imageMimeTypes.find(im => im === file.mimetype);

        if (mimeType) {
            cb(null, true);
        } else {
            cb(new HttpException(`Unsupported file type ${extname(file.originalname)}`, HttpStatus.BAD_REQUEST), false);
        }
    },
    storage: multerS3({
        s3: s3,
        bucket: configService.get('S3_BUCKET_NAME'),
        acl: 'read-public',
        metadata: function (req, file, cb) {
            cb(null, { fieldName: file.fieldname })
        },
        key: (req: any, file: any, cb: any) => {
            cb(null, `${Date.now().toString()}/${file.originalname}`);
        },
        contentType: multerS3.AUTO_CONTENT_TYPE
    }),
};

which gives me the following error:

{
  "message": null,
  "code": "InvalidArgument",
  "region": null,
  "time": "2020-04-24T05:34:19.009Z",
  "requestId": "DH224C558HTDF8E3",
  "extendedRequestId": "JKHKJH6877-LKJALDNC765llLKAL=",
  "statusCode": 400,
  "retryable": false,
  "retryDelay": 6.790294010827713,
  "storageErrors": []
}

Any idea? Thank you.

You could create a controller like

import { Post, UseInterceptors, UploadedFile } from '@nestjs/common';

@Post('upload')
@UseInterceptors(FileInterceptor('file'))
async upload(@UploadedFile() file) {
  return await this.service.upload(file);
}

Your service should look like

import { S3 } from 'aws-sdk';
import { Logger, Injectable } from '@nestjs/common';

@Injectable()
export class FileUploadService {
    async upload(file) {
        const { originalname } = file;
        const bucketS3 = 'my-aws-bucket';
        await this.uploadS3(file.buffer, bucketS3, originalname);
    }

    async uploadS3(file, bucket, name) {
        const s3 = this.getS3();
        const params = {
            Bucket: bucket,
            Key: String(name),
            Body: file,
        };
        return new Promise((resolve, reject) => {
            s3.upload(params, (err, data) => {
            if (err) {
                Logger.error(err);
                reject(err.message);
            }
            resolve(data);
            });
        });
    }

    getS3() {
        return new S3({
            accessKeyId: process.env.AWS_ACCESS_KEY_ID,
            secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
        });
    }
}