Nestjs S3 example provider

nestjs_s3_provider.ts

import { Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import AWS from 'aws-sdk';

@Injectable()
export class S3Provider {
  private s3: AWS.S3;
  private bucket: string;
  private folder: string;

  constructor(private configService: ConfigService) {
    this.s3 = new AWS.S3({
      accessKeyId: this.configService.get<string>('AWS_ACCESS_KEY_ID'),
      secretAccessKey: this.configService.get<string>('AWS_SECRET_KEY'),
      region: this.configService.get<string>('AWS_REGION'),
    });
    this.bucket = this.configService.get<string>('AWS_S3_BUCKET_NAME');
    this.folder = this.configService.get<string>('AWS_S3_BUCKET_FOLDER');
  }

  async uploadObject(keyName: string, file: Buffer, mimeType: string) {
    const params = {
      Bucket: this.bucket,
      Key: this.folder + '/' + keyName,
      Body: file,
      ContentType: mimeType,
    };
    return await this.s3.upload(params).promise();
  }

  async deleteObject(keyName: string) {
    const params = {
      Bucket: this.bucket,
      Key: this.folder + '/' + keyName,
    };
    return await this.s3.deleteObject(params).promise();
  }

  async updateObject(keyName: string, file: Buffer, mimeType: string) {
    const params = {
      Bucket: this.bucket,
      Body: file,
      Key: this.folder + '/' + keyName,
      ContentType: mimeType,
    };
    return await this.s3.putObject(params).promise();
  }
}