s3-upload-file/index.js

The **S3Uploader** class is a Node.js module designed to simplify the process of uploading files to Amazon S3. It utilizes the **AWS SDK**, **crypto**, **fs**, and **multer** libraries to provide a convenient interface for handling file uploads to an S3 b

const AWS = require('aws-sdk');
const { randomUUID } = require('crypto');
const fs = require('fs');
const multer = require('multer');

class S3Uploader {
  constructor(accessKeyId, secretAccessKey, region, bucketName) {
    this.s3 = new AWS.S3({
      accessKeyId: accessKeyId,
      secretAccessKey: secretAccessKey,
      region: region,
    });
    this.bucketName = bucketName;
    this.upload = multer({ dest: 'uploads/' });
  }

  uploadMiddleware() {
    return this.upload.single('file');
  }

  async uploadFile(req) {
    const fileStream = fs.createReadStream(req.path);
    let key = randomUUID();
    console.log("key", this.bucketName);
    const uploadParams = {
      Bucket: this.bucketName,
      Key: `${key}`,
      Body: fileStream,
      ContentType: req.mimetype,
    };

    return new Promise((resolve, reject) => {
      this.s3.upload(uploadParams, (err, data) => {
        if (err) {
          reject(err);
        } else {
          resolve(data.Location);
        }
      });
    });
  }
}



class S3PreSignedUrl {

    constructor(accessKeyId, secretAccessKey, region, bucketName, key) {
        this.s3 = new AWS.S3({
            accessKeyId: accessKeyId,
            secretAccessKey: secretAccessKey,
            region: region,
        });
        this.bucketName = bucketName;
        this.key = key
        this.expires = 36000;
    }

    async getSignedUrl() {
        const s3Params = {
            Bucket: this.bucketName,
            Key: this.key,
            Expires: this.expires,
        };
        try {
            return new Promise((resolve, reject) => {
                this.s3.getSignedUrl('putObject', s3Params, (err, url) => {
                    if (err) {
                        reject(err); // Reject with the error received from AWS SDK
                    } else {
                        resolve(url); // Resolve with the signed URL
                    }
                });
            });
        } catch (error) {
            throw new Error('Failed to generate signed URL: ' + error.message);
        }
    }

    //   async uploadFile(req) {
    //     const fileStream = fs.createReadStream(req.path);
    //     let key = randomUUID();
    //     console.log("key", this.bucketName);
    //     const uploadParams = {
    //       Bucket: this.bucketName,
    //       Key: `${key}`,
    //       Body: fileStream,
    //       ContentType: req.mimetype,
    //     };

    //     return new Promise((resolve, reject) => {
    //       this.s3.upload(uploadParams, (err, data) => {
    //         if (err) {
    //           reject(err);
    //         } else {
    //           resolve(data.Location);
    //         }
    //       });
    //     });
    //   }
}

// module.exports = { S3PreSignedUrl };

module.exports = { S3Uploader , S3PreSignedUrl};