yemot-recordings-backup/src/s3Client.js

Automatic backup tool for Yemot HaMashiach call recordings to Amazon S3

const AWS = require('aws-sdk');
const logger = require('./logger');
const config = require('./config');

class S3Client {
  constructor() {
    // Configure AWS SDK
    AWS.config.update({
      accessKeyId: config.aws.accessKeyId,
      secretAccessKey: config.aws.secretAccessKey,
      region: config.aws.region
    });

    this.s3 = new AWS.S3();
    this.bucket = config.aws.bucket;
  }

  /**
   * Upload file to S3
   * @param {Buffer} fileContent - File content
   * @param {string} key - S3 object key (path)
   * @returns {Promise<object>} S3 upload result
   */
  async uploadFile(fileContent, key) {
    try {
      const params = {
        Bucket: this.bucket,
        Key: key,
        Body: fileContent,
        ContentType: this.getContentType(key)
      };

      const result = await this.s3.upload(params).promise();
      logger.info(`Uploaded file to S3: ${key}`);
      return result;
    } catch (error) {
      logger.error(`Failed to upload file to S3 (${key}): ${error.message}`);
      throw error;
    }
  }

  /**
   * Check if a file exists in S3
   * @param {string} key - S3 object key
   * @returns {Promise<boolean>} True if exists
   */
  async fileExists(key) {
    try {
      await this.s3.headObject({
        Bucket: this.bucket,
        Key: key
      }).promise();
      return true;
    } catch (error) {
      if (error.code === 'NotFound') {
        return false;
      }
      throw error;
    }
  }

  /**
   * Get content type based on file extension
   * @param {string} key - File path or name
   * @returns {string} Content type
   */
  getContentType(key) {
    const ext = key.split('.').pop().toLowerCase();
    const contentTypes = {
      mp3: 'audio/mpeg',
      wav: 'audio/wav',
      ogg: 'audio/ogg',
      aac: 'audio/aac',
      m4a: 'audio/mp4',
      json: 'application/json',
      txt: 'text/plain'
    };
    
    return contentTypes[ext] || 'application/octet-stream';
  }
}

module.exports = S3Client;