
AWS serverless services including S3, Step Functions, Lambda, DynamoDB, and Cognito enable secure file sharing with granular access controls, download limits, and comprehensive audit tracking through a complete application example.


<div><p>This article demonstrates a serverless file-sharing application using Amazon S3 and AWS Step Functions with enhanced access controls beyond standard presigned URLs.</p><ul><li>API Gateway with Cognito authentication manages user access and authorization</li><li>Step Functions orchestrates file sharing workflows including validation and permissions checks</li><li>DynamoDB stores file ownership and sharing permissions for granular access control</li><li>S3 provides central file storage with dedicated user folders</li><li>Download limits and expiration dates control data access and costs</li><li>SNS sends email notifications when files are shared with recipients</li><li>S3 Access Logs and Athena enable download tracking and bandwidth analytics</li><li>QuickSight provides admin dashboards for download reports and usage metrics</li><li>Step Functions workflows are customizable for specific business requirements</li></ul><p>The solution provides secure file sharing with granular permissions, access tracking, and analytics using AWS serverless services deployable via AWS CDK.</p></div>


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