This article discusses a pattern for securely handling file uploads in serverless architectures by using AWS Lambda and S3 presigned URLs instead of backend servers. It outlines steps to implement this solution, emphasizing security practices like checksum validation, expiration strategies, and least-privilege IAM policies. The author provides a GitHub repository with the full implementation details, including Terraform code, Lambda function (Node.js 20), test scripts, and an architecture diagram. This approach aims to reduce costs, improve reliability, and enhance scalability compared to traditional backend handling of file uploads.
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