signed-url-management

To generate secure presigned URLs for S3 object storage, you create time-limited signed links that bind ContentType and enforce strict TTL limits. This allows direct client uploads and downloads without exposing storage credentials or requiring proxy servers.

A presigned URL is a time-limited link granting temporary access to S3-compatible object storage. You need it when providing clients direct upload or download capabilities without sharing permanent security credentials or proxying data through your application.

You can enforce presigned URL expiration using strict TTL limits and revocation strategies. This skill supports immediate revocation and per-tenant validation, ensuring compromised signed URLs for S3 storage are invalidated before their natural lifetime ends.

Presigned URL signing works with any S3-compatible object storage, not just AWS. The generation process uses standard S3 signing algorithms, enabling time-limited upload and download flows across compatible platforms while maintaining per-request scoping.

To bind ContentType validation to presigned upload URLs, you enforce content type restrictions during URL generation. This security constraint ensures clients can only upload files matching the specified MIME type to your S3-compatible object storage.

Security limitations of presigned URLs for downloads include potential leakage before expiration. Mitigate this using short TTL limits, per-request URL signing, per-tenant validation, rotation strategies, and auditing to ensure governed access to object storage.