meteor-slingshot

Uploads files directly from client to cloud storage, bypassing the Meteor server entirely, which reduces bandwidth and processing overhead as emphasized in the README's 'Why?' section.

Uses signed policy documents to control uploads without exposing secret keys, ensuring server-side authorization rules are enforced by cloud services like AWS S3, as detailed in the security explanation.

Allows restrictions by file type, size, user authentication, and custom metadata, enabling fine-grained control through directives and meta-context, as shown in the album example.

Provides upload progress indicators and latency compensation, allowing local file display before upload completes for better user experience, demonstrated in the progress bar and template helpers.