Generate pre-signed AWS S3 URLs for C# uploads and downloads.
npx skills add https://github.com/Levironexe/architect --skill aws-s3-storage-c
Please help me install this Agent Skill. Skill: AWS S3 Storage (C#) Source: https://github.com/Levironexe/architect/tree/main/skills/patterns/s3-csharp Command: npx skills add https://github.com/Levironexe/architect --skill aws-s3-storage-c
This Skill prevents unsafe and costly file-handling patterns by guiding your C# backend to generate secure pre-signed S3 URLs, validate uploads, and store only object keys for long-term maintainability.
Ask your coding agent to implement the presign and confirm endpoints plus the DI-registered StorageService using AWS SDK S3, storing only the returned object key in your database.
High-intent search queries and answers about installing and using this skill.
Generate pre-signed PUT URLs in your C# backend so clients upload files directly to S3 without proxying bytes through your server. Validate MIME types before signing and verify object existence after upload confirmation.
Storing only the S3 object key instead of the full pre-signed URL ensures long-term maintainability. You generate fresh signed download URLs on demand when responding to clients, preventing expired link issues and reducing database storage overhead.
Implement a server-side MIME allowlist validation during the presign step to block attackers from obtaining signed URLs for disallowed file types. This ensures clients can only upload approved content types directly to S3.
Require clients to call an API endpoint with the object key to confirm uploads. Your server then verifies the object exists in S3 before saving the key to your database, ensuring upload success without proxying file bytes.
Register IAmazonS3 as a singleton via dependency injection and source credentials from environment variables or IAM roles rather than hardcoding secrets. This ensures safe credential management for your C# application's S3 operations.
Pre-signed URLs require strict server-side MIME validation to prevent disallowed file uploads and necessitate an upload confirmation step to verify S3 object existence. Additionally, you must persist only object keys to avoid expired download link issues.
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