fix(s3): normalize basePath and add README#1679
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Strip leading/trailing slashes from basePath before passing it to afero.NewBasePathFs: S3 object keys must not start with "/" and a trailing slash produces double slashes in key names. Also adds a README for the S3 backend documenting all supported params. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Follow-up to #1636 which added
basePathsupport for the S3 backend.afero.NewBasePathFs. S3 object keys must not start with/— a value like/uploadswould produce keys like/uploads/file.txt, which differs fromuploads/file.txtand breaks most S3 tooling.bucket,region,access_key_id,secret_access_key,endpoint,disable_ssl,path_style,basePath) with example configurations for AWS, MinIO, and isolated user directories.Test plan
basePath = "uploads"andbasePath = "/uploads"produce identical S3 key prefixesbasePath = "users/alice/"(trailing slash) works correctly🤖 Generated with Claude Code