Summary

• Fixed inconsistent handling of S3 URIs with trailing slashes
• Normalized prefix processing using path.Clean() to ensure consistent path comparisons
• Extracted prefix trimming logic into a dedicated function for better maintainability

Problem

When syncing files to S3, URIs with trailing slashes (e.g., s3://bucket/prefix/) were not handled consistently with URIs without trailing slashes (e.g., s3://bucket/prefix). This caused incorrect path comparisons during sync operations, as documented in the investigation notes.

Solution

1. Normalize S3 prefixes: Use path.Clean() to normalize prefixes, removing trailing slashes and handling multiple slashes
2. Extract helper function: Created trimS3KeyPrefix() function to centralize prefix trimming logic
3. Comprehensive testing: Added extensive test coverage for edge cases including:
   • Multiple trailing slashes
   • Multiple internal slashes
   • Empty prefixes
   • Real-world examples

Test plan

• Unit tests pass for parseS3URI with various edge cases
• Unit tests pass for trimS3KeyPrefix function
• Integration tests verify correct interaction between components
• Manual testing with real S3 buckets (if needed)

Related Issues

Fixes the path comparison issues documented in the checksum investigation.

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