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0ce31daf90
When an S3 upload has a mismatched Content-MD5 header, SeaweedFS was incorrectly returning a 500 Internal Server Error instead of the proper 400 Bad Request with error code BadDigest (per AWS S3 specification). Changes: - Created weed/util/constants/filer.go with error message constants - Added ErrMsgBadDigest constant for MD5 mismatch errors - Added ErrMsgOperationNotPermitted constant for WORM permission errors - Added ErrBadDigest error code with proper 400 status code mapping - Updated filerErrorToS3Error() to detect MD5 mismatch and return ErrBadDigest - Updated filer autoChunk() to return 400 Bad Request for MD5 mismatch - Refactored error handling to use switch statement for better readability - Ordered error checks with exact matches first for better maintainability - Updated all error handling to use centralized constants - Added comprehensive unit tests All error messages now use constants from a single location for better maintainability and consistency. Constants placed in util package to avoid architectural dependency issues. Fixes #7305