- Update docstring for optional MD5-APR1/BCRYPT support via passlib.
- Support the "md5" and "bcrypt" htpasswd_encryption config values.
- Conditionally import the required passlib components if either
"md5" or "bcrypt" is requested in the configuration file.
- Test bcrypt backend availability upon import.
- First define verification functions, then conditionally import
external dependencies.
- Consolidate: use context manager for reading credential file.
- Consolidate: save one call to strip() while parsing.
- Consolidate: break long lines, clarify comments and docstrings.
- Consolidate: use verification function mapping for improving maintainability.
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