Question 1

How do I add custom user authentication to ftpserverlib?

Accepted Answer

Implement the AuthUser method in your MainDriver interface to validate credentials; you can integrate with databases or LDAP. The library passes ClientContext for session-specific data, allowing flexible auth logic.

Question 2

ftpserverlib vs goftp/server: which is better for a Go FTP server?

Accepted Answer

ftpserverlib offers more modern features like TLS and IPv6 support with a cleaner API, but goftp/server might be simpler for basic use. Choose ftpserverlib for standards compliance and extensibility; goftp/server for quick, minimal setups.

Question 3

Does ftpserverlib support resuming file uploads?

Accepted Answer

Yes, it supports the REST command for resuming interrupted transfers, both for uploads and downloads, as part of its RFC 3659 extensions. You need to handle file offsets in your driver implementation.

Question 4

How to configure passive mode port ranges in ftpserverlib?

Accepted Answer

Set the PassiveTransferPortRange in the Settings struct to define a port range for data connections. If not specified, it uses random ports, but you must ensure firewall rules allow these ports.

Question 5

Can ftpserverlib work with cloud storage like AWS S3?

Accepted Answer

Yes, by implementing a ClientDriver using afero with an S3 adapter, such as third-party afero-S3 libraries. This maps FTP operations to S3 API calls, though you may need to handle S3-specific quirks.

Question 6

What logging options does ftpserverlib provide?

Accepted Answer

It uses Go's standard log/slog for structured logging, allowing you to integrate with JSON output or third-party loggers. You can enable debug mode per connection via ClientContext for detailed command tracing.

ftpserverlib

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