feat: allow dynamic pasv_url depending on remote address

[vdiez]

Allow passing a function to pasv_url with the remote IP of the client, so that we can flexibly decide what is the correct passive URL to use. Useful if we want an FTP to be used from different networks (Intranet and internet for example)

[vdiez]

Hello! any chance to have this merged?

[matt-forster]

@vdiez Hi, thanks for the contribution! Just letting you know this isn't falling on deaf ears - I'll take a look!

[matt-forster]

I'd definitely like some docs included in this PR if we are going to accept this - as it would be a shadow feature otherwise.

[matt-forster]

I think, for the last thing before this is accepted (awesome work, btw) - we need to include some information in the docs.

We will want to expand this section with the fact that it can now be a function, and that the function should also take into account local connection logic if needed.

https://github.com/autovance/ftp-srv/blob/master/README.md?plain=1#L75-L77

[vdiez]

Thanks! Just added some explanations and an example which I hope clarifies the utility of this.

[matt-forster]

Looks good! Some improvement to the docs to ensure we show clear JS, and we can include JS highlighting as well!

[botovance]

🎉 This PR is included in version 4.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[vdiez]

thanks!