How can permissions be specified for fs extension?

[Datron]

Hi,

This is an amazing crate! Solves so many problems I was facing when using deno_core directly. I'm wondering how I can specify permissions for the fs feature in rustyscript. There is no example for it and I couldn't find an option in RuntimeOptions (there is web_permissions but no fs_permissions).

[utyfua]

I have not dive deep but you try filesystem?

rustyscript::RuntimeOptions {
     extension_options: rustyscript::ExtensionOptions {
          filesystem: <instance of deno_fs::FileSystemRc>
          <...>
     }
     <...>
}

[Datron]

@utyfua I took a look, FileSystemRc has the type: pub type FileSystemRc = MaybeArc<dyn FileSystem> . The FileSystem trait defined here seems quite complex to implement. I'm hoping there is an easier solution before I try to implement this trait fully.

[Datron]

I figured it out, you can use AllowlistWebPermissions:

let runtime_permissions = Arc::new(AllowlistWebPermissions::default());
    runtime_permissions.allow_open(
        <file_path>,
        true,
        false,
    );

Earlier I tried allow_read and that didn't work but allow_open does.

[rscarson]

Sorry I didn't reply earlier! Yes you can use the built in permission struct or build your own:

https://rscarson.github.io/rustyscript-book/advanced/permissions.html

[Datron]

@rscarson thanks for the response! No worries about the late reply.
This maybe tangential - but how do I grant read/write access to files in a directory? Its not clear when to use allow_read, allow_open and allow_write.

[rscarson]

You will need to open permissions for both and then either read or write for that file

The default allow list permissions only operate on a file by file basis so you will need to implement the trait yourself if you want to apply it to an entire directory