[SOLVED] Is there a way to pass a custom file path to warp::fs::file?

Is there a way to pass a custom file path to warp::fs::file?

I'd like to build a custom path, then download a file at that path. Eg,

        warp::path!("files" / u32)
            .map(|fileId| {
                format!("{}.txt", *FILES_PATH, fileId)
            })
            .and(warp::fs::file)

But I get an error like:

the trait bound 'fn(_) -> 
    impl warp::filter::FilterClone {
      warp::filters::fs::file::<_>
    }: warp::filter::FilterBase' is not satisfied

Am I missing an easy way that this can be done?

Solution

In warp, filters cannot be dynamically generated, they must be created when the program starts up. There is a pull request to support this, but it hasn't seen activity in a while.

Your best option is to copy Warp's implementation of file paths - it uses Warp-internal code, so you'd have to define your own error and rejection types, but that's not too difficult.