Support 'file' URI schema

[DzmitrySudnik]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)

Problem

Hi,

I want to render urls which use file schema, pointing to local file system files, for example:

• file:///etc/hosts

Since URI supports file schema (RFC: https://datatracker.ietf.org/doc/html/rfc8089) and browsers open such links just fine I think it's reasonable to add support for it to react-markdown.

Thanks

Solution

I think just adding 'file' to the protocol list in https://github.com/remarkjs/react-markdown/blob/8.0.7/lib/uri-transformer.js will do it.

Alternatives

Can't think if anything more simple than adding 'file' to the protocols list.

[wooorm]

You can pass your own uri transformer?

[wooorm]

Passing your own uriTransformer is a viable alternative. It’s in my opinion also better because it does not change the behavior for every user of react-markdown ever.