feat(inject): Handle relative and absoule sourcemap URLs

[loewenheim]

This adds a function that should handle all forms of sourcemap URL correctly, not just the most basic ones. The logic that preserves initial ./ segments is pretty cursed though.

[kamilogorek]

We already have this resolution util in https://github.com/getsentry/sentry-cli/blob/master/src/commands/sourcemaps/explain.rs#L335 (including tests at the bottom)

[loewenheim]

Does that handle paths containing .. though?

[kamilogorek]

Yup

fn main() {
    let base = dbg!(url::Url::parse("http://example.com/a/b/c/bundle.js").unwrap());
    let map = dbg!(base.join("../../bundle.js.map").unwrap().to_string());
    assert_eq!(map, "http://example.com/a/bundle.js.map");
}

[loewenheim]

Tbh I don't see how this can work for our test cases. Our source "urls" aren't actual URLs, they're things like ./server/chunks/1.js.

[kamilogorek]

Ugh right, I forgot it's not the abs_path we're resolving to in this case, as we're collecting files locally 😔