Function percent_decode

crates/openshell-cli/src/oidc_auth.rs:309–328

Percent-decode a URL query parameter value.

(s: &str)

/// Percent-decode a URL query parameter value.
fn percent_decode(s: &str) -> String {
    let mut out = Vec::with_capacity(s.len());
    let mut bytes = s.bytes();
    while let Some(b) = bytes.next() {
        if b == b'%' {
            let hi = bytes.next().and_then(|b| char::from(b).to_digit(16));
            let lo = bytes.next().and_then(|b| char::from(b).to_digit(16));
            if let (Some(h), Some(l)) = (hi, lo) {
                out.push(u8::try_from(h * 16 + l).unwrap_or(b'%'));
            } else {
                out.push(b'%');
            }
        } else if b == b'+' {
            out.push(b' ');
        } else {
            out.push(b);
        }
    }
    String::from_utf8(out).unwrap_or_else(|_| s.to_string())
}

/// Callback server state.
struct CallbackState {