fn canonicalize_headers()

in src/gcp/credential.rs [849:873]

• 21 lines of code
• 3 McCabe index (conditional complexity)

    fn canonicalize_headers(header_map: &HeaderMap) -> (String, String) {
        //FIXME add error handling for invalid header values
        let mut headers = BTreeMap::<String, Vec<&str>>::new();
        for (k, v) in header_map {
            headers
                .entry(k.as_str().to_lowercase())
                .or_default()
                .push(std::str::from_utf8(v.as_bytes()).unwrap());
        }

        let canonicalize_headers = headers
            .iter()
            .map(|(k, v)| {
                format!(
                    "{}:{}",
                    k.trim(),
                    v.iter().map(|v| trim_header_value(v)).join(",")
                )
            })
            .join("\n");

        let signed_headers = headers.keys().join(";");

        (canonicalize_headers, signed_headers)
    }