fn string_to_sign()

in src/azure/credential.rs [476:504]

• 27 lines of code
• 1 McCabe index (conditional complexity)

fn string_to_sign(h: &HeaderMap, u: &Url, method: &Method, account: &str) -> String {
    // content length must only be specified if != 0
    // this is valid from 2015-02-21
    let content_length = h
        .get(&CONTENT_LENGTH)
        .map(|s| s.to_str())
        .transpose()
        .ok()
        .flatten()
        .filter(|&v| v != "0")
        .unwrap_or_default();
    format!(
        "{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}{}",
        method.as_ref(),
        add_if_exists(h, &CONTENT_ENCODING),
        add_if_exists(h, &CONTENT_LANGUAGE),
        content_length,
        add_if_exists(h, &CONTENT_MD5),
        add_if_exists(h, &CONTENT_TYPE),
        add_if_exists(h, &DATE),
        add_if_exists(h, &IF_MODIFIED_SINCE),
        add_if_exists(h, &IF_MATCH),
        add_if_exists(h, &IF_NONE_MATCH),
        add_if_exists(h, &IF_UNMODIFIED_SINCE),
        add_if_exists(h, &RANGE),
        canonicalize_header(h),
        canonicalize_resource(account, u)
    )
}