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// -------------------------------------------------------------
// Alkane :: Services :: Validation
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Project: Nasqueron
// License: BSD-2-Clause
// Description: Input validation for site names
// -------------------------------------------------------------
use idna::domain_to_ascii_strict;
/// Determines whether a site name has valid hostname syntax.
///
/// Internationalized domain names can be supplied as Unicode or punycode.
/// Validation uses their ASCII representation for DNS label and length limits,
/// but the original spelling remains the site name used for filesystem paths.
pub fn is_valid_site_name(site_name: &str) -> bool {
if site_name.is_empty()
|| site_name.ends_with('.')
|| site_name.contains('/')
|| site_name.contains('\\')
{
return false;
}
domain_to_ascii_strict(site_name).is_ok_and(|ascii_site_name| ascii_site_name.len() <= 253)
}
// -------------------------------------------------------------
// Tests
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn accepts_ascii_hostnames_and_idns() {
assert!(is_valid_site_name("foo.example.org"));
assert!(is_valid_site_name("EXAMPLE.org"));
assert!(is_valid_site_name("bücher.example"));
assert!(is_valid_site_name("xn--bcher-kva.example"));
}
#[test]
fn rejects_invalid_hostname_syntax() {
assert!(!is_valid_site_name(""));
assert!(!is_valid_site_name("example..org"));
assert!(!is_valid_site_name("-example.org"));
assert!(!is_valid_site_name("example-.org"));
assert!(!is_valid_site_name("example_org"));
assert!(!is_valid_site_name("example.org."));
assert!(!is_valid_site_name("hello world.example"));
assert!(!is_valid_site_name("../example.org"));
assert!(!is_valid_site_name("/example.org"));
assert!(!is_valid_site_name("example.org/../foo"));
assert!(!is_valid_site_name(r"example.org\foo"));
assert!(!is_valid_site_name(&format!("{}.org", "a".repeat(64))));
assert!(!is_valid_site_name(&"a".repeat(254)));
}
}

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