use crate::error::Error;
pub fn validate(server_name: &str) -> Result<(), Error> {
use std::net::Ipv6Addr;
if server_name.is_empty() {
return Err(Error::InvalidServerName);
}
let end_of_host = if server_name.starts_with('[') {
let end_of_ipv6 = match server_name.find(']') {
Some(idx) => idx,
None => return Err(Error::InvalidServerName),
};
if server_name[1..end_of_ipv6].parse::<Ipv6Addr>().is_err() {
return Err(Error::InvalidServerName);
}
end_of_ipv6 + 1
} else {
#[allow(clippy::unnecessary_lazy_evaluations)]
let end_of_host = server_name.find(':').unwrap_or_else(|| server_name.len());
if server_name[..end_of_host]
.bytes()
.any(|byte| !(byte.is_ascii_alphanumeric() || byte == b'-' || byte == b'.'))
{
return Err(Error::InvalidServerName);
}
end_of_host
};
if server_name.len() != end_of_host
&& (
server_name.as_bytes()[end_of_host] != b':'
|| server_name[end_of_host + 1..].parse::<u16>().is_err()
)
{
Err(Error::InvalidServerName)
} else {
Ok(())
}
}