ruma_identifiers_validation/
server_name.rs

1use crate::error::Error;
2
3pub fn validate(server_name: &str) -> Result<(), Error> {
4    use std::net::Ipv6Addr;
5
6    if server_name.is_empty() {
7        return Err(Error::InvalidServerName);
8    }
9
10    let end_of_host = if server_name.starts_with('[') {
11        let end_of_ipv6 = match server_name.find(']') {
12            Some(idx) => idx,
13            None => return Err(Error::InvalidServerName),
14        };
15
16        if server_name[1..end_of_ipv6].parse::<Ipv6Addr>().is_err() {
17            return Err(Error::InvalidServerName);
18        }
19
20        end_of_ipv6 + 1
21    } else {
22        #[allow(clippy::unnecessary_lazy_evaluations)]
23        let end_of_host = server_name.find(':').unwrap_or_else(|| server_name.len());
24
25        if server_name[..end_of_host]
26            .bytes()
27            .any(|byte| !(byte.is_ascii_alphanumeric() || byte == b'-' || byte == b'.'))
28        {
29            return Err(Error::InvalidServerName);
30        }
31
32        end_of_host
33    };
34
35    if server_name.len() != end_of_host
36        && (
37            // hostname is followed by something other than ":port"
38            server_name.as_bytes()[end_of_host] != b':'
39            // the remaining characters after ':' are not a valid port
40            || server_name[end_of_host + 1..].parse::<u16>().is_err()
41        )
42    {
43        Err(Error::InvalidServerName)
44    } else {
45        Ok(())
46    }
47}