106 lines
2.4 KiB
Rust
106 lines
2.4 KiB
Rust
/// Check whether a given string is a valid server name according to [the specification][].
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///
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/// [the specification]: https://matrix.org/docs/spec/appendices#server-name
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pub fn is_valid_server_name(name: &str) -> bool {
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use std::net::Ipv6Addr;
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if name.is_empty() {
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return false;
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}
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let end_of_host = if name.starts_with('[') {
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let end_of_ipv6 = match name.find(']') {
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Some(idx) => idx,
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None => return false,
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};
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if name[1..end_of_ipv6].parse::<Ipv6Addr>().is_err() {
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return false;
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}
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end_of_ipv6 + 1
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} else {
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let end_of_host = name.find(':').unwrap_or_else(|| name.len());
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if name[..end_of_host]
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.bytes()
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.any(|byte| !(byte.is_ascii_alphanumeric() || byte == b'-' || byte == b'.'))
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{
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return false;
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}
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end_of_host
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};
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if name.len() == end_of_host {
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true
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} else if name.as_bytes()[end_of_host] != b':' {
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// hostname is followed by something other than ":port"
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false
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} else {
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// are the remaining characters after ':' a valid port?
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name[end_of_host + 1..].parse::<u16>().is_ok()
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}
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}
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#[cfg(test)]
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mod tests {
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use super::is_valid_server_name;
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#[test]
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fn ipv4_host() {
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assert!(is_valid_server_name("127.0.0.1"));
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}
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#[test]
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fn ipv4_host_and_port() {
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assert!(is_valid_server_name("1.1.1.1:12000"));
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}
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#[test]
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fn ipv6() {
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assert!(is_valid_server_name("[::1]"));
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}
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#[test]
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fn ipv6_with_port() {
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assert!(is_valid_server_name("[1234:5678::abcd]:5678"));
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}
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#[test]
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fn dns_name() {
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assert!(is_valid_server_name("example.com"));
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}
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#[test]
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fn dns_name_with_port() {
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assert!(is_valid_server_name("ruma.io:8080"));
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}
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#[test]
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fn empty_string() {
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assert!(!is_valid_server_name(""));
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}
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#[test]
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fn invalid_ipv6() {
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assert!(!is_valid_server_name("[test::1]"));
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}
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#[test]
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fn ipv4_with_invalid_port() {
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assert!(!is_valid_server_name("127.0.0.1:"));
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}
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#[test]
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fn ipv6_with_invalid_port() {
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assert!(!is_valid_server_name("[fe80::1]:100000"));
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assert!(!is_valid_server_name("[fe80::1]!"));
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}
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#[test]
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fn dns_name_with_invalid_port() {
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assert!(!is_valid_server_name("matrix.org:hello"));
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}
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}
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