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use std::{fmt, net, str};
use super::parser::{HostExprLanguage, Pair, Parser, Rule};
#[derive(Clone, Debug, PartialEq)]
pub enum Addr {
Domain(String),
IP(net::IpAddr),
}
impl fmt::Display for Addr {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
match self {
Addr::Domain(domain) => domain.fmt(fmt),
Addr::IP(ip) => ip.fmt(fmt),
}
}
}
impl<'a> TryFrom<Pair<'a, Rule>> for Addr {
type Error = ConversionError;
fn try_from(pair: Pair<'a, Rule>) -> Result<Self, Self::Error> {
if matches!(pair.as_rule(), Rule::addr) {
let addr = pair
.into_inner()
.next()
.expect("grammar guarantees specific inner address");
Ok(match addr.as_rule() {
Rule::ipv4_addr => Addr::IP(
addr.as_str()
.parse::<net::Ipv4Addr>()
.expect("grammar guarantees legal IPv4 address")
.into(),
),
Rule::ipv6_addr => Addr::IP(
addr.as_str()
.parse::<net::Ipv6Addr>()
.expect("grammar guarantees legal IPv6 address")
.into(),
),
Rule::domain_addr => {
let domain = addr.as_str().to_owned();
if addr.as_str().len() > 253
|| addr.into_inner().any(|l| l.as_str().len() > 63)
{
return Err(ConversionError);
}
Addr::Domain(domain)
}
_ => unreachable!(
"grammar guarantees IPv6, IPv4, or domain address"
),
})
} else {
Err(ConversionError)
}
}
}
#[derive(Clone, Copy, Debug, PartialEq, thiserror::Error)]
#[error("failed to convert into address")]
pub struct ConversionError;
impl str::FromStr for Addr {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
HostExprLanguage::parse(Rule::addr_expr, s)
.map_err(|_| ParseError)?
.next()
.expect("grammar guaranteed addr_expr")
.into_inner()
.next()
.expect("grammar guarantees addr")
.try_into()
.map_err(|_| ParseError)
}
}
#[derive(Clone, Copy, Debug, PartialEq, thiserror::Error)]
#[error("failed to parse address")]
pub struct ParseError;
#[cfg(test)]
mod test {
use super::*;
#[test]
fn parse_domain_name() {
let d = |s: &str| Ok(Addr::Domain(s.to_string()));
assert_eq!("localhost".parse(), d("localhost"));
assert_eq!("localhost.".parse(), d("localhost."));
assert_eq!("a.b.c.d".parse(), d("a.b.c.d"));
assert_eq!("a1.b-2.c--3.d---4".parse(), d("a1.b-2.c--3.d---4"));
}
#[test]
fn parse_ipv4_address() {
let ip4 =
|a, b, c, d| Ok(Addr::IP(net::Ipv4Addr::new(a, b, c, d).into()));
assert_eq!("0.0.0.0".parse(), ip4(0, 0, 0, 0));
assert_eq!("1.2.3.4".parse(), ip4(1, 2, 3, 4));
assert_eq!("255.255.255.255".parse(), ip4(255, 255, 255, 255));
}
#[test]
fn parse_ipv6_address() {
let ip6 = |a, b, c, d, e, f, g, h| {
Ok(Addr::IP(net::Ipv6Addr::new(a, b, c, d, e, f, g, h).into()))
};
assert_eq!("[::]".parse(), ip6(0, 0, 0, 0, 0, 0, 0, 0));
assert_eq!("[::1]".parse(), ip6(0, 0, 0, 0, 0, 0, 0, 1));
assert_eq!("[1::]".parse(), ip6(1, 0, 0, 0, 0, 0, 0, 0));
assert_eq!("[::0.0.0.0]".parse(), ip6(0, 0, 0, 0, 0, 0, 0, 0));
assert_eq!(
"[DEAD::BEEF]".parse(),
ip6(0xDEAD, 0, 0, 0, 0, 0, 0, 0xBEEF)
);
assert_eq!(
"[dead::beef]".parse(),
ip6(0xDEAD, 0, 0, 0, 0, 0, 0, 0xBEEF)
);
assert_eq!(
"[1:23:456:789a::127.0.0.1]".parse(),
ip6(0x0001, 0x0023, 0x0456, 0x789A, 0, 0, 0x7F00, 1),
);
}
#[test]
fn parse_bad_address() {
let err = Err(ParseError);
assert_eq!(" 1.2.3.4".parse::<Addr>(), err);
assert_eq!("".parse::<Addr>(), err);
assert_eq!(".".parse::<Addr>(), err);
assert_eq!("01.2.3.4".parse::<Addr>(), err);
assert_eq!("1. 2.3.4".parse::<Addr>(), err);
assert_eq!("1.2.3.04".parse::<Addr>(), err);
assert_eq!("1.2.3.256".parse::<Addr>(), err);
assert_eq!("1.2.3.4 ".parse::<Addr>(), err);
assert_eq!("1.2.3.4.com".parse::<Addr>(), err);
assert_eq!("1.com".parse::<Addr>(), err);
assert_eq!("[ ::]".parse::<Addr>(), err);
assert_eq!("[:: ]".parse::<Addr>(), err);
assert_eq!("[]".parse::<Addr>(), err);
assert_eq!("dash-.com".parse::<Addr>(), err);
assert_eq!("tyre.8bar.com".parse::<Addr>(), err);
assert_eq!("1".parse(), err);
assert_eq!("1.2".parse(), err);
assert_eq!("1.2.3".parse(), err);
}
}
