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|
use std::convert::TryFrom;
use super::character_classes::{
HEXDIG,
IPV_FUTURE_LAST_PART,
REG_NAME_NOT_PCT_ENCODED,
};
use super::context::Context;
use super::error::Error;
use super::percent_encoded_character_decoder::PercentEncodedCharacterDecoder;
use super::validate_ipv6_address::validate_ipv6_address;
struct Shared {
host: Vec<u8>,
host_is_reg_name: bool,
ipv6_address: String,
pec_decoder: PercentEncodedCharacterDecoder,
port_string: String,
}
enum State {
NotIpLiteral(Shared),
PercentEncodedCharacter(Shared),
Ipv6Address(Shared),
IpvFutureNumber(Shared),
IpvFutureBody(Shared),
GarbageCheck(Shared),
Port(Shared),
}
impl State{
fn finalize(self) -> Result<(Vec<u8>, Option<u16>), Error> {
match self {
Self::PercentEncodedCharacter(_)
| Self::Ipv6Address(_)
| Self::IpvFutureNumber(_)
| Self::IpvFutureBody(_) => {
// truncated or ended early
Err(Error::TruncatedHost)
},
Self::NotIpLiteral(state)
| Self::GarbageCheck(state)
| Self::Port(state) => {
let mut state = state;
if state.host_is_reg_name {
state.host.make_ascii_lowercase();
}
let port = if state.port_string.is_empty() {
None
} else {
match state.port_string.parse::<u16>() {
Ok(port) => {
Some(port)
},
Err(error) => {
return Err(Error::IllegalPortNumber(error));
}
}
};
Ok((state.host, port))
},
}
}
fn new(host_port_string: &str) -> (Self, &str) {
let mut shared = Shared{
host: Vec::<u8>::new(),
host_is_reg_name: false,
ipv6_address: String::new(),
pec_decoder: PercentEncodedCharacterDecoder::new(),
port_string: String::new(),
};
let mut host_port_string = host_port_string;
if host_port_string.starts_with("[v") {
host_port_string = &host_port_string[2..];
shared.host.push(b'v');
(
Self::IpvFutureNumber(shared),
host_port_string
)
} else if host_port_string.starts_with('[') {
host_port_string = &host_port_string[1..];
(
Self::Ipv6Address(shared),
host_port_string
)
} else {
shared.host_is_reg_name = true;
(
Self::NotIpLiteral(shared),
host_port_string
)
}
}
fn next(self, c: char) -> Result<Self, Error> {
match self {
Self::NotIpLiteral(state) => Self::next_not_ip_literal(state, c),
Self::PercentEncodedCharacter(state) => Self::next_percent_encoded_character(state, c),
Self::Ipv6Address(state) => Self::next_ipv6_address(state, c),
Self::IpvFutureNumber(state) => Self::next_ipv_future_number(state, c),
Self::IpvFutureBody(state) => Self::next_ipv_future_body(state, c),
Self::GarbageCheck(state) => Self::next_garbage_check(state, c),
Self::Port(state) => Self::next_port(state, c),
}
}
fn next_not_ip_literal(state: Shared, c: char) -> Result<Self, Error> {
let mut state = state;
if c == '%' {
Ok(Self::PercentEncodedCharacter(state))
} else if c == ':' {
Ok(Self::Port(state))
} else if REG_NAME_NOT_PCT_ENCODED.contains(&c) {
state.host.push(u8::try_from(c as u32).unwrap());
Ok(Self::NotIpLiteral(state))
} else {
Err(Error::IllegalCharacter(Context::Host))
}
}
fn next_percent_encoded_character(state: Shared, c: char) -> Result<Self, Error> {
let mut state = state;
if let Some(ci) = state.pec_decoder.next(c)? {
state.host.push(ci);
Ok(Self::NotIpLiteral(state))
} else {
Ok(Self::PercentEncodedCharacter(state))
}
}
fn next_ipv6_address(state: Shared, c: char) -> Result<Self, Error> {
let mut state = state;
if c == ']' {
validate_ipv6_address(&state.ipv6_address)?;
state.host = state.ipv6_address.chars().map(
|c| u8::try_from(c as u32).unwrap()
).collect();
Ok(Self::GarbageCheck(state))
} else {
state.ipv6_address.push(c);
Ok(Self::Ipv6Address(state))
}
}
fn next_ipv_future_number(state: Shared, c: char) -> Result<Self, Error> {
let mut state = state;
if c == '.' {
state.host.push(b'.');
Ok(Self::IpvFutureBody(state))
} else if c == ']' {
Err(Error::TruncatedHost)
} else if HEXDIG.contains(&c) {
state.host.push(u8::try_from(c as u32).unwrap());
Ok(Self::IpvFutureNumber(state))
} else {
Err(Error::IllegalCharacter(Context::IpvFuture))
}
}
fn next_ipv_future_body(state: Shared, c: char) -> Result<Self, Error> {
let mut state = state;
if c == ']' {
Ok(Self::GarbageCheck(state))
} else if IPV_FUTURE_LAST_PART.contains(&c) {
state.host.push(u8::try_from(c as u32).unwrap());
Ok(Self::IpvFutureBody(state))
} else {
Err(Error::IllegalCharacter(Context::IpvFuture))
}
}
fn next_garbage_check(state: Shared, c: char) -> Result<Self, Error> {
// illegal to have anything else, unless it's a colon,
// in which case it's a port delimiter
if c == ':' {
Ok(Self::Port(state))
} else {
Err(Error::IllegalCharacter(Context::Host))
}
}
fn next_port(state: Shared, c: char) -> Result<Self, Error> {
let mut state = state;
state.port_string.push(c);
Ok(Self::Port(state))
}
}
pub fn parse_host_port<T>(host_port_string: T) -> Result<(Vec<u8>, Option<u16>), Error>
where T: AsRef<str>
{
let (machine, host_port_string) = State::new(host_port_string.as_ref());
host_port_string
.chars()
.try_fold(machine, |machine, c| {
machine.next(c)
})?
.finalize()
}
|
