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|
#![warn(clippy::pedantic)]
use super::{
character_classes::DIGIT,
context::Context,
error::Error,
};
struct Shared {
num_groups: usize,
octet_buffer: String,
}
enum State {
NotInOctet(Shared),
ExpectDigitOrDot(Shared),
}
impl State {
fn finalize(self) -> Result<(), Error> {
match self {
Self::NotInOctet(_) => Err(Error::TruncatedHost),
Self::ExpectDigitOrDot(state) => {
Self::finalize_expect_digit_or_dot(state)
},
}
}
fn finalize_expect_digit_or_dot(state: Shared) -> Result<(), Error> {
let mut state = state;
if !state.octet_buffer.is_empty() {
state.num_groups += 1;
if state.octet_buffer.parse::<u8>().is_err() {
return Err(Error::InvalidDecimalOctet);
}
}
match state.num_groups {
4 => Ok(()),
n if n < 4 => Err(Error::TooFewAddressParts),
_ => Err(Error::TooManyAddressParts),
}
}
fn new() -> Self {
Self::NotInOctet(Shared {
num_groups: 0,
octet_buffer: String::new(),
})
}
fn next(
self,
c: char,
) -> Result<Self, Error> {
match self {
Self::NotInOctet(state) => Self::next_not_in_octet(state, c),
Self::ExpectDigitOrDot(state) => {
Self::next_expect_digit_or_dot(state, c)
},
}
}
fn next_not_in_octet(
state: Shared,
c: char,
) -> Result<Self, Error> {
let mut state = state;
if DIGIT.contains(&c) {
state.octet_buffer.push(c);
Ok(Self::ExpectDigitOrDot(state))
} else {
Err(Error::IllegalCharacter(Context::Ipv4Address))
}
}
fn next_expect_digit_or_dot(
state: Shared,
c: char,
) -> Result<Self, Error> {
let mut state = state;
if c == '.' {
state.num_groups += 1;
if state.num_groups > 4 {
return Err(Error::TooManyAddressParts);
}
if state.octet_buffer.parse::<u8>().is_err() {
return Err(Error::InvalidDecimalOctet);
}
state.octet_buffer.clear();
Ok(Self::NotInOctet(state))
} else if DIGIT.contains(&c) {
state.octet_buffer.push(c);
Ok(Self::ExpectDigitOrDot(state))
} else {
Err(Error::IllegalCharacter(Context::Ipv4Address))
}
}
}
pub fn validate_ipv4_address<T>(address: T) -> Result<(), Error>
where
T: AsRef<str>,
{
address.as_ref().chars().try_fold(State::new(), State::next)?.finalize()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn good() {
let test_vectors = [
"0.0.0.0",
"1.2.3.0",
"1.2.3.4",
"1.2.3.255",
"1.2.255.4",
"1.255.3.4",
"255.2.3.4",
"255.255.255.255",
];
for test_vector in &test_vectors {
assert!(validate_ipv4_address(*test_vector).is_ok());
}
}
#[test]
fn bad() {
named_tuple!(
struct TestVector {
address_string: &'static str,
expected_error: Error,
}
);
let test_vectors: &[TestVector] = &[
("1.2.x.4", Error::IllegalCharacter(Context::Ipv4Address)).into(),
("1.2.3.4.8", Error::TooManyAddressParts).into(),
("1.2.3", Error::TooFewAddressParts).into(),
("1.2.3.", Error::TruncatedHost).into(),
("1.2.3.256", Error::InvalidDecimalOctet).into(),
("1.2.3.-4", Error::IllegalCharacter(Context::Ipv4Address)).into(),
("1.2.3. 4", Error::IllegalCharacter(Context::Ipv4Address)).into(),
("1.2.3.4 ", Error::IllegalCharacter(Context::Ipv4Address)).into(),
];
for test_vector in test_vectors {
let result = validate_ipv4_address(test_vector.address_string());
assert!(result.is_err(), "{}", test_vector.address_string());
assert_eq!(
*test_vector.expected_error(),
result.unwrap_err(),
"{}",
test_vector.address_string()
);
}
}
}
|
