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// Copyright (c) The camino Contributors
// SPDX-License-Identifier: MIT OR Apache-2.0
//! Serde implementations for `Utf8Path`.
//!
//! The Serde implementations for `Utf8PathBuf` are derived, but `Utf8Path` is an unsized type which
//! the derive impls can't handle. Implement these by hand.
use crate::Utf8Path;
use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
use std::fmt;
struct Utf8PathVisitor;
impl<'a> de::Visitor<'a> for Utf8PathVisitor {
type Value = &'a Utf8Path;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a borrowed path")
}
fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E>
where
E: de::Error,
{
Ok(v.as_ref())
}
fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E>
where
E: de::Error,
{
std::str::from_utf8(v)
.map(AsRef::as_ref)
.map_err(|_| de::Error::invalid_value(de::Unexpected::Bytes(v), &self))
}
}
#[cfg(feature = "serde1")]
impl<'de: 'a, 'a> Deserialize<'de> for &'a Utf8Path {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_str(Utf8PathVisitor)
}
}
#[cfg(feature = "serde1")]
impl Serialize for Utf8Path {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
self.as_str().serialize(serializer)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::Utf8PathBuf;
use serde_bytes::ByteBuf;
#[test]
fn valid_utf8() {
let valid_utf8 = &["", "bar", "💩"];
for input in valid_utf8 {
let encode = Encode {
path: ByteBuf::from(*input),
};
let encoded = bincode::serialize(&encode).expect("encoded correctly");
assert_valid_utf8::<DecodeOwned>(input, &encoded);
assert_valid_utf8::<DecodeBorrowed>(input, &encoded);
}
}
fn assert_valid_utf8<'de, T: TestTrait<'de>>(input: &str, encoded: &'de [u8]) {
let output = bincode::deserialize::<T>(encoded).expect("valid UTF-8 should be fine");
assert_eq!(
output.path(),
input,
"for input, with {}, paths should match",
T::description()
);
}
#[test]
fn invalid_utf8() {
let invalid_utf8: &[(&[u8], _, _)] = &[
(b"\xff", 0, 1),
(b"foo\xfe", 3, 1),
(b"a\xC3\xA9 \xED\xA0\xBD\xF0\x9F\x92\xA9", 4, 1),
];
for (input, valid_up_to, error_len) in invalid_utf8 {
let encode = Encode {
path: ByteBuf::from(*input),
};
let encoded = bincode::serialize(&encode).expect("encoded correctly");
assert_invalid_utf8::<DecodeOwned>(input, &encoded, *valid_up_to, *error_len);
assert_invalid_utf8::<DecodeBorrowed>(input, &encoded, *valid_up_to, *error_len)
}
}
fn assert_invalid_utf8<'de, T: TestTrait<'de>>(
input: &[u8],
encoded: &'de [u8],
valid_up_to: usize,
error_len: usize,
) {
let error = bincode::deserialize::<T>(encoded).expect_err("invalid UTF-8 should error out");
let utf8_error = match *error {
bincode::ErrorKind::InvalidUtf8Encoding(utf8_error) => utf8_error,
other => panic!(
"for input {:?}, with {}, expected ErrorKind::InvalidUtf8Encoding, found: {}",
input,
T::description(),
other
),
};
assert_eq!(
utf8_error.valid_up_to(),
valid_up_to,
"for input {:?}, with {}, valid_up_to didn't match",
input,
T::description(),
);
assert_eq!(
utf8_error.error_len(),
Some(error_len),
"for input {:?}, with {}, error_len didn't match",
input,
T::description(),
);
}
#[derive(Serialize, Debug)]
struct Encode {
path: ByteBuf,
}
trait TestTrait<'de>: Deserialize<'de> + fmt::Debug {
fn description() -> &'static str;
fn path(&self) -> &Utf8Path;
}
#[derive(Deserialize, Debug)]
#[allow(unused)]
struct DecodeOwned {
path: Utf8PathBuf,
}
impl<'de> TestTrait<'de> for DecodeOwned {
fn description() -> &'static str {
"DecodeOwned"
}
fn path(&self) -> &Utf8Path {
&self.path
}
}
#[derive(Deserialize, Debug)]
#[allow(unused)]
struct DecodeBorrowed<'a> {
#[serde(borrow)]
path: &'a Utf8Path,
}
impl<'de> TestTrait<'de> for DecodeBorrowed<'de> {
fn description() -> &'static str {
"DecodeBorrowed"
}
fn path(&self) -> &Utf8Path {
self.path
}
}
}
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