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use bstr::BStr;
use crate::protocol::context::Error;
mod write {
use bstr::{BStr, BString};
use crate::protocol::{context::serde::validate, Context};
impl Context {
/// Write ourselves to `out` such that [`from_bytes()`][Self::from_bytes()] can decode it losslessly.
pub fn write_to(&self, mut out: impl std::io::Write) -> std::io::Result<()> {
use bstr::ByteSlice;
fn write_key(out: &mut impl std::io::Write, key: &str, value: &BStr) -> std::io::Result<()> {
out.write_all(key.as_bytes())?;
out.write_all(b"=")?;
out.write_all(value)?;
out.write_all(b"\n")
}
for (key, value) in [("url", &self.url), ("path", &self.path)] {
if let Some(value) = value {
validate(key, value.as_slice().into())
.map_err(|err| std::io::Error::new(std::io::ErrorKind::Other, err))?;
write_key(&mut out, key, value.as_ref()).ok();
}
}
for (key, value) in [
("protocol", &self.protocol),
("host", &self.host),
("username", &self.username),
("password", &self.password),
] {
if let Some(value) = value {
validate(key, value.as_str().into())
.map_err(|err| std::io::Error::new(std::io::ErrorKind::Other, err))?;
write_key(&mut out, key, value.as_bytes().as_bstr()).ok();
}
}
Ok(())
}
/// Like [`write_to()`][Self::write_to()], but writes infallibly into memory.
pub fn to_bstring(&self) -> BString {
let mut buf = Vec::<u8>::new();
self.write_to(&mut buf).expect("infallible");
buf.into()
}
}
}
///
pub mod decode {
use std::convert::TryFrom;
use bstr::{BString, ByteSlice};
use crate::protocol::{context, context::serde::validate, Context};
/// The error returned by [`from_bytes()`][Context::from_bytes()].
#[derive(Debug, thiserror::Error)]
#[allow(missing_docs)]
pub enum Error {
#[error("Illformed UTF-8 in value of key {key:?}: {value:?}")]
IllformedUtf8InValue { key: String, value: BString },
#[error(transparent)]
Encoding(#[from] context::Error),
#[error("Invalid format in line {line:?}, expecting key=value")]
Syntax { line: BString },
}
impl Context {
/// Decode ourselves from `input` which is the format written by [`write_to()`][Self::write_to()].
pub fn from_bytes(input: &[u8]) -> Result<Self, Error> {
let mut ctx = Context::default();
for res in input.lines().take_while(|line| !line.is_empty()).map(|line| {
let mut it = line.splitn(2, |b| *b == b'=');
match (it.next().and_then(|k| k.to_str().ok()), it.next().map(|v| v.as_bstr())) {
(Some(key), Some(value)) => validate(key, value)
.map(|_| (key, value.to_owned()))
.map_err(Into::into),
_ => Err(Error::Syntax { line: line.into() }),
}
}) {
let (key, value) = res?;
match key {
"protocol" | "host" | "username" | "password" => {
if !value.is_utf8() {
return Err(Error::IllformedUtf8InValue { key: key.into(), value });
}
let value = value.to_string();
*match key {
"protocol" => &mut ctx.protocol,
"host" => &mut ctx.host,
"username" => &mut ctx.username,
"password" => &mut ctx.password,
_ => unreachable!("checked field names in match above"),
} = Some(value);
}
"url" => ctx.url = Some(value),
"path" => ctx.path = Some(value),
"quit" => {
ctx.quit = gix_config_value::Boolean::try_from(value.as_ref())
.ok()
.map(|b| b.into());
}
_ => {}
}
}
Ok(ctx)
}
}
}
fn validate(key: &str, value: &BStr) -> Result<(), Error> {
if key.contains('\0') || key.contains('\n') || value.contains(&0) || value.contains(&b'\n') {
return Err(Error::Encoding {
key: key.to_owned(),
value: value.to_owned(),
});
}
Ok(())
}
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