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|
use crate::error::Error;
use crate::util::base32;
use std::fmt;
use std::path::Path;
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Debug)]
pub struct StorePath {
pub hash: StorePathHash,
pub name: StorePathName,
}
pub const STORE_PATH_HASH_BYTES: usize = 20;
pub const STORE_PATH_HASH_CHARS: usize = 32;
impl StorePath {
pub fn new(path: &Path, store_dir: &Path) -> Result<Self, Error> {
if path.parent() != Some(store_dir) {
return Err(Error::NotInStore(path.into()));
}
Self::new_from_base_name(
path.file_name()
.ok_or(Error::BadStorePath(path.into()))?
.to_str()
.ok_or(Error::BadStorePath(path.into()))?,
)
}
pub fn from_parts(hash: [u8; STORE_PATH_HASH_BYTES], name: &str) -> Result<Self, Error> {
Ok(StorePath {
hash: StorePathHash(hash),
name: StorePathName::new(name)?,
})
}
pub fn new_from_base_name(base_name: &str) -> Result<Self, Error> {
if base_name.len() < STORE_PATH_HASH_CHARS + 1
|| base_name.as_bytes()[STORE_PATH_HASH_CHARS] != '-' as u8
{
return Err(Error::BadStorePath(base_name.into()));
}
Ok(StorePath {
hash: StorePathHash::new(&base_name[0..STORE_PATH_HASH_CHARS])?,
name: StorePathName::new(&base_name[STORE_PATH_HASH_CHARS + 1..])?,
})
}
}
impl fmt::Display for StorePath {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}-{}", self.hash, self.name)
}
}
#[derive(Clone, PartialEq, Eq, Debug)]
pub struct StorePathHash([u8; STORE_PATH_HASH_BYTES]);
impl StorePathHash {
pub fn new(s: &str) -> Result<Self, Error> {
assert_eq!(s.len(), STORE_PATH_HASH_CHARS);
let v = base32::decode(s)?;
assert_eq!(v.len(), STORE_PATH_HASH_BYTES);
let mut bytes: [u8; 20] = Default::default();
bytes.copy_from_slice(&v[0..STORE_PATH_HASH_BYTES]);
Ok(Self(bytes))
}
pub fn hash<'a>(&'a self) -> &'a [u8; STORE_PATH_HASH_BYTES] {
&self.0
}
}
impl fmt::Display for StorePathHash {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut buf = vec![0; STORE_PATH_HASH_CHARS];
base32::encode_into(&self.0, &mut buf);
f.write_str(std::str::from_utf8(&buf).unwrap())
}
}
impl Ord for StorePathHash {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
// Historically we've sorted store paths by their base32
// serialization, but our base32 encodes bytes in reverse
// order. So compare them in reverse order as well.
self.0.iter().rev().cmp(other.0.iter().rev())
}
}
impl PartialOrd for StorePathHash {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
Some(self.cmp(other))
}
}
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Debug)]
pub struct StorePathName(String);
impl StorePathName {
pub fn new(s: &str) -> Result<Self, Error> {
if s.len() == 0 {
return Err(Error::StorePathNameEmpty);
}
if s.len() > 211 {
return Err(Error::StorePathNameTooLong);
}
if s.starts_with('.')
|| !s.chars().all(|c| {
c.is_ascii_alphabetic()
|| c.is_ascii_digit()
|| c == '+'
|| c == '-'
|| c == '.'
|| c == '_'
|| c == '?'
|| c == '='
})
{
return Err(Error::BadStorePathName);
}
Ok(Self(s.to_string()))
}
pub fn name<'a>(&'a self) -> &'a str {
&self.0
}
}
impl fmt::Display for StorePathName {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(&self.0)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_parse() {
let s = "7h7qgvs4kgzsn8a6rb273saxyqh4jxlz-konsole-18.12.3";
let p = StorePath::new_from_base_name(&s).unwrap();
assert_eq!(p.name.0, "konsole-18.12.3");
assert_eq!(
p.hash.0,
[
0x9f, 0x76, 0x49, 0x20, 0xf6, 0x5d, 0xe9, 0x71, 0xc4, 0xca, 0x46, 0x21, 0xab, 0xff,
0x9b, 0x44, 0xef, 0x87, 0x0f, 0x3c
]
);
}
#[test]
fn test_no_name() {
let s = "7h7qgvs4kgzsn8a6rb273saxyqh4jxlz-";
assert_matches!(
StorePath::new_from_base_name(&s),
Err(Error::StorePathNameEmpty)
);
}
#[test]
fn test_no_dash() {
let s = "7h7qgvs4kgzsn8a6rb273saxyqh4jxlz";
assert_matches!(
StorePath::new_from_base_name(&s),
Err(Error::BadStorePath(_))
);
}
#[test]
fn test_short_hash() {
let s = "7h7qgvs4kgzsn8a6rb273saxyqh4jxl-konsole-18.12.3";
assert_matches!(
StorePath::new_from_base_name(&s),
Err(Error::BadStorePath(_))
);
}
#[test]
fn test_invalid_hash() {
let s = "7h7qgvs4kgzsn8e6rb273saxyqh4jxlz-konsole-18.12.3";
assert_matches!(StorePath::new_from_base_name(&s), Err(Error::BadBase32));
}
#[test]
fn test_long_name() {
let s = "7h7qgvs4kgzsn8a6rb273saxyqh4jxlz-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
assert_matches!(StorePath::new_from_base_name(&s), Ok(_));
}
#[test]
fn test_too_long_name() {
let s = "7h7qgvs4kgzsn8a6rb273saxyqh4jxlz-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
assert_matches!(
StorePath::new_from_base_name(&s),
Err(Error::StorePathNameTooLong)
);
}
#[test]
fn test_bad_name() {
let s = "7h7qgvs4kgzsn8a6rb273saxyqh4jxlz-foo bar";
assert_matches!(
StorePath::new_from_base_name(&s),
Err(Error::BadStorePathName)
);
let s = "7h7qgvs4kgzsn8a6rb273saxyqh4jxlz-kónsole";
assert_matches!(
StorePath::new_from_base_name(&s),
Err(Error::BadStorePathName)
);
}
#[test]
fn test_roundtrip() {
let s = "7h7qgvs4kgzsn8a6rb273saxyqh4jxlz-konsole-18.12.3";
assert_eq!(StorePath::new_from_base_name(&s).unwrap().to_string(), s);
}
}
|
