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use std::error::Error;
use std::ffi::OsStr;
use std::fmt::{Display, Formatter};
use std::io::ErrorKind;
use std::path::{Component, Path, PathBuf, Prefix};
use log::debug;
use sha1_smol::{Digest, Sha1};
use tokio::fs::File;
use tokio::io::AsyncReadExt;
use crate::util;
#[derive(Debug)]
pub enum IntegrityError {
SizeMismatch{ expect: usize, actual: usize },
Sha1Mismatch{ expect: Digest, actual: Digest }
}
impl Display for IntegrityError {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self {
IntegrityError::SizeMismatch{ expect, actual } =>
write!(f, "size mismatch (expect {expect} bytes, got {actual} bytes)"),
IntegrityError::Sha1Mismatch {expect, actual} =>
write!(f, "sha1 mismatch (expect {expect}, got {actual})")
}
}
}
impl Error for IntegrityError {}
pub fn verify_sha1(expect: Digest, s: &str) -> Result<(), Digest> {
let dig = Sha1::from(s).digest();
if dig == expect {
return Ok(());
}
Err(dig)
}
#[derive(Debug)]
pub enum FileVerifyError {
Integrity(PathBuf, IntegrityError),
Open(PathBuf, tokio::io::Error),
Read(PathBuf, tokio::io::Error),
}
impl Display for FileVerifyError {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self {
FileVerifyError::Integrity(path, e) => write!(f, "file integrity error {}: {}", path.display(), e),
FileVerifyError::Open(path, e) => write!(f, "error opening file {}: {}", path.display(), e),
FileVerifyError::Read(path, e) => write!(f, "error reading file {}: {}", path.display(), e)
}
}
}
impl Error for FileVerifyError {
fn source(&self) -> Option<&(dyn Error + 'static)> {
match self {
FileVerifyError::Integrity(_, e) => Some(e),
FileVerifyError::Open(_, e) => Some(e),
FileVerifyError::Read(_, e) => Some(e)
}
}
}
pub async fn verify_file(path: impl AsRef<Path>, expect_size: Option<usize>, expect_sha1: Option<Digest>) -> Result<(), FileVerifyError> {
let path = path.as_ref();
if expect_size.is_none() && expect_sha1.is_none() {
debug!("No size or sha1 for {}, have to assume it's good.", path.display());
return Ok(());
}
let mut file = File::open(path).await.map_err(|e| FileVerifyError::Open(path.to_owned(), e))?;
let mut tally = 0usize;
let mut st = Sha1::new();
let mut buf = [0u8; 4096];
loop {
let n = match file.read(&mut buf).await {
Ok(n) => n,
Err(e) => match e.kind() {
ErrorKind::Interrupted => continue,
_ => return Err(FileVerifyError::Read(path.to_owned(), e))
}
};
if n == 0 {
break;
}
st.update(&buf[..n]);
tally += n;
}
let dig = st.digest();
if expect_size.is_some_and(|sz| sz != tally) {
return Err(FileVerifyError::Integrity(path.to_owned(), IntegrityError::SizeMismatch {
expect: expect_size.unwrap(),
actual: tally
}));
} else if expect_sha1.is_some_and(|exp_dig| exp_dig != dig) {
return Err(FileVerifyError::Integrity(path.to_owned(), IntegrityError::Sha1Mismatch {
expect: expect_sha1.unwrap(),
actual: dig
}));
}
Ok(())
}
pub fn check_path(name: &str) -> Result<&Path, &'static str> {
let entry_path: &Path = Path::new(name);
let mut depth = 0usize;
for component in entry_path.components() {
depth = match component {
Component::Prefix(_) | Component::RootDir =>
return Err("root path component in entry"),
Component::ParentDir => depth.checked_sub(1)
.map_or_else(|| Err("entry path escapes"), |s| Ok(s))?,
Component::Normal(_) => depth + 1,
_ => depth
}
}
Ok(entry_path)
}
#[cfg(windows)]
pub fn strip_verbatim(path: &Path) -> &Path {
let Some(Component::Prefix(p)) = path.components().next() else {
return path;
};
match p.kind() {
Prefix::VerbatimDisk(_) =>
Path::new(unsafe { OsStr::from_encoded_bytes_unchecked(&path.as_os_str().as_encoded_bytes()[4..]) }),
_ => path
}
}
#[cfg(not(windows))]
pub fn strip_verbatim(path: &Path) -> &Path {
path
}
pub trait AsJavaPath {
fn as_java_path(&self) -> &Path;
}
impl AsJavaPath for Path {
fn as_java_path(&self) -> &Path {
strip_verbatim(self)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
#[cfg(windows)]
fn test_strip_verbatim() {
let path = Path::new(r"\\?\C:\Some\Verbatim\Path");
match path.components().next().unwrap() {
Component::Prefix(p) => assert!(matches!(p.kind(), Prefix::VerbatimDisk(_)), "(TEST BUG) path does not start with verbatim disk"),
_ => panic!("(TEST BUG) path does not start with prefix")
}
let path2 = path.as_java_path();
match path2.components().next().unwrap() {
Component::Prefix(p) => assert!(matches!(p.kind(), Prefix::Disk(_))),
_ => panic!("path does not begin with prefix")
}
}
}
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