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use std::error::Error;
use std::fmt::{Display, Formatter};
use std::{fs, io, os};
use std::fs::File;
use std::io::{BufReader, Error as IOError, Read};
use std::path::{Component, Path, PathBuf};
use log::{debug, trace};
use zip::result::ZipError;
use zip::ZipArchive;
use crate::util;
#[derive(Debug)]
pub enum ZipExtractError {
IO { what: &'static str, error: IOError },
Zip { what: &'static str, error: ZipError },
InvalidEntry { why: &'static str, name: String }
}
impl From<(&'static str, IOError)> for ZipExtractError {
fn from((what, error): (&'static str, IOError)) -> Self {
ZipExtractError::IO { what, error }
}
}
impl From<(&'static str, ZipError)> for ZipExtractError {
fn from((what, error): (&'static str, ZipError)) -> Self {
ZipExtractError::Zip { what, error }
}
}
impl Display for ZipExtractError {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self {
ZipExtractError::IO { what, error } => write!(f, "i/o error ({what}): {error}"),
ZipExtractError::Zip { what, error } => write!(f, "zip error ({what}): {error}"),
ZipExtractError::InvalidEntry { why, name } => write!(f, "invalid entry in zip file ({why}): {name}")
}
}
}
impl Error for ZipExtractError {
fn source(&self) -> Option<&(dyn Error + 'static)> {
match self {
ZipExtractError::IO { error, .. } => Some(error),
ZipExtractError::Zip { error, .. } => Some(error),
_ => None
}
}
}
fn check_entry_path(name: &str) -> Result<&Path, ZipExtractError> {
util::check_path(name).map_err(|e| ZipExtractError::InvalidEntry {
why: e,
name: name.to_owned()
})
}
#[cfg(unix)]
fn extract_symlink(path: impl AsRef<Path>, target: &str) -> io::Result<()> {
os::unix::fs::symlink(target, path)
}
#[cfg(windows)]
fn extract_symlink(path: impl AsRef<Path>, target: &str) -> io::Result<()> {
os::windows::fs::symlink_file(target, path)
}
#[cfg(not(any(unix, windows)))]
fn extract_symlink(path: impl AsRef<Path>, _target: &str) -> io::Result<()> {
warn!("Refusing to extract symbolic link to {}. I don't know how to do it on this platform!", path.as_ref().display());
Ok(())
}
pub fn extract_zip<F>(zip_path: impl AsRef<Path>, extract_root: impl AsRef<Path>, condition: F) -> Result<usize, ZipExtractError>
where
F: Fn(&str) -> bool
{
debug!("Extracting zip file {} into {}", zip_path.as_ref().display(), extract_root.as_ref().display());
fs::create_dir_all(&extract_root).map_err(|e| ZipExtractError::from(("create extract root", e)))?;
let mut extracted = 0usize;
let file = File::open(&zip_path).map_err(|e| ZipExtractError::from(("extract zip file (open)", e)))?;
let read = BufReader::new(file);
let mut archive = ZipArchive::new(read).map_err(|e| ZipExtractError::from(("read zip archive", e)))?;
// create directories
for n in 0..archive.len() {
let entry = archive.by_index(n).map_err(|e| ZipExtractError::from(("read zip entry (1)", e)))?;
if !entry.is_dir() { continue; }
let name = entry.name();
if !condition(name) {
continue;
}
let entry_path = check_entry_path(name)?;
let entry_path: PathBuf = [extract_root.as_ref(), entry_path].iter().collect();
trace!("Extracting directory {} from {}", entry.name(), zip_path.as_ref().display());
fs::create_dir_all(entry_path).map_err(|e| ZipExtractError::from(("extract directory", e)))?;
}
// extract the files
for n in 0..archive.len() {
let mut entry = archive.by_index(n).map_err(|e| ZipExtractError::from(("read zip entry (2)", e)))?;
let name = entry.name();
if entry.is_dir() { continue; }
if !condition(name) {
continue;
}
let entry_path = check_entry_path(name)?;
let entry_path: PathBuf = [extract_root.as_ref(), entry_path].iter().collect();
if entry.is_symlink() {
let mut target = String::new();
entry.read_to_string(&mut target).map_err(|e| ZipExtractError::from(("read to symlink target", e)))?;
trace!("Extracting symbolic link {} -> {} from {}", entry.name(), target, zip_path.as_ref().display());
extract_symlink(entry_path.as_path(), target.as_str()).map_err(|e| ZipExtractError::from(("extract symlink", e)))?;
} else if entry.is_file() {
let mut outfile = File::create(&entry_path).map_err(|e| ZipExtractError::from(("extract zip entry (open)", e)))?;
trace!("Extracting file {} from {}", entry.name(), zip_path.as_ref().display());
io::copy(&mut entry, &mut outfile).map_err(|e| ZipExtractError::from(("extract zip entry (write)", e)))?;
extracted += 1;
}
}
Ok(extracted)
}
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