asar 0.3.0

A crate to read and write asar archives, often used by Electron apps.
Documentation 
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// SPDX-License-Identifier: Apache-2.0 OR MIT
use super::args::ExtractArgs;
use asar::AsarReader;
use color_eyre::{eyre::WrapErr, Result};
use std::fs;

pub fn extract(args: ExtractArgs, read_unpacked: bool) -> Result<()> {
	let file = fs::read(&args.archive)
		.wrap_err_with(|| format!("failed to open archive {}", args.archive.display()))?;
	let asar_path = if read_unpacked {
		Some(args.archive)
	} else {
		None
	};
	let reader = AsarReader::new(&file, asar_path).wrap_err("failed to read archive")?;
	for path in reader.directories().keys() {
		let out_path = args.destination.join(path);
		if !out_path.starts_with(&args.destination) {
			panic!("asar archive attempted to escape destination");
		}
		if !out_path.exists() {
			fs::create_dir_all(&out_path)
				.wrap_err_with(|| format!("failed to write directory {}", out_path.display()))?;
		}
	}
	for (path, file) in reader.files() {
		let out_path = args.destination.join(path);
		if !out_path.starts_with(&args.destination) {
			panic!("asar archive attempted to escape destination");
		}
		fs::write(&out_path, file.data())
			.wrap_err_with(|| format!("failed to write file {}", out_path.display()))?;
	}
	for (path, link) in reader.symlinks() {
		let out_path = args.destination.join(path);
		let out_link = args.destination.join(link);
		if !out_path.starts_with(&args.destination) || !out_link.starts_with(&args.destination) {
			panic!("asar archive attempted to escape destination");
		}
		#[cfg(unix)]
		{
			std::os::unix::fs::symlink(out_link, &out_path).wrap_err_with(|| {
				format!("failed to write symbolic link {}", out_path.display())
			})?;
		}
		#[cfg(windows)]
		{
			std::os::windows::fs::symlink_file(out_link, &out_path).wrap_err_with(|| {
				format!("failed to write symbolic link {}", out_path.display())
			})?;
		}
	}

	Ok(())
}