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use std::error::Error;
use std::fmt::{Debug, Display, Formatter};
use std::fs::Permissions;
use std::io::Write;
use std::ops::AddAssign;
use std::path::{Path, PathBuf};
use log::debug;
use lzma_rs::decompress;
use reqwest::{Client, IntoUrl, RequestBuilder};
use sha1_smol::{Digest, Sha1};
use tokio::fs;
use tokio::io::AsyncWriteExt;
use tokio::fs::File;
use crate::launcher::download::Download;
use crate::launcher::jre::manifest::JavaRuntimeFile;
use crate::util;
use crate::util::IntegrityError;
use crate::version::DownloadInfo;
pub enum LzmaDownloadError {
NotAFile,
MissingURL
}
pub struct LzmaDownloadJob {
url: String,
path: PathBuf,
inflate: bool,
executable: bool,
raw_size: Option<usize>,
raw_sha1: Option<Digest>,
raw_sha1_st: Sha1,
raw_tally: usize,
stream: Option<decompress::Stream<Vec<u8>>>,
out_file: Option<File>
}
impl LzmaDownloadJob {
fn new_inflate(raw: &DownloadInfo, lzma: &DownloadInfo, exe: bool, path: PathBuf) -> Result<Self, LzmaDownloadError> {
Ok(LzmaDownloadJob {
url: lzma.url.as_ref().map_or_else(|| Err(LzmaDownloadError::MissingURL), |u| Ok(u.to_owned()))?,
path,
inflate: true,
executable: exe,
raw_size: raw.size,
raw_sha1: raw.sha1,
raw_sha1_st: Sha1::new(),
raw_tally: 0,
stream: Some(decompress::Stream::new(Vec::new())),
out_file: None
})
}
fn new_raw(raw: &DownloadInfo, exe: bool, path: PathBuf) -> Result<Self, LzmaDownloadError> {
Ok(LzmaDownloadJob {
url: raw.url.as_ref().map_or_else(|| Err(LzmaDownloadError::MissingURL), |u| Ok(u.to_owned()))?,
path,
inflate: false,
executable: exe,
raw_size: raw.size,
raw_sha1: raw.sha1,
raw_sha1_st: Sha1::new(),
raw_tally: 0,
stream: None,
out_file: None
})
}
}
impl TryFrom<(&JavaRuntimeFile, PathBuf)> for LzmaDownloadJob {
type Error = LzmaDownloadError;
fn try_from((file, path): (&JavaRuntimeFile, PathBuf)) -> Result<Self, Self::Error> {
if !file.is_file() {
return Err(LzmaDownloadError::NotAFile);
}
let JavaRuntimeFile::File { executable, downloads } = file else {
unreachable!("we just made sure this was a file");
};
match downloads.lzma.as_ref() {
Some(lzma) => LzmaDownloadJob::new_inflate(&downloads.raw, lzma, *executable, path),
None => LzmaDownloadJob::new_raw(&downloads.raw, *executable, path)
}
}
}
impl Debug for LzmaDownloadJob {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
f.debug_struct("LzmaDownloadJob")
.field("url", &self.url)
.field("path", &self.path)
.field("inflate", &self.inflate)
.finish()
}
}
impl Display for LzmaDownloadJob {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
if self.inflate {
write!(f, "download and inflate {} to {}", &self.url, self.path.display())
} else {
write!(f, "download {} to {}", &self.url, self.path.display())
}
}
}
impl Download for LzmaDownloadJob {
async fn prepare(&mut self, client: &Client) -> Result<Option<RequestBuilder>, Box<dyn Error>> {
if !util::should_download(&self.path, self.raw_size, self.raw_sha1).await? {
return Ok(None)
}
let mut options = File::options();
#[cfg(unix)]
{
options.mode(match self.executable {
true => 0o775,
_ => 0o664
});
}
let file = options.create(true).write(true).truncate(true).open(&self.path).await?;
self.out_file = Some(file);
Ok(Some(client.get(&self.url)))
}
async fn handle_chunk(&mut self, chunk: &[u8]) -> Result<(), Box<dyn Error>> {
let out_file = self.out_file.as_mut().expect("output file gone");
if let Some(ref mut stream) = self.stream {
stream.write_all(chunk)?;
let buf = stream.get_output_mut().expect("stream output missing before finish()");
out_file.write_all(buf.as_slice()).await?;
self.raw_sha1_st.update(buf.as_slice());
self.raw_tally += buf.len();
buf.truncate(0);
} else {
out_file.write_all(chunk).await?;
self.raw_sha1_st.update(chunk);
self.raw_tally += chunk.len();
}
Ok(())
}
async fn finish(&mut self) -> Result<(), Box<dyn Error>> {
let mut out_file = self.out_file.take().expect("output file gone");
if let Some(stream) = self.stream.take() {
let buf = stream.finish()?;
out_file.write_all(buf.as_slice()).await?;
self.raw_sha1_st.update(buf.as_slice());
self.raw_tally += buf.len();
}
let inf_digest = self.raw_sha1_st.digest();
if let Some(sha1) = self.raw_sha1 {
if inf_digest != sha1 {
debug!("Could not download {}: sha1 mismatch (exp {}, got {}).", self.path.display(), sha1, inf_digest);
return Err(IntegrityError::Sha1Mismatch {
expect: sha1,
actual: inf_digest
}.into());
}
}
if let Some(size) = self.raw_size {
if self.raw_tally != size {
debug!("Could not download {}: size mismatch (exp {}, got {}).", self.path.display(), size, self.raw_tally);
return Err(IntegrityError::SizeMismatch {
expect: size,
actual: self.raw_tally
}.into());
}
}
Ok(())
}
}
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