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use std::path::PathBuf;
pub async fn obtain_ferron() -> std::io::Result<PathBuf> {
let ferron_dl_dir = dirs::data_local_dir()
.ok_or(std::io::Error::new(
std::io::ErrorKind::NotFound,
"data local directory not found",
))?
.join("ferron-language-server");
if tokio::fs::try_exists(&ferron_dl_dir).await.unwrap_or(false)
|| tokio::fs::try_exists(ferron_dl_dir.join("ferron.exe"))
.await
.unwrap_or(false)
{
// Don't download again if already present
return Ok(ferron_dl_dir);
}
tokio::fs::create_dir_all(&ferron_dl_dir).await?;
// 1. Obtain the latest version info for Ferron 3 from https://dl.ferron.sh/latest3.ferron
let latest_ferron_version = reqwest::get("https://dl.ferron.sh/latest3.ferron")
.await
.map_err(std::io::Error::other)?
.error_for_status()
.map_err(std::io::Error::other)?
.text()
.await
.map_err(std::io::Error::other)?;
let latest_ferron_version = latest_ferron_version.trim();
// 2. Obtain the latest version of Ferron 3 from:
// - Windows: https://dl.ferron.sh/<version>/ferron-<version>-<targettriple>.zip
// - Others: https://dl.ferron.sh/<version>/ferron-<version>-<targettriple>.tar.gz
let ferron_url = if cfg!(windows) {
format!(
"https://dl.ferron.sh/{}/ferron-{}-{}.zip",
latest_ferron_version,
latest_ferron_version,
crate::build::BUILD_TARGET
)
} else {
format!(
"https://dl.ferron.sh/{}/ferron-{}-{}.tar.gz",
latest_ferron_version,
latest_ferron_version,
crate::build::BUILD_TARGET
)
};
let ferron_archive = reqwest::get(&ferron_url)
.await
.map_err(std::io::Error::other)?
.error_for_status()
.map_err(std::io::Error::other)?
.bytes()
.await
.map_err(std::io::Error::other)?;
// 3. Extract the archive to the download directory
#[cfg(not(windows))]
{
let mut gunzipped = async_compression::tokio::bufread::GzipDecoder::new(
std::io::Cursor::new(ferron_archive),
);
tokio_tar::Archive::new(&mut gunzipped)
.unpack(&ferron_dl_dir)
.await?;
#[cfg(unix)]
{
use std::os::unix::fs::PermissionsExt;
// Make `ferron` and `ferron-fmt` executable
if let Ok(metadata) = tokio::fs::metadata(&ferron_dl_dir.join("ferron")).await {
let mut permissions = metadata.permissions();
let old_mode = permissions.mode();
let mode_read = old_mode & 0o444;
let mode_exec = mode_read >> 2; // r--r--r-- => --x--x--x
permissions.set_mode(old_mode | mode_exec);
tokio::fs::set_permissions(&ferron_dl_dir.join("ferron"), permissions).await?;
}
if let Ok(metadata) = tokio::fs::metadata(&ferron_dl_dir.join("ferron-fmt")).await {
let mut permissions = metadata.permissions();
let old_mode = permissions.mode();
let mode_read = old_mode & 0o444;
let mode_exec = mode_read >> 2; // r--r--r-- => --x--x--x
permissions.set_mode(old_mode | mode_exec);
tokio::fs::set_permissions(&ferron_dl_dir.join("ferron-fmt"), permissions).await?;
}
}
}
#[cfg(windows)]
{
use tokio_util::compat::TokioAsyncWriteCompatExt;
let mut reader = async_zip::tokio::read::seek::ZipFileReader::with_tokio(
std::io::Cursor::new(ferron_archive),
)
.await
.map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?;
// Taken from https://github.com/Majored/rs-async-zip/blob/main/examples/file_extraction.rs
for index in 0..reader.file().entries().len() {
let Some(entry) = reader.file().entries().get(index) else {
continue;
};
let path = ferron_dl_dir.join(
entry
.filename()
.as_str()
.map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?
.replace('\\', "/")
.split('/')
.map(sanitize_filename::sanitize)
.collect::<PathBuf>(),
);
// If the filename of the entry ends with '/', it is treated as a directory.
// This is implemented by previous versions of this crate and the Python Standard Library.
// https://docs.rs/async_zip/0.0.8/src/async_zip/read/mod.rs.html#63-65
// https://github.com/python/cpython/blob/820ef62833bd2d84a141adedd9a05998595d6b6d/Lib/zipfile.py#L528
let entry_is_dir = entry
.dir()
.map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?;
let mut entry_reader = reader
.reader_without_entry(index)
.await
.map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?;
if entry_is_dir {
// The directory may have been created if iteration is out of order.
if !path.exists() {
tokio::fs::create_dir_all(&path).await.map_err(|e| {
std::io::Error::new(
std::io::ErrorKind::Other,
format!("Failed to create extracted directory: {}", e),
)
})?;
}
} else {
// Creates parent directories. They may not exist if iteration is out of order
// or the archive does not contain directory entries.
let parent = path.parent().ok_or_else(|| {
std::io::Error::new(
std::io::ErrorKind::Other,
format!(
"A file entry should have parent directories: {}",
path.display()
),
)
})?;
if !parent.is_dir() {
tokio::fs::create_dir_all(parent).await.map_err(|e| {
std::io::Error::new(
std::io::ErrorKind::Other,
format!("Failed to create parent directories: {}", e),
)
})?;
}
let writer = tokio::fs::OpenOptions::new()
.write(true)
.create_new(true)
.open(&path)
.await
.map_err(|e| {
std::io::Error::new(
std::io::ErrorKind::Other,
format!("Failed to create extracted file: {}", e),
)
})?;
futures_util::io::copy(&mut entry_reader, &mut writer.compat_write())
.await
.map_err(|e| {
std::io::Error::new(
std::io::ErrorKind::Other,
format!("Failed to copy to extracted file: {}", e),
)
})?;
// Closes the file and manipulates its metadata here if you wish to preserve its metadata from the archive.
}
}
}
Ok(ferron_dl_dir)
}