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#![cfg(any(target_os = "macos", target_os = "windows"))]
//! This module implements the flow of downloading and verifying the app.
use std::{ffi::OsString, path::PathBuf, time::Duration};
use tokio::{process::Command, time::timeout};
use crate::{
fetch::{self, ProgressUpdater},
verify::{AppVerifier, Sha256Verifier},
};
#[derive(Debug, thiserror::Error)]
pub enum DownloadError {
#[error("Failed to download app")]
FetchApp(#[source] anyhow::Error),
#[error("Failed to verify app")]
Verification(#[source] anyhow::Error),
#[error("Failed to launch app")]
Launch(#[source] std::io::Error),
#[error("Installer exited with error: {0}")]
InstallExited(std::process::ExitStatus),
#[error("Installer failed on child.wait(): {0}")]
InstallFailed(std::io::Error),
}
/// Parameters required to construct an [AppDownloader].
#[derive(Clone)]
pub struct AppDownloaderParameters<AppProgress> {
pub app_version: mullvad_version::Version,
pub app_url: String,
pub app_size: usize,
pub app_progress: AppProgress,
pub app_sha256: [u8; 32],
/// Directory to store the installer in.
/// Ensure that this has proper permissions set.
pub cache_dir: PathBuf,
}
/// See the [module-level documentation](self).
#[async_trait::async_trait]
pub trait AppDownloader: Send {
/// Download the app binary.
async fn download_executable(&mut self) -> Result<(), DownloadError>;
/// Verify the app signature.
async fn verify(&mut self) -> Result<(), DownloadError>;
/// Execute installer.
async fn install(&mut self) -> Result<(), DownloadError>;
}
/// How long to wait for the installer to exit before returning
const INSTALLER_STARTUP_TIMEOUT: Duration = Duration::from_millis(500);
/// Download the app and signature, and verify the app's signature
pub async fn install_and_upgrade(mut downloader: impl AppDownloader) -> Result<(), DownloadError> {
downloader.download_executable().await?;
downloader.verify().await?;
downloader.install().await
}
#[derive(Clone)]
pub struct HttpAppDownloader<AppProgress> {
params: AppDownloaderParameters<AppProgress>,
}
impl<AppProgress> HttpAppDownloader<AppProgress> {
pub fn new(params: AppDownloaderParameters<AppProgress>) -> Self {
Self { params }
}
}
impl<AppProgress: ProgressUpdater> From<AppDownloaderParameters<AppProgress>>
for HttpAppDownloader<AppProgress>
{
fn from(parameters: AppDownloaderParameters<AppProgress>) -> Self {
HttpAppDownloader::new(parameters)
}
}
#[async_trait::async_trait]
impl<AppProgress: ProgressUpdater> AppDownloader for HttpAppDownloader<AppProgress> {
async fn download_executable(&mut self) -> Result<(), DownloadError> {
let bin_path = self.bin_path();
fetch::get_to_file(
bin_path,
&self.params.app_url,
&mut self.params.app_progress,
fetch::SizeHint::Exact(self.params.app_size),
)
.await
.map_err(DownloadError::FetchApp)
}
async fn verify(&mut self) -> Result<(), DownloadError> {
let bin_path = self.bin_path();
let hash = self.hash_sha256();
match Sha256Verifier::verify(&bin_path, *hash)
.await
.map_err(DownloadError::Verification)
{
// Verification succeeded
Ok(()) => Ok(()),
// Verification failed
Err(err) => {
// Attempt to clean up
let _ = tokio::fs::remove_file(bin_path).await;
Err(err)
}
}
}
async fn install(&mut self) -> Result<(), DownloadError> {
let launch_path = self.launch_path();
// Launch process
let mut cmd = Command::new(launch_path);
cmd.args(self.launch_args());
let mut child = cmd.spawn().map_err(DownloadError::Launch)?;
// Wait to see if the installer fails
match timeout(INSTALLER_STARTUP_TIMEOUT, child.wait()).await {
// Timeout: Quit and let the installer take over
Err(_timeout) => Ok(()),
// No timeout: Incredibly quick but successful (or wrong exit code, probably)
Ok(Ok(status)) if status.success() => Ok(()),
// Installer exited with error code
Ok(Ok(status)) => Err(DownloadError::InstallExited(status)),
// `child.wait()` returned an error
Ok(Err(err)) => Err(DownloadError::InstallFailed(err)),
}
}
}
impl<AppProgress> HttpAppDownloader<AppProgress> {
fn bin_path(&self) -> PathBuf {
#[cfg(windows)]
let bin_filename = format!("mullvad-{}.exe", self.params.app_version);
#[cfg(target_os = "macos")]
let bin_filename = format!("mullvad-{}.pkg", self.params.app_version);
self.params.cache_dir.join(bin_filename)
}
fn launch_path(&self) -> PathBuf {
#[cfg(target_os = "windows")]
{
self.bin_path()
}
#[cfg(target_os = "macos")]
{
use std::path::Path;
Path::new("/usr/bin/open").to_owned()
}
}
fn launch_args(&self) -> Vec<OsString> {
#[cfg(target_os = "windows")]
{
vec![]
}
#[cfg(target_os = "macos")]
{
vec![self.bin_path().into()]
}
}
fn hash_sha256(&self) -> &[u8; 32] {
&self.params.app_sha256
}
}
|
