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|
use anyhow::{anyhow, bail, Result};
use chrono::Utc;
use serde_json::json;
use std::{process::ExitCode, time::Duration};
fn main() -> ExitCode {
let config = match Config::load() {
Ok(config) => config,
Err(e) => {
eprintln!("Error: {e}");
return ExitCode::from(2);
}
};
let (repo_name, operation) = match parse_cmdline() {
Ok(args) => args,
Err(e) => {
eprintln!("Error: {e}\n");
eprintln!("Usage: git-lfs-authenticate <REPO> upload/download");
// Exit code 2 signifies bad usage of CLI.
return ExitCode::from(2);
}
};
if !repo_exists(&repo_name) {
eprintln!("Error: repository does not exist");
return ExitCode::FAILURE;
}
let expires_at = Utc::now() + Duration::from_secs(5 * 60);
let Some(tag) = common::generate_tag(
common::Claims {
specific_claims: common::SpecificClaims::BatchApi(operation),
repo_path: &repo_name,
expires_at,
},
config.key,
) else {
eprintln!("Failed to generate validation tag");
return ExitCode::FAILURE;
};
let response = json!({
"header": {
"Authorization": format!(
"Gitolfs3-Hmac-Sha256 {tag} {}",
expires_at.timestamp()
),
},
"expires_at": expires_at.to_rfc3339_opts(chrono::SecondsFormat::Secs, true),
"href": format!("{}{}/info/lfs", config.href_base, repo_name),
});
println!("{}", response.to_string());
ExitCode::SUCCESS
}
struct Config {
href_base: String,
key: common::Key,
}
impl Config {
fn load() -> Result<Self> {
let Ok(href_base) = std::env::var("GITOLFS3_HREF_BASE") else {
bail!("configured base URL not provided");
};
if !href_base.ends_with('/') {
bail!("configured base URL does not end with a slash");
}
let Ok(key_path) = std::env::var("GITOLFS3_KEY_PATH") else {
bail!("key path not provided");
};
let key = common::load_key(&key_path).map_err(|e| anyhow!("failed to load key: {e}"))?;
Ok(Self { href_base, key })
}
}
fn parse_cmdline() -> Result<(String, common::Operation)> {
let [repo_path, op_str] = get_cmdline_args::<2>()?;
let op: common::Operation = op_str
.parse()
.map_err(|e| anyhow!("unknown operation: {e}"))?;
validate_repo_path(&repo_path).map_err(|e| anyhow!("invalid repository name: {e}"))?;
Ok((repo_path.to_string(), op))
}
fn get_cmdline_args<const N: usize>() -> Result<[String; N]> {
let args = std::env::args();
if args.len() - 1 != N {
bail!("got {} argument(s), expected {}", args.len() - 1, N);
}
// Does not allocate.
const EMPTY_STRING: String = String::new();
let mut values = [EMPTY_STRING; N];
// Skip the first element; we do not care about the program name.
for (i, arg) in args.skip(1).enumerate() {
values[i] = arg
}
Ok(values)
}
fn validate_repo_path(path: &str) -> Result<()> {
if path.len() > 100 {
bail!("too long (more than 100 characters)");
}
if path.contains("//")
|| path.contains("/./")
|| path.contains("/../")
|| path.starts_with("./")
|| path.starts_with("../")
{
bail!("contains one or more path elements '.' and '..'");
}
if path.starts_with('/') {
bail!("starts with '/', which is not allowed");
}
if !path.ends_with(".git") {
bail!("missed '.git' suffix");
}
Ok(())
}
fn repo_exists(name: &str) -> bool {
match std::fs::metadata(name) {
Ok(metadata) => metadata.is_dir(),
_ => false,
}
}
|
