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// Copyright (C) 2026 Doan Luu Duc Tai <doan@luuduct.ai>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
#![doc = "Local experimental chat server with ciphertext-only durable storage."]
mod http;
mod maintenance;
mod service;
mod store;
use anyhow::{Context, Result, ensure};
use clap::Parser;
use std::io::Write;
use std::net::SocketAddr;
use std::path::PathBuf;
use std::process::ExitCode;
#[derive(Debug, Parser)]
#[command(about = "Run the experimental private chat locally; production is not enabled")]
struct Arguments {
#[arg(long, default_value = ".")]
root: PathBuf,
#[arg(long)]
bind: Option<SocketAddr>,
#[arg(long, conflicts_with_all = ["reset_owner", "owner_fingerprint", "snapshot"])]
init: bool,
#[arg(long, value_name = "FINGERPRINT", conflicts_with_all = ["owner_fingerprint", "snapshot"], help = "Permanently clear the matching owner registration and all chat history after key loss")]
reset_owner: Option<String>,
#[arg(
long,
conflicts_with = "snapshot",
help = "Print the registered owner's public fingerprint"
)]
owner_fingerprint: bool,
#[arg(long)]
snapshot: Option<PathBuf>,
}
fn initialize(root: &std::path::Path) -> Result<()> {
let env = root.join(".env");
let existing = if env.exists() {
std::fs::read_to_string(&env)?
} else {
String::new()
};
ensure!(
!existing
.lines()
.any(|line| line.starts_with("CHAT_SETUP_TOKEN=")),
"CHAT_SETUP_TOKEN already exists"
);
let mut file = std::fs::OpenOptions::new()
.create(true)
.append(true)
.open(&env)?;
std::fs::set_permissions(&env, std::os::unix::fs::PermissionsExt::from_mode(0o600))?;
writeln!(file, "\nCHAT_SETUP_TOKEN={}", service::token()?)?;
if !existing
.lines()
.any(|line| line.starts_with("CHAT_ORIGIN="))
{
writeln!(file, "CHAT_ORIGIN=http://127.0.0.1:9080")?;
}
stack_config::initialize_public(root)
}
async fn run(arguments: Arguments) -> Result<()> {
let root = arguments.root.canonicalize()?;
if arguments.init {
return initialize(&root);
}
let configuration = stack_config::Config::load(&root)?;
let bind = arguments.bind.unwrap_or(configuration.chat_bind()?);
let data = root.join("var/data/chat");
std::fs::create_dir_all(&data)?;
std::fs::set_permissions(&data, std::os::unix::fs::PermissionsExt::from_mode(0o700))?;
let database = data.join("chat.sqlite");
let _server_lock = if arguments.snapshot.is_none() && !arguments.owner_fingerprint {
Some(maintenance::lock(&data)?)
} else {
None
};
let mut store = store::Store::open(&database)?;
std::fs::set_permissions(
&database,
std::os::unix::fs::PermissionsExt::from_mode(0o600),
)?;
if arguments.owner_fingerprint {
return maintenance::fingerprint(&store);
}
if let Some(expected) = arguments.reset_owner {
return maintenance::reset(&mut store, &expected, bind);
}
if let Some(destination) = arguments.snapshot {
store.snapshot(&destination)?;
std::fs::set_permissions(
destination,
std::os::unix::fs::PermissionsExt::from_mode(0o600),
)?;
return Ok(());
}
ensure!(
bind.ip().is_loopback(),
"Experimental server must bind to loopback"
);
let origin = configuration.value("CHAT_ORIGIN")?;
ensure!(
origin == format!("http://{bind}"),
"CHAT_ORIGIN must match the loopback CHAT_BIND or --bind address"
);
let setup = configuration
.value("CHAT_SETUP_TOKEN")
.context("Run --init to configure chat")?;
let state = service::Service::new(store, origin.to_owned(), setup.to_owned());
let listener = tokio::net::TcpListener::bind(bind).await?;
writeln!(
std::io::stdout().lock(),
"Experimental chat: {origin} (owner setup: /#setup)"
)?;
http::serve(listener, state, &root, configuration.public_values(None)?).await
}
#[tokio::main]
async fn main() -> ExitCode {
match run(Arguments::parse()).await {
Ok(()) => ExitCode::SUCCESS,
Err(error) => {
drop(writeln!(
std::io::stderr().lock(),
"Chat server failed: {error:#}"
));
ExitCode::FAILURE
}
}
}
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