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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/>.
use crate::store::Store;
use anyhow::{Context, Result, ensure};
use std::fs::{File, OpenOptions};
use std::io::Write;
use std::net::{SocketAddr, TcpListener};
use std::os::unix::fs::OpenOptionsExt;
use std::path::Path;
pub(crate) fn lock(directory: &Path) -> Result<File> {
let file = OpenOptions::new()
.read(true)
.write(true)
.create(true)
.truncate(false)
.mode(0o600)
.open(directory.join("server.lock"))?;
file.try_lock().context(
"Chat is already running. Stop it before starting another server or resetting the owner.",
)?;
Ok(file)
}
pub(crate) fn fingerprint(store: &Store) -> Result<()> {
let certificate = store.owner()?.context("No owner identity is registered")?;
writeln!(
std::io::stdout().lock(),
"{}",
stack_chat_crypto::public_identity(&certificate)?
)?;
Ok(())
}
pub(crate) fn reset(store: &mut Store, expected: &str, address: SocketAddr) -> Result<()> {
ensure!(
address.ip().is_loopback(),
"Reset must use the local chat address"
);
let _port =
TcpListener::bind(address).context("Stop the chat server before resetting its owner")?;
store.reset_owner(expected)?;
writeln!(
std::io::stdout().lock(),
"Owner registration and chat history cleared. Restart chat and use OWNER SETUP to create a new owner file. Existing backup archives were not changed."
)?;
Ok(())
}
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