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// SPDX-FileCopyrightText: 2025 Tomasz Kramkowski <tomasz@kramkow.ski>
// SPDX-License-Identifier: GPL-3.0-or-later
use std::{
collections::HashMap,
fs::File,
io::Read,
os::unix::fs::PermissionsExt,
path::Path,
process,
time::Duration,
};
use anyhow::bail;
use rumqttc::{AsyncClient, EventLoop, MqttOptions};
use serde::Deserialize;
use crate::PROGRAM;
#[derive(Deserialize, Debug)]
pub struct Credentials {
pub username: String,
pub password: String,
}
fn default_host() -> String {
"localhost".to_string()
}
fn default_port() -> u16 {
1883
}
fn default_id() -> String {
PROGRAM.to_string()
}
#[derive(Deserialize, Debug)]
pub struct Config {
#[serde(default = "default_host")]
pub host: String,
#[serde(default = "default_port")]
pub port: u16,
pub credentials: Option<Credentials>,
#[serde(default = "default_id")]
pub id: String,
// TODO: Figure out a way to allow arbitrary unix paths (arbitrary
// non-unicode) without base64
pub routes: HashMap<String, Vec<Vec<String>>>,
}
impl Config {
pub fn mqtt_client(&self) -> (AsyncClient, EventLoop) {
let client_id = format!("{}_{}", self.id, process::id());
let mut options = MqttOptions::new(client_id, &self.host, self.port);
if let Some(credentials) = &self.credentials {
options.set_credentials(&credentials.username, &credentials.password);
}
options.set_keep_alive(Duration::from_secs(5));
options.set_max_packet_size(10 * 1024 * 1024, 10 * 1024 * 1024);
AsyncClient::new(options, 10)
}
}
pub fn load<P: AsRef<Path>>(path: P) -> anyhow::Result<Config> {
let mut f = File::open(path)?;
let mut config = String::new();
f.read_to_string(&mut config)?;
let config: Config = toml::from_str(&config)?;
if config.credentials.is_some() {
let mode = f.metadata()?.permissions().mode();
if mode & 0o044 != 0o000 {
bail!("Config file contains credentials while being group or world readable.");
}
}
Ok(config)
}
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