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// SPDX-FileCopyrightText: 2025 Tomasz Kramkowski <tomasz@kramkow.ski>
// SPDX-License-Identifier: GPL-3.0-or-later
use std::{
collections::HashMap, fmt, fs::File, io::Read, os::unix::fs::PermissionsExt, path::Path,
process, time::Duration,
};
use anyhow::bail;
use rumqttc::{AsyncClient, EventLoop, MqttOptions, QoS};
use serde::{
de::{self, Visitor},
Deserialize, Deserializer,
};
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_qos() -> QoS {
QoS::ExactlyOnce
}
fn default_id() -> String {
PROGRAM.to_string()
}
fn default_timeout() -> Duration {
Duration::from_secs(60)
}
#[allow(clippy::enum_variant_names)]
#[derive(Deserialize, Debug)]
#[serde(remote = "QoS", rename_all = "kebab-case")]
#[repr(u8)]
pub enum QoSDef {
AtMostOnce = 0,
AtLeastOnce = 1,
ExactlyOnce = 2,
}
pub fn deserialize_qos_opt<'de, D>(deserializer: D) -> Result<Option<QoS>, D::Error>
where
D: Deserializer<'de>,
{
#[derive(Deserialize)]
struct Helper(#[serde(with = "QoSDef")] QoS);
let helper = Option::deserialize(deserializer)?;
Ok(helper.map(|Helper(external)| external))
}
#[derive(Debug)]
pub struct Route {
// TODO: Figure out a way to allow arbitrary unix paths (arbitrary
// non-unicode) without base64
pub programs: Vec<Vec<String>>,
pub qos: Option<QoS>,
}
impl<'de> Deserialize<'de> for Route {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
struct VecOrRoute;
impl<'de> Visitor<'de> for VecOrRoute {
type Value = Route;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("map or seq")
}
fn visit_seq<A>(self, seq: A) -> Result<Self::Value, A::Error>
where
A: serde::de::SeqAccess<'de>,
{
let vec: Vec<Vec<String>> =
Deserialize::deserialize(de::value::SeqAccessDeserializer::new(seq))?;
Ok(Route {
programs: vec,
qos: None,
})
}
fn visit_map<A>(self, map: A) -> Result<Self::Value, A::Error>
where
A: serde::de::MapAccess<'de>,
{
#[derive(Deserialize)]
struct RouteHelper {
programs: Vec<Vec<String>>,
#[serde(default, deserialize_with = "deserialize_qos_opt")]
qos: Option<QoS>,
}
let helper: RouteHelper =
Deserialize::deserialize(de::value::MapAccessDeserializer::new(map))?;
Ok(Route {
programs: helper.programs,
qos: helper.qos,
})
}
}
deserializer.deserialize_any(VecOrRoute)
}
}
pub fn deserialize_timeout<'de, D>(deserializer: D) -> Result<Duration, D::Error>
where
D: Deserializer<'de>,
{
struct DurationVisitor;
impl<'de> de::Visitor<'de> for DurationVisitor {
type Value = Duration;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a positive number")
}
fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
where
E: de::Error,
{
if v < 0 {
return Err(de::Error::invalid_value(
de::Unexpected::Signed(v),
&"a non-negative number",
));
}
if v == 0 {
Ok(Duration::MAX)
} else {
Ok(Duration::from_secs(v as u64))
}
}
fn visit_f64<E>(self, v: f64) -> Result<Self::Value, E>
where
E: de::Error,
{
if v < 0.0 {
return Err(de::Error::invalid_value(
de::Unexpected::Float(v),
&"a non-negative number",
));
}
if v == 0.0 {
Ok(Duration::MAX)
} else {
Ok(Duration::from_secs_f64(v))
}
}
}
deserializer.deserialize_any(DurationVisitor)
}
#[derive(Deserialize, Debug)]
pub struct Config {
#[serde(default = "default_host")]
pub host: String,
#[serde(default = "default_port")]
pub port: u16,
#[serde(with = "QoSDef", default = "default_qos")]
pub qos: QoS,
#[serde(default = "default_timeout", deserialize_with = "deserialize_timeout")]
pub timeout: Duration,
pub credentials: Option<Credentials>,
#[serde(default = "default_id")]
pub id: String,
pub routes: HashMap<String, Route>,
}
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);
}
// TODO: Make configurable
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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