dyndns 0.2.0

A simple DynDNS server to update Hetzner DNS records with your dynamic IP address assigned by your Internet Service Provider (ISP).
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// SPDX-FileCopyrightText: 2023 Benedikt Bastin
//
// SPDX-License-Identifier: AGPL-3.0-or-later

#![deny(clippy::all)]

use std::{
    error::Error,
    fmt::Display,
    net::{IpAddr, Ipv4Addr, Ipv6Addr},
};

use crate::config::{DomainConfig, Zone};

pub mod hetzner;

#[derive(Debug)]
pub struct RecordNotFoundError {}

impl Error for RecordNotFoundError {}

impl Display for RecordNotFoundError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "Record not found")
    }
}

pub trait Provider {
    fn update_ip(&self, domain: String, zone: Zone, new_ip: IpAddr)
        -> Result<bool, Box<dyn Error>>;
}

pub fn update_ipv4(
    provider: &dyn Provider,
    new_ip: &Ipv4Addr,
    domain_config: &DomainConfig,
) -> Result<String, String> {
    let updated = provider.update_ip(
        domain_config.host.to_string(),
        domain_config.zone.clone(),
        IpAddr::V4(*new_ip),
    );

    match updated {
        Ok(u) => match u {
            true => Ok("Updated IPv4 successfully".to_string()),
            false => Ok("IPv4 already set correctly".to_string()),
        },
        Err(e) => Err(format!("Error: {}", e)),
    }
}

pub fn update_ipv6(
    provider: &dyn Provider,
    new_ip: &Ipv6Addr,
    domain_config: &DomainConfig,
) -> Result<String, String> {
    let updated = provider.update_ip(
        domain_config.host.to_string(),
        domain_config.zone.clone(),
        IpAddr::V6(*new_ip),
    );

    match updated {
        Ok(u) => match u {
            true => Ok("Updated IPv6 successfully".to_string()),
            false => Ok("IPv6 already set correctly".to_string()),
        },
        Err(e) => Err(format!("Error: {}", e)),
    }
}