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/* * mCaptcha - A proof of work based DoS protection system * Copyright © 2021 Aravinth Manivannan <realravinth@batsense.net> * * 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 <http://www.gnu.org/licenses/>. */ //! Cache is used to save proofof work details and nonces to prevent replay attacks //! and rainbow/dictionary attacks pub use hashcache::HashCache; use messages::*; pub mod hashcache; /// Describes actor handler trait impls that are required by a cache implementation pub trait Save: actix::Actor + actix::Handler<Retrive> + actix::Handler<Cache> + actix::Handler<DeleteString> { } pub mod messages { //! Messages that can be sent to cache data structures implementing [Save][super::Save] use actix::dev::*; use derive_builder::Builder; use serde::{Deserialize, Serialize}; use crate::errors::*; use crate::mcaptcha::AddVisitorResult; use crate::pow::PoWConfig; /// Message to cache PoW difficulty factor and string #[derive(Message, Serialize, Deserialize, Builder)] #[rtype(result = "CaptchaResult<()>")] pub struct Cache { pub string: String, pub difficulty_factor: u32, pub duration: u64, } impl Cache { pub fn new(p: &PoWConfig, v: &AddVisitorResult) -> Self { CacheBuilder::default() .string(p.string.clone()) .difficulty_factor(v.difficulty_factor) .duration(v.duration) .build() .unwrap() } } /// Message to retrive the the difficulty factor for the specified /// string from the cache #[derive(Message)] #[rtype(result = "CaptchaResult<Option<u32>>")] pub struct Retrive(pub String); /// Message to delete cached PoW difficulty factor and string /// when they expire #[derive(Message)] #[rtype(result = "CaptchaResult<()>")] pub struct DeleteString(pub String); }