forked from bot/tmp2
91 lines
2.8 KiB
Rust
91 lines
2.8 KiB
Rust
/*
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* mCaptcha - A proof of work based DoS protection system
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* Copyright © 2021 Aravinth Manivannan <realravinth@batsense.net>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//! In-memory cache implementation that uses [HashMap]
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use std::collections::HashMap;
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use actix::prelude::*;
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use super::messages::*;
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use super::Save;
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use crate::errors::*;
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use crate::pow::PoWConfig;
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#[derive(Clone, Default)]
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/// cache datastructure implementing [Save]
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pub struct HashCache(HashMap<String, u32>);
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impl HashCache {
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fn save(&mut self, config: PoWConfig) -> CaptchaResult<()> {
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self.0.insert(config.string, config.difficulty_factor);
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Ok(())
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}
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fn retrive(&mut self, string: String) -> CaptchaResult<Option<u32>> {
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if let Some(difficulty_factor) = self.0.get(&string) {
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Ok(Some(difficulty_factor.to_owned()))
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} else {
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Ok(None)
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}
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}
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}
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/* TODO cache of pow configs need to have lifetimes to prevent replay attacks
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* where lifetime = site's cool down period so that people can't generate pow
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* configs when the site is cool and use them later with rainbow tables
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* when it's under attack.
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*
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* This comment stays until this feature is implemented.
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*/
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impl Save for HashCache {}
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impl Actor for HashCache {
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type Context = Context<Self>;
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}
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/// cache a PoWConfig
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impl Handler<Cache> for HashCache {
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type Result = MessageResult<Cache>;
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fn handle(&mut self, msg: Cache, _ctx: &mut Self::Context) -> Self::Result {
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MessageResult(self.save(msg.0))
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}
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}
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/// Retrive PoW difficulty_factor for a PoW string
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impl Handler<Retrive> for HashCache {
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type Result = MessageResult<Retrive>;
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fn handle(&mut self, msg: Retrive, _ctx: &mut Self::Context) -> Self::Result {
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MessageResult(self.retrive(msg.0))
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[actix_rt::test]
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async fn hashcache_works() {
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let addr = HashCache::default().start();
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let cache: PoWConfig = PoWConfig::new(54);
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let string = cache.string.clone();
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addr.send(Cache(cache)).await.unwrap().unwrap();
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let difficulty_factor = addr.send(Retrive(string)).await.unwrap().unwrap();
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assert_eq!(difficulty_factor.unwrap(), 54);
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}
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}
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