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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
use serde::{Deserialize, Serialize};
#[cfg(feature = "full")]
pub mod hashcache;
#[cfg(feature = "full")]
pub mod redis;
#[derive(Serialize, Deserialize)]
pub struct AddChallenge {
pub difficulty: u32,
pub duration: u64,
pub challenge: String,
}
/// Describes actor handler trait impls that are required by a cache implementation
#[cfg(feature = "full")]
pub trait Save:
actix::Actor
+ actix::Handler<messages::RetrivePoW>
+ actix::Handler<messages::CachePoW>
+ actix::Handler<messages::DeletePoW>
+ actix::Handler<messages::CacheResult>
+ actix::Handler<messages::VerifyCaptchaResult>
+ actix::Handler<messages::DeleteCaptchaResult>
{
}
#[cfg(feature = "full")]
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 tokio::sync::oneshot::Receiver;
use crate::errors::*;
/// Message to cache PoW difficulty factor and string
#[derive(Message, Serialize, Deserialize, Builder, Clone)]
#[rtype(result = "Receiver<CaptchaResult<()>>")]
pub struct CachePoW {
/// challenge string
pub string: String,
/// Difficulty factor of mCaptcha at the time of minting this config
pub difficulty_factor: u32,
/// mCaptcha TTL
pub duration: u64,
/// Key is mCaptcha name
pub key: String,
}
/// Message to retrive the the difficulty factor for the specified
/// string from the cache
#[derive(Message)]
#[rtype(result = "Receiver<CaptchaResult<Option<CachedPoWConfig>>>")]
pub struct RetrivePoW(pub VerifyCaptchaResult);
#[derive(Clone, PartialEq, Debug, Default, Deserialize, Serialize)]
pub struct CachedPoWConfig {
/// mCaptcha name
pub key: String,
pub difficulty_factor: u32,
pub duration: u64,
}
/// Message to delete cached PoW difficulty factor and string
/// when they expire
#[derive(Message)]
#[rtype(result = "CaptchaResult<()>")]
pub struct DeletePoW(pub String);
/// Message to cache captcha result and the captcha key for which
/// it was generated
#[derive(Message, Serialize, Deserialize, Builder)]
#[rtype(result = "Receiver<CaptchaResult<()>>")]
pub struct CacheResult {
pub token: String,
/// key is mCaptcha identifier
pub key: String,
pub duration: u64,
}
impl From<CachedPoWConfig> for CacheResult {
fn from(c: CachedPoWConfig) -> Self {
use crate::utils::get_random;
CacheResultBuilder::default()
.key(c.key)
.duration(c.duration)
.token(get_random(32))
.build()
.unwrap()
}
}
/// Message to verify captcha result against
/// the stored captcha key
#[derive(Message, Clone, Deserialize, Serialize)]
#[rtype(result = "Receiver<CaptchaResult<bool>>")]
pub struct VerifyCaptchaResult {
pub token: String,
pub key: String,
}
/// Message to delete cached capthca result when it expires
#[derive(Message)]
#[rtype(result = "CaptchaResult<()>")]
pub struct DeleteCaptchaResult {
pub token: String,
}
}