# data.rs - source
Source of the Rust file `src/data.rs`.
Keywords: rust, rustlang, rust-lang

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    /*
     * Copyright (C) 2021  Aravinth Manivannan <realaravinth@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 <https://www.gnu.org/licenses/>.
     */
    //! App data: redis cache, database connections, etc.
    use std::sync::Arc;
    use std::thread;

    use actix::prelude::*;
    use argon2_creds::{Config, ConfigBuilder, PasswordPolicy};
    use lettre::transport::smtp::authentication::Mechanism;
    use lettre::{
        transport::smtp::authentication::Credentials, AsyncSmtpTransport, Tokio1Executor,
    };
    use libmcaptcha::cache::hashcache::HashCache;
    use libmcaptcha::cache::redis::RedisCache;
    use libmcaptcha::master::redis::master::Master as RedisMaster;
    use libmcaptcha::redis::RedisConfig;
    use libmcaptcha::{
        cache::messages::VerifyCaptchaResult,
        cache::Save,
        errors::CaptchaResult,
        master::messages::{AddSite, RemoveCaptcha, Rename},
        master::{embedded::master::Master as EmbeddedMaster, Master as MasterTrait},
        pow::ConfigBuilder as PoWConfigBuilder,
        pow::PoWConfig,
        pow::Work,
        system::{System, SystemBuilder},
    };
    use sqlx::postgres::PgPoolOptions;
    use sqlx::PgPool;

    use crate::SETTINGS;

    /// Represents mCaptcha cache and master system.
    /// When Redis is configured, [SystemGroup::Redis] is used and
    /// in its absense, [SystemGroup::Embedded] is used
    pub enum SystemGroup {
        Embedded(System<HashCache, EmbeddedMaster>),
        Redis(System<RedisCache, RedisMaster>),
    }

    impl SystemGroup {
        /// utility function to get difficulty factor of site `id` and cache it
        pub async fn get_pow(&self, id: String) -> Option<PoWConfig> {
            match self {
                Self::Embedded(val) => val.get_pow(id).await,
                Self::Redis(val) => val.get_pow(id).await,
            }
        }

        /// utility function to verify [Work]
        pub async fn verify_pow(&self, work: Work) -> CaptchaResult<String> {
            match self {
                Self::Embedded(val) => val.verify_pow(work).await,
                Self::Redis(val) => val.verify_pow(work).await,
            }
        }

        /// utility function to validate verification tokens
        pub async fn validate_verification_tokens(
            &self,
            msg: VerifyCaptchaResult,
        ) -> CaptchaResult<bool> {
            match self {
                Self::Embedded(val) => val.validate_verification_tokens(msg).await,
                Self::Redis(val) => val.validate_verification_tokens(msg).await,
            }
        }

        /// utility function to AddSite
        pub async fn add_site(&self, msg: AddSite) -> CaptchaResult<()> {
            match self {
                Self::Embedded(val) => val.master.send(msg).await?,
                Self::Redis(val) => val.master.send(msg).await?,
            };
            Ok(())
        }

        /// utility function to rename captcha
        pub async fn rename(&self, msg: Rename) -> CaptchaResult<()> {
            match self {
                Self::Embedded(val) => val.master.send(msg).await?,
                Self::Redis(val) => val.master.send(msg).await?,
            };
            Ok(())
        }

        /// utility function to remove captcha
        pub async fn remove(&self, msg: RemoveCaptcha) -> CaptchaResult<()> {
            match self {
                Self::Embedded(val) => val.master.send(msg).await?,
                Self::Redis(val) => val.master.send(msg).await?,
            };
            Ok(())
        }

        fn new_system<A: Save, B: MasterTrait>(m: Addr<B>, c: Addr<A>) -> System<A, B> {
            let pow = PoWConfigBuilder::default()
                .salt(SETTINGS.pow.salt.clone())
                .build()
                .unwrap();

            SystemBuilder::default().pow(pow).cache(c).master(m).build()
        }

        // read settings, if Redis is configured then produce a Redis mCaptcha cache
        // based SystemGroup
        async fn new() -> Self {
            match &SETTINGS.redis {
                Some(val) => {
                    let master = RedisMaster::new(RedisConfig::Single(val.url.clone()))
                        .await
                        .unwrap()
                        .start();
                    let cache = RedisCache::new(RedisConfig::Single(val.url.clone()))
                        .await
                        .unwrap()
                        .start();
                    let captcha = Self::new_system(master, cache);

                    SystemGroup::Redis(captcha)
                }
                None => {
                    let master = EmbeddedMaster::new(SETTINGS.pow.gc).start();
                    let cache = HashCache::default().start();
                    let captcha = Self::new_system(master, cache);

                    SystemGroup::Embedded(captcha)
                }
            }
        }
    }

    /// App data
    pub struct Data {
        /// databse pool
        pub db: PgPool,
        /// credential management configuration
        pub creds: Config,
        /// mCaptcha system: Redis cache, etc.
        pub captcha: SystemGroup,
        /// email client
        pub mailer: Option<Mailer>,
    }

    impl Data {
        pub fn get_creds() -> Config {
            ConfigBuilder::default()
                .username_case_mapped(true)
                .profanity(true)
                .blacklist(true)
                .password_policy(PasswordPolicy::default())
                .build()
                .unwrap()
        }
        #[cfg(not(tarpaulin_include))]
        /// create new instance of app data
        pub async fn new() -> Arc<Self> {
            let creds = Self::get_creds();
            let c = creds.clone();

            let init = thread::spawn(move || {
                log::info!("Initializing credential manager");
                c.init();
                log::info!("Initialized credential manager");
            });

            let db = PgPoolOptions::new()
                .max_connections(SETTINGS.database.pool)
                .connect(&SETTINGS.database.url)
                .await
                .expect("Unable to form database pool");

            let data = Data {
                creds,
                db,
                captcha: SystemGroup::new().await,
                mailer: Self::get_mailer(),
            };

            #[cfg(not(debug_assertions))]
            init.join().unwrap();

            Arc::new(data)
        }

        fn get_mailer() -> Option<Mailer> {
            if let Some(smtp) = SETTINGS.smtp.as_ref() {
                let creds =
                    Credentials::new(smtp.username.to_string(), smtp.password.to_string()); // "smtp_username".to_string(), "smtp_password".to_string());

                let mailer: Mailer =
                    AsyncSmtpTransport::<Tokio1Executor>::builder_dangerous(&smtp.url)
                        .port(smtp.port)
                        .credentials(creds)
                        .authentication(vec![
                            Mechanism::Login,
                            Mechanism::Xoauth2,
                            Mechanism::Plain,
                        ])
                        .build();

                //            let mailer: Mailer = AsyncSmtpTransport::<Tokio1Executor>::relay(&smtp.url) //"smtp.gmail.com")
                //                .unwrap()
                //                .credentials(creds)
                //                .build();
                Some(mailer)
            } else {
                None
            }
        }
    }

    /// Mailer data type AsyncSmtpTransport<Tokio1Executor>
    pub type Mailer = AsyncSmtpTransport<Tokio1Executor>;