nom-nom-nix-gc/src/models/mod.rs

use std::collections::HashMap;
use std::fs;
use std::ops::DerefMut;
use std::sync::Arc;
use url::Url;

use anyhow::{Result, Context};
use deadpool_postgres::{Manager, ManagerConfig, Pool, RecyclingMethod};
use handlebars::Handlebars;
use serde::{Deserialize, Serialize};
use serde_json;
use tokio::sync::RwLock;
use tokio_postgres::NoTls;
use webauthn_rs::prelude::{Uuid, PasskeyRegistration, Passkey};
use webauthn_rs::{Webauthn, WebauthnBuilder};

#[derive(Deserialize, Debug, Clone)]
pub struct Configuration {
    pub url: String,
    pub db_host: Option<String>,
    pub db_port: Option<u16>,
    pub db_name: String
}


pub fn read_config(config_path: &str) -> anyhow::Result<Configuration> {
    let content = fs::read_to_string(config_path)
        .with_context(|| format!("Cannot read the configuration file at {}.", config_path))?;
    let res: Configuration = serde_json::from_str(&content)
        .context("Cannot parse JSON configuration.")?;
    Ok(res)
}

pub type DbField<T> = Arc<RwLock<T>>;

#[derive(Clone)]
pub struct Db {

    pub user_keys: DbField<HashMap<Uuid, Passkey>>,
    pub user_uuid_object: DbField<HashMap<Uuid, User>>,
}

#[derive(Clone)]
pub struct TempSession {
    pub user_registrations: Arc<RwLock<HashMap<Uuid,PendingRegistration>>>
}

#[derive(Clone)]
pub struct PendingRegistration {
    pub user: User,
    pub registration: PasskeyRegistration
}

#[derive(Serialize, Deserialize, Clone, PartialEq, Eq, Hash)]
pub struct User {
    pub user_name: String,
}

#[derive(Clone)]
pub struct AppState<'a>{
    pub webauthn: Arc<Webauthn>,
    pub db: Pool,
    pub hbs: Arc<Handlebars<'a>>,
    pub session: TempSession
}

mod embedded {
    use refinery::embed_migrations;
    embed_migrations!();
}

impl AppState<'_> {
    pub fn new(conf: Configuration) -> Self {
        let rp = "localhost";
        let rp_origin = Url::parse(&conf.url).expect("Invalid URL");
        let builder = WebauthnBuilder::new(rp, &rp_origin).expect("Invalid configuration");
        let builder = builder.rp_name("LocalHost");
        let webauthn = Arc::new(builder.build().expect("Invalid configuration"));
        let hbs = Arc::new(crate::templates::new().unwrap());
        let session: TempSession = TempSession {
            user_registrations: Arc::new(RwLock::new(HashMap::new()))
        };
        let mut pg_config = tokio_postgres::Config::new();
        pg_config.host_path(conf.db_host.unwrap().clone());
        pg_config.dbname(&conf.db_name);
        pg_config.port(conf.db_port.unwrap());
        let mgr_config = ManagerConfig {
            recycling_method: RecyclingMethod::Fast
        };
        println!("{:?}", pg_config);
        let mgr = Manager::from_config(pg_config, NoTls, mgr_config);
        let pool = Pool::builder(mgr).max_size(16).build().unwrap();

        AppState {
            webauthn,
            db: pool,
            hbs,
            session
        }
    }

    /**
    Generate a new registration uuid for the given `username` and
    saves it to the DB.
    */
    pub async fn generate_registration_link(&self, user: User) -> Result<Uuid> {
        let uuid = Uuid::new_v4();
        let mut conn = self.db.get().await?;
        let client = conn.deref_mut();
        let stmt = client.prepare_cached("INSERT INTO PendingRegistrations (id, user_name) VALUES ($1, $2)").await?;
        client.query(&stmt, &[&uuid, &user.user_name]).await?;
        Ok(uuid)
    }

    /**
    Retrieves the `User` attached to the registration `Uuid`.

    Returns `Some` `User` if it can find it, `None` if the `Uuid`
    doesn't exist in the DB.
    */
    pub async fn retrieve_registration_link(&self, uuid: Uuid) -> Result<Option<User>> {
        let mut conn = self.db.get().await?;
        let client = conn.deref_mut();
        let stmt = client.prepare_cached("SELECT user_name FROM PendingRegistrations WHERE id=$1").await?;
        let row = client.query_one(&stmt, &[&uuid]).await?;
        Ok(Some(User{ user_name: row.get(0)}))
    }

    pub async fn run_migrations(&self) -> Result<()> {
        let mut conn = self.db.get().await?;
        let client = conn.deref_mut().deref_mut();
        let report = embedded::migrations::runner().run_async(client).await?;
        println!("{:?}", report);
        Ok(())
    }


    pub async fn save_user(&self, user: &User) -> Result<()> {
        let mut conn = self.db.get().await?;
        let client = conn.deref_mut();
        let stmt = client.prepare_cached("INSERT INTO Users (user_name) VALUES ($1, $2, $3)").await?;
        let _ = client.query(&stmt, &[&user.user_name]).await?;
        Ok(())
    }

    pub async fn save_user_key(&self, uuid: &Uuid, passkey: &Passkey) -> Result<()> {
        let passkey_json: String = serde_json::to_string(&passkey)?;
        let mut conn = self.db.get().await?;
        let client = conn.deref_mut();
        let stmt = client.prepare_cached("INSERT INTO Keys (key_dump, user_id) VALUES ($1,$2)").await?;
        client.query(&stmt, &[&passkey_json, &uuid.to_string()]).await?;
        Ok(())
    }

    pub async fn get_user_keys(&self, user_uuid: &Uuid) -> Result<Vec<Result<Passkey, serde_json::Error>>> {
        let mut conn = self.db.get().await?;
        let client = conn.deref_mut();
        let stmt = client.prepare_cached("SELECT key_dump FROM Keys WHERE user_id = $1").await?;
        let res = client.query(&stmt, &[&user_uuid.to_string()]).await?;
        let res2 = res.iter().map(|row| {
                serde_json::from_str(row.get(0))
            }).collect();
        Ok(res2)
    }
}