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use core::net::IpAddr;
use rocket::fairing::AdHoc;
use rocket::form::Form;
use rocket::http::{Cookie, CookieJar, Status};
use rocket::outcome::{try_outcome, IntoOutcome};
use rocket::request::{FromRequest, Outcome, Request};
use rocket::response::status::Unauthorized;
use rocket::serde::json::{self, Json};
use rocket::serde::{Deserialize, Serialize};
use rocket::State;
use std::collections::BTreeMap;
use std::sync::Mutex;
use std::time::Instant;
use time::Duration;
use crate::api_model;
#[derive(FromForm)]
struct Login<'r> {
username: &'r str,
password: &'r str,
}
#[derive(Debug, Deserialize)]
#[allow(dead_code)]
struct AuthConfig {
session_max_age_days: u32,
}
struct SessionsData {
active_ids: BTreeMap<u32, Instant>,
next_id: u32,
}
struct Sessions {
data: Mutex<SessionsData>,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct Session {
pub user_id: u64,
session_id: u32,
remote: String,
}
#[derive(Debug)]
pub enum SessionError {
Invalid,
}
const SESSION_COOKIE: &str = "s";
fn validate(sessions: &State<Sessions>, session: &Session, request: &Request<'_>) -> bool {
match request.client_ip() {
Some(addr) => {
if session.remote == addr.to_string() {
{
let sessions_data = sessions.data.lock().unwrap();
match sessions_data.active_ids.get(&session.session_id) {
// We could remove the expired session here, but it will be cleaned
// next time anyone logs in anyway.
Some(&expire) => expire > Instant::now(),
None => false,
}
}
} else {
false
}
}
None => false,
}
}
#[rocket::async_trait]
impl<'r> FromRequest<'r> for Session {
type Error = SessionError;
async fn from_request(request: &'r Request<'_>) -> Outcome<Session, SessionError> {
let sessions = try_outcome!(request
.guard::<&State<Sessions>>()
.await
.map_error(|_| (Status::Unauthorized, SessionError::Invalid)));
request
.cookies()
.get_private(SESSION_COOKIE)
.and_then(|cookie| -> Option<Session> { json::from_str(cookie.value()).ok() })
.and_then(|session| {
if validate(&sessions, &session, request) {
Some(session)
} else {
None
}
})
.or_error((Status::Unauthorized, SessionError::Invalid))
}
}
fn new_session(
sessions: &State<Sessions>,
user_id: u64,
remote: String,
max_age: Duration,
) -> Session {
let session_id;
{
let mut sessions_data = sessions.data.lock().unwrap();
session_id = sessions_data.next_id;
sessions_data.next_id += 1;
let now = Instant::now();
// Remove expired sessions first
sessions_data
.active_ids
.retain(|_, &mut expire| expire > now);
sessions_data.active_ids.insert(session_id, now + max_age);
}
Session {
user_id: user_id,
session_id: session_id,
remote: remote,
}
}
#[post("/login", data = "<login>")]
fn login(
auth_config: &State<AuthConfig>,
sessions: &State<Sessions>,
ipaddr: IpAddr,
cookies: &CookieJar<'_>,
login: Form<Login<'_>>,
) -> Result<Json<api_model::StatusResponse>, Unauthorized<&'static str>> {
if login.username == "user" && login.password == "password" {
let max_age = Duration::days(i64::from(auth_config.session_max_age_days));
let session = new_session(&sessions, 1u64, ipaddr.to_string(), max_age);
let cookie = Cookie::build((SESSION_COOKIE, json::to_string(&session).unwrap()))
.path("/api")
.max_age(max_age)
.http_only(true)
.build();
cookies.add_private(cookie);
Ok(Json(api_model::StatusResponse {
ok: true,
error: None,
}))
} else {
Err(Unauthorized("Unknown username or password"))
}
}
#[get("/logout")]
fn logout(
session: Session,
sessions: &State<Sessions>,
cookies: &CookieJar<'_>,
) -> Json<api_model::StatusResponse> {
{
let mut sessions_data = sessions.data.lock().unwrap();
sessions_data.active_ids.remove(&session.session_id);
}
let cookie = Cookie::build((SESSION_COOKIE, ""))
.path("/api")
.http_only(true)
.build();
cookies.remove_private(cookie);
Json(api_model::StatusResponse {
ok: true,
error: None,
})
}
#[get("/status")]
fn status(_session: Session) -> Json<api_model::StatusResponse> {
Json(api_model::StatusResponse {
ok: true,
error: None,
})
}
#[catch(401)]
fn unauthorized() -> Json<api_model::StatusResponse> {
Json(api_model::StatusResponse {
ok: false,
error: Some("Unauthorized".to_string()),
})
}
pub fn stage(basepath: String) -> AdHoc {
AdHoc::on_ignite("Auth Stage", |rocket| async {
rocket
.manage(Sessions {
data: Mutex::new(SessionsData {
active_ids: BTreeMap::new(),
next_id: 1,
}),
})
.attach(AdHoc::config::<AuthConfig>())
.mount(basepath.clone(), routes![login, logout, status])
.register(basepath, catchers![unauthorized])
})
}
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