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use rocket::{ fairing::{Fairing, Info, Kind}, http::Status, request::{self, FromRequest, Request}, Data, }; use casbin::prelude::*; use casbin::{CachedEnforcer, CoreApi, Result as CasbinResult}; use parking_lot::RwLock; use std::sync::Arc; pub struct CasbinVals { pub subject: Option<String>, pub domain: Option<String>, } impl CasbinVals { pub fn new(subject: Option<String>, domain: Option<String>) -> CasbinVals { CasbinVals { subject, domain } } } #[derive(Clone)] pub struct CasbinGuard(Option<Status>); impl<'a, 'r> FromRequest<'a, 'r> for CasbinGuard { type Error = (); fn from_request(request: &'a Request<'r>) -> request::Outcome<CasbinGuard, ()> { match *request.local_cache(|| CasbinGuard(Status::from_code(0))) { CasbinGuard(Some(Status::Ok)) => { request::Outcome::Success(CasbinGuard(Some(Status::Ok))) } CasbinGuard(Some(err_status)) => request::Outcome::Failure((err_status, ())), _ => request::Outcome::Failure((Status::BadGateway, ())), } } } #[derive(Clone)] pub struct CasbinFairing { pub enforcer: Arc<RwLock<CachedEnforcer>>, } impl CasbinFairing { pub async fn new<M: TryIntoModel, A: TryIntoAdapter>(m: M, a: A) -> CasbinResult<Self> { let enforcer: CachedEnforcer = CachedEnforcer::new(m, a).await?; Ok(CasbinFairing { enforcer: Arc::new(RwLock::new(enforcer)), }) } pub fn get_enforcer(&mut self) -> Arc<RwLock<CachedEnforcer>> { self.enforcer.clone() } pub fn set_enforcer(e: Arc<RwLock<CachedEnforcer>>) -> CasbinFairing { CasbinFairing { enforcer: e } } } impl Fairing for CasbinFairing { fn info(&self) -> Info { Info { name: "Casbin Fairing", kind: Kind::Request | Kind::Response, } } fn on_request(&self, request: &mut Request, _data: &Data) { let cloned_enforce = self.enforcer.clone(); let path = request.uri().path().to_owned(); let action = request.method().as_str().to_owned(); let (subject, domain) = match request.local_cache(|| CasbinVals { subject: None, domain: None, }) { CasbinVals { subject: Some(x), domain: Some(y), } => (Some(x.to_owned()), Some(y.to_owned())), CasbinVals { subject: Some(x), domain: None, } => (Some(x.to_owned()), None), _ => (None, None), }; if let Some(subject) = subject { if let Some(domain) = domain { let mut lock = cloned_enforce.write(); match lock.enforce_mut(vec![subject, domain, path, action]) { Ok(true) => { drop(lock); request.local_cache(|| CasbinGuard(Some(Status::Ok))); } Ok(false) => { drop(lock); request.local_cache(|| CasbinGuard(Some(Status::Forbidden))); } Err(_) => { drop(lock); request.local_cache(|| CasbinGuard(Some(Status::BadGateway))); } }; } else { let mut lock = cloned_enforce.write(); match lock.enforce_mut(vec![subject, path, action]) { Ok(true) => { drop(lock); request.local_cache(|| CasbinGuard(Some(Status::Ok))); } Ok(false) => { drop(lock); request.local_cache(|| CasbinGuard(Some(Status::Forbidden))); } Err(_) => { drop(lock); request.local_cache(|| CasbinGuard(Some(Status::BadGateway))); } }; } } else { request.local_cache(|| CasbinGuard(Some(Status::BadGateway))); } } }