Actix Casbin Middleware

Casbin access control middleware for actix-web framework

Install

Add it to Cargo.toml

casbin = { version = "0.6.2", default-features = false }
actix-casbin-auth = "0.1.0"
actix-rt = "1.1.0"
actix-web = "2.0.0"

Requirement

Casbin only takes charge of permission control, so you need to implement an Authentication Middleware to identify user.

You should put actix_casbin_auth::CasbinVals which contains subject(username) and domain(optional) into Extension.

For example:

use std::cell::RefCell;
use std::pin::Pin;
use std::rc::Rc;
use std::task::{Context, Poll};

use actix_service::{Service, Transform};
use actix_web::{dev::ServiceRequest, dev::ServiceResponse, Error, HttpMessage};
use futures::future::{ok, Future, Ready};

use actix_casbin_auth::CasbinVals;


pub struct FakeAuth;

impl<S: 'static, B> Transform<S> for FakeAuth
    where
        S: Service<Request = ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
        S::Future: 'static,
        B: 'static,
{
    type Request = ServiceRequest;
    type Response = ServiceResponse<B>;
    type Error = Error;
    type InitError = ();
    type Transform = FakeAuthMiddleware<S>;
    type Future = Ready<Result<Self::Transform, Self::InitError>>;

    fn new_transform(&self, service: S) -> Self::Future {
        ok(FakeAuthMiddleware {
            service: Rc::new(RefCell::new(service)),
        })
    }
}

pub struct FakeAuthMiddleware<S> {
    service: Rc<RefCell<S>>,
}

impl<S, B> Service for FakeAuthMiddleware<S>
    where
        S: Service<Request = ServiceRequest, Response = ServiceResponse<B>, Error = Error> + 'static,
        S::Future: 'static,
        B: 'static,
{
    type Request = ServiceRequest;
    type Response = ServiceResponse<B>;
    type Error = Error;
    type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>>>>;

    fn poll_ready(&mut self, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
        self.service.poll_ready(cx)
    }

    fn call(&mut self, req: ServiceRequest) -> Self::Future {
        let mut svc = self.service.clone();

        Box::pin(async move {
            let vals = CasbinVals {
                subject: String::from("alice"),
                domain: None,
            };
            req.extensions_mut().insert(vals);
            let res = svc.call(req).await;
            res
        })
    }
}

Example

use actix_web::{web, App, HttpServer, HttpResponse};
use actix_casbin_auth::CasbinService;
use casbin::function_map::key_match2;
use casbin::CoreApi;
use casbin::{DefaultModel, FileAdapter};

#[actix_rt::main]
async fn main() -> std::io::Result<()> {
    std::env::set_var("RUST_LOG", "actix_web=debug");
    env_logger::init();
    let m = DefaultModel::from_file("examples/rbac_with_pattern_model.conf")
    .await
    .unwrap();
    let a = FileAdapter::new("examples/rbac_with_pattern_policy.csv");

    let casbin_middleware = CasbinService::new(m, a).await;

    casbin_middleware
        .write()
        .await
        .add_matching_fn(key_match2)
        .unwrap();

    HttpServer::new(move || {
        App::new()
            .wrap(casbin_middleware.clone())
            .wrap(FakeAuth)          
            .route("/pen/1", web::get().to(|| HttpResponse::Ok()))
            .route("/book/{id}", web::get().to(|| HttpResponse::Ok()))
    })
    .bind("127.0.0.1:8080")?
    .run()
    .await
}

License

This project is licensed under

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)