Fixing the middleware multiple calls panic

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "actix-web-httpauth"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["svartalf <self@svartalf.info>"]
 description = "HTTP authentication schemes for actix-web"
 readme = "README.md"
@@ -15,8 +15,9 @@ edition = "2018"
 
 [dependencies]
 actix-web = { version = "^1.0", default_features = false }
-futures = "0.1"
 actix-service = "0.4.0"
+futures = "0.1"
+futures-locks = "0.3.3"
 bytes = "0.4"
 base64 = "0.10"
 

README.md

@@ -2,7 +2,7 @@
 
 [![Latest Version](https://img.shields.io/crates/v/actix-web-httpauth.svg)](https://crates.io/crates/actix-web-httpauth)
 [![Latest Version](https://docs.rs/actix-web-httpauth/badge.svg)](https://docs.rs/actix-web-httpauth)
-[![dependency status](https://deps.rs/crate/actix-web-httpauth/0.3.0/status.svg)](https://deps.rs/crate/actix-web-httpauth/0.3.0)
+[![dependency status](https://deps.rs/crate/actix-web-httpauth/0.3.1/status.svg)](https://deps.rs/crate/actix-web-httpauth/0.3.1)
 ![Build Status](https://travis-ci.org/svartalf/actix-web-httpauth.svg?branch=master)
 ![Apache 2.0 OR MIT licensed](https://img.shields.io/badge/license-Apache2.0%2FMIT-blue.svg)
 

examples/middleware.rs

@@ -0,0 +1,27 @@
+use actix_web::dev::ServiceRequest;
+use actix_web::{middleware, web, App, Error, HttpServer};
+
+use futures::future;
+
+use actix_web_httpauth::extractors::basic::BasicAuth;
+use actix_web_httpauth::middleware::HttpAuthentication;
+
+fn validator(
+    req: ServiceRequest,
+    _credentials: BasicAuth,
+) -> future::FutureResult<ServiceRequest, Error> {
+    future::ok(req)
+}
+
+fn main() -> std::io::Result<()> {
+    HttpServer::new(|| {
+        let auth = HttpAuthentication::basic(validator);
+        App::new()
+            .wrap(middleware::Logger::default())
+            .wrap(auth)
+            .service(web::resource("/").to(|| "Test\r\n"))
+    })
+    .bind("127.0.0.1:8080")?
+    .workers(1)
+    .run()
+}

src/middleware.rs

@@ -1,13 +1,14 @@
 //! HTTP Authentication middleware.
 
 use std::marker::PhantomData;
-use std::rc::Rc;
+use std::sync::Arc;
 
 use actix_service::{Service, Transform};
 use actix_web::dev::{ServiceRequest, ServiceResponse};
 use actix_web::Error;
 use futures::future::{self, FutureResult};
 use futures::{Async, Future, IntoFuture, Poll};
+use futures_locks::Mutex;
 
 use crate::extractors::{basic, bearer, AuthExtractor};
 
@@ -21,11 +22,12 @@ use crate::extractors::{basic, bearer, AuthExtractor};
 /// the parsed credentials into it.
 /// In case of successful validation `F` callback
 /// is required to return the `ServiceRequest` back.
+#[derive(Debug, Clone)]
 pub struct HttpAuthentication<T, F>
 where
     T: AuthExtractor,
 {
-    process_fn: Rc<F>,
+    process_fn: Arc<F>,
     _extractor: PhantomData<T>,
 }
 
@@ -40,7 +42,7 @@ where
     /// validation callback `F`.
     pub fn with_fn(process_fn: F) -> HttpAuthentication<T, F> {
         HttpAuthentication {
-            process_fn: Rc::new(process_fn),
+            process_fn: Arc::new(process_fn),
             _extractor: PhantomData,
         }
     }
@@ -140,7 +142,7 @@ where
 
     fn new_transform(&self, service: S) -> Self::Future {
         future::ok(AuthenticationMiddleware {
-            service: Some(service),
+            service: Mutex::new(service),
             process_fn: self.process_fn.clone(),
             _extractor: PhantomData,
         })
@@ -152,8 +154,8 @@ pub struct AuthenticationMiddleware<S, F, T>
 where
     T: AuthExtractor,
 {
-    service: Option<S>,
-    process_fn: Rc<F>,
+    service: Mutex<S>,
+    process_fn: Arc<F>,
     _extractor: PhantomData<T>,
 }
 
@@ -176,23 +178,24 @@ where
 
     fn poll_ready(&mut self) -> Poll<(), Self::Error> {
         self.service
-            .as_mut()
+            .try_lock()
             .expect("AuthenticationMiddleware was called already")
             .poll_ready()
     }
 
     fn call(&mut self, req: Self::Request) -> Self::Future {
         let process_fn = self.process_fn.clone();
-        let mut service = self
-            .service
-            .take()
-            .expect("AuthenticationMiddleware was called twice");
+        // Note: cloning the mutex, not the service itself
+        let inner = self.service.clone();
 
         let f = Extract::new(req)
-            .and_then(move |(req, credentials)| {
-                (process_fn)(req, credentials)
-            })
-            .and_then(move |req| service.call(req));
+            .and_then(move |(req, credentials)| (process_fn)(req, credentials))
+            .and_then(move |req| {
+                inner
+                    .lock()
+                    .map_err(Into::into)
+                    .and_then(|mut service| service.call(req))
+            });
 
         Box::new(f)
     }

src/utils.rs

@@ -26,24 +26,20 @@ impl<'a> Iterator for Quoted<'a> {
 
     fn next(&mut self) -> Option<Self::Item> {
         match self.state {
-            State::YieldStr => {
-                match self.inner.next() {
+            State::YieldStr => match self.inner.next() {
                 Some(s) => {
                     self.state = State::YieldQuote;
                     Some(s)
-                    },
-                    None => None,
                 }
+                None => None,
             },
-            State::YieldQuote => {
-                match self.inner.peek() {
+            State::YieldQuote => match self.inner.peek() {
                 Some(_) => {
                     self.state = State::YieldStr;
                     Some("\\\"")
-                    },
+                }
                 None => None,
-                }
-            }
+            },
         }
     }
 }