1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95

use gotham::handler::HandlerFuture;
use gotham::helpers::http::response::create_response;
use gotham::middleware::Middleware;
use gotham_derive::NewMiddleware;
use gotham::state::{FromState, State};
use gotham::hyper::header::HeaderMap;
use gotham::hyper::{StatusCode, Uri};
use log::warn;
use std::pin::Pin;

#[derive(NewMiddleware,Clone)]
pub struct AuthMiddleware {
    pub userlist: Vec<String>,
    pub scopes: Vec<String>,
}

impl AuthMiddleware {
    pub fn default() -> AuthMiddleware {
        warn!("default should be call for dev only");
        AuthMiddleware {
            userlist: vec!["admin:admin".to_owned()],
            scopes: vec!["/".to_owned()],
        }
    }

    fn check_passwd(&self, code: &str) -> bool {
        match base64::decode(code) {
            Ok(decoded) => match String::from_utf8(decoded) {
                Ok(user_pass) => self.userlist.contains(&user_pass),
                Err(_) => false,
            },
            Err(_) => false,
        }
    }

    fn inside_scopes(&self, state: &State) -> bool {
        let path = Uri::borrow_from(&state).path();
        self.scopes
            .clone()
            .into_iter()
            .any(|scope| path.starts_with(&scope[..]))
    }

    fn handle_auth<Chain>(&self, state: State, chain: Chain) -> Pin<Box<HandlerFuture>>
    where
        Chain: FnOnce(State) -> Pin<Box<HandlerFuture>>,
    {
        let header = HeaderMap::borrow_from(&state);
        match header.get("Authorization") {
            Some(auth) => match auth.to_str() {
                Ok(auth_info) => {
                    let codes = auth_info.split(" ").collect::<Vec<&str>>();
                    match self.check_passwd(codes[1]) {
                        true => chain(state),
                        false => {
                            let body = format!("Auth failed ");
                            auth_error(state, body)
                        }
                    }
                }
                Err(e) => {
                    let body = format!("Invalid Auth header: {}", e);
                    auth_error(state, body)
                }
            },
            None => {
                let body = String::from("Unauthorized");
                auth_error(state, body)
            }
        }
    }
}

impl Middleware for AuthMiddleware {
    fn call<Chain>(self, state: State, chain: Chain) -> Pin<Box<HandlerFuture>>
    where
        Chain: FnOnce(State) -> Pin<Box<HandlerFuture>>,
    {
        match self.inside_scopes(&state) {
            true => self.handle_auth(state, chain),
            false => chain(state),
        }
    }
}

fn auth_error(state: State, body: String) -> Pin<Box<HandlerFuture>> {
    let mut resp = create_response(&state, StatusCode::UNAUTHORIZED, mime::TEXT_PLAIN, body);
    let headers = resp.headers_mut();
    let path = Uri::borrow_from(&state).path();
    headers.insert(
        "WWW-Authenticate",
        format!("Basic realm={}", path).parse().unwrap(),
    );
    Box::pin(futures::future::ok((state, resp)))
}