openethereum/webapp/src/router/auth.rs

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2016-04-08 15:25:20 +02:00
// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! HTTP Authorization implementations
use std::collections::HashMap;
use hyper::{header, server};
use hyper::status::StatusCode;
/// Authorization result
pub enum Authorized<'a, 'b> where 'b : 'a {
/// Authorization was successful. Request and Response are returned for further processing.
Yes(server::Request<'a, 'b>, server::Response<'a>),
/// Unsuccessful authorization. Request and Response has been consumed.
No,
}
/// Authorization interface
pub trait Authorization : Send + Sync {
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/// Handle authorization process and return `Request` and `Response` when authorization is successful.
fn handle<'b, 'a>(&'a self, req: server::Request<'a, 'b>, res: server::Response<'a>)-> Authorized<'a, 'b>;
}
/// HTTP Basic Authorization handler
pub struct HttpBasicAuth {
users: HashMap<String, String>,
}
/// No-authorization implementation (authorization disabled)
pub struct NoAuth;
impl Authorization for NoAuth {
fn handle<'b, 'a>(&'a self, req: server::Request<'a, 'b>, res: server::Response<'a>)-> Authorized<'a, 'b> {
Authorized::Yes(req, res)
}
}
impl Authorization for HttpBasicAuth {
fn handle<'b, 'a>(&'a self, req: server::Request<'a, 'b>, res: server::Response<'a>)-> Authorized<'a, 'b> {
let auth = self.check_auth(&req);
match auth {
Access::Denied => {
self.respond_with_unauthorized(res);
Authorized::No
},
Access::AuthRequired => {
self.respond_with_auth_required(res);
Authorized::No
},
Access::Granted => {
Authorized::Yes(req, res)
},
}
}
}
enum Access {
Granted,
Denied,
AuthRequired,
}
impl HttpBasicAuth {
/// Creates `HttpBasicAuth` instance with only one user.
pub fn single_user(username: &str, password: &str) -> Self {
let mut users = HashMap::new();
users.insert(username.to_owned(), password.to_owned());
HttpBasicAuth {
users: users
}
}
fn is_authorized(&self, username: &str, password: &str) -> bool {
self.users.get(&username.to_owned()).map_or(false, |pass| pass == password)
}
fn check_auth(&self, req: &server::Request) -> Access {
match req.headers.get::<header::Authorization<header::Basic>>() {
Some(&header::Authorization(header::Basic { ref username, password: Some(ref password) })) => {
if self.is_authorized(username, password) {
Access::Granted
} else {
Access::Denied
}
},
Some(&header::Authorization(header::Basic { username: _, password: None })) => {
Access::Denied
},
None => {
Access::AuthRequired
},
}
}
fn respond_with_unauthorized(&self, mut res: server::Response) {
*res.status_mut() = StatusCode::Unauthorized;
let _ = res.send(b"Unauthorized");
}
fn respond_with_auth_required(&self, mut res: server::Response) {
*res.status_mut() = StatusCode::Unauthorized;
res.headers_mut().set_raw("WWW-Authenticate", vec![b"Basic realm=\"Parity\"".to_vec()]);
}
}