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pub mod auth;
mod host_validation;
use address;
use std::cmp;
use std::sync::Arc;
use std::collections::HashMap;
use url::{Url, Host};
use hyper::{self, server, header, Next, Encoder, Decoder, Control, StatusCode};
use hyper::net::HttpStream;
use apps::{self, DAPPS_DOMAIN};
use apps::fetcher::Fetcher;
use endpoint::{Endpoint, Endpoints, EndpointPath};
use handlers::{self, Redirection, ContentHandler};
use self::auth::{Authorization, Authorized};
#[derive(Debug, PartialEq, Hash, Eq)]
pub enum SpecialEndpoint {
Rpc,
Api,
Utils,
None,
}
pub struct Router<A: Authorization + 'static> {
control: Option<Control>,
signer_address: Option<(String, u16)>,
endpoints: Arc<Endpoints>,
fetch: Arc<Fetcher>,
special: Arc<HashMap<SpecialEndpoint, Box<Endpoint>>>,
authorization: Arc<A>,
allowed_hosts: Option<Vec<String>>,
handler: Box<server::Handler<HttpStream> + Send>,
}
impl<A: Authorization + 'static> server::Handler<HttpStream> for Router<A> {
fn on_request(&mut self, req: server::Request<HttpStream>) -> Next {
let url = handlers::extract_url(&req);
let endpoint = extract_endpoint(&url);
let referer = extract_referer_endpoint(&req);
let is_utils = endpoint.1 == SpecialEndpoint::Utils;
let is_get_request = *req.method() == hyper::Method::Get;
trace!(target: "dapps", "Routing request to {:?}. Details: {:?}", url, req);
if let Some(ref hosts) = self.allowed_hosts {
trace!(target: "dapps", "Validating host headers against: {:?}", hosts);
let is_valid = is_utils || host_validation::is_valid(&req, hosts, self.endpoints.keys().cloned().collect());
if !is_valid {
debug!(target: "dapps", "Rejecting invalid host header.");
self.handler = host_validation::host_invalid_response();
return self.handler.on_request(req);
}
}
trace!(target: "dapps", "Checking authorization.");
let auth = self.authorization.is_authorized(&req);
if let Authorized::No(handler) = auth {
debug!(target: "dapps", "Authorization denied.");
self.handler = handler;
return self.handler.on_request(req);
}
let control = self.control.take().expect("on_request is called only once; control is always defined at start; qed");
debug!(target: "dapps", "Handling endpoint request: {:?}", endpoint);
self.handler = match (endpoint.0, endpoint.1, referer) {
(ref path, SpecialEndpoint::None, Some((ref referer, ref referer_url)))
if referer.app_id == apps::WEB_PATH
&& self.endpoints.contains_key(apps::WEB_PATH)
&& !is_web_endpoint(path)
=>
{
trace!(target: "dapps", "Redirecting to correct web request: {:?}", referer_url);
let using_domain = if referer.using_dapps_domains { 0 } else { 1 };
let len = cmp::min(referer_url.path.len(), using_domain + 3);
let base = referer_url.path[..len].join("/");
let requested = url.map(|u| u.path.join("/")).unwrap_or_default();
Redirection::boxed(&format!("/{}/{}", base, requested))
},
(ref path, ref endpoint, _) if self.special.contains_key(endpoint) => {
trace!(target: "dapps", "Resolving to special endpoint.");
self.special.get(endpoint)
.expect("special known to contain key; qed")
.to_async_handler(path.clone().unwrap_or_default(), control)
},
(Some(ref path), _, _) if self.endpoints.contains_key(&path.app_id) => {
trace!(target: "dapps", "Resolving to local/builtin dapp.");
self.endpoints.get(&path.app_id)
.expect("endpoints known to contain key; qed")
.to_async_handler(path.clone(), control)
},
(Some(ref path), _, _) if self.fetch.contains(&path.app_id) => {
trace!(target: "dapps", "Resolving to fetchable content.");
self.fetch.to_async_handler(path.clone(), control)
},
(Some(ref path), _, _) if is_get_request && path.app_id != "home" => {
trace!(target: "dapps", "Resolving to 404.");
Box::new(ContentHandler::error(
StatusCode::NotFound,
"404 Not Found",
"Requested content was not found.",
None,
self.signer_address.clone(),
))
},
_ if is_get_request => {
if let Some(signer_address) = self.signer_address.clone() {
trace!(target: "dapps", "Redirecting to signer interface.");
Redirection::boxed(&format!("http://{}", address(signer_address)))
} else {
trace!(target: "dapps", "Signer disabled, returning 404.");
Box::new(ContentHandler::error(
StatusCode::NotFound,
"404 Not Found",
"Your homepage is not available when Trusted Signer is disabled.",
Some("You can still access dapps by writing a correct address, though. Re-enable Signer to get your homepage back."),
self.signer_address.clone(),
))
}
},
_ => {
trace!(target: "dapps", "Resolving to RPC call.");
self.special.get(&SpecialEndpoint::Rpc)
.expect("RPC endpoint always stored; qed")
.to_async_handler(EndpointPath::default(), control)
}
};
self.handler.on_request(req)
}
fn on_request_readable(&mut self, decoder: &mut Decoder<HttpStream>) -> Next {
self.handler.on_request_readable(decoder)
}
fn on_response(&mut self, response: &mut server::Response) -> Next {
self.handler.on_response(response)
}
fn on_response_writable(&mut self, encoder: &mut Encoder<HttpStream>) -> Next {
self.handler.on_response_writable(encoder)
}
}
impl<A: Authorization> Router<A> {
pub fn new(
control: Control,
signer_address: Option<(String, u16)>,
content_fetcher: Arc<Fetcher>,
endpoints: Arc<Endpoints>,
special: Arc<HashMap<SpecialEndpoint, Box<Endpoint>>>,
authorization: Arc<A>,
allowed_hosts: Option<Vec<String>>,
) -> Self {
let handler = special.get(&SpecialEndpoint::Utils)
.expect("Utils endpoint always stored; qed")
.to_handler(EndpointPath::default());
Router {
control: Some(control),
signer_address: signer_address,
endpoints: endpoints,
fetch: content_fetcher,
special: special,
authorization: authorization,
allowed_hosts: allowed_hosts,
handler: handler,
}
}
}
fn is_web_endpoint(path: &Option<EndpointPath>) -> bool {
match *path {
Some(ref path) if path.app_id == apps::WEB_PATH => true,
_ => false,
}
}
fn extract_referer_endpoint(req: &server::Request<HttpStream>) -> Option<(EndpointPath, Url)> {
let referer = req.headers().get::<header::Referer>();
let url = referer.and_then(|referer| Url::parse(&referer.0).ok());
url.and_then(|url| {
let option = Some(url);
extract_url_referer_endpoint(&option).or_else(|| {
extract_endpoint(&option).0.map(|endpoint| (endpoint, option.expect("Just wrapped; qed")))
})
})
}
fn extract_url_referer_endpoint(url: &Option<Url>) -> Option<(EndpointPath, Url)> {
let query = url.as_ref().and_then(|url| url.query.as_ref());
match (url, query) {
(&Some(ref url), Some(ref query)) if query.starts_with(apps::URL_REFERER) => {
let referer_url = format!("http://{}:{}/{}", url.host, url.port, &query[apps::URL_REFERER.len()..]);
debug!(target: "dapps", "Recovering referer from query parameter: {}", referer_url);
let referer_url = Url::parse(&referer_url).ok();
extract_endpoint(&referer_url).0.map(|endpoint| {
(endpoint, referer_url.expect("Endpoint returned only when url `is_some`").clone())
})
},
_ => None,
}
}
fn extract_endpoint(url: &Option<Url>) -> (Option<EndpointPath>, SpecialEndpoint) {
fn special_endpoint(url: &Url) -> SpecialEndpoint {
if url.path.len() <= 1 {
return SpecialEndpoint::None;
}
match url.path[0].as_ref() {
apps::RPC_PATH => SpecialEndpoint::Rpc,
apps::API_PATH => SpecialEndpoint::Api,
apps::UTILS_PATH => SpecialEndpoint::Utils,
_ => SpecialEndpoint::None,
}
}
match *url {
Some(ref url) => match url.host {
Host::Domain(ref domain) if domain.ends_with(DAPPS_DOMAIN) => {
let len = domain.len() - DAPPS_DOMAIN.len();
let id = domain[0..len].to_owned();
(Some(EndpointPath {
app_id: id,
host: domain.clone(),
port: url.port,
using_dapps_domains: true,
}), special_endpoint(url))
},
_ if url.path.len() > 1 => {
let id = url.path[0].clone();
(Some(EndpointPath {
app_id: id.clone(),
host: format!("{}", url.host),
port: url.port,
using_dapps_domains: false,
}), special_endpoint(url))
},
_ => (None, special_endpoint(url)),
},
_ => (None, SpecialEndpoint::None)
}
}
#[test]
fn should_extract_endpoint() {
assert_eq!(extract_endpoint(&None), (None, SpecialEndpoint::None));
assert_eq!(
extract_endpoint(&Url::parse("http://localhost:8080/status/index.html").ok()),
(Some(EndpointPath {
app_id: "status".to_owned(),
host: "localhost".to_owned(),
port: 8080,
using_dapps_domains: false,
}), SpecialEndpoint::None)
);
assert_eq!(
extract_endpoint(&Url::parse("http://localhost:8080/rpc/").ok()),
(Some(EndpointPath {
app_id: "rpc".to_owned(),
host: "localhost".to_owned(),
port: 8080,
using_dapps_domains: false,
}), SpecialEndpoint::Rpc)
);
assert_eq!(
extract_endpoint(&Url::parse("http://my.status.parity/parity-utils/inject.js").ok()),
(Some(EndpointPath {
app_id: "my.status".to_owned(),
host: "my.status.parity".to_owned(),
port: 80,
using_dapps_domains: true,
}), SpecialEndpoint::Utils)
);
assert_eq!(
extract_endpoint(&Url::parse("http://my.status.parity/test.html").ok()),
(Some(EndpointPath {
app_id: "my.status".to_owned(),
host: "my.status.parity".to_owned(),
port: 80,
using_dapps_domains: true,
}), SpecialEndpoint::None)
);
assert_eq!(
extract_endpoint(&Url::parse("http://my.status.parity/rpc/").ok()),
(Some(EndpointPath {
app_id: "my.status".to_owned(),
host: "my.status.parity".to_owned(),
port: 80,
using_dapps_domains: true,
}), SpecialEndpoint::Rpc)
);
assert_eq!(
extract_endpoint(&Url::parse("http://my.status.parity/api/").ok()),
(Some(EndpointPath {
app_id: "my.status".to_owned(),
host: "my.status.parity".to_owned(),
port: 80,
using_dapps_domains: true,
}), SpecialEndpoint::Api)
);
}