Add docs and refactor for readability
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13
README.md
13
README.md
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@ -1,3 +1,16 @@
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# Proxima
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Proxima is a simple gateway server.
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## Configuring
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Proxima reads the first config file it sees in the following order of preference:
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- `./config`
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- `/etc/proxima`
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In these files, each line is a rule consisting of a pattern (consisting of a
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hostname and a portspec) and an effect: either a number indicating a port on
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`0.0.0.0` to proxy the request to or a string that is used as the `location`
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header's value. If the latter effect is specified, Proxima redirects clients
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to that location.
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424
src/main.rs
424
src/main.rs
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@ -1,5 +1,10 @@
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use std::net::SocketAddr;
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use hyper::{service::{make_service_fn, service_fn}, Client, Error, Server, Response, StatusCode, Body, Request, Uri};
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use hyper::{service::{make_service_fn, service_fn}, Error, Server, Response, StatusCode, Body, Request, Uri, client::HttpConnector};
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pub mod parse;
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/// An alias for a [`hyper::Client`] with an [`HttpConnector`].
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pub type Client<C = HttpConnector> = hyper::Client<C>;
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#[tokio::main(flavor = "current_thread")]
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async fn main() {
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@ -21,8 +26,7 @@ async fn main() {
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};
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let addr = SocketAddr::from(([127, 0, 0, 1], 8100));
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let addr = SocketAddr::from(([127, 0, 0, 1], 8100));
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let client = Client::new();
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let make_service = make_service_fn(move |_| {
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@ -33,43 +37,34 @@ async fn main() {
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// This is the `Service` that will handle the connection.
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// `service_fn` is a helper to convert a function that
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// returns a Response into a `Service`.
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Ok::<_, Error>(service_fn(move |mut req| {
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Ok::<_, Error>(service_fn(move |req| {
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let config = config.clone();
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let client = client.clone();
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println!("{} {}", req.method(), req.uri());
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async move {
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// Perform the first matching rule
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for Rule (pattern, effect) in config.rules() {
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println!("{} {}", req.method(), req.uri());
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if pattern.matches(&req) {
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return match effect {
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Effect::Proxy { port, .. } => {
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let host = "0.0.0.0"; // Support for custom hosts added later
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let path = req.uri().path_and_query().map(|x| x.as_str()).unwrap_or("");
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let target = format!("http://{host}:{port}{path}");
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let uri = target.parse().unwrap();
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*req.uri_mut() = uri;
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println!("Proxying to {target}");
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client.request(req).await
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},
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Effect::Redirect (uri) => Ok ({
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println!("Redirecting to {uri}");
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Response::builder()
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.status(StatusCode::PERMANENT_REDIRECT)
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.header("Location", uri)
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.body(Body::empty())
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.unwrap()
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}),
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}
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let res = effect.perform(client, req).await;
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return res
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}
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}
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Ok (Response::builder()
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.status(StatusCode::BAD_REQUEST)
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println!("No matching rule found, returning error");
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// Return an empty response with a Bad Gateway status code
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// if no rules matched (and thus caused the loop to short-
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// circuit).
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let res = Response::builder()
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.status(StatusCode::BAD_GATEWAY)
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.body(Body::empty())
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.unwrap())
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.expect("Failed to construct response");
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Ok (res)
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}
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}))
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}
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@ -77,117 +72,18 @@ async fn main() {
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let server = Server::bind(&addr).serve(make_service);
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if let Err(e) = server.await {
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if let Err (e) = server.await {
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eprintln!("server error: {}", e);
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}
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}
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#[derive(Clone, Debug)]
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pub struct Rule (Pattern, Effect);
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impl Rule {
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/// Get the domain of the pattern.
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pub fn domain (&self) -> &str {
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&self.0.domain
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}
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/// Get the portspec
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pub fn ports (&self) -> &Ports {
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&self.0.ports
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}
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pub fn effect (&self) -> &Effect {
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&self.1
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}
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}
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#[derive(Clone, Debug)]
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pub struct Pattern {
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domain: String,
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ports: Ports,
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}
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impl Pattern {
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pub fn matches <T> (&self, req: &Request<T>) -> bool {
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let uri = req.uri();
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let (host, port) = {
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let host = req
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.headers()
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.get("host")
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.and_then(|x| x.to_str().ok())
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.and_then(|x| x.parse::<Uri>().ok());
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let h = uri
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.host()
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.map(|x| x.to_string())
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.or_else(|| {
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host.clone().and_then(|x| {
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x.host().map(|x| x.to_string())
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})
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});
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let p = uri
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.port_u16()
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.or_else(|| {
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host.and_then(|x| x.port_u16())
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});
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(h, p)
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};
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match host {
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Some (h) if &h == &self.domain => match &self.ports {
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Ports::Any => true,
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spec => match port {
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Some (p) => spec.includes(p),
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None => false,
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}
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},
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_ => false,
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}
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}
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}
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#[derive(Clone, Debug)]
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pub enum Effect {
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Redirect (String),
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Proxy {
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port: u16,
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ssl: bool,
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},
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}
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impl Effect {
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pub async fn perform (&self) -> Response<Body> {
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todo!()
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}
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}
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#[derive(Clone, Debug)]
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pub enum Ports {
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Single (u16),
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Either (Vec<u16>),
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Any
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}
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impl Ports {
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/// Whether this set of ports includes the given port.
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pub fn includes (&self, p: u16) -> bool {
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match self {
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Ports::Single (x) => *x == p,
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Ports::Either (l) => l.contains(&p),
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Ports::Any => true,
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}
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}
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}
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/// A config consists of a set if [`Rule`].
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/// A config consists of a set of [`Rule`]s.
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#[derive(Clone, Debug)]
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pub struct Config (Vec<Rule>);
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impl Config {
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/// Get the rules in the config.
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pub fn rules (&self) -> impl Iterator <Item = &Rule> {
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self.0.iter()
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}
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@ -203,9 +99,9 @@ pub fn load (p: impl AsRef<std::path::Path>) -> std::io::Result<String> {
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/// Example config string:
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///
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/// ```text
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/// hmt.riley.lgbt : (80 | 443) --> 6000 # --> is proxy_pass
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/// api.riley.lgbt : (80 | 443) --> 6000 # --> is proxy_pass
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/// riley.lgbt : (80 | 443) --> 3000 [ssl] # add [ssl] to automate ssl for this domain
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/// rly.cx : any ==> riley.lgbt # ==> is HTTP redirect
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/// rly.cx : * ==> riley.lgbt # ==> is HTTP redirect
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/// ```
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pub fn parse (data: String) -> Config {
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let rules = data
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@ -222,161 +118,137 @@ pub fn parse (data: String) -> Config {
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Config (rules)
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}
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pub mod parse {
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/// A rule consists of a [`Pattern`] and an [`Effect`]. If the pattern matches,
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/// the effect is performed.
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#[derive(Clone, Debug)]
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pub struct Rule (Pattern, Effect);
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use super::{ Ports, Effect, Pattern, Rule };
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use nom::{
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sequence as seq,
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multi as mul,
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character::complete as chr,
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bytes::complete::{self as byt, tag, take_till},
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Parser, error::ParseError, combinator::opt,
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};
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pub type PResult<'i, T> = nom::IResult<&'i str, T>;
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fn around <I, O, P, E, A, B> (a: A, b: B) -> impl Parser<I, O, E>
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where E: ParseError<I>,
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A: Parser<I, P, E> + Clone,
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B: Parser<I, O, E>,
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{
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seq::delimited(a.clone(), b, a)
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impl Rule {
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/// Get the domain of the pattern.
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pub fn host (&self) -> &str {
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&self.0.host
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}
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/// Parse a [`Portspec`].
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pub (super) fn portspec (s: &str) -> PResult<'_, Ports> {
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let single = chr::u16;
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let either = {
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let delim = around(chr::space1, chr::char('|'));
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seq::delimited(
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chr::char('('),
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mul::separated_list1(delim, single),
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chr::char(')'),
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)
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};
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let any = byt::tag("any");
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let single = single.map(Ports::Single);
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let either = either.map(Ports::Either);
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let any = any.map(|_| Ports::Any);
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single.or(either)
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.or(any)
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.parse(s)
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/// Get the portspec.
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pub fn ports (&self) -> &Ports {
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&self.0.ports
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}
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/// Parse an [`Effect`].
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pub fn effect (s: &str) -> PResult<'_, Effect> {
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let redirect = {
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let spaced = |x| seq::delimited(chr::space1, x, chr::space1);
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let internal = domain;
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seq::preceded(
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spaced(tag("==>")),
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internal,
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).map(Effect::Redirect)
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};
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let proxy = {
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let spaced = |x| seq::delimited(chr::space1, x, chr::space1);
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let ssl = opt(seq::delimited(
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seq::preceded(chr::space1, chr::char('[')),
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tag("ssl"),
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chr::char(']'),
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)).map(|o| o.is_some());
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let internal = seq::terminated(chr::u16, chr::space0);
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seq::preceded(
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spaced(tag("-->")),
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internal.and(ssl),
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).map(|(port, ssl)| Effect::Proxy { ssl, port })
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};
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redirect.or(proxy)
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.parse(s)
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/// Get the associated effect.
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pub fn effect (&self) -> &Effect {
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&self.1
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}
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}
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fn domain (s: &str) -> PResult<'_, String> {
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take_till(|c: char| !(c == '.' || c.is_alphanumeric()))
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.map(str::to_string)
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.parse(s)
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}
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/// A pattern consists of a host and a [portspec][Ports].
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#[derive(Clone, Debug)]
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pub struct Pattern {
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host: String,
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ports: Ports,
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}
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/// Parse a [`Pattern`].
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impl Pattern {
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/// Determine whether the given [`Request`] matches this pattern.
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///
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/// ```
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/// use proxima::parse;
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///
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/// # fn main () -> parse::PResult<'static, ()> {
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/// let (_, pattern) = parse::pattern("example.com : any")?;
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/// # Ok ("", ())
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/// # }
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/// ```
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pub fn pattern (s: &str) -> PResult<'_, Pattern> {
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let spaced = |x| seq::delimited(chr::space1, x, chr::space1);
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seq::separated_pair(domain, spaced(chr::char(':')), portspec)
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.map(|(domain, ports)| Pattern { domain, ports })
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.parse(s)
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}
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/// Parse a [`Rule`].
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pub fn rule (s: &str) -> PResult<'_, Rule> {
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pattern.and(effect)
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.map(|(p, e)| Rule (p, e))
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.parse(s)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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/// Test whether a pattern containing an Any portspec gets parsed
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/// correctly.
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#[test]
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fn simple_pattern () {
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let input = "example.com : any";
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let (_, Pattern { domain, ports }) = pattern(input).unwrap();
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assert!(domain == "example.com");
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assert!(match ports {
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Ports::Any => true,
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_ => false,
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})
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}
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/// Test whether an Either portspec is parsed correctly.
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#[test]
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fn either_portspec () {
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let input = "(69 | 420)";
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assert!(match portspec(input).unwrap() {
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("", Ports::Either(p)) => p == [69, 420],
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_ => false,
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})
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}
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/// Test whether domain names are parsed correctly.
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#[test]
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fn domains () {
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let inputs = ["example.com", "im.badat.dev", "riley.lgbt", "toot.site", "a.b.c.d.e.f.g.h"];
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// Each of these should be considered valid
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for input in inputs {
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domain(input).unwrap();
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/// For a request to match, it needs a `host` header.
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pub fn matches <T> (&self, req: &Request<T>) -> bool {
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let (host, port) = {
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// We need to parse the `host` header.
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if let Some (uri) = req
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.headers()
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.get("host")
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.and_then(|x| x.to_str().ok())
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.and_then(|x| x.parse::<Uri>().ok())
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{
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let host = uri.host().map(str::to_string);
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let port = uri.port_u16();
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(host, port.unwrap_or(80))
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} else {
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(None, 80)
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}
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};
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match host {
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// The domain needs to match in all cases
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Some (h) if &h == &self.host => match &self.ports {
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// We don't care about the port from the header if the
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// portspec is a wildcard
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Ports::Any => true,
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// Check if the port is included in the spec. If the
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// port couldn't be parsed, it defaults to `80`.
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spec => spec.includes(port),
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},
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// If no host header or the host header does not equal
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// the specified domain, the request does not match
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_ => false,
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}
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/// Test whether a simple rule gets parsed correctly.
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#[test]
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fn simple_rule () {
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let input = "example.gay : any --> 3000";
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let (_, Rule (_, effect)) = rule(input).unwrap();
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assert!(match effect {
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Effect::Proxy { port: 3000, ssl } if !ssl => true,
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_ => false,
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});
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}
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}
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}
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/// What to do with a matched request.
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#[derive(Clone, Debug)]
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pub enum Effect {
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/// Redirect to the given URI.
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Redirect (String),
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/// Proxy the request, optionally with managed SSL.
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Proxy {
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/// The port on `0.0.0.0` to proxy to.
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port: u16,
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/// Whether to manage SSL for this rule.
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ssl: bool,
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},
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}
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impl Effect {
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/// Perform the effect.
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pub async fn perform (&self, client: Client, mut req: Request<Body>) -> hyper::Result<Response<Body>> {
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match self {
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Effect::Proxy { port, .. } => {
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let host = "0.0.0.0"; // Support for custom hosts added later
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let path = req.uri().path_and_query().map(|x| x.as_str()).unwrap_or("");
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let target = format!("http://{host}:{port}{path}");
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let uri = target.parse().unwrap();
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*req.uri_mut() = uri;
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println!("Proxying to {target}");
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client.request(req).await
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},
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Effect::Redirect (uri) => Ok ({
|
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println!("Redirecting to {uri}");
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Response::builder()
|
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.status(StatusCode::PERMANENT_REDIRECT)
|
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.header("Location", uri)
|
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.body(Body::empty())
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.unwrap()
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}),
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}
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}
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}
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/// A specification of ports.
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#[derive(Clone, Debug)]
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pub enum Ports {
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/// Just this one port.
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Single (u16),
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/// Any of the specified ports.
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Either (Vec<u16>),
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/// Wildcard, skip port check.
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Any
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}
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impl Ports {
|
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/// Whether this set of ports includes the given port.
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pub fn includes (&self, p: u16) -> bool {
|
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match self {
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Ports::Single (x) => *x == p,
|
||||
Ports::Either (l) => l.contains(&p),
|
||||
Ports::Any => true,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,149 @@
|
|||
//! Parsers for parts of the config file.
|
||||
|
||||
// TODO: comments
|
||||
|
||||
use super::{ Ports, Effect, Pattern, Rule };
|
||||
use nom::{
|
||||
sequence as seq,
|
||||
multi as mul,
|
||||
character::complete as chr,
|
||||
bytes::complete::{self as byt, tag, take_till},
|
||||
Parser, error::ParseError, combinator::opt,
|
||||
};
|
||||
|
||||
/// The result of running a parser.
|
||||
pub type PResult<'i, T> = nom::IResult<&'i str, T>;
|
||||
|
||||
fn around <I, O, P, E, A, B> (a: A, b: B) -> impl Parser<I, O, E>
|
||||
where E: ParseError<I>,
|
||||
A: Parser<I, P, E> + Clone,
|
||||
B: Parser<I, O, E>,
|
||||
{
|
||||
seq::delimited(a.clone(), b, a)
|
||||
}
|
||||
|
||||
/// Parse a set of [`Ports`].
|
||||
pub fn ports (s: &str) -> PResult<'_, Ports> {
|
||||
let single = chr::u16;
|
||||
let either = {
|
||||
let delim = around(chr::space1, chr::char('|'));
|
||||
seq::delimited(
|
||||
chr::char('('),
|
||||
mul::separated_list1(delim, single),
|
||||
chr::char(')'),
|
||||
)
|
||||
};
|
||||
let any = byt::tag("*");
|
||||
|
||||
let single = single.map(Ports::Single);
|
||||
let either = either.map(Ports::Either);
|
||||
let any = any.map(|_| Ports::Any);
|
||||
|
||||
single.or(either)
|
||||
.or(any)
|
||||
.parse(s)
|
||||
}
|
||||
|
||||
/// Parse an [`Effect`].
|
||||
pub fn effect (s: &str) -> PResult<'_, Effect> {
|
||||
|
||||
let redirect = {
|
||||
let spaced = |x| seq::delimited(chr::space1, x, chr::space1);
|
||||
|
||||
seq::preceded(
|
||||
spaced(tag("==>")),
|
||||
target,
|
||||
).map(Effect::Redirect)
|
||||
};
|
||||
|
||||
let proxy = {
|
||||
let spaced = |x| seq::delimited(chr::space1, x, chr::space1);
|
||||
let ssl = opt(seq::delimited(
|
||||
seq::preceded(chr::space1, chr::char('[')),
|
||||
tag("ssl"),
|
||||
chr::char(']'),
|
||||
)).map(|o| o.is_some());
|
||||
let internal = seq::terminated(chr::u16, chr::space0);
|
||||
|
||||
seq::preceded(
|
||||
spaced(tag("-->")),
|
||||
internal.and(ssl),
|
||||
).map(|(port, ssl)| Effect::Proxy { ssl, port })
|
||||
};
|
||||
|
||||
redirect.or(proxy)
|
||||
.parse(s)
|
||||
|
||||
}
|
||||
|
||||
fn target (s: &str) -> PResult<'_, String> {
|
||||
take_till(|c: char| !(c == '.' || c.is_alphanumeric()))
|
||||
.map(str::to_string)
|
||||
.parse(s)
|
||||
}
|
||||
|
||||
/// Parse a [`Pattern`].
|
||||
pub fn pattern (s: &str) -> PResult<'_, Pattern> {
|
||||
let spaced = |x| seq::delimited(chr::space1, x, chr::space1);
|
||||
seq::separated_pair(target, spaced(chr::char(':')), ports)
|
||||
.map(|(domain, ports)| Pattern { host: domain, ports })
|
||||
.parse(s)
|
||||
}
|
||||
|
||||
/// Parse a [`Rule`].
|
||||
pub fn rule (s: &str) -> PResult<'_, Rule> {
|
||||
pattern.and(effect)
|
||||
.map(|(p, e)| Rule (p, e))
|
||||
.parse(s)
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
|
||||
use super::*;
|
||||
|
||||
/// Test whether a pattern containing an Any portspec gets parsed
|
||||
/// correctly.
|
||||
#[test]
|
||||
fn simple_pattern () {
|
||||
let input = "example.com : *";
|
||||
let (_, Pattern { host: domain, ports }) = pattern(input).unwrap();
|
||||
assert!(domain == "example.com");
|
||||
assert!(match ports {
|
||||
Ports::Any => true,
|
||||
_ => false,
|
||||
})
|
||||
}
|
||||
|
||||
/// Test whether an Either portspec is parsed correctly.
|
||||
#[test]
|
||||
fn either_ports () {
|
||||
let input = "(69 | 420)";
|
||||
assert!(match ports(input).unwrap() {
|
||||
("", Ports::Either(p)) => p == [69, 420],
|
||||
_ => false,
|
||||
})
|
||||
}
|
||||
|
||||
/// Test whether target names are parsed correctly.
|
||||
#[test]
|
||||
fn targets () {
|
||||
let inputs = ["example.com", "im.badat.dev", "riley.lgbt", "toot.site", "a.b.c.d.e.f.g.h"];
|
||||
// Each of these should be considered valid
|
||||
for input in inputs {
|
||||
target(input).unwrap();
|
||||
}
|
||||
}
|
||||
|
||||
/// Test whether a simple rule gets parsed correctly.
|
||||
#[test]
|
||||
fn simple_rule () {
|
||||
let input = "example.gay : * --> 3000";
|
||||
let (_, Rule (_, effect)) = rule(input).unwrap();
|
||||
assert!(match effect {
|
||||
Effect::Proxy { port: 3000, ssl } if !ssl => true,
|
||||
_ => false,
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue