Implement proxying and redirection
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parent
9f8ec29e90
commit
8ae90553ae
193
src/main.rs
193
src/main.rs
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@ -1,10 +1,5 @@
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use std::{net::SocketAddr, convert::Infallible};
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use hyper::{Client, Server, service::{make_service_fn, service_fn}, body::HttpBody, Body, Response, Request, Method, http, upgrade::{self, Upgraded}};
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use tokio::net::TcpStream;
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// https://github.com/hyperium/hyper/blob/master/examples/gateway.rs
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// https://en.wikipedia.org/wiki/Gateway_(telecommunications)
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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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#[tokio::main(flavor = "current_thread")]
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async fn main() {
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@ -13,12 +8,12 @@ async fn main() {
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let config = {
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// Prefer ./config over /etc/proxima
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let file = unsafe {
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let file = {
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["./config", "/etc/proxima"]
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.iter()
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.map(load)
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.reduce(Result::or)
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.unwrap_unchecked()
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.expect("Impossible")
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};
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file.map(parse)
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@ -27,8 +22,68 @@ 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 client = Client::new();
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let make_service = make_service_fn(move |_| {
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let client = client.clone();
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let config = config.clone();
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async move {
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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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let config = config.clone();
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let client = client.clone();
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async move {
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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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}
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}
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Ok (Response::builder()
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.status(StatusCode::BAD_REQUEST)
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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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let server = Server::bind(&addr).serve(make_service);
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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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@ -47,11 +102,55 @@ impl Rule {
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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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@ -61,11 +160,12 @@ pub enum Effect {
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}
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impl Effect {
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pub async fn perform (&self) -> std::io::Result<()> {
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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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@ -83,6 +183,45 @@ impl Ports {
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}
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}
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/// A config consists of a set if [`Rule`].
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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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pub fn rules (&self) -> impl Iterator <Item = &Rule> {
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self.0.iter()
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}
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}
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/// Load a config from a path.
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pub fn load (p: impl AsRef<std::path::Path>) -> std::io::Result<String> {
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std::fs::read_to_string(p.as_ref())
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}
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/// Parse a config string.
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///
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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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/// 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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/// ```
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pub fn parse (data: String) -> Config {
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let rules = data
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.lines()
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.map(parse::rule)
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.filter_map(|x| match x {
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Ok ((_, rule)) => Some (rule),
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Err (e) => {
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eprintln!("Error parsing rule: {:?}", e);
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None
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},
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})
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.collect();
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Config (rules)
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}
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pub mod parse {
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use super::{ Ports, Effect, Pattern, Rule };
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@ -176,7 +315,7 @@ pub mod parse {
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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::char(' '), x, chr::char(' '));
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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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@ -241,35 +380,3 @@ pub mod parse {
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}
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/// A config consists of a set if [`Rule`].
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pub struct Config (Vec<Rule>);
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/// Load a config from a path.
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pub fn load (p: impl AsRef<std::path::Path>) -> std::io::Result<String> {
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std::fs::read_to_string(p.as_ref())
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}
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/// Parse a config string.
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///
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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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/// 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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/// ```
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pub fn parse (data: String) -> Config {
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let rules = data
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.lines()
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.map(parse::rule)
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.filter_map(|x| match x {
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Ok ((_, rule)) => Some (rule),
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Err (e) => {
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eprintln!("Error parsing rule: {:?}", e);
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None
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},
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})
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.collect();
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Config (rules)
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}
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