It works kinda?

src/config.rs

@@ -0,0 +1,29 @@
+extern crate serde_derive;
+extern crate toml;
+use toml::de::Error;
+// use serde_derive::Deserialize;
+
+
+#[derive(Debug, Deserialize)]
+pub struct Config {
+    pub port: i32,
+    pub host: String,
+    pub server: Vec<Server>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Server {
+    pub url: String,
+    pub dir:  String,
+    pub key:  String,
+    pub cert: String,
+}
+
+impl Config {
+    pub fn new(file: &str) -> Config {
+        let fd = std::fs::read_to_string(file).unwrap();
+        let config: Config = toml::from_str(&fd).unwrap();
+        return config;
+    }
+}
+

src/main.rs

@@ -0,0 +1,113 @@
+#[macro_use]
+extern crate serde_derive;
+
+use std::fs::File;
+use std::sync::Arc;
+use std::net::ToSocketAddrs;
+use std::io::{ self, BufReader };
+use futures_util::future::TryFutureExt;
+use tokio::prelude::*;
+use tokio::runtime;
+use tokio::net::TcpListener;
+use tokio::io::AsyncWriteExt;
+use tokio_rustls::rustls::{ Certificate, NoClientAuth, PrivateKey, ServerConfig };
+use tokio_rustls::rustls::internal::pemfile::{ certs, pkcs8_private_keys };
+use tokio_rustls::TlsAcceptor;
+use tokio_rustls::server::TlsStream;
+use tokio::net::TcpStream;
+use url::Url;
+use std::error::Error;
+
+
+mod config;
+
+fn load_certs(path: &String) -> io::Result<Vec<Certificate>> {
+    certs(&mut BufReader::new(File::open(path)?))
+        .map_err(|_| io::Error::new(io::ErrorKind::InvalidInput, "invalid cert"))
+}
+
+fn load_keys(path: &String) -> PrivateKey {
+    let keyfile = File::open(path)
+            .expect("cannot open private key file");
+    let mut reader = BufReader::new(keyfile);
+    let key = pkcs8_private_keys(&mut reader)
+            .expect("file contains invalid rsa private key");
+    return key[0].clone();
+}
+
+fn get_content(request: String) -> String {
+
+    let url = Url::parse(&request).unwrap();
+
+    let path = match url.path() {
+        "/" => String::from("index.gemini"),
+        path => str::replace(path, "/", ""),
+    };
+
+    let fd = std::fs::read_to_string(path)
+        .expect("Unable to read file");
+
+    fd
+}
+
+async fn handle_connection(mut stream: TlsStream<TcpStream>) -> Result<(), Box<dyn Error>> {
+    let mut buffer = [0;512];
+    stream.read(&mut buffer).await?;
+    let request = String::from_utf8_lossy(&buffer[..]).to_owned();
+    println!("Request: {}", request);
+
+    stream.write_all(&b"20\ttext/gemini\r\n"[..]).await?;
+    stream.flush().await?;
+
+    let content = get_content(request.to_string());
+    stream.write_all(content.as_bytes()).await?;
+    stream.flush().await?;
+
+    Ok(())
+}
+
+
+fn main() -> io::Result<()> {
+    let cfg = config::Config::new("config.toml");
+
+    let addr = format!("{}:{}", cfg.host, cfg.port);
+    addr.to_socket_addrs()?
+        .next()
+        .ok_or_else(|| io::Error::from(io::ErrorKind::AddrNotAvailable))?;
+
+    let certs = load_certs(&cfg.server[0].cert)?;
+    let keys = load_keys(&cfg.server[0].key);
+
+    let mut runtime = runtime::Builder::new()
+        .threaded_scheduler()
+        .enable_io()
+        .build()?;
+    let handle = runtime.handle().clone();
+    let mut config = ServerConfig::new(NoClientAuth::new());
+    config.set_single_cert(certs, keys)
+        .map_err(|err| io::Error::new(io::ErrorKind::InvalidInput, err))?;
+    let acceptor = TlsAcceptor::from(Arc::new(config));
+
+    println!("Serving");
+
+    let fut = async {
+        let mut listener = TcpListener::bind(&addr).await?;
+
+        loop {
+            let (stream, peer_addr) = listener.accept().await?;
+            let acceptor = acceptor.clone();
+
+            let fut = async move {
+                let stream = acceptor.accept(stream).await?;
+                handle_connection(stream).await;
+                println!("Hello: {}", peer_addr);
+
+                Ok(()) as io::Result<()>
+            };
+
+            handle.spawn(fut.unwrap_or_else(|err| eprintln!("{:?}", err)));
+        }
+    };
+
+    runtime.block_on(fut)
+}