commit acef45c75cff88fad60ad871234107d2f259f791
Author: panicbit <panicbit.dev@gmail.com>
Date:   Sat Oct 31 20:53:03 2020 +0100

    init

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9f7250a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+/target
+Cargo.lock
+/cert/
+/public/
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f3e233a
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "northstar"
+version = "0.1.0"
+authors = ["panicbit <panicbit.dev@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.33"
+tokio-rustls = "0.20.0"
+tokio = { version = "0.3.1", features = ["full"] }
+mime = "0.3.16"
+uriparse = "0.6.3"
+percent-encoding = "2.1.0"
+futures = "0.3.7"
+itertools = "0.9.0"
+log = "0.4.11"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..0f038a0
--- /dev/null
+++ b/README.md
@@ -0,0 +1,33 @@
+```
+                     __  __         __
+   ____  ____  _____/ /_/ /_  _____/ /_____ ______
+  / __ \/ __ \/ ___/ __/ __ \/ ___/ __/ __ `/ ___/
+ / / / / /_/ / /  / /_/ / / (__  ) /_/ /_/ / /
+/_/ /_/\____/_/   \__/_/ /_/____/\__/\__,_/_/
+```
+
+- [Documentation](https://docs.rs/northstar)
+- [GitHub](https://github.com/panicbit/northstar)
+
+# Usage
+
+Add the latest version of northstar to your `Cargo.toml`.
+
+## Manually
+
+```toml
+northstar = "0.1.0" # check crates.io for the latest version
+```
+
+## Automatically
+
+```sh
+cargo add northstar
+```
+
+# Generating a key & certificate
+
+```sh
+mkdir cert && cd cert
+openssl req -x509 -nodes -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365
+```
diff --git a/examples/serve_dir.rs b/examples/serve_dir.rs
new file mode 100644
index 0000000..d4a6bb8
--- /dev/null
+++ b/examples/serve_dir.rs
@@ -0,0 +1,20 @@
+use anyhow::*;
+use futures::{future::BoxFuture, FutureExt};
+use northstar::{Server, Request, Response, GEMINI_PORT};
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    Server::bind(("localhost", GEMINI_PORT))
+        .serve(handle_request)
+        .await
+}
+
+fn handle_request(request: Request) -> BoxFuture<'static, Result<Response>> {
+    async move {
+        let path = request.path_segments();
+        let response = northstar::util::serve_dir("public", &path).await?;
+
+        Ok(response)
+    }
+    .boxed()
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..03468ce
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,199 @@
+#[macro_use] extern crate log;
+
+use std::{panic::AssertUnwindSafe, convert::TryFrom, io::BufReader, sync::Arc};
+use futures::{future::BoxFuture, FutureExt};
+use mime::Mime;
+use tokio::{
+    prelude::*,
+    io::{self, BufStream},
+    net::{TcpStream, ToSocketAddrs},
+};
+use tokio::net::TcpListener;
+use tokio_rustls::{rustls, TlsAcceptor};
+use rustls::*;
+use anyhow::*;
+use uri::URIReference;
+
+pub mod types;
+pub mod util;
+
+pub use mime;
+pub use uriparse as uri;
+pub use types::*;
+
+pub const REQUEST_URI_MAX_LEN: usize = 1024;
+pub const GEMINI_PORT: u16 = 1965;
+
+type Handler = Arc<dyn Fn(Request) -> HandlerResponse + Send + Sync>;
+type HandlerResponse = BoxFuture<'static, Result<Response>>;
+
+#[derive(Clone)]
+pub struct Server {
+    tls_acceptor: TlsAcceptor,
+    listener: Arc<TcpListener>,
+    handler: Handler,
+}
+
+impl Server {
+    pub fn bind<A: ToSocketAddrs>(addr: A) -> Builder<A> {
+        Builder::bind(addr)
+    }
+
+    async fn serve(self) -> Result<()> {
+        loop {
+            let (stream, _addr) = self.listener.accept().await?;
+            let this = self.clone();
+
+            tokio::spawn(async move {
+                if let Err(err) = this.serve_client(stream).await {
+                    error!("{}", err);
+                }
+            });
+        }
+    }
+
+    async fn serve_client(self, stream: TcpStream) -> Result<()> {
+        let stream = self.tls_acceptor.accept(stream).await?;
+        let mut stream = BufStream::new(stream);
+
+        let request = receive_request(&mut stream).await?;
+        debug!("Client requested: {}", request.uri());
+
+        let handler = (self.handler)(request);
+        let handler = AssertUnwindSafe(handler);
+
+        let response = handler.catch_unwind().await
+            .unwrap_or_else(|_| Response::server_error(""))
+            .or_else(|err| {
+                error!("Handler: {}", err);
+                Response::server_error("")
+            })?;
+
+        send_response(response, &mut stream).await?;
+
+        stream.flush().await?;
+
+        Ok(())
+    }
+}
+
+pub struct Builder<A> {
+    addr: A,
+}
+
+impl<A: ToSocketAddrs> Builder<A> {
+    fn bind(addr: A) -> Self {
+        Self { addr }
+    }
+
+    pub async fn serve<F>(self, handler: F) -> Result<()>
+    where
+        F: Fn(Request) -> HandlerResponse + Send + Sync + 'static,
+    {
+        let config = tls_config()?;
+
+        let server = Server {
+            tls_acceptor: TlsAcceptor::from(config),
+            listener: Arc::new(TcpListener::bind(self.addr).await?),
+            handler: Arc::new(handler),
+        };
+        
+        server.serve().await
+    }
+}
+
+async fn receive_request(stream: &mut (impl AsyncBufRead + Unpin)) -> Result<Request> {
+    let limit = REQUEST_URI_MAX_LEN + "\r\n".len();
+    let mut stream = stream.take(limit as u64);
+    let mut uri = Vec::new();
+
+    stream.read_until(b'\n', &mut uri).await?;
+
+    if !uri.ends_with(b"\r\n") {
+        if uri.len() < REQUEST_URI_MAX_LEN {
+            bail!("Request header not terminated with CRLF")
+        } else {
+            bail!("Request URI too long")
+        }
+    }
+
+    // Strip CRLF
+    uri.pop();
+    uri.pop();
+
+    let uri = URIReference::try_from(&*uri)?.into_owned();
+    let request = Request::from_uri(uri)?;
+
+    Ok(request)
+}
+
+async fn send_response(mut response: Response, stream: &mut (impl AsyncWrite + Unpin)) -> Result<()> {
+    send_response_header(response.header(), stream).await?;
+
+    if let Some(body) = response.take_body() {
+        send_response_body(body, stream).await?;
+    }
+
+    Ok(())
+}
+
+async fn send_response_header(header: &ResponseHeader, stream: &mut (impl AsyncWrite + Unpin)) -> Result<()> {
+    let header = format!(
+        "{status} {meta}\r\n",
+        status = header.status.code(),
+        meta = header.meta.as_str(),
+    );
+
+    stream.write_all(header.as_bytes()).await?;
+
+    Ok(())
+}
+
+async fn send_response_body(body: Body, stream: &mut (impl AsyncWrite + Unpin)) -> Result<()> {
+    match body {
+        Body::Bytes(bytes) => stream.write_all(&bytes).await?,
+        Body::Reader(mut reader) => { io::copy(&mut reader, stream).await?; },
+    }
+
+    Ok(())
+}
+
+fn tls_config() -> Result<Arc<ServerConfig>> {
+    let mut config = ServerConfig::new(NoClientAuth::new());
+
+    let cert_chain = load_cert_chain()?;
+    let key = load_key()?;
+    config.set_single_cert(cert_chain, key)?;
+
+    Ok(config.into())
+}
+
+fn load_cert_chain() -> Result<Vec<Certificate>> {
+    let certs = std::fs::File::open("cert/cert.pem")?;
+    let mut certs = BufReader::new(certs);
+    let certs = rustls::internal::pemfile::certs(&mut certs)
+        .map_err(|_| anyhow!("failed to load certs"))?;
+
+    Ok(certs)
+}
+
+fn load_key() -> Result<PrivateKey> {
+    let mut keys = BufReader::new(std::fs::File::open("cert/key.pem")?);
+    let mut keys = rustls::internal::pemfile::pkcs8_private_keys(&mut keys)
+        .map_err(|_| anyhow!("failed to load key"))?;
+    
+    ensure!(!keys.is_empty(), "no key found");
+
+    let key = keys.swap_remove(0);
+
+    Ok(key)
+}
+
+const GEMINI_MIME: &str = "text/gemini";
+
+pub fn gemini_mime() -> Result<Mime> {
+    let mime = GEMINI_MIME.parse()?;
+    Ok(mime)
+}
+
+
diff --git a/src/types.rs b/src/types.rs
new file mode 100644
index 0000000..cabadcd
--- /dev/null
+++ b/src/types.rs
@@ -0,0 +1,287 @@
+use std::ops;
+use anyhow::*;
+use mime::Mime;
+use percent_encoding::percent_decode_str;
+use tokio::{io::AsyncRead, fs::File};
+use uriparse::URIReference;
+
+pub struct Request {
+    uri: URIReference<'static>,
+    input: Option<String>,
+}
+
+impl Request {
+    pub fn from_uri(mut uri: URIReference<'static>) -> Result<Self> {
+        uri.normalize();
+
+        let input = match uri.query() {
+            None => None,
+            Some(query) => {
+                let input = percent_decode_str(query.as_str())
+                    .decode_utf8()?
+                    .into_owned();
+                Some(input)
+            }
+        };
+
+        Ok(Self {
+            uri,
+            input,
+        })
+    }
+
+    pub fn uri(&self) -> &URIReference {
+        &self.uri
+    }
+
+    pub fn path_segments(&self) -> Vec<String> {
+        self.uri()
+            .path()
+            .segments()
+            .iter()
+            .map(|segment| percent_decode_str(segment.as_str()).decode_utf8_lossy().into_owned())
+            .collect::<Vec<String>>()
+    }
+
+    pub fn input(&self) -> Option<&str> {
+        self.input.as_deref()
+    }
+}
+
+impl ops::Deref for Request {
+    type Target = URIReference<'static>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.uri
+    }
+}
+
+#[derive(Debug,Clone)]
+pub struct ResponseHeader {
+    pub status: Status,
+    pub meta: Meta,
+}
+
+impl ResponseHeader {
+    pub fn input(prompt: impl AsRef<str> + Into<String>) -> Result<Self> {
+        Ok(Self {
+            status: Status::INPUT,
+            meta: Meta::new(prompt)?,
+        })
+    }
+
+    pub fn success(mime: &Mime) -> Result<Self> {
+        Ok(Self {
+            status: Status::SUCCESS,
+            meta: Meta::new(mime.to_string())?,
+        })
+    }
+
+    pub fn server_error(reason: impl AsRef<str> + Into<String>) -> Result<Self> {
+        Ok(Self {
+            status: Status::PERMANENT_FAILURE,
+            meta: Meta::new(reason)?,
+        })
+    }
+
+    pub fn not_found() -> Result<Self> {
+        Ok(Self {
+            status: Status::NOT_FOUND,
+            meta: Meta::new("Not found")?,
+        })
+    }
+
+    pub fn status(&self) -> &Status {
+        &self.status
+    }
+
+    pub fn meta(&self) -> &Meta {
+        &self.meta
+    }
+}
+
+#[derive(Debug,Copy,Clone,PartialEq,Eq)]
+pub struct Status(u8);
+
+impl Status {
+    pub const INPUT: Self = Self(10);
+    pub const SENSITIVE_INPUT: Self = Self(11);
+    pub const SUCCESS: Self = Self(20);
+    pub const REDIRECT_TEMPORARY: Self = Self(30);
+    pub const REDIRECT_PERMANENT: Self = Self(31);
+    pub const TEMPORARY_FAILURE: Self = Self(40);
+    pub const SERVER_UNAVAILABLE: Self = Self(41);
+    pub const CGI_ERROR: Self = Self(42);
+    pub const PROXY_ERROR: Self = Self(43);
+    pub const SLOW_DOWN: Self = Self(44);
+    pub const PERMANENT_FAILURE: Self = Self(50);
+    pub const NOT_FOUND: Self = Self(51);
+    pub const GONE: Self = Self(52);
+    pub const PROXY_REQUEST_REFUSED: Self = Self(53);
+    pub const BAD_REQUEST: Self = Self(59);
+    pub const CLIENT_CERTIFICATE_REQUIRED: Self = Self(60);
+
+    pub fn code(&self) -> u8 {
+        self.0
+    }
+
+    pub fn is_success(&self) -> bool {
+        self.category().is_success()
+    }
+
+    pub fn category(&self) -> StatusCategory {
+        let class = self.0 / 10;
+
+        match class {
+            1 => StatusCategory::Input,
+            2 => StatusCategory::Success,
+            3 => StatusCategory::Redirect,
+            4 => StatusCategory::TemporaryFailure,
+            5 => StatusCategory::PermanentFailure,
+            6 => StatusCategory::ClientCertificateRequired,
+            _ => StatusCategory::PermanentFailure,
+        }
+    }
+}
+
+#[derive(Copy,Clone,PartialEq,Eq)]
+pub enum StatusCategory {
+    Input,
+    Success,
+    Redirect,
+    TemporaryFailure,
+    PermanentFailure,
+    ClientCertificateRequired,
+}
+
+impl StatusCategory {
+    pub fn is_input(&self) -> bool {
+        *self == Self::Input
+    }
+
+    pub fn is_success(&self) -> bool {
+        *self == Self::Success
+    }
+
+    pub fn redirect(&self) -> bool {
+        *self == Self::Redirect
+    }
+
+    pub fn is_temporary_failure(&self) -> bool {
+        *self == Self::TemporaryFailure
+    }
+
+    pub fn is_permanent_failure(&self) -> bool {
+        *self == Self::PermanentFailure
+    }
+
+    pub fn is_client_certificate_required(&self) -> bool {
+        *self == Self::ClientCertificateRequired
+    }
+}
+
+#[derive(Debug,Clone,PartialEq,Eq,Default)]
+pub struct Meta(String);
+
+impl Meta {
+    pub fn new(meta: impl AsRef<str> + Into<String>) -> Result<Self> {
+        ensure!(!meta.as_ref().contains("\n"), "Meta must not contain newlines");
+
+        Ok(Self(meta.into()))
+    }
+
+    pub fn empty() -> Self {
+        Self::default()
+    }
+
+    pub fn as_str(&self) -> &str {
+        &self.0
+    }
+
+    pub fn to_mime(&self) -> Result<Mime> {
+        let mime = self.as_str().parse::<Mime>()?;
+        Ok(mime)
+    }
+}
+
+pub struct Response {
+    header: ResponseHeader,
+    body: Option<Body>,
+}
+
+impl Response {
+    pub fn new(header: ResponseHeader) -> Self {
+        Self {
+            header,
+            body: None,
+        }
+    }
+
+    pub fn input(prompt: impl AsRef<str> + Into<String>) -> Result<Self> {
+        let header = ResponseHeader::input(prompt)?;
+        Ok(Self::new(header))
+    }
+
+    pub fn success(mime: &Mime) -> Result<Self> {
+        let header = ResponseHeader::success(&mime)?;
+        Ok(Self::new(header))
+    }
+
+    pub fn server_error(reason: impl AsRef<str> + Into<String>) -> Result<Self>  {
+        let header = ResponseHeader::server_error(reason)?;
+        Ok(Self::new(header))
+    }
+
+    pub fn not_found() -> Result<Self> {
+        let header = ResponseHeader::not_found()?;
+        Ok(Self::new(header))
+    }
+
+    pub fn with_body(mut self, body: impl Into<Body>) -> Self {
+        self.body = Some(body.into());
+        self
+    }
+
+    pub fn header(&self) -> &ResponseHeader {
+        &self.header
+    }
+
+    pub fn take_body(&mut self) -> Option<Body> {
+        self.body.take()
+    }
+}
+
+pub enum Body {
+    Bytes(Vec<u8>),
+    Reader(Box<dyn AsyncRead + Send + Sync + Unpin>),
+}
+
+impl From<Vec<u8>> for Body {
+    fn from(bytes: Vec<u8>) -> Self {
+        Self::Bytes(bytes)
+    }
+}
+
+impl<'a> From<&'a [u8]> for Body {
+    fn from(bytes: &[u8]) -> Self {
+        Self::Bytes(bytes.to_owned())
+    }
+}
+
+impl From<String> for Body {
+    fn from(text: String) -> Self {
+        Self::Bytes(text.into_bytes())
+    }
+}
+
+impl<'a> From<&'a str> for Body {
+    fn from(text: &str) -> Self {
+        Self::Bytes(text.to_owned().into_bytes())
+    }
+}
+
+impl From<File> for Body {
+    fn from(file: File) -> Self {
+        Self::Reader(Box::new(file))
+    }
+}
diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000..dcd7b09
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,103 @@
+use std::path::Path;
+use mime::Mime;
+use percent_encoding::utf8_percent_encode;
+use anyhow::*;
+use tokio::{
+    fs::{self, File},
+    io,
+};
+use crate::{GEMINI_MIME, Response, gemini_mime};
+use itertools::Itertools;
+
+pub async fn serve_file<P: AsRef<Path>>(path: P, mime: &Mime) -> Result<Response> {
+    let path = path.as_ref();
+
+    let file = match File::open(path).await {
+        Ok(file) => file,
+        Err(err) => match err.kind() {
+            io::ErrorKind::NotFound => return Ok(Response::not_found()?),
+            _ => return Err(err.into()),
+        }
+    };
+
+    Ok(Response::success(&mime)?.with_body(file))
+}
+
+pub async fn serve_dir<D: AsRef<Path>, P: AsRef<Path>>(dir: D, virtual_path: &[P]) -> Result<Response> {
+    debug!("Dir: {}", dir.as_ref().display());
+    let dir = dir.as_ref().canonicalize()?;
+    let mut path = dir.to_path_buf();
+
+    for segment in virtual_path {
+        path.push(segment);
+    }
+
+    let path = path.canonicalize()?;
+
+    if !path.starts_with(&dir) {
+        return Ok(Response::not_found()?);
+    }
+
+    if !path.is_dir() {
+        let mime = guess_mime_from_path(&path);
+        return serve_file(path, &mime).await;
+    }
+
+    serve_dir_listing(path, virtual_path).await
+}
+
+async fn serve_dir_listing<P: AsRef<Path>, B: AsRef<Path>>(path: P, virtual_path: &[B]) -> Result<Response> {
+    use std::fmt::Write;
+
+    let mut dir = match fs::read_dir(path).await {
+        Ok(dir) => dir,
+        Err(err) => match err.kind() {
+            io::ErrorKind::NotFound => return Ok(Response::not_found()?),
+            _ => return Err(err.into()),
+        }
+    };
+
+    let breadcrumbs = virtual_path.iter().map(|segment| segment.as_ref().display()).join("/");
+    let mut listing = String::new();
+    
+    writeln!(listing, "# Index of /{}", breadcrumbs)?;
+    writeln!(listing)?;
+
+    if virtual_path.get(0).map(<_>::as_ref) != Some(Path::new("")) {
+        writeln!(listing, "=> .. 📁 ../")?;
+    }
+
+    while let Some(entry) = dir.next_entry().await? {
+        let file_name = entry.file_name();
+        let file_name = file_name.to_string_lossy();
+        let is_dir = entry.file_type().await?.is_dir();
+
+        writeln!(
+            listing,
+            "=> {link}{trailing_slash} {icon} {name}{trailing_slash}",
+            icon = if is_dir { '📁' } else { '📄' },
+            link = utf8_percent_encode(&file_name, percent_encoding::NON_ALPHANUMERIC),
+            trailing_slash = if is_dir { "/" } else { "" },
+            name = file_name,
+        )?;
+    }
+
+    Ok(Response::success(&gemini_mime()?)?.with_body(listing))
+}
+
+pub fn guess_mime_from_path<P: AsRef<Path>>(path: P) -> Mime {
+    let path = path.as_ref();
+    let extension = path.extension().and_then(|s| s.to_str());
+    let mime = match extension {
+        Some(extension) => match extension {
+            "gemini" => GEMINI_MIME,
+            "txt" => "text/plain",
+            "jpeg" | "jpg" | "jpe" => "image/jpeg",
+            "png" => "image/png",
+            _ => "application/octet-stream",
+        },
+        None => "application/octet-stream",
+    };
+    
+    mime.parse::<Mime>().unwrap_or(mime::APPLICATION_OCTET_STREAM)
+}