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/*
This file is part of gnix (https://codeberg.org/metamuffin/gnix)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2025 metamuffin <metamuffin.org>
*/
use super::{Node, NodeContext, NodeKind, NodeRequest, NodeResponse};
use crate::error::ServiceError;
use anyhow::{anyhow, Result};
use futures::TryStreamExt;
use http_body_util::{combinators::BoxBody, BodyExt, StreamBody};
use hyper::{
body::Frame,
header::{HeaderName, HeaderValue, CONTENT_LENGTH, CONTENT_TYPE},
Response, StatusCode,
};
use serde::Deserialize;
use serde_yml::Value;
use std::{
collections::BTreeMap, future::Future, io::ErrorKind, path::PathBuf, pin::Pin, process::Stdio,
str::FromStr, sync::Arc,
};
use tokio::{
io::{copy, AsyncBufReadExt, BufReader, BufWriter},
process::Command,
spawn,
};
use tokio_util::io::{ReaderStream, StreamReader};
use users::get_user_by_name;
pub struct CgiKind;
#[derive(Deserialize)]
struct CgiConfig {
bin: PathBuf,
#[serde(default)]
env: BTreeMap<String, String>,
user: Option<String>,
#[serde(default)]
args: Vec<String>,
}
struct Cgi {
config: CgiConfig,
user: Option<u32>,
}
impl NodeKind for CgiKind {
fn name(&self) -> &'static str {
"cgi"
}
fn instanciate(&self, config: Value) -> Result<Arc<dyn Node>> {
Ok(Arc::new(Cgi::new(serde_yml::from_value::<CgiConfig>(
config,
)?)?))
}
}
impl Cgi {
pub fn new(config: CgiConfig) -> Result<Self> {
Ok(Self {
user: config
.user
.as_ref()
.map(|u| {
get_user_by_name(u)
.map(|u| u.uid())
.ok_or(anyhow!("user does not exist"))
})
.transpose()?,
config,
})
}
}
impl Node for Cgi {
fn handle<'a>(
&'a self,
context: &'a mut super::NodeContext,
request: super::NodeRequest,
) -> Pin<Box<dyn Future<Output = Result<NodeResponse, ServiceError>> + Send + Sync + 'a>> {
Box::pin(async move {
let mut command = Command::new(&self.config.bin);
command.stdin(Stdio::piped());
command.stdout(Stdio::piped());
command.stderr(Stdio::inherit());
if let Some(uid) = self.user {
command.uid(uid);
}
command.envs(&self.config.env);
command.args(&self.config.args);
set_cgi_variables(&mut command, &request, context);
let mut child = command.spawn()?;
let mut stdout = BufReader::new(child.stdout.take().unwrap());
let mut stdin = BufWriter::new(child.stdin.take().unwrap());
// TODO prevent abuse
let mut body = StreamReader::new(
request
.into_body()
.into_data_stream()
.map_err(|_| std::io::Error::new(ErrorKind::BrokenPipe, "asd")),
);
spawn(async move { copy(&mut body, &mut stdin).await });
let mut line = String::new();
let mut response = Response::new(());
loop {
line.clear();
stdout.read_line(&mut line).await?;
let line = line.trim();
if line.is_empty() {
break;
}
let (key, value) = line.split_once(":").ok_or(ServiceError::Other)?;
let value = value.trim();
if key == "Status" {
*response.status_mut() = StatusCode::from_u16(
value.split_once(" ").unwrap_or((value, "")).0.parse()?,
)
.map_err(|_| ServiceError::InvalidHeader)?;
} else {
response.headers_mut().insert(
HeaderName::from_str(key).map_err(|_| ServiceError::InvalidHeader)?,
HeaderValue::from_str(value).map_err(|_| ServiceError::InvalidHeader)?,
);
}
}
Ok(response.map(|()| {
BoxBody::new(StreamBody::new(
ReaderStream::new(stdout)
.map_ok(Frame::data)
.map_err(ServiceError::Io),
))
}))
})
}
}
pub fn set_cgi_variables(command: &mut Command, request: &NodeRequest, context: &NodeContext) {
command.env(
"CONTENT_LENGTH",
request
.headers()
.get(CONTENT_LENGTH)
.and_then(|x| x.to_str().ok())
.unwrap_or_default(),
);
command.env(
"CONTENT_TYPE",
request
.headers()
.get(CONTENT_TYPE)
.and_then(|x| x.to_str().ok())
.unwrap_or_default(),
);
command.env("GATEWAY_INTERFACE", "CGI/1.1");
command.env("PATH_INFO", request.uri().path());
command.env("PATH_TRANSLATED", request.uri().path());
command.env("QUERY_STRING", request.uri().query().unwrap_or_default());
command.env("REMOTE_ADDR", context.addr.to_string());
// command.env("REMOTE_HOST", ));
// command.env("REMOTE_IDENT", ));
// command.env("REMOTE_USER", ));
command.env("REQUEST_METHOD", request.method().to_string());
// command.env("SCRIPT_NAME", );
// command.env("SERVER_NAME", );
// command.env("SERVER_PORT", );
command.env("SERVER_PROTOCOL", "HTTP/1.1");
command.env("SERVER_SOFTWARE", "gnix");
}
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