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// Copyright (C) 2026 Doan Luu Duc Tai <doan@luuduct.ai>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
use crate::service::Service;
use anyhow::Result;
use axum::{
Json, Router,
extract::{DefaultBodyLimit, State},
http::{HeaderMap, HeaderValue, StatusCode},
response::{IntoResponse, Response},
routing::{get, post},
};
use serde_json::{Value, json};
use std::path::{Path, PathBuf};
use std::sync::{Arc, Mutex};
use tokio::sync::Semaphore;
#[derive(Clone)]
struct App {
service: Arc<Mutex<Service>>,
permits: Arc<Semaphore>,
root: PathBuf,
origin: String,
}
fn secured(mut response: Response) -> Response {
for (name, value) in [
("cache-control", "no-store, max-age=0"),
(
"content-security-policy",
"default-src 'none'; script-src 'self' 'wasm-unsafe-eval'; worker-src 'self'; connect-src 'self'; style-src 'self'; img-src 'none'; base-uri 'none'; form-action 'none'; frame-ancestors 'none'; object-src 'none'",
),
("referrer-policy", "no-referrer"),
("x-content-type-options", "nosniff"),
("cross-origin-opener-policy", "same-origin"),
("cross-origin-resource-policy", "same-origin"),
(
"permissions-policy",
"camera=(), microphone=(), geolocation=(), payment=(), usb=()",
),
] {
response
.headers_mut()
.insert(name, HeaderValue::from_static(value));
}
response
}
async fn api(State(app): State<App>, headers: HeaderMap, Json(request): Json<Value>) -> Response {
if headers.get("origin").and_then(|value| value.to_str().ok()) != Some(app.origin.as_str()) {
return secured(
(
StatusCode::FORBIDDEN,
Json(json!({"error":"Origin rejected"})),
)
.into_response(),
);
}
let Ok(permit) = Arc::clone(&app.permits).try_acquire_owned() else {
return secured(
(
StatusCode::TOO_MANY_REQUESTS,
Json(json!({"error":"Server busy"})),
)
.into_response(),
);
};
let result = tokio::task::spawn_blocking(move || {
let _permit = permit;
app.service
.lock()
.map_err(|_| anyhow::anyhow!("Service unavailable"))?
.call(&request)
})
.await;
match result {
Ok(Ok(value)) => secured(Json(value).into_response()),
_ => secured((StatusCode::BAD_REQUEST,Json(json!({"error":"Request rejected. Unlock again if your session expired; check credentials, message limits, and conversation access."}))).into_response()),
}
}
async fn asset(State(app): State<App>, uri: axum::http::Uri) -> Response {
let (path, mime) = match uri.path() {
"/" => (
"crates/chat-server/web/index.html",
"text/html; charset=utf-8",
),
"/app.js" => (
"crates/chat-server/web/app.js",
"text/javascript; charset=utf-8",
),
"/worker.js" => (
"crates/chat-server/web/worker.js",
"text/javascript; charset=utf-8",
),
"/wasi.mjs" => (
"crates/chat-crypto/browser/wasi.mjs",
"text/javascript; charset=utf-8",
),
"/style.css" => (
"crates/chat-server/web/style.css",
"text/css; charset=utf-8",
),
"/crypto.wasm" => (
"target/wasm32-wasip1/release/stack-chat-crypto.wasm",
"application/wasm",
),
"/javascript.html" => (
"crates/chat-server/web/javascript.html",
"text/html; charset=utf-8",
),
"/SOURCE.tar.gz" => ("var/build/chat-source.tar.gz", "application/gzip"),
"/THIRD-PARTY-LICENSES.html" => {
("web/THIRD-PARTY-LICENSES.html", "text/html; charset=utf-8")
}
"/LIMITATIONS.txt" => ("docs/CHAT-APPLICATION.txt", "text/plain; charset=utf-8"),
"/LICENSE" => ("LICENSE", "text/plain; charset=utf-8"),
_ => return secured(StatusCode::NOT_FOUND.into_response()),
};
tokio::fs::read(app.root.join(path)).await.map_or_else(
|_| secured(StatusCode::NOT_FOUND.into_response()),
|bytes| secured(([("content-type", mime)], bytes).into_response()),
)
}
pub(crate) async fn serve(
listener: tokio::net::TcpListener,
service: Service,
root: &Path,
) -> Result<()> {
let app = App {
origin: service.origin.clone(),
service: Arc::new(Mutex::new(service)),
permits: Arc::new(Semaphore::new(4)),
root: root.to_path_buf(),
};
let routes = Router::new()
.route("/api", post(api))
.fallback(get(asset))
.layer(DefaultBodyLimit::max(262_144))
.with_state(app);
axum::serve(listener, routes)
.with_graceful_shutdown(async {
drop(tokio::signal::ctrl_c().await);
})
.await?;
Ok(())
}
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