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//! Website Contact Form
// 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 axum::{
extract::{Form, State},
response::Html,
routing::post,
Router,
};
use chrono::Utc;
use serde::Deserialize;
use std::io::Write;
use std::path::PathBuf;
use std::process::{Command, Stdio};
use std::sync::Arc;
#[derive(Clone)]
struct AppConfig {
bind_addr: String,
cert_path: PathBuf,
inbox_dir: PathBuf,
sq_bin: PathBuf,
}
impl AppConfig {
fn from_env() -> Self {
let home = std::env::var("HOME").unwrap_or_else(|_| "/home/ops".into());
Self {
bind_addr: std::env::var("BIND_ADDR").unwrap_or_else(|_| "0.0.0.0:8085".into()),
cert_path: PathBuf::from(
std::env::var("CERT_PATH")
.unwrap_or_else(|_| format!("{}/stack/contact-cert.pgp", home)),
),
inbox_dir: PathBuf::from(
std::env::var("INBOX_DIR")
.unwrap_or_else(|_| format!("{}/stack/inbox", home)),
),
sq_bin: PathBuf::from(
std::env::var("SQ_BIN")
.unwrap_or_else(|_| format!("{}/.cargo/bin/sq", home)),
),
}
}
}
#[derive(Deserialize)]
struct ContactForm {
sender: Option<String>,
message: String,
}
#[tokio::main]
async fn main() {
let config = Arc::new(AppConfig::from_env());
let app = Router::new()
.route("/send-message", post(handle_message))
.with_state(config.clone());
let listener = tokio::net::TcpListener::bind(&config.bind_addr)
.await
.unwrap_or_else(|_| panic!("Failed to bind to {}", config.bind_addr));
println!("Contact backend listening on http://{}", config.bind_addr);
println!("Using PQC Cert: {:?}", config.cert_path);
println!("Storing inbox in: {:?}", config.inbox_dir);
axum::serve(listener, app).await.unwrap();
}
async fn handle_message(
State(config): State<Arc<AppConfig>>,
Form(form): Form<ContactForm>,
) -> Html<&'static str> {
let message = form.message.trim();
if message.is_empty() {
return Html(ERROR_PAGE);
}
let raw_sender = form.sender.as_deref().unwrap_or("").trim();
let sender_display = if raw_sender.is_empty() {
"Anonymous"
} else {
raw_sender
};
let now = Utc::now();
let timestamp_str = now.format("%Y-%m-%d_%H-%M-%S").to_string();
let sanitized_sender: String = raw_sender
.chars()
.filter(|c| c.is_ascii_alphanumeric() || *c == '-' || *c == '_')
.take(30)
.collect();
let filename = if sanitized_sender.is_empty() {
format!("{}.pgp", timestamp_str)
} else {
format!("{}_{}.pgp", timestamp_str, sanitized_sender)
};
let output_path = config.inbox_dir.join(filename);
let payload = format!(
"=== BEGIN MESSAGE ===\nSender: {}\nTimestamp: {}\n============================\n\n{}",
sender_display,
now.to_rfc3339(),
message
);
let mut child = match Command::new(&config.sq_bin)
.args([
"encrypt",
"--for-file",
config.cert_path.to_str().unwrap_or_default(),
"--without-signature",
])
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.spawn()
{
Ok(proc) => proc,
Err(e) => {
eprintln!("Failed to spawn sq binary ({:?}): {}", config.sq_bin, e);
return Html(ERROR_PAGE);
}
};
if let Some(mut stdin) = child.stdin.take() {
if stdin.write_all(payload.as_bytes()).is_err() {
return Html(ERROR_PAGE);
}
}
let output = match child.wait_with_output() {
Ok(out) => out,
Err(_) => return Html(ERROR_PAGE),
};
if !output.status.success() {
eprintln!(
"sq encryption failed: {}",
String::from_utf8_lossy(&output.stderr)
);
return Html(ERROR_PAGE);
}
if std::fs::write(&output_path, &output.stdout).is_err() {
eprintln!("Failed to write to file {:?}", output_path);
return Html(ERROR_PAGE);
}
Html(SUCCESS_PAGE)
}
const SUCCESS_PAGE: &str = r#"<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Message Sent</title>
<link rel="stylesheet" href="/styles.css">
</head>
<body>
<div id="page">
<div class="badge">[ JS-free ]</div>
<div id="content">
<pre>
<a href="/" class="logo">
____ ___ _ _ _
| _ \ / _ \ / \ | \ | |
| | | | | | |/ _ \ | \| |
| |_| | |_| / ___ \| |\ |
|____/ \___/_/ \_\_| \_| LUU DUC TAI
</a>
+------------------------------------------------------------------------------+
| [+] Success: Message encrypted and delivered to inbox. |
+------------------------------------------------------------------------------+
<a href="/"><-- Return to Home Page</a>
</pre>
<div class="source-footer">
<a href="https://git.doan.luuduct.ai/stack/tree/contact-service/src/main.rs">[ Source Code ]</a>
</div>
</div>
</div>
</body>
</html>"#;
const ERROR_PAGE: &str = r#"<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Error</title>
<link rel="stylesheet" href="/styles.css">
</head>
<body>
<pre>
[!] Error: Unable to process or encrypt message.
<a href="/message.html"><-- Try Again</a>
</pre>
</body>
</html>"#;
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