From e3f22606a6889796b3f66b5af95d488a0d229a41 Mon Sep 17 00:00:00 2001
From: Dorian Zedler <dorian@itsblue.de>
Date: Thu, 9 Feb 2023 13:26:24 +0100
Subject: [PATCH] Feat: rust receiver

---
 receiver/.gitignore  |   1 +
 receiver/Cargo.lock  | 768 +++++++++++++++++++++++++++++++++++++++++++
 receiver/Cargo.toml  |  16 +
 receiver/src/main.rs |  89 +++++
 4 files changed, 874 insertions(+)
 create mode 100644 receiver/.gitignore
 create mode 100644 receiver/Cargo.lock
 create mode 100644 receiver/Cargo.toml
 create mode 100644 receiver/src/main.rs

diff --git a/receiver/.gitignore b/receiver/.gitignore
new file mode 100644
index 0000000..1de5659
--- /dev/null
+++ b/receiver/.gitignore
@@ -0,0 +1 @@
+target
\ No newline at end of file
diff --git a/receiver/Cargo.lock b/receiver/Cargo.lock
new file mode 100644
index 0000000..9f3db45
--- /dev/null
+++ b/receiver/Cargo.lock
@@ -0,0 +1,768 @@
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diff --git a/receiver/Cargo.toml b/receiver/Cargo.toml
new file mode 100644
index 0000000..170ac75
--- /dev/null
+++ b/receiver/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "receiver"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+base64 = "0.21.0"
+hex = "0.4.3"
+paho-mqtt = "0.12.0"
+pbkdf2 = "0.11.0"
+crypto_helper = {path = "../crypto_helper"}
+uuid = { version = "1.3.0", features = ["serde", "v4"] }
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
\ No newline at end of file
diff --git a/receiver/src/main.rs b/receiver/src/main.rs
new file mode 100644
index 0000000..d4ee8cd
--- /dev/null
+++ b/receiver/src/main.rs
@@ -0,0 +1,89 @@
+use std::{env, process, time::Duration, fmt::format};
+use serde::{Deserialize, Serialize};
+use serde_json::Result;
+
+extern crate paho_mqtt as mqtt;
+
+const BROKER: &str = "tcp://broker.emqx.io:1883";
+
+#[derive(Serialize, Deserialize, PartialEq)]
+enum MqttMessageKind {
+    Time,
+    Confirm,
+}
+
+#[derive(Serialize, Deserialize)]
+struct MqttMessage {
+    id: uuid::Uuid,
+    kind: MqttMessageKind,
+    time: u32,
+}
+
+fn init_mqtt(uri: &str, topic: &str) -> mqtt::Result<(mqtt::Client, mqtt::Receiver<Option<mqtt::Message>>)> {
+    let create_opts = mqtt::CreateOptionsBuilder::new()
+        .server_uri(uri)
+        .finalize();
+
+    // Create a client.
+    let cli = mqtt::Client::new(create_opts)?;
+
+    // Define the set of options for the connection.
+    let conn_opts = mqtt::ConnectOptionsBuilder::new()
+        .keep_alive_interval(Duration::from_secs(20))
+        .clean_session(true)
+        .finalize();
+
+    let rx = cli.start_consuming();
+
+    // Connect and wait for it to complete or fail.
+    cli.connect(conn_opts)?;
+
+    cli.subscribe(topic, 1)?;
+
+    Ok((cli, rx))
+}
+
+fn main() {
+    let password = "test";
+    let broker_domain = "broker.emqx.io";
+    let broker_url = format!("tcp://{}:1883", broker_domain);
+
+    let c = crypto_helper::crypto::Crypto::new("test", "broker.emqx.io");
+
+    let topic = format!("org.speedclimbing.ok-ready-go.{password}");
+    let topic = crypto_helper::crypto::Crypto::sha256(&c.encrypt(&topic));
+
+    let (cli, rx) = init_mqtt(&broker_url, &topic).unwrap();
+
+    println!("Processing requests...");
+    for msg in rx.iter() {
+        if let Some(msg) = msg {
+            let msg = msg.payload_str();
+
+            let msg = c.decrypt(&msg);
+            println!("Got: {}", msg);
+            let msg: MqttMessage = serde_json::from_str(&msg).unwrap();
+            if msg.kind != MqttMessageKind::Time {
+                continue;
+            }
+
+            println!("Got time: {} with id {}", msg.time, msg.id);
+
+            let reply = MqttMessage {
+                id: msg.id,
+                kind: MqttMessageKind::Confirm,
+                time: 0,
+            };
+
+            let reply = serde_json::to_string(&reply).unwrap();
+            let reply = c.encrypt(&reply);
+            println!("Sending reply: {reply}");
+            let reply = mqtt::Message::new(&topic, reply, 1);
+            cli.publish(reply).expect("publish");
+        }
+        else if !cli.is_connected() {
+            break;
+        }
+    }
+
+}