feat(sync): add modules for pairing and syncing clipboard data

src-tauri/src/main.rs

@@ -3,6 +3,7 @@
 mod api;
 mod db;
 mod utils;
+mod sync;
 
 use sqlx::sqlite::SqlitePoolOptions;
 use std::fs;
@@ -10,11 +11,13 @@ use tauri::Manager;
 use tauri_plugin_aptabase::{ EventTracker, InitOptions };
 use tauri_plugin_autostart::MacosLauncher;
 use tauri_plugin_prevent_default::Flags;
+use sync::sync::ClipboardSync;
+use sync::pairing::PairingManager;
+use tokio::sync::Mutex;
+use std::sync::Arc;
 
-fn main() {
-    let runtime = tokio::runtime::Runtime::new().expect("Failed to create Tokio runtime");
-    let _guard = runtime.enter();
-
+#[tokio::main]
+async fn main() {
     tauri::Builder
         ::default()
         .plugin(tauri_plugin_clipboard::init())
@@ -69,38 +72,52 @@ fn main() {
             }
 
             let db_url = format!("sqlite:{}", db_path.to_str().unwrap());
-
             let app_handle = app.handle().clone();
 
-            let app_handle_clone = app_handle.clone();
-            tauri::async_runtime::spawn(async move {
-                let pool = SqlitePoolOptions::new()
-                    .max_connections(5)
-                    .connect(&db_url).await
-                    .expect("Failed to create pool");
+            // Create the pool in a separate tokio runtime
+            let pool = tokio::runtime::Runtime
+                ::new()
+                .unwrap()
+                .block_on(async {
+                    SqlitePoolOptions::new()
+                        .max_connections(5)
+                        .connect(&db_url).await
+                        .expect("Failed to create pool")
+                });
 
-                app_handle_clone.manage(pool);
-            });
+            app_handle.manage(pool);
 
             let main_window = app.get_webview_window("main");
 
-            let _ = db::database::setup(app);
+            db::database::setup(app).expect("Failed to setup database");
             api::hotkeys::setup(app_handle.clone());
-            api::tray::setup(app)?;
-            api::clipboard::setup(app.handle());
-            let _ = api::clipboard::start_monitor(app_handle.clone());
+            api::tray::setup(app).expect("Failed to setup tray");
+            api::clipboard::setup(&app_handle);
+            api::clipboard::start_monitor(app_handle.clone()).expect("Failed to start monitor");
+
+            let pairing_manager = PairingManager::new();
+            let encryption_key = pairing_manager.get_encryption_key().clone();
+            let nonce = pairing_manager.get_nonce().clone();
+            app_handle.manage(pairing_manager);
+
+            let clipboard_sync = ClipboardSync::new(&encryption_key, &nonce);
+            let clipboard_sync_arc = Arc::new(Mutex::new(clipboard_sync));
+            app_handle.manage(clipboard_sync_arc.clone());
+
+            let clipboard_sync_clone = clipboard_sync_arc.clone();
+            let app_handle_clone = app_handle.clone();
+            tauri::async_runtime::spawn(async move {
+                let sync = clipboard_sync_clone.lock().await;
+                sync.listen_webhook(app_handle_clone, clipboard_sync_clone).await;
+            });
 
             utils::commands::center_window_on_current_monitor(main_window.as_ref().unwrap());
-            main_window
+            let _ = main_window
                 .as_ref()
                 .map(|w| w.hide())
-                .unwrap_or(Ok(()))?;
+                .expect("Failed to hide window");
 
-            let _ = app.track_event("app_started", None);
-
-            tauri::async_runtime::spawn(async move {
-                api::updater::check_for_updates(app_handle, false).await;
-            });
+            app.track_event("app_started", None).expect("Failed to track event");
 
             Ok(())
         })
@@ -124,7 +141,11 @@ fn main() {
                 db::history::read_image,
                 db::settings::get_setting,
                 db::settings::save_setting,
-                utils::commands::fetch_page_meta
+                utils::commands::fetch_page_meta,
+                sync::pairing::initiate_pairing,
+                sync::pairing::complete_pairing,
+                sync::sync::send_clipboard_data,
+                sync::sync::receive_clipboard_data
             ]
         )
         .run(tauri::generate_context!())

src-tauri/src/sync/mod.rs

@@ -0,0 +1,2 @@
+pub mod pairing;
+pub mod sync;

src-tauri/src/sync/pairing.rs

@@ -0,0 +1,112 @@
+use aes_gcm::{ Aes256Gcm, KeyInit };
+use aes_gcm::aead::Aead;
+use base64::{ engine::general_purpose::STANDARD, Engine };
+use rand::{ Rng, thread_rng };
+use rand::seq::SliceRandom;
+use serde::{ Deserialize, Serialize };
+use tauri::State;
+use uuid::Uuid;
+
+const EMOJI_POOL: &[&str] = &["😀", "😁", "😂", "🤣", "😃", "😄", "😅", "😆", "😉", "😊"];
+const PAIRING_KEY_LENGTH: usize = 4;
+
+#[derive(Serialize, Deserialize)]
+pub struct PairingRequest {
+    pub inviter_id: String,
+    pub invitation_code: String,
+}
+
+pub struct PairingManager {
+    pairing_key: String,
+    encryption_key: [u8; 32],
+    nonce: [u8; 12],
+}
+
+impl PairingManager {
+    pub fn new() -> Self {
+        let mut rng = thread_rng();
+        let pairing_key = Self::generate_emoji_sequence(&mut rng);
+        let encryption_key: [u8; 32] = rng.gen();
+        let nonce: [u8; 12] = rng.gen();
+        PairingManager {
+            pairing_key,
+            encryption_key,
+            nonce,
+        }
+    }
+
+    pub fn generate_emoji_sequence(rng: &mut impl Rng) -> String {
+        let key: Vec<&str> = EMOJI_POOL.choose_multiple(rng, PAIRING_KEY_LENGTH).cloned().collect();
+        key.join(" ")
+    }
+
+    pub fn validate_pairing(&self, input_key: &str) -> bool {
+        self.pairing_key == input_key
+    }
+
+    pub fn get_encryption_key(&self) -> &[u8; 32] {
+        &self.encryption_key
+    }
+
+    pub fn get_nonce(&self) -> &[u8; 12] {
+        &self.nonce
+    }
+
+    pub fn generate_invitation_code(&self) -> String {
+        Uuid::new_v4().to_string()
+    }
+
+    pub fn encrypt_key(&self, key: &[u8; 32]) -> Result<String, String> {
+        let cipher = Aes256Gcm::new(&self.encryption_key.into());
+        let ciphertext = cipher
+            .encrypt(&self.nonce.into(), key.as_ref())
+            .map_err(|e| e.to_string())?;
+        Ok(STANDARD.encode(ciphertext))
+    }
+
+    pub fn decrypt_key(&self, encrypted_key: &str) -> Result<[u8; 32], String> {
+        let ciphertext = STANDARD.decode(encrypted_key).map_err(|e| e.to_string())?;
+        let cipher = Aes256Gcm::new(&self.encryption_key.into());
+        let plaintext = cipher
+            .decrypt(&self.nonce.into(), ciphertext.as_ref())
+            .map_err(|e| e.to_string())?;
+        let mut key = [0u8; 32];
+        key.copy_from_slice(&plaintext);
+        Ok(key)
+    }
+
+    pub fn create_pairing_request(&self, inviter_id: String) -> PairingRequest {
+        PairingRequest {
+            inviter_id,
+            invitation_code: self.generate_invitation_code(),
+        }
+    }
+
+    pub fn handle_pairing_response(&self, response: PairingRequest) -> bool {
+        self.validate_pairing(&response.invitation_code)
+    }
+}
+
+#[tauri::command]
+pub fn initiate_pairing(_pairing_manager: State<'_, PairingManager>) -> String {
+    let mut rng = thread_rng();
+    PairingManager::generate_emoji_sequence(&mut rng)
+}
+
+#[tauri::command]
+pub fn complete_pairing(
+    input_key: String,
+    pairing_manager: State<'_, PairingManager>
+) -> Result<String, String> {
+    if pairing_manager.validate_pairing(&input_key) {
+        let _shared_key = pairing_manager.encryption_key.to_vec();
+        Ok("Pairing successful".to_string())
+    } else {
+        Err("Invalid pairing key".to_string())
+    }
+}
+
+#[tauri::command]
+pub fn generate_invitation(pairing_manager: State<'_, PairingManager>) -> String {
+    pairing_manager.generate_invitation_code()
+}

src-tauri/src/sync/sync.rs

@@ -0,0 +1,92 @@
+use aes_gcm::{Aes256Gcm, KeyInit, Nonce};
+use aes_gcm::aead::Aead;
+use base64::{engine::general_purpose::STANDARD, Engine};
+use reqwest::Client;
+use serde::{Deserialize, Serialize};
+use tauri::{AppHandle, Emitter};
+use tokio::sync::Mutex;
+use std::sync::Arc;
+use typenum::U12;
+
+const KVS_URL: &str = "https://kvs.wireway.ch";
+
+#[derive(Serialize, Deserialize, Clone)]
+pub struct ClipData {
+    content: String,
+    content_type: String,
+    timestamp: u64,
+}
+
+#[derive(Clone)]
+pub struct ClipboardSync {
+    client: Client,
+    cipher: Aes256Gcm,
+    nonce: Nonce<U12>,
+}
+
+impl ClipboardSync {
+    pub fn new(encryption_key: &[u8; 32], nonce_bytes: &[u8; 12]) -> Self {
+        let cipher = Aes256Gcm::new(encryption_key.into());
+        let nonce = Nonce::from_slice(nonce_bytes).clone();
+        ClipboardSync {
+            client: Client::new(),
+            cipher,
+            nonce,
+        }
+    }
+
+    pub async fn send_clipboard(&self, clip: ClipData) -> Result<(), String> {
+        let plaintext = serde_json::to_string(&clip).map_err(|e| e.to_string())?;
+        let ciphertext = self.cipher.encrypt(&self.nonce, plaintext.as_bytes()).map_err(|e| e.to_string())?;
+        let encoded = STANDARD.encode(ciphertext);
+        self.client
+            .post(&format!("{}/clipboard", KVS_URL))
+            .json(&serde_json::json!({
+                "key": "clipboard",
+                "value": encoded,
+                "expires_in": 60
+            }))
+            .send()
+            .await
+            .map_err(|e| e.to_string())?;
+        Ok(())
+    }
+
+    pub async fn receive_clipboard(&self, app_handle: AppHandle) -> Result<(), String> {
+        let res = self.client.get(&format!("{}/clipboard", KVS_URL)).send().await.map_err(|e| e.to_string())?;
+        if res.status().is_success() {
+            let json: serde_json::Value = res.json().await.map_err(|e| e.to_string())?;
+            if let Some(encoded) = json["value"].as_str() {
+                let ciphertext = STANDARD.decode(encoded).map_err(|e| e.to_string())?;
+                let plaintext = self.cipher.decrypt(&self.nonce, ciphertext.as_ref()).map_err(|e| e.to_string())?;
+                let clip_str = String::from_utf8(plaintext).map_err(|e| e.to_string())?;
+                let clip: ClipData = serde_json::from_str(&clip_str).map_err(|e| e.to_string())?;
+                app_handle.emit("clipboard-update", clip).map_err(|e| e.to_string())?;
+            }
+        }
+        Ok(())
+    }
+
+    pub async fn listen_webhook(&self, app_handle: AppHandle, state: Arc<Mutex<Self>>) {
+        tokio::spawn(async move {
+            loop {
+                if let Err(_) = state.lock().await.receive_clipboard(app_handle.clone()).await {
+                    tokio::time::sleep(tokio::time::Duration::from_secs(10)).await;
+                }
+                tokio::time::sleep(tokio::time::Duration::from_secs(60)).await;
+            }
+        });
+    }
+}
+
+#[tauri::command]
+pub async fn send_clipboard_data(clip: ClipData, sync: tauri::State<'_, Arc<Mutex<ClipboardSync>>>) -> Result<(), String> {
+    let sync = sync.lock().await;
+    sync.send_clipboard(clip).await
+}
+
+#[tauri::command]
+pub async fn receive_clipboard_data(app_handle: AppHandle, sync: tauri::State<'_, Arc<Mutex<ClipboardSync>>>) -> Result<(), String> {
+    let sync = sync.lock().await;
+    sync.receive_clipboard(app_handle).await
+}