feat(gui): Tor toggle (#300)

* re-add tor info box, show switch for toggling tor

* add use_tor to TauriSettings, only initialize tor client when it's true

* add warning log message when not using tor client

* change the label text of the switch, fail to align switch with SettingsBox icons

* move Tor settings to SettingsBox

Author: Einliterflasche

src-gui/src/renderer/components/pages/help/HelpPage.tsx

@@ -18,7 +18,7 @@ const useStyles = makeStyles((theme) => ({
 
 export default function HelpPage() {
   const classes = useStyles();
-  const location = useLocation(); 
+  const location = useLocation();
 
   useEffect(() => {
     if (location.hash) {

src-gui/src/renderer/components/pages/help/SettingsBox.tsx

@@ -44,6 +44,8 @@ import { Theme } from "renderer/components/theme";
 import { Add, ArrowUpward, Delete, Edit, HourglassEmpty } from "@material-ui/icons";
 import { getNetwork } from "store/config";
 import { currencySymbol } from "utils/formatUtils";
+import { setTorEnabled } from "store/features/settingsSlice";
+
 
 const PLACEHOLDER_ELECTRUM_RPC_URL = "ssl://blockstream.info:700";
 const PLACEHOLDER_MONERO_NODE_URL = "http://xmr-node.cakewallet.com:18081";
@@ -82,6 +84,7 @@ export default function SettingsBox() {
           <TableContainer>
             <Table>
               <TableBody>
+                <TorSettings />
                 <ElectrumRpcUrlSetting />
                 <MoneroNodeUrlSetting />
                 <FetchFiatPricesSetting />
@@ -489,4 +492,23 @@ function NodeTable({
       </Table>
     </TableContainer>
   )
-}
+}
+
+export function TorSettings() {
+  const dispatch = useAppDispatch();
+  const torEnabled = useSettings((settings) => settings.enableTor)
+  const handleChange = (event: React.ChangeEvent<HTMLInputElement>) => dispatch(setTorEnabled(event.target.checked));
+  const status = (state: boolean) => state === true ? "enabled" : "disabled";
+
+  return (
+    <TableRow>
+      <TableCell>
+        <SettingLabel label="Use Tor" tooltip="Tor (The Onion Router) is a decentralized network allowing for anonymous browsing. If enabled, the app will use its internal Tor client to hide your IP address from the maker. Requires a restart to take effect." />
+      </TableCell>
+
+      <TableCell>
+        <Switch checked={torEnabled} onChange={handleChange} color="primary" />
+      </TableCell>
+    </TableRow>
+  )
+}

src-gui/src/renderer/components/pages/help/TorInfoBox.tsx

@@ -175,6 +175,7 @@ export async function listSellersAtRendezvousPoint(
 export async function initializeContext() {
   const network = getNetwork();
   const testnet = isTestnet();
+  const useTor = store.getState().settings.enableTor;
 
   // This looks convoluted but it does the following:
   // - Fetch the status of all nodes for each blockchain in parallel
@@ -208,6 +209,7 @@ export async function initializeContext() {
   const tauriSettings: TauriSettings = {
     electrum_rpc_url: bitcoinNode,
     monero_node_url: moneroNode,
+    use_tor: useTor
   };
 
   logger.info("Initializing context with settings", tauriSettings);

src-gui/src/renderer/rpc.ts

@@ -9,6 +9,8 @@ export interface SettingsState {
   /// Whether to fetch fiat prices from the internet
   fetchFiatPrices: boolean;
   fiatCurrency: FiatCurrency;
+  /// Whether to enable Tor for p2p connections
+  enableTor: boolean
 }
 
 export enum FiatCurrency {
@@ -98,6 +100,7 @@ const initialState: SettingsState = {
   theme: Theme.Darker,
   fetchFiatPrices: true,
   fiatCurrency: FiatCurrency.Usd,
+  enableTor: true
 };
 
 const alertsSlice = createSlice({
@@ -134,6 +137,9 @@ const alertsSlice = createSlice({
     },
     resetSettings(_) {
       return initialState;
+    },
+    setTorEnabled(slice, action: PayloadAction<boolean>) {
+      slice.enableTor = action.payload;
     }
   },
 });
@@ -146,6 +152,7 @@ export const {
   resetSettings,
   setFetchFiatPrices,
   setFiatCurrency,
+  setTorEnabled,
 } = alertsSlice.actions;
 
 export default alertsSlice.reducer;

src-gui/src/store/features/settingsSlice.ts

@@ -18,7 +18,6 @@ use swap::cli::{
     command::{Bitcoin, Monero},
 };
 use tauri::{async_runtime::RwLock, Manager, RunEvent};
-use uuid::Uuid;
 
 /// Trait to convert Result<T, E> to Result<T, String>
 /// Tauri commands require the error type to be a string
@@ -327,7 +326,7 @@ async fn initialize_context(
         })
         .with_json(false)
         .with_debug(true)
-        .with_tor(true)
+        .with_tor(settings.use_tor)
         .with_tauri(tauri_handle.clone())
         .build()
         .await;

src-tauri/src/lib.rs

@@ -394,6 +394,12 @@ impl ContextBuilder {
         };
 
         let initialize_tor_client = async {
+            // Don't init a tor client unless we should use it.
+            if !self.tor {
+                tracing::warn!("Internal Tor client not enabled, skipping initialization");
+                return Ok(None);
+            }
+
             self.tauri_handle.emit_context_init_progress_event(
                 TauriContextStatusEvent::Initializing(vec![
                     TauriPartialInitProgress::EstablishingTorCircuits(

swap/src/cli/api.rs

@@ -133,7 +133,7 @@ impl TauriHandle {
             let request_id = Uuid::new_v4();
             let now_secs = SystemTime::now()
                 .duration_since(UNIX_EPOCH)
-                .unwrap()
+                .expect("it is later than the begin of the unix epoch")
                 .as_secs();
             let expiration_ts = now_secs + timeout_secs;
 
@@ -501,4 +501,6 @@ pub struct TauriSettings {
     /// The URL of the Electrum RPC server e.g `ssl://bitcoin.com:50001`
     #[typeshare(serialized_as = "string")]
     pub electrum_rpc_url: Option<Url>,
+    /// Whether to initialize and use a tor client.
+    pub use_tor: bool,
 }

swap/src/cli/api/tauri_bindings.rs

@@ -164,7 +164,7 @@ async fn next_state(
             let btc_lock_amount = bitcoin::Amount::from_sat(
                 signed_tx
                     .output
-                    .get(0)
+                    .first()
                     .context("Failed to get lock amount")?
                     .value,
             );