Add embedded Tor support

gui/electron/tor.js

@@ -0,0 +1,35 @@
+const { spawn } = require('child_process');
+const path = require('path');
+const getPort = require('get-port');
+
+async function launchTor() {
+  const socks = await getPort();
+  const control = await getPort();
+  const exe = path.join(__dirname, 'resources', 'tor', process.platform,
+                        process.platform === 'win32' ? 'tor.exe' : 'tor');
+  const obfs4 = path.join(__dirname, 'resources', 'tor', process.platform,
+                         process.platform === 'win32' ? 'obfs4proxy.exe' : 'obfs4proxy');
+
+  const args = [
+    'SocksPort', socks,
+    'ControlPort', control,
+    'Log', 'notice stdout',
+    'UseBridges', '1',
+    'ClientTransportPlugin', `obfs4 exec ${obfs4}`,
+    'BridgeBootstrap', '1'
+  ];
+
+  return new Promise((res, rej) => {
+    const tor = spawn(exe, args, { stdio: ['ignore', 'pipe', 'inherit'] });
+    tor.stdout.on('data', b => {
+      const line = b.toString();
+      if (global.mainWindow)
+        global.mainWindow.webContents.send('log', { text: `[tor] ${line.trim()}` });
+      if (line.includes('Bootstrapped 100%'))
+        res({ torProc: tor, socksPort: socks, controlPort: control });
+    });
+    tor.on('error', rej);
+  });
+}
+
+module.exports = { launchTor };