feat: load configuration from file

* import json config file & update the config (restore)
* export the config and save it to json file (backup)

src/lib/Server.js

@@ -265,6 +265,23 @@ module.exports = class Server {
       });
     };
 
+    // import_export
+    const router3 = createRouter();
+    app.use(router3);
+
+    router3
+      .get('/api/wireguard/dl', defineEventHandler((event) => {
+        const config = WireGuard.downloadConfiguration();
+        setHeader(event, 'Content-Disposition', 'attachment; filename="wg0.json"');
+        setHeader(event, 'Content-Type', 'text/json');
+        return config;
+      }))
+      .put('/api/wireguard/upload', defineEventHandler(async (event) => {
+        const { file } = await readBody(event);
+        await WireGuard.uploadConfiguration(file);
+        return { success: true }
+      }));
+
     // Static assets
     const publicDir = '/app/www';
     app.use(
@@ -276,7 +293,7 @@ module.exports = class Server {
           getMeta: async (id) => {
             const filePath = safePathJoin(publicDir, id);
 
-            const stats = await stat(filePath).catch(() => {});
+            const stats = await stat(filePath).catch(() => { });
             if (!stats || !stats.isFile()) {
               return;
             }

src/lib/WireGuard.js

@@ -111,7 +111,7 @@ PostDown = ${WG_POST_DOWN}
 [Peer]
 PublicKey = ${client.publicKey}
 ${client.preSharedKey ? `PresharedKey = ${client.preSharedKey}\n` : ''
-}AllowedIPs = ${client.address}/32`;
+        }AllowedIPs = ${client.address}/32`;
     }
 
     debug('Config saving...');
@@ -206,7 +206,7 @@ ${WG_MTU ? `MTU = ${WG_MTU}\n` : ''}\
 [Peer]
 PublicKey = ${config.server.publicKey}
 ${client.preSharedKey ? `PresharedKey = ${client.preSharedKey}\n` : ''
-}AllowedIPs = ${WG_ALLOWED_IPS}
+      }AllowedIPs = ${WG_ALLOWED_IPS}
 PersistentKeepalive = ${WG_PERSISTENT_KEEPALIVE}
 Endpoint = ${WG_HOST}:${WG_CONFIG_PORT}`;
   }
@@ -319,6 +319,17 @@ Endpoint = ${WG_HOST}:${WG_CONFIG_PORT}`;
     await this.saveConfig();
   }
 
+  async uploadConfiguration(config) {
+    const _config = JSON.parse(config);
+    await this.__saveConfig(_config);
+    await this.__syncConfig();
+  }
+
+  async downloadConfiguration() {
+    const config = await this.getConfig();
+    return JSON.stringify(config, null, 2);
+  }
+
   // Shutdown wireguard
   async Shutdown() {
     await Util.exec('wg-quick down wg0').catch(() => { });