fix(vpn-manager): persist WireGuard private keys for valid client exports and QR codes

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@serve.zone/dcrouter',
-  version: '11.20.0',
+  version: '11.20.1',
   description: 'A multifaceted routing service handling mail and SMS delivery functions.'
 }

ts/vpn/classes.vpn-manager.ts

@@ -46,6 +46,8 @@ interface IPersistedClient {
   assignedIp?: string;
   noisePublicKey: string;
   wgPublicKey: string;
+  /** WireGuard private key — stored so exports and QR codes produce valid configs */
+  wgPrivateKey?: string;
   createdAt: number;
   updatedAt: number;
   expiresAt?: string;
@@ -188,7 +190,7 @@ export class VpnManager {
       description: opts.description,
     });
 
-    // Persist client entry (without private keys)
+    // Persist client entry (including WG private key for export/QR)
     const persisted: IPersistedClient = {
       clientId: bundle.entry.clientId,
       enabled: bundle.entry.enabled ?? true,
@@ -197,6 +199,7 @@ export class VpnManager {
       assignedIp: bundle.entry.assignedIp,
       noisePublicKey: bundle.entry.publicKey,
       wgPublicKey: bundle.entry.wgPublicKey || '',
+      wgPrivateKey: bundle.secrets?.wgPrivateKey,
       createdAt: Date.now(),
       updatedAt: Date.now(),
       expiresAt: bundle.entry.expiresAt,
@@ -265,11 +268,12 @@ export class VpnManager {
     if (!this.vpnServer) throw new Error('VPN server not running');
     const bundle = await this.vpnServer.rotateClientKey(clientId);
 
-    // Update persisted entry with new public keys
+    // Update persisted entry with new keys (including private key for export/QR)
     const client = this.clients.get(clientId);
     if (client) {
       client.noisePublicKey = bundle.entry.publicKey;
       client.wgPublicKey = bundle.entry.wgPublicKey || '';
+      client.wgPrivateKey = bundle.secrets?.wgPrivateKey;
       client.updatedAt = Date.now();
       await this.persistClient(client);
     }
@@ -278,11 +282,24 @@ export class VpnManager {
   }
 
   /**
-   * Export a client config (without secrets).
+   * Export a client config. Injects the stored WG private key for complete configs.
    */
   public async exportClientConfig(clientId: string, format: 'smartvpn' | 'wireguard'): Promise<string> {
     if (!this.vpnServer) throw new Error('VPN server not running');
-    return this.vpnServer.exportClientConfig(clientId, format);
+    let config = await this.vpnServer.exportClientConfig(clientId, format);
+
+    // Inject stored WG private key so exports produce valid, scannable configs
+    if (format === 'wireguard') {
+      const persisted = this.clients.get(clientId);
+      if (persisted?.wgPrivateKey) {
+        config = config.replace(
+          '[Interface]\n',
+          `[Interface]\nPrivateKey = ${persisted.wgPrivateKey}\n`,
+        );
+      }
+    }
+
+    return config;
   }
 
   // ── Tag-based access control ───────────────────────────────────────────