Method for creating dynamically additional transporters

lib/mailer.service.ts

@@ -16,12 +16,13 @@ import { TemplateAdapter } from './interfaces/template-adapter.interface';
 import { ISendMailOptions } from './interfaces/send-mail-options.interface';
 import { MailerTransportFactory as IMailerTransportFactory } from './interfaces/mailer-transport-factory.interface';
 import { MailerTransportFactory } from './mailer-transport.factory';
+import SMTPTransport = require('nodemailer/lib/smtp-transport');
 
 @Injectable()
 export class MailerService {
   private transporter!: Transporter;
   private transporters = new Map<string, Transporter>();
-
+  private templateAdapter: TemplateAdapter;
   private initTemplateAdapter(
     templateAdapter: TemplateAdapter,
     transporter: Transporter,
@@ -65,7 +66,7 @@ export class MailerService {
     }
 
     /** Adapter setup **/
-    const templateAdapter: TemplateAdapter = get(
+    this.templateAdapter = get(
       this.mailerOptions,
       'template.adapter',
     );
@@ -91,14 +92,14 @@ export class MailerService {
             this.mailerOptions.transports![name],
           ),
         );
-        this.initTemplateAdapter(templateAdapter, this.transporters.get(name)!);
+        this.initTemplateAdapter(this.templateAdapter, this.transporters.get(name)!);
       });
     }
 
     /** Transporter setup **/
     if (mailerOptions.transport) {
       this.transporter = this.transportFactory.createTransport();
-      this.initTemplateAdapter(templateAdapter, this.transporter);
+      this.initTemplateAdapter(this.templateAdapter, this.transporter);
     }
   }
 
@@ -126,4 +127,13 @@ export class MailerService {
       }
     }
   }
+
+  addTransporter(transporterName: string, config: string | SMTPTransport | SMTPTransport.Options): string {
+    this.transporters.set(
+      transporterName,
+      this.transportFactory.createTransport(config),
+    );
+    this.initTemplateAdapter(this.templateAdapter, this.transporters.get(transporterName)!);
+    return transporterName;
+  }
 }