chore: Extract authentication logic of the apps to their own classes

packages/backend/src/apps/smtp/authentication.ts

@@ -0,0 +1,40 @@
+import nodemailer from 'nodemailer';
+import App from '../../models/app';
+
+export default class Authentication {
+  client: any
+  connectionData: any
+  appData: any
+
+  constructor(connectionData: any) {
+    this.client = nodemailer.createTransport({
+      host: connectionData.host,
+      port: connectionData.port,
+      secure: connectionData.useTls,
+      auth: {
+        user: connectionData.username,
+        pass: connectionData.password,
+      },
+    });
+
+    this.connectionData = connectionData;
+    this.appData = App.findOneByKey('smtp');
+  }
+
+  async verifyCredentials() {
+    await this.client.verify()
+
+    return {
+      screenName: this.connectionData.username
+    }
+  }
+
+  async isStillVerified() {
+    try {
+      await this.client.verify()
+      return true;
+    } catch(error) {
+      return false
+    }
+  }
+}

packages/backend/src/apps/smtp/index.ts

@@ -1,40 +1,9 @@
-import nodemailer from 'nodemailer';
-import App from '../../models/app';
+import Authentication from './authentication';
 
 export default class SMTP {
-  client: any
-  connectionData: any
-  appData: any
+  authenticationClient: any
 
   constructor(connectionData: any) {
-    this.client = nodemailer.createTransport({
-      host: connectionData.host,
-      port: connectionData.port,
-      secure: connectionData.useTls,
-      auth: {
-        user: connectionData.username,
-        pass: connectionData.password,
-      },
-    });
-
-    this.connectionData = connectionData;
-    this.appData = App.findOneByKey('smtp');
-  }
-
-  async verifyCredentials() {
-    await this.client.verify()
-
-    return {
-      screenName: this.connectionData.username
-    }
-  }
-
-  async isStillVerified() {
-    try {
-      await this.client.verify()
-      return true;
-    } catch(error) {
-      return false
-    }
+    this.authenticationClient = new Authentication(connectionData);
   }
 }