chore: modify mailer module

packages/hoppscotch-backend/src/errors.ts

@@ -691,13 +691,6 @@ export const MAILER_SMTP_USER_UNDEFINED = 'mailer/smtp_user_undefined' as const;
 export const MAILER_SMTP_PASSWORD_UNDEFINED =
   'mailer/smtp_password_undefined' as const;
 
-/**
- * MAILER_USE_GRANULAR environment variable is not defined
- * (MailerModule)
- */
-export const MAILER_USE_CUSTOM_CONFIGS_INVALID_VALUE =
-  'mailer/use_custom_configs_invalid_value' as const;
-
 /**
  * SharedRequest invalid request JSON format
  * (ShortcodeService)

packages/hoppscotch-backend/src/mailer/mailer.module.ts

@@ -4,11 +4,9 @@ import { HandlebarsAdapter } from '@nestjs-modules/mailer/dist/adapters/handleba
 import { MailerService } from './mailer.service';
 import { throwErr } from 'src/utils';
 import {
-  MAILER_FROM_ADDRESS_UNDEFINED,
   MAILER_SMTP_PASSWORD_UNDEFINED,
   MAILER_SMTP_URL_UNDEFINED,
   MAILER_SMTP_USER_UNDEFINED,
-  MAILER_USE_CUSTOM_CONFIGS_INVALID_VALUE,
 } from 'src/errors';
 import { ConfigService } from '@nestjs/config';
 import { loadInfraConfiguration } from 'src/infra-config/helper';
@@ -29,30 +27,57 @@ export class MailerModule {
     }
 
     // If mailer is ENABLED, return the module with configuration (service, listener, etc.)
-    let transportOption: TransportType;
 
-    const mailerAddressFrom =
+    // Determine transport configuration based on custom config flag
+    let transportOption = getTransportOption(env, config);
+    // Get mailer address from environment or config
+    const mailerAddressFrom = getMailerAddressFrom(env, config);
+
+    return {
+      module: MailerModule,
+      providers: [MailerService, MailerEventListener],
+      imports: [
+        NestMailerModule.forRoot({
+          transport: transportOption,
+          defaults: {
+            from: mailerAddressFrom,
+          },
+          template: {
+            dir: __dirname + '/templates',
+            adapter: new HandlebarsAdapter(),
+          },
+        }),
+      ],
+    };
+  }
+}
+
+function isEnabled(value) {
+  return value === 'true';
+}
+function getMailerAddressFrom(env, config): string {
+  return (
     env.INFRA.MAILER_ADDRESS_FROM ??
     config.get('MAILER_ADDRESS_FROM') ??
-      throwErr(MAILER_SMTP_URL_UNDEFINED);
+    throwErr(MAILER_SMTP_URL_UNDEFINED)
+  );
+}
+function getTransportOption(env, config): TransportType {
+  const useCustomConfigs = isEnabled(
+    env.INFRA.MAILER_USE_CUSTOM_CONFIGS ??
+      config.get('MAILER_USE_CUSTOM_CONFIGS'),
+  );
 
-    if (
-      (env.INFRA.MAILER_USE_CUSTOM_CONFIGS ??
-        config.get('MAILER_USE_CUSTOM_CONFIGS')) === 'false'
-    ) {
+  if (!useCustomConfigs) {
     console.log('Using simple mailer configuration');
-
-      transportOption =
+    return (
       env.INFRA.MAILER_SMTP_URL ??
       config.get('MAILER_SMTP_URL') ??
-        throwErr(MAILER_SMTP_URL_UNDEFINED);
-    } else if (
-      (env.INFRA.MAILER_USE_CUSTOM_CONFIGS ??
-        config.get('MAILER_USE_CUSTOM_CONFIGS')) === 'true'
-    ) {
-      console.log('Using advance mailer configuration');
-
-      transportOption = {
+      throwErr(MAILER_SMTP_URL_UNDEFINED)
+    );
+  } else {
+    console.log('Using advanced mailer configuration');
+    return {
       host: env.INFRA.MAILER_SMTP_HOST ?? config.get('MAILER_SMTP_HOST'),
       port: +env.INFRA.MAILER_SMTP_PORT ?? +config.get('MAILER_SMTP_PORT'),
       secure:
@@ -73,25 +98,5 @@ export class MailerModule {
           !!config.get('MAILER_TLS_REJECT_UNAUTHORIZED'),
       },
     };
-    } else {
-      throwErr(MAILER_USE_CUSTOM_CONFIGS_INVALID_VALUE);
-    }
-
-    return {
-      module: MailerModule,
-      providers: [MailerService, MailerEventListener],
-      imports: [
-        NestMailerModule.forRoot({
-          transport: transportOption,
-          defaults: {
-            from: mailerAddressFrom,
-          },
-          template: {
-            dir: __dirname + '/templates',
-            adapter: new HandlebarsAdapter(),
-          },
-        }),
-      ],
-    };
   }
 }