refactor: error handling for email provider

Signed-off-by: pranalidhanavade <pranali.dhanavade@ayanworks.com>

Author: pranalidhanavade

apps/user/src/main.ts

@@ -1,11 +1,12 @@
+import { MicroserviceOptions, Transport } from '@nestjs/microservices';
+
+import { CommonConstants } from '@credebl/common/common.constant';
 import { HttpExceptionFilter } from 'libs/http-exception.filter';
 import { Logger } from '@nestjs/common';
 import { NestFactory } from '@nestjs/core';
+import NestjsLoggerServiceAdapter from '@credebl/logger/nestjsLoggerServiceAdapter';
 import { UserModule } from './user.module';
-import { MicroserviceOptions, Transport } from '@nestjs/microservices';
 import { getNatsOptions } from '@credebl/common/nats.config';
-import { CommonConstants } from '@credebl/common/common.constant';
-import NestjsLoggerServiceAdapter from '@credebl/logger/nestjsLoggerServiceAdapter';
 
 const logger = new Logger();
 
@@ -19,5 +20,24 @@ async function bootstrap(): Promise<void> {
 
   await app.listen();
   logger.log('User Microservice is listening to NATS ');
+  const supportedProviders = ['sendgrid', 'resend', 'smtp'] as const;
+  type EmailProvider = (typeof supportedProviders)[number];
+  const provider = process.env.EMAIL_PROVIDER?.toLowerCase();
+
+  if (!provider) {
+    Logger.warn(
+      `Email service is disabled because EMAIL_PROVIDER is not set. ` +
+        `Configure EMAIL_PROVIDER (sendgrid, resend, or smtp) to enable sending emails.`
+    );
+  } else if (!supportedProviders.includes(provider as EmailProvider)) {
+    Logger.warn(
+      `Unknown EMAIL_PROVIDER value "${process.env.EMAIL_PROVIDER}". ` +
+        `Supported providers are: sendgrid, resend, smtp. ` +
+        `Email service will be disabled.`
+    );
+  } else {
+    const Emailprovider = provider as EmailProvider;
+    logger.log(`Email provider configured: ${Emailprovider}`);
+  }
 }
 bootstrap();

libs/common/src/common.constant.ts

@@ -305,7 +305,9 @@ export enum CommonConstants {
   PLATFORM_ADMIN_EMAIL = 'platform.admin@yopmail.com',
   PLATFORM_ADMIN_ORG = 'Platform-admin',
   PLATFORM_ADMIN_ORG_ROLE = 'platform_admin',
-  DEFAULT_EMAIL_PROVIDER = 'sendgrid',
+  SENDGRID_EMAIL_PROVIDER = 'sendgrid',
+  RESEND_EMAIL_PROVIDER = 'resend',
+  SMTP_EMAIL_PROVIDER = 'smtp',
   USER_HOLDER_ROLE = 'holder',
 
   //onBoarding Type

libs/common/src/email.service.ts

@@ -11,31 +11,30 @@ export class EmailService {
   private readonly logger = new Logger(EmailService.name);
 
   async sendEmail(emailDto: EmailDto): Promise<boolean> {
-    const provider = process.env.EMAIL_PROVIDER?.toLowerCase() || CommonConstants.DEFAULT_EMAIL_PROVIDER;
+    const provider = process.env.EMAIL_PROVIDER?.toLowerCase();
 
     this.logger.debug(`Email Provider is: ${provider}`);
     let result: boolean;
 
     try {
       switch (provider) {
-        case 'sendgrid':
+        case CommonConstants.RESEND_EMAIL_PROVIDER:
           result = await sendWithSendGrid(emailDto);
           break;
-        case 'resend':
+        case CommonConstants.RESEND_EMAIL_PROVIDER:
           result = await sendWithResend(emailDto);
           break;
-        case 'smtp':
+        case CommonConstants.SMTP_EMAIL_PROVIDER:
           result = await sendWithSMTP(emailDto);
           break;
         default:
-          this.logger.warn(`Unknown email provider: ${provider}, defaulting to SendGrid.`);
-          result = await sendWithSendGrid(emailDto);
+          this.logger.warn(`Unknown email provider: ${provider}`);
+          return false;
       }
     } catch (error) {
       this.logger.error(`Failed to send email using ${provider}: ${error.message}`);
       throw error;
     }
-
     return result;
   }
 }