init user system with keycloak

src/main.ts

@@ -1,9 +1,64 @@
 import { NestFactory } from '@nestjs/core';
+import { ValidationPipe, Logger } from '@nestjs/common';
+import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
 import { AppModule } from './app.module';
+import { AllExceptionsFilter } from './common/filters/all-exceptions.filter';
 
 async function bootstrap() {
+  const logger = new Logger('Bootstrap');
   const app = await NestFactory.create(AppModule);
-  await app.listen(process.env.PORT ?? 3000);
+
+  // Enable global exception filter for consistent error responses
+  app.useGlobalFilters(new AllExceptionsFilter());
+
+  // Enable global validation pipe for DTO validation
+  app.useGlobalPipes(
+    new ValidationPipe({
+      // Strip properties that are not in the DTO
+      whitelist: true,
+      // Throw error if non-whitelisted properties are present
+      forbidNonWhitelisted: true,
+      // Automatically transform payloads to DTO instances
+      transform: true,
+      // Provide detailed error messages
+      disableErrorMessages: false,
+    }),
+  );
+
+  // Configure Swagger documentation
+  const config = new DocumentBuilder()
+    .setTitle('Friendolls API')
+    .setDescription(
+      'API for managing users in Friendolls application.\n\n' +
+        'Authentication is handled via Keycloak OpenID Connect.\n' +
+        'Users must authenticate via Keycloak to obtain a JWT token.\n\n' +
+        'Include the JWT token in the Authorization header as: `Bearer <token>`',
+    )
+    .setVersion('1.0')
+    .addBearerAuth(
+      {
+        type: 'http',
+        scheme: 'bearer',
+        bearerFormat: 'JWT',
+        name: 'Authorization',
+        description: 'Enter JWT token obtained from Keycloak',
+        in: 'header',
+      },
+      'bearer',
+    )
+    .addTag('users', 'User profile management endpoints')
+    .build();
+
+  const document = SwaggerModule.createDocument(app, config);
+  SwaggerModule.setup('api', app, document);
+
+  const port = process.env.PORT ?? 3000;
+  await app.listen(port);
+
+  logger.log(`Application is running on: http://localhost:${port}`);
+  logger.log(
+    `Swagger documentation available at: http://localhost:${port}/api`,
+  );
 }
 
 void bootstrap();