260223:1415 20260223 nextJS & nestJS Best pratices

backend/src/common/exceptions/http-exception.filter.ts

@@ -1,5 +1,5 @@
 // File: src/common/exceptions/http-exception.filter.ts
-// บันทึกการแก้ไข: ปรับปรุง Global Filter ให้จัดการ Error ปลอดภัยสำหรับ Production และ Log ละเอียดใน Dev (T1.1)
+// Fix #3 & #4: แทน console.error ด้วย Logger, เพิ่ม ErrorResponseBody interface
 
 import {
   ExceptionFilter,
@@ -11,6 +11,16 @@ import {
 } from '@nestjs/common';
 import { Request, Response } from 'express';
 
+interface ErrorResponseBody {
+  statusCode: number;
+  timestamp: string;
+  path: string;
+  message?: unknown;
+  error?: string;
+  stack?: string;
+  [key: string]: unknown;
+}
+
 @Catch()
 export class HttpExceptionFilter implements ExceptionFilter {
   private readonly logger = new Logger(HttpExceptionFilter.name);
@@ -33,49 +43,46 @@ export class HttpExceptionFilter implements ExceptionFilter {
         : { message: 'Internal server error' };
 
     // จัดรูปแบบ Error Message ให้เป็น Object เสมอ
-    let errorBody: any =
+    let errorBody: Record<string, unknown> =
       typeof exceptionResponse === 'string'
         ? { message: exceptionResponse }
-        : exceptionResponse;
+        : (exceptionResponse as Record<string, unknown>);
 
     // 3. 📝 Logging Strategy (แยกตามความรุนแรง)
     if (status >= 500) {
       // 💥 Critical Error: Log stack trace เต็มๆ
       this.logger.error(
-        `💥 HTTP ${status} Error on ${request.method} ${request.url}`,
-        exception instanceof Error
-          ? exception.stack
-          : JSON.stringify(exception),
+        `HTTP ${status} Error on ${request.method} ${request.url}`,
+        exception instanceof Error ? exception.stack : JSON.stringify(exception)
       );
-
-      // 👇👇 สิ่งที่คุณต้องการ: Log ดิบๆ ให้เห็นชัดใน Docker Console 👇👇
-      console.error('💥 REAL CRITICAL ERROR:', exception);
     } else {
       // ⚠️ Client Error (400, 401, 403, 404): Log แค่ Warning พอ ไม่ต้อง Stack Trace
       this.logger.warn(
-        `⚠️ HTTP ${status} Error on ${request.method} ${request.url}: ${JSON.stringify(errorBody.message || errorBody)}`,
+        `HTTP ${status} Error on ${request.method} ${request.url}: ${JSON.stringify(errorBody['message'] ?? errorBody)}`
       );
     }
 
     // 4. 🔒 Security & Response Formatting
     // กรณี Production และเป็น Error 500 -> ต้องซ่อนรายละเอียดความผิดพลาดของ Server
-    if (status === 500 && process.env.NODE_ENV === 'production') {
+    if (status === 500 && process.env['NODE_ENV'] === 'production') {
       errorBody = {
         message: 'Internal server error',
-        // อาจเพิ่ม reference code เพื่อให้ user แจ้ง support ได้ เช่น code: 'ERR-500'
       };
     }
 
-    // 5. Construct Final Response
-    const responseBody = {
+    // 5. Construct Final Response (type-safe)
+    const responseBody: ErrorResponseBody = {
       statusCode: status,
       timestamp: new Date().toISOString(),
       path: request.url,
-      ...errorBody, // Spread message, error, validation details
+      ...errorBody,
     };
 
     // 🛠️ Development Mode: แถม Stack Trace ไปให้ Frontend Debug ง่ายขึ้น
-    if (process.env.NODE_ENV !== 'production' && exception instanceof Error) {
+    if (
+      process.env['NODE_ENV'] !== 'production' &&
+      exception instanceof Error
+    ) {
       responseBody.stack = exception.stack;
     }
 

backend/src/common/interceptors/audit-log.interceptor.ts

@@ -1,3 +1,7 @@
+// File: src/common/interceptors/audit-log.interceptor.ts
+// Fix #2: Replaced `as unknown as AuditLog` with CreateAuditLogPayload typed interface
+// Lint fixes: async-in-tap pattern, null vs undefined entityId, safe any handling
+
 import {
   CallHandler,
   ExecutionContext,
@@ -16,6 +20,17 @@ import { AuditLog } from '../entities/audit-log.entity';
 import { AUDIT_KEY, AuditMetadata } from '../decorators/audit.decorator';
 import { User } from '../../modules/user/entities/user.entity';
 
+/** Typed payload for creating AuditLog, replacing the `as unknown as AuditLog` cast */
+interface CreateAuditLogPayload {
+  userId: number | null | undefined;
+  action: string;
+  entityType?: string;
+  entityId?: string;
+  ipAddress?: string;
+  userAgent?: string;
+  severity: string;
+}
+
 @Injectable()
 export class AuditLogInterceptor implements NestInterceptor {
   private readonly logger = new Logger(AuditLogInterceptor.name);
@@ -23,13 +38,13 @@ export class AuditLogInterceptor implements NestInterceptor {
   constructor(
     private reflector: Reflector,
     @InjectRepository(AuditLog)
-    private auditLogRepo: Repository<AuditLog>,
+    private auditLogRepo: Repository<AuditLog>
   ) {}
 
-  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
+  intercept(context: ExecutionContext, next: CallHandler): Observable<unknown> {
     const auditMetadata = this.reflector.getAllAndOverride<AuditMetadata>(
       AUDIT_KEY,
-      [context.getHandler(), context.getClass()],
+      [context.getHandler(), context.getClass()]
     );
 
     if (!auditMetadata) {
@@ -37,44 +52,70 @@ export class AuditLogInterceptor implements NestInterceptor {
     }
 
     const request = context.switchToHttp().getRequest<Request>();
-    const user = (request as any).user as User;
-    const rawIp = request.ip || request.socket.remoteAddress;
-    const ip = Array.isArray(rawIp) ? rawIp[0] : rawIp;
+    const user = (request as Request & { user?: User }).user;
+    const rawIp: string | string[] | undefined =
+      request.ip ?? request.socket.remoteAddress;
+    const ip: string | undefined = Array.isArray(rawIp) ? rawIp[0] : rawIp;
     const userAgent = request.get('user-agent');
 
     return next.handle().pipe(
-      tap(async (data) => {
-        try {
-          let entityId = null;
-
-          if (data && typeof data === 'object') {
-            if ('id' in data) entityId = String(data.id);
-            else if ('audit_id' in data) entityId = String(data.audit_id);
-            else if ('user_id' in data) entityId = String(data.user_id);
-          }
-
-          if (!entityId && request.params.id) {
-            entityId = String(request.params.id);
-          }
-
-          // ✅ FIX: ใช้ user?.user_id || null
-          const auditLog = this.auditLogRepo.create({
-            userId: user ? user.user_id : null,
-            action: auditMetadata.action,
-            entityType: auditMetadata.entityType,
-            entityId: entityId,
-            ipAddress: ip,
-            userAgent: userAgent,
-            severity: 'INFO',
-          } as unknown as AuditLog); // ✨ Trick: Cast ผ่าน unknown เพื่อล้าง Error ถ้า TS ยังไม่อัปเดต
-
-          await this.auditLogRepo.save(auditLog);
-        } catch (error) {
-          this.logger.error(
-            `Failed to create audit log for ${auditMetadata.action}: ${(error as Error).message}`,
-          );
-        }
-      }),
+      // Use void for fire-and-forget: tap() does not support async callbacks
+      tap((data: unknown) => {
+        void this.saveAuditLog(
+          data,
+          auditMetadata,
+          request,
+          user,
+          ip,
+          userAgent
+        );
+      })
     );
   }
+
+  /** Extracted async method to aoid "Promise returned in tap" lint warning */
+  private async saveAuditLog(
+    data: unknown,
+    auditMetadata: AuditMetadata,
+    request: Request,
+    user: User | undefined,
+    ip: string | undefined,
+    userAgent: string | undefined
+  ): Promise<void> {
+    try {
+      let entityId: string | undefined;
+
+      if (data !== null && typeof data === 'object') {
+        const dataRecord = data as Record<string, unknown>;
+        if ('id' in dataRecord) {
+          entityId = String(dataRecord['id']);
+        } else if ('audit_id' in dataRecord) {
+          entityId = String(dataRecord['audit_id']);
+        } else if ('user_id' in dataRecord) {
+          entityId = String(dataRecord['user_id']);
+        }
+      }
+
+      if (!entityId && request.params['id']) {
+        entityId = String(request.params['id']);
+      }
+
+      const payload: CreateAuditLogPayload = {
+        userId: user?.user_id ?? null,
+        action: auditMetadata.action,
+        entityType: auditMetadata.entityType,
+        entityId,
+        ipAddress: ip,
+        userAgent,
+        severity: 'INFO',
+      };
+
+      const auditLog = this.auditLogRepo.create(payload as Partial<AuditLog>);
+      await this.auditLogRepo.save(auditLog);
+    } catch (error) {
+      this.logger.error(
+        `Failed to create audit log for ${auditMetadata.action}: ${(error as Error).message}`
+      );
+    }
+  }
 }

backend/src/common/interceptors/transform.interceptor.ts

@@ -1,3 +1,6 @@
+// File: src/common/interceptors/transform.interceptor.ts
+// Fix #1: แก้ไข `any` type ให้ถูกต้องตาม nestjs-best-practices (TypeScript Strict Mode)
+
 import {
   Injectable,
   NestInterceptor,
@@ -7,40 +10,67 @@ import {
 import { Observable } from 'rxjs';
 import { map } from 'rxjs/operators';
 
-export interface Response<T> {
+/** Metadata สำหรับ Paginated Response */
+export interface ResponseMeta {
+  total: number;
+  page: number;
+  limit: number;
+  totalPages: number;
+}
+
+/** Standard API Response Wrapper */
+export interface ApiResponse<T> {
   statusCode: number;
   message: string;
   data: T;
-  meta?: any;
+  meta?: ResponseMeta;
+}
+
+/** Internal shape สำหรับ paginated data ที่ service ส่งมา */
+interface PaginatedPayload<T> {
+  data: T[];
+  meta: ResponseMeta;
+  message?: string;
+}
+
+function isPaginatedPayload<T>(value: unknown): value is PaginatedPayload<T> {
+  return (
+    typeof value === 'object' &&
+    value !== null &&
+    'data' in value &&
+    'meta' in value &&
+    Array.isArray((value as PaginatedPayload<T>).data)
+  );
 }
 
 @Injectable()
 export class TransformInterceptor<T>
-  implements NestInterceptor<T, Response<T>>
+  implements NestInterceptor<T, ApiResponse<T>>
 {
   intercept(
     context: ExecutionContext,
-    next: CallHandler
-  ): Observable<Response<T>> {
+    next: CallHandler<T>
+  ): Observable<ApiResponse<T>> {
     return next.handle().pipe(
-      map((data: any) => {
-        const response = context.switchToHttp().getResponse();
+      map((data: T) => {
+        const response = context.switchToHttp().getResponse<{ statusCode: number }>();
 
         // Handle Pagination Response (Standardize)
         // ถ้า data มี structure { data: [], meta: {} } ให้ unzip ออกมา
-        if (data && data.data && data.meta) {
+        if (isPaginatedPayload(data)) {
           return {
             statusCode: response.statusCode,
-            message: data.message || 'Success',
-            data: data.data,
+            message: data.message ?? 'Success',
+            data: data.data as unknown as T,
             meta: data.meta,
           };
         }
 
+        const dataAsRecord = data as Record<string, unknown>;
         return {
           statusCode: response.statusCode,
-          message: data?.message || 'Success',
-          data: data?.result || data,
+          message: (dataAsRecord?.['message'] as string | undefined) ?? 'Success',
+          data: (dataAsRecord?.['result'] as T | undefined) ?? data,
         };
       })
     );