feat: add thumbnail upload support to course creation endpoint with multipart form data handling.

Backend/src/controllers/CoursesInstructorController.ts

@@ -1,4 +1,4 @@
-import { Get, Body, Post, Route, Tags, SuccessResponse, Response, Security, Put, Path, Delete, Request, Example } from 'tsoa';
+import { Get, Body, Post, Route, Tags, SuccessResponse, Response, Security, Put, Path, Delete, Request, Example, FormField, UploadedFile } from 'tsoa';
 import { ValidationError } from '../middleware/errorHandler';
 import { CoursesInstructorService } from '../services/CoursesInstructor.service';
 import {
@@ -82,21 +82,33 @@ export class CoursesInstructorController {
     }
 
     /**
-     * สร้างคอร์สใหม่
-     * Create a new course (status will be DRAFT by default)
+     * สร้างคอร์สใหม่ (พร้อมอัปโหลดรูป thumbnail)
+     * Create a new course with optional thumbnail upload (status will be DRAFT by default)
+     * @param data - JSON string containing course data
+     * @param thumbnail - Optional thumbnail image file
      */
     @Post('')
     @Security('jwt', ['instructor'])
     @SuccessResponse('201', 'Course created successfully')
     @Response('400', 'Validation error')
     @Response('500', 'Internal server error')
-    public async createCourse(@Body() body: createCourses, @Request() request: any): Promise<createCourseResponse> {
+    public async createCourse(
+        @Request() request: any,
+        @FormField() data: string,
+        @UploadedFile() thumbnail?: Express.Multer.File
+    ): Promise<createCourseResponse> {
         const token = request.headers.authorization?.replace('Bearer ', '');
+        if (!token) throw new ValidationError('No token provided');
+
         const decoded = jwt.verify(token, config.jwt.secret) as { id: number };
-        const { error, value } = CreateCourseValidator.validate(body.data);
+        const parsed = JSON.parse(data);
+        const { error, value } = CreateCourseValidator.validate(parsed);
         if (error) throw new ValidationError(error.details[0].message);
-        const course = await CoursesInstructorService.createCourse(value, decoded.id);
-        return course;
+
+        // Validate thumbnail file type if provided
+        if (thumbnail && !thumbnail.mimetype?.startsWith('image/')) throw new ValidationError('Only image files are allowed for thumbnail');
+
+        return await CoursesInstructorService.createCourse(value, decoded.id, thumbnail);
     }
 
     /**
@@ -111,9 +123,7 @@ export class CoursesInstructorController {
     @Response('404', 'Course not found')
     public async deleteCourse(@Request() request: any, @Path() courseId: number): Promise<DeleteMyCourseResponse> {
         const token = request.headers.authorization?.replace('Bearer ', '');
-        if (!token) {
-            throw new ValidationError('No token provided');
-        }
+        if (!token) throw new ValidationError('No token provided')
         return await CoursesInstructorService.deleteCourse(token, courseId);
     }
 
@@ -129,9 +139,7 @@ export class CoursesInstructorController {
     @Response('404', 'Course not found')
     public async submitCourse(@Request() request: any, @Path() courseId: number): Promise<submitCourseResponse> {
         const token = request.headers.authorization?.replace('Bearer ', '');
-        if (!token) {
-            throw new ValidationError('No token provided');
-        }
+        if (!token) throw new ValidationError('No token provided')
         return await CoursesInstructorService.sendCourseForReview({ token, course_id: courseId });
     }
 
@@ -148,9 +156,7 @@ export class CoursesInstructorController {
     @Response('404', 'Course not found')
     public async getCourseApprovals(@Request() request: any, @Path() courseId: number): Promise<GetCourseApprovalsResponse> {
         const token = request.headers.authorization?.replace('Bearer ', '');
-        if (!token) {
-            throw new ValidationError('No token provided');
-        }
+        if (!token) throw new ValidationError('No token provided')
         return await CoursesInstructorService.getCourseApprovals(token, courseId);
     }
 
@@ -166,9 +172,7 @@ export class CoursesInstructorController {
     @Response('404', 'Instructors not found')
     public async listInstructorCourses(@Request() request: any, @Path() courseId: number): Promise<listinstructorCourseResponse> {
         const token = request.headers.authorization?.replace('Bearer ', '');
-        if (!token) {
-            throw new ValidationError('No token provided');
-        }
+        if (!token) throw new ValidationError('No token provided')
         return await CoursesInstructorService.listInstructorsOfCourse({ token, course_id: courseId });
     }
 
@@ -185,9 +189,7 @@ export class CoursesInstructorController {
     @Response('404', 'Instructor not found')
     public async addInstructor(@Request() request: any, @Path() courseId: number, @Path() userId: number): Promise<addinstructorCourseResponse> {
         const token = request.headers.authorization?.replace('Bearer ', '');
-        if (!token) {
-            throw new ValidationError('No token provided');
-        }
+        if (!token) throw new ValidationError('No token provided')
         return await CoursesInstructorService.addInstructorToCourse({ token, course_id: courseId, user_id: userId });
     }
 
@@ -204,9 +206,7 @@ export class CoursesInstructorController {
     @Response('404', 'Instructor not found')
     public async removeInstructor(@Request() request: any, @Path() courseId: number, @Path() userId: number): Promise<removeinstructorCourseResponse> {
         const token = request.headers.authorization?.replace('Bearer ', '');
-        if (!token) {
-            throw new ValidationError('No token provided');
-        }
+        if (!token) throw new ValidationError('No token provided')
         return await CoursesInstructorService.removeInstructorFromCourse({ token, course_id: courseId, user_id: userId });
     }
 
@@ -223,9 +223,7 @@ export class CoursesInstructorController {
     @Response('404', 'Primary instructor not found')
     public async setPrimaryInstructor(@Request() request: any, @Path() courseId: number, @Path() userId: number): Promise<setprimaryCourseInstructorResponse> {
         const token = request.headers.authorization?.replace('Bearer ', '');
-        if (!token) {
-            throw new ValidationError('No token provided');
-        }
+        if (!token) throw new ValidationError('No token provided')
         return await CoursesInstructorService.setPrimaryInstructor({ token, course_id: courseId, user_id: userId });
     }
 }