[BE] 유저 닉네임 변경 API 추가

BE/src/auth/dto/rename-user.dto.ts

@@ -0,0 +1,6 @@
+import { ApiProperty } from '@nestjs/swagger';
+
+export class RenameUserDto {
+  @ApiProperty({ description: '변경할 닉네임' })
+  nickname: string;
+}

BE/src/auth/user.controller.ts

@@ -1,14 +1,16 @@
-import { Controller, Get, Req, UseGuards } from '@nestjs/common';
+import { Body, Controller, Get, Post, Req, UseGuards } from '@nestjs/common';
 import { Request } from 'express';
 import {
   ApiBearerAuth,
+  ApiBody,
   ApiOperation,
   ApiResponse,
   ApiTags,
 } from '@nestjs/swagger';
 import { UserService } from './user.service';
 import { JwtAuthGuard } from './jwt-auth-guard';
 import { ProfileResponseDto } from './dto/profile-response.dto';
+import { RenameUserDto } from './dto/rename-user.dto';
 
 @Controller('/api/user')
 @ApiTags('프로필 API')
@@ -27,4 +29,20 @@ export class UserController {
   getProfile(@Req() request: Request) {
     return this.userService.getProfile(parseInt(request.user.userId, 10));
   }
+
+  @Post('/rename')
+  @UseGuards(JwtAuthGuard)
+  @ApiOperation({
+    summary: '유저 닉네임 변경 API',
+  })
+  @ApiBody({
+    type: RenameUserDto,
+  })
+  @ApiBearerAuth()
+  renameUser(@Req() request: Request, @Body() body: RenameUserDto) {
+    const userId = parseInt(request.user.userId, 10);
+    const newName = body.nickname;
+
+    return this.userService.renameUser(userId, newName);
+  }
 }

BE/src/auth/user.service.ts

@@ -1,4 +1,8 @@
-import { Injectable } from '@nestjs/common';
+import {
+  BadRequestException,
+  Injectable,
+  NotFoundException,
+} from '@nestjs/common';
 import { UserRepository } from './user.repository';
 import { ProfileResponseDto } from './dto/profile-response.dto';
 
@@ -10,4 +14,20 @@ export class UserService {
     const user = await this.userRepository.findOneBy({ id: userId });
     return new ProfileResponseDto(user.nickname, user.email);
   }
+
+  async renameUser(userId: number, newName: string) {
+    const user = await this.userRepository.findOneBy({ id: userId });
+    if (!user) {
+      throw new NotFoundException('존재하지 않는 유저입니다.');
+    }
+
+    const isDuplicated = await this.userRepository.findBy({
+      nickname: newName,
+    });
+    if (isDuplicated.length > 0) {
+      throw new BadRequestException('이미 존재하는 닉네임입니다.');
+    }
+
+    return this.userRepository.update({ id: userId }, { nickname: newName });
+  }
 }