feat: 관리자 비밀번호 변경 API 구현 (#40)

Reviewed-on: https://git.ipstein.myds.me/SPMS/SPMS_API/pulls/41

SPMS.API/Controllers/AuthController.cs

@@ -63,4 +63,24 @@ public class AuthController : ControllerBase
         await _authService.LogoutAsync(adminId);
         return Ok(ApiResponse.Success());
     }
+
+    [HttpPost("password/change")]
+    [Authorize]
+    [SwaggerOperation(
+        Summary = "비밀번호 변경",
+        Description = "현재 로그인된 관리자의 비밀번호를 변경합니다.")]
+    [SwaggerResponse(200, "비밀번호 변경 성공")]
+    [SwaggerResponse(400, "현재 비밀번호 불일치")]
+    [SwaggerResponse(401, "인증되지 않은 요청")]
+    public async Task<IActionResult> ChangePasswordAsync([FromBody] ChangePasswordRequestDto request)
+    {
+        var adminIdClaim = User.FindFirst("adminId")?.Value;
+        if (string.IsNullOrEmpty(adminIdClaim) || !long.TryParse(adminIdClaim, out var adminId))
+        {
+            return Unauthorized(ApiResponse<object>.Fail("101", "인증 정보가 유효하지 않습니다."));
+        }
+
+        await _authService.ChangePasswordAsync(adminId, request);
+        return Ok(ApiResponse.Success());
+    }
 }

SPMS.Application/DTOs/Auth/ChangePasswordRequestDto.cs

@@ -0,0 +1,13 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace SPMS.Application.DTOs.Auth;
+
+public class ChangePasswordRequestDto
+{
+    [Required(ErrorMessage = "현재 비밀번호를 입력해주세요.")]
+    public string CurrentPassword { get; set; } = string.Empty;
+
+    [Required(ErrorMessage = "새 비밀번호를 입력해주세요.")]
+    [MinLength(8, ErrorMessage = "비밀번호는 8자 이상이어야 합니다.")]
+    public string NewPassword { get; set; } = string.Empty;
+}

SPMS.Application/Interfaces/IAuthService.cs

@@ -7,4 +7,5 @@ public interface IAuthService
     Task<LoginResponseDto> LoginAsync(LoginRequestDto request);
     Task<TokenRefreshResponseDto> RefreshTokenAsync(TokenRefreshRequestDto request);
     Task LogoutAsync(long adminId);
+    Task ChangePasswordAsync(long adminId, ChangePasswordRequestDto request);
 }

SPMS.Application/Services/AuthService.cs

@@ -146,4 +146,31 @@ public class AuthService : IAuthService
         _adminRepository.Update(admin);
         await _unitOfWork.SaveChangesAsync();
     }
+
+    public async Task ChangePasswordAsync(long adminId, ChangePasswordRequestDto request)
+    {
+        // 1. 관리자 조회
+        var admin = await _adminRepository.GetByIdAsync(adminId);
+        if (admin is null)
+        {
+            throw new SpmsException(
+                ErrorCodes.NotFound,
+                "관리자를 찾을 수 없습니다.",
+                404);
+        }
+
+        // 2. 현재 비밀번호 검증
+        if (!BCrypt.Net.BCrypt.Verify(request.CurrentPassword, admin.Password))
+        {
+            throw new SpmsException(
+                ErrorCodes.PasswordValidationFailed,
+                "현재 비밀번호가 일치하지 않습니다.",
+                400);
+        }
+
+        // 3. 새 비밀번호 해싱 및 저장
+        admin.Password = BCrypt.Net.BCrypt.HashPassword(request.NewPassword);
+        _adminRepository.Update(admin);
+        await _unitOfWork.SaveChangesAsync();
+    }
 }