feat: CustomAuthenticationFilter 구현

- 로그인 요청 시 호출되는 필터
- authenticationManager.authenticate()를 통해 내부적으로 인증 진행
- 인증 성공, 실패 처리 메소드 구현

Author: ysw789

src/main/java/dmu/dasom/api/global/auth/filter/CustomAuthenticationFilter.java

@@ -0,0 +1,67 @@
+package dmu.dasom.api.global.auth.filter;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import dmu.dasom.api.domain.common.exception.ErrorCode;
+import dmu.dasom.api.domain.common.exception.ErrorResponse;
+import dmu.dasom.api.global.auth.dto.LoginRequestDto;
+import dmu.dasom.api.global.auth.dto.TokenBox;
+import dmu.dasom.api.global.auth.jwt.JwtUtil;
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.authentication.InternalAuthenticationServiceException;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.AuthenticationException;
+import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
+
+import java.io.IOException;
+
+@RequiredArgsConstructor
+public class CustomAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
+
+    private final AuthenticationManager authenticationManager;
+    private final JwtUtil jwtUtil;
+
+    @Override
+    public Authentication attemptAuthentication(final HttpServletRequest request, final HttpServletResponse response) throws AuthenticationException {
+        try {
+            final ObjectMapper objectMapper = new ObjectMapper();
+
+            // 로그인 요청 정보를 파싱
+            final LoginRequestDto loginRequestDto = objectMapper.readValue(request.getInputStream(), LoginRequestDto.class);
+
+            // 로그인 요청 정보로 인증 시도
+            return authenticationManager.authenticate(new UsernamePasswordAuthenticationToken(loginRequestDto.getEmail(), loginRequestDto.getPassword()));
+        } catch (InternalAuthenticationServiceException | IOException e) { // 인증 과정에서 내부 오류 발생 시 (ex. 사용자 정보 없음)
+            throw new AuthenticationException("Authentication Failed.", e) {};
+        }
+    }
+
+    @Override
+    protected void successfulAuthentication(final HttpServletRequest request, final HttpServletResponse response, final FilterChain chain, final Authentication authResult) {
+        // 기존 토큰 만료 처리
+        jwtUtil.blacklistTokens(authResult.getName());
+
+        // 토큰 생성
+        final TokenBox tokenBox = jwtUtil.generateTokenBox(authResult.getName());
+
+        response.setStatus(HttpStatus.OK.value());
+        response.setHeader("Access-Token", tokenBox.getAccessToken());
+        response.setHeader("Refresh-Token", tokenBox.getRefreshToken());
+    }
+
+    @Override
+    protected void unsuccessfulAuthentication(final HttpServletRequest request, final HttpServletResponse response, final AuthenticationException failed) throws IOException {
+        // 로그인 실패 응답
+        response.setStatus(HttpStatus.BAD_REQUEST.value());
+        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
+        response.setCharacterEncoding("UTF-8");
+        response.getWriter().write(new ObjectMapper().writeValueAsString(new ErrorResponse(ErrorCode.LOGIN_FAILED)));
+    }
+
+}