[NOISSUE] fix: 누락된 파일 추가

tecobrary-admin/src/main/java/com/woowacourse/tecobrary/admin/handler/AdminAuthSuccessHandler.java

@@ -0,0 +1,26 @@
+package com.woowacourse.tecobrary.admin.handler;
+
+import com.woowacourse.tecobrary.admin.web.AdminUserDto;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.web.authentication.SavedRequestAwareAuthenticationSuccessHandler;
+import org.springframework.stereotype.Component;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class AdminAuthSuccessHandler extends SavedRequestAwareAuthenticationSuccessHandler {
+
+    @Override
+    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws ServletException, IOException {
+        super.onAuthenticationSuccess(request, response, authentication);
+        AdminUserDto adminUserDto = (AdminUserDto) authentication.getPrincipal();
+        log.info("로그인 성공={}", adminUserDto);
+    }
+}