인터페이스 설계서 자동생성DTO

dap-gateway/src/main/java/io/shinhanlife/dap/mcg/presentation/DtoDownloadProxyController.java

@@ -0,0 +1,72 @@
+package io.shinhanlife.dap.mcg.presentation;
+
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.http.ContentDisposition;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestClient;
+import org.springframework.web.client.RestClientResponseException;
+
+/**
+ * Gateway 화면에서 들어온 DTO 엑셀 요청을 실제 DTO 클래스가 있는 Tool Pod로 전달한다.
+ * 브라우저가 동일 출처(8081)만 호출하도록 하여 CORS와 배포 주소 차이를 숨긴다.
+ */
+@RestController
+public class DtoDownloadProxyController {
+
+    private static final MediaType XLSX_MEDIA_TYPE = MediaType.parseMediaType(
+            "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
+
+    private final RestClient restClient;
+    private final String toolPodUrl;
+
+    public DtoDownloadProxyController(
+            RestClient.Builder restClientBuilder,
+            @Value("${mcp.gateway.fallback.default-url:http://localhost:8084}") String toolPodUrl) {
+        this.restClient = restClientBuilder.build();
+        this.toolPodUrl = toolPodUrl.replaceAll("/+$", "");
+    }
+
+    @GetMapping("/dto-download/options")
+    public List<String> options() {
+        // 셀렉트박스에 표시할 DTO 이름 목록을 Tool Pod에서 조회한다.
+        List<String> options = restClient.get()
+                .uri(toolPodUrl + "/dto-download/options")
+                .retrieve()
+                .body(new ParameterizedTypeReference<>() {});
+        return options == null ? List.of() : options;
+    }
+
+    @GetMapping("/dto-download/{dtoName}")
+    public ResponseEntity<byte[]> download(@PathVariable String dtoName) {
+        byte[] workbook;
+        try {
+            // 생성된 엑셀 바이트를 그대로 브라우저에 전달한다.
+            workbook = restClient.get()
+                    .uri(toolPodUrl + "/dto-download/{dtoName}", dtoName)
+                    .retrieve()
+                    .body(byte[].class);
+        } catch (RestClientResponseException error) {
+            // 형식 불일치 등의 상태 코드와 오류 메시지도 변경 없이 전달한다.
+            return ResponseEntity.status(error.getStatusCode())
+                    .contentType(error.getResponseHeaders() != null
+                            && error.getResponseHeaders().getContentType() != null
+                            ? error.getResponseHeaders().getContentType() : MediaType.TEXT_PLAIN)
+                    .body(error.getResponseBodyAsByteArray());
+        }
+        String fileName = dtoName + ".xlsx";
+        return ResponseEntity.ok()
+                .contentType(XLSX_MEDIA_TYPE)
+                .contentLength(workbook == null ? 0 : workbook.length)
+                .header(HttpHeaders.CONTENT_DISPOSITION,
+                        ContentDisposition.attachment().filename(fileName).build().toString())
+                .body(workbook == null ? new byte[0] : workbook);
+    }
+}