검증게시판, 압축파일, 한글파일 첨부가능

frontend/src/utils/verificationAttachmentFiles.ts

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+/**
+ * 검증게시판 첨부 — 이미지 + zip·hwp·hwpx
+ */
+import {
+  pickImageFiles,
+  prepareImagesForUpload,
+} from './clipboardImageFiles';
+
+export const VERIFICATION_ATTACHMENT_ACCEPT =
+  'image/jpeg,image/png,image/gif,image/webp,image/bmp,.zip,.hwp,.hwpx,application/zip,application/x-hwp,application/vnd.hancom.hwpx';
+
+const DOCUMENT_EXT = new Set(['.zip', '.hwp', '.hwpx']);
+
+const DOCUMENT_MIME = new Set([
+  'application/zip',
+  'application/x-zip-compressed',
+  'application/x-hwp',
+  'application/haansoft-hwp',
+  'application/vnd.hancom.hwp',
+  'application/hwp+zip',
+  'application/vnd.hancom.hwpx',
+  'application/x-hwpx',
+]);
+
+function extOf(name: string): string {
+  const i = name.lastIndexOf('.');
+  return i >= 0 ? name.slice(i).toLowerCase() : '';
+}
+
+function mimeForDocumentExt(ext: string): string | null {
+  switch (ext) {
+    case '.zip': return 'application/zip';
+    case '.hwp': return 'application/x-hwp';
+    case '.hwpx': return 'application/vnd.hancom.hwpx';
+    default: return null;
+  }
+}
+
+export function isImageAttachment(contentType?: string | null, fileName?: string | null): boolean {
+  const mime = (contentType ?? '').split(';')[0]?.trim().toLowerCase();
+  if (mime.startsWith('image/')) return true;
+  const ext = fileName ? extOf(fileName) : '';
+  return ['.jpg', '.jpeg', '.png', '.gif', '.webp', '.bmp'].includes(ext);
+}
+
+export function isDocumentAttachmentFile(file: File): boolean {
+  const ext = extOf(file.name);
+  if (DOCUMENT_EXT.has(ext)) return true;
+  const mime = file.type.split(';')[0]?.trim().toLowerCase();
+  return DOCUMENT_MIME.has(mime);
+}
+
+function normalizeDocumentFile(file: File): File | null {
+  if (file.size === 0) return null;
+  const ext = extOf(file.name);
+  if (!DOCUMENT_EXT.has(ext)) {
+    const mime = file.type.split(';')[0]?.trim().toLowerCase();
+    if (!DOCUMENT_MIME.has(mime)) return null;
+  }
+  const mime = mimeForDocumentExt(ext)
+    ?? file.type.split(';')[0]?.trim().toLowerCase()
+    ?? 'application/octet-stream';
+  if (file.type === mime) return file;
+  return new File([file], file.name, { type: mime, lastModified: file.lastModified });
+}
+
+/** FileList / File[] → 허용 첨부만 (이미지·zip·hwp·hwpx) */
+export function pickAttachmentFiles(list: FileList | File[]): File[] {
+  const out: File[] = [];
+  for (const file of Array.from(list)) {
+    if (isDocumentAttachmentFile(file)) {
+      const doc = normalizeDocumentFile(file);
+      if (doc) out.push(doc);
+      continue;
+    }
+    const img = pickImageFiles([file])[0];
+    if (img) out.push(img);
+  }
+  return out;
+}
+
+const MAX_BYTES = 5 * 1024 * 1024;
+
+/** 이미지는 압축·문서는 그대로 업로드 */
+export async function prepareAttachmentsForUpload(files: File[]): Promise<File[]> {
+  const picked = pickAttachmentFiles(files);
+  const out: File[] = [];
+  for (const f of picked) {
+    if (isDocumentAttachmentFile(f)) {
+      if (f.size > MAX_BYTES) throw new Error('FILE_TOO_LARGE');
+      out.push(f);
+    } else {
+      out.push(...await prepareImagesForUpload([f]));
+    }
+  }
+  return out;
+}
+
+export const ATTACHMENT_TYPE_HINT =
+  'jpeg, png, gif, webp, bmp, zip, hwp, hwpx (파일당 5MB)';