https://factchecker.cloud/src/utils/fileUtils.ts

1export function getFileExtension(filename) {
2	const parts = filename.split(".");
3	if (parts.length < 2) return null;
4	const ext = parts[parts.length - 1]?.toLowerCase();
5	return ext ? `.${ext}` : null;
6}
7/**
8* Blob 을 지정 파일명으로 브라우저 다운로드 트리거.
9*
10* Why: createObjectURL → anchor → append → click → remove → 지연 revoke 의식을
11* 7개 컴포넌트가 각자 복사하고 있었다(수정 시 7곳 동기화 필요). 단일 헬퍼로 통합.
12* - anchor 를 DOM 에 붙이는 이유: Firefox 일부 버전 + Safari 는 document tree 에
13*   없는 anchor 의 click() 이 download 속성을 무시하거나 no-op 이 되는 사례가 있다.
14* - revoke 를 60s 지연하는 이유: 같은 마이크로태스크 내 revoke 는 큰 파일(수십~수백 MB)
15*   에서 download fetch 시작 전에 URL 을 무효화해 0 byte 파일이 받히는 사례가 있다.
16* - window.document 사용: 호출부 컴포넌트에서 `document` 가 prop 으로 섀도잉되는
17*   경우(DocumentDetailModal)와 무관하게 안전.
18*/
19export function downloadBlob(blob, filename) {
20	const url = URL.createObjectURL(blob);
21	const a = window.document.createElement("a");
22	a.href = url;
23	a.download = filename;
24	window.document.body.appendChild(a);
25	a.click();
26	a.remove();
27	setTimeout(() => URL.revokeObjectURL(url), 6e4);
28}
29/**
30* Content-Disposition 헤더에서 파일명 — RFC 5987 `filename*=utf-8''…`(한글) 우선, 없으면 `filename=`.
31* zip 처럼 서버가 이름을 정하는 다운로드가 공유한다.
32*/
33export function filenameFromDisposition(header, fallback) {
34	const cd = String(header ?? "");
35	const star = /filename\*=utf-8''([^;]+)/i.exec(cd);
36	if (star) {
37		try {
38			return decodeURIComponent(star[1]);
39		} catch {}
40	}
41	const plain = /filename="?([^";]+)"?/i.exec(cd);
42	return plain ? plain[1] : fallback;
43}
44
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