112 lines
3.4 KiB
JavaScript
112 lines
3.4 KiB
JavaScript
import fs from 'fs';
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import path from 'path';
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import { fileURLToPath } from 'url';
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const __dirname = path.dirname(fileURLToPath(import.meta.url));
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/**
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* 미리보기 이미지 저장 디렉터리
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* @returns {string}
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*/
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export function getPreviewsDir() {
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const dir = process.env.PREVIEWS_PATH || path.join(__dirname, '..', '..', 'data', 'previews');
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if (!fs.existsSync(dir)) {
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fs.mkdirSync(dir, { recursive: true });
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}
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return dir;
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}
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/**
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* base64 data URL을 PNG 파일로 저장
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* @param {string} shareCode
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* @param {string} dataUrl
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* @returns {string} 파일명
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*/
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export function savePreviewImage(shareCode, dataUrl) {
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if (!dataUrl || !dataUrl.startsWith('data:image')) {
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return null;
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}
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const base64 = dataUrl.replace(/^data:image\/\w+;base64,/, '');
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const fileName = `${shareCode}.png`;
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fs.writeFileSync(path.join(getPreviewsDir(), fileName), Buffer.from(base64, 'base64'));
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return fileName;
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}
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/**
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* @param {string} shareCode
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* @returns {string|null}
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*/
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export function getPreviewFilePath(shareCode) {
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const filePath = path.join(getPreviewsDir(), `${shareCode}.png`);
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return fs.existsSync(filePath) ? filePath : null;
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}
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/**
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* @param {string} shareCode
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* @param {string|null} [previewImageRecord] DB preview_image 컬럼
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* @returns {string|null}
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*/
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export function getPreviewUrl(shareCode, previewImageRecord = null) {
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const hasFile = Boolean(getPreviewFilePath(shareCode));
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if (hasFile || previewImageRecord) {
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return `/api/v1/decks/${shareCode}/preview`;
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}
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return null;
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}
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/**
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* 공유 코드에 연결된 미리보기 파일 삭제
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* @param {string} shareCode
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* @returns {boolean}
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*/
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export function deletePreviewImage(shareCode) {
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const filePath = path.join(getPreviewsDir(), `${shareCode}.png`);
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if (!fs.existsSync(filePath)) return false;
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try {
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fs.unlinkSync(filePath);
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return true;
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} catch (err) {
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console.warn(`[preview] 삭제 실패: ${filePath}`, err);
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return false;
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}
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}
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/**
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* DB에서 참조하지 않는 미리보기 파일 목록
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* @param {Iterable<string>} referencedShareCodes
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* @returns {Array<{fileName: string, size: number, modifiedAt: string}>}
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*/
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export function listOrphanPreviewImages(referencedShareCodes) {
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const referenced = new Set([...referencedShareCodes].map((code) => `${code}.png`));
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return fs
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.readdirSync(getPreviewsDir(), { withFileTypes: true })
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.filter((entry) => entry.isFile() && entry.name.toLowerCase().endsWith('.png'))
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.filter((entry) => !referenced.has(entry.name))
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.map((entry) => {
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const stat = fs.statSync(path.join(getPreviewsDir(), entry.name));
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return {
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fileName: entry.name,
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size: stat.size,
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modifiedAt: stat.mtime.toISOString(),
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};
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})
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.sort((a, b) => b.modifiedAt.localeCompare(a.modifiedAt));
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}
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/**
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* 미참조 미리보기 파일 일괄 삭제
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* @param {Iterable<string>} referencedShareCodes
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* @returns {{deletedCount: number, deletedBytes: number}}
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*/
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export function deleteOrphanPreviewImages(referencedShareCodes) {
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const orphans = listOrphanPreviewImages(referencedShareCodes);
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let deletedBytes = 0;
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orphans.forEach((file) => {
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fs.unlinkSync(path.join(getPreviewsDir(), file.fileName));
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deletedBytes += file.size;
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});
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return { deletedCount: orphans.length, deletedBytes };
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}
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