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Fork goose with custom MCP widgets, platform extensions (aider, git, web, search), MindSpace H5 backend/frontend, Plaza/Ops UIs, and deploy scripts for tkmind.cn. Co-authored-by: Cursor <cursoragent@cursor.com>
255 lines
8.7 KiB
JavaScript
255 lines
8.7 KiB
JavaScript
import zlib from 'node:zlib';
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const PREVIEWABLE_MIME_TYPES = new Set([
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'text/html',
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'text/plain',
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'text/markdown',
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'text/csv',
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'application/pdf',
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'image/png',
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'image/jpeg',
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'image/webp',
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'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
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]);
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const PREVIEW_SHELL_STYLE = `
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html,body{margin:0;padding:0;background:#f5f0e5;color:#1f2937;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
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body{padding:24px;box-sizing:border-box;line-height:1.6}
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pre,code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
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pre{white-space:pre-wrap;word-break:break-word;background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:16px}
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table{border-collapse:collapse;width:100%;background:#fff;border-radius:12px;overflow:hidden}
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th,td{border:1px solid #e5e7eb;padding:8px 10px;text-align:left;font-size:14px}
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th{background:#faf7ef}
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.docx-preview h1{font-size:1.5rem;margin:0 0 16px}
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.docx-preview p{margin:0 0 12px;text-indent:2em}
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.docx-preview .meta{color:#6b7280;font-size:13px;margin-bottom:20px;text-indent:0}
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.pdf-frame,.image-frame{display:block;width:100%;min-height:calc(100vh - 48px);border:0;border-radius:12px;background:#fff}
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.image-frame{object-fit:contain;max-height:calc(100vh - 48px);width:auto;max-width:100%;margin:0 auto}
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`;
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function escapeHtml(text) {
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return String(text ?? '')
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.replace(/&/g, '&')
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.replace(/</g, '<')
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.replace(/>/g, '>')
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.replace(/"/g, '"');
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}
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function previewDocument(title, bodyHtml, { downloadUrl = null, extraHead = '' } = {}) {
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const csp = [
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"default-src 'none'",
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"style-src 'unsafe-inline'",
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"img-src 'self' data: https:",
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"font-src 'self' data:",
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"frame-src 'self'",
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"object-src 'self'",
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"base-uri 'none'",
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"form-action 'none'",
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"script-src 'none'",
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].join('; ');
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const downloadLink = downloadUrl
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? `<p class="meta"><a href="${escapeHtml(downloadUrl)}" target="_blank" rel="noopener noreferrer">下载原文件</a></p>`
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: '';
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return `<!doctype html><html lang="zh-CN"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><meta http-equiv="Content-Security-Policy" content="${csp}"><title>${escapeHtml(title)}</title><style>${PREVIEW_SHELL_STYLE}</style>${extraHead}</head><body><h1>${escapeHtml(title)}</h1>${downloadLink}${bodyHtml}</body></html>`;
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}
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function renderInlineMarkdown(text) {
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let html = escapeHtml(text);
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html = html.replace(/`([^`]+)`/g, '<code>$1</code>');
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html = html.replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>');
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html = html.replace(/\*(.+?)\*/g, '<em>$1</em>');
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html = html.replace(/\[([^\]]+)]\(([^)]+)\)/g, '<a href="$2" target="_blank" rel="noopener noreferrer">$1</a>');
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return html;
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}
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function renderMarkdownDocument(text) {
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const lines = String(text ?? '').split('\n');
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const blocks = [];
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let inCode = false;
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let code = [];
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for (const line of lines) {
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if (line.startsWith('```')) {
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if (inCode) {
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blocks.push(`<pre><code>${escapeHtml(code.join('\n'))}</code></pre>`);
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code = [];
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inCode = false;
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} else {
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inCode = true;
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}
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continue;
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}
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if (inCode) {
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code.push(line);
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continue;
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}
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if (!line.trim()) continue;
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const heading = line.match(/^(#{1,6})\s+(.+)$/);
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if (heading) {
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const level = heading[1].length;
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blocks.push(`<h${level}>${renderInlineMarkdown(heading[2])}</h${level}>`);
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continue;
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}
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blocks.push(`<p>${renderInlineMarkdown(line)}</p>`);
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}
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if (inCode && code.length) {
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blocks.push(`<pre><code>${escapeHtml(code.join('\n'))}</code></pre>`);
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}
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return blocks.join('\n');
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}
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function parseCsvRows(text) {
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const rows = [];
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let row = [];
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let cell = '';
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let inQuotes = false;
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for (let i = 0; i < text.length; i += 1) {
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const ch = text[i];
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const next = text[i + 1];
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if (inQuotes) {
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if (ch === '"' && next === '"') {
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cell += '"';
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i += 1;
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} else if (ch === '"') {
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inQuotes = false;
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} else {
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cell += ch;
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}
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continue;
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}
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if (ch === '"') {
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inQuotes = true;
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continue;
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}
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if (ch === ',') {
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row.push(cell);
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cell = '';
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continue;
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}
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if (ch === '\n') {
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row.push(cell);
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rows.push(row);
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row = [];
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cell = '';
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continue;
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}
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if (ch === '\r') continue;
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cell += ch;
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}
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row.push(cell);
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rows.push(row);
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return rows.filter((item) => item.some((value) => String(value ?? '').trim()));
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}
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function renderCsvPreview(text) {
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const rows = parseCsvRows(String(text ?? ''));
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if (rows.length === 0) return '<pre>（空文件）</pre>';
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const [head, ...body] = rows;
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const header = `<thead><tr>${head.map((cell) => `<th>${escapeHtml(cell)}</th>`).join('')}</tr></thead>`;
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const content = body
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.slice(0, 200)
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.map((line) => `<tr>${line.map((cell) => `<td>${escapeHtml(cell)}</td>`).join('')}</tr>`)
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.join('');
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const tail = body.length > 200 ? `<p class="meta">仅展示前 200 行</p>` : '';
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return `<div style="overflow:auto">${tail}<table>${header}<tbody>${content}</tbody></table></div>`;
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}
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function extractZipEntry(buffer, targetName) {
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let offset = 0;
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while (offset + 30 <= buffer.length) {
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if (buffer.subarray(offset, offset + 2).toString('ascii') !== 'PK') break;
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const compressionMethod = buffer.readUInt16LE(offset + 8);
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const compressedSize = buffer.readUInt32LE(offset + 18);
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const nameLength = buffer.readUInt16LE(offset + 26);
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const extraLength = buffer.readUInt16LE(offset + 28);
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const name = buffer.subarray(offset + 30, offset + 30 + nameLength).toString('utf8');
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const dataStart = offset + 30 + nameLength + extraLength;
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if (name === targetName) {
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const compressed = buffer.subarray(dataStart, dataStart + compressedSize);
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if (compressionMethod === 0) return compressed;
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if (compressionMethod === 8) return zlib.inflateRawSync(compressed);
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return null;
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}
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offset = dataStart + compressedSize;
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}
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return null;
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}
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function extractDocxText(buffer) {
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const xmlBuffer = extractZipEntry(buffer, 'word/document.xml');
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if (!xmlBuffer) return '';
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const xml = xmlBuffer.toString('utf8');
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const paragraphs = [];
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for (const block of xml.split('</w:p>')) {
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const texts = [...block.matchAll(/<w:t[^>]*>([\s\S]*?)<\/w:t>/g)].map((match) =>
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match[1]
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.replace(/</g, '<')
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.replace(/>/g, '>')
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.replace(/&/g, '&')
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.replace(/"/g, '"'),
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);
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const line = texts.join('');
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if (line.trim()) paragraphs.push(line.trim());
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}
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return paragraphs.join('\n\n');
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}
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export function canPreviewAsset(mimeType) {
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return PREVIEWABLE_MIME_TYPES.has(mimeType);
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}
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export function renderAssetPreviewHtml({ asset, buffer, downloadUrl }) {
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const title = asset.displayName || asset.filename;
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const mimeType = asset.mimeType;
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if (mimeType === 'text/html') {
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const csp =
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'<meta http-equiv="Content-Security-Policy" content="default-src \'none\'; style-src \'unsafe-inline\' \'self\'; img-src data: https:; font-src \'self\' data:; base-uri \'none\'; form-action \'none\'; script-src \'none\'">';
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const html = buffer.toString('utf8');
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if (/<head[^>]*>/i.test(html)) {
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return html.replace(/<head([^>]*)>/i, `<head$1>${csp}`);
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}
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return `<!doctype html><html lang="zh-CN"><head>${csp}</head><body>${html}</body></html>`;
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}
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if (mimeType === 'application/pdf') {
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return previewDocument(
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title,
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`<iframe class="pdf-frame" src="${escapeHtml(downloadUrl)}" title="${escapeHtml(title)}"></iframe>`,
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{ downloadUrl },
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);
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}
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if (mimeType.startsWith('image/')) {
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return previewDocument(
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title,
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`<img class="image-frame" src="${escapeHtml(downloadUrl)}" alt="${escapeHtml(title)}">`,
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{ downloadUrl },
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);
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}
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if (mimeType === 'text/csv') {
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return previewDocument(title, renderCsvPreview(buffer.toString('utf8')), { downloadUrl });
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}
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if (mimeType === 'text/markdown') {
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return previewDocument(title, renderMarkdownDocument(buffer.toString('utf8')), { downloadUrl });
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}
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if (mimeType === 'text/plain') {
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return previewDocument(title, `<pre>${escapeHtml(buffer.toString('utf8'))}</pre>`, { downloadUrl });
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}
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if (mimeType === 'application/vnd.openxmlformats-officedocument.wordprocessingml.document') {
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const text = extractDocxText(buffer);
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const body = text
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? `<article class="docx-preview">${text
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.split(/\n{2,}/)
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.map((paragraph) => `<p>${escapeHtml(paragraph)}</p>`)
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.join('')}</article>`
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: '<p class="meta">无法提取正文，请下载原文件查看。</p>';
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return previewDocument(title, body, { downloadUrl });
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}
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throw Object.assign(new Error('该资产不支持预览'), { code: 'preview_not_supported' });
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}
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