sqlite

src/util/generateDocumentThumb.js

@@ -28,6 +28,40 @@ async function renderPdfPageToPng(pdfBuffer) {
  * @param {Object} [options]
  * @returns {Promise<{thumbavif: Buffer|null, thumbx: number|null, thumby: number|null}>}
  */
+
+function escapeXml(str) {
+  return str.replace(/[&<>'"]/g, (c) => {
+    switch (c) {
+      case '&': return '&amp;';
+      case '<': return '&lt;';
+      case '>': return '&gt;';
+      case "'": return '&apos;';
+      case '"': return '&quot;';
+      default: return c;
+    }
+  });
+}
+
+function renderTextToSvg(text, width = 400, height = 560) {
+  const lines = text.split(/\r?\n/).slice(0, 32);
+  const paddingX = 24;
+  const paddingTop = 32;
+  const lineHeight = 16;
+
+  const textElements = lines
+    .map((line, idx) => {
+      const y = paddingTop + idx * lineHeight;
+      const truncated = line.length > 50 ? line.slice(0, 47) + '...' : line;
+      return `<text x="${paddingX}" y="${y}" font-family="monospace" font-size="11" fill="#334155">${escapeXml(truncated)}</text>`;
+    })
+    .join('\n');
+
+  return Buffer.from(`<svg width="${width}" height="${height}" xmlns="http://www.w3.org/2000/svg">
+    <rect width="100%" height="100%" fill="#ffffff" stroke="#e2e8f0" stroke-width="2"/>
+    ${textElements}
+  </svg>`, 'utf8');
+}
+
 export default async function generateDocumentThumb(content, mimetype, options = {}) {
   if (!Buffer.isBuffer(content) || content.length === 0) {
     return { thumbavif: null, thumbx: null, thumby: null };
@@ -45,6 +79,19 @@ export default async function generateDocumentThumb(content, mimetype, options =
     }
   } else if (type.startsWith('image/')) {
     imageBuffer = content;
+  } else if (
+    type === 'text/plain' ||
+    type === 'text/csv' ||
+    type.startsWith('text/') ||
+    options.filename?.toLowerCase().endsWith('.txt') ||
+    options.filename?.toLowerCase().endsWith('.csv')
+  ) {
+    try {
+      imageBuffer = renderTextToSvg(content.toString('utf8'));
+    } catch (err) {
+      console.warn('generateDocumentThumb: Text render failed:', err.message);
+      return { thumbavif: null, thumbx: null, thumby: null };
+    }
   } else {
     return { thumbavif: null, thumbx: null, thumby: null };
   }