pdf convert wasm only

.gitignore

@@ -1,2 +1,3 @@
 /.env
 /node_modules
+/output

package-lock.json

@@ -13,6 +13,7 @@
         "@hpcc-js/wasm-graphviz": "^1.29.1",
         "chalk": "^6.0.0",
         "dotenv": "^17.4.2",
+        "pdfconvert-wasm": "^0.1.0",
         "sharp": "^0.35.4",
         "thumbhash": "^0.1.1"
       },
@@ -1475,6 +1476,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/pdfconvert-wasm": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/pdfconvert-wasm/-/pdfconvert-wasm-0.1.0.tgz",
+      "integrity": "sha512-Hf2Gy/lgjcygI2as9O/GJXQjsszAqGrPBlkgyMTp2QT3R2PLSxiUfXu6FP5Qi7XfZmyjwWMnj4O1gy7Coh9kzQ==",
+      "license": "GPLv3"
+    },
     "node_modules/process": {
       "version": "0.11.10",
       "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",

package.json

@@ -22,6 +22,7 @@
     "@hpcc-js/wasm-graphviz": "^1.29.1",
     "chalk": "^6.0.0",
     "dotenv": "^17.4.2",
+    "pdfconvert-wasm": "^0.1.0",
     "sharp": "^0.35.4",
     "thumbhash": "^0.1.1"
   },

src/util/generateDocumentThumb.js

@@ -1,48 +1,19 @@
 import sharp from 'sharp';
-import { spawn } from 'node:child_process';
+import { pdfToPng } from 'pdfconvert-wasm';
 
 const THUMB_MAX = 200;
 
 /**
- * Renders page 1 of a PDF into a PNG buffer using pdftocairo.
+ * Renders page 1 of a PDF into a PNG buffer using pdfconvert-wasm.
  * @param {Buffer} pdfBuffer
  * @returns {Promise<Buffer>}
  */
-function renderPdfPageToPng(pdfBuffer) {
-  return new Promise((resolve, reject) => {
-    const proc = spawn('pdftocairo', ['-png', '-singlefile', '-', '-'], {
-      stdio: ['pipe', 'pipe', 'pipe'],
-    });
-
-    const chunks = [];
-    const errChunks = [];
-
-    proc.stdout.on('data', (chunk) => chunks.push(chunk));
-    proc.stderr.on('data', (chunk) => errChunks.push(chunk));
-
-    proc.stdin.on('error', (err) => {
-      console.warn('[pdftocairo] stdin stream error:', err.message);
-    });
-
-    proc.on('error', (err) => {
-      reject(new Error(`Failed to start pdftocairo: ${err.message}`));
-    });
-
-    proc.on('close', (code) => {
-      if (code !== 0) {
-        const stderr = Buffer.concat(errChunks).toString('utf8').trim();
-        reject(new Error(`pdftocairo exited with code ${code}${stderr ? `: ${stderr}` : ''}`));
-      } else {
-        resolve(Buffer.concat(chunks));
+async function renderPdfPageToPng(pdfBuffer) {
+  const images = await pdfToPng(pdfBuffer, { dpi: 150, singleFile: true });
+  if (!images || images.length === 0 || !images[0].data) {
+    throw new Error('pdfconvert-wasm produced no image output');
   }
-    });
-
-    try {
-      proc.stdin.end(pdfBuffer);
-    } catch (writeErr) {
-      console.warn('[pdftocairo] Failed writing to stdin:', writeErr.message);
-    }
-  });
+  return Buffer.from(images[0].data);
 }
 
 /**
@@ -51,9 +22,10 @@ function renderPdfPageToPng(pdfBuffer) {
  *
  * @param {Buffer} content
  * @param {string} mimetype
+ * @param {Object} [options]
  * @returns {Promise<{thumbavif: Buffer|null, thumbx: number|null, thumby: number|null}>}
  */
-export default async function generateDocumentThumb(content, mimetype) {
+export default async function generateDocumentThumb(content, mimetype, options = {}) {
   if (!Buffer.isBuffer(content) || content.length === 0) {
     return { thumbavif: null, thumbx: null, thumby: null };
   }