Firebase的云函数-将PDF转换为图像

npm install -g firebase-tools
firebase login
firebase init functions

cd functions
npm install puppeteer pdf-lib sharp

const functions = require('firebase-functions');
const puppeteer = require('puppeteer');
const sharp = require('sharp');
const fs = require('fs');
const path = require('path');

exports.pdfToImage = functions.storage.bucket().object().onFinalize(async (object) => {
  const bucketName = object.bucket;
  const filePath = object.name;
  const fileName = path.basename(filePath, path.extname(filePath));
  const outputDir = path.join(__dirname, 'output');

  if (!fs.existsSync(outputDir)) {
    fs.mkdirSync(outputDir);
  }

  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.goto(`https://${bucketName}.storage.googleapis.com/${filePath}`, { waitUntil: 'networkidle2' });
  const pdfBuffer = await page.pdf({ format: 'A4' });

  const imageBuffers = [];
  for (let i = 0; i < pdfBuffer.numPages; i++) {
    const pageImage = await sharp(pdfBuffer.pages[i].toBuffer()).jpeg().toBuffer();
    imageBuffers.push(pageImage);
  }

  for (let i = 0; i < imageBuffers.length; i++) {
    const imagePath = path.join(outputDir, `${fileName}_${i + 1}.jpg`);
    fs.writeFileSync(imagePath, imageBuffers[i]);
  }

  await browser.close();
  return null;
});

firebase deploy --only functions