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Prerequisites

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Using our aptGet build extension to add the LibreOffice package

To deploy this task, you’ll need to add LibreOffice to your project configuration, like this:

trigger.config.ts
import { aptGet } from "@trigger.dev/build/extensions/core";
import { defineConfig } from "@trigger.dev/sdk/v3";

export default defineConfig({
  project: "<project ref>",
  // Your other config settings...
  build: {
    extensions: [
      aptGet({
        packages: ["libreoffice"],
      }),
    ],
  },
});

Build extensions allow you to hook into the build system and customize the build process or the resulting bundle and container image (in the case of deploying). You can use pre-built extensions or create your own.

You’ll also need to add @trigger.dev/build to your package.json file under devDependencies if you don’t already have it there.

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Convert a document to PDF using LibreOffice and upload to R2

This task demonstrates how to use LibreOffice to convert a document (.doc or .docx) to PDF and upload the PDF to an R2 storage bucket.

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Key Features

  • Fetches a document from a given URL
  • Converts the document to PDF
  • Uploads the PDF to R2 storage

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Task code

trigger/libreoffice-pdf-convert.ts
import { PutObjectCommand, S3Client } from "@aws-sdk/client-s3";
import { task } from "@trigger.dev/sdk/v3";
import libreoffice from "libreoffice-convert";
import { promisify } from "node:util";
import path from "path";
import fs from "fs";

const convert = promisify(libreoffice.convert);

// Initialize S3 client
const s3Client = new S3Client({
  // How to authenticate to R2: https://developers.cloudflare.com/r2/api/s3/tokens/
  region: "auto",
  endpoint: process.env.R2_ENDPOINT,
  credentials: {
    accessKeyId: process.env.R2_ACCESS_KEY_ID ?? "",
    secretAccessKey: process.env.R2_SECRET_ACCESS_KEY ?? "",
  },
});

export const libreOfficePdfConvert = task({
  id: "libreoffice-pdf-convert",
  run: async (payload: { documentUrl: string }, { ctx }) => {
    // Set LibreOffice path for production environment
    if (ctx.environment.type !== "DEVELOPMENT") {
      process.env.LIBREOFFICE_PATH = "/usr/bin/libreoffice";
    }

    try {
      // Create temporary file paths
      const inputPath = path.join(process.cwd(), `input_${Date.now()}.docx`);
      const outputPath = path.join(process.cwd(), `output_${Date.now()}.pdf`);

      // Download file from URL
      const response = await fetch(payload.documentUrl);
      const buffer = Buffer.from(await response.arrayBuffer());
      fs.writeFileSync(inputPath, buffer);

      const inputFile = fs.readFileSync(inputPath);
      // Convert to PDF using LibreOffice
      const pdfBuffer = await convert(inputFile, ".pdf", undefined);
      fs.writeFileSync(outputPath, pdfBuffer);

      // Upload to R2
      const key = `converted-pdfs/output_${Date.now()}.pdf`;
      await s3Client.send(
        new PutObjectCommand({
          Bucket: process.env.R2_BUCKET,
          Key: key,
          Body: fs.readFileSync(outputPath),
        })
      );

      // Cleanup temporary files
      fs.unlinkSync(inputPath);
      fs.unlinkSync(outputPath);

      return { pdfLocation: key };
    } catch (error) {
      console.error("Error converting PDF:", error);
      throw error;
    }
  },
});

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Testing your task

To test this task, use this payload structure:

{
  "documentUrl": "<a-document-url>" // Replace <a-document-url> with the URL of the document you want to convert
}

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Local development

To test this example task locally, be sure to install any packages from the build extensions you added to your trigger.config.ts file to your local machine. In this case, you need to install .

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