aws-lambda-libreoffice

Utility to work with Docker version of LibreOffice in Lambda

Install

$ yarn add @shelf/aws-lambda-libreoffice

Features

Includes CJK and X11 fonts bundled in the base Docker image!
Relies on the latest LibreOffice 7.4 version which is not stripped down from features as a previous layer-based version of this package
Requires node.js 16x runtime (x86_64)

Requirements

Lambda Docker Image

First, you need to create a Docker image for your Lambda function. See the example at libreoffice-lambda-base-image repo.

Example:

FROM public.ecr.aws/shelf/lambda-libreoffice-base:7.4-node16-x86_64

COPY ./ ${LAMBDA_TASK_ROOT}/

RUN yarn install

CMD [ "handler.handler" ]

Lambda Configuration

At least 3008 MB of RAM is recommended
At least 45 seconds of Lambda timeout is necessary
For larger files support, you can extend Lambda's /tmp space using the ephemeral-storage parameter
Set environment variable HOME to /tmp

Usage (For version 4.x; based on a Lambda Docker Image)

Given you have packaged your Lambda function as a Docker image, you can now use this package:

const {convertTo, canBeConvertedToPDF} = require('@shelf/aws-lambda-libreoffice');

module.exports.handler = async () => {
  // assuming there is a document.docx file inside /tmp dir
  // original file will be deleted afterwards

  // it is optional to invoke this function, you can skip it if you're sure about file format
  if (!canBeConvertedToPDF('document.docx')) {
    return false;
  }

  return convertTo('document.docx', 'pdf'); // returns /tmp/document.pdf
};

Usage (For version 3.x; based on a Lambda Layer)

This version requires Node 12.x or higher.

NOTE: Since version 2.0.0 npm package no longer ships the 85 MB LibreOffice but relies upon libreoffice-lambda-layer instead. Follow the instructions on how to add a lambda layer in that repo.

const {convertTo, canBeConvertedToPDF} = require('@shelf/aws-lambda-libreoffice');

module.exports.handler = async () => {
  // assuming there is a document.docx file inside /tmp dir
  // original file will be deleted afterwards

  if (!canBeConvertedToPDF('document.docx')) {
    return false;
  }

  return convertTo('document.docx', 'pdf'); // returns /tmp/document.pdf
};

Or if you want more control:

const {unpack, defaultArgs} = require('@shelf/aws-lambda-libreoffice');

await unpack(); // default path /tmp/instdir/program/soffice.bin

execSync(
  `/tmp/instdir/program/soffice.bin ${defaultArgs.join(
    ' '
  )} --convert-to pdf file.docx --outdir /tmp`
);

Troubleshooting

Please allocate at least 3008 MB of RAM for your Lambda function.
If some file fails to be converted to PDF, try converting it to PDF on your computer first. This might be an issue with LibreOffice itself
- If you want to include some fonts/plugins to the libreoffice, contribute to the libreoffice-lambda-base-image instead

Test

Beside unit tests that could be run via yarn test, there are integration tests.

Smoke test that it works:

cd test
./test.sh

# copy converted PDF file from container to the host to see if it's ok
export CID=$(cat ./cid)
docker cp $CID:/tmp/test.pdf ./test.pdf

Publish

$ git checkout master
$ yarn version
$ yarn publish
$ git push origin master --tags

shelfio/aws-lambda-libreoffice

shelfio

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