phantom-lambda-fontconfig-pack

Why

Using phantom js on lambda with nodejs 10 and 12 is not directly possible, it becase it misses few dependencies like libfontconfig.so on the newer amazon linux 2 base image. To overcome this problem you have to use your own fonts folder which contains the required files and a font.conf file

More details are contained in the links given below, you can generate your own or clone this pack and use it with your lambda

Usage

1. Clone the pack, and add the fonts folder to your lambda zip.
2. add following environment variables to you lambda

process.env['FONTCONFIG_PATH'] = path.join(process.env['LAMBDA_TASK_ROOT'], 'fonts'); OR process.env['FONTCONFIG_PATH'] = path.join(process.env['LAMBDA_TASK_ROOT'], '...');

AND

process.env['LD_LIBRARY_PATH'] = path.join(process.env['LAMBDA_TASK_ROOT'], 'fonts'); OR process.env['LD_LIBRARY_PATH'] = path.join(process.env['LAMBDA_TASK_ROOT'], '...');

3. if you are using lambda layers, the set the env variables as following

FONTCONFIG_PATH='/opt/fonts' LD_LIBRARY_PATH='/opt/fonts' here the fonts folder is the root directory of you layer

4. Change the font.conf file with following content:

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
  <dir>/var/task/fonts/</dir>
  <cachedir>/tmp/fonts-cache/</cachedir>
  <config></config>
</fontconfig>

5. If using lambda layer, with folder structure for example: nodejs/fonts/font.conf, Change the font.conf as with following content

<fontconfig>
<dir>/opt/nodejs/fonts/</dir>
<cachedir>/tmp/fonts-cache/</cachedir>
<config></config>
</fontconfig>

Adding font files

If you face any more isses, such as PDF getting generated without text, then add .ttf font files to the fonts folder in the lambda/layer zip

1. Go to /usr/share/fonts/#{FONT FOLDER NAME}, copy all the font files from the folder folder
2. if running on docker copy using docker cp <CONTAINER_ID>:/fonts/ .

Links for reference

1. https://medium.com/@anjanava.biswas/nodejs-runtime-environment-with-aws-lambda-layers-f3914613e20e
2. https://stackoverflow.com/a/56843029/3556874
3. https://stackoverflow.com/a/18101158/3556874
4. https://tech.mybuilder.com/compiling-wkhtmltopdf-aws-lambda-with-bref-easier-than-you-think/#comment-4681622370