How can I generate a PDF with custom fonts using AWS Lambda? - node.js

Question

I have an AWS Lambda function that generates PDFs using the html-pdf library with custom fonts.
At first, I imported my fonts externally from Google Fonts, but then the PDF's size has enlarged by ten times.
So I tried to import my fonts locally src('file:///var/task/fonts/...ttf/woff2') but still no luck.
Lastly, I trie to create fonts folder in the main project and then I added all of my fonts, plus the file fonts.config:
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<dir>/var/task/fonts/</dir>
<cachedir>/tmp/fonts-cache/</cachedir>
<config></config>
</fontconfig>
and set the following env:
FONTCONFIG_PATH = /var/task/fonts
but still no luck (I haven't installed fontconfig since I'm not sure how and if I need to).
My Runtime env is Node.js 8.1.0.

Answer 1

You can upload your fonts into an S3 bucket and then download them to the lambda's /tmp directory, during its execution. In case your lib creates .pkl files, you should first change your root directory to /tmp (lambda is not allowed to write in the default root directory).
The following Python code downloads your files from a /fonts directory in an S3 bucket to /tmp/fonts "local" directory.
import os
import boto3
os.chdir('/tmp')
os.mkdir(os.path.join('/tmp/', 'fonts'))
s3 = boto3.resource('s3')
s3_client = boto3.client('s3')
my_bucket = s3.Bucket("bucket_name")
for file in my_bucket.objects.filter(Prefix="fonts/"):
filename = file.key
short_filename = filename.replace('fonts/','')
if(len(short_filename) > 0):
s3_client.download_file(
bucket,
filename,
"/tmp/fonts/" + short_filename,
)