meteyou/docker-pdf-watermarker

Creates http service node js and pdftk to watermark one PDF over another on each page

Docker HTTP Node PDF Watermarker

This image is service used to stamp one PDF as a watermark on each page of another and to return the resulting PDF using pdftk.

Build and Deploy

docker build -t docker-pdf-watermarker .

docker run -d \
    --name pdf-watermarker \
    --restart=always \
    -p 0.0.0.0:9021:9021 \
    -e "port=9021" \
    docker.io/library/docker-pdf-watermarker

Docker-compose

services:
  pdf-watermarker:
  restart: always
  image: docker.io/library/docker-pdf-watermarker
  ports:
    - "9021:9021"

Connecting to the container from the host

docker exec -it pdf-watermarker /bin/bash -c "export TERM=xterm; exec bash"

Installing additional commands to debug with apt-get

If you wanted to install nano or telnet from there for debugging

apt-get install telnet
apt-get install nano

Using The HTML To PDF Service

To convert HTML to PDF you simply pass mutlipart encoded form data to the service.

The system is looking for a key called html and then one file for each corresponding referenced file. e.g. would require a file named logo.png to be uploaded along with the request

E.g. Any src or href that does not start with @FILE: will cause the service to exit for security purposes.

Example call from CURL in Bash

This assumes that the docker image was deployed to localhost on port 9021 and that you are in the test directory of this project where there are two files: one named watermark.pdf and another named my.pdf.

cd test
curl -F "watermark=@watermark.pdf" -F "pdf-to-watermark=@pdf-to-watermark.pdf" http://localhost:9021/watermark > watermarked.pdf

Example call from CURL in PHP

This assumes that the docker image was deployed to localhost on port 9020 and that you are in the test directory of this project where there are two files: one named logo.png and another named styles.css. You can simply run the example.php file in the test directory of this project or use the code below.

<?php
  $ch = curl_init("http://localhost:9021/watermark");
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_POSTFIELDS, [
      'watermark' =>  new \CurlFile(__DIR__.'/watermark.pdf','application/pdf','watermark.pdf'),
      'pdf-to-watermark' =>  new \CurlFile(__DIR__.'/pdf-to-watermark.pdf','application/pdf','my.pdf')
  ]);
  $result = curl_exec($ch);
  file_put_contents("watermarked.pdf", $result);

Build and Deploy

If you wanted to build and test this yourself

docker build --rm -t paulvisco/docker-node-pdf-watermarker .

docker run -d \
    --name pdf-watermarker \
    --restart=always \
    -p 9021:9021 \
    paulvisco/docker-node-pdf-watermarker