gochro is a small docker image with chromium installed and a golang based webserver to interact with it. It can be used to take screenshots of websites using chromium-headless and convert HTML pages to PDF.
If errors occur the error will be logged to stdout and a non information leaking error message is presented to the user.
This project was used on https://wpscan.io for taking website screenshots and to generate PDF reports.
This URL takes a Screenshot of https://firefart.at with a resolution of 1024x768 and returns an image.
http://localhost:8080/screenshot?url=https://firefart.at&w=1024&h=768
Send a POST request with the HTML you want to convert in the Post body to the following url.
http://localhost:8080/html2pdf?w=1024&h=768
This will return a PDF of the HTML input.
Example:
POST /html2pdf?w=1024&h=768 HTTP/1.1
Host: localhost:8000
Content-Type: application/x-www-form-urlencoded
Content-Length: 119
<html>
<head><title>Test Page</title></head>
<body>
<h1>This is a test</h1>
<p>This is a test</p>
</body>
</html>
Example as curl:
curl -s -k -X 'POST' -o test.pdf --data-binary '<html><body><h1>test</h1></body></html>' 'http://127.0.0.1:8000/html2pdf'
Send a GET request to the following url to get the response as PDF.
http://localhost:8080/url2pdf?url=https://firefart.at&w=1024&h=768
To run this image you should use the seccomp profile provided by Jess Frazelle. The privileges on the host are needed for chromiums internal security sandbox. You can also deactivate the sandbox on chromium (would require changes in main.go) but that's a bad idea and puts your server at risk, so please use the seccomp profile instead.
Be sure to use the --init switch to get rid of zombie processes of chromium.
-host The host and port to listen of (refers to inside the container). Defaults to 0.0.0.0:8000
-debug Enables debug output. Default: false
-ignore-cert-errors Also fetch ressources from origins with untrusted certificates or cert errors.
-proxy Use a proxy server to connect to the internet. Please use format IP:PORT without a protocol. Example: 1.2.3.4:3128
You can also use the prebuit image from dockerhub.
To pull the image run
docker pull firefart/gochroIf you want to include this image in a docker-compose file you can use the following example. Just connect the gochronet to the other service so the containers can communicate with each other.
Please note that the 0.0.0.0 in the command only applies to the network inside the docker container itself. If you want to access it from your local machine you need to add a port mapping.
version: '3.7'
services:
gochro:
image: firefart/gochro
init: true
container_name: gochro
security_opt:
- seccomp="chrome.json"
command: -host 0.0.0.0:8000
networks:
- gochronet
networks:
gochronet:
driver: bridge
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