Screamshot

A synchronous HTTP screenshot service built on Sinatra and headless Chrome (via Ferrum).

• Usage
• Options
  • URL
  • Window / viewport size
  • Full-screen
  • Scale (devicePixelRatio)
  • prefers-reduced-motion
• Deployment
  • Deploying to Fly.io
  • Deploying to Heroku
• Development

Usage

Trigger a screenshot by making a GET request to /screenshot with a url querystring parameter. The endpoint is protected by basic HTTP authentication with your AUTH_TOKEN.

$ curl "http://[email protected]/screenshot?url=http://example.com" > screenshot.png

Options

Pass options via querystring parameters. A more complicated Screamshot URL might be the following combination of available options:

http://[email protected]/screenshot?url=http://example.com&viewport=800,600&full=true&scale=2&prefers-reduced-motion=reduce

URL

The URL to capture. The only required parameter.

url=http://example.com

Window / viewport size

Control the size of the viewport with WIDTH,HEIGHT. Defaults to 1024,768.

viewport=800,600

Full-screen

Capture the entire page instead of just the viewport. Defaults to false.

full=true

Scale (devicePixelRatio)

This mimics devicePixelRatio and scales the viewport so scale=2 combined with viewport=800,600 results in a 1600×1200 image. Defaults to 1.

scale=2

prefers-reduced-motion

Force the browser into prefers-reduced-motion=reduce mode. This can be used as a standards-based hint to the page not to use animations. Defaults to nothing and so is not enabled.

prefers-reduced-motion=reduce

Deployment

Deploying to Fly.io

Clone this repository and use flyctl to create and configure the app (say yes when asked whether you'd like to copy its configuration):

$ fly launch --name my-app-name

Deploying to Heroku

Development

Start the server with bundle exec puma -C config/puma.rb.

Run the tests with bundle exec rspec.

Write usage docs here, update the homepage with bin/update_docs.

Licence

Copyright © Ben Pickles, MIT licence.