EventMachine-driven Sinatra app to manipulate images given by url via evented-magick (image-magick).

# resize
/magick?url=http://github.com/images/modules/header/logov3.png&size=200x100

# resize to 200 width / unlimited height
/magick?url=http://github.com/images/modules/header/logov3.png&size=200x

Startup

sudo gem install bundler
bundle install
thin start
curl localhost:3000/...see above...

As Middleware

TODO

Security

If the file config/secret (e.g. including 'my secret') exists, only requests with params hashed with this secret will be accepted.

require 'digest/md5'

def magick_query(params)
  hash = Digest::MD5.hexdigest('my secret' + params.map(&:to_s).sort.to_s)
  params = params.merge(:hash => hash)
  params.map{|k,v| "#{k}=#{v}"}.join('&')
end

`curl http://localhost/magick?#{magick_query(:url=>'xxx', :size=>'100x200')}`

Performance

Everything is evented, so its parallel and fast.
Add caching server infront of the app, e.g. Varnish or Rack::Cache to mak it production-ready.

TODO

• add cropping

Author

Michael Grosser grosser.michael@gmail.com Hereby placed under public domain, do what you want, just do not hold me accountable...