A silly little URL shortener.

Gemfile

source "https://rubygems.org"

gem "sinatra"

Gemfile.lock

GEM
  remote: https://rubygems.org/
  specs:
    rack (1.5.2)
    rack-protection (1.5.1)
      rack
    sinatra (1.4.4)
      rack (~> 1.4)
      rack-protection (~> 1.4)
      tilt (~> 1.3, >= 1.3.4)
    tilt (1.4.1)

PLATFORMS
  ruby

DEPENDENCIES
  sinatra

shortly.rb

#!/usr/bin/env ruby

require 'bundler/setup'

require 'sinatra'
require 'securerandom'

URLS = {}

get '/:slug' do
  redirect URLS[params[:slug]]
end

post '/' do
  begin
    slug = SecureRandom.hex(4)
  end while URLS.has_key?(slug)

  URLS[slug] = params[:url]

  "#{slug}\n"
end