link short

short.rb

require 'sinatra'
require 'redis'
require 'json'
require 'securerandom'

get '/l/:token' do
  redis = Redis.new
  token_contents = redis.get(params[:token])
  if token_contents
    redirect token_contents
  else
    redirect 'https://cuetutor.com'
  end
end

post '/l' do
  content_type :json
  req_body = request.body.read
  if JSON.parse(req_body)
    json = JSON.parse(req_body)
    destination = json.fetch('url', 'https://cuetutor.com')
  end
  redis = Redis.new
  token = SecureRandom.hex(3)
  token_link = "l/%s" % token
  redis.set(token.to_s, destination.to_s)
  resp = { short_link: token_link, long_link: destination }
  resp.to_json 
end