Create Snapshot using API in Ruby

create_snapshot.rb

# Ruby 2.4.1

# Require libraries
require 'rest-client'
require 'openssl'

# Setup variables
public_key  = 'public key here'
secret_key  = 'secret key here'
digest      =  OpenSSL::Digest.new('sha256')

# Params for new Snapshot
params = {
  "snapshot[source_url]" => "http://www.example.com",
  "snapshot[name]" => "Example snapshot",
  "snapshot[max_visits]" => 10,
  "snapshot[expires_at]" => 1512368414,
  "api_key" => public_key
}

# Convert Hash into an Array of a String key/value pair
content = params.map do |k, v|
  "#{k}#{v}"
end

# Sort Array and join
content = content.sort.join

# Create a signature
signature = OpenSSL::HMAC.hexdigest(digest, secret_key, content)

# POST request to create Snapshot
response = RestClient.post("https://app.crazyegg.com/api/v2/snapshots.json?signed=#{signature}", params)

# Response from Crazy Egg (200 Status Code)
response.code