Example of creating a signed image chart URL for ChartURL.com

signed_url.rb

# This is a working example.
require 'json'
require 'openssl'
require 'base64'
require 'cgi'

ENCRYPT_KEY = "dek-d7a46236eda961a6c3c18ffcc6b077ba87d27e9ae85f7842c6d427c265dd5f69d5131308d93332353d4a55a4b1160fcf516515a4a9f0aa50fbf2d7a2e7d0f1c5"
PROJECT_TOKEN = "dt-RwYN"

def charturl_url(template_slug, options)
  json = options.to_json
  sig = Base64.encode64(OpenSSL::HMAC.digest('sha256', ENCRYPT_KEY, json))
 
  "https://charturl.com/i/#{PROJECT_TOKEN}/#{template_slug}?d=#{CGI.escape json}&s=#{CGI.escape sig}"  
end

# Call our helper
url = charturl_url("weekly-activity",
    {options: {data: {columns: [["This Week", 10,12,41,9,14,15,15], ["Last Week", 9,14,21,21,20,3,5]]}}})