vuforia_add_target.rb

require 'digest'
require 'openssl'
require 'base64'
require 'net/http'
require 'json'
require 'time'

VWS_ENDPOINT = 'vws.vuforia.com'
TARGETS_PATH = '/targets'

def authorization_header_for_request(access_key, secret_key, method, content, content_type, date, request_path)
  components_to_sign = []
  components_to_sign << method
  components_to_sign << Digest::MD5.hexdigest(content)
  components_to_sign << content_type
  components_to_sign << date
  components_to_sign << request_path
  string_to_sign = components_to_sign.join("\n")
  signature = Base64.strict_encode64(OpenSSL::HMAC.digest('sha1', secret_key, string_to_sign))
  "VWS #{access_key}:#{signature}"
end

def post_new_target(access_key, secret_key, name, image)
  http_method = 'POST'
  content_type = 'application/json'
  image_base_64 = Base64.strict_encode64(File.open(image, "rb").read).to_s
  request_body = {width: 20, name: name, active_flag: 1, image: image_base_64}.to_json.to_s
  date = Time.now.httpdate.to_s

  auth_header = authorization_header_for_request(access_key, secret_key, http_method, request_body, content_type, date, TARGETS_PATH)
  
  http = Net::HTTP.new(VWS_ENDPOINT, 443)
  http.use_ssl = true
  req = Net::HTTP::Post.new(TARGETS_PATH, 'Content-Type' => content_type, 'Accept' => content_type, 'Date' => date, 'Authorization' => auth_header)

  req.body = request_body
  res = http.request(req)
  puts "response #{res.body}"
end