switch to captcha v2 api

app_helpers.rb

@@ -122,3 +122,21 @@ end
 def flash_display(opts={})
   erb :'_flash', layout: false, locals: {opts: opts}
 end
+
+def recaptcha_valid?
+  return true if ENV['RACK_ENV'] == 'test' || ENV['TRAVIS']
+  return false unless params[:'g-recaptcha-response']
+  resp = Net::HTTP.get URI(
+    'https://www.google.com/recaptcha/api/siteverify?'+
+    Rack::Utils.build_query(
+      secret: $config['recaptcha_private_key'],
+      response: params[:'g-recaptcha-response']
+    )
+  )
+
+  if JSON.parse(resp)['success'] == true
+    true
+  else
+    false
+  end
+end