mock_engine.rb

get "/API/Internal/Users/:UserID/Signatures" do
  content_type :json
  Signature.all(:UserID => params[:UserID]).to_json
end

get "/API/Internal/Users/:UserID/Signatures/:ID" do
  content_type :json
  Signature.first(:UserID => params[:UserID], :ID => params[:ID]).to_json
end

get "/API/Internal/Users/:UserID/Signatures/:ID/Resend" do
  # nothing
end

post "/API/Internal/Users/:UserID/Signatures" do
  content_type :json
  signature = Signature.new
  signature.attributes = JSON.parse(request.body.read)
  signature.UserID = params[:UserID]

  if signature.save
    status 200
    signature.to_json
  else
    status 422
  end
end

put "/API/Internal/Users/:UserID/Signatures/:ID" do
  signature = Signature.first(:UserID => params[:UserID], :ID => params[:ID])
  if signature.update(JSON.parse(request.body.read))
    status 200
    signature.to_json
  else
    status 422
  end
end

delete "/API/Internal/Users/:UserID/Signatures/:ID" do
  signature = Signature.first(:UserID => params[:UserID], :ID => params[:ID])
  signature.destroy!
end