asset_data_uri.rb

module ApplicationHelper
  # a helper to get a data uri for an image asset
  # e.g. <img src="<%= asset_data_uri('facebook.png') %>" />
  def asset_data_uri(path)
    asset  = asset_paths.asset_for path, nil
    base64 = Base64.encode64(asset.to_s).gsub(/\s+/, "")
    "data:#{asset.content_type};base64,#{Rack::Utils.escape(base64)}"
  end
end