app/helpers/open_graph_helper.rb

   1 module OpenGraphHelper
   2   require "addressable/uri"
   3
   4   def opengraph_tags(title = nil, og_image = nil)
   5     tags = {
   6       "og:site_name" => t("layouts.project_name.title"),
   7       "og:title" => title || t("layouts.project_name.title"),
   8       "og:type" => "website",
   9       "og:image" => og_image_url(og_image),
  10       "og:url" => url_for(:only_path => false),
  11       "og:description" => t("layouts.intro_text")
  12     }
  13
  14     safe_join(tags.map do |property, content|
  15       tag.meta(:property => property, :content => content)
  16     end, "\n")
  17   end
  18
  19   private
  20
  21   def og_image_url(og_image)
  22     begin
  23       return Addressable::URI.join(root_url, og_image).normalize if og_image
  24     rescue Addressable::URI::InvalidURIError
  25       # return default image
  26     end
  27     image_url("osm_logo_256.png")
  28   end
  29 end