app/helpers/open_graph_helper.rb

   1 # frozen_string_literal: true
   2
   3 module OpenGraphHelper
   4   require "addressable/uri"
   5
   6   def opengraph_tags(title, properties)
   7     tags = {
   8       "og:site_name" => t("layouts.project_name.title"),
   9       "og:title" => properties["og:title"] || title || t("layouts.project_name.title"),
  10       "og:type" => "website",
  11       "og:url" => url_for(:only_path => false),
  12       "og:description" => properties["og:description"] || t("layouts.intro_text")
  13     }.merge(
  14       opengraph_image_properties(properties)
  15     ).merge(
  16       properties.slice("article:published_time")
  17     )
  18
  19     safe_join(tags.map do |property, content|
  20       tag.meta(:property => property, :content => content)
  21     end, "\n")
  22   end
  23
  24   private
  25
  26   def opengraph_image_properties(properties)
  27     begin
  28       if properties["og:image"]
  29         image_properties = {}
  30         image_properties["og:image"] = Addressable::URI.join(root_url, properties["og:image"]).normalize
  31         image_properties["og:image:alt"] = properties["og:image:alt"] if properties["og:image:alt"]
  32         return image_properties
  33       end
  34     rescue Addressable::URI::InvalidURIError
  35       # return default image
  36     end
  37     {
  38       "og:image" => image_url("osm_logo_256.png"),
  39       "og:image:alt" => t("layouts.logo.alt_text")
  40     }
  41   end
  42 end