module OpenGraphHelper require "addressable/uri" def opengraph_tags(title = nil, og_image = nil, og_image_alt = nil) tags = { "og:site_name" => t("layouts.project_name.title"), "og:title" => title || t("layouts.project_name.title"), "og:type" => "website", "og:url" => url_for(:only_path => false), "og:description" => t("layouts.intro_text") }.merge( opengraph_image_properties(og_image, og_image_alt) ) safe_join(tags.map do |property, content| tag.meta(:property => property, :content => content) end, "\n") end private def opengraph_image_properties(og_image, og_image_alt) begin if og_image properties = {} properties["og:image"] = Addressable::URI.join(root_url, og_image).normalize properties["og:image:alt"] = og_image_alt if og_image_alt return properties end rescue Addressable::URI::InvalidURIError # return default image end { "og:image" => image_url("osm_logo_256.png"), "og:image:alt" => t("layouts.logo.alt_text") } end end