defmodule Pleroma.Web.Metadata do alias Phoenix.HTML alias Pleroma.{Formatter, User} alias Pleroma.Web.MediaProxy def build_tags(params) do if(meta_enabled?(:opengraph), do: opengraph_tags(params), else: []) |> Enum.map(&to_tag/1) |> Enum.map(&HTML.safe_to_string/1) |> Enum.join("\n") end def meta_enabled?(type) do Pleroma.Config.get([:metadata, type], false) end # opengraph for single status defp opengraph_tags(%{activity: activity, user: user}) do with truncated_content = scrub_html_and_truncate(activity.data["object"]["content"]) do [ {:meta, [ property: "og:title", content: "#{user.name}" <> if user.local do "(@#{user.nickname}@{pleroma_domain})" else "(@#{user.nickname})" end ], []}, {:meta, [property: "og:url", content: activity.data["id"]], []}, {:meta, [property: "og:description", content: truncated_content], []}, {:meta, [property: "og:image", content: user_avatar_url(user)], []}, {:meta, [property: "og:image:width", content: 120], []}, {:meta, [property: "og:image:height", content: 120], []}, {:meta, [property: "twitter:card", content: "summary"], []} ] end end # opengraph for user card defp opengraph_tags(%{user: user}) do with truncated_bio = scrub_html_and_truncate(user.bio || "") do [ {:meta, [ property: "og:title", content: "#{user.name} (@#{user.nickname}@#{pleroma_domain()}) profile" ], []}, {:meta, [property: "og:url", content: User.profile_url(user)], []}, {:meta, [property: "og:description", content: truncated_bio], []}, {:meta, [property: "og:image", content: user_avatar_url(user)], []}, {:meta, [property: "og:image:width", content: 120], []}, {:meta, [property: "og:image:height", content: 120], []}, {:meta, [property: "twitter:card", content: "summary"], []} ] end end def to_tag(data) do with {name, attrs, _content = []} <- data do HTML.Tag.tag(name, attrs) else {name, attrs, content} -> HTML.Tag.content_tag(name, content, attrs) _ -> raise ArgumentError, message: "make_tag invalid args" end end defp scrub_html_and_truncate(content) do content # html content comes from DB already encoded, decode first and scrub after |> HtmlEntities.decode() |> Pleroma.HTML.strip_tags() |> Formatter.truncate() end defp user_avatar_url(user) do User.avatar_url(user) |> MediaProxy.url() end def pleroma_domain do Pleroma.Web.Endpoint.host() end end