# Pleroma: A lightweight social networking server # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Web.Metadata.Providers.TwitterCard do alias Pleroma.User alias Pleroma.Web.Metadata alias Pleroma.Web.Metadata.Providers.Provider alias Pleroma.Web.Metadata.Utils @behaviour Provider @impl Provider def build_tags(%{ activity_id: id, object: object, user: user }) do attachments = build_attachments(id, object) scrubbed_content = Utils.scrub_html_and_truncate(object) # Zero width space content = if scrubbed_content != "" and scrubbed_content != "\u200B" do "“" <> scrubbed_content <> "”" else "" end [ {:meta, [ property: "twitter:title", content: Utils.user_name_string(user) ], []}, {:meta, [ property: "twitter:description", content: content ], []} ] ++ if attachments == [] or Metadata.activity_nsfw?(object) do [ {:meta, [property: "twitter:image", content: Utils.attachment_url(User.avatar_url(user))], []}, {:meta, [property: "twitter:card", content: "summary_large_image"], []} ] else attachments end end @impl Provider def build_tags(%{user: user}) do with truncated_bio = Utils.scrub_html_and_truncate(user.bio || "") do [ {:meta, [ property: "twitter:title", content: Utils.user_name_string(user) ], []}, {:meta, [property: "twitter:description", content: truncated_bio], []}, {:meta, [property: "twitter:image", content: Utils.attachment_url(User.avatar_url(user))], []}, {:meta, [property: "twitter:card", content: "summary"], []} ] end end defp build_attachments(id, %{data: %{"attachment" => attachments}}) do Enum.reduce(attachments, [], fn attachment, acc -> rendered_tags = Enum.reduce(attachment["url"], [], fn url, acc -> media_type = Enum.find(["image", "audio", "video"], fn media_type -> String.starts_with?(url["mediaType"], media_type) end) # TODO: Add additional properties to objects when we have the data available. case media_type do "audio" -> [ {:meta, [property: "twitter:card", content: "player"], []}, {:meta, [property: "twitter:player:width", content: "480"], []}, {:meta, [property: "twitter:player:height", content: "80"], []}, {:meta, [property: "twitter:player", content: player_url(id)], []} | acc ] "image" -> [ {:meta, [property: "twitter:card", content: "summary_large_image"], []}, {:meta, [ property: "twitter:player", content: Utils.attachment_url(url["href"]) ], []} | acc ] # TODO: Need the true width and height values here or Twitter renders an iFrame with # a bad aspect ratio "video" -> [ {:meta, [property: "twitter:card", content: "player"], []}, {:meta, [property: "twitter:player", content: player_url(id)], []}, {:meta, [property: "twitter:player:width", content: "480"], []}, {:meta, [property: "twitter:player:height", content: "480"], []} | acc ] _ -> acc end end) acc ++ rendered_tags end) end defp player_url(id) do Pleroma.Web.Router.Helpers.o_status_url(Pleroma.Web.Endpoint, :notice_player, id) end end