git.squeep.com Git - akkoma/blob - lib/pleroma/web/metadata/twitter_card.ex

   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.Metadata.Providers.TwitterCard do
   6   alias Pleroma.Web.Metadata.Providers.Provider
   7   alias Pleroma.Web.Metadata
   8
   9   @behaviour Provider
  10
  11   @impl Provider
  12   def build_tags(%{object: object}) do
  13     if Metadata.activity_nsfw?(object) or object.data["attachment"] == [] do
  14       build_tags(nil)
  15     else
  16       case find_first_acceptable_media_type(object) do
  17         "image" ->
  18           [{:meta, [property: "twitter:card", content: "summary_large_image"], []}]
  19
  20         "audio" ->
  21           [{:meta, [property: "twitter:card", content: "player"], []}]
  22
  23         "video" ->
  24           [{:meta, [property: "twitter:card", content: "player"], []}]
  25
  26         _ ->
  27           build_tags(nil)
  28       end
  29     end
  30   end
  31
  32   @impl Provider
  33   def build_tags(_) do
  34     [{:meta, [property: "twitter:card", content: "summary"], []}]
  35   end
  36
  37   def find_first_acceptable_media_type(%{data: %{"attachment" => attachment}}) do
  38     Enum.find_value(attachment, fn attachment ->
  39       Enum.find_value(attachment["url"], fn url ->
  40         Enum.find(["image", "audio", "video"], fn media_type ->
  41           String.starts_with?(url["mediaType"], media_type)
  42         end)
  43       end)
  44     end)
  45   end
  46 end