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   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 defmodule Pleroma.Web.Metadata.Providers.TwitterCard do
   5   alias Pleroma.Web.Metadata.Providers.Provider
   6
   7   @behaviour Provider
   8
   9   @impl Provider
  10   def build_tags(%{activity: activity}) do
  11     if Enum.any?(activity.data["object"]["tag"], fn tag -> tag == "nsfw" end) or
  12          activity.data["object"]["attachment"] == [] do
  13       build_tags(nil)
  14     else
  15       case find_first_acceptable_media_type(activity) do
  16         "image" ->
  17           [{:meta, [property: "twitter:card", content: "summary_large_image"], []}]
  18
  19         "audio" ->
  20           [{:meta, [property: "twitter:card", content: "player"], []}]
  21
  22         "video" ->
  23           [{:meta, [property: "twitter:card", content: "player"], []}]
  24
  25         _ ->
  26           build_tags(nil)
  27       end
  28     end
  29   end
  30
  31   @impl Provider
  32   def build_tags(_) do
  33     [{:meta, [property: "twitter:card", content: "summary"], []}]
  34   end
  35
  36   def find_first_acceptable_media_type(%{data: %{"object" => %{"attachment" => attachment}}}) do
  37     Enum.find_value(attachment, fn attachment ->
  38       Enum.find_value(attachment["url"], fn url ->
  39         Enum.find(["image", "audio", "video"], fn media_type ->
  40           String.starts_with?(url["mediaType"], media_type)
  41         end)
  42       end)
  43     end)
  44   end
  45 end