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.User
   7   alias Pleroma.Web.Metadata
   8   alias Pleroma.Web.Metadata.Providers.Provider
   9   alias Pleroma.Web.Metadata.Utils
  10
  11   @behaviour Provider
  12
  13   @impl Provider
  14   def build_tags(%{
  15         activity_id: id,
  16         object: object,
  17         user: user
  18       }) do
  19     attachments = build_attachments(id, object)
  20     scrubbed_content = Utils.scrub_html_and_truncate(object)
  21     # Zero width space
  22     content =
  23       if scrubbed_content != "" and scrubbed_content != "\u200B" do
  24         "“" <> scrubbed_content <> "”"
  25       else
  26         ""
  27       end
  28
  29     [
  30       {:meta,
  31        [
  32          property: "twitter:title",
  33          content: Utils.user_name_string(user)
  34        ], []},
  35       {:meta,
  36        [
  37          property: "twitter:description",
  38          content: content
  39        ], []}
  40     ] ++
  41       if attachments == [] or Metadata.activity_nsfw?(object) do
  42         [
  43           {:meta,
  44            [property: "twitter:image", content: Utils.attachment_url(User.avatar_url(user))], []},
  45           {:meta, [property: "twitter:card", content: "summary_large_image"], []}
  46         ]
  47       else
  48         attachments
  49       end
  50   end
  51
  52   @impl Provider
  53   def build_tags(%{user: user}) do
  54     with truncated_bio = Utils.scrub_html_and_truncate(user.bio || "") do
  55       [
  56         {:meta,
  57          [
  58            property: "twitter:title",
  59            content: Utils.user_name_string(user)
  60          ], []},
  61         {:meta, [property: "twitter:description", content: truncated_bio], []},
  62         {:meta, [property: "twitter:image", content: Utils.attachment_url(User.avatar_url(user))],
  63          []},
  64         {:meta, [property: "twitter:card", content: "summary"], []}
  65       ]
  66     end
  67   end
  68
  69   defp build_attachments(id, %{data: %{"attachment" => attachments}}) do
  70     Enum.reduce(attachments, [], fn attachment, acc ->
  71       rendered_tags =
  72         Enum.reduce(attachment["url"], [], fn url, acc ->
  73           media_type =
  74             Enum.find(["image", "audio", "video"], fn media_type ->
  75               String.starts_with?(url["mediaType"], media_type)
  76             end)
  77
  78           # TODO: Add additional properties to objects when we have the data available.
  79           case media_type do
  80             "audio" ->
  81               [
  82                 {:meta, [property: "twitter:card", content: "player"], []},
  83                 {:meta, [property: "twitter:player:width", content: "480"], []},
  84                 {:meta, [property: "twitter:player:height", content: "80"], []},
  85                 {:meta, [property: "twitter:player", content: player_url(id)], []}
  86                 | acc
  87               ]
  88
  89             "image" ->
  90               [
  91                 {:meta, [property: "twitter:card", content: "summary_large_image"], []},
  92                 {:meta,
  93                  [
  94                    property: "twitter:player",
  95                    content: Utils.attachment_url(url["href"])
  96                  ], []}
  97                 | acc
  98               ]
  99
 100             # TODO: Need the true width and height values here or Twitter renders an iFrame with a bad aspect ratio
 101             "video" ->
 102               [
 103                 {:meta, [property: "twitter:card", content: "player"], []},
 104                 {:meta, [property: "twitter:player", content: player_url(id)], []},
 105                 {:meta, [property: "twitter:player:width", content: "480"], []},
 106                 {:meta, [property: "twitter:player:height", content: "480"], []}
 107                 | acc
 108               ]
 109
 110             _ ->
 111               acc
 112           end
 113         end)
 114
 115       acc ++ rendered_tags
 116     end)
 117   end
 118
 119   defp player_url(id) do
 120     Pleroma.Web.Router.Helpers.o_status_url(Pleroma.Web.Endpoint, :notice_player, id)
 121   end
 122 end