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

   1 defmodule Pleroma.Web.Metadata.Providers.OpenGraph do
   2   alias Pleroma.Web.Metadata.Providers.Provider
   3   alias Pleroma.{HTML, Formatter, User}
   4   alias Pleroma.Web.MediaProxy
   5
   6   @behaviour Provider
   7
   8   @impl Provider
   9   def build_tags(%{activity: activity, user: user}) do
  10     with truncated_content = scrub_html_and_truncate(activity.data["object"]["content"]) do
  11       attachments = build_attachments(activity)
  12
  13       [
  14         {:meta,
  15          [
  16            property: "og:title",
  17            content: user_name_string(user)
  18          ], []},
  19         {:meta, [property: "og:url", content: activity.data["id"]], []},
  20         {:meta, [property: "og:description", content: truncated_content], []},
  21         {:meta, [property: "twitter:card", content: "summary"], []}
  22       ] ++
  23         if attachments == [] do
  24           [
  25             {:meta, [property: "og:image", content: attachment_url(User.avatar_url(user))], []},
  26             {:meta, [property: "og:image:width", content: 120], []},
  27             {:meta, [property: "og:image:height", content: 120], []}
  28           ]
  29         else
  30           attachments
  31         end
  32     end
  33   end
  34
  35   @impl Provider
  36   def build_tags(%{user: user}) do
  37     with truncated_bio = scrub_html_and_truncate(user.bio || "") do
  38       [
  39         {:meta,
  40          [
  41            property: "og:title",
  42            content: user_name_string(user)
  43          ], []},
  44         {:meta, [property: "og:url", content: User.profile_url(user)], []},
  45         {:meta, [property: "og:description", content: truncated_bio], []},
  46         {:meta, [property: "og:image", content: attachment_url(User.avatar_url(user))], []},
  47         {:meta, [property: "og:image:width", content: 120], []},
  48         {:meta, [property: "og:image:height", content: 120], []},
  49         {:meta, [property: "twitter:card", content: "summary"], []}
  50       ]
  51     end
  52   end
  53
  54   defp build_attachments(activity) do
  55     Enum.reduce(activity.data["object"]["attachment"], [], fn attachment, acc ->
  56       rendered_tags =
  57         Enum.map(attachment["url"], fn url ->
  58           media_type =
  59             Enum.find(["image", "audio", "video"], fn media_type ->
  60               String.starts_with?(url["mediaType"], media_type)
  61             end)
  62
  63           if media_type do
  64             {:meta, [property: "og:" <> media_type, content: attachment_url(url["href"])], []}
  65           else
  66             nil
  67           end
  68         end)
  69
  70       Enum.reject(rendered_tags, &is_nil/1)
  71       acc ++ rendered_tags
  72     end)
  73   end
  74
  75   defp scrub_html_and_truncate(content) do
  76     content
  77     # html content comes from DB already encoded, decode first and scrub after
  78     |> HtmlEntities.decode()
  79     |> String.replace(~r/<br\s?\/?>/, " ")
  80     |> HTML.strip_tags()
  81     |> Formatter.truncate()
  82   end
  83
  84   defp attachment_url(url) do
  85     MediaProxy.url(url)
  86   end
  87
  88   defp user_name_string(user) do
  89     "#{user.name}" <>
  90       if user.local do
  91         "(@#{user.nickname}@#{Pleroma.Web.Endpoint.host()})"
  92       else
  93         "(@#{user.nickname})"
  94       end
  95   end
  96 end