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) 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       ] ++
  22         if attachments == [] or
  23              Enum.any?(activity.data["object"]["tag"], fn tag -> tag == "nsfw" end) 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       ]
  50     end
  51   end
  52
  53   defp build_attachments(activity) do
  54     Enum.reduce(activity.data["object"]["attachment"], [], fn attachment, acc ->
  55       rendered_tags =
  56         Enum.map(attachment["url"], fn url ->
  57           media_type =
  58             Enum.find(["image", "audio", "video"], fn media_type ->
  59               String.starts_with?(url["mediaType"], media_type)
  60             end)
  61
  62           if media_type do
  63             {:meta, [property: "og:" <> media_type, content: attachment_url(url["href"])], []}
  64           else
  65             nil
  66           end
  67         end)
  68
  69       Enum.reject(rendered_tags, &is_nil/1)
  70       acc ++ rendered_tags
  71     end)
  72   end
  73
  74   defp scrub_html_and_truncate(%{data: %{ "object" => %{ "content" => content}}} = activity) do
  75     content
  76     # html content comes from DB already encoded, decode first and scrub after
  77     |> HtmlEntities.decode()
  78     |> String.replace(~r/<br\s?\/?>/, " ")
  79     |> HTML.get_cached_stripped_html_for_object(activity, __MODULE__)
  80     |> Formatter.truncate()
  81   end
  82
  83   defp scrub_html_and_truncate(content) do
  84     content
  85     # html content comes from DB already encoded, decode first and scrub after
  86     |> HtmlEntities.decode()
  87     |> String.replace(~r/<br\s?\/?>/, " ")
  88     |> HTML.strip_tags()
  89     |> Formatter.truncate()
  90   end
  91   defp attachment_url(url) do
  92     MediaProxy.url(url)
  93   end
  94
  95   defp user_name_string(user) do
  96     "#{user.name} " <>
  97       if user.local do
  98         "(@#{user.nickname}@#{Pleroma.Web.Endpoint.host()})"
  99       else
 100         "(@#{user.nickname})"
 101       end
 102   end
 103 end