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

   1 defmodule Pleroma.Web.Metadata do
   2   alias Phoenix.HTML
   3   alias Pleroma.{Formatter, User}
   4   alias Pleroma.Web.MediaProxy
   5
   6   def build_tags(params) do
   7     if(meta_enabled?(:opengraph), do: opengraph_tags(params), else: [])
   8     |> Enum.map(&to_tag/1)
   9     |> Enum.map(&HTML.safe_to_string/1)
  10     |> Enum.join("\n")
  11   end
  12
  13   def meta_enabled?(type) do
  14     Pleroma.Config.get([:metadata, type], false)
  15   end
  16
  17   # opengraph for single status
  18   defp opengraph_tags(%{activity: activity, user: user}) do
  19     with truncated_content = scrub_html_and_truncate(activity.data["object"]["content"]) do
  20       [
  21         {:meta,
  22          [
  23            property: "og:title",
  24            content: "#{user.name} (@#{user.nickname}@#{pleroma_domain()}) post ##{activity.id}"
  25          ], []},
  26         {:meta, [property: "og:url", content: activity.data["id"]], []},
  27         {:meta, [property: "og:description", content: truncated_content], []},
  28         {:meta, [property: "og:image", content: user_avatar_url(user)], []},
  29         {:meta, [property: "og:image:width", content: 120], []},
  30         {:meta, [property: "og:image:height", content: 120], []},
  31         {:meta, [property: "twitter:card", content: "summary"], []}
  32       ]
  33     end
  34   end
  35
  36   # opengraph for user card
  37   defp opengraph_tags(%{user: user}) do
  38     with truncated_bio = scrub_html_and_truncate(user.bio) do
  39       [
  40         {:meta,
  41          [
  42            property: "og:title",
  43            content: "#{user.name} (@#{user.nickname}@#{pleroma_domain()}) profile"
  44          ], []},
  45         {:meta, [property: "og:url", content: User.profile_url(user)], []},
  46         {:meta, [property: "og:description", content: truncated_bio], []},
  47         {:meta, [property: "og:image", content: user_avatar_url(user)], []},
  48         {:meta, [property: "og:image:width", content: 120], []},
  49         {:meta, [property: "og:image:height", content: 120], []},
  50         {:meta, [property: "twitter:card", content: "summary"], []}
  51       ]
  52     end
  53   end
  54
  55   def to_tag(data) do
  56     with {name, attrs, _content = []} <- data do
  57       HTML.Tag.tag(name, attrs)
  58     else
  59       {name, attrs, content} ->
  60         HTML.Tag.content_tag(name, content, attrs)
  61
  62       _ ->
  63         raise ArgumentError, message: "make_tag invalid args"
  64     end
  65   end
  66
  67   defp scrub_html_and_truncate(content) do
  68     content
  69     # html content comes from DB already encoded, decode first and scrub after
  70     |> HtmlEntities.decode()
  71     |> Pleroma.HTML.strip_tags()
  72     |> Formatter.truncate()
  73   end
  74
  75   defp user_avatar_url(user) do
  76     User.avatar_url(user) |> MediaProxy.url()
  77   end
  78
  79   def pleroma_domain do
  80     Pleroma.Web.Endpoint.host()
  81   end
  82 end