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()
  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:
  25              "#{user.name}" <>
  26                if user.local do
  27                  "(@#{user.nickname}@{pleroma_domain})"
  28                else
  29                  "(@#{user.nickname})"
  30                end
  31          ], []},
  32         {:meta, [property: "og:url", content: activity.data["id"]], []},
  33         {:meta, [property: "og:description", content: truncated_content], []},
  34         {:meta, [property: "og:image", content: user_avatar_url(user)], []},
  35         {:meta, [property: "og:image:width", content: 120], []},
  36         {:meta, [property: "og:image:height", content: 120], []},
  37         {:meta, [property: "twitter:card", content: "summary"], []}
  38       ]
  39     end
  40   end
  41
  42   # opengraph for user card
  43   defp opengraph_tags(%{user: user}) do
  44     with truncated_bio = scrub_html_and_truncate(user.bio || "") do
  45       [
  46         {:meta,
  47          [
  48            property: "og:title",
  49            content: "#{user.name} (@#{user.nickname}@#{pleroma_domain()}) profile"
  50          ], []},
  51         {:meta, [property: "og:url", content: User.profile_url(user)], []},
  52         {:meta, [property: "og:description", content: truncated_bio], []},
  53         {:meta, [property: "og:image", content: user_avatar_url(user)], []},
  54         {:meta, [property: "og:image:width", content: 120], []},
  55         {:meta, [property: "og:image:height", content: 120], []},
  56         {:meta, [property: "twitter:card", content: "summary"], []}
  57       ]
  58     end
  59   end
  60
  61   defp opengraph_tags(_) do
  62     []
  63   end
  64
  65   def to_tag(data) do
  66     with {name, attrs, _content = []} <- data do
  67       HTML.Tag.tag(name, attrs)
  68     else
  69       {name, attrs, content} ->
  70         HTML.Tag.content_tag(name, content, attrs)
  71
  72       _ ->
  73         raise ArgumentError, message: "make_tag invalid args"
  74     end
  75   end
  76
  77   defp scrub_html_and_truncate(content) do
  78     content
  79     # html content comes from DB already encoded, decode first and scrub after
  80     |> HtmlEntities.decode()
  81     |> Pleroma.HTML.strip_tags()
  82     |> Formatter.truncate()
  83   end
  84
  85   defp user_avatar_url(user) do
  86     User.avatar_url(user) |> MediaProxy.url()
  87   end
  88
  89   def pleroma_domain do
  90     Pleroma.Web.Endpoint.host()
  91   end
  92 end