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

   1 defmodule Pleroma.Web.Metadata do
   2   alias Phoenix.HTML
   3   alias Pleroma.{Web, Formatter}
   4   alias Pleroma.{User, Activity}
   5   alias Pleroma.Web.MediaProxy
   6
   7   def build_tags(activity, user, url) do
   8     Enum.concat([
   9       if(meta_enabled?(:opengraph), do: opengraph_tags(activity, user), else: []),
  10       if(meta_enabled?(:oembed), do: oembed_links(url), else: [])
  11     ])
  12     |> Enum.map(&to_tag/1)
  13     |> Enum.map(&HTML.safe_to_string/1)
  14     |> Enum.join("\n")
  15   end
  16
  17   def meta_enabled?(type) do
  18     config = Pleroma.Config.get(:metadata, [])
  19     Keyword.get(config, type, false)
  20   end
  21
  22   def to_tag(data) do
  23     with {name, attrs, _content = []} <- data do
  24       HTML.Tag.tag(name, attrs)
  25     else
  26       {name, attrs, content} ->
  27         HTML.Tag.content_tag(name, content, attrs)
  28
  29       _ ->
  30         raise ArgumentError, message: "make_tag invalid args"
  31     end
  32   end
  33
  34   defp oembed_links(url) do
  35     Enum.map(["xml", "json"], fn format ->
  36       href = HTML.raw(oembed_path(url, format))
  37       { :link, [ type: ["application/#{format}+oembed"], href: href, rel: 'alternate'], [] }
  38     end)
  39   end
  40
  41   defp opengraph_tags(activity, user) do
  42     with image = User.avatar_url(user) |> MediaProxy.url(),
  43          truncated_content = Formatter.truncate(activity.data["object"]["content"]),
  44          domain = Pleroma.Config.get([:instance, :domain], "UNKNOWN_DOMAIN") do
  45       [
  46         {:meta,
  47           [
  48             property: "og:title",
  49             content: "#{user.name} (@#{user.nickname}@#{domain}) post ##{activity.id}"
  50           ], []},
  51         {:meta, [property: "og:url", content: activity.data["id"]], []},
  52         {:meta, [property: "og:description", content: truncated_content],
  53           []},
  54         {:meta, [property: "og:image", content: image], []},
  55         {:meta, [property: "og:image:width", content: 120], []},
  56         {:meta, [property: "og:image:height", content: 120], []},
  57         {:meta, [property: "twitter:card", content: "summary"], []}
  58       ]
  59     end
  60   end
  61
  62   defp oembed_path(url, format) do
  63     query = URI.encode_query(%{url: url, format: format})
  64     "#{Web.base_url()}/oembed?#{query}"
  65   end
  66 end