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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4 defmodule Pleroma.Web.Metadata do
   5   alias Phoenix.HTML
   6
   7   @providers Pleroma.Config.get([__MODULE__, :providers], [])
   8
   9   def build_tags(params) do
  10     Enum.reduce(@providers, "", fn parser, acc ->
  11       rendered_html =
  12         params
  13         |> parser.build_tags()
  14         |> Enum.map(&to_tag/1)
  15         |> Enum.map(&HTML.safe_to_string/1)
  16         |> Enum.join()
  17
  18       acc <> rendered_html
  19     end)
  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 end