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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.XmlBuilder do
   6   def to_xml({tag, attributes, content}) do
   7     open_tag = make_open_tag(tag, attributes)
   8
   9     content_xml = to_xml(content)
  10
  11     "<#{open_tag}>#{content_xml}</#{tag}>"
  12   end
  13
  14   def to_xml({tag, %{} = attributes}) do
  15     open_tag = make_open_tag(tag, attributes)
  16
  17     "<#{open_tag} />"
  18   end
  19
  20   def to_xml({tag, content}), do: to_xml({tag, %{}, content})
  21
  22   def to_xml(content) when is_binary(content) do
  23     to_string(content)
  24   end
  25
  26   def to_xml(content) when is_list(content) do
  27     for element <- content do
  28       to_xml(element)
  29     end
  30     |> Enum.join()
  31   end
  32
  33   def to_xml(%NaiveDateTime{} = time) do
  34     NaiveDateTime.to_iso8601(time)
  35   end
  36
  37   def to_doc(content), do: ~s(<?xml version="1.0" encoding="UTF-8"?>) <> to_xml(content)
  38
  39   defp make_open_tag(tag, attributes) do
  40     attributes_string =
  41       for {attribute, value} <- attributes do
  42         value = String.replace(value, "\"", "&quot;")
  43         "#{attribute}=\"#{value}\""
  44       end
  45       |> Enum.join(" ")
  46
  47     [tag, attributes_string] |> Enum.join(" ") |> String.trim()
  48   end
  49 end