akkoma/lib/pleroma/web/xml/xml.ex

defmodule Pleroma.Web.XML do
  require Logger

  def string_from_xpath(_, :error), do: nil

  def string_from_xpath(xpath, doc) do
    try do
      {:xmlObj, :string, res} = :xmerl_xpath.string('string(#{xpath})', doc)

      res =
        res
        |> to_string
        |> String.trim()

      if res == "", do: nil, else: res
    catch
      _e ->
        Logger.debug("Couldn't find xpath #{xpath} in XML doc")
        nil
    end
  end

  def parse_document(text) do
    try do
      {doc, _rest} =
        text
        |> :binary.bin_to_list()
        |> :xmerl_scan.string(quiet: true)

      doc
    rescue
      _e ->
        Logger.debug("Couldn't parse XML: #{inspect(text)}")
        :error
    catch
      :exit, _error ->
        Logger.debug("Couldn't parse XML: #{inspect(text)}")
        :error
    end
  end
end