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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.Web.XML do
   6   require Logger
   7
   8   def string_from_xpath(_, :error), do: nil
   9
  10   def string_from_xpath(xpath, doc) do
  11     try do
  12       {:xmlObj, :string, res} = :xmerl_xpath.string('string(#{xpath})', doc)
  13
  14       res =
  15         res
  16         |> to_string
  17         |> String.trim()
  18
  19       if res == "", do: nil, else: res
  20     catch
  21       _e ->
  22         Logger.debug("Couldn't find xpath #{xpath} in XML doc")
  23         nil
  24     end
  25   end
  26
  27   def parse_document(text) do
  28     try do
  29       {doc, _rest} =
  30         text
  31         |> :binary.bin_to_list()
  32         |> :xmerl_scan.string(quiet: true)
  33
  34       {:ok, doc}
  35     rescue
  36       _e ->
  37         Logger.debug("Couldn't parse XML: #{inspect(text)}")
  38         :error
  39     catch
  40       :exit, _error ->
  41         Logger.debug("Couldn't parse XML: #{inspect(text)}")
  42         :error
  43     end
  44   end
  45 end