Refactor XML parsing.

lib/pleroma/web/xml/xml.ex

@@ -0,0 +1,19 @@
+defmodule Pleroma.Web.XML do
+  def string_from_xpath(xpath, doc) do
+    {:xmlObj, :string, res} = :xmerl_xpath.string('string(#{xpath})', doc)
+
+    res = res
+    |> to_string
+    |> String.trim
+
+    if res == "", do: nil, else: res
+  end
+
+  def parse_document(text) do
+    {doc, _rest} = text
+    |> :binary.bin_to_list
+    |> :xmerl_scan.string
+
+    doc
+  end
+end