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1 files changed, 48 insertions, 0 deletions

diff --git a/lib/pleroma/web/xml.ex b/lib/pleroma/web/xml.ex
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+++ b/lib/pleroma/web/xml.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+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,
+          fetch_fun: fn _, _ -> raise "Resolving external entities not supported" end
+        )
+
+      {:ok, 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