From bf9d3d4abaecc4e842c38866f039ebd8f5f96948 Mon Sep 17 00:00:00 2001
From: William Pitcock <nenolod@dereferenced.org>
Date: Tue, 3 Apr 2018 19:43:59 +0000
Subject: [PATCH] XML: use try/catch with XPath functions

---
 lib/pleroma/web/xml/xml.ex | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/lib/pleroma/web/xml/xml.ex b/lib/pleroma/web/xml/xml.ex
index b85712d65..8b609f695 100644
--- a/lib/pleroma/web/xml/xml.ex
+++ b/lib/pleroma/web/xml/xml.ex
@@ -4,14 +4,20 @@ defmodule Pleroma.Web.XML do
   def string_from_xpath(_, :error), do: nil
 
   def string_from_xpath(xpath, doc) do
-    {:xmlObj, :string, res} = :xmerl_xpath.string('string(#{xpath})', doc)
+    try do
+      {:xmlObj, :string, res} = :xmerl_xpath.string('string(#{xpath})', doc)
 
-    res =
-      res
-      |> to_string
-      |> String.trim()
+      res =
+        res
+        |> to_string
+        |> String.trim()
 
-    if res == "", do: nil, else: res
+      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