From 8f070f53eccd0e87ca835966a332c2aa2dbea65f Mon Sep 17 00:00:00 2001
From: tenma <brvnocasteleiro@gmail.com>
Date: Sun, 1 Sep 2019 21:33:11 +0100
Subject: [PATCH] [CORE] Fix undefined offset warnings in different files

This problem was presentend in the following issue:
https://notabug.org/diogo/gnu-social/issues/60

AcceptHeader/util:
- Perform isset before using the required array values
---
 extlib/AcceptHeader.php | 18 ++++++++++++------
 lib/util.php            |  4 ++--
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/extlib/AcceptHeader.php b/extlib/AcceptHeader.php
index e146ec8231..c62ee916eb 100644
--- a/extlib/AcceptHeader.php
+++ b/extlib/AcceptHeader.php
@@ -49,12 +49,18 @@ class AcceptHeader extends \ArrayObject
         foreach ($items as $item) {
             $elems = explode(';', $item);
 
-            $acceptElement = [];
-            $mime = current($elems);
-            list($type, $subtype) = explode('/', $mime);
-            $acceptElement['type'] = trim($type);
-            $acceptElement['subtype'] = trim($subtype);
-            $acceptElement['raw'] = $mime;
+            $mime  = current($elems);
+            $types = explode('/', $mime);
+
+            if (!isset($types[1])) {
+                continue;
+            }
+
+            $acceptElement = [
+                'raw'     => $mime,
+                'type'    => trim($types[0]),
+                'subtype' => trim($types[1]),
+            ];
 
             $acceptElement['params'] = [];
             while (next($elems)) {
diff --git a/lib/util.php b/lib/util.php
index e7c92dedd0..5274045ee6 100644
--- a/lib/util.php
+++ b/lib/util.php
@@ -2100,7 +2100,7 @@ function common_negotiate_type($cprefs, $sprefs)
 
     foreach (array_keys($sprefs) as $type) {
         $parts = explode('/', $type);
-        if ($parts[1] != '*') {
+        if (isset($parts[1]) && $parts[1] != '*') {
             $ckey = common_mime_type_match($type, $cprefs);
             if ($ckey) {
                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
@@ -2110,7 +2110,7 @@ function common_negotiate_type($cprefs, $sprefs)
 
     foreach (array_keys($cprefs) as $type) {
         $parts = explode('/', $type);
-        if ($parts[1] != '*' && !array_key_exists($type, $sprefs)) {
+        if (isset($parts[1]) && $parts[1] != '*' && !array_key_exists($type, $sprefs)) {
             $skey = common_mime_type_match($type, $sprefs);
             if ($skey) {
                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];