From 4b8a9a5189a625bf99fedec7fd31f6e146410a14 Mon Sep 17 00:00:00 2001
From: emkael <emkael@tlen.pl>
Date: Thu, 26 Apr 2018 01:00:12 +0200
Subject: Update FB API library

---
 lib/facebook-graph-sdk/src/Facebook/polyfills.php | 49 +++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 lib/facebook-graph-sdk/src/Facebook/polyfills.php

(limited to 'lib/facebook-graph-sdk/src/Facebook/polyfills.php')

diff --git a/lib/facebook-graph-sdk/src/Facebook/polyfills.php b/lib/facebook-graph-sdk/src/Facebook/polyfills.php
new file mode 100644
index 0000000..4a67d86
--- /dev/null
+++ b/lib/facebook-graph-sdk/src/Facebook/polyfills.php
@@ -0,0 +1,49 @@
+<?php
+/**
+ * Copyright 2017 Facebook, Inc.
+ *
+ * You are hereby granted a non-exclusive, worldwide, royalty-free license to
+ * use, copy, modify, and distribute this software in source code or binary
+ * form for use in connection with the web services and APIs provided by
+ * Facebook.
+ *
+ * As with any software that integrates with the Facebook platform, your use
+ * of this software is subject to the Facebook Developer Principles and
+ * Policies [http://developers.facebook.com/policy/]. This copyright notice
+ * shall be included in all copies or substantial portions of the software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+/**
+ * @see https://github.com/sarciszewski/php-future/blob/master/src/Security.php#L37-L51
+ */
+if (!function_exists('hash_equals')) {
+    function hash_equals($knownString, $userString)
+    {
+        if (function_exists('mb_strlen')) {
+            $kLen = mb_strlen($knownString, '8bit');
+            $uLen = mb_strlen($userString, '8bit');
+        } else {
+            $kLen = strlen($knownString);
+            $uLen = strlen($userString);
+        }
+        if ($kLen !== $uLen) {
+            return false;
+        }
+        $result = 0;
+        for ($i = 0; $i < $kLen; $i++) {
+            $result |= (ord($knownString[$i]) ^ ord($userString[$i]));
+        }
+
+        // They are only identical strings if $result is exactly 0...
+        return 0 === $result;
+    }
+}
-- 
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