From aee50eb2bf5074eea9bf3d28fa77c988040e659d Mon Sep 17 00:00:00 2001
From: nicolaasuni <info@tecnick.com>
Date: Sat, 22 Sep 2018 12:50:04 +0100
Subject: [PATCH] Support remote files in file_exists

---
 CHANGELOG.TXT            |  3 +++
 composer.json            |  2 +-
 include/tcpdf_static.php | 37 +++++++++++++++++++++++++++++++++----
 tcpdf.php                |  6 +++---
 4 files changed, 40 insertions(+), 8 deletions(-)

diff --git a/CHANGELOG.TXT b/CHANGELOG.TXT
index 5843efb..fa6a7a6 100644
--- a/CHANGELOG.TXT
+++ b/CHANGELOG.TXT
@@ -1,3 +1,6 @@
+6.2.24
+	- Support remote urls when checking if file exists.
+
 6.2.23
 	- Simplify file_exists function.
 
diff --git a/composer.json b/composer.json
index bff3133..9994468 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
   "name": "tecnickcom/tcpdf",
-  "version": "6.2.23",
+  "version": "6.2.24",
   "homepage": "http://www.tcpdf.org/",
   "type": "library",
   "description": "TCPDF is a PHP class for generating PDF documents and barcodes.",
diff --git a/include/tcpdf_static.php b/include/tcpdf_static.php
index 3e24597..37701d9 100644
--- a/include/tcpdf_static.php
+++ b/include/tcpdf_static.php
@@ -55,7 +55,7 @@ class TCPDF_STATIC {
 	 * Current TCPDF version.
 	 * @private static
 	 */
-	private static $tcpdf_version = '6.2.23';
+	private static $tcpdf_version = '6.2.24';
 
 	/**
 	 * String alias for total number of pages.
@@ -1821,6 +1821,31 @@ class TCPDF_STATIC {
 		return fopen($filename, $mode);
 	}
 
+	/**
+	 * Check if the URL exist.
+	 * @param url (string) URL to check.
+	 * @return Returns TRUE if the URL exists; FALSE otherwise.
+	 * @public static
+	 */
+	public static function url_exists($url) {
+		$crs = curl_init();
+		curl_setopt($crs, CURLOPT_URL, $url);
+		curl_setopt($crs, CURLOPT_NOBODY, true);
+		curl_setopt($crs, CURLOPT_FAILONERROR, true);
+		if ((ini_get('open_basedir') == '') && (!ini_get('safe_mode'))) {
+			curl_setopt($crs, CURLOPT_FOLLOWLOCATION, true);
+		}
+		curl_setopt($crs, CURLOPT_CONNECTTIMEOUT, 5);
+		curl_setopt($crs, CURLOPT_TIMEOUT, 30);
+		curl_setopt($crs, CURLOPT_SSL_VERIFYPEER, false);
+		curl_setopt($crs, CURLOPT_SSL_VERIFYHOST, false);
+		curl_setopt($crs, CURLOPT_USERAGENT, 'tc-lib-file');
+		curl_exec($crs);
+		$code = curl_getinfo($crs, CURLINFO_HTTP_CODE);
+		curl_close($crs);
+		return ($code == 200);
+	}
+
 	/**
 	 * Wrapper for file_exists.
 	 * Checks whether a file or directory exists.
@@ -1830,10 +1855,14 @@ class TCPDF_STATIC {
 	 * @public static
 	 */
 	public static function file_exists($filename) {
-		if (strpos($filename, '://') && (preg_match('|^https?://|', $filename) !== 1)) {
-			return false;
+		$httpmode = (preg_match('|^https?://|', $filename) == 1);
+		if (!$httpmode && strpos($filename, '://')) {
+			return false; // only support http and https wrappers for security reasons
 		}
-		return @file_exists($filename);
+		if (@file_exists($filename) || ($httpmode && self::url_exists($filename))) {
+			return true;
+		}
+		return false;
 	}
 
 	/**
diff --git a/tcpdf.php b/tcpdf.php
index b89701e..f0f223f 100644
--- a/tcpdf.php
+++ b/tcpdf.php
@@ -1,7 +1,7 @@
 <?php
 //============================================================+
 // File name   : tcpdf.php
-// Version     : 6.2.23
+// Version     : 6.2.24
 // Begin       : 2002-08-03
 // Last Update : 2018-09-14
 // Author      : Nicola Asuni - Tecnick.com LTD - www.tecnick.com - info@tecnick.com
@@ -104,7 +104,7 @@
  * Tools to encode your unicode fonts are on fonts/utils directory.</p>
  * @package com.tecnick.tcpdf
  * @author Nicola Asuni
- * @version 6.2.23
+ * @version 6.2.24
  */
 
 // TCPDF configuration
@@ -128,7 +128,7 @@ require_once(dirname(__FILE__).'/include/tcpdf_static.php');
  * TCPDF project (http://www.tcpdf.org) has been originally derived in 2002 from the Public Domain FPDF class by Olivier Plathey (http://www.fpdf.org), but now is almost entirely rewritten.<br>
  * @package com.tecnick.tcpdf
  * @brief PHP class for generating PDF documents without requiring external extensions.
- * @version 6.2.23
+ * @version 6.2.24
  * @author Nicola Asuni - info@tecnick.com
  * @IgnoreAnnotation("protected")
  * @IgnoreAnnotation("public")