From 4e7c5375faae2d181d7f06cf279274a5b58679fa Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
Date: Thu, 2 Oct 2008 00:32:21 +0000
Subject: [PATCH] Error checking for HTTP requests. Props jacobsantos. see
 #7793

git-svn-id: https://develop.svn.wordpress.org/trunk@9051 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-admin/update-links.php |  3 +++
 wp-includes/comment.php   |  5 ++++-
 wp-includes/functions.php | 14 +++++++++++---
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/wp-admin/update-links.php b/wp-admin/update-links.php
index 976769d23f..a60aa6e442 100644
--- a/wp-admin/update-links.php
+++ b/wp-admin/update-links.php
@@ -38,6 +38,9 @@ $options['headers'] = array(
 
 $response = wp_remote_get('http://api.pingomatic.com/updated-batch/', $options);
 
+if ( is_wp_error( $response ) )
+	wp_die(__('Request Failed.'));
+
 if ( $response['response']['code'] != 200 )
 	wp_die(__('Request Failed.'));
 
diff --git a/wp-includes/comment.php b/wp-includes/comment.php
index aa773857c4..a5e3446516 100644
--- a/wp-includes/comment.php
+++ b/wp-includes/comment.php
@@ -1316,7 +1316,10 @@ function trackback($trackback_url, $title, $excerpt, $ID) {
 		'excerpt' => urlencode($excerpt)
 	);
 
-	wp_remote_post($trackback_url, $options);
+	$response = wp_remote_post($trackback_url, $options);
+	
+	if ( is_wp_error( $response ) )
+		return;
 
 	$tb_url = addslashes( $trackback_url );
 	$wpdb->query( $wpdb->prepare("UPDATE $wpdb->posts SET pinged = CONCAT(pinged, '\n', '$tb_url') WHERE ID = %d", $ID) );
diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 3aaa535334..45fae39e0a 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -1039,6 +1039,9 @@ function wp_get_http( $url, $file_path = false, $deprecated = false ) {
 
 	$response = wp_remote_request($url, $options);
 
+	if ( is_wp_error( $response ) )
+		return false;
+
 	$headers = wp_remote_retrieve_headers( $response );
 	if ( false == $file_path )
 		return $headers;
@@ -1072,6 +1075,10 @@ function wp_get_http( $url, $file_path = false, $deprecated = false ) {
  */
 function wp_get_http_headers( $url, $deprecated = false ) {
 	$response = wp_remote_head( $url );
+
+	if ( is_wp_error( $response ) )
+		return false;
+
 	return wp_remote_retrieve_headers( $response );
 }
 
@@ -1240,11 +1247,9 @@ function add_magic_quotes( $array ) {
  * @uses wp_remote_get()
  *
  * @param string $uri URI/URL of web page to retrieve.
- * @return string HTTP content.
+ * @return bool|string HTTP content. False on failure.
  */
 function wp_remote_fopen( $uri ) {
-	// parse url() should not be used for validation of URLs.
-	// Keeping anyway, since the Filter extension is not available on all servers.
 	$parsed_url = @parse_url( $uri );
 
 	if ( !$parsed_url || !is_array( $parsed_url ) )
@@ -1255,6 +1260,9 @@ function wp_remote_fopen( $uri ) {
 
 	$response = wp_remote_get( $uri, $options );
 
+	if ( is_wp_error( $response ) )
+		return false;
+
 	return $response['body'];
 }