From 2684a17e83e867eb88c147a412b1cde186473053 Mon Sep 17 00:00:00 2001
From: Russell Heimlich <kingkool68@gmail.com>
Date: Sat, 9 May 2020 23:52:39 -0400
Subject: [PATCH]

---
 use-remote-media.php | 62 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 use-remote-media.php

diff --git a/use-remote-media.php b/use-remote-media.php
new file mode 100644
index 0000000..5bd941f
--- /dev/null
+++ b/use-remote-media.php
@@ -0,0 +1,62 @@
+<?php
+// Put this in wp-config.php and replace https://example.com/ with the URL of the production site.
+define( 'RH_USE_REMOTE_MEDIA_URL', 'https://example.com/' );
+
+// Put the rest of this in functions.php or a custom plugin or somewhere else.
+if ( defined( 'RH_USE_REMOTE_MEDIA_URL' ) && ! empty( RH_USE_REMOTE_MEDIA_URL ) ) {
+	add_filter( 'wp_get_attachment_image_src', array( $this, 'filter_wp_get_attachment_image_src' ) );
+	add_filter( 'wp_calculate_image_srcset', array( $this, 'filter_wp_calculate_image_srcset' ) );
+	add_filter( 'wp_get_attachment_url', array( $this, 'filter_wp_get_attachment_url' ) );
+}
+
+function filter_wp_get_attachment_image_src( $image = array() ) {
+	if ( ! is_array( $image ) || empty( $image ) ) {
+		return $image;
+	}
+	$wp_upload_dir = wp_upload_dir();
+	$base_dir      = $wp_upload_dir['basedir'];
+	$base_url      = $wp_upload_dir['baseurl'];
+	$absolute_path = str_replace( $base_url, $base_dir, $image[0] );
+	if ( file_exists( $absolute_path ) ) {
+		return $image;
+	}
+	$find     = get_site_url();
+	$replace  = RH_USE_REMOTE_MEDIA_URL;
+	$image[0] = str_replace( $find, $replace, $image[0] );
+	return $image;
+}
+
+function filter_wp_calculate_image_srcset( $src = array() ) {
+	if ( is_array( $src ) && ! is_admin() ) {
+		$wp_upload_dir = wp_upload_dir();
+		$base_dir      = $wp_upload_dir['basedir'];
+		$base_url      = $wp_upload_dir['baseurl'];
+		$find          = get_site_url();
+		$replace       = RH_USE_REMOTE_MEDIA_URL;
+		foreach ( $src as $key => $val ) {
+			$absolute_path = str_replace( $base_url, $base_dir, $val['url'] );
+			if ( ! file_exists( $absolute_path ) ) {
+				$val['url']  = str_replace( $find, $replace, $val['url'] );
+				$src[ $key ] = $val;
+			}
+		}
+	}
+	return $src;
+}
+
+function filter_wp_get_attachment_url( $url = '' ) {
+	if ( is_admin() ) {
+		return $url;
+	}
+
+	$wp_upload_dir = wp_upload_dir();
+	$base_dir      = $wp_upload_dir['basedir'];
+	$base_url      = $wp_upload_dir['baseurl'];
+	$find          = get_site_url();
+	$replace       = RH_USE_REMOTE_MEDIA_URL;
+	$absolute_path = str_replace( $base_url, $base_dir, $url );
+	if ( ! file_exists( $absolute_path ) ) {
+		$url = str_replace( $find, $replace, $url );
+	}
+	return $url;
+}