Add upstream

wp-content/plugins/jetpack/_inc/jetpack-server-sandbox.php

@@ -0,0 +1,63 @@
+<?php
+
+/**
+ * This feature is only useful for Automattic developers.
+ * It configures Jetpack to talk to staging/sandbox servers
+ * on WordPress.com instead of production servers.
+ */
+
+/**
+ * @param string $sandbox Sandbox domain
+ * @param string $url URL of request about to be made
+ * @param array  $headers Headers of request about to be made
+ * @return array [ 'url' => new URL, 'host' => new Host ]
+ */
+function jetpack_server_sandbox_request_parameters( $sandbox, $url, $headers ) {
+	$host = '';
+
+	$url_host = parse_url( $url, PHP_URL_HOST );
+
+	switch ( $url_host ) {
+	case 'public-api.wordpress.com' :
+	case 'jetpack.wordpress.com' :
+	case 'jetpack.com' :
+	case 'dashboard.wordpress.com' :
+		$host = isset( $headers['Host'] ) ? $headers['Host'] : $url_host;
+		$url = preg_replace(
+			'@^(https?://)' . preg_quote( $url_host, '@' ) . '(?=[/?#].*|$)@',
+			'\\1' . $sandbox,
+			$url,
+			1
+		);
+	}
+
+	return compact( 'url', 'host' );
+}
+
+/**
+ * Modifies parameters of request in order to send the request to the
+ * server specified by `JETPACK__SANDBOX_DOMAIN`.
+ *
+ * Attached to the `requests-requests.before_request` filter.
+ * @param string &$url URL of request about to be made
+ * @param array  &$headers Headers of request about to be made
+ * @return void
+ */
+function jetpack_server_sandbox( &$url, &$headers ) {
+	if ( ! JETPACK__SANDBOX_DOMAIN ) {
+		return;
+	}
+
+	$original_url = $url;
+
+	$request_parameters = jetpack_server_sandbox_request_parameters( JETPACK__SANDBOX_DOMAIN, $url, $headers );
+	$url = $request_parameters['url'];
+	if ( $request_parameters['host'] ) {
+		$headers['Host'] = $request_parameters['host'];
+		if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) {
+			error_log( sprintf( "SANDBOXING via '%s': '%s'", JETPACK__SANDBOX_DOMAIN, $original_url ) );
+		}
+	}
+}
+
+add_action( 'requests-requests.before_request', 'jetpack_server_sandbox', 10, 2 );