Fix: Networking broken when extra PHP extensions are enabled

The recent [removal of custom WordPress
patches](#1004)
broke the networking feature when the extra PHP extensions are enabled.
It removed the default networking tranports via the http_api_transports
filter, but it did not account for WordPress trying to use the Fetch and
Fsockopen transports anyway whenever their `::test()` method returns
true – which it does when the OpenSSL extension is available.

This PR uses the reflections API to force-replace the
Requests::$transports array with one containing exclusively the Fetch
transport.

Open Playground, enable PHP extensions and networking, go to WP Admin >
Plugins > Add, confirm the list of plugins is visible

CC @bgrgicak @annezazu

packages/playground/remote/src/lib/playground-mu-plugin/0-playground.php

@@ -141,6 +141,18 @@ function networking_disabled() {
 $__requests_class = class_exists( '\WpOrg\Requests\Requests' ) ? '\WpOrg\Requests\Requests' : 'Requests';
 if (defined('USE_FETCH_FOR_REQUESTS') && USE_FETCH_FOR_REQUESTS) {
 	require(__DIR__ . '/playground-includes/wp_http_fetch.php');
+	// Force-replace the default WordPress requests transports with the Fetch transport.
+	// 
+	// WordPress doesn't provide a way to change the default transports,
+	// that is Curl and FSockopen. Even with all the `http_api_tranports`
+	// filter used below, WordPress tests if they are supported and will
+	// use them if their `::test()` method returns true – which it does
+	// when PHP.wasm runs with the openssl extension loaded.
+	$reflection = new ReflectionClass($__requests_class);
+	$property = $reflection->getProperty('transports');
+	$property->setAccessible(true);
+	$property->setValue(['Fetch' => 'Wp_Http_Fetch']);
+
 	$__requests_class::add_transport('Wp_Http_Fetch');
 
 	/**
@@ -164,9 +176,10 @@ function networking_disabled() {
 		return [];
 	});
 
-	add_filter('http_request_host_is_external', function ($arg) {
-		return true;
-	});
+	// add_filter('http_request_host_is_external', function ($arg) {
+	// 	return true;
+	// });
+	add_filter('http_request_host_is_external', '__return_true');
 } else {
 	require(__DIR__ . '/playground-includes/wp_http_dummy.php');
 	$__requests_class::add_transport('Wp_Http_Dummy');

packages/playground/website/cypress/e2e/query-api.cy.ts

@@ -69,6 +69,15 @@ describe('Query API', () => {
 				.should('have.length.above', 4);
 		});
 
+		it('should enable networking when requested AND the kitchen sink extension bundle is enabled', () => {
+			cy.visit(
+				'/?php-extension-bundle=kitchen-sink&networking=yes&url=/wp-admin/plugin-install.php'
+			);
+			cy.wordPressDocument()
+				.find('.plugin-card')
+				.should('have.length.above', 4);
+		});
+
 		/**
 		 * @see https://github.com/WordPress/wordpress-playground/pull/819
 		 * @TODO: Turn this into a unit test once WordPress modules are available