Adds HTTP Client Adapter

composer.json

@@ -30,7 +30,8 @@
     "require": {
         "php": ">=7.4",
         "ext-json": "*",
-        "wordpress/php-ai-client": "^0.1"
+        "wordpress/php-ai-client": "^0.2",
+        "nyholm/psr7": "^1.5"
     },
     "require-dev": {
         "automattic/vipwpcs": "^3.0",
@@ -39,7 +40,8 @@
         "phpstan/phpstan": "~2.1",
         "slevomat/coding-standard": "^8.0",
         "squizlabs/php_codesniffer": "^3.7",
-        "wp-coding-standards/wpcs": "^3.0"
+        "wp-coding-standards/wpcs": "^3.0",
+        "szepeviktor/phpstan-wordpress": "^2.0"
     },
     "config": {
         "allow-plugins": {
@@ -58,6 +60,6 @@
         ],
         "phpcs": "phpcs",
         "phpcbf": "phpcbf",
-        "phpstan": "phpstan analyze --memory-limit=256M"
+        "phpstan": "phpstan analyze --memory-limit=512M"
     }
 }

includes/http/WP_AI_Client_Discovery_Strategy.php

@@ -0,0 +1,94 @@
+<?php
+/**
+ * WordPress AI Client Discovery Strategy
+ *
+ * @package WordPress\AI_Client
+ * @since n.e.x.t
+ */
+
+namespace WordPress\AI_Client\HTTP;
+
+use Http\Discovery\Psr18ClientDiscovery;
+use Http\Discovery\Strategy\DiscoveryStrategy;
+use Nyholm\Psr7\Factory\Psr17Factory;
+use Psr\Http\Client\ClientInterface;
+
+/**
+ * Discovery strategy for WordPress HTTP client.
+ *
+ * @since n.e.x.t
+ */
+class WP_AI_Client_Discovery_Strategy implements DiscoveryStrategy {
+
+	/**
+	 * Initialize and register the discovery strategy.
+	 *
+	 * @since n.e.x.t
+	 * @return void
+	 */
+	public static function init() {
+		// Check if discovery is available.
+		if ( ! class_exists( '\Http\Discovery\Psr18ClientDiscovery' ) ) {
+			return;
+		}
+
+		// Register our discovery strategy.
+		Psr18ClientDiscovery::prependStrategy( self::class );
+	}
+
+	/**
+	 * Get candidates for discovery.
+	 *
+	 * @param string $type The type of discovery.
+	 *
+	 * @return array<array<string, mixed>>
+	 */
+	public static function getCandidates( $type ) {
+		// PSR-18 HTTP Client.
+		if ( ClientInterface::class === $type ) {
+			return array(
+				array(
+					'class'     => array( __CLASS__, 'createWordPressClient' ),
+					'condition' => array(
+						WordPress_HTTP_Client::class,
+						Psr17Factory::class,
+					),
+				),
+			);
+		}
+
+		// PSR-17 factories - Nyholm's Psr17Factory implements all of them.
+		$psr17_factories = array(
+			'Psr\Http\Message\RequestFactoryInterface',
+			'Psr\Http\Message\ResponseFactoryInterface',
+			'Psr\Http\Message\ServerRequestFactoryInterface',
+			'Psr\Http\Message\StreamFactoryInterface',
+			'Psr\Http\Message\UploadedFileFactoryInterface',
+			'Psr\Http\Message\UriFactoryInterface',
+		);
+
+		if ( in_array( $type, $psr17_factories, true ) ) {
+			return array(
+				array(
+					'class'     => Psr17Factory::class,
+					'condition' => Psr17Factory::class,
+				),
+			);
+		}
+
+		return array();
+	}
+
+	/**
+	 * Create an instance of the WordPress HTTP client.
+	 *
+	 * @return WordPress_HTTP_Client
+	 */
+	public static function createWordPressClient() {
+		$psr17_factory = new Psr17Factory();
+		return new WordPress_HTTP_Client(
+			$psr17_factory, // Response factory.
+			$psr17_factory  // Stream factory.
+		);
+	}
+}