Fix Messaging for outdated environments

src/Firebase/Factory.php

@@ -406,12 +406,15 @@ public function createMessaging(): Contract\Messaging
         $projectId = $this->getProjectId();
 
         $errorHandler = new MessagingApiExceptionConverter($this->clock);
+        $requestFactory = new Messaging\RequestFactory(
+            requestFactory: $this->httpFactory,
+            streamFactory: $this->httpFactory,
+        );
 
         $messagingApiClient = new Messaging\ApiClient(
             $this->createApiClient(),
             $projectId,
-            $this->httpFactory,
-            $this->httpFactory,
+            $requestFactory,
         );
 
         $appInstanceApiClient = new AppInstanceApiClient(

src/Firebase/Messaging/ApiClient.php

@@ -4,14 +4,11 @@
 
 namespace Kreait\Firebase\Messaging;
 
-use Beste\Json;
 use GuzzleHttp\ClientInterface;
 use GuzzleHttp\Pool;
 use GuzzleHttp\Promise\PromiseInterface;
 use Iterator;
-use Psr\Http\Message\RequestFactoryInterface;
 use Psr\Http\Message\RequestInterface;
-use Psr\Http\Message\StreamFactoryInterface;
 
 /**
  * @internal
@@ -21,34 +18,13 @@
     public function __construct(
         private readonly ClientInterface $client,
         private readonly string $projectId,
-        private readonly RequestFactoryInterface $requestFactory,
-        private readonly StreamFactoryInterface $streamFactory,
+        private readonly RequestFactory $requestFactory,
     ) {
     }
 
     public function createSendRequestForMessage(Message $message, bool $validateOnly): RequestInterface
     {
-        $request = $this->requestFactory
-            ->createRequest(
-                'POST',
-                'https://fcm.googleapis.com/v1/projects/'.$this->projectId.'/messages:send',
-            )
-        ;
-
-        $payload = ['message' => $message];
-
-        if ($validateOnly === true) {
-            $payload['validate_only'] = true;
-        }
-
-        $body = $this->streamFactory->createStream(Json::encode($payload));
-
-        return $request
-            ->withProtocolVersion('2.0')
-            ->withBody($body)
-            ->withHeader('Content-Type', 'application/json; charset=UTF-8')
-            ->withHeader('Content-Length', (string) $body->getSize())
-        ;
+        return $this->requestFactory->createRequest($message, $this->projectId, $validateOnly);
     }
 
     /**

src/Firebase/Messaging/RequestFactory.php

@@ -0,0 +1,74 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kreait\Firebase\Messaging;
+
+use Beste\Json;
+use Psr\Http\Message\RequestFactoryInterface;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\StreamFactoryInterface;
+
+/**
+ * @internal
+ */
+final class RequestFactory
+{
+    private bool $environmentSupportsHTTP2;
+
+    public function __construct(
+        private readonly RequestFactoryInterface $requestFactory,
+        private readonly StreamFactoryInterface $streamFactory,
+    ) {
+        $this->environmentSupportsHTTP2 = self::environmentSupportsHTTP2();
+    }
+
+    public function createRequest(Message $message, string $projectId, bool $validateOnly): RequestInterface
+    {
+        $request = $this->requestFactory
+            ->createRequest(
+                'POST',
+                'https://fcm.googleapis.com/v1/projects/'.$projectId.'/messages:send',
+            )
+        ;
+
+        if ($this->environmentSupportsHTTP2) {
+            $request = $request->withProtocolVersion('2.0');
+        }
+
+        $payload = ['message' => $message];
+
+        if ($validateOnly === true) {
+            $payload['validate_only'] = true;
+        }
+
+        $body = $this->streamFactory->createStream(Json::encode($payload));
+
+        return $request
+            ->withBody($body)
+            ->withHeader('Content-Type', 'application/json; charset=UTF-8')
+            ->withHeader('Content-Length', (string) $body->getSize())
+        ;
+    }
+
+    /**
+     * @see https://github.com/microsoftgraph/msgraph-sdk-php/issues/854
+     * @see https://github.com/microsoftgraph/msgraph-sdk-php/pull/1120
+     *
+     * @codeCoverageIgnore
+     */
+    private static function environmentSupportsHTTP2(): bool
+    {
+        if (!extension_loaded('curl')) {
+            return false;
+        }
+
+        if (!defined('CURL_VERSION_HTTP2')) {
+            return false;
+        }
+
+        $features = curl_version()["features"] ?? null;
+
+        return ($features & CURL_VERSION_HTTP2) === CURL_VERSION_HTTP2;
+    }
+}