feat: extend base client for ssl (#243)

src/Client/GRPC/BaseClient.php

@@ -63,21 +63,36 @@ public static function create(string $address): ServiceClientInterface
     /**
      * @param string $address
      * @param string $crt Certificate or cert file in x509 format.
+     * @param string|null $clientKey
+     * @param string|null $clientPem
+     * @param string|null $overrideServerName
      * @return ServiceClientInterface
      *
      * @psalm-suppress UndefinedClass
      * @psalm-suppress UnusedVariable
      */
-    public static function createSSL(string $address, string $crt): ServiceClientInterface
+    public static function createSSL(
+        string $address,
+        string $crt,
+        string $clientKey = null,
+        string $clientPem = null,
+        string $overrideServerName = null
+    ): ServiceClientInterface
     {
-        if (\is_file($crt)) {
-            $crt = \file_get_contents($crt);
+        $options = [
+            'credentials' => \Grpc\ChannelCredentials::createSsl(
+                \is_file($crt) ? \file_get_contents($crt) : null,
+                \is_file($clientKey) ? \file_get_contents($clientKey) : null,
+                \is_file($clientPem) ? \file_get_contents($clientPem) : null
+            )
+        ];
+
+        if ($overrideServerName !== null) {
+            $options['grpc.default_authority'] = $overrideServerName;
+            $options['grpc.ssl_target_name_override'] = $overrideServerName;
         }
 
-        $client = new WorkflowServiceClient(
-            $address,
-            ['credentials' => \Grpc\ChannelCredentials::createSsl($crt)]
-        );
+        $client = new WorkflowServiceClient($address, $options);
 
         return new static($client);
     }