refactor: use custom imap client

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

lib/Client/Command/StartTlsCommand.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace KTXM\ProviderImap\Client\Command;
+
+use KTXM\ProviderImap\Client\Command\Result\CommandStatusResult;
+use KTXM\ProviderImap\Client\ImapException;
+use KTXM\ProviderImap\Client\Protocol\RequestFrame;
+use KTXM\ProviderImap\Client\Protocol\Response\TaggedResponse;
+use KTXM\ProviderImap\Client\Protocol\ResponseStream;
+use KTXM\ProviderImap\Client\SessionContext;
+use KTXM\ProviderImap\Client\SessionState;
+
+/**
+ * @implements CommandInterface<CommandStatusResult>
+ */
+final class StartTlsCommand implements CommandInterface
+{
+    public function name(): string
+    {
+        return 'STARTTLS';
+    }
+
+    public function allowedStates(): array
+    {
+        return [SessionState::NotAuthenticated];
+    }
+
+    public function encode(string $tag, SessionContext $context): RequestFrame
+    {
+        unset($tag, $context);
+
+        return new RequestFrame('STARTTLS');
+    }
+
+    public function handle(ResponseStream $responses, SessionContext $context): CommandStatusResult
+    {
+        foreach ($responses as $response) {
+            if ($response instanceof TaggedResponse) {
+                if (!$response->isOk()) {
+                    throw new ImapException('STARTTLS failed: ' . $response->text());
+                }
+
+                $context->connection()->upgradeToTls();
+                $context->replaceCapabilities();
+
+                return new CommandStatusResult($response->status(), $response->text());
+            }
+        }
+
+        throw new ImapException('STARTTLS did not receive a tagged completion response.');
+    }
+}