feat: initial version

Signed-off-by: Sebastian Krupinski <root@LAPTOP-7DVOR6NC>

lib/Client/Protocol/Imap.php

@@ -0,0 +1,129 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Gricob\IMAP\Protocol;
+
+use Generator;
+use Gricob\IMAP\Protocol\Command\Command;
+use Gricob\IMAP\Protocol\Command\StartTlsCommand;
+use Gricob\IMAP\Protocol\Response\Line\Line;
+use Gricob\IMAP\Protocol\Response\Line\Status\Status;
+use Gricob\IMAP\Protocol\Response\Line\Status\StatusType;
+use Gricob\IMAP\Protocol\Response\Parser\Parser;
+use Gricob\IMAP\Protocol\Response\Response;
+use Gricob\IMAP\Transport\Connection;
+use RuntimeException;
+
+class Imap
+{
+    protected Connection $connection;
+    private TagGenerator $tagGenerator;
+    private ResponseHandler $responseHandler;
+
+    public function __construct(Connection $connection)
+    {
+        $this->connection = $connection;
+        $this->tagGenerator = new TagGenerator();
+        $this->responseHandler = new ResponseHandler(new Parser());
+    }
+
+    public function __destruct()
+    {
+        $this->disconnect();
+    }
+
+    public function connect(): void
+    {
+        if ($this->connection->isOpen()) {
+            return;
+        }
+
+        $this->connection->open();
+
+        $responseStream = $this->connection->receive();
+
+        $greeting = $this->responseHandler->handle('*', $responseStream, new UnexpectedContinuationHandler());
+
+        match ($greeting->status->type) {
+            StatusType::OK => null, // Do nothing
+            StatusType::PREAUTH => throw new RuntimeException('pre-auth is not supported'),
+            StatusType::BAD,
+            StatusType::NO,
+            StatusType::BYE => throw new ConnectionRejected($greeting->status->message),
+        };
+    }
+
+    public function disconnect(): void
+    {
+        $this->connection->close();
+    }
+
+    /**
+     * Perform STARTTLS negotiation (patch).
+     *
+     * Sends the STARTTLS command and upgrades the underlying socket to TLS.
+     * The connection must be a SocketConnection (or any Connection that
+     * implements upgradeTls()).  Call this after connect() but before logIn().
+     *
+     * @throws \RuntimeException if the server rejects STARTTLS
+     * @throws \BadMethodCallException if the connection does not support TLS upgrade
+     */
+    public function startTls(): void
+    {
+        if (!method_exists($this->connection, 'upgradeTls')) {
+            throw new \BadMethodCallException(
+                'The current Connection implementation does not support STARTTLS upgrade'
+            );
+        }
+
+        $response = $this->send(new StartTlsCommand());
+
+        if ($response->status->type !== StatusType::OK) {
+            throw new \RuntimeException(
+                'Server rejected STARTTLS: ' . $response->status->message
+            );
+        }
+
+        $this->connection->upgradeTls();
+    }
+
+    public function send(Command $command): Response
+    {
+        $interaction = new CommandInteraction(
+            $this->connection,
+            $this->responseHandler,
+            $this->tagGenerator->next(),
+            $command,
+        );
+
+        $response = $interaction->interact();
+
+        if ($response->status->type != StatusType::OK) {
+            throw CommandFailed::withStatus($response->status);
+        }
+
+        return $response;
+    }
+
+    /**
+     * Sends $command and returns a Generator that yields each untagged Line as
+     * it arrives from the socket.  CommandFailed is thrown (inside the generator)
+     * if the server responds with NO or BAD.
+     *
+     * @return Generator<int, Line, mixed, Status>
+     */
+    public function sendStreaming(Command $command): Generator
+    {
+        $this->connect();
+
+        $interaction = new CommandInteraction(
+            $this->connection,
+            $this->responseHandler,
+            $this->tagGenerator->next(),
+            $command,
+        );
+
+        yield from $interaction->streamInteract();
+    }
+}