refactor: use custom imap client

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

lib/Client/Command/StatusResponseParser.php

@@ -0,0 +1,139 @@
+<?php
+
+declare(strict_types=1);
+
+namespace KTXM\ProviderImap\Client\Command;
+
+use KTXM\ProviderImap\Client\ImapException;
+
+final class StatusResponseParser
+{
+    /**
+     * @return array{0: string, 1: array<string, int>}
+     */
+    public function parse(string $payload): array
+    {
+        $payload = trim($payload);
+        $offset = 0;
+
+        $nameToken = $this->readToken($payload, $offset);
+        $statusToken = $this->readToken($payload, $offset);
+
+        if ($nameToken === null || $statusToken === null) {
+            throw new ImapException('Unable to parse STATUS response payload: ' . $payload);
+        }
+
+        $mailbox = $this->decodeAtom($nameToken);
+        if ($mailbox === null || $mailbox === '') {
+            throw new ImapException('STATUS response is missing a mailbox name: ' . $payload);
+        }
+
+        return [$mailbox, $this->parseItems($statusToken, $payload)];
+    }
+
+    /**
+     * @return array<string, int>
+     */
+    private function parseItems(string $statusToken, string $payload): array
+    {
+        $statusToken = trim($statusToken);
+
+        if (!str_starts_with($statusToken, '(') || !str_ends_with($statusToken, ')')) {
+            throw new ImapException('Invalid STATUS data payload: ' . $payload);
+        }
+
+        $items = trim(substr($statusToken, 1, -1));
+        if ($items === '') {
+            return [];
+        }
+
+        $tokens = preg_split('/\s+/', $items) ?: [];
+        if (count($tokens) % 2 !== 0) {
+            throw new ImapException('Malformed STATUS item list: ' . $payload);
+        }
+
+        $status = [];
+
+        for ($index = 0; $index < count($tokens); $index += 2) {
+            $item = strtoupper($tokens[$index]);
+            $value = $tokens[$index + 1];
+
+            if (!preg_match('/^\d+$/', $value)) {
+                throw new ImapException('STATUS item value must be numeric: ' . $payload);
+            }
+
+            $status[$item] = (int) $value;
+        }
+
+        return $status;
+    }
+
+    private function readToken(string $payload, int &$offset): ?string
+    {
+        $length = strlen($payload);
+
+        while ($offset < $length && ctype_space($payload[$offset])) {
+            $offset++;
+        }
+
+        if ($offset >= $length) {
+            return null;
+        }
+
+        if ($payload[$offset] === '(') {
+            $end = strpos($payload, ')', $offset);
+
+            if ($end === false) {
+                throw new ImapException('Unterminated STATUS item block: ' . $payload);
+            }
+
+            $token = substr($payload, $offset, $end - $offset + 1);
+            $offset = $end + 1;
+
+            return $token;
+        }
+
+        if ($payload[$offset] === '"') {
+            $start = $offset;
+            $offset++;
+
+            while ($offset < $length) {
+                if ($payload[$offset] === '\\') {
+                    $offset += 2;
+                    continue;
+                }
+
+                if ($payload[$offset] === '"') {
+                    $offset++;
+                    return substr($payload, $start, $offset - $start);
+                }
+
+                $offset++;
+            }
+
+            throw new ImapException('Unterminated quoted STATUS token: ' . $payload);
+        }
+
+        $start = $offset;
+        while ($offset < $length && !ctype_space($payload[$offset])) {
+            $offset++;
+        }
+
+        return substr($payload, $start, $offset - $start);
+    }
+
+    private function decodeAtom(string $value): ?string
+    {
+        $value = trim($value);
+
+        if (strtoupper($value) === 'NIL') {
+            return null;
+        }
+
+        if (str_starts_with($value, '"') && str_ends_with($value, '"')) {
+            return stripcslashes(substr($value, 1, -1));
+        }
+
+        return $value;
+    }
+}