feat: add HTTP\Method class

Author: kenjis

system/HTTP/Method.php

@@ -0,0 +1,95 @@
+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <[email protected]>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\HTTP;
+
+/**
+ * HTTP Method List
+ */
+class Method
+{
+    /**
+     * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/CONNECT
+     */
+    public const CONNECT = 'CONNECT';
+
+    /**
+     * Idempotent
+     *
+     * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/DELETE
+     */
+    public const DELETE = 'DELETE';
+
+    /**
+     * Safe, Idempotent, Cacheable
+     *
+     * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/GET
+     */
+    public const GET = 'GET';
+
+    /**
+     * Safe, Idempotent, Cacheable
+     *
+     * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/HEAD
+     */
+    public const HEAD = 'HEAD';
+
+    /**
+     * Safe, Idempotent
+     *
+     * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/OPTIONS
+     */
+    public const OPTIONS = 'OPTIONS';
+
+    /**
+     * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/PATCH
+     */
+    public const PATCH = 'PATCH';
+
+    /**
+     * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST
+     */
+    public const POST = 'POST';
+
+    /**
+     * Idempotent
+     *
+     * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/PUT
+     */
+    public const PUT = 'PUT';
+
+    /**
+     * Safe, Idempotent
+     *
+     * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/TRACE
+     */
+    public const TRACE = 'TRACE';
+
+    /**
+     * Returns all HTTP methods.
+     *
+     * @return list<string>
+     */
+    public static function all(): array
+    {
+        return [
+            self::CONNECT,
+            self::DELETE,
+            self::GET,
+            self::HEAD,
+            self::OPTIONS,
+            self::PATCH,
+            self::POST,
+            self::PUT,
+            self::TRACE,
+        ];
+    }
+}