Initial EV files

system/HTTP/RequestInterface.php

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+<?php
+
+/**
+ * This file is part of the CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\HTTP;
+
+/**
+ * Expected behavior of an HTTP request
+ *
+ * @mixin IncomingRequest
+ * @mixin CLIRequest
+ * @mixin CURLRequest
+ */
+interface RequestInterface
+{
+	/**
+	 * Gets the user's IP address.
+	 * Supplied by RequestTrait.
+	 *
+	 * @return string IP address
+	 */
+	public function getIPAddress(): string;
+
+	//--------------------------------------------------------------------
+
+	/**
+	 * Validate an IP address
+	 *
+	 * @param string $ip    IP Address
+	 * @param string $which IP protocol: 'ipv4' or 'ipv6'
+	 *
+	 * @return boolean
+	 *
+	 * @deprecated Use Validation instead
+	 */
+	public function isValidIP(string $ip, string $which = null): bool;
+
+	//--------------------------------------------------------------------
+
+	/**
+	 * Get the request method.
+	 * An extension of PSR-7's getMethod to allow casing.
+	 *
+	 * @param boolean $upper Whether to return in upper or lower case.
+	 *
+	 * @return string
+	 *
+	 * @deprecated The $upper functionality will be removed and this will revert to its PSR-7 equivalent
+	 */
+	public function getMethod(bool $upper = false): string;
+
+	//--------------------------------------------------------------------
+
+	/**
+	 * Fetch an item from the $_SERVER array.
+	 * Supplied by RequestTrait.
+	 *
+	 * @param  string $index  Index for item to be fetched from $_SERVER
+	 * @param  null   $filter A filter name to be applied
+	 * @return mixed
+	 */
+	public function getServer($index = null, $filter = null);
+
+	//--------------------------------------------------------------------
+}