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<?php
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/**
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* This file is part of the Shieldon package.
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*
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* (c) Terry L. <contact@terryl.in>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*
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* php version 7.1.0
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*
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* @category Web-security
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* @package Shieldon
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* @author Terry Lin <contact@terryl.in>
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* @copyright 2019 terrylinooo
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* @license https://github.com/terrylinooo/shieldon/blob/2.x/LICENSE MIT
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* @link https://github.com/terrylinooo/shieldon
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* @see https://shieldon.io
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*/
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declare(strict_types=1);
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namespace Shieldon\Firewall\Component;
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use Shieldon\Firewall\Component\ComponentProvider;
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use Shieldon\Firewall\Component\DeniedTrait;
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use Shieldon\Firewall\IpTrait;
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use function Shieldon\Firewall\get_request;
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/**
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* Header component.
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*/
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class Header extends ComponentProvider
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{
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/**
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* Public methods | Desctiotion
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* ----------------------|---------------------------------------------
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* setIp | Set an IP address.
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* getIp | Get current set IP.
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* setRdns | Set a RDNS record for the check.
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* getRdns | Get IP resolved hostname.
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* ----------------------|---------------------------------------------
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*/
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use IpTrait;
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/**
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* Public methods | Desctiotion
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* ----------------------|---------------------------------------------
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* setDeniedItems | Add items to the blacklist pool.
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* setDeniedItem | Add an item to the blacklist pool.
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* getDeniedItems | Get items from the blacklist pool.
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* getDeniedItem | Get items from the blacklist pool.
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* removeDeniedItem | Remove a denied item if exists.
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* removeDeniedItems | Remove all denied items.
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* hasDeniedItem | Check if a denied item exists.
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* getDenyWithPrefix | Check if a denied item exists have the same prefix.
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* removeDenyWithPrefix | Remove denied items with the same prefix.
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* isDenied | Check if an item is denied?
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* ----------------------|---------------------------------------------
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*/
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use DeniedTrait;
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/**
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* Constant
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*/
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const STATUS_CODE = 83;
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/**
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* Very common requests from normal users.
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*
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* @var array
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*/
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protected $commonHeaderFileds = [
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'Accept',
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'Accept-Language',
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'Accept-Encoding',
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];
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/**
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* Header information.
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*
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* @var array
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*/
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protected $headers = [];
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/**
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* Header component constructor.
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*/
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public function __construct()
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{
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$this->headers = get_request()->getHeaders();
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$this->deniedList = [];
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}
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/**
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* {@inheritDoc}
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*
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* @return bool
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*/
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public function isDenied(): bool
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{
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if (!empty($this->deniedList)) {
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$intersect = array_intersect_key($this->deniedList, $this->headers);
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foreach ($intersect as $headerName => $headerValue) {
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$requestHeader = get_request()->getHeaderLine($headerName);
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// When found a header field contains a prohibited string.
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if (stripos($requestHeader, $headerValue) !== false) {
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return true;
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}
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}
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}
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if ($this->strictMode) {
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foreach ($this->commonHeaderFileds as $fieldName) {
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// If strict mode is on, this value must be found.
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if (!isset($this->headers[$fieldName]) && empty($this->headers['referer'])) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* All request headers.
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*
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* @return array
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*/
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public function getHeaders(): array
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{
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return $this->headers;
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}
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/**
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* Unique deny status code.
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*
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* @return int
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*/
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public function getDenyStatusCode(): int
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{
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return self::STATUS_CODE;
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}
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}
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terrylinooo