assayer-pro / yii2-sitemap-module

<?php

/**

 * Yii2 module for automatically generating robots.txt.

 *

 * @link https://github.com/himiklab/yii2-sitemap-module

 * @author Serge Larin <[email protected]>

 * @author HimikLab

 * @copyright 2015 Assayer Pro Company

 * @license http://opensource.org/licenses/MIT MIT

 *

 */

namespace assayerpro\sitemap;

use Yii;

use yii\helpers\Url;

/**

 * Yii2 module for automatically generating robots.txt.

 *

 * @author Serge Larin <[email protected]>

 * @package assayerpro\sitemap

 */

class RobotsTxt extends \yii\base\Component

{

    /** @var sting */

    public $host = '';

    /** @var string */

    public $sitemap = '';

    /** @var array */

    public $userAgent = [];

    /**

     * @inheritdoc

     */

    public function init()

    {

        parent::init();

        if (empty($this->host)) {

            if (Yii::$app->request->IsSecureConnection) {

                $this->host = Yii::$app->request->hostInfo;

            } else {

                $this->host = Yii::$app->request->serverName;

            }

        }

    }

    /**

     * render robots.txt

     *

     * @return string

     */

    public function render()

    {

        $result = "";

        $params = [];

        $params['Host'] = $this->host;

        $params['Sitemap'] = $this->sitemap;

        foreach (array_filter($params) as $key => $value) {

            $result .= "$key: $value\n";

        }

        foreach ($this->userAgent as $userAgent => $value) {

            $result .= "User-agent: $userAgent\n";

            foreach ($value as $permission => $urls) {

                foreach ($urls as $url) {

                    $url = Url::to($url);

                    $result .= "$permission: $url\n";

                }

            }

        }

        return $result;

    }

}