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Copyright (C) Villanova University 2020.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2,
as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:17:" * fileDescriptor";N;s:7:" * line";i:0;s:7:" * tags";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:5:{s:8:"category";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:8:"category";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:6:"VuFind";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:7:"package";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:7:"package";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:3:"Net";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:6:"author";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:45:"phpDocumentor\Descriptor\Tag\AuthorDescriptor":3:{s:7:" * name";s:6:"author";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:39:"Demian Katz <demian.katz@villanova.edu>";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:7:"license";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:7:"license";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:69:"http://opensource.org/licenses/gpl-2.0.php GNU General Public License";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:4:"link";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:43:"phpDocumentor\Descriptor\Tag\LinkDescriptor":4:{s:7:" * name";s:4:"link";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:9:"Main Page";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}s:7:" * link";s:18:"https://vufind.org";}}}}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}s:19:" * inheritedElement";N;s:7:" * hash";s:32:"e9f2eedd3366573ab7fb212b8bd3ec42";s:7:" * path";s:38:"VuFind/src/VuFind/Net/UserIpReader.php";s:9:" * source";s:4352:"<?php

/**
 * Service to retrieve user IP address.
 *
 * PHP version 8
 *
 * Copyright (C) Villanova University 2020.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category VuFind
 * @package  Net
 * @author   Demian Katz <demian.katz@villanova.edu>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org Main Page
 */

namespace VuFind\Net;

use Laminas\Stdlib\Parameters;

use function count;

/**
 * Service to retrieve user IP address.
 *
 * @category VuFind
 * @package  Net
 * @author   Demian Katz <demian.katz@villanova.edu>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org Main Page
 */
class UserIpReader
{
    /**
     * Server parameters
     *
     * @var Parameters
     */
    protected $server;

    /**
     * Configuration specifying allowed HTTP headers containing IPs (false for none).
     * See [Proxy] allow_forwarded_ips setting in config.ini for more details.
     *
     * @var string|bool
     */
    protected $allowForwardedIps;

    /**
     * IP addresses to exclude from consideration
     *
     * @var array
     */
    protected $ipFilter;

    /**
     * Constructor
     *
     * @param Parameters  $server            Server parameters
     * @param string|bool $allowForwardedIps Forwarded header configuration string
     * (false to disable checking IP-related X- headers)
     * @param array       $ipFilter          IP addresses to exclude from
     * consideration
     */
    public function __construct(
        Parameters $server,
        $allowForwardedIps = false,
        array $ipFilter = []
    ) {
        $this->server = $server;
        $this->allowForwardedIps = $allowForwardedIps;
        $this->ipFilter = array_map('trim', $ipFilter);
    }

    /**
     * Get the active user's IP address. Returns null if no address can be found.
     *
     * @return string
     */
    public function getUserIp()
    {
        if ($this->allowForwardedIps) {
            foreach (explode(',', $this->allowForwardedIps) as $chunk) {
                // Extract field and behavior from chunk:
                [$field, $behavior] = explode(':', $chunk . ':', 2);

                // Look up field value; skip if empty:
                $fieldValue = $this->server->get($field);
                if (empty($fieldValue)) {
                    continue;
                }

                // Split up the field value, if it is delimited, then filter it:
                $parts = array_diff(
                    array_map('trim', explode(',', $fieldValue)),
                    $this->ipFilter
                );

                // Apply the appropriate behavior (note that we trim any trailing
                // colon off the behavior, since we may have added one above to
                // prevent warnings in the explode operation):
                //
                // Also note that we need to use array_shift/array_pop/current here
                // in place of specific indexes, because the filtering above may have
                // left non-consecutive keys in place.
                $finalBehavior = strtolower(rtrim($behavior, ':'));
                $partCount = count($parts);
                if ($finalBehavior === 'first' && $partCount > 0) {
                    return array_shift($parts);
                } elseif ($finalBehavior === 'last' && $partCount > 0) {
                    return array_pop($parts);
                } elseif ($partCount === 1) {
                    return current($parts);
                }
            }
        }
        // Default case: use REMOTE_ADDR directly.
        return $this->server->get('REMOTE_ADDR');
    }
}
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