<?php

/**

 * SimplePie

 *

 * A PHP-Based RSS and Atom Feed Framework.

 * Takes the hard work out of managing a complete RSS/Atom solution.

 *

 * Copyright (c) 2004-2022, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without modification, are

 * permitted provided that the following conditions are met:

 *

 * 	* Redistributions of source code must retain the above copyright notice, this list of

 * 	  conditions and the following disclaimer.

 *

 * 	* Redistributions in binary form must reproduce the above copyright notice, this list

 * 	  of conditions and the following disclaimer in the documentation and/or other materials

 * 	  provided with the distribution.

 *

 * 	* Neither the name of the SimplePie Team nor the names of its contributors may be used

 * 	  to endorse or promote products derived from this software without specific prior

 * 	  written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY

 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS

 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * @package SimplePie

 * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue

 * @author Ryan Parman

 * @author Sam Sneddon

 * @author Ryan McCue

 * @link http://simplepie.org/ SimplePie

 * @license http://www.opensource.org/licenses/bsd-license.php BSD License

 */

namespace SimplePie;

/**

 * IRI parser/serialiser/normaliser

 *

 * @package SimplePie

 * @subpackage HTTP

 * @author Sam Sneddon

 * @author Steve Minutillo

 * @author Ryan McCue

 * @copyright 2007-2012 Sam Sneddon, Steve Minutillo, Ryan McCue

 * @license http://www.opensource.org/licenses/bsd-license.php

 */

class IRI

{

    /**

     * Scheme

     *

     * @var string

     */

    protected $scheme = null;

    /**

     * User Information

     *

     * @var string

     */

    protected $iuserinfo = null;

    /**

     * ihost

     *

     * @var string

     */

    protected $ihost = null;

    /**

     * Port

     *

     * @var string

     */

    protected $port = null;

    /**

     * ipath

     *

     * @var string

     */

    protected $ipath = '';

    /**

     * iquery

     *

     * @var string

     */

    protected $iquery = null;

    /**

     * ifragment

     *

     * @var string

     */

    protected $ifragment = null;

    /**

     * Normalization database

     *

     * Each key is the scheme, each value is an array with each key as the IRI

     * part and value as the default value for that part.

     */

    protected $normalization = [

        'acap' => [

            'port' => 674

        ],

        'dict' => [

            'port' => 2628

        ],

        'file' => [

            'ihost' => 'localhost'

        ],

        'http' => [

            'port' => 80,

            'ipath' => '/'

        ],

        'https' => [

            'port' => 443,

            'ipath' => '/'

        ],

    ];

    /**

     * Return the entire IRI when you try and read the object as a string

     *

     * @return string

     */

    public function __toString()

    {

        return $this->get_iri();

    }

    /**

     * Overload __set() to provide access via properties

     *

     * @param string $name Property name

     * @param mixed $value Property value

     */

    public function __set($name, $value)

    {

        if (method_exists($this, 'set_' . $name)) {

            call_user_func([$this, 'set_' . $name], $value);

        } elseif (

            $name === 'iauthority'

            || $name === 'iuserinfo'

            || $name === 'ihost'

            || $name === 'ipath'

            || $name === 'iquery'

            || $name === 'ifragment'

        ) {

            call_user_func([$this, 'set_' . substr($name, 1)], $value);

        }

    }

    /**

     * Overload __get() to provide access via properties

     *

     * @param string $name Property name

     * @return mixed

     */

    public function __get($name)

    {

        // isset() returns false for null, we don't want to do that

        // Also why we use array_key_exists below instead of isset()

        $props = get_object_vars($this);

        if (

            $name === 'iri' ||

            $name === 'uri' ||

            $name === 'iauthority' ||

            $name === 'authority'

        ) {

            $return = $this->{"get_$name"}();

        } elseif (array_key_exists($name, $props)) {

            $return = $this->$name;

        }

        // host -> ihost

        elseif (($prop = 'i' . $name) && array_key_exists($prop, $props)) {

            $name = $prop;

            $return = $this->$prop;

        }

        // ischeme -> scheme

        elseif (($prop = substr($name, 1)) && array_key_exists($prop, $props)) {

            $name = $prop;

            $return = $this->$prop;

        } else {

            trigger_error('Undefined property: ' . get_class($this) . '::' . $name, E_USER_NOTICE);

            $return = null;

        }

        if ($return === null && isset($this->normalization[$this->scheme][$name])) {

            return $this->normalization[$this->scheme][$name];

        }

        return $return;

    }

    /**

     * Overload __isset() to provide access via properties

     *

     * @param string $name Property name

     * @return bool

     */

    public function __isset($name)

    {

        return method_exists($this, 'get_' . $name) || isset($this->$name);

    }

    /**

     * Overload __unset() to provide access via properties

     *

     * @param string $name Property name

     */

    public function __unset($name)

    {

        if (method_exists($this, 'set_' . $name)) {

            call_user_func([$this, 'set_' . $name], '');

        }

    }

    /**

     * Create a new IRI object, from a specified string

     *

     * @param string $iri

     */

    public function __construct($iri = null)

    {

        $this->set_iri($iri);

    }

    /**

     * Clean up

     */

    public function __destruct()

    {

        $this->set_iri(null, true);

        $this->set_path(null, true);

        $this->set_authority(null, true);

    }

    /**

     * Create a new IRI object by resolving a relative IRI

     *

     * Returns false if $base is not absolute, otherwise an IRI.

     *

     * @param IRI|string $base (Absolute) Base IRI

     * @param IRI|string $relative Relative IRI

     * @return IRI|false

     */

    public static function absolutize($base, $relative)

    {

        if (!($relative instanceof IRI)) {

            $relative = new IRI($relative);

        }

        if (!$relative->is_valid()) {

            return false;

        } elseif ($relative->scheme !== null) {

            return clone $relative;

        } else {

            if (!($base instanceof IRI)) {

                $base = new IRI($base);

            }

            if ($base->scheme !== null && $base->is_valid()) {

                if ($relative->get_iri() !== '') {

                    if ($relative->iuserinfo !== null || $relative->ihost !== null || $relative->port !== null) {

                        $target = clone $relative;

                        $target->scheme = $base->scheme;

                    } else {

                        $target = new IRI();

                        $target->scheme = $base->scheme;

                        $target->iuserinfo = $base->iuserinfo;

                        $target->ihost = $base->ihost;

                        $target->port = $base->port;

                        if ($relative->ipath !== '') {

                            if ($relative->ipath[0] === '/') {

                                $target->ipath = $relative->ipath;

                            } elseif (($base->iuserinfo !== null || $base->ihost !== null || $base->port !== null) && $base->ipath === '') {

                                $target->ipath = '/' . $relative->ipath;

                            } elseif (($last_segment = strrpos($base->ipath, '/')) !== false) {

                                $target->ipath = substr($base->ipath, 0, $last_segment + 1) . $relative->ipath;

                            } else {

                                $target->ipath = $relative->ipath;

                            }

                            $target->ipath = $target->remove_dot_segments($target->ipath);

                            $target->iquery = $relative->iquery;

                        } else {

                            $target->ipath = $base->ipath;

                            if ($relative->iquery !== null) {

                                $target->iquery = $relative->iquery;

                            } elseif ($base->iquery !== null) {

                                $target->iquery = $base->iquery;

                            }

                        }

                        $target->ifragment = $relative->ifragment;

                    }

                } else {

                    $target = clone $base;

                    $target->ifragment = null;

                }

                $target->scheme_normalization();

                return $target;

            }

            return false;

        }

    }

    /**

     * Parse an IRI into scheme/authority/path/query/fragment segments

     *

     * @param string $iri

     * @return array

     */

    protected function parse_iri($iri)

    {

        $iri = trim($iri, "\x20\x09\x0A\x0C\x0D");

        if (preg_match('/^((?P<scheme>[^:\/?#]+):)?(\/\/(?P<authority>[^\/?#]*))?(?P<path>[^?#]*)(\?(?P<query>[^#]*))?(#(?P<fragment>.*))?$/', $iri, $match)) {

            if ($match[1] === '') {

                $match['scheme'] = null;

            }

            if (!isset($match[3]) || $match[3] === '') {

                $match['authority'] = null;

            }

            if (!isset($match[5])) {

                $match['path'] = '';

            }

            if (!isset($match[6]) || $match[6] === '') {

                $match['query'] = null;

            }

            if (!isset($match[8]) || $match[8] === '') {

                $match['fragment'] = null;

            }

            return $match;

        }

        // This can occur when a paragraph is accidentally parsed as a URI

        return false;

    }

    /**

     * Remove dot segments from a path

     *

     * @param string $input

     * @return string

     */

    protected function remove_dot_segments($input)

    {

        $output = '';

        while (strpos($input, './') !== false || strpos($input, '/.') !== false || $input === '.' || $input === '..') {

            // A: If the input buffer begins with a prefix of "../" or "./", then remove that prefix from the input buffer; otherwise,

            if (strpos($input, '../') === 0) {

                $input = substr($input, 3);

            } elseif (strpos($input, './') === 0) {

                $input = substr($input, 2);

            }

            // B: if the input buffer begins with a prefix of "/./" or "/.", where "." is a complete path segment, then replace that prefix with "/" in the input buffer; otherwise,

            elseif (strpos($input, '/./') === 0) {

                $input = substr($input, 2);

            } elseif ($input === '/.') {

                $input = '/';

            }

            // C: if the input buffer begins with a prefix of "/../" or "/..", where ".." is a complete path segment, then replace that prefix with "/" in the input buffer and remove the last segment and its preceding "/" (if any) from the output buffer; otherwise,

            elseif (strpos($input, '/../') === 0) {

                $input = substr($input, 3);

                $output = substr_replace($output, '', intval(strrpos($output, '/')));

            } elseif ($input === '/..') {

                $input = '/';

                $output = substr_replace($output, '', intval(strrpos($output, '/')));

            }

            // D: if the input buffer consists only of "." or "..", then remove that from the input buffer; otherwise,

            elseif ($input === '.' || $input === '..') {

                $input = '';

            }

            // E: move the first path segment in the input buffer to the end of the output buffer, including the initial "/" character (if any) and any subsequent characters up to, but not including, the next "/" character or the end of the input buffer

            elseif (($pos = strpos($input, '/', 1)) !== false) {

                $output .= substr($input, 0, $pos);

                $input = substr_replace($input, '', 0, $pos);

            } else {

                $output .= $input;

                $input = '';

            }

        }

        return $output . $input;

    }

    /**

     * Replace invalid character with percent encoding

     *

     * @param string $string Input string

     * @param string $extra_chars Valid characters not in iunreserved or

     *                            iprivate (this is ASCII-only)

     * @param bool $iprivate Allow iprivate

     * @return string

     */

    protected function replace_invalid_with_pct_encoding($string, $extra_chars, $iprivate = false)

    {

        // Normalize as many pct-encoded sections as possible

        $string = preg_replace_callback('/(?:%[A-Fa-f0-9]{2})+/', [$this, 'remove_iunreserved_percent_encoded'], $string);

        // Replace invalid percent characters

        $string = preg_replace('/%(?![A-Fa-f0-9]{2})/', '%25', $string);

        // Add unreserved and % to $extra_chars (the latter is safe because all

        // pct-encoded sections are now valid).

        $extra_chars .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~%';

        // Now replace any bytes that aren't allowed with their pct-encoded versions

        $position = 0;

        $strlen = strlen($string);

        while (($position += strspn($string, $extra_chars, $position)) < $strlen) {

            $value = ord($string[$position]);

            $character = 0;

            // Start position

            $start = $position;

            // By default we are valid