<?php

/**
 * IRI parser/serialiser/normaliser
 *
 * @package Requests\Utilities
 */

namespace WpOrg\Requests;

use WpOrg\Requests\Exception\InvalidArgument;
use WpOrg\Requests\Utility\InputValidator;

/**
 * IRI parser/serialiser/normaliser
 *
 * Copyright (c) 2007-2010, Geoffrey Sneddon and Steve Minutillo.
 * 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 Requests\Utilities
 * @author Geoffrey Sneddon
 * @author Steve Minutillo
 * @copyright 2007-2009 Geoffrey Sneddon and Steve Minutillo
 * @license https://opensource.org/licenses/bsd-license.php
 * @link http://hg.gsnedders.com/iri/
 *
 * @property string $iri IRI we're working with
 * @property-read string $uri IRI in URI form, {@see \WpOrg\Requests\Iri::to_uri()}
 * @property string $scheme Scheme part of the IRI
 * @property string $authority Authority part, formatted for a URI (userinfo + host + port)
 * @property string $iauthority Authority part of the IRI (userinfo + host + port)
 * @property string $userinfo Userinfo part, formatted for a URI (after '://' and before '@')
 * @property string $iuserinfo Userinfo part of the IRI (after '://' and before '@')
 * @property string $host Host part, formatted for a URI
 * @property string $ihost Host part of the IRI
 * @property string $port Port part of the IRI (after ':')
 * @property string $path Path part, formatted for a URI (after first '/')
 * @property string $ipath Path part of the IRI (after first '/')
 * @property string $query Query part, formatted for a URI (after '?')
 * @property string $iquery Query part of the IRI (after '?')
 * @property string $fragment Fragment, formatted for a URI (after '#')
 * @property string $ifragment Fragment part of the IRI (after '#')
 */
class Iri
{
    /**
     * Scheme
     *
     * @var string|null
     */
    protected $scheme = null;

    /**
     * User Information
     *
     * @var string|null
     */
    protected $iuserinfo = null;

    /**
     * ihost
     *
     * @var string|null
     */
    protected $ihost = null;

    /**
     * Port
     *
     * @var string|null
     */
    protected $port = null;

    /**
     * ipath
     *
     * @var string
     */
    protected $ipath = '';

    /**
     * iquery
     *
     * @var string|null
     */
    protected $iquery = null;

    /**
     * ifragment|null
     *
     * @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.
     *
     * @var array
     */
    protected $normalization = [
        'acap' => [
            'port' => Port::ACAP,
        ],
        'dict' => [
            'port' => Port::DICT,
        ],
        'file' => [
            'ihost' => 'localhost',
        ],
        'http' => [
            'port' => Port::HTTP,
        ],
        'https' => [
            'port' => Port::HTTPS,
        ],
    ];

    /**
     * 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'
        ) {
            $method = 'get_' . $name;
            $return = $this->$method();
        } 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];
        } else {
            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|Stringable|null $iri
     *
     * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $iri argument is not a string, Stringable or null.
     */
    public function __construct($iri = null)
    {
        if ($iri != null && InputValidator::is_string_or_stringable($iri) == false) {
            throw InvalidArgument::create(1, '$iri', 'string|Stringable|null', gettype($iri));
        }

        $this->set_iri($iri);
    }

    /**
     * Create a new IRI object by resolving a relative IRI
     *
     * Returns false if $base is not absolute, otherwise an IRI.
     *
     * @param \WpOrg\Requests\Iri|string $base (Absolute) Base IRI
     * @param \WpOrg\Requests\Iri|string $relative Relative IRI
     * @return \WpOrg\Requests\Iri|false
     */
    public static function absolutize($base, $relative)
    {
        if (!($relative instanceof self)) {
            $relative = new self($relative);
        }

        if (!$relative->is_valid()) {
            return false;
        } elseif ($relative->scheme != null) {
            return clone $relative;
        }

        if (!($base instanceof self)) {
            $base = new self($base);
        }

        if ($base->scheme == null || !$base->is_valid()) {
            return false;
        }

        if ($relative->get_iri() != '') {
            if ($relative->iuserinfo != null || $relative->ihost != null || $relative->port != null) {
                $target         = clone $relative;
                $target->scheme = $base->scheme;
            } else {
                $target            = new self();
                $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;
    }

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

        if (!$has_match) {
            throw new Exception('Cannot parse supplied IRI', 'iri.cannot_parse', $iri);
        }

        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;
    }

    /**
     * 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, '', strrpos($output, '/'));
            } elseif ($input == '/..') {
                $input  = '/';
                $output = substr_replace($output, '', 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 $text Input string
     * @param string $extra_chars Valid characters not in iunreserved or
     *                            iprivate (this is ASCII-only)
     * @param bool $iprivate Allow iprivate
     * @return string
     */
    protected function replace_invalid_with_pct_encoding($text, $extra_chars, $iprivate = false)
    {
        // Normalize as many pct-encoded sections as possible
        $text = preg_replace_callback('/(?:%[A-Fa-f0-9]{2})+/', [$this, 'remove_iunreserved_percent_encoded'], $text);

        // Replace invalid percent characters
        $text = preg_replace('/%(?![A-Fa-f0-9]{2})/', '%25', $text);

        // 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;
        $strlen   = strlen($text);
        while (($position += strspn($text, $extra_chars, $position)) < $strlen) {
            $value = ord($text[$position]);

            // Start position
            $start = $position;

            // By default we are valid
            $valid = true;

            // No one byte sequences are valid due to the while.
            // Two byte sequence:
            if (($value & 0xE0) == 0xC0) {
                $character = ($value & 0x1F) << 6;
                $length    = 2;
                $remaining = 1;
            }
            // Three byte sequence:
            elseif (($value & 0xF0) == 0xE0) {
                $character = ($value & 0x0F) << 12;
                $length    = 3;
                $remaining = 2;
            }
            // Four byte sequence:
            elseif (($value & 0xF8) == 0xF0) {
                $character = ($value & 0x07) << 18;
                $length    = 4;
                $remaining = 3;
            }
            // Invalid byte:
            else {
                $valid     = false;
                $length    = 1;
                $remaining = 0;
            }

            if ($remaining) {
                if ($position + $length <= $strlen) {
                    for ($position++; $remaining; $position++) {
                        $value = ord($text[$position]);

                        // Check that the byte is valid, then add it to the character:
                        if (($value & 0xC0) == 0x80) {
                            $character |= ($value & 0x3F) << (--$remaining * 6);
                        }
                        // If it is invalid, count the sequence as invalid and reprocess the current byte:
                        else {
                            $valid = false;
                            $position--;
                            break;
                        }
                    }
                } else {
                    $position = $strlen - 1;
                    $valid    = false;
                }
            }

            // Percent encode anything invalid or not in ucschar
            if (
                // Invalid sequences
                !$valid
                // Non-shortest form sequences are invalid
                || $length > 1 && $character <= 0x7F
                || $length > 2 && $character <= 0x7FF
                || $length > 3 && $character <= 0xFFFF
                // Outside of range of ucschar codepoints
                // Noncharacters
                || ($character & 0xFFFE) == 0xFFFE
                || $character >= 0xFDD0 && $character <= 0xFDEF
                || (
                    // Everything else not in ucschar
                    $character > 0xD7FF && $character < 0xF900
                    || $character                     < 0xA0
                    || $character > 0xEFFFD
                )
                && (
                    // Everything not in iprivate, if it applies
                    !$iprivate
                    || $character < 0xE000
                    || $character > 0x10FFFD
                )
            ) {
                // If we were a character, pretend we weren't, but rather an error.
                if ($valid) {
                    $position--;
                }

                for ($j = $start; $j <= $position; $j++) {
                    $text = substr_replace($text, sprintf('%%%02X', ord($text[$j])), $j, 1);
                    $j        += 2;
                    $position += 2;
                    $strlen   += 2;
                }
            }
        }

        return $text;
    }

    /**
     * Callback function for preg_replace_callback.
     *
     * Removes sequences of percent encoded bytes that represent UTF-8
     * encoded characters in iunreserved
     *
     * @param array $regex_match PCRE match
     * @return string Replacement
     */
    protected function remove_iunreserved_percent_encoded($regex_match)
    {
        // As we just have valid percent encoded sequences we can just explode
        // and ignore the first member of the returned array (an empty string).
        $bytes = explode('%', $regex_match[0]);

        // Initialize the new string (this is what will be returned) and that
        // there are no bytes remaining in the current sequence (unsurprising
        // at the first byte!).
        $string    = '';
        $remaining = 0;

        // Loop over each and every byte, and set $value to its value
        for ($i = 1, $len = count($bytes); $i < $len; $i++) {
            $value = hexdec($bytes[$i]);

            // If we're the first byte of sequence:
            if (!$remaining) {
                // Start position
                $start = $i;

                // By default we are valid
                $valid = true;

                // One byte sequence:
                if ($value <= 0x7F) {
                    $character = $value;
                    $length    = 1;
                }
                // Two byte sequence:
                elseif (($value & 0xE0) == 0xC0) {
                    $character = ($value & 0x1F) << 6;
                    $length    = 2;
                    $remaining = 1;
                }
                // Three byte sequence:
                elseif (($value & 0xF0) == 0xE0) {
                    $character = ($value & 0x0F) << 12;
                    $length    = 3;
                    $remaining = 2;
                }
                // Four byte sequence:
                elseif (($value & 0xF8) == 0xF0) {
                    $character = ($value & 0x07) << 18;
                    $length    = 4;
                    $remaining = 3;
                }
                // Invalid byte:
                else {
                    $valid     = false;
                    $remaining = 0;
                }
            }
            // Continuation byte:
            else {
                // Check that the byte is valid, then add it to the character:
                if (($value & 0xC0) == 0x80) {
                    $remaining--;
                    $character |= ($value & 0x3F) << ($remaining * 6);
                }
                // If it is invalid, count the sequence as invalid and reprocess the current byte as the start of a sequence:
                else {
                    $valid     = false;
                    $remaining = 0;
                    $i--;
                }
            }

            // If we've reached the end of the current byte sequence, append it to Unicode::$data
            if (!$remaining) {
                // Percent encode anything invalid or not in iunreserved
                if (
                    // Invalid sequences
                    !$valid
                    // Non-shortest form sequences are invalid
                    || $length > 1 && $character <= 0x7F
                    || $length > 2 && $character <= 0x7FF
                    || $length > 3 && $character <= 0xFFFF
                    // Outside of range of iunreserved codepoints
                    || $character < 0x2D
                    || $character > 0xEFFFD
                    // Noncharacters
                    || ($character & 0xFFFE) == 0xFFFE
                    || $character >= 0xFDD0 && $character <= 0xFDEF
                    // Everything else not in iunreserved (this is all BMP)
                    || $character == 0x2F
                    || $character > 0x39   && $character < 0x41
                    || $character > 0x5A   && $character < 0x61
                    || $character > 0x7A   && $character < 0x7E
                    || $character > 0x7E   && $character < 0xA0
                    || $character > 0xD7FF && $character < 0xF900
                ) {
                    for ($j = $start; $j <= $i; $j++) {
                        $string .= '%' . strtoupper($bytes[$j]);
                    }
                } else {
                    for ($j = $start; $j <= $i; $j++) {
                        $string .= chr(hexdec($bytes[$j]));
                    }
                }
            }
        }

        // If we have any bytes left over they are invalid (i.e., we are
        // mid-way through a multi-byte sequence)
        if ($remaining) {
            for ($j = $start; $j < $len; $j++) {
                $string .= '%' . strtoupper($bytes[$j]);
            }
        }

        return $string;
    }

    protected function scheme_normalization()
    {
        if (isset($this->normalization[$this->scheme]['iuserinfo']) && $this->iuserinfo == $this->normalization[$this->scheme]['iuserinfo']) {
            $this->iuserinfo = null;
        }

        if (isset($this->normalization[$this->scheme]['ihost']) && $this->ihost == $this->normalization[$this->scheme]['ihost']) {
            $this->ihost = null;
        }

        if (isset($this->normalization[$this->scheme]['port']) && $this->port == $this->normalization[$this->scheme]['port']) {
            $this->port = null;
        }

        if (isset($this->normalization[$this->scheme]['ipath']) && $this->ipath == $this->normalization[$this->scheme]['ipath']) {
            $this->ipath = '';
        }

        if (isset($this->ihost) && empty($this->ipath)) {
            $this->ipath = '/';
        }

        if (isset($this->normalization[$this->scheme]['iquery']) && $this->iquery == $this->normalization[$this->scheme]['iquery']) {
            $this->iquery = null;
        }

        if (isset($this->normalization[$this->scheme]['ifragment']) && $this->ifragment == $this->normalization[$this->scheme]['ifragment']) {
            $this->ifragment = null;
        }
    }

    /**
     * Check if the object represents a valid IRI. This needs to be done on each
     * call as some things change depending on another part of the IRI.
     *
     * @return bool
     */
    public function is_valid()
    {
        $isauthority = $this->iuserinfo != null || $this->ihost != null || $this->port != null;

        if ($this->ipath != '' && (
            $isauthority && $this->ipath[0] != '/' || (
                $this->scheme == null && !$isauthority && strpos($this->ipath, ':') != false && (strpos($this->ipath, '/') == false ? true : strpos($this->ipath, ':') < strpos($this->ipath, '/'))
            )
        )
        ) {
            return false;
        }

        return true;
    }

    /**
     * Set the entire IRI. Returns true on success, false on failure (if there
     * are any invalid characters).
     *
     * @param string $iri
     * @return bool
     */
    protected function set_iri($iri)
    {
        static $cache;

        if (!$cache) {
            $cache = [];
        }

        if ($iri == null) {
            return true;
        }

        $iri = (string) $iri;

        if (isset($cache[$iri])) {
            [$this->scheme,
                $this->iuserinfo,
                $this->ihost,
                $this->port,
                $this->ipath,
                $this->iquery,
                $this->ifragment,
                $return] = $cache[$iri];

            return $return;
        }

        $parsed = $this->parse_iri($iri);

        $return = $this->set_scheme($parsed['scheme'])
            && $this->set_authority($parsed['authority'])
            && $this->set_path($parsed['path'])
            && $this->set_query($parsed['query'])
            && $this->set_fragment($parsed['fragment']);

        $cache[$iri] = [$this->scheme,
                             $this->iuserinfo,
                             $this->ihost,
                             $this->port,
                             $this->ipath,
                             $this->iquery,
                             $this->ifragment,
                             $return];

        return $return;
    }

    /**
     * Set the scheme. Returns true on success, false on failure (if there are
     * any invalid characters).
     *
     * @param string $scheme
     * @return bool
     */
    protected function set_scheme($scheme)
    {
        if ($scheme == null) {
            $this->scheme = null;
        } elseif (!preg_match('/^[A-Za-z][0-9A-Za-z+\-.]*$/', $scheme)) {
            $this->scheme = null;

            return false;
        } else {
            $this->scheme = strtolower($scheme);
        }

        return true;
    }

    /**
     * Set the authority. Returns true on success, false on failure (if there are
     * any invalid characters).
     *
     * @param string $authority
     * @return bool
     */
    protected function set_authority($authority)
    {
        static $cache;

        if (!$cache) {
            $cache = [];
        }

        if ($authority == null) {
            $this->iuserinfo = null;
            $this->ihost     = null;
            $this->port      = null;

            return true;
        }

        if (isset($cache[$authority])) {
            [$this->iuserinfo,
                $this->ihost,
                $this->port,
                $return] = $cache[$authority];

            return $return;
        }

        $remaining = $authority;

        if (($iuserinfo_end = strrpos($remaining, '@')) != false) {
            $iuserinfo = substr($remaining, 0, $iuserinfo_end);
            $remaining = substr($remaining, $iuserinfo_end + 1);
        } else {
            $iuserinfo = null;
        }

        if (($port_start = strpos($remaining, ':', strpos($remaining, ']'))) != false) {
            $port = substr($remaining, $port_start + 1);

            if ($port == false || $port == '') {
                $port = null;
            }
            $remaining = substr($remaining, 0, $port_start);
        } else {
            $port = null;
        }

        $return = $this->set_userinfo($iuserinfo) && $this->set_host($remaining) && $this->set_port($port);

        $cache[$authority] = [$this->iuserinfo,
                                   $this->ihost,
                                   $this->port,
                                   $return];

        return $return;
    }

    /**
     * Set the iuserinfo.
     *
     * @param string $iuserinfo
     * @return bool
     */
    protected function set_userinfo($iuserinfo)
    {
        if ($iuserinfo == null) {
            $this->iuserinfo = null;
        } else {
            $this->iuserinfo = $this->replace_invalid_with_pct_encoding($iuserinfo, '!$&\'()*+,;=:');
            $this->scheme_normalization();
        }

        return true;
    }

    /**
     * Set the ihost. Returns true on success, false on failure (if there are
     * any invalid characters).
     *
     * @param string $ihost
     * @return bool
     */
    protected function set_host($ihost)
    {
        if ($ihost == null) {
            $this->ihost = null;

            return true;
        }

        if (substr($ihost, 0, 1) == '[' && substr($ihost, -1) == ']') {
            if (Ipv6::check_ipv6(substr($ihost, 1, -1))) {
                $this->ihost = '[' . Ipv6::compress(substr($ihost, 1, -1)) . ']';
            } else {
                $this->ihost = null;

                return false;
            }
        } else {
            $ihost = $this->replace_invalid_with_pct_encoding($ihost, '!$&\'()*+,;=');

            // Lowercase, but ignore pct-encoded sections (as they should
            // remain uppercase). This must be done after the previous step
            // as that can add unescaped characters.
            $position = 0;
            $strlen   = strlen($ihost);
            while (($position += strcspn($ihost, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ%', $position)) < $strlen) {
                if ($ihost[$position] == '%') {
                    $position += 3;
                } else {
                    $ihost[$position] = strtolower($ihost[$position]);
                    $position++;
                }
            }

            $this->ihost = $ihost;
        }

        $this->scheme_normalization();

        return true;
    }

    /**
     * Set the port. Returns true on success, false on failure (if there are
     * any invalid characters).
     *
     * @param string $port
     * @return bool
     */
    protected function set_port($port)
    {
        if ($port == null) {
            $this->port = null;

            return true;
        }

        if (strspn($port, '0123456789') == strlen($port)) {
            $this->port = (int) $port;
            $this->scheme_normalization();

            return true;
        }

        $this->port = null;

        return false;
    }

    /**
     * Set the ipath.
     *
     * @param string $ipath
     * @return bool
     */
    protected function set_path($ipath)
    {
        static $cache;

        if (!$cache) {
            $cache = [];
        }

        $ipath = (string) $ipath;

        if (isset($cache[$ipath])) {
            $this->ipath = $cache[$ipath][(int) ($this->scheme != null)];
        } else {
            $valid   = $this->replace_invalid_with_pct_encoding($ipath, '!$&\'()*+,;=@:/');
            $removed = $this->remove_dot_segments($valid);

            $cache[$ipath] = [$valid, $removed];
            $this->ipath   = ($this->scheme != null) ? $removed : $valid;
        }
        $this->scheme_normalization();

        return true;
    }

    /**
     * Set the iquery.
     *
     * @param string $iquery
     * @return bool
     */
    protected function set_query($iquery)
    {
        if ($iquery == null) {
            $this->iquery = null;
        } else {
            $this->iquery = $this->replace_invalid_with_pct_encoding($iquery, '!$&\'()*+,;=:@/?', true);
            $this->scheme_normalization();
        }

        return true;
    }

    /**
     * Set the ifragment.
     *
     * @param string $ifragment
     * @return bool
     */
    protected function set_fragment($ifragment)
    {
        if ($ifragment == null) {
            $this->ifragment = null;
        } else {
            $this->ifragment = $this->replace_invalid_with_pct_encoding($ifragment, '!$&\'()*+,;=:@/?');
            $this->scheme_normalization();
        }

        return true;
    }

    /**
     * Convert an IRI to a URI (or parts thereof)
     *
     * @param string|bool $iri IRI to convert (or false from {@see \WpOrg\Requests\Iri::get_iri()})
     * @return string|false URI if IRI is valid, false otherwise.
     */
    protected function to_uri($iri)
    {
        if (!is_string($iri)) {
            return false;
        }

        static $non_ascii;

        if (!$non_ascii) {
            $non_ascii = implode('', range("\x80", "\xFF"));
        }

        $position = 0;
        $strlen   = strlen($iri);
        while (($position += strcspn($iri, $non_ascii, $position)) < $strlen) {
            $iri = substr_replace($iri, sprintf('%%%02X', ord($iri[$position])), $position, 1);
            $position += 3;
            $strlen   += 2;
        }

        return $iri;
    }

    /**
     * Get the complete IRI
     *
     * @return string|false
     */
    protected function get_iri()
    {
        if (!$this->is_valid()) {
            return false;
        }

        $iri = '';

        if ($this->scheme != null) {
            $iri .= $this->scheme . ':';
        }

        if (($iauthority = $this->get_iauthority()) != null) {
            $iri .= '//' . $iauthority;
        }
        $iri .= $this->ipath;

        if ($this->iquery != null) {
            $iri .= '?' . $this->iquery;
        }

        if ($this->ifragment != null) {
            $iri .= '#' . $this->ifragment;
        }

        return $iri;
    }

    /**
     * Get the complete URI
     *
     * @return string
     */
    protected function get_uri()
    {
        return $this->to_uri($this->get_iri());
    }

    /**
     * Get the complete iauthority
     *
     * @return string|null
     */
    protected function get_iauthority()
    {
        if ($this->iuserinfo == null && $this->ihost == null && $this->port == null) {
            return null;
        }

        $iauthority = '';

        if ($this->iuserinfo != null) {
            $iauthority .= $this->iuserinfo . '@';
        }

        if ($this->ihost != null) {
            $iauthority .= $this->ihost;
        }

        if ($this->port != null) {
            $iauthority .= ':' . $this->port;
        }

        return $iauthority;
    }

    /**
     * Get the complete authority
     *
     * @return string
     */
    protected function get_authority()
    {
        $iauthority = $this->get_iauthority();

        if (is_string($iauthority)) {
            return $this->to_uri($iauthority);
        } else {
            return $iauthority;
        }
    }
}
