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Edit File : IRI.php \| Size : 27.80 KB
<?php /** * IRI parser/serialiser/normaliser * * @package Requests * @subpackage Utilities / /* * 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 * @subpackage Utilities * @author Geoffrey Sneddon * @author Steve Minutillo * @copyright 2007-2009 Geoffrey Sneddon and Steve Minutillo * @license http://www.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 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 Requests_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 = array( 'acap' => array( 'port' => 674 ), 'dict' => array( 'port' => 2628 ), 'file' => array( 'ihost' => 'localhost' ), 'http' => array( 'port' => 80, ), 'https' => array( 'port' => 443, ), ); /* * 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_' . $name)) { call_user_func(array($this, 'set_' . $name), $value); } elseif ( $name === 'iauthority' \|\| $name === 'iuserinfo' \|\| $name === 'ihost' \|\| $name === 'ipath' \|\| $name === 'iquery' \|\| $name === 'ifragment' ) { call_user_func(array($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_' . $name)) { call_user_func(array($this, 'set_' . $name), ''); } } /* * Create a new IRI object, from a specified string * * @param string\|null $iri / public function __construct($iri = null) { $this->set_iri($iri); } /* * Create a new IRI object by resolving a relative IRI * * Returns false if $base is not absolute, otherwise an IRI. * * @param IRI\|string $base (Absolute) Base IRI * @param IRI\|string $relative Relative IRI * @return IRI\|false / public static function absolutize($base, $relative) { if (!($relative instanceof Requests_IRI)) { $relative = new Requests_IRI($relative); } if (!$relative->is_valid()) { return false; } elseif ($relative->scheme !== null) { return clone $relative; } if (!($base instanceof Requests_IRI)) { $base = new Requests_IRI($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 Requests_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; } /* * 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 Requests_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 $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 $string = preg_replace_callback('/(?:%[A-Fa-f0-9]{2})+/', array(&$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]); // 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++) { $value = ord($string[$position]); // Check that the byte is valid, then add it to the character: if (($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++) { $string = substr_replace($string, sprintf('%%%02X', ord($string[$j])), $j, 1); $j += 2; $position += 2; $strlen += 2; } } } return $string; } /** * Callback function for preg_replace_callback. * * Removes sequences of percent encoded bytes that represent UTF-8 * encoded characters in iunreserved * * @param array $match PCRE match * @return string Replacement / protected function remove_iunreserved_percent_encoded($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('%', $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) { $cache = array(); } if ($iri === null) { return true; } if (isset($cache[$iri])) { list($this->scheme, $this->iuserinfo, $this->ihost, $this->port, $this->ipath, $this->iquery, $this->ifragment, $return) = $cache[$iri]; return $return; } $parsed = $this->parse_iri((string) $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] = array($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) { $cache = array(); } if ($authority === null) { $this->iuserinfo = null; $this->ihost = null; $this->port = null; return true; } if (isset($cache[$authority])) { list($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] = array($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($ihost, -1) === ']') { if (Requests_IPv6::check_ipv6(substr($ihost, 1, -1))) { $this->ihost = '[' . Requests_IPv6::compress(substr($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 = array(); } $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] = array($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, '!$&\'()+,;=:@/?'); $this->scheme_normalization(); } return true; } /** * Convert an IRI to a URI (or parts thereof) * * @param string\|bool IRI to convert (or false from {@see get_iri}) * @return string\|false URI if IRI is valid, false otherwise. / protected function to_uri($string) { if (!is_string($string)) { return false; } static $non_ascii; if (!$non_ascii) { $non_ascii = implode('', range("\x80", "\xFF")); } $position = 0; $strlen = strlen($string); while (($position += strcspn($string, $non_ascii, $position)) < $strlen) { $string = substr_replace($string, sprintf('%%%02X', ord($string[$position])), $position, 1); $position += 3; $strlen += 2; } return $string; } /* * Get the complete IRI * * @return string / protected function get_iri() { if (!$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 / 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; } } } Back

Edit File : IRI.php | Size : 27.80 KB

<?php
/**
 * IRI parser/serialiser/normaliser
 *
 * @package Requests
 * @subpackage Utilities
 */

/**
 * 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
 * @subpackage Utilities
 * @author Geoffrey Sneddon
 * @author Steve Minutillo
 * @copyright 2007-2009 Geoffrey Sneddon and Steve Minutillo
 * @license http://www.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 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 Requests_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 = array(
		'acap' => array(
			'port' => 674
		),
		'dict' => array(
			'port' => 2628
		),
		'file' => array(
			'ihost' => 'localhost'
		),
		'http' => array(
			'port' => 80,
		),
		'https' => array(
			'port' => 443,
		),
	);

/**
	 * 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_' . $name)) {
			call_user_func(array($this, 'set_' . $name), $value);
		}
		elseif (
			   $name === 'iauthority'
			|| $name === 'iuserinfo'
			|| $name === 'ihost'
			|| $name === 'ipath'
			|| $name === 'iquery'
			|| $name === 'ifragment'
		) {
			call_user_func(array($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_' . $name)) {
			call_user_func(array($this, 'set_' . $name), '');
		}
	}

/**
	 * Create a new IRI object, from a specified string
	 *
	 * @param string|null $iri
	 */
	public function __construct($iri = null) {
		$this->set_iri($iri);
	}

/**
	 * Create a new IRI object by resolving a relative IRI
	 *
	 * Returns false if $base is not absolute, otherwise an IRI.
	 *
	 * @param IRI|string $base (Absolute) Base IRI
	 * @param IRI|string $relative Relative IRI
	 * @return IRI|false
	 */
	public static function absolutize($base, $relative) {
		if (!($relative instanceof Requests_IRI)) {
			$relative = new Requests_IRI($relative);
		}
		if (!$relative->is_valid()) {
			return false;
		}
		elseif ($relative->scheme !== null) {
			return clone $relative;
		}

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

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

// 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++) {
						$value = ord($string[$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++) {
					$string = substr_replace($string, sprintf('%%%02X', ord($string[$j])), $j, 1);
					$j += 2;
					$position += 2;
					$strlen += 2;
				}
			}
		}

return $string;
	}

/**
	 * Callback function for preg_replace_callback.
	 *
	 * Removes sequences of percent encoded bytes that represent UTF-8
	 * encoded characters in iunreserved
	 *
	 * @param array $match PCRE match
	 * @return string Replacement
	 */
	protected function remove_iunreserved_percent_encoded($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('%', $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 = array();
		}

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

$parsed = $this->parse_iri((string) $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] = array($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 = array();
		}

if ($authority === null) {
			$this->iuserinfo = null;
			$this->ihost = null;
			$this->port = null;
			return true;
		}
		if (isset($cache[$authority])) {
			list($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] = array($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($ihost, -1) === ']') {
			if (Requests_IPv6::check_ipv6(substr($ihost, 1, -1))) {
				$this->ihost = '[' . Requests_IPv6::compress(substr($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 = array();
		}

$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] = array($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 to convert (or false from {@see get_iri})
	 * @return string|false URI if IRI is valid, false otherwise.
	 */
	protected function to_uri($string) {
		if (!is_string($string)) {
			return false;
		}

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

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

return $string;
	}

/**
	 * Get the complete IRI
	 *
	 * @return string
	 */
	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
	 */
	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;
		}
	}
}

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