full-text-rss/libraries/iri/iri.php
2011-01-11 19:06:12 +01:00

1397 lines
42 KiB
PHP

<?php
/**
* IRI parser/serialiser/normaliser
*
* Copyright (c) 2007-2009, 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 IRI
* @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/
*
* @todo Per-scheme validation
*/
class IRI
{
/**
* Scheme
*
* @var string
*/
private $scheme;
/**
* User Information
*
* @var string
*/
private $iuserinfo;
/**
* ihost
*
* @var string
*/
private $ihost;
/**
* Port
*
* @var string
*/
private $port;
/**
* ipath
*
* @var string
*/
private $ipath;
/**
* iquery
*
* @var string
*/
private $iquery;
/**
* ifragment
*
* @var string
*/
private $ifragment;
/**
* 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.
*/
private $normalization = array(
'acap' => array(
'port' => 674
),
'dict' => array(
'port' => 2628
),
'file' => array(
'ihost' => 'localhost'
),
'http' => array(
'port' => 80,
'ipath' => '/'
),
'https' => array(
'port' => 443,
'ipath' => '/'
),
);
/**
* Return the entire IRI when you try and read the object as a string
*
* @return string
*/
public function __toString()
{
return $this->iri;
}
/**
* Overload __set() to provide access via properties
*
* @param string $name Property name
* @param mixed $value Property value
* @return void
*/
public function __set($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)
{
if (!$this->is_valid())
{
return false;
}
elseif (method_exists($this, 'get_' . $name))
{
$return = call_user_func(array($this, 'get_' . $name));
}
elseif (isset($this->$name))
{
$return = $this->$name;
}
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)
{
if (method_exists($this, 'get_' . $name) || isset($this->$name))
{
return true;
}
else
{
return false;
}
}
/**
* Overload __unset() to provide access via properties
*
* @param string $name Property name
* @param mixed $value Property value
* @return void
*/
public function __unset($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 $iri
* @return IRI
*/
public function __construct($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 $base (Absolute) Base IRI
* @param IRI|string $relative Relative IRI
* @return IRI|false
*/
public static function absolutize(IRI $base, $relative)
{
if (!($relative instanceof IRI))
{
$relative = new IRI($relative);
}
if ($base->scheme !== null)
{
if ($relative->iri !== '' && $relative->iri !== null)
{
if ($relative->scheme !== null)
{
$target = clone $relative;
}
elseif ($relative->iauthority !== 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 === null)
{
$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;
}
else
{
return false;
}
}
/**
* Create a new IRI object by creating a relative IRI from two IRIs
*
* @param IRI $base Base IRI
* @param IRI $destination Destination IRI
* @return IRI
*/
public static function build_relative(IRI $base, IRI $destination)
{
}
/**
* Parse an IRI into scheme/authority/path/query/fragment segments
*
* @param string $iri
* @return array
*/
private function parse_iri($iri)
{
$iri = trim($iri, "\x20\x09\x0A\x0C\x0D");
static $cache = array();
if (isset($cache[$iri]))
{
return $cache[$iri];
}
elseif ($iri === '')
{
return $cache[$iri] = array(
'scheme' => null,
'authority' => null,
'path' => '',
'query' => null,
'fragment' => null
);
}
elseif (preg_match('/^((?P<scheme>[^:\/?#]+):)?(\/\/(?P<authority>[^\/?#]*))?(?P<path>[^?#]*)(\?(?P<query>[^#]*))?(#(?P<fragment>.*))?$/', $iri, $match))
{
if (!isset($match[1]) || $match[1] === '')
{
$match['scheme'] = null;
}
if (!isset($match[3]) || $match[3] === '')
{
$match['authority'] = null;
}
if (!isset($match[5]) || $match[5] === '')
{
$match['path'] = '';
}
if (!isset($match[6]) || $match[6] === '')
{
$match['query'] = null;
}
if (!isset($match[8]) || $match[8] === '')
{
$match['fragment'] = null;
}
return $cache[$iri] = $match;
}
}
/**
* Remove dot segments from a path
*
* @param string $input
* @return string
*/
private function remove_dot_segments($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)
{
$input = substr_replace($input, '/', 0, 3);
}
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)
{
$input = substr_replace($input, '/', 0, 4);
$output = substr_replace($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 $iprivate Allow iprivate
* @return string
*/
private function replace_invalid_with_pct_encoding($string, $extra_chars, $iprivate = false)
{
// Replace invalid percent characters
$string = preg_replace('/%($|[^A-Fa-f0-9]|[A-Fa-f0-9][^A-Fa-f0-9])/', '%25\1', $string);
// Normalize as many pct-encoded sections as possible
$string = preg_replace_callback('/(?:%[A-Fa-f0-9]{2})+/', array(&$this, 'remove_iunreserved_percent_encoded'), $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 $match PCRE match
* @return string Replacement
*/
private function remove_iunreserved_percent_encoded($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 $string;
}
private function scheme_normalization()
{
if (isset($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'])
{
$this->ipath = null;
}
if (isset($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'])
{
$this->ifragment = null;
}
}
/**
* Check if the object represents a valid IRI. This needs to be done on each
* call as some things change depending on another part of the IRI.
*
* @return bool
*/
public function is_valid()
{
if ($this->ipath !== null && (
substr($this->ipath, 0, 2) === '//' && $this->get_iauthority() === null
|| substr($this->ipath, 0, 1) !== '/' && $this->ipath !== '' && $this->get_iauthority() !== null
|| strpos($this->ipath, ':') !== false && (strpos($this->ipath, '/') === false ? true : strpos($this->ipath, ':') < strpos($this->ipath, '/')) && $this->scheme === null && $this->get_iauthority() === null
)
)
{
return false;
}
return true;
}
/**
* Set the entire IRI. Returns true on success, false on failure (if there
* are any invalid characters).
*
* @param string $iri
* @return bool
*/
private function set_iri($iri)
{
if ($iri !== null)
{
$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']);
}
}
/**
* Set the scheme. Returns true on success, false on failure (if there are
* any invalid characters).
*
* @param string $scheme
* @return bool
*/
private function set_scheme($scheme)
{
if ($scheme === null)
{
$this->scheme = null;
}
elseif (
!($scheme = (string) $scheme)
|| !isset($scheme[0])
|| $scheme[0] < 'A'
|| $scheme[0] > 'Z' && $scheme[0] < 'a'
|| $scheme[0] > 'z'
|| strspn($scheme, 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-.') !== strlen($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 $authority
* @return bool
*/
private function set_authority($authority)
{
if (($iuserinfo_end = strrpos($authority, '@')) !== false)
{
$iuserinfo = substr($authority, 0, $iuserinfo_end);
$authority = substr($authority, $iuserinfo_end + 1);
}
else
{
$iuserinfo = null;
}
if (($port_start = strpos($authority, ':', strpos($authority, ']'))) !== false)
{
if (($port = substr($authority, $port_start + 1)) === false)
{
$port = null;
}
$authority = substr($authority, 0, $port_start);
}
else
{
$port = null;
}
return $this->set_userinfo($iuserinfo) && $this->set_host($authority) && $this->set_port($port);
}
/**
* Set the iuserinfo.
*
* @param string $iuserinfo
* @return bool
*/
private function set_userinfo($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 $ihost
* @return bool
*/
private function set_host($ihost)
{
if ($ihost === null)
{
$this->ihost = null;
return true;
}
elseif (substr($ihost, 0, 1) === '[' && substr($ihost, -1) === ']')
{
if (Net_IPv6::check_ipv6(substr($ihost, 1, -1)))
{
$this->ihost = '[' . Net_IPv6::compress(substr($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 $port
* @return bool
*/
private function set_port($port)
{
if ($port === null)
{
$this->port = null;
return true;
}
elseif (strspn($port, '0123456789') === strlen($port))
{
$this->port = (int) $port;
$this->scheme_normalization();
return true;
}
else
{
$this->port = null;
return false;
}
}
/**
* Set the ipath.
*
* @param string $ipath
* @return bool
*/
private function set_path($ipath)
{
if ($ipath === null)
{
$this->ipath = null;
return true;
}
else
{
$ipath = explode('/', $ipath);
$this->ipath = '';
foreach ($ipath as $segment)
{
$this->ipath .= $this->replace_invalid_with_pct_encoding($segment, '!$&\'()*+,;=@:');
$this->ipath .= '/';
}
$this->ipath = substr($this->ipath, 0, -1);
if ($this->scheme !== null)
{
$this->ipath = $this->remove_dot_segments($this->ipath);
}
$this->scheme_normalization();
return true;
}
}
/**
* Set the iquery.
*
* @param string $iquery
* @return bool
*/
private function set_query($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 $ifragment
* @return bool
*/
private function set_fragment($ifragment)
{
if ($ifragment === null)
{
$this->ifragment = null;
}
else
{
$this->ifragment = $this->replace_invalid_with_pct_encoding($ifragment, '!$&\'()*+,;=:@/?');
$this->scheme_normalization();
}
return true;
}
/**
* Convert an IRI to a URI (or parts thereof)
*
* @return string
*/
private function to_uri($string)
{
static $non_ascii = "\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\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
*/
private function get_iri()
{
$iri = '';
$defined = false;
if ($this->scheme !== null)
{
$iri .= $this->scheme . ':';
}
if (($iauthority = $this->iauthority) !== null)
{
$iri .= '//' . $iauthority;
}
if ($this->ipath !== null)
{
$iri .= $this->ipath;
$defined = true;
}
if ($this->iquery !== null)
{
$iri .= '?' . $this->iquery;
}
if ($this->ifragment !== null)
{
$iri .= '#' . $this->ifragment;
}
if ($iri !== '' || $defined)
{
return $iri;
}
else
{
return null;
}
}
/**
* Get the complete URI
*
* @return string
*/
private function get_uri()
{
$iri = $this->iri;
if (is_string($iri))
return $this->to_uri($iri);
else
return $iri;
}
/**
* Get the complete iauthority
*
* @return string
*/
private function get_iauthority()
{
$iauthority = '';
if ($this->iuserinfo !== null)
{
$iauthority .= $this->iuserinfo . '@';
}
if ($this->ihost !== null)
{
$iauthority .= $this->ihost;
}
if ($this->port !== null)
{
$iauthority .= ':' . $this->port;
}
if ($this->iuserinfo !== null || $this->ihost !== null || $this->port !== null)
{
return $iauthority;
}
else
{
return null;
}
}
/**
* Get the complete authority
*
* @return string
*/
private function get_authority()
{
$iauthority = $this->iauthority;
if (is_string($iauthority))
return $this->to_uri($iauthority);
else
return $iauthority;
}
}
/**
* Class to validate and to work with IPv6 addresses.
*
* This was originally based on the PEAR class of the same name, but has been
* almost entirely rewritten.
*/
class Net_IPv6
{
/**
* Uncompresses an IPv6 address
*
* RFC 4291 allows you to compress concecutive zero pieces in an address to
* '::'. This method expects a valid IPv6 address and expands the '::' to
* the required number of zero pieces.
*
* Example: FF01::101 -> FF01:0:0:0:0:0:0:101
* ::1 -> 0:0:0:0:0:0:0:1
*
* @author Alexander Merz <alexander.merz@web.de>
* @author elfrink at introweb dot nl
* @author Josh Peck <jmp at joshpeck dot org>
* @copyright 2003-2005 The PHP Group
* @license http://www.opensource.org/licenses/bsd-license.php
* @param string $ip An IPv6 address
* @return string The uncompressed IPv6 address
*/
public static function uncompress($ip)
{
$c1 = -1;
$c2 = -1;
if (substr_count($ip, '::') === 1)
{
list($ip1, $ip2) = explode('::', $ip);
if ($ip1 === '')
{
$c1 = -1;
}
else
{
$c1 = substr_count($ip1, ':');
}
if ($ip2 === '')
{
$c2 = -1;
}
else
{
$c2 = substr_count($ip2, ':');
}
if (strpos($ip2, '.') !== false)
{
$c2++;
}
// ::
if ($c1 === -1 && $c2 === -1)
{
$ip = '0:0:0:0:0:0:0:0';
}
// ::xxx
else if ($c1 === -1)
{
$fill = str_repeat('0:', 7 - $c2);
$ip = str_replace('::', $fill, $ip);
}
// xxx::
else if ($c2 === -1)
{
$fill = str_repeat(':0', 7 - $c1);
$ip = str_replace('::', $fill, $ip);
}
// xxx::xxx
else
{
$fill = ':' . str_repeat('0:', 6 - $c2 - $c1);
$ip = str_replace('::', $fill, $ip);
}
}
return $ip;
}
/**
* Compresses an IPv6 address
*
* RFC 4291 allows you to compress concecutive zero pieces in an address to
* '::'. This method expects a valid IPv6 address and compresses consecutive
* zero pieces to '::'.
*
* Example: FF01:0:0:0:0:0:0:101 -> FF01::101
* 0:0:0:0:0:0:0:1 -> ::1
*
* @see uncompress()
* @param string $ip An IPv6 address
* @return string The compressed IPv6 address
*/
public static function compress($ip)
{
// Prepare the IP to be compressed
$ip = self::uncompress($ip);
$ip_parts = self::split_v6_v4($ip);
// Break up the IP into each seperate part
$ipp = explode(':', $ip_parts[0]);
// Initialise vars to count consecutive zero pieces
$consecutive_zeros = 0;
$max_consecutive_zeros = 0;
for ($i = 0; $i < count($ipp); $i++)
{
// Normalise the number (this changes things like 01 to 0)
$ipp[$i] = dechex(hexdec($ipp[$i]));
// Count the zeros
if ($ipp[$i] === '0')
{
$consecutive_zeros++;
}
elseif ($consecutive_zeros > $max_consecutive_zeros)
{
$consecutive_zeros_pos = $i - $consecutive_zeros;
$max_consecutive_zeros = $consecutive_zeros;
$consecutive_zeros = 0;
}
}
if ($consecutive_zeros > $max_consecutive_zeros)
{
$consecutive_zeros_pos = $i - $consecutive_zeros;
$max_consecutive_zeros = $consecutive_zeros;
$consecutive_zeros = 0;
}
// Rebuild the IP
if ($max_consecutive_zeros > 0)
{
$cip = '';
for ($i = 0; $i < count($ipp); $i++)
{
// Add a : for the longest consecutive sequence, or :: if it's at the end
if ($i === $consecutive_zeros_pos)
{
if ($i === count($ipp) - $max_consecutive_zeros)
{
$cip .= '::';
}
else
{
$cip .= ':';
}
}
// Otherwise, just add the piece to the new output
elseif ($i < $consecutive_zeros_pos || $i >= $consecutive_zeros_pos + $max_consecutive_zeros)
{
if ($i !== 0)
{
$cip .= ':';
}
$cip .= $ipp[$i];
}
}
}
// Cheat if we don't have any zero pieces
else
{
$cip = implode(':', $ipp);
}
// Re-add any IPv4 part of the address
if ($ip_parts[1] !== '')
{
$cip .= ":{$ip_parts[1]}";
}
return $cip;
}
/**
* Splits an IPv6 address into the IPv6 and IPv4 representation parts
*
* RFC 4291 allows you to represent the last two parts of an IPv6 address
* using the standard IPv4 representation
*
* Example: 0:0:0:0:0:0:13.1.68.3
* 0:0:0:0:0:FFFF:129.144.52.38
*
* @param string $ip An IPv6 address
* @return array [0] contains the IPv6 represented part, and [1] the IPv4 represented part
*/
private static function split_v6_v4($ip)
{
if (strpos($ip, '.') !== false)
{
$pos = strrpos($ip, ':');
$ipv6_part = substr($ip, 0, $pos);
$ipv4_part = substr($ip, $pos + 1);
return array($ipv6_part, $ipv4_part);
}
else
{
return array($ip, '');
}
}
/**
* Checks an IPv6 address
*
* Checks if the given IP is a valid IPv6 address
*
* @param string $ip An IPv6 address
* @return bool true if $ip is a valid IPv6 address
*/
public static function check_ipv6($ip)
{
$ip = self::uncompress($ip);
list($ipv6, $ipv4) = self::split_v6_v4($ip);
$ipv6 = explode(':', $ipv6);
$ipv4 = explode('.', $ipv4);
if (count($ipv6) === 8 && count($ipv4) === 1 || count($ipv6) === 6 && count($ipv4) === 4)
{
foreach ($ipv6 as $ipv6_part)
{
$ipv6_part = ltrim($ipv6_part, '0');
if ($ipv6_part === '')
$ipv6_part = '0';
$value = hexdec($ipv6_part);
if (dechex($value) !== strtolower($ipv6_part) || $value < 0 || $value > 0xFFFF)
return false;
}
if (count($ipv4) === 4)
{
foreach ($ipv4 as $ipv4_part)
{
$value = (int) $ipv4_part;
if ((string) $value !== $ipv4_part || $value < 0 || $value > 0xFF)
return false;
}
}
return true;
}
else
{
return false;
}
}
}
?>