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Add php_idn lib to support IDN/punycode emails

Browse Source 
This external library adds functions to encode and decode email
addresses using extended utf-8 character sets. Example
examlpe@bånnibøtta.no

The library is written as simple functions rather than a class.
Original code at https://github.com/IgorVBelousov/php_idn
This commit is contained in:
Thomas Nilsen 2018-11-25 17:06:03 +01:00
parent cd6ce3c8d8
commit d504b0a4cc
3 changed files with 855 additions and 0 deletions
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PHP IDN Punycode
================
Encode and decode IDN Punycode if not exists internal php functions `idn_to_ascii` and `idn_to_utf8`.
Functions use algorithm by rfc 3492.
[![Build Status](https://travis-ci.org/IgorVBelousov/php_idn.svg?branch=master)](https://travis-ci.org/IgorVBelousov/php_idn)
**function EncodePunycodeIDN( $value )** string
Encode UTF-8 domain name to IDN Punycode
Parameters:
string **$value** Domain name
Returns:
Encoded Domain name
**function DecodePunycodeIDN( $value )** string
Decode IDN Punycode to UTF-8 domain name
Parameters:
string **$value** Punycode
Returns:
Domain name in UTF-8 charset

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<?php
/**
* Finds the character code for a UTF-8 character: like ord() but for UTF-8.
*
* @author Nicolas Thouvenin <nthouvenin@gmail.com>
* @copyright 2008 Nicolas Thouvenin
* @license http://opensource.org/licenses/LGPL-2.1 LGPL v2.1
*/
function ordUTF8($c, $index = 0, &$bytes = null)
{
$len = strlen($c);
$bytes = 0;
if ($index >= $len)
return false;
$h = ord($c{$index});
if ($h <= 0x7F) {
$bytes = 1;
return $h;
}
else if ($h < 0xC2)
return false;
else if ($h <= 0xDF && $index < $len - 1) {
$bytes = 2;
return ($h & 0x1F) << 6 | (ord($c{$index + 1}) & 0x3F);
}
else if ($h <= 0xEF && $index < $len - 2) {
$bytes = 3;
return ($h & 0x0F) << 12 | (ord($c{$index + 1}) & 0x3F) << 6
| (ord($c{$index + 2}) & 0x3F);
}
else if ($h <= 0xF4 && $index < $len - 3) {
$bytes = 4;
return ($h & 0x0F) << 18 | (ord($c{$index + 1}) & 0x3F) << 12
| (ord($c{$index + 2}) & 0x3F) << 6
| (ord($c{$index + 3}) & 0x3F);
}
else
return false;
}
/**
* Encode UTF-8 domain name to IDN Punycode
*
* @param string $value Domain name
* @return string Encoded Domain name
*
* @author Igor V Belousov <igor@belousovv.ru>
* @copyright 2013, 2015 Igor V Belousov
* @license http://opensource.org/licenses/LGPL-2.1 LGPL v2.1
* @link http://belousovv.ru/myscript/phpIDN
*/
function EncodePunycodeIDN( $value )
{
if ( function_exists( 'idn_to_ascii' ) ) {
return idn_to_ascii( $value );
}
/* search subdomains */
$sub_domain = explode( '.', $value );
if ( count( $sub_domain ) > 1 ) {
$sub_result = '';
foreach ( $sub_domain as $sub_value ) {
$sub_result .= '.' . EncodePunycodeIDN( $sub_value );
}
return substr( $sub_result, 1 );
}
/* http://tools.ietf.org/html/rfc3492#section-6.3 */
$n = 0x80;
$delta = 0;
$bias = 72;
$output = array();
$input = array();
$str = $value;
while ( mb_strlen( $str , 'UTF-8' ) > 0 )
{
array_push( $input, mb_substr( $str, 0, 1, 'UTF-8' ) );
$str = (version_compare(PHP_VERSION, '5.4.8','<'))?mb_substr( $str, 1, mb_strlen($str, 'UTF-8') , 'UTF-8' ):mb_substr( $str, 1, null, 'UTF-8' );
}
/* basic symbols */
$basic = preg_grep( '/[\x00-\x7f]/', $input );
$b = $basic;
if ( $b == $input )
{
return $value;
}
$b = count( $b );
if ( $b > 0 ) {
$output = $basic;
/* add delimeter */
$output[] = '-';
}
unset($basic);
/* add prefix */
array_unshift( $output, 'xn--' );
$input_len = count( $input );
$h = $b;
$ord_input = array();
while ( $h < $input_len ) {
$m = 0x10FFFF;
for ( $i = 0; $i < $input_len; ++$i )
{
$ord_input[ $i ] = ordUtf8( $input[ $i ] );
if ( ( $ord_input[ $i ] >= $n ) && ( $ord_input[ $i ] < $m ) )
{
$m = $ord_input[ $i ];
}
}
if ( ( $m - $n ) > ( 0x10FFFF / ( $h + 1 ) ) )
{
return $value;
}
$delta += ( $m - $n ) * ( $h + 1 );
$n = $m;
for ( $i = 0; $i < $input_len; ++$i )
{
$c = $ord_input[ $i ];
if ( $c < $n )
{
++$delta;
if ( $delta == 0 )
{
return $value;
}
}
if ( $c == $n )
{
$q = $delta;
for ( $k = 36;; $k += 36 )
{
if ( $k <= $bias )
{
$t = 1;
}
elseif ( $k >= ( $bias + 26 ) )
{
$t = 26;
}
else
{
$t = $k - $bias;
}
if ( $q < $t )
{
break;
}
$tmp_int = $t + ( $q - $t ) % ( 36 - $t );
$output[] = chr( ( $tmp_int + 22 + 75 * ( $tmp_int < 26 ) ) );
$q = ( $q - $t ) / ( 36 - $t );
}
$output[] = chr( ( $q + 22 + 75 * ( $q < 26 ) ) );
/* http://tools.ietf.org/html/rfc3492#section-6.1 */
$delta = ( $h == $b ) ? $delta / 700 : $delta>>1;
$delta += intval( $delta / ( $h + 1 ) );
$k2 = 0;
while ( $delta > 455 )
{
$delta /= 35;
$k2 += 36;
}
$bias = intval( $k2 + 36 * $delta / ( $delta + 38 ) );
/* end section-6.1 */
$delta = 0;
++$h;
}
}
++$delta;
++$n;
}
return implode( '', $output );
}
/**
* Decode IDN Punycode to UTF-8 domain name
*
* @param string $value Punycode
* @return string Domain name in UTF-8 charset
*
* @author Igor V Belousov <igor@belousovv.ru>
* @copyright 2013, 2015 Igor V Belousov
* @license http://opensource.org/licenses/LGPL-2.1 LGPL v2.1
* @link http://belousovv.ru/myscript/phpIDN
*/
function DecodePunycodeIDN( $value )
{
if ( function_exists( 'idn_to_utf8' ) ) {
return idn_to_utf8( $value );
}
/* search subdomains */
$sub_domain = explode( '.', $value );
if ( count( $sub_domain ) > 1 ) {
$sub_result = '';
foreach ( $sub_domain as $sub_value ) {
$sub_result .= '.' . DecodePunycodeIDN( $sub_value );
}
return substr( $sub_result, 1 );
}
/* search prefix */
if ( substr( $value, 0, 4 ) != 'xn--' )
{
return $value;
}
else
{
$bad_input = $value;
$value = substr( $value, 4 );
}
$n = 0x80;
$i = 0;
$bias = 72;
$output = array();
/* search delimeter */
$d = strrpos( $value, '-' );
if ( $d > 0 ) {
for ( $j = 0; $j < $d; ++$j) {
$c = $value[ $j ];
$output[] = $c;
if ( $c > 0x7F )
{
return $bad_input;
}
}
++$d;
} else {
$d = 0;
}
while ($d < strlen( $value ) )
{
$old_i = $i;
$w = 1;
for ($k = 36;; $k += 36)
{
if ( $d == strlen( $value ) )
{
return $bad_input;
}
$c = $value[ $d++ ];
$c = ord( $c );
$digit = ( $c - 48 < 10 ) ? $c - 22 :
(
( $c - 65 < 26 ) ? $c - 65 :
(
( $c - 97 < 26 ) ? $c - 97 : 36
)
);
if ( $digit > ( 0x10FFFF - $i ) / $w )
{
return $bad_input;
}
$i += $digit * $w;
if ( $k <= $bias )
{
$t = 1;
}
elseif ( $k >= $bias + 26 )
{
$t = 26;
}
else
{
$t = $k - $bias;
}
if ( $digit < $t ) {
break;
}
$w *= 36 - $t;
}
$delta = $i - $old_i;
/* http://tools.ietf.org/html/rfc3492#section-6.1 */
$delta = ( $old_i == 0 ) ? $delta/700 : $delta>>1;
$count_output_plus_one = count( $output ) + 1;
$delta += intval( $delta / $count_output_plus_one );
$k2 = 0;
while ( $delta > 455 )
{
$delta /= 35;
$k2 += 36;
}
$bias = intval( $k2 + 36 * $delta / ( $delta + 38 ) );
/* end section-6.1 */
if ( $i / $count_output_plus_one > 0x10FFFF - $n )
{
return $bad_input;
}
$n += intval( $i / $count_output_plus_one );
$i %= $count_output_plus_one;
array_splice( $output, $i, 0,
html_entity_decode( '&#' . $n . ';', ENT_NOQUOTES, 'UTF-8' )
);
++$i;
}
return implode( '', $output );
}