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<?php namespace Google\Site_Kit_Dependencies\TrueBV; use Google\Site_Kit_Dependencies\TrueBV\Exception\DomainOutOfBoundsException; use Google\Site_Kit_Dependencies\TrueBV\Exception\LabelOutOfBoundsException; /** * Punycode implementation as described in RFC 3492 * * @link http://tools.ietf.org/html/rfc3492 */ class Punycode { /** * Bootstring parameter values * */ const BASE = 36; const TMIN = 1; const TMAX = 26; const SKEW = 38; const DAMP = 700; const INITIAL_BIAS = 72; const INITIAL_N = 128; const PREFIX = 'xn--'; const DELIMITER = '-'; /** * Encode table * * @param array */ protected static $encodeTable = array('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'); /** * Decode table * * @param array */ protected static $decodeTable = array('a' => 0, 'b' => 1, 'c' => 2, 'd' => 3, 'e' => 4, 'f' => 5, 'g' => 6, 'h' => 7, 'i' => 8, 'j' => 9, 'k' => 10, 'l' => 11, 'm' => 12, 'n' => 13, 'o' => 14, 'p' => 15, 'q' => 16, 'r' => 17, 's' => 18, 't' => 19, 'u' => 20, 'v' => 21, 'w' => 22, 'x' => 23, 'y' => 24, 'z' => 25, '0' => 26, '1' => 27, '2' => 28, '3' => 29, '4' => 30, '5' => 31, '6' => 32, '7' => 33, '8' => 34, '9' => 35); /** * Character encoding * * @param string */ protected $encoding; /** * Constructor * * @param string $encoding Character encoding */ public function __construct($encoding = 'UTF-8') { $this->encoding = $encoding; } /** * Encode a domain to its Punycode version * * @param string $input Domain name in Unicode to be encoded * @return string Punycode representation in ASCII */ public function encode($input) { $input = \mb_strtolower($input, $this->encoding); $parts = \explode('.', $input); foreach ($parts as &$part) { $length = \strlen($part); if ($length < 1) { throw new \Google\Site_Kit_Dependencies\TrueBV\Exception\LabelOutOfBoundsException(\sprintf('The length of any one label is limited to between 1 and 63 octets, but %s given.', $length)); } $part = $this->encodePart($part); } $output = \implode('.', $parts); $length = \strlen($output); if ($length > 255) { throw new \Google\Site_Kit_Dependencies\TrueBV\Exception\DomainOutOfBoundsException(\sprintf('A full domain name is limited to 255 octets (including the separators), %s given.', $length)); } return $output; } /** * Encode a part of a domain name, such as tld, to its Punycode version * * @param string $input Part of a domain name * @return string Punycode representation of a domain part */ protected function encodePart($input) { $codePoints = $this->listCodePoints($input); $n = static::INITIAL_N; $bias = static::INITIAL_BIAS; $delta = 0; $h = $b = \count($codePoints['basic']); $output = ''; foreach ($codePoints['basic'] as $code) { $output .= $this->codePointToChar($code); } if ($input === $output) { return $output; } if ($b > 0) { $output .= static::DELIMITER; } $codePoints['nonBasic'] = \array_unique($codePoints['nonBasic']); \sort($codePoints['nonBasic']); $i = 0; $length = \mb_strlen($input, $this->encoding); while ($h < $length) { $m = $codePoints['nonBasic'][$i++]; $delta = $delta + ($m - $n) * ($h + 1); $n = $m; foreach ($codePoints['all'] as $c) { if ($c < $n || $c < static::INITIAL_N) { $delta++; } if ($c === $n) { $q = $delta; for ($k = static::BASE;; $k += static::BASE) { $t = $this->calculateThreshold($k, $bias); if ($q < $t) { break; } $code = $t + ($q - $t) % (static::BASE - $t); $output .= static::$encodeTable[$code]; $q = ($q - $t) / (static::BASE - $t); } $output .= static::$encodeTable[$q]; $bias = $this->adapt($delta, $h + 1, $h === $b); $delta = 0; $h++; } } $delta++; $n++; } $out = static::PREFIX . $output; $length = \strlen($out); if ($length > 63 || $length < 1) { throw new \Google\Site_Kit_Dependencies\TrueBV\Exception\LabelOutOfBoundsException(\sprintf('The length of any one label is limited to between 1 and 63 octets, but %s given.', $length)); } return $out; } /** * Decode a Punycode domain name to its Unicode counterpart * * @param string $input Domain name in Punycode * @return string Unicode domain name */ public function decode($input) { $input = \strtolower($input); $parts = \explode('.', $input); foreach ($parts as &$part) { $length = \strlen($part); if ($length > 63 || $length < 1) { throw new \Google\Site_Kit_Dependencies\TrueBV\Exception\LabelOutOfBoundsException(\sprintf('The length of any one label is limited to between 1 and 63 octets, but %s given.', $length)); } if (\strpos($part, static::PREFIX) !== 0) { continue; } $part = \substr($part, \strlen(static::PREFIX)); $part = $this->decodePart($part); } $output = \implode('.', $parts); $length = \strlen($output); if ($length > 255) { throw new \Google\Site_Kit_Dependencies\TrueBV\Exception\DomainOutOfBoundsException(\sprintf('A full domain name is limited to 255 octets (including the separators), %s given.', $length)); } return $output; } /** * Decode a part of domain name, such as tld * * @param string $input Part of a domain name * @return string Unicode domain part */ protected function decodePart($input) { $n = static::INITIAL_N; $i = 0; $bias = static::INITIAL_BIAS; $output = ''; $pos = \strrpos($input, static::DELIMITER); if ($pos !== \false) { $output = \substr($input, 0, $pos++); } else { $pos = 0; } $outputLength = \strlen($output); $inputLength = \strlen($input); while ($pos < $inputLength) { $oldi = $i; $w = 1; for ($k = static::BASE;; $k += static::BASE) { $digit = static::$decodeTable[$input[$pos++]]; $i = $i + $digit * $w; $t = $this->calculateThreshold($k, $bias); if ($digit < $t) { break; } $w = $w * (static::BASE - $t); } $bias = $this->adapt($i - $oldi, ++$outputLength, $oldi === 0); $n = $n + (int) ($i / $outputLength); $i = $i % $outputLength; $output = \mb_substr($output, 0, $i, $this->encoding) . $this->codePointToChar($n) . \mb_substr($output, $i, $outputLength - 1, $this->encoding); $i++; } return $output; } /** * Calculate the bias threshold to fall between TMIN and TMAX * * @param integer $k * @param integer $bias * @return integer */ protected function calculateThreshold($k, $bias) { if ($k <= $bias + static::TMIN) { return static::TMIN; } elseif ($k >= $bias + static::TMAX) { return static::TMAX; } return $k - $bias; } /** * Bias adaptation * * @param integer $delta * @param integer $numPoints * @param boolean $firstTime * @return integer */ protected function adapt($delta, $numPoints, $firstTime) { $delta = (int) ($firstTime ? $delta / static::DAMP : $delta / 2); $delta += (int) ($delta / $numPoints); $k = 0; while ($delta > (static::BASE - static::TMIN) * static::TMAX / 2) { $delta = (int) ($delta / (static::BASE - static::TMIN)); $k = $k + static::BASE; } $k = $k + (int) ((static::BASE - static::TMIN + 1) * $delta / ($delta + static::SKEW)); return $k; } /** * List code points for a given input * * @param string $input * @return array Multi-dimension array with basic, non-basic and aggregated code points */ protected function listCodePoints($input) { $codePoints = array('all' => array(), 'basic' => array(), 'nonBasic' => array()); $length = \mb_strlen($input, $this->encoding); for ($i = 0; $i < $length; $i++) { $char = \mb_substr($input, $i, 1, $this->encoding); $code = $this->charToCodePoint($char); if ($code < 128) { $codePoints['all'][] = $codePoints['basic'][] = $code; } else { $codePoints['all'][] = $codePoints['nonBasic'][] = $code; } } return $codePoints; } /** * Convert a single or multi-byte character to its code point * * @param string $char * @return integer */ protected function charToCodePoint($char) { $code = \ord($char[0]); if ($code < 128) { return $code; } elseif ($code < 224) { return ($code - 192) * 64 + (\ord($char[1]) - 128); } elseif ($code < 240) { return ($code - 224) * 4096 + (\ord($char[1]) - 128) * 64 + (\ord($char[2]) - 128); } else { return ($code - 240) * 262144 + (\ord($char[1]) - 128) * 4096 + (\ord($char[2]) - 128) * 64 + (\ord($char[3]) - 128); } } /** * Convert a code point to its single or multi-byte character * * @param integer $code * @return string */ protected function codePointToChar($code) { if ($code <= 0x7f) { return \chr($code); } elseif ($code <= 0x7ff) { return \chr(($code >> 6) + 192) . \chr(($code & 63) + 128); } elseif ($code <= 0xffff) { return \chr(($code >> 12) + 224) . \chr(($code >> 6 & 63) + 128) . \chr(($code & 63) + 128); } else { return \chr(($code >> 18) + 240) . \chr(($code >> 12 & 63) + 128) . \chr(($code >> 6 & 63) + 128) . \chr(($code & 63) + 128); } } }
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