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Edit File : IDNAEncoder.php \| Size : 11.06 KB
<?php /** * IDNA URL encoder * * Note: Not fully compliant, as nameprep does nothing yet. * * @package Requests * @subpackage Utilities * @see https://tools.ietf.org/html/rfc3490 IDNA specification * @see https://tools.ietf.org/html/rfc3492 Punycode/Bootstrap specification / class Requests_IDNAEncoder { /* * ACE prefix used for IDNA * * @see https://tools.ietf.org/html/rfc3490#section-5 * @var string / const ACE_PREFIX = 'xn--'; /#@+ Bootstrap constant for Punycode * * @see https://tools.ietf.org/html/rfc3492#section-5 * @var int / const BOOTSTRAP_BASE = 36; const BOOTSTRAP_TMIN = 1; const BOOTSTRAP_TMAX = 26; const BOOTSTRAP_SKEW = 38; const BOOTSTRAP_DAMP = 700; const BOOTSTRAP_INITIAL_BIAS = 72; const BOOTSTRAP_INITIAL_N = 128; /#@-/ /** * Encode a hostname using Punycode * * @param string $string Hostname * @return string Punycode-encoded hostname / public static function encode($string) { $parts = explode('.', $string); foreach ($parts as &$part) { $part = self::to_ascii($part); } return implode('.', $parts); } /* * Convert a UTF-8 string to an ASCII string using Punycode * * @throws Requests_Exception Provided string longer than 64 ASCII characters (`idna.provided_too_long`) * @throws Requests_Exception Prepared string longer than 64 ASCII characters (`idna.prepared_too_long`) * @throws Requests_Exception Provided string already begins with xn-- (`idna.provided_is_prefixed`) * @throws Requests_Exception Encoded string longer than 64 ASCII characters (`idna.encoded_too_long`) * * @param string $string ASCII or UTF-8 string (max length 64 characters) * @return string ASCII string / public static function to_ascii($string) { // Step 1: Check if the string is already ASCII if (self::is_ascii($string)) { // Skip to step 7 if (strlen($string) < 64) { return $string; } throw new Requests_Exception('Provided string is too long', 'idna.provided_too_long', $string); } // Step 2: nameprep $string = self::nameprep($string); // Step 3: UseSTD3ASCIIRules is false, continue // Step 4: Check if it's ASCII now if (self::is_ascii($string)) { // Skip to step 7 if (strlen($string) < 64) { return $string; } throw new Requests_Exception('Prepared string is too long', 'idna.prepared_too_long', $string); } // Step 5: Check ACE prefix if (strpos($string, self::ACE_PREFIX) === 0) { throw new Requests_Exception('Provided string begins with ACE prefix', 'idna.provided_is_prefixed', $string); } // Step 6: Encode with Punycode $string = self::punycode_encode($string); // Step 7: Prepend ACE prefix $string = self::ACE_PREFIX . $string; // Step 8: Check size if (strlen($string) < 64) { return $string; } throw new Requests_Exception('Encoded string is too long', 'idna.encoded_too_long', $string); } /* * Check whether a given string contains only ASCII characters * * @internal (Testing found regex was the fastest implementation) * * @param string $string * @return bool Is the string ASCII-only? / protected static function is_ascii($string) { return (preg_match('/(?:[^\x00-\x7F])/', $string) !== 1); } /* * Prepare a string for use as an IDNA name * * @todo Implement this based on RFC 3491 and the newer 5891 * @param string $string * @return string Prepared string / protected static function nameprep($string) { return $string; } /* * Convert a UTF-8 string to a UCS-4 codepoint array * * Based on Requests_IRI::replace_invalid_with_pct_encoding() * * @throws Requests_Exception Invalid UTF-8 codepoint (`idna.invalidcodepoint`) * @param string $input * @return array Unicode code points / protected static function utf8_to_codepoints($input) { $codepoints = array(); // Get number of bytes $strlen = strlen($input); for ($position = 0; $position < $strlen; $position++) { $value = ord($input[$position]); // One byte sequence: if ((~$value & 0x80) === 0x80) { $character = $value; $length = 1; $remaining = 0; } // Two byte sequence: elseif (($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 { throw new Requests_Exception('Invalid Unicode codepoint', 'idna.invalidcodepoint', $value); } if ($remaining > 0) { if ($position + $length > $strlen) { throw new Requests_Exception('Invalid Unicode codepoint', 'idna.invalidcodepoint', $character); } for ($position++; $remaining > 0; $position++) { $value = ord($input[$position]); // If it is invalid, count the sequence as invalid and reprocess the current byte: if (($value & 0xC0) !== 0x80) { throw new Requests_Exception('Invalid Unicode codepoint', 'idna.invalidcodepoint', $character); } $character \|= ($value & 0x3F) << (--$remaining 6); } $position--; } if ( // 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 < 0x20 \|\| $character > 0x7E && $character < 0xA0 \|\| $character > 0xEFFFD ) ) { throw new Requests_Exception('Invalid Unicode codepoint', 'idna.invalidcodepoint', $character); } $codepoints[] = $character; } return $codepoints; } /** * RFC3492-compliant encoder * * @internal Pseudo-code from Section 6.3 is commented with "#" next to relevant code * @throws Requests_Exception On character outside of the domain (never happens with Punycode) (`idna.character_outside_domain`) * * @param string $input UTF-8 encoded string to encode * @return string Punycode-encoded string / public static function punycode_encode($input) { $output = ''; # let n = initial_n $n = self::BOOTSTRAP_INITIAL_N; # let delta = 0 $delta = 0; # let bias = initial_bias $bias = self::BOOTSTRAP_INITIAL_BIAS; # let h = b = the number of basic code points in the input $h = $b = 0; // see loop # copy them to the output in order $codepoints = self::utf8_to_codepoints($input); $extended = array(); foreach ($codepoints as $char) { if ($char < 128) { // Character is valid ASCII // TODO: this should also check if it's valid for a URL $output .= chr($char); $h++; } // Check if the character is non-ASCII, but below initial n // This never occurs for Punycode, so ignore in coverage // @codeCoverageIgnoreStart elseif ($char < $n) { throw new Requests_Exception('Invalid character', 'idna.character_outside_domain', $char); } // @codeCoverageIgnoreEnd else { $extended[$char] = true; } } $extended = array_keys($extended); sort($extended); $b = $h; # [copy them] followed by a delimiter if b > 0 if (strlen($output) > 0) { $output .= '-'; } # {if the input contains a non-basic code point < n then fail} # while h < length(input) do begin while ($h < count($codepoints)) { # let m = the minimum code point >= n in the input $m = array_shift($extended); //printf('next code point to insert is %s' . PHP_EOL, dechex($m)); # let delta = delta + (m - n) (h + 1), fail on overflow $delta += ($m - $n) * ($h + 1); # let n = m $n = $m; # for each code point c in the input (in order) do begin for ($num = 0; $num < count($codepoints); $num++) { $c = $codepoints[$num]; # if c < n then increment delta, fail on overflow if ($c < $n) { $delta++; } # if c == n then begin elseif ($c === $n) { # let q = delta $q = $delta; # for k = base to infinity in steps of base do begin for ($k = self::BOOTSTRAP_BASE; ; $k += self::BOOTSTRAP_BASE) { # let t = tmin if k <= bias {+ tmin}, or # tmax if k >= bias + tmax, or k - bias otherwise if ($k <= ($bias + self::BOOTSTRAP_TMIN)) { $t = self::BOOTSTRAP_TMIN; } elseif ($k >= ($bias + self::BOOTSTRAP_TMAX)) { $t = self::BOOTSTRAP_TMAX; } else { $t = $k - $bias; } # if q < t then break if ($q < $t) { break; } # output the code point for digit t + ((q - t) mod (base - t)) $digit = $t + (($q - $t) % (self::BOOTSTRAP_BASE - $t)); $output .= self::digit_to_char($digit); # let q = (q - t) div (base - t) $q = floor(($q - $t) / (self::BOOTSTRAP_BASE - $t)); # end } # output the code point for digit q $output .= self::digit_to_char($q); # let bias = adapt(delta, h + 1, test h equals b?) $bias = self::adapt($delta, $h + 1, $h === $b); # let delta = 0 $delta = 0; # increment h $h++; # end } # end } # increment delta and n $delta++; $n++; # end } return $output; } /** * Convert a digit to its respective character * * @see https://tools.ietf.org/html/rfc3492#section-5 * @throws Requests_Exception On invalid digit (`idna.invalid_digit`) * * @param int $digit Digit in the range 0-35 * @return string Single character corresponding to digit / protected static function digit_to_char($digit) { // @codeCoverageIgnoreStart // As far as I know, this never happens, but still good to be sure. if ($digit < 0 \|\| $digit > 35) { throw new Requests_Exception(sprintf('Invalid digit %d', $digit), 'idna.invalid_digit', $digit); } // @codeCoverageIgnoreEnd $digits = 'abcdefghijklmnopqrstuvwxyz0123456789'; return substr($digits, $digit, 1); } /* * Adapt the bias * * @see https://tools.ietf.org/html/rfc3492#section-6.1 * @param int $delta * @param int $numpoints * @param bool $firsttime * @return int New bias / protected static function adapt($delta, $numpoints, $firsttime) { # function adapt(delta,numpoints,firsttime): # if firsttime then let delta = delta div damp if ($firsttime) { $delta = floor($delta / self::BOOTSTRAP_DAMP); } # else let delta = delta div 2 else { $delta = floor($delta / 2); } # let delta = delta + (delta div numpoints) $delta += floor($delta / $numpoints); # let k = 0 $k = 0; # while delta > ((base - tmin) tmax) div 2 do begin $max = floor(((self::BOOTSTRAP_BASE - self::BOOTSTRAP_TMIN) * self::BOOTSTRAP_TMAX) / 2); while ($delta > $max) { # let delta = delta div (base - tmin) $delta = floor($delta / (self::BOOTSTRAP_BASE - self::BOOTSTRAP_TMIN)); # let k = k + base $k += self::BOOTSTRAP_BASE; # end } # return k + (((base - tmin + 1) * delta) div (delta + skew)) return $k + floor(((self::BOOTSTRAP_BASE - self::BOOTSTRAP_TMIN + 1) * $delta) / ($delta + self::BOOTSTRAP_SKEW)); } } Back

Edit File : IDNAEncoder.php | Size : 11.06 KB

<?php

/**
 * IDNA URL encoder
 *
 * Note: Not fully compliant, as nameprep does nothing yet.
 *
 * @package Requests
 * @subpackage Utilities
 * @see https://tools.ietf.org/html/rfc3490 IDNA specification
 * @see https://tools.ietf.org/html/rfc3492 Punycode/Bootstrap specification
 */
class Requests_IDNAEncoder {
	/**
	 * ACE prefix used for IDNA
	 *
	 * @see https://tools.ietf.org/html/rfc3490#section-5
	 * @var string
	 */
	const ACE_PREFIX = 'xn--';

/**#@+
	 * Bootstrap constant for Punycode
	 *
	 * @see https://tools.ietf.org/html/rfc3492#section-5
	 * @var int
	 */
	const BOOTSTRAP_BASE         = 36;
	const BOOTSTRAP_TMIN         = 1;
	const BOOTSTRAP_TMAX         = 26;
	const BOOTSTRAP_SKEW         = 38;
	const BOOTSTRAP_DAMP         = 700;
	const BOOTSTRAP_INITIAL_BIAS = 72;
	const BOOTSTRAP_INITIAL_N    = 128;
	/**#@-*/

/**
	 * Encode a hostname using Punycode
	 *
	 * @param string $string Hostname
	 * @return string Punycode-encoded hostname
	 */
	public static function encode($string) {
		$parts = explode('.', $string);
		foreach ($parts as &$part) {
			$part = self::to_ascii($part);
		}
		return implode('.', $parts);
	}

/**
	 * Convert a UTF-8 string to an ASCII string using Punycode
	 *
	 * @throws Requests_Exception Provided string longer than 64 ASCII characters (`idna.provided_too_long`)
	 * @throws Requests_Exception Prepared string longer than 64 ASCII characters (`idna.prepared_too_long`)
	 * @throws Requests_Exception Provided string already begins with xn-- (`idna.provided_is_prefixed`)
	 * @throws Requests_Exception Encoded string longer than 64 ASCII characters (`idna.encoded_too_long`)
	 *
	 * @param string $string ASCII or UTF-8 string (max length 64 characters)
	 * @return string ASCII string
	 */
	public static function to_ascii($string) {
		// Step 1: Check if the string is already ASCII
		if (self::is_ascii($string)) {
			// Skip to step 7
			if (strlen($string) < 64) {
				return $string;
			}

throw new Requests_Exception('Provided string is too long', 'idna.provided_too_long', $string);
		}

// Step 2: nameprep
		$string = self::nameprep($string);

// Step 3: UseSTD3ASCIIRules is false, continue
		// Step 4: Check if it's ASCII now
		if (self::is_ascii($string)) {
			// Skip to step 7
			if (strlen($string) < 64) {
				return $string;
			}

throw new Requests_Exception('Prepared string is too long', 'idna.prepared_too_long', $string);
		}

// Step 5: Check ACE prefix
		if (strpos($string, self::ACE_PREFIX) === 0) {
			throw new Requests_Exception('Provided string begins with ACE prefix', 'idna.provided_is_prefixed', $string);
		}

// Step 6: Encode with Punycode
		$string = self::punycode_encode($string);

// Step 7: Prepend ACE prefix
		$string = self::ACE_PREFIX . $string;

// Step 8: Check size
		if (strlen($string) < 64) {
			return $string;
		}

throw new Requests_Exception('Encoded string is too long', 'idna.encoded_too_long', $string);
	}

/**
	 * Check whether a given string contains only ASCII characters
	 *
	 * @internal (Testing found regex was the fastest implementation)
	 *
	 * @param string $string
	 * @return bool Is the string ASCII-only?
	 */
	protected static function is_ascii($string) {
		return (preg_match('/(?:[^\x00-\x7F])/', $string) !== 1);
	}

/**
	 * Prepare a string for use as an IDNA name
	 *
	 * @todo Implement this based on RFC 3491 and the newer 5891
	 * @param string $string
	 * @return string Prepared string
	 */
	protected static function nameprep($string) {
		return $string;
	}

/**
	 * Convert a UTF-8 string to a UCS-4 codepoint array
	 *
	 * Based on Requests_IRI::replace_invalid_with_pct_encoding()
	 *
	 * @throws Requests_Exception Invalid UTF-8 codepoint (`idna.invalidcodepoint`)
	 * @param string $input
	 * @return array Unicode code points
	 */
	protected static function utf8_to_codepoints($input) {
		$codepoints = array();

// Get number of bytes
		$strlen = strlen($input);

for ($position = 0; $position < $strlen; $position++) {
			$value = ord($input[$position]);

// One byte sequence:
			if ((~$value & 0x80) === 0x80) {
				$character = $value;
				$length = 1;
				$remaining = 0;
			}
			// Two byte sequence:
			elseif (($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 {
				throw new Requests_Exception('Invalid Unicode codepoint', 'idna.invalidcodepoint', $value);
			}

if ($remaining > 0) {
				if ($position + $length > $strlen) {
					throw new Requests_Exception('Invalid Unicode codepoint', 'idna.invalidcodepoint', $character);
				}
				for ($position++; $remaining > 0; $position++) {
					$value = ord($input[$position]);

// If it is invalid, count the sequence as invalid and reprocess the current byte:
					if (($value & 0xC0) !== 0x80) {
						throw new Requests_Exception('Invalid Unicode codepoint', 'idna.invalidcodepoint', $character);
					}

$character |= ($value & 0x3F) << (--$remaining * 6);
				}
				$position--;
			}

if (
				// 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 < 0x20
					|| $character > 0x7E && $character < 0xA0
					|| $character > 0xEFFFD
				)
			) {
				throw new Requests_Exception('Invalid Unicode codepoint', 'idna.invalidcodepoint', $character);
			}

$codepoints[] = $character;
		}

return $codepoints;
	}

/**
	 * RFC3492-compliant encoder
	 *
	 * @internal Pseudo-code from Section 6.3 is commented with "#" next to relevant code
	 * @throws Requests_Exception On character outside of the domain (never happens with Punycode) (`idna.character_outside_domain`)
	 *
	 * @param string $input UTF-8 encoded string to encode
	 * @return string Punycode-encoded string
	 */
	public static function punycode_encode($input) {
		$output = '';
#		let n = initial_n
		$n = self::BOOTSTRAP_INITIAL_N;
#		let delta = 0
		$delta = 0;
#		let bias = initial_bias
		$bias = self::BOOTSTRAP_INITIAL_BIAS;
#		let h = b = the number of basic code points in the input
		$h = $b = 0; // see loop
#		copy them to the output in order
		$codepoints = self::utf8_to_codepoints($input);
		$extended = array();

foreach ($codepoints as $char) {
			if ($char < 128) {
				// Character is valid ASCII
				// TODO: this should also check if it's valid for a URL
				$output .= chr($char);
				$h++;
			}
			// Check if the character is non-ASCII, but below initial n
			// This never occurs for Punycode, so ignore in coverage
			// @codeCoverageIgnoreStart
			elseif ($char < $n) {
				throw new Requests_Exception('Invalid character', 'idna.character_outside_domain', $char);
			}
			// @codeCoverageIgnoreEnd
			else {
				$extended[$char] = true;
			}
		}
		$extended = array_keys($extended);
		sort($extended);
		$b = $h;
#		[copy them] followed by a delimiter if b > 0
		if (strlen($output) > 0) {
			$output .= '-';
		}
#		{if the input contains a non-basic code point < n then fail}
#		while h < length(input) do begin
		while ($h < count($codepoints)) {
#			let m = the minimum code point >= n in the input
			$m = array_shift($extended);
			//printf('next code point to insert is %s' . PHP_EOL, dechex($m));
#			let delta = delta + (m - n) * (h + 1), fail on overflow
			$delta += ($m - $n) * ($h + 1);
#			let n = m
			$n = $m;
#			for each code point c in the input (in order) do begin
			for ($num = 0; $num < count($codepoints); $num++) {
				$c = $codepoints[$num];
#				if c < n then increment delta, fail on overflow
				if ($c < $n) {
					$delta++;
				}
#				if c == n then begin
				elseif ($c === $n) {
#					let q = delta
					$q = $delta;
#					for k = base to infinity in steps of base do begin
					for ($k = self::BOOTSTRAP_BASE; ; $k += self::BOOTSTRAP_BASE) {
#						let t = tmin if k <= bias {+ tmin}, or
#								tmax if k >= bias + tmax, or k - bias otherwise
						if ($k <= ($bias + self::BOOTSTRAP_TMIN)) {
							$t = self::BOOTSTRAP_TMIN;
						}
						elseif ($k >= ($bias + self::BOOTSTRAP_TMAX)) {
							$t = self::BOOTSTRAP_TMAX;
						}
						else {
							$t = $k - $bias;
						}
#						if q < t then break
						if ($q < $t) {
							break;
						}
#						output the code point for digit t + ((q - t) mod (base - t))
						$digit = $t + (($q - $t) % (self::BOOTSTRAP_BASE - $t));
						$output .= self::digit_to_char($digit);
#						let q = (q - t) div (base - t)
						$q = floor(($q - $t) / (self::BOOTSTRAP_BASE - $t));
#					end
					}
#					output the code point for digit q
					$output .= self::digit_to_char($q);
#					let bias = adapt(delta, h + 1, test h equals b?)
					$bias = self::adapt($delta, $h + 1, $h === $b);
#					let delta = 0
					$delta = 0;
#					increment h
					$h++;
#				end
				}
#			end
			}
#			increment delta and n
			$delta++;
			$n++;
#		end
		}

return $output;
	}

/**
	 * Convert a digit to its respective character
	 *
	 * @see https://tools.ietf.org/html/rfc3492#section-5
	 * @throws Requests_Exception On invalid digit (`idna.invalid_digit`)
	 *
	 * @param int $digit Digit in the range 0-35
	 * @return string Single character corresponding to digit
	 */
	protected static function digit_to_char($digit) {
		// @codeCoverageIgnoreStart
		// As far as I know, this never happens, but still good to be sure.
		if ($digit < 0 || $digit > 35) {
			throw new Requests_Exception(sprintf('Invalid digit %d', $digit), 'idna.invalid_digit', $digit);
		}
		// @codeCoverageIgnoreEnd
		$digits = 'abcdefghijklmnopqrstuvwxyz0123456789';
		return substr($digits, $digit, 1);
	}

/**
	 * Adapt the bias
	 *
	 * @see https://tools.ietf.org/html/rfc3492#section-6.1
	 * @param int $delta
	 * @param int $numpoints
	 * @param bool $firsttime
	 * @return int New bias
	 */
	protected static function adapt($delta, $numpoints, $firsttime) {
#	function adapt(delta,numpoints,firsttime):
#		if firsttime then let delta = delta div damp
		if ($firsttime) {
			$delta = floor($delta / self::BOOTSTRAP_DAMP);
		}
#		else let delta = delta div 2
		else {
			$delta = floor($delta / 2);
		}
#		let delta = delta + (delta div numpoints)
		$delta += floor($delta / $numpoints);
#		let k = 0
		$k = 0;
#		while delta > ((base - tmin) * tmax) div 2 do begin
		$max = floor(((self::BOOTSTRAP_BASE - self::BOOTSTRAP_TMIN) * self::BOOTSTRAP_TMAX) / 2);
		while ($delta > $max) {
#			let delta = delta div (base - tmin)
			$delta = floor($delta / (self::BOOTSTRAP_BASE - self::BOOTSTRAP_TMIN));
#			let k = k + base
			$k += self::BOOTSTRAP_BASE;
#		end
		}
#		return k + (((base - tmin + 1) * delta) div (delta + skew))
		return $k + floor(((self::BOOTSTRAP_BASE - self::BOOTSTRAP_TMIN + 1) * $delta) / ($delta + self::BOOTSTRAP_SKEW));
	}
}

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