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<?php namespace WpOrg\Requests; use WpOrg\Requests\Exception; use WpOrg\Requests\Exception\InvalidArgument; use WpOrg\Requests\Utility\InputValidator; /** * IDNA URL encoder * * Note: Not fully compliant, as nameprep does nothing yet. * * @package Requests\Utilities * * @link https://tools.ietf.org/html/rfc3490 IDNA specification * @link https://tools.ietf.org/html/rfc3492 Punycode/Bootstrap specification */ class IdnaEncoder { /** * ACE prefix used for IDNA * * @link https://tools.ietf.org/html/rfc3490#section-5 * @var string */ const ACE_PREFIX = 'xn--'; /** * Maximum length of a IDNA URL in ASCII. * * @see \WpOrg\Requests\IdnaEncoder::to_ascii() * * @since 2.0.0 * * @var int */ const MAX_LENGTH = 64; /**#@+ * Bootstrap constant for Punycode * * @link 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|Stringable $hostname Hostname * @return string Punycode-encoded hostname * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed argument is not a string or a stringable object. */ public static function encode($hostname) { if (InputValidator::is_string_or_stringable($hostname) === false) { throw InvalidArgument::create(1, '$hostname', 'string|Stringable', gettype($hostname)); } $parts = explode('.', $hostname); foreach ($parts as &$part) { $part = self::to_ascii($part); } return implode('.', $parts); } /** * Convert a UTF-8 text string to an ASCII string using Punycode * * @param string $text ASCII or UTF-8 string (max length 64 characters) * @return string ASCII string * * @throws \WpOrg\Requests\Exception Provided string longer than 64 ASCII characters (`idna.provided_too_long`) * @throws \WpOrg\Requests\Exception Prepared string longer than 64 ASCII characters (`idna.prepared_too_long`) * @throws \WpOrg\Requests\Exception Provided string already begins with xn-- (`idna.provided_is_prefixed`) * @throws \WpOrg\Requests\Exception Encoded string longer than 64 ASCII characters (`idna.encoded_too_long`) */ public static function to_ascii($text) { // Step 1: Check if the text is already ASCII if (self::is_ascii($text)) { // Skip to step 7 if (strlen($text) < self::MAX_LENGTH) { return $text; } throw new Exception('Provided string is too long', 'idna.provided_too_long', $text); } // Step 2: nameprep $text = self::nameprep($text); // Step 3: UseSTD3ASCIIRules is false, continue // Step 4: Check if it's ASCII now if (self::is_ascii($text)) { // Skip to step 7 /* * As the `nameprep()` method returns the original string, this code will never be reached until * that method is properly implemented. */ // @codeCoverageIgnoreStart if (strlen($text) < self::MAX_LENGTH) { return $text; } throw new Exception('Prepared string is too long', 'idna.prepared_too_long', $text); // @codeCoverageIgnoreEnd } // Step 5: Check ACE prefix if (strpos($text, self::ACE_PREFIX) === 0) { throw new Exception('Provided string begins with ACE prefix', 'idna.provided_is_prefixed', $text); } // Step 6: Encode with Punycode $text = self::punycode_encode($text); // Step 7: Prepend ACE prefix $text = self::ACE_PREFIX . $text; // Step 8: Check size if (strlen($text) < self::MAX_LENGTH) { return $text; } throw new Exception('Encoded string is too long', 'idna.encoded_too_long', $text); } /** * Check whether a given text string contains only ASCII characters * * @internal (Testing found regex was the fastest implementation) * * @param string $text Text to examine. * @return bool Is the text string ASCII-only? */ protected static function is_ascii($text) { return (preg_match('/(?:[^\x00-\x7F])/', $text) !== 1); } /** * Prepare a text string for use as an IDNA name * * @todo Implement this based on RFC 3491 and the newer 5891 * @param string $text Text to prepare. * @return string Prepared string */ protected static function nameprep($text) { return $text; } /** * Convert a UTF-8 string to a UCS-4 codepoint array * * Based on \WpOrg\Requests\Iri::replace_invalid_with_pct_encoding() * * @param string $input Text to convert. * @return array Unicode code points * * @throws \WpOrg\Requests\Exception Invalid UTF-8 codepoint (`idna.invalidcodepoint`) */ protected static function utf8_to_codepoints($input) { $codepoints = []; // Get number of bytes $strlen = strlen($input); // phpcs:ignore Generic.CodeAnalysis.JumbledIncrementer -- This is a deliberate choice. for ($position = 0; $position < $strlen; $position++) { $value = ord($input[$position]); if ((~$value & 0x80) === 0x80) { // One byte sequence: $character = $value; $length = 1; $remaining = 0; } elseif (($value & 0xE0) === 0xC0) { // Two byte sequence: $character = ($value & 0x1F) << 6; $length = 2; $remaining = 1; } elseif (($value & 0xF0) === 0xE0) { // Three byte sequence: $character = ($value & 0x0F) << 12; $length = 3; $remaining = 2; } elseif (($value & 0xF8) === 0xF0) { // Four byte sequence: $character = ($value & 0x07) << 18; $length = 4; $remaining = 3; } else { // Invalid byte: throw new Exception('Invalid Unicode codepoint', 'idna.invalidcodepoint', $value); } if ($remaining > 0) { if ($position + $length > $strlen) { throw new 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 Exception('Invalid Unicode codepoint', 'idna.invalidcodepoint', $character); } --$remaining; $character |= ($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 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 * * @param string $input UTF-8 encoded string to encode * @return string Punycode-encoded string * * @throws \WpOrg\Requests\Exception On character outside of the domain (never happens with Punycode) (`idna.character_outside_domain`) */ public static function punycode_encode($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 = 0; $b = 0; // see loop // copy them to the output in order $codepoints = self::utf8_to_codepoints($input); $extended = []; foreach ($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 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 $codepointcount = count($codepoints); while ($h < $codepointcount) { // 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 < $codepointcount; $num++) { $c = $codepoints[$num]; // if c < n then increment delta, fail on overflow if ($c < $n) { $delta++; } elseif ($c === $n) { // if c == n then begin // 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)) $digit = (int) ($t + (($q - $t) % (self::BOOTSTRAP_BASE - $t))); $output .= self::digit_to_char($digit); // let q = (q - t) div (base - t) $q = (int) floor(($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 * * @link https://tools.ietf.org/html/rfc3492#section-5 * * @param int $digit Digit in the range 0-35 * @return string Single character corresponding to digit * * @throws \WpOrg\Requests\Exception On invalid digit (`idna.invalid_digit`) */ protected static function digit_to_char($digit) { // @codeCoverageIgnoreStart // As far as I know, this never happens, but still good to be sure. if ($digit < 0 || $digit > 35) { throw new Exception(sprintf('Invalid digit %d', $digit), 'idna.invalid_digit', $digit); } // @codeCoverageIgnoreEnd $digits = 'abcdefghijklmnopqrstuvwxyz0123456789'; return substr($digits, $digit, 1); } /** * Adapt the bias * * @link https://tools.ietf.org/html/rfc3492#section-6.1 * @param int $delta * @param int $numpoints * @param bool $firsttime * @return int|float New bias * * function adapt(delta,numpoints,firsttime): */ protected static function adapt($delta, $numpoints, $firsttime) { // if firsttime then let delta = delta div damp if ($firsttime) { $delta = floor($delta / self::BOOTSTRAP_DAMP); } else { // else let delta = delta div 2 $delta = floor($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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Welcome to Capital GMC BUICK – REGINA

Thank you for choosing Capital GMC Buick | Regina, your premier certified Buick and GMC dealership proudly serving drivers in Regina and the surrounding communities. Whether you’re searching for a brand-new Buick or GMC vehicle or a meticulously inspected pre-owned model, we have a diverse selection to match your needs and lifestyle.

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