spb/admin-ka

1'use strict';23const { isUtf8 } = require('buffer');45const { hasBlob } = require('./constants');67//8// Allowed token characters:9//10// '!', '#', '$', '%', '&', ''', '*', '+', '-',11// '.', 0-9, A-Z, '^', '_', '`', a-z, '|', '~'12//13// tokenChars[32] === 0 // ' '14// tokenChars[33] === 1 // '!'15// tokenChars[34] === 0 // '"'16// ...17//18// prettier-ignore19const tokenChars = [20  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0 - 1521  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 3122  0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, // 32 - 4723  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 48 - 6324  0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 64 - 7925  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, // 80 - 9526  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 96 - 11127  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0 // 112 - 12728];2930/**31 * Checks if a status code is allowed in a close frame.32 *33 * @param {Number} code The status code34 * @return {Boolean} `true` if the status code is valid, else `false`35 * @public36 */37function isValidStatusCode(code) {38  return (39    (code >= 1000 &&40      code <= 1014 &&41      code !== 1004 &&42      code !== 1005 &&43      code !== 1006) ||44    (code >= 3000 && code <= 4999)45  );46}4748/**49 * Checks if a given buffer contains only correct UTF-8.50 * Ported from https://www.cl.cam.ac.uk/%7Emgk25/ucs/utf8_check.c by51 * Markus Kuhn.52 *53 * @param {Buffer} buf The buffer to check54 * @return {Boolean} `true` if `buf` contains only correct UTF-8, else `false`55 * @public56 */57function _isValidUTF8(buf) {58  const len = buf.length;59  let i = 0;6061  while (i < len) {62    if ((buf[i] & 0x80) === 0) {63      // 0xxxxxxx64      i++;65    } else if ((buf[i] & 0xe0) === 0xc0) {66      // 110xxxxx 10xxxxxx67      if (68        i + 1 === len ||69        (buf[i + 1] & 0xc0) !== 0x80 ||70        (buf[i] & 0xfe) === 0xc0 // Overlong71      ) {72        return false;73      }7475      i += 2;76    } else if ((buf[i] & 0xf0) === 0xe0) {77      // 1110xxxx 10xxxxxx 10xxxxxx78      if (79        i + 2 >= len ||80        (buf[i + 1] & 0xc0) !== 0x80 ||81        (buf[i + 2] & 0xc0) !== 0x80 ||82        (buf[i] === 0xe0 && (buf[i + 1] & 0xe0) === 0x80) || // Overlong83        (buf[i] === 0xed && (buf[i + 1] & 0xe0) === 0xa0) // Surrogate (U+D800 - U+DFFF)84      ) {85        return false;86      }8788      i += 3;89    } else if ((buf[i] & 0xf8) === 0xf0) {90      // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx91      if (92        i + 3 >= len ||93        (buf[i + 1] & 0xc0) !== 0x80 ||94        (buf[i + 2] & 0xc0) !== 0x80 ||95        (buf[i + 3] & 0xc0) !== 0x80 ||96        (buf[i] === 0xf0 && (buf[i + 1] & 0xf0) === 0x80) || // Overlong97        (buf[i] === 0xf4 && buf[i + 1] > 0x8f) ||98        buf[i] > 0xf4 // > U+10FFFF99      ) {100        return false;101      }102103      i += 4;104    } else {105      return false;106    }107  }108109  return true;110}111112/**113 * Determines whether a value is a `Blob`.114 *115 * @param {*} value The value to be tested116 * @return {Boolean} `true` if `value` is a `Blob`, else `false`117 * @private118 */119function isBlob(value) {120  return (121    hasBlob &&122    typeof value === 'object' &&123    typeof value.arrayBuffer === 'function' &&124    typeof value.type === 'string' &&125    typeof value.stream === 'function' &&126    (value[Symbol.toStringTag] === 'Blob' ||127      value[Symbol.toStringTag] === 'File')128  );129}130131module.exports = {132  isBlob,133  isValidStatusCode,134  isValidUTF8: _isValidUTF8,135  tokenChars136};137138if (isUtf8) {139  module.exports.isValidUTF8 = function (buf) {140    return buf.length < 24 ? _isValidUTF8(buf) : isUtf8(buf);141  };142} /* istanbul ignore else  */ else if (!process.env.WS_NO_UTF_8_VALIDATE) {143  try {144    const isValidUTF8 = require('utf-8-validate');145146    module.exports.isValidUTF8 = function (buf) {147      return buf.length < 32 ? _isValidUTF8(buf) : isValidUTF8(buf);148    };149  } catch (e) {150    // Continue regardless of the error.151  }152}153