mirror of https://github.com/jkjoy/sunpeiwen.git
131 lines
3.4 KiB
JavaScript
131 lines
3.4 KiB
JavaScript
'use strict';
|
|
|
|
const { isUtf8 } = require('buffer');
|
|
|
|
//
|
|
// Allowed token characters:
|
|
//
|
|
// '!', '#', '$', '%', '&', ''', '*', '+', '-',
|
|
// '.', 0-9, A-Z, '^', '_', '`', a-z, '|', '~'
|
|
//
|
|
// tokenChars[32] === 0 // ' '
|
|
// tokenChars[33] === 1 // '!'
|
|
// tokenChars[34] === 0 // '"'
|
|
// ...
|
|
//
|
|
// prettier-ignore
|
|
const tokenChars = [
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0 - 15
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31
|
|
0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, // 32 - 47
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 48 - 63
|
|
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 64 - 79
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, // 80 - 95
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 96 - 111
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0 // 112 - 127
|
|
];
|
|
|
|
/**
|
|
* Checks if a status code is allowed in a close frame.
|
|
*
|
|
* @param {Number} code The status code
|
|
* @return {Boolean} `true` if the status code is valid, else `false`
|
|
* @public
|
|
*/
|
|
function isValidStatusCode(code) {
|
|
return (
|
|
(code >= 1000 &&
|
|
code <= 1014 &&
|
|
code !== 1004 &&
|
|
code !== 1005 &&
|
|
code !== 1006) ||
|
|
(code >= 3000 && code <= 4999)
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Checks if a given buffer contains only correct UTF-8.
|
|
* Ported from https://www.cl.cam.ac.uk/%7Emgk25/ucs/utf8_check.c by
|
|
* Markus Kuhn.
|
|
*
|
|
* @param {Buffer} buf The buffer to check
|
|
* @return {Boolean} `true` if `buf` contains only correct UTF-8, else `false`
|
|
* @public
|
|
*/
|
|
function _isValidUTF8(buf) {
|
|
const len = buf.length;
|
|
let i = 0;
|
|
|
|
while (i < len) {
|
|
if ((buf[i] & 0x80) === 0) {
|
|
// 0xxxxxxx
|
|
i++;
|
|
} else if ((buf[i] & 0xe0) === 0xc0) {
|
|
// 110xxxxx 10xxxxxx
|
|
if (
|
|
i + 1 === len ||
|
|
(buf[i + 1] & 0xc0) !== 0x80 ||
|
|
(buf[i] & 0xfe) === 0xc0 // Overlong
|
|
) {
|
|
return false;
|
|
}
|
|
|
|
i += 2;
|
|
} else if ((buf[i] & 0xf0) === 0xe0) {
|
|
// 1110xxxx 10xxxxxx 10xxxxxx
|
|
if (
|
|
i + 2 >= len ||
|
|
(buf[i + 1] & 0xc0) !== 0x80 ||
|
|
(buf[i + 2] & 0xc0) !== 0x80 ||
|
|
(buf[i] === 0xe0 && (buf[i + 1] & 0xe0) === 0x80) || // Overlong
|
|
(buf[i] === 0xed && (buf[i + 1] & 0xe0) === 0xa0) // Surrogate (U+D800 - U+DFFF)
|
|
) {
|
|
return false;
|
|
}
|
|
|
|
i += 3;
|
|
} else if ((buf[i] & 0xf8) === 0xf0) {
|
|
// 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
|
|
if (
|
|
i + 3 >= len ||
|
|
(buf[i + 1] & 0xc0) !== 0x80 ||
|
|
(buf[i + 2] & 0xc0) !== 0x80 ||
|
|
(buf[i + 3] & 0xc0) !== 0x80 ||
|
|
(buf[i] === 0xf0 && (buf[i + 1] & 0xf0) === 0x80) || // Overlong
|
|
(buf[i] === 0xf4 && buf[i + 1] > 0x8f) ||
|
|
buf[i] > 0xf4 // > U+10FFFF
|
|
) {
|
|
return false;
|
|
}
|
|
|
|
i += 4;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
module.exports = {
|
|
isValidStatusCode,
|
|
isValidUTF8: _isValidUTF8,
|
|
tokenChars
|
|
};
|
|
|
|
if (isUtf8) {
|
|
module.exports.isValidUTF8 = function (buf) {
|
|
return buf.length < 24 ? _isValidUTF8(buf) : isUtf8(buf);
|
|
};
|
|
} /* istanbul ignore else */ else if (!process.env.WS_NO_UTF_8_VALIDATE) {
|
|
try {
|
|
const isValidUTF8 = require('utf-8-validate');
|
|
|
|
module.exports.isValidUTF8 = function (buf) {
|
|
return buf.length < 32 ? _isValidUTF8(buf) : isValidUTF8(buf);
|
|
};
|
|
} catch (e) {
|
|
// Continue regardless of the error.
|
|
}
|
|
}
|