105 lines
2.4 KiB
JavaScript
105 lines
2.4 KiB
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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;
|
||
|
|
}
|
||
|
|
|
||
|
|
try {
|
||
|
|
let isValidUTF8 = require('utf-8-validate');
|
||
|
|
|
||
|
|
/* istanbul ignore if */
|
||
|
|
if (typeof isValidUTF8 === 'object') {
|
||
|
|
isValidUTF8 = isValidUTF8.Validation.isValidUTF8; // utf-8-validate@<3.0.0
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
isValidStatusCode,
|
||
|
|
isValidUTF8(buf) {
|
||
|
|
return buf.length < 150 ? _isValidUTF8(buf) : isValidUTF8(buf);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
} catch (e) /* istanbul ignore next */ {
|
||
|
|
module.exports = {
|
||
|
|
isValidStatusCode,
|
||
|
|
isValidUTF8: _isValidUTF8
|
||
|
|
};
|
||
|
|
}
|