common.js
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'use strict'
/**
* A set of utilities borrowed from Node.js' _http_common.js
*/
/**
* Verifies that the given val is a valid HTTP token
* per the rules defined in RFC 7230
* See https://tools.ietf.org/html/rfc7230#section-3.2.6
*
* Allowed characters in an HTTP token:
* ^_`a-z 94-122
* A-Z 65-90
* - 45
* 0-9 48-57
* ! 33
* #$%&' 35-39
* *+ 42-43
* . 46
* | 124
* ~ 126
*
* This implementation of checkIsHttpToken() loops over the string instead of
* using a regular expression since the former is up to 180% faster with v8 4.9
* depending on the string length (the shorter the string, the larger the
* performance difference)
*
* Additionally, checkIsHttpToken() is currently designed to be inlinable by v8,
* so take care when making changes to the implementation so that the source
* code size does not exceed v8's default max_inlined_source_size setting.
**/
/* istanbul ignore next */
function isValidTokenChar (ch) {
if (ch >= 94 && ch <= 122) { return true }
if (ch >= 65 && ch <= 90) { return true }
if (ch === 45) { return true }
if (ch >= 48 && ch <= 57) { return true }
if (ch === 34 || ch === 40 || ch === 41 || ch === 44) { return false }
if (ch >= 33 && ch <= 46) { return true }
if (ch === 124 || ch === 126) { return true }
return false
}
/* istanbul ignore next */
function checkIsHttpToken (val) {
if (typeof val !== 'string' || val.length === 0) { return false }
if (!isValidTokenChar(val.charCodeAt(0))) { return false }
const len = val.length
if (len > 1) {
if (!isValidTokenChar(val.charCodeAt(1))) { return false }
if (len > 2) {
if (!isValidTokenChar(val.charCodeAt(2))) { return false }
if (len > 3) {
if (!isValidTokenChar(val.charCodeAt(3))) { return false }
for (var i = 4; i < len; i++) {
if (!isValidTokenChar(val.charCodeAt(i))) { return false }
}
}
}
}
return true
}
exports.checkIsHttpToken = checkIsHttpToken
/**
* True if val contains an invalid field-vchar
* field-value = *( field-content / obs-fold )
* field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ]
* field-vchar = VCHAR / obs-text
*
* checkInvalidHeaderChar() is currently designed to be inlinable by v8,
* so take care when making changes to the implementation so that the source
* code size does not exceed v8's default max_inlined_source_size setting.
**/
/* istanbul ignore next */
function checkInvalidHeaderChar (val) {
val += ''
if (val.length < 1) { return false }
var c = val.charCodeAt(0)
if ((c <= 31 && c !== 9) || c > 255 || c === 127) { return true }
if (val.length < 2) { return false }
c = val.charCodeAt(1)
if ((c <= 31 && c !== 9) || c > 255 || c === 127) { return true }
if (val.length < 3) { return false }
c = val.charCodeAt(2)
if ((c <= 31 && c !== 9) || c > 255 || c === 127) { return true }
for (var i = 3; i < val.length; ++i) {
c = val.charCodeAt(i)
if ((c <= 31 && c !== 9) || c > 255 || c === 127) { return true }
}
return false
}
exports.checkInvalidHeaderChar = checkInvalidHeaderChar