undici
Version:
An HTTP/1.1 client, written from scratch for Node.js
654 lines (619 loc) • 19.8 kB
JavaScript
'use strict'
/**
* @see https://www.rfc-editor.org/rfc/rfc9110.html#name-date-time-formats
*
* @param {string} date
* @returns {Date | undefined}
*/
function parseHttpDate (date) {
// Sun, 06 Nov 1994 08:49:37 GMT ; IMF-fixdate
// Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
// Sunday, 06-Nov-94 08:49:37 GMT ; obsolete RFC 850 format
switch (date[3]) {
case ',': return parseImfDate(date)
case ' ': return parseAscTimeDate(date)
default: return parseRfc850Date(date)
}
}
/**
* @see https://httpwg.org/specs/rfc9110.html#preferred.date.format
*
* @param {string} date
* @returns {Date | undefined}
*/
function parseImfDate (date) {
if (
date.length !== 29 ||
date[4] !== ' ' ||
date[7] !== ' ' ||
date[11] !== ' ' ||
date[16] !== ' ' ||
date[19] !== ':' ||
date[22] !== ':' ||
date[25] !== ' ' ||
date[26] !== 'G' ||
date[27] !== 'M' ||
date[28] !== 'T'
) {
return undefined
}
let weekday = -1
if (date[0] === 'S' && date[1] === 'u' && date[2] === 'n') { // Sunday
weekday = 0
} else if (date[0] === 'M' && date[1] === 'o' && date[2] === 'n') { // Monday
weekday = 1
} else if (date[0] === 'T' && date[1] === 'u' && date[2] === 'e') { // Tuesday
weekday = 2
} else if (date[0] === 'W' && date[1] === 'e' && date[2] === 'd') { // Wednesday
weekday = 3
} else if (date[0] === 'T' && date[1] === 'h' && date[2] === 'u') { // Thursday
weekday = 4
} else if (date[0] === 'F' && date[1] === 'r' && date[2] === 'i') { // Friday
weekday = 5
} else if (date[0] === 'S' && date[1] === 'a' && date[2] === 't') { // Saturday
weekday = 6
} else {
return undefined // Not a valid day of the week
}
let day = 0
if (date[5] === '0') {
// Single digit day, e.g. "Sun Nov 6 08:49:37 1994"
const code = date.charCodeAt(6)
if (code < 49 || code > 57) {
return undefined // Not a digit
}
day = code - 48 // Convert ASCII code to number
} else {
const code1 = date.charCodeAt(5)
if (code1 < 49 || code1 > 51) {
return undefined // Not a digit between 1 and 3
}
const code2 = date.charCodeAt(6)
if (code2 < 48 || code2 > 57) {
return undefined // Not a digit
}
day = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number
}
let monthIdx = -1
if (
(date[8] === 'J' && date[9] === 'a' && date[10] === 'n')
) {
monthIdx = 0 // Jan
} else if (
(date[8] === 'F' && date[9] === 'e' && date[10] === 'b')
) {
monthIdx = 1 // Feb
} else if (
(date[8] === 'M' && date[9] === 'a')
) {
if (date[10] === 'r') {
monthIdx = 2 // Mar
} else if (date[10] === 'y') {
monthIdx = 4 // May
} else {
return undefined // Invalid month
}
} else if (
(date[8] === 'J')
) {
if (date[9] === 'a' && date[10] === 'n') {
monthIdx = 0 // Jan
} else if (date[9] === 'u') {
if (date[10] === 'n') {
monthIdx = 5 // Jun
} else if (date[10] === 'l') {
monthIdx = 6 // Jul
} else {
return undefined // Invalid month
}
} else {
return undefined // Invalid month
}
} else if (
(date[8] === 'A')
) {
if (date[9] === 'p' && date[10] === 'r') {
monthIdx = 3 // Apr
} else if (date[9] === 'u' && date[10] === 'g') {
monthIdx = 7 // Aug
} else {
return undefined // Invalid month
}
} else if (
(date[8] === 'S' && date[9] === 'e' && date[10] === 'p')
) {
monthIdx = 8 // Sep
} else if (
(date[8] === 'O' && date[9] === 'c' && date[10] === 't')
) {
monthIdx = 9 // Oct
} else if (
(date[8] === 'N' && date[9] === 'o' && date[10] === 'v')
) {
monthIdx = 10 // Nov
} else if (
(date[8] === 'D' && date[9] === 'e' && date[10] === 'c')
) {
monthIdx = 11 // Dec
} else {
// Not a valid month
return undefined
}
const yearDigit1 = date.charCodeAt(12)
if (yearDigit1 < 48 || yearDigit1 > 57) {
return undefined // Not a digit
}
const yearDigit2 = date.charCodeAt(13)
if (yearDigit2 < 48 || yearDigit2 > 57) {
return undefined // Not a digit
}
const yearDigit3 = date.charCodeAt(14)
if (yearDigit3 < 48 || yearDigit3 > 57) {
return undefined // Not a digit
}
const yearDigit4 = date.charCodeAt(15)
if (yearDigit4 < 48 || yearDigit4 > 57) {
return undefined // Not a digit
}
const year = (yearDigit1 - 48) * 1000 + (yearDigit2 - 48) * 100 + (yearDigit3 - 48) * 10 + (yearDigit4 - 48)
let hour = 0
if (date[17] === '0') {
const code = date.charCodeAt(18)
if (code < 48 || code > 57) {
return undefined // Not a digit
}
hour = code - 48 // Convert ASCII code to number
} else {
const code1 = date.charCodeAt(17)
if (code1 < 48 || code1 > 50) {
return undefined // Not a digit between 0 and 2
}
const code2 = date.charCodeAt(18)
if (code2 < 48 || code2 > 57) {
return undefined // Not a digit
}
if (code1 === 50 && code2 > 51) {
return undefined // Hour cannot be greater than 23
}
hour = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number
}
let minute = 0
if (date[20] === '0') {
const code = date.charCodeAt(21)
if (code < 48 || code > 57) {
return undefined // Not a digit
}
minute = code - 48 // Convert ASCII code to number
} else {
const code1 = date.charCodeAt(20)
if (code1 < 48 || code1 > 53) {
return undefined // Not a digit between 0 and 5
}
const code2 = date.charCodeAt(21)
if (code2 < 48 || code2 > 57) {
return undefined // Not a digit
}
minute = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number
}
let second = 0
if (date[23] === '0') {
const code = date.charCodeAt(24)
if (code < 48 || code > 57) {
return undefined // Not a digit
}
second = code - 48 // Convert ASCII code to number
} else {
const code1 = date.charCodeAt(23)
if (code1 < 48 || code1 > 53) {
return undefined // Not a digit between 0 and 5
}
const code2 = date.charCodeAt(24)
if (code2 < 48 || code2 > 57) {
return undefined // Not a digit
}
second = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number
}
const result = new Date(Date.UTC(year, monthIdx, day, hour, minute, second))
return result.getUTCDay() === weekday ? result : undefined
}
/**
* @see https://httpwg.org/specs/rfc9110.html#obsolete.date.formats
*
* @param {string} date
* @returns {Date | undefined}
*/
function parseAscTimeDate (date) {
// This is assumed to be in UTC
if (
date.length !== 24 ||
date[7] !== ' ' ||
date[10] !== ' ' ||
date[19] !== ' '
) {
return undefined
}
let weekday = -1
if (date[0] === 'S' && date[1] === 'u' && date[2] === 'n') { // Sunday
weekday = 0
} else if (date[0] === 'M' && date[1] === 'o' && date[2] === 'n') { // Monday
weekday = 1
} else if (date[0] === 'T' && date[1] === 'u' && date[2] === 'e') { // Tuesday
weekday = 2
} else if (date[0] === 'W' && date[1] === 'e' && date[2] === 'd') { // Wednesday
weekday = 3
} else if (date[0] === 'T' && date[1] === 'h' && date[2] === 'u') { // Thursday
weekday = 4
} else if (date[0] === 'F' && date[1] === 'r' && date[2] === 'i') { // Friday
weekday = 5
} else if (date[0] === 'S' && date[1] === 'a' && date[2] === 't') { // Saturday
weekday = 6
} else {
return undefined // Not a valid day of the week
}
let monthIdx = -1
if (
(date[4] === 'J' && date[5] === 'a' && date[6] === 'n')
) {
monthIdx = 0 // Jan
} else if (
(date[4] === 'F' && date[5] === 'e' && date[6] === 'b')
) {
monthIdx = 1 // Feb
} else if (
(date[4] === 'M' && date[5] === 'a')
) {
if (date[6] === 'r') {
monthIdx = 2 // Mar
} else if (date[6] === 'y') {
monthIdx = 4 // May
} else {
return undefined // Invalid month
}
} else if (
(date[4] === 'J')
) {
if (date[5] === 'a' && date[6] === 'n') {
monthIdx = 0 // Jan
} else if (date[5] === 'u') {
if (date[6] === 'n') {
monthIdx = 5 // Jun
} else if (date[6] === 'l') {
monthIdx = 6 // Jul
} else {
return undefined // Invalid month
}
} else {
return undefined // Invalid month
}
} else if (
(date[4] === 'A')
) {
if (date[5] === 'p' && date[6] === 'r') {
monthIdx = 3 // Apr
} else if (date[5] === 'u' && date[6] === 'g') {
monthIdx = 7 // Aug
} else {
return undefined // Invalid month
}
} else if (
(date[4] === 'S' && date[5] === 'e' && date[6] === 'p')
) {
monthIdx = 8 // Sep
} else if (
(date[4] === 'O' && date[5] === 'c' && date[6] === 't')
) {
monthIdx = 9 // Oct
} else if (
(date[4] === 'N' && date[5] === 'o' && date[6] === 'v')
) {
monthIdx = 10 // Nov
} else if (
(date[4] === 'D' && date[5] === 'e' && date[6] === 'c')
) {
monthIdx = 11 // Dec
} else {
// Not a valid month
return undefined
}
let day = 0
if (date[8] === ' ') {
// Single digit day, e.g. "Sun Nov 6 08:49:37 1994"
const code = date.charCodeAt(9)
if (code < 49 || code > 57) {
return undefined // Not a digit
}
day = code - 48 // Convert ASCII code to number
} else {
const code1 = date.charCodeAt(8)
if (code1 < 49 || code1 > 51) {
return undefined // Not a digit between 1 and 3
}
const code2 = date.charCodeAt(9)
if (code2 < 48 || code2 > 57) {
return undefined // Not a digit
}
day = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number
}
let hour = 0
if (date[11] === '0') {
const code = date.charCodeAt(12)
if (code < 48 || code > 57) {
return undefined // Not a digit
}
hour = code - 48 // Convert ASCII code to number
} else {
const code1 = date.charCodeAt(11)
if (code1 < 48 || code1 > 50) {
return undefined // Not a digit between 0 and 2
}
const code2 = date.charCodeAt(12)
if (code2 < 48 || code2 > 57) {
return undefined // Not a digit
}
if (code1 === 50 && code2 > 51) {
return undefined // Hour cannot be greater than 23
}
hour = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number
}
let minute = 0
if (date[14] === '0') {
const code = date.charCodeAt(15)
if (code < 48 || code > 57) {
return undefined // Not a digit
}
minute = code - 48 // Convert ASCII code to number
} else {
const code1 = date.charCodeAt(14)
if (code1 < 48 || code1 > 53) {
return undefined // Not a digit between 0 and 5
}
const code2 = date.charCodeAt(15)
if (code2 < 48 || code2 > 57) {
return undefined // Not a digit
}
minute = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number
}
let second = 0
if (date[17] === '0') {
const code = date.charCodeAt(18)
if (code < 48 || code > 57) {
return undefined // Not a digit
}
second = code - 48 // Convert ASCII code to number
} else {
const code1 = date.charCodeAt(17)
if (code1 < 48 || code1 > 53) {
return undefined // Not a digit between 0 and 5
}
const code2 = date.charCodeAt(18)
if (code2 < 48 || code2 > 57) {
return undefined // Not a digit
}
second = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number
}
const yearDigit1 = date.charCodeAt(20)
if (yearDigit1 < 48 || yearDigit1 > 57) {
return undefined // Not a digit
}
const yearDigit2 = date.charCodeAt(21)
if (yearDigit2 < 48 || yearDigit2 > 57) {
return undefined // Not a digit
}
const yearDigit3 = date.charCodeAt(22)
if (yearDigit3 < 48 || yearDigit3 > 57) {
return undefined // Not a digit
}
const yearDigit4 = date.charCodeAt(23)
if (yearDigit4 < 48 || yearDigit4 > 57) {
return undefined // Not a digit
}
const year = (yearDigit1 - 48) * 1000 + (yearDigit2 - 48) * 100 + (yearDigit3 - 48) * 10 + (yearDigit4 - 48)
const result = new Date(Date.UTC(year, monthIdx, day, hour, minute, second))
return result.getUTCDay() === weekday ? result : undefined
}
/**
* @see https://httpwg.org/specs/rfc9110.html#obsolete.date.formats
*
* @param {string} date
* @returns {Date | undefined}
*/
function parseRfc850Date (date) {
let commaIndex = -1
let weekday = -1
if (date[0] === 'S') {
if (date[1] === 'u' && date[2] === 'n' && date[3] === 'd' && date[4] === 'a' && date[5] === 'y') {
weekday = 0 // Sunday
commaIndex = 6
} else if (date[1] === 'a' && date[2] === 't' && date[3] === 'u' && date[4] === 'r' && date[5] === 'd' && date[6] === 'a' && date[7] === 'y') {
weekday = 6 // Saturday
commaIndex = 8
}
} else if (date[0] === 'M' && date[1] === 'o' && date[2] === 'n' && date[3] === 'd' && date[4] === 'a' && date[5] === 'y') {
weekday = 1 // Monday
commaIndex = 6
} else if (date[0] === 'T') {
if (date[1] === 'u' && date[2] === 'e' && date[3] === 's' && date[4] === 'd' && date[5] === 'a' && date[6] === 'y') {
weekday = 2 // Tuesday
commaIndex = 7
} else if (date[1] === 'h' && date[2] === 'u' && date[3] === 'r' && date[4] === 's' && date[5] === 'd' && date[6] === 'a' && date[7] === 'y') {
weekday = 4 // Thursday
commaIndex = 8
}
} else if (date[0] === 'W' && date[1] === 'e' && date[2] === 'd' && date[3] === 'n' && date[4] === 'e' && date[5] === 's' && date[6] === 'd' && date[7] === 'a' && date[8] === 'y') {
weekday = 3 // Wednesday
commaIndex = 9
} else if (date[0] === 'F' && date[1] === 'r' && date[2] === 'i' && date[3] === 'd' && date[4] === 'a' && date[5] === 'y') {
weekday = 5 // Friday
commaIndex = 6
} else {
// Not a valid day name
return undefined
}
if (
date[commaIndex] !== ',' ||
(date.length - commaIndex - 1) !== 23 ||
date[commaIndex + 1] !== ' ' ||
date[commaIndex + 4] !== '-' ||
date[commaIndex + 8] !== '-' ||
date[commaIndex + 11] !== ' ' ||
date[commaIndex + 14] !== ':' ||
date[commaIndex + 17] !== ':' ||
date[commaIndex + 20] !== ' ' ||
date[commaIndex + 21] !== 'G' ||
date[commaIndex + 22] !== 'M' ||
date[commaIndex + 23] !== 'T'
) {
return undefined
}
let day = 0
if (date[commaIndex + 2] === '0') {
// Single digit day, e.g. "Sun Nov 6 08:49:37 1994"
const code = date.charCodeAt(commaIndex + 3)
if (code < 49 || code > 57) {
return undefined // Not a digit
}
day = code - 48 // Convert ASCII code to number
} else {
const code1 = date.charCodeAt(commaIndex + 2)
if (code1 < 49 || code1 > 51) {
return undefined // Not a digit between 1 and 3
}
const code2 = date.charCodeAt(commaIndex + 3)
if (code2 < 48 || code2 > 57) {
return undefined // Not a digit
}
day = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number
}
let monthIdx = -1
if (
(date[commaIndex + 5] === 'J' && date[commaIndex + 6] === 'a' && date[commaIndex + 7] === 'n')
) {
monthIdx = 0 // Jan
} else if (
(date[commaIndex + 5] === 'F' && date[commaIndex + 6] === 'e' && date[commaIndex + 7] === 'b')
) {
monthIdx = 1 // Feb
} else if (
(date[commaIndex + 5] === 'M' && date[commaIndex + 6] === 'a' && date[commaIndex + 7] === 'r')
) {
monthIdx = 2 // Mar
} else if (
(date[commaIndex + 5] === 'A' && date[commaIndex + 6] === 'p' && date[commaIndex + 7] === 'r')
) {
monthIdx = 3 // Apr
} else if (
(date[commaIndex + 5] === 'M' && date[commaIndex + 6] === 'a' && date[commaIndex + 7] === 'y')
) {
monthIdx = 4 // May
} else if (
(date[commaIndex + 5] === 'J' && date[commaIndex + 6] === 'u' && date[commaIndex + 7] === 'n')
) {
monthIdx = 5 // Jun
} else if (
(date[commaIndex + 5] === 'J' && date[commaIndex + 6] === 'u' && date[commaIndex + 7] === 'l')
) {
monthIdx = 6 // Jul
} else if (
(date[commaIndex + 5] === 'A' && date[commaIndex + 6] === 'u' && date[commaIndex + 7] === 'g')
) {
monthIdx = 7 // Aug
} else if (
(date[commaIndex + 5] === 'S' && date[commaIndex + 6] === 'e' && date[commaIndex + 7] === 'p')
) {
monthIdx = 8 // Sep
} else if (
(date[commaIndex + 5] === 'O' && date[commaIndex + 6] === 'c' && date[commaIndex + 7] === 't')
) {
monthIdx = 9 // Oct
} else if (
(date[commaIndex + 5] === 'N' && date[commaIndex + 6] === 'o' && date[commaIndex + 7] === 'v')
) {
monthIdx = 10 // Nov
} else if (
(date[commaIndex + 5] === 'D' && date[commaIndex + 6] === 'e' && date[commaIndex + 7] === 'c')
) {
monthIdx = 11 // Dec
} else {
// Not a valid month
return undefined
}
const yearDigit1 = date.charCodeAt(commaIndex + 9)
if (yearDigit1 < 48 || yearDigit1 > 57) {
return undefined // Not a digit
}
const yearDigit2 = date.charCodeAt(commaIndex + 10)
if (yearDigit2 < 48 || yearDigit2 > 57) {
return undefined // Not a digit
}
let year = (yearDigit1 - 48) * 10 + (yearDigit2 - 48) // Convert ASCII codes to number
// RFC 6265 states that the year is in the range 1970-2069.
// @see https://datatracker.ietf.org/doc/html/rfc6265#section-5.1.1
//
// 3. If the year-value is greater than or equal to 70 and less than or
// equal to 99, increment the year-value by 1900.
// 4. If the year-value is greater than or equal to 0 and less than or
// equal to 69, increment the year-value by 2000.
year += year < 70 ? 2000 : 1900
let hour = 0
if (date[commaIndex + 12] === '0') {
const code = date.charCodeAt(commaIndex + 13)
if (code < 48 || code > 57) {
return undefined // Not a digit
}
hour = code - 48 // Convert ASCII code to number
} else {
const code1 = date.charCodeAt(commaIndex + 12)
if (code1 < 48 || code1 > 50) {
return undefined // Not a digit between 0 and 2
}
const code2 = date.charCodeAt(commaIndex + 13)
if (code2 < 48 || code2 > 57) {
return undefined // Not a digit
}
if (code1 === 50 && code2 > 51) {
return undefined // Hour cannot be greater than 23
}
hour = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number
}
let minute = 0
if (date[commaIndex + 15] === '0') {
const code = date.charCodeAt(commaIndex + 16)
if (code < 48 || code > 57) {
return undefined // Not a digit
}
minute = code - 48 // Convert ASCII code to number
} else {
const code1 = date.charCodeAt(commaIndex + 15)
if (code1 < 48 || code1 > 53) {
return undefined // Not a digit between 0 and 5
}
const code2 = date.charCodeAt(commaIndex + 16)
if (code2 < 48 || code2 > 57) {
return undefined // Not a digit
}
minute = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number
}
let second = 0
if (date[commaIndex + 18] === '0') {
const code = date.charCodeAt(commaIndex + 19)
if (code < 48 || code > 57) {
return undefined // Not a digit
}
second = code - 48 // Convert ASCII code to number
} else {
const code1 = date.charCodeAt(commaIndex + 18)
if (code1 < 48 || code1 > 53) {
return undefined // Not a digit between 0 and 5
}
const code2 = date.charCodeAt(commaIndex + 19)
if (code2 < 48 || code2 > 57) {
return undefined // Not a digit
}
second = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number
}
const result = new Date(Date.UTC(year, monthIdx, day, hour, minute, second))
return result.getUTCDay() === weekday ? result : undefined
}
module.exports = {
parseHttpDate
}