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date.js19.7 KB · 671 lines
1'use strict'2 3/**4 * @see https://www.rfc-editor.org/rfc/rfc9110.html#name-date-time-formats5 *6 * @param {string} date7 * @returns {Date | undefined}8 */9function parseHttpDate (date) {10  // Sun, 06 Nov 1994 08:49:37 GMT    ; IMF-fixdate11  // Sun Nov  6 08:49:37 1994         ; ANSI C's asctime() format12  // Sunday, 06-Nov-94 08:49:37 GMT   ; obsolete RFC 850 format13 14  switch (date[3]) {15    case ',': return parseImfDate(date)16    case ' ': return parseAscTimeDate(date)17    default: return parseRfc850Date(date)18  }19}20 21function makeDate (year, monthIdx, day, hour, minute, second, weekday) {22  const result = new Date(Date.UTC(year, monthIdx, day, hour, minute, second))23 24  // Date.UTC treats years 0-99 as 1900-1999. Reset the full year so component25  // checks below validate the HTTP date as written.26  if (year >= 0 && year <= 99) {27    result.setUTCFullYear(year)28  }29 30  return result.getUTCFullYear() === year &&31    result.getUTCMonth() === monthIdx &&32    result.getUTCDate() === day &&33    result.getUTCHours() === hour &&34    result.getUTCMinutes() === minute &&35    result.getUTCSeconds() === second &&36    result.getUTCDay() === weekday37    ? result38    : undefined39}40 41/**42 * @see https://httpwg.org/specs/rfc9110.html#preferred.date.format43 *44 * @param {string} date45 * @returns {Date | undefined}46 */47function parseImfDate (date) {48  if (49    date.length !== 29 ||50    date[4] !== ' ' ||51    date[7] !== ' ' ||52    date[11] !== ' ' ||53    date[16] !== ' ' ||54    date[19] !== ':' ||55    date[22] !== ':' ||56    date[25] !== ' ' ||57    date[26] !== 'G' ||58    date[27] !== 'M' ||59    date[28] !== 'T'60  ) {61    return undefined62  }63 64  let weekday = -165  if (date[0] === 'S' && date[1] === 'u' && date[2] === 'n') { // Sunday66    weekday = 067  } else if (date[0] === 'M' && date[1] === 'o' && date[2] === 'n') { // Monday68    weekday = 169  } else if (date[0] === 'T' && date[1] === 'u' && date[2] === 'e') { // Tuesday70    weekday = 271  } else if (date[0] === 'W' && date[1] === 'e' && date[2] === 'd') { // Wednesday72    weekday = 373  } else if (date[0] === 'T' && date[1] === 'h' && date[2] === 'u') { // Thursday74    weekday = 475  } else if (date[0] === 'F' && date[1] === 'r' && date[2] === 'i') { // Friday76    weekday = 577  } else if (date[0] === 'S' && date[1] === 'a' && date[2] === 't') { // Saturday78    weekday = 679  } else {80    return undefined // Not a valid day of the week81  }82 83  let day = 084  if (date[5] === '0') {85    // Single digit day, e.g. "Sun Nov 6 08:49:37 1994"86    const code = date.charCodeAt(6)87    if (code < 49 || code > 57) {88      return undefined // Not a digit89    }90    day = code - 48 // Convert ASCII code to number91  } else {92    const code1 = date.charCodeAt(5)93    if (code1 < 49 || code1 > 51) {94      return undefined // Not a digit between 1 and 395    }96    const code2 = date.charCodeAt(6)97    if (code2 < 48 || code2 > 57) {98      return undefined // Not a digit99    }100    day = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number101  }102 103  let monthIdx = -1104  if (105    (date[8] === 'J' && date[9] === 'a' && date[10] === 'n')106  ) {107    monthIdx = 0 // Jan108  } else if (109    (date[8] === 'F' && date[9] === 'e' && date[10] === 'b')110  ) {111    monthIdx = 1 // Feb112  } else if (113    (date[8] === 'M' && date[9] === 'a')114  ) {115    if (date[10] === 'r') {116      monthIdx = 2 // Mar117    } else if (date[10] === 'y') {118      monthIdx = 4 // May119    } else {120      return undefined // Invalid month121    }122  } else if (123    (date[8] === 'J')124  ) {125    if (date[9] === 'a' && date[10] === 'n') {126      monthIdx = 0 // Jan127    } else if (date[9] === 'u') {128      if (date[10] === 'n') {129        monthIdx = 5 // Jun130      } else if (date[10] === 'l') {131        monthIdx = 6 // Jul132      } else {133        return undefined // Invalid month134      }135    } else {136      return undefined // Invalid month137    }138  } else if (139    (date[8] === 'A')140  ) {141    if (date[9] === 'p' && date[10] === 'r') {142      monthIdx = 3 // Apr143    } else if (date[9] === 'u' && date[10] === 'g') {144      monthIdx = 7 // Aug145    } else {146      return undefined // Invalid month147    }148  } else if (149    (date[8] === 'S' && date[9] === 'e' && date[10] === 'p')150  ) {151    monthIdx = 8 // Sep152  } else if (153    (date[8] === 'O' && date[9] === 'c' && date[10] === 't')154  ) {155    monthIdx = 9 // Oct156  } else if (157    (date[8] === 'N' && date[9] === 'o' && date[10] === 'v')158  ) {159    monthIdx = 10 // Nov160  } else if (161    (date[8] === 'D' && date[9] === 'e' && date[10] === 'c')162  ) {163    monthIdx = 11 // Dec164  } else {165    // Not a valid month166    return undefined167  }168 169  const yearDigit1 = date.charCodeAt(12)170  if (yearDigit1 < 48 || yearDigit1 > 57) {171    return undefined // Not a digit172  }173  const yearDigit2 = date.charCodeAt(13)174  if (yearDigit2 < 48 || yearDigit2 > 57) {175    return undefined // Not a digit176  }177  const yearDigit3 = date.charCodeAt(14)178  if (yearDigit3 < 48 || yearDigit3 > 57) {179    return undefined // Not a digit180  }181  const yearDigit4 = date.charCodeAt(15)182  if (yearDigit4 < 48 || yearDigit4 > 57) {183    return undefined // Not a digit184  }185  const year = (yearDigit1 - 48) * 1000 + (yearDigit2 - 48) * 100 + (yearDigit3 - 48) * 10 + (yearDigit4 - 48)186 187  let hour = 0188  if (date[17] === '0') {189    const code = date.charCodeAt(18)190    if (code < 48 || code > 57) {191      return undefined // Not a digit192    }193    hour = code - 48 // Convert ASCII code to number194  } else {195    const code1 = date.charCodeAt(17)196    if (code1 < 48 || code1 > 50) {197      return undefined // Not a digit between 0 and 2198    }199    const code2 = date.charCodeAt(18)200    if (code2 < 48 || code2 > 57) {201      return undefined // Not a digit202    }203    if (code1 === 50 && code2 > 51) {204      return undefined // Hour cannot be greater than 23205    }206    hour = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number207  }208 209  let minute = 0210  if (date[20] === '0') {211    const code = date.charCodeAt(21)212    if (code < 48 || code > 57) {213      return undefined // Not a digit214    }215    minute = code - 48 // Convert ASCII code to number216  } else {217    const code1 = date.charCodeAt(20)218    if (code1 < 48 || code1 > 53) {219      return undefined // Not a digit between 0 and 5220    }221    const code2 = date.charCodeAt(21)222    if (code2 < 48 || code2 > 57) {223      return undefined // Not a digit224    }225    minute = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number226  }227 228  let second = 0229  if (date[23] === '0') {230    const code = date.charCodeAt(24)231    if (code < 48 || code > 57) {232      return undefined // Not a digit233    }234    second = code - 48 // Convert ASCII code to number235  } else {236    const code1 = date.charCodeAt(23)237    if (code1 < 48 || code1 > 53) {238      return undefined // Not a digit between 0 and 5239    }240    const code2 = date.charCodeAt(24)241    if (code2 < 48 || code2 > 57) {242      return undefined // Not a digit243    }244    second = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number245  }246 247  return makeDate(year, monthIdx, day, hour, minute, second, weekday)248}249 250/**251 * @see https://httpwg.org/specs/rfc9110.html#obsolete.date.formats252 *253 * @param {string} date254 * @returns {Date | undefined}255 */256function parseAscTimeDate (date) {257  // This is assumed to be in UTC258 259  if (260    date.length !== 24 ||261    date[7] !== ' ' ||262    date[10] !== ' ' ||263    date[19] !== ' '264  ) {265    return undefined266  }267 268  let weekday = -1269  if (date[0] === 'S' && date[1] === 'u' && date[2] === 'n') { // Sunday270    weekday = 0271  } else if (date[0] === 'M' && date[1] === 'o' && date[2] === 'n') { // Monday272    weekday = 1273  } else if (date[0] === 'T' && date[1] === 'u' && date[2] === 'e') { // Tuesday274    weekday = 2275  } else if (date[0] === 'W' && date[1] === 'e' && date[2] === 'd') { // Wednesday276    weekday = 3277  } else if (date[0] === 'T' && date[1] === 'h' && date[2] === 'u') { // Thursday278    weekday = 4279  } else if (date[0] === 'F' && date[1] === 'r' && date[2] === 'i') { // Friday280    weekday = 5281  } else if (date[0] === 'S' && date[1] === 'a' && date[2] === 't') { // Saturday282    weekday = 6283  } else {284    return undefined // Not a valid day of the week285  }286 287  let monthIdx = -1288  if (289    (date[4] === 'J' && date[5] === 'a' && date[6] === 'n')290  ) {291    monthIdx = 0 // Jan292  } else if (293    (date[4] === 'F' && date[5] === 'e' && date[6] === 'b')294  ) {295    monthIdx = 1 // Feb296  } else if (297    (date[4] === 'M' && date[5] === 'a')298  ) {299    if (date[6] === 'r') {300      monthIdx = 2 // Mar301    } else if (date[6] === 'y') {302      monthIdx = 4 // May303    } else {304      return undefined // Invalid month305    }306  } else if (307    (date[4] === 'J')308  ) {309    if (date[5] === 'a' && date[6] === 'n') {310      monthIdx = 0 // Jan311    } else if (date[5] === 'u') {312      if (date[6] === 'n') {313        monthIdx = 5 // Jun314      } else if (date[6] === 'l') {315        monthIdx = 6 // Jul316      } else {317        return undefined // Invalid month318      }319    } else {320      return undefined // Invalid month321    }322  } else if (323    (date[4] === 'A')324  ) {325    if (date[5] === 'p' && date[6] === 'r') {326      monthIdx = 3 // Apr327    } else if (date[5] === 'u' && date[6] === 'g') {328      monthIdx = 7 // Aug329    } else {330      return undefined // Invalid month331    }332  } else if (333    (date[4] === 'S' && date[5] === 'e' && date[6] === 'p')334  ) {335    monthIdx = 8 // Sep336  } else if (337    (date[4] === 'O' && date[5] === 'c' && date[6] === 't')338  ) {339    monthIdx = 9 // Oct340  } else if (341    (date[4] === 'N' && date[5] === 'o' && date[6] === 'v')342  ) {343    monthIdx = 10 // Nov344  } else if (345    (date[4] === 'D' && date[5] === 'e' && date[6] === 'c')346  ) {347    monthIdx = 11 // Dec348  } else {349    // Not a valid month350    return undefined351  }352 353  let day = 0354  if (date[8] === ' ') {355    // Single digit day, e.g. "Sun Nov 6 08:49:37 1994"356    const code = date.charCodeAt(9)357    if (code < 49 || code > 57) {358      return undefined // Not a digit359    }360    day = code - 48 // Convert ASCII code to number361  } else {362    const code1 = date.charCodeAt(8)363    if (code1 < 49 || code1 > 51) {364      return undefined // Not a digit between 1 and 3365    }366    const code2 = date.charCodeAt(9)367    if (code2 < 48 || code2 > 57) {368      return undefined // Not a digit369    }370    day = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number371  }372 373  let hour = 0374  if (date[11] === '0') {375    const code = date.charCodeAt(12)376    if (code < 48 || code > 57) {377      return undefined // Not a digit378    }379    hour = code - 48 // Convert ASCII code to number380  } else {381    const code1 = date.charCodeAt(11)382    if (code1 < 48 || code1 > 50) {383      return undefined // Not a digit between 0 and 2384    }385    const code2 = date.charCodeAt(12)386    if (code2 < 48 || code2 > 57) {387      return undefined // Not a digit388    }389    if (code1 === 50 && code2 > 51) {390      return undefined // Hour cannot be greater than 23391    }392    hour = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number393  }394 395  let minute = 0396  if (date[14] === '0') {397    const code = date.charCodeAt(15)398    if (code < 48 || code > 57) {399      return undefined // Not a digit400    }401    minute = code - 48 // Convert ASCII code to number402  } else {403    const code1 = date.charCodeAt(14)404    if (code1 < 48 || code1 > 53) {405      return undefined // Not a digit between 0 and 5406    }407    const code2 = date.charCodeAt(15)408    if (code2 < 48 || code2 > 57) {409      return undefined // Not a digit410    }411    minute = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number412  }413 414  let second = 0415  if (date[17] === '0') {416    const code = date.charCodeAt(18)417    if (code < 48 || code > 57) {418      return undefined // Not a digit419    }420    second = code - 48 // Convert ASCII code to number421  } else {422    const code1 = date.charCodeAt(17)423    if (code1 < 48 || code1 > 53) {424      return undefined // Not a digit between 0 and 5425    }426    const code2 = date.charCodeAt(18)427    if (code2 < 48 || code2 > 57) {428      return undefined // Not a digit429    }430    second = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number431  }432 433  const yearDigit1 = date.charCodeAt(20)434  if (yearDigit1 < 48 || yearDigit1 > 57) {435    return undefined // Not a digit436  }437  const yearDigit2 = date.charCodeAt(21)438  if (yearDigit2 < 48 || yearDigit2 > 57) {439    return undefined // Not a digit440  }441  const yearDigit3 = date.charCodeAt(22)442  if (yearDigit3 < 48 || yearDigit3 > 57) {443    return undefined // Not a digit444  }445  const yearDigit4 = date.charCodeAt(23)446  if (yearDigit4 < 48 || yearDigit4 > 57) {447    return undefined // Not a digit448  }449  const year = (yearDigit1 - 48) * 1000 + (yearDigit2 - 48) * 100 + (yearDigit3 - 48) * 10 + (yearDigit4 - 48)450 451  return makeDate(year, monthIdx, day, hour, minute, second, weekday)452}453 454/**455 * @see https://httpwg.org/specs/rfc9110.html#obsolete.date.formats456 *457 * @param {string} date458 * @returns {Date | undefined}459 */460function parseRfc850Date (date) {461  let commaIndex = -1462 463  let weekday = -1464  if (date[0] === 'S') {465    if (date[1] === 'u' && date[2] === 'n' && date[3] === 'd' && date[4] === 'a' && date[5] === 'y') {466      weekday = 0 // Sunday467      commaIndex = 6468    } else if (date[1] === 'a' && date[2] === 't' && date[3] === 'u' && date[4] === 'r' && date[5] === 'd' && date[6] === 'a' && date[7] === 'y') {469      weekday = 6 // Saturday470      commaIndex = 8471    }472  } else if (date[0] === 'M' && date[1] === 'o' && date[2] === 'n' && date[3] === 'd' && date[4] === 'a' && date[5] === 'y') {473    weekday = 1 // Monday474    commaIndex = 6475  } else if (date[0] === 'T') {476    if (date[1] === 'u' && date[2] === 'e' && date[3] === 's' && date[4] === 'd' && date[5] === 'a' && date[6] === 'y') {477      weekday = 2 // Tuesday478      commaIndex = 7479    } else if (date[1] === 'h' && date[2] === 'u' && date[3] === 'r' && date[4] === 's' && date[5] === 'd' && date[6] === 'a' && date[7] === 'y') {480      weekday = 4 // Thursday481      commaIndex = 8482    }483  } 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') {484    weekday = 3 // Wednesday485    commaIndex = 9486  } else if (date[0] === 'F' && date[1] === 'r' && date[2] === 'i' && date[3] === 'd' && date[4] === 'a' && date[5] === 'y') {487    weekday = 5 // Friday488    commaIndex = 6489  } else {490    // Not a valid day name491    return undefined492  }493 494  if (495    date[commaIndex] !== ',' ||496    (date.length - commaIndex - 1) !== 23 ||497    date[commaIndex + 1] !== ' ' ||498    date[commaIndex + 4] !== '-' ||499    date[commaIndex + 8] !== '-' ||500    date[commaIndex + 11] !== ' ' ||501    date[commaIndex + 14] !== ':' ||502    date[commaIndex + 17] !== ':' ||503    date[commaIndex + 20] !== ' ' ||504    date[commaIndex + 21] !== 'G' ||505    date[commaIndex + 22] !== 'M' ||506    date[commaIndex + 23] !== 'T'507  ) {508    return undefined509  }510 511  let day = 0512  if (date[commaIndex + 2] === '0') {513    // Single digit day, e.g. "Sun Nov 6 08:49:37 1994"514    const code = date.charCodeAt(commaIndex + 3)515    if (code < 49 || code > 57) {516      return undefined // Not a digit517    }518    day = code - 48 // Convert ASCII code to number519  } else {520    const code1 = date.charCodeAt(commaIndex + 2)521    if (code1 < 49 || code1 > 51) {522      return undefined // Not a digit between 1 and 3523    }524    const code2 = date.charCodeAt(commaIndex + 3)525    if (code2 < 48 || code2 > 57) {526      return undefined // Not a digit527    }528    day = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number529  }530 531  let monthIdx = -1532  if (533    (date[commaIndex + 5] === 'J' && date[commaIndex + 6] === 'a' && date[commaIndex + 7] === 'n')534  ) {535    monthIdx = 0 // Jan536  } else if (537    (date[commaIndex + 5] === 'F' && date[commaIndex + 6] === 'e' && date[commaIndex + 7] === 'b')538  ) {539    monthIdx = 1 // Feb540  } else if (541    (date[commaIndex + 5] === 'M' && date[commaIndex + 6] === 'a' && date[commaIndex + 7] === 'r')542  ) {543    monthIdx = 2 // Mar544  } else if (545    (date[commaIndex + 5] === 'A' && date[commaIndex + 6] === 'p' && date[commaIndex + 7] === 'r')546  ) {547    monthIdx = 3 // Apr548  } else if (549    (date[commaIndex + 5] === 'M' && date[commaIndex + 6] === 'a' && date[commaIndex + 7] === 'y')550  ) {551    monthIdx = 4 // May552  } else if (553    (date[commaIndex + 5] === 'J' && date[commaIndex + 6] === 'u' && date[commaIndex + 7] === 'n')554  ) {555    monthIdx = 5 // Jun556  } else if (557    (date[commaIndex + 5] === 'J' && date[commaIndex + 6] === 'u' && date[commaIndex + 7] === 'l')558  ) {559    monthIdx = 6 // Jul560  } else if (561    (date[commaIndex + 5] === 'A' && date[commaIndex + 6] === 'u' && date[commaIndex + 7] === 'g')562  ) {563    monthIdx = 7 // Aug564  } else if (565    (date[commaIndex + 5] === 'S' && date[commaIndex + 6] === 'e' && date[commaIndex + 7] === 'p')566  ) {567    monthIdx = 8 // Sep568  } else if (569    (date[commaIndex + 5] === 'O' && date[commaIndex + 6] === 'c' && date[commaIndex + 7] === 't')570  ) {571    monthIdx = 9 // Oct572  } else if (573    (date[commaIndex + 5] === 'N' && date[commaIndex + 6] === 'o' && date[commaIndex + 7] === 'v')574  ) {575    monthIdx = 10 // Nov576  } else if (577    (date[commaIndex + 5] === 'D' && date[commaIndex + 6] === 'e' && date[commaIndex + 7] === 'c')578  ) {579    monthIdx = 11 // Dec580  } else {581    // Not a valid month582    return undefined583  }584 585  const yearDigit1 = date.charCodeAt(commaIndex + 9)586  if (yearDigit1 < 48 || yearDigit1 > 57) {587    return undefined // Not a digit588  }589  const yearDigit2 = date.charCodeAt(commaIndex + 10)590  if (yearDigit2 < 48 || yearDigit2 > 57) {591    return undefined // Not a digit592  }593 594  let year = (yearDigit1 - 48) * 10 + (yearDigit2 - 48) // Convert ASCII codes to number595 596  // RFC 6265 states that the year is in the range 1970-2069.597  // @see https://datatracker.ietf.org/doc/html/rfc6265#section-5.1.1598  //599  // 3. If the year-value is greater than or equal to 70 and less than or600  //    equal to 99, increment the year-value by 1900.601  // 4. If the year-value is greater than or equal to 0 and less than or602  //    equal to 69, increment the year-value by 2000.603  year += year < 70 ? 2000 : 1900604 605  let hour = 0606  if (date[commaIndex + 12] === '0') {607    const code = date.charCodeAt(commaIndex + 13)608    if (code < 48 || code > 57) {609      return undefined // Not a digit610    }611    hour = code - 48 // Convert ASCII code to number612  } else {613    const code1 = date.charCodeAt(commaIndex + 12)614    if (code1 < 48 || code1 > 50) {615      return undefined // Not a digit between 0 and 2616    }617    const code2 = date.charCodeAt(commaIndex + 13)618    if (code2 < 48 || code2 > 57) {619      return undefined // Not a digit620    }621    if (code1 === 50 && code2 > 51) {622      return undefined // Hour cannot be greater than 23623    }624    hour = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number625  }626 627  let minute = 0628  if (date[commaIndex + 15] === '0') {629    const code = date.charCodeAt(commaIndex + 16)630    if (code < 48 || code > 57) {631      return undefined // Not a digit632    }633    minute = code - 48 // Convert ASCII code to number634  } else {635    const code1 = date.charCodeAt(commaIndex + 15)636    if (code1 < 48 || code1 > 53) {637      return undefined // Not a digit between 0 and 5638    }639    const code2 = date.charCodeAt(commaIndex + 16)640    if (code2 < 48 || code2 > 57) {641      return undefined // Not a digit642    }643    minute = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number644  }645 646  let second = 0647  if (date[commaIndex + 18] === '0') {648    const code = date.charCodeAt(commaIndex + 19)649    if (code < 48 || code > 57) {650      return undefined // Not a digit651    }652    second = code - 48 // Convert ASCII code to number653  } else {654    const code1 = date.charCodeAt(commaIndex + 18)655    if (code1 < 48 || code1 > 53) {656      return undefined // Not a digit between 0 and 5657    }658    const code2 = date.charCodeAt(commaIndex + 19)659    if (code2 < 48 || code2 > 57) {660      return undefined // Not a digit661    }662    second = (code1 - 48) * 10 + (code2 - 48) // Convert ASCII codes to number663  }664 665  return makeDate(year, monthIdx, day, hour, minute, second, weekday)666}667 668module.exports = {669  parseHttpDate670}671