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| 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 part of dart.io; | |
| 6 | |
| 7 /** | |
| 8 * Utility functions for working with dates with HTTP specific date | |
| 9 * formats. | |
| 10 */ | |
| 11 class HttpDate { | |
| 12 // From RFC-2616 section "3.3.1 Full Date", | |
| 13 // http://tools.ietf.org/html/rfc2616#section-3.3.1 | |
| 14 // | |
| 15 // HTTP-date = rfc1123-date | rfc850-date | asctime-date | |
| 16 // rfc1123-date = wkday "," SP date1 SP time SP "GMT" | |
| 17 // rfc850-date = weekday "," SP date2 SP time SP "GMT" | |
| 18 // asctime-date = wkday SP date3 SP time SP 4DIGIT | |
| 19 // date1 = 2DIGIT SP month SP 4DIGIT | |
| 20 // ; day month year (e.g., 02 Jun 1982) | |
| 21 // date2 = 2DIGIT "-" month "-" 2DIGIT | |
| 22 // ; day-month-year (e.g., 02-Jun-82) | |
| 23 // date3 = month SP ( 2DIGIT | ( SP 1DIGIT )) | |
| 24 // ; month day (e.g., Jun 2) | |
| 25 // time = 2DIGIT ":" 2DIGIT ":" 2DIGIT | |
| 26 // ; 00:00:00 - 23:59:59 | |
| 27 // wkday = "Mon" | "Tue" | "Wed" | |
| 28 // | "Thu" | "Fri" | "Sat" | "Sun" | |
| 29 // weekday = "Monday" | "Tuesday" | "Wednesday" | |
| 30 // | "Thursday" | "Friday" | "Saturday" | "Sunday" | |
| 31 // month = "Jan" | "Feb" | "Mar" | "Apr" | |
| 32 // | "May" | "Jun" | "Jul" | "Aug" | |
| 33 // | "Sep" | "Oct" | "Nov" | "Dec" | |
| 34 | |
| 35 /** | |
| 36 * Format a date according to | |
| 37 * [RFC-1123](http://tools.ietf.org/html/rfc1123 "RFC-1123"), | |
| 38 * e.g. `Thu, 1 Jan 1970 00:00:00 GMT`. | |
| 39 */ | |
| 40 static String format(DateTime date) { | |
| 41 const List wkday = const ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]; | |
| 42 const List month = const ["Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
| 43 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]; | |
| 44 | |
| 45 DateTime d = date.toUtc(); | |
| 46 StringBuffer sb = new StringBuffer() | |
| 47 ..write(wkday[d.weekday - 1]) | |
| 48 ..write(", ") | |
| 49 ..write(d.day <= 9 ? "0" : "") | |
| 50 ..write(d.day.toString()) | |
| 51 ..write(" ") | |
| 52 ..write(month[d.month - 1]) | |
| 53 ..write(" ") | |
| 54 ..write(d.year.toString()) | |
| 55 ..write(d.hour <= 9 ? " 0" : " ") | |
| 56 ..write(d.hour.toString()) | |
| 57 ..write(d.minute <= 9 ? ":0" : ":") | |
| 58 ..write(d.minute.toString()) | |
| 59 ..write(d.second <= 9 ? ":0" : ":") | |
| 60 ..write(d.second.toString()) | |
| 61 ..write(" GMT"); | |
| 62 return sb.toString(); | |
| 63 } | |
| 64 | |
| 65 /** | |
| 66 * Parse a date string in either of the formats | |
| 67 * [RFC-1123](http://tools.ietf.org/html/rfc1123 "RFC-1123"), | |
| 68 * [RFC-850](http://tools.ietf.org/html/rfc850 "RFC-850") or | |
| 69 * ANSI C's asctime() format. These formats are listed here. | |
| 70 * | |
| 71 * Thu, 1 Jan 1970 00:00:00 GMT | |
| 72 * Thursday, 1-Jan-1970 00:00:00 GMT | |
| 73 * Thu Jan 1 00:00:00 1970 | |
| 74 * | |
| 75 * For more information see [RFC-2616 section | |
| 76 * 3.1.1](http://tools.ietf.org/html/rfc2616#section-3.3.1 | |
| 77 * "RFC-2616 section 3.1.1"). | |
| 78 */ | |
| 79 static DateTime parse(String date) { | |
| 80 final int SP = 32; | |
| 81 const List wkdays = const ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]; | |
| 82 const List weekdays = const ["Monday", "Tuesday", "Wednesday", "Thursday", | |
| 83 "Friday", "Saturday", "Sunday"]; | |
| 84 const List months = const ["Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
| 85 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]; | |
| 86 const List wkdaysLowerCase = | |
| 87 const ["mon", "tue", "wed", "thu", "fri", "sat", "sun"]; | |
| 88 const List weekdaysLowerCase = const ["monday", "tuesday", "wednesday", | |
| 89 "thursday", "friday", "saturday", | |
| 90 "sunday"]; | |
| 91 const List monthsLowerCase = const ["jan", "feb", "mar", "apr", "may", | |
| 92 "jun", "jul", "aug", "sep", "oct", | |
| 93 "nov", "dec"]; | |
| 94 | |
| 95 final int formatRfc1123 = 0; | |
| 96 final int formatRfc850 = 1; | |
| 97 final int formatAsctime = 2; | |
| 98 | |
| 99 int index = 0; | |
| 100 String tmp; | |
| 101 int format; | |
| 102 | |
| 103 void expect(String s) { | |
| 104 if (date.length - index < s.length) { | |
| 105 throw new HttpException("Invalid HTTP date $date"); | |
| 106 } | |
| 107 String tmp = date.substring(index, index + s.length); | |
| 108 if (tmp != s) { | |
| 109 throw new HttpException("Invalid HTTP date $date"); | |
| 110 } | |
| 111 index += s.length; | |
| 112 } | |
| 113 | |
| 114 int expectWeekday() { | |
| 115 int weekday; | |
| 116 // The formatting of the weekday signals the format of the date string. | |
| 117 int pos = date.indexOf(",", index); | |
| 118 if (pos == -1) { | |
| 119 int pos = date.indexOf(" ", index); | |
| 120 if (pos == -1) throw new HttpException("Invalid HTTP date $date"); | |
| 121 tmp = date.substring(index, pos); | |
| 122 index = pos + 1; | |
| 123 weekday = wkdays.indexOf(tmp); | |
| 124 if (weekday != -1) { | |
| 125 format = formatAsctime; | |
| 126 return weekday; | |
| 127 } | |
| 128 } else { | |
| 129 tmp = date.substring(index, pos); | |
| 130 index = pos + 1; | |
| 131 weekday = wkdays.indexOf(tmp); | |
| 132 if (weekday != -1) { | |
| 133 format = formatRfc1123; | |
| 134 return weekday; | |
| 135 } | |
| 136 weekday = weekdays.indexOf(tmp); | |
| 137 if (weekday != -1) { | |
| 138 format = formatRfc850; | |
| 139 return weekday; | |
| 140 } | |
| 141 } | |
| 142 throw new HttpException("Invalid HTTP date $date"); | |
| 143 } | |
| 144 | |
| 145 int expectMonth(String separator) { | |
| 146 int pos = date.indexOf(separator, index); | |
| 147 if (pos - index != 3) throw new HttpException("Invalid HTTP date $date"); | |
| 148 tmp = date.substring(index, pos); | |
| 149 index = pos + 1; | |
| 150 int month = months.indexOf(tmp); | |
| 151 if (month != -1) return month; | |
| 152 throw new HttpException("Invalid HTTP date $date"); | |
| 153 } | |
| 154 | |
| 155 int expectNum(String separator) { | |
| 156 int pos; | |
| 157 if (separator.length > 0) { | |
| 158 pos = date.indexOf(separator, index); | |
| 159 } else { | |
| 160 pos = date.length; | |
| 161 } | |
| 162 String tmp = date.substring(index, pos); | |
| 163 index = pos + separator.length; | |
| 164 try { | |
| 165 int value = int.parse(tmp); | |
| 166 return value; | |
| 167 } on FormatException catch (e) { | |
| 168 throw new HttpException("Invalid HTTP date $date"); | |
| 169 } | |
| 170 } | |
| 171 | |
| 172 void expectEnd() { | |
| 173 if (index != date.length) { | |
| 174 throw new HttpException("Invalid HTTP date $date"); | |
| 175 } | |
| 176 } | |
| 177 | |
| 178 int weekday = expectWeekday(); | |
| 179 int day; | |
| 180 int month; | |
| 181 int year; | |
| 182 int hours; | |
| 183 int minutes; | |
| 184 int seconds; | |
| 185 if (format == formatAsctime) { | |
| 186 month = expectMonth(" "); | |
| 187 if (date.codeUnitAt(index) == SP) index++; | |
| 188 day = expectNum(" "); | |
| 189 hours = expectNum(":"); | |
| 190 minutes = expectNum(":"); | |
| 191 seconds = expectNum(" "); | |
| 192 year = expectNum(""); | |
| 193 } else { | |
| 194 expect(" "); | |
| 195 day = expectNum(format == formatRfc1123 ? " " : "-"); | |
| 196 month = expectMonth(format == formatRfc1123 ? " " : "-"); | |
| 197 year = expectNum(" "); | |
| 198 hours = expectNum(":"); | |
| 199 minutes = expectNum(":"); | |
| 200 seconds = expectNum(" "); | |
| 201 expect("GMT"); | |
| 202 } | |
| 203 expectEnd(); | |
| 204 return new DateTime.utc(year, month + 1, day, hours, minutes, seconds, 0); | |
| 205 } | |
| 206 | |
| 207 // Parse a cookie date string. | |
| 208 static DateTime _parseCookieDate(String date) { | |
| 209 const List monthsLowerCase = const ["jan", "feb", "mar", "apr", "may", | |
| 210 "jun", "jul", "aug", "sep", "oct", | |
| 211 "nov", "dec"]; | |
| 212 | |
| 213 int position = 0; | |
| 214 | |
| 215 void error() { | |
| 216 throw new HttpException("Invalid cookie date $date"); | |
| 217 } | |
| 218 | |
| 219 bool isEnd() => position == date.length; | |
| 220 | |
| 221 bool isDelimiter(String s) { | |
| 222 int char = s.codeUnitAt(0); | |
| 223 if (char == 0x09) return true; | |
| 224 if (char >= 0x20 && char <= 0x2F) return true; | |
| 225 if (char >= 0x3B && char <= 0x40) return true; | |
| 226 if (char >= 0x5B && char <= 0x60) return true; | |
| 227 if (char >= 0x7B && char <= 0x7E) return true; | |
| 228 return false; | |
| 229 } | |
| 230 | |
| 231 bool isNonDelimiter(String s) { | |
| 232 int char = s.codeUnitAt(0); | |
| 233 if (char >= 0x00 && char <= 0x08) return true; | |
| 234 if (char >= 0x0A && char <= 0x1F) return true; | |
| 235 if (char >= 0x30 && char <= 0x39) return true; // Digit | |
| 236 if (char == 0x3A) return true; // ':' | |
| 237 if (char >= 0x41 && char <= 0x5A) return true; // Alpha | |
| 238 if (char >= 0x61 && char <= 0x7A) return true; // Alpha | |
| 239 if (char >= 0x7F && char <= 0xFF) return true; // Alpha | |
| 240 return false; | |
| 241 } | |
| 242 | |
| 243 bool isDigit(String s) { | |
| 244 int char = s.codeUnitAt(0); | |
| 245 if (char > 0x2F && char < 0x3A) return true; | |
| 246 return false; | |
| 247 } | |
| 248 | |
| 249 int getMonth(String month) { | |
| 250 if (month.length < 3) return -1; | |
| 251 return monthsLowerCase.indexOf(month.substring(0, 3)); | |
| 252 } | |
| 253 | |
| 254 int toInt(String s) { | |
| 255 int index = 0; | |
| 256 for (; index < s.length && isDigit(s[index]); index++); | |
| 257 return int.parse(s.substring(0, index)); | |
| 258 } | |
| 259 | |
| 260 var tokens = []; | |
| 261 while (!isEnd()) { | |
| 262 while (!isEnd() && isDelimiter(date[position])) position++; | |
| 263 int start = position; | |
| 264 while (!isEnd() && isNonDelimiter(date[position])) position++; | |
| 265 tokens.add(date.substring(start, position).toLowerCase()); | |
| 266 while (!isEnd() && isDelimiter(date[position])) position++; | |
| 267 } | |
| 268 | |
| 269 String timeStr; | |
| 270 String dayOfMonthStr; | |
| 271 String monthStr; | |
| 272 String yearStr; | |
| 273 | |
| 274 for (var token in tokens) { | |
| 275 if (token.length < 1) continue; | |
| 276 if (timeStr == null && token.length >= 5 && isDigit(token[0]) && | |
| 277 (token[1] == ":" || (isDigit(token[1]) && token[2] == ":"))) { | |
| 278 timeStr = token; | |
| 279 } else if (dayOfMonthStr == null && isDigit(token[0])) { | |
| 280 dayOfMonthStr = token; | |
| 281 } else if (monthStr == null && getMonth(token) >= 0) { | |
| 282 monthStr = token; | |
| 283 } else if (yearStr == null && token.length >= 2 && | |
| 284 isDigit(token[0]) && isDigit(token[1])) { | |
| 285 yearStr = token; | |
| 286 } | |
| 287 } | |
| 288 | |
| 289 if (timeStr == null || dayOfMonthStr == null || | |
| 290 monthStr == null || yearStr == null) { | |
| 291 error(); | |
| 292 } | |
| 293 | |
| 294 int year = toInt(yearStr); | |
| 295 if (year >= 70 && year <= 99) year += 1900; | |
| 296 else if (year >= 0 && year <= 69) year += 2000; | |
| 297 if (year < 1601) error(); | |
| 298 | |
| 299 int dayOfMonth = toInt(dayOfMonthStr); | |
| 300 if (dayOfMonth < 1 || dayOfMonth > 31) error(); | |
| 301 | |
| 302 int month = getMonth(monthStr) + 1; | |
| 303 | |
| 304 var timeList = timeStr.split(":"); | |
| 305 if (timeList.length != 3) error(); | |
| 306 int hour = toInt(timeList[0]); | |
| 307 int minute = toInt(timeList[1]); | |
| 308 int second = toInt(timeList[2]); | |
| 309 if (hour > 23) error(); | |
| 310 if (minute > 59) error(); | |
| 311 if (second > 59) error(); | |
| 312 | |
| 313 return new DateTime.utc(year, month, dayOfMonth, hour, minute, second, 0); | |
| 314 } | |
| 315 } | |
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