| // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| part of dart._http; |
| |
| /** |
| * Utility functions for working with dates with HTTP specific date |
| * formats. |
| */ |
| class HttpDate { |
| // From RFC-2616 section "3.3.1 Full Date", |
| // http://tools.ietf.org/html/rfc2616#section-3.3.1 |
| // |
| // HTTP-date = rfc1123-date | rfc850-date | asctime-date |
| // rfc1123-date = wkday "," SP date1 SP time SP "GMT" |
| // rfc850-date = weekday "," SP date2 SP time SP "GMT" |
| // asctime-date = wkday SP date3 SP time SP 4DIGIT |
| // date1 = 2DIGIT SP month SP 4DIGIT |
| // ; day month year (e.g., 02 Jun 1982) |
| // date2 = 2DIGIT "-" month "-" 2DIGIT |
| // ; day-month-year (e.g., 02-Jun-82) |
| // date3 = month SP ( 2DIGIT | ( SP 1DIGIT )) |
| // ; month day (e.g., Jun 2) |
| // time = 2DIGIT ":" 2DIGIT ":" 2DIGIT |
| // ; 00:00:00 - 23:59:59 |
| // wkday = "Mon" | "Tue" | "Wed" |
| // | "Thu" | "Fri" | "Sat" | "Sun" |
| // weekday = "Monday" | "Tuesday" | "Wednesday" |
| // | "Thursday" | "Friday" | "Saturday" | "Sunday" |
| // month = "Jan" | "Feb" | "Mar" | "Apr" |
| // | "May" | "Jun" | "Jul" | "Aug" |
| // | "Sep" | "Oct" | "Nov" | "Dec" |
| |
| /** |
| * Format a date according to |
| * [RFC-1123](http://tools.ietf.org/html/rfc1123 "RFC-1123"), |
| * e.g. `Thu, 1 Jan 1970 00:00:00 GMT`. |
| */ |
| static String format(DateTime date) { |
| const List wkday = const ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]; |
| const List month = const [ |
| "Jan", |
| "Feb", |
| "Mar", |
| "Apr", |
| "May", |
| "Jun", |
| "Jul", |
| "Aug", |
| "Sep", |
| "Oct", |
| "Nov", |
| "Dec" |
| ]; |
| |
| DateTime d = date.toUtc(); |
| StringBuffer sb = new StringBuffer() |
| ..write(wkday[d.weekday - 1]) |
| ..write(", ") |
| ..write(d.day <= 9 ? "0" : "") |
| ..write(d.day.toString()) |
| ..write(" ") |
| ..write(month[d.month - 1]) |
| ..write(" ") |
| ..write(d.year.toString()) |
| ..write(d.hour <= 9 ? " 0" : " ") |
| ..write(d.hour.toString()) |
| ..write(d.minute <= 9 ? ":0" : ":") |
| ..write(d.minute.toString()) |
| ..write(d.second <= 9 ? ":0" : ":") |
| ..write(d.second.toString()) |
| ..write(" GMT"); |
| return sb.toString(); |
| } |
| |
| /** |
| * Parse a date string in either of the formats |
| * [RFC-1123](http://tools.ietf.org/html/rfc1123 "RFC-1123"), |
| * [RFC-850](http://tools.ietf.org/html/rfc850 "RFC-850") or |
| * ANSI C's asctime() format. These formats are listed here. |
| * |
| * Thu, 1 Jan 1970 00:00:00 GMT |
| * Thursday, 1-Jan-1970 00:00:00 GMT |
| * Thu Jan 1 00:00:00 1970 |
| * |
| * For more information see [RFC-2616 section |
| * 3.1.1](http://tools.ietf.org/html/rfc2616#section-3.3.1 |
| * "RFC-2616 section 3.1.1"). |
| */ |
| static DateTime parse(String date) { |
| final int SP = 32; |
| const List wkdays = const ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]; |
| const List weekdays = const [ |
| "Monday", |
| "Tuesday", |
| "Wednesday", |
| "Thursday", |
| "Friday", |
| "Saturday", |
| "Sunday" |
| ]; |
| const List months = const [ |
| "Jan", |
| "Feb", |
| "Mar", |
| "Apr", |
| "May", |
| "Jun", |
| "Jul", |
| "Aug", |
| "Sep", |
| "Oct", |
| "Nov", |
| "Dec" |
| ]; |
| |
| final int formatRfc1123 = 0; |
| final int formatRfc850 = 1; |
| final int formatAsctime = 2; |
| |
| int index = 0; |
| String tmp; |
| |
| void expect(String s) { |
| if (date.length - index < s.length) { |
| throw new HttpException("Invalid HTTP date $date"); |
| } |
| String tmp = date.substring(index, index + s.length); |
| if (tmp != s) { |
| throw new HttpException("Invalid HTTP date $date"); |
| } |
| index += s.length; |
| } |
| |
| int expectWeekday() { |
| int weekday; |
| // The formatting of the weekday signals the format of the date string. |
| int pos = date.indexOf(",", index); |
| if (pos == -1) { |
| int pos = date.indexOf(" ", index); |
| if (pos == -1) throw new HttpException("Invalid HTTP date $date"); |
| tmp = date.substring(index, pos); |
| index = pos + 1; |
| weekday = wkdays.indexOf(tmp); |
| if (weekday != -1) { |
| return formatAsctime; |
| } |
| } else { |
| tmp = date.substring(index, pos); |
| index = pos + 1; |
| weekday = wkdays.indexOf(tmp); |
| if (weekday != -1) { |
| return formatRfc1123; |
| } |
| weekday = weekdays.indexOf(tmp); |
| if (weekday != -1) { |
| return formatRfc850; |
| } |
| } |
| throw new HttpException("Invalid HTTP date $date"); |
| } |
| |
| int expectMonth(String separator) { |
| int pos = date.indexOf(separator, index); |
| if (pos - index != 3) throw new HttpException("Invalid HTTP date $date"); |
| tmp = date.substring(index, pos); |
| index = pos + 1; |
| int month = months.indexOf(tmp); |
| if (month != -1) return month; |
| throw new HttpException("Invalid HTTP date $date"); |
| } |
| |
| int expectNum(String separator) { |
| int pos; |
| if (separator.length > 0) { |
| pos = date.indexOf(separator, index); |
| } else { |
| pos = date.length; |
| } |
| String tmp = date.substring(index, pos); |
| index = pos + separator.length; |
| try { |
| int value = int.parse(tmp); |
| return value; |
| } on FormatException { |
| throw new HttpException("Invalid HTTP date $date"); |
| } |
| } |
| |
| void expectEnd() { |
| if (index != date.length) { |
| throw new HttpException("Invalid HTTP date $date"); |
| } |
| } |
| |
| int format = expectWeekday(); |
| int year; |
| int month; |
| int day; |
| int hours; |
| int minutes; |
| int seconds; |
| if (format == formatAsctime) { |
| month = expectMonth(" "); |
| if (date.codeUnitAt(index) == SP) index++; |
| day = expectNum(" "); |
| hours = expectNum(":"); |
| minutes = expectNum(":"); |
| seconds = expectNum(" "); |
| year = expectNum(""); |
| } else { |
| expect(" "); |
| day = expectNum(format == formatRfc1123 ? " " : "-"); |
| month = expectMonth(format == formatRfc1123 ? " " : "-"); |
| year = expectNum(" "); |
| hours = expectNum(":"); |
| minutes = expectNum(":"); |
| seconds = expectNum(" "); |
| expect("GMT"); |
| } |
| expectEnd(); |
| return new DateTime.utc(year, month + 1, day, hours, minutes, seconds, 0); |
| } |
| |
| // Parse a cookie date string. |
| static DateTime _parseCookieDate(String date) { |
| const List monthsLowerCase = const [ |
| "jan", |
| "feb", |
| "mar", |
| "apr", |
| "may", |
| "jun", |
| "jul", |
| "aug", |
| "sep", |
| "oct", |
| "nov", |
| "dec" |
| ]; |
| |
| int position = 0; |
| |
| Never error() { |
| throw new HttpException("Invalid cookie date $date"); |
| } |
| |
| bool isEnd() => position == date.length; |
| |
| bool isDelimiter(String s) { |
| int char = s.codeUnitAt(0); |
| if (char == 0x09) return true; |
| if (char >= 0x20 && char <= 0x2F) return true; |
| if (char >= 0x3B && char <= 0x40) return true; |
| if (char >= 0x5B && char <= 0x60) return true; |
| if (char >= 0x7B && char <= 0x7E) return true; |
| return false; |
| } |
| |
| bool isNonDelimiter(String s) { |
| int char = s.codeUnitAt(0); |
| if (char >= 0x00 && char <= 0x08) return true; |
| if (char >= 0x0A && char <= 0x1F) return true; |
| if (char >= 0x30 && char <= 0x39) return true; // Digit |
| if (char == 0x3A) return true; // ':' |
| if (char >= 0x41 && char <= 0x5A) return true; // Alpha |
| if (char >= 0x61 && char <= 0x7A) return true; // Alpha |
| if (char >= 0x7F && char <= 0xFF) return true; // Alpha |
| return false; |
| } |
| |
| bool isDigit(String s) { |
| int char = s.codeUnitAt(0); |
| if (char > 0x2F && char < 0x3A) return true; |
| return false; |
| } |
| |
| int getMonth(String month) { |
| if (month.length < 3) return -1; |
| return monthsLowerCase.indexOf(month.substring(0, 3)); |
| } |
| |
| int toInt(String s) { |
| int index = 0; |
| for (; index < s.length && isDigit(s[index]); index++); |
| return int.parse(s.substring(0, index)); |
| } |
| |
| var tokens = []; |
| while (!isEnd()) { |
| while (!isEnd() && isDelimiter(date[position])) position++; |
| int start = position; |
| while (!isEnd() && isNonDelimiter(date[position])) position++; |
| tokens.add(date.substring(start, position).toLowerCase()); |
| while (!isEnd() && isDelimiter(date[position])) position++; |
| } |
| |
| String? timeStr; |
| String? dayOfMonthStr; |
| String? monthStr; |
| String? yearStr; |
| |
| for (var token in tokens) { |
| if (token.length < 1) continue; |
| if (timeStr == null && |
| token.length >= 5 && |
| isDigit(token[0]) && |
| (token[1] == ":" || (isDigit(token[1]) && token[2] == ":"))) { |
| timeStr = token; |
| } else if (dayOfMonthStr == null && isDigit(token[0])) { |
| dayOfMonthStr = token; |
| } else if (monthStr == null && getMonth(token) >= 0) { |
| monthStr = token; |
| } else if (yearStr == null && |
| token.length >= 2 && |
| isDigit(token[0]) && |
| isDigit(token[1])) { |
| yearStr = token; |
| } |
| } |
| |
| if (timeStr == null || |
| dayOfMonthStr == null || |
| monthStr == null || |
| yearStr == null) { |
| error(); |
| } |
| |
| int year = toInt(yearStr); |
| if (year >= 70 && year <= 99) |
| year += 1900; |
| else if (year >= 0 && year <= 69) year += 2000; |
| if (year < 1601) error(); |
| |
| int dayOfMonth = toInt(dayOfMonthStr); |
| if (dayOfMonth < 1 || dayOfMonth > 31) error(); |
| |
| int month = getMonth(monthStr) + 1; |
| |
| var timeList = timeStr.split(":"); |
| if (timeList.length != 3) error(); |
| int hour = toInt(timeList[0]); |
| int minute = toInt(timeList[1]); |
| int second = toInt(timeList[2]); |
| if (hour > 23) error(); |
| if (minute > 59) error(); |
| if (second > 59) error(); |
| |
| return new DateTime.utc(year, month, dayOfMonth, hour, minute, second, 0); |
| } |
| } |