+// RFC1123StrToTime - Converts a HTTP1.1 full date strings into a time_t /*{{{*/
+// ---------------------------------------------------------------------
+/* tries to parses a full date as specified in RFC7231 §7.1.1.1
+ with one exception: HTTP/1.1 valid dates need to have GMT as timezone.
+ As we encounter dates from UTC or with a numeric timezone in other places,
+ we allow them here to to be able to reuse the method. Either way, a date
+ must be in UTC or parsing will fail. Previous implementations of this
+ method used to ignore the timezone and assume always UTC. */
+bool RFC1123StrToTime(const char* const str,time_t &time)
+{
+ unsigned short day = 0;
+ signed int year = 0; // yes, Y23K problem – we gonna worry then…
+ std::string weekday, month, datespec, timespec, zone;
+ std::istringstream ss(str);
+ auto const &posix = std::locale::classic();
+ ss.imbue(posix);
+ ss >> weekday;
+ // we only superficially check weekday, mostly to avoid accepting localized
+ // weekdays here and take only its length to decide which datetime format we
+ // encounter here. The date isn't stored.
+ std::transform(weekday.begin(), weekday.end(), weekday.begin(), ::tolower);
+ std::array<char const * const, 7> c_weekdays = {{ "sun", "mon", "tue", "wed", "thu", "fri", "sat" }};
+ if (std::find(c_weekdays.begin(), c_weekdays.end(), weekday.substr(0,3)) == c_weekdays.end())
+ return false;
+
+ switch (weekday.length())
+ {
+ case 4:
+ // Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
+ if (weekday[3] != ',')
+ return false;
+ ss >> day >> month >> year >> timespec >> zone;
+ break;
+ case 3:
+ // Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
+ ss >> month >> day >> timespec >> year;
+ zone = "UTC";
+ break;
+ case 0:
+ case 1:
+ case 2:
+ return false;
+ default:
+ // Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
+ if (weekday[weekday.length() - 1] != ',')
+ return false;
+ ss >> datespec >> timespec >> zone;
+ auto const expldate = VectorizeString(datespec, '-');
+ if (expldate.size() != 3)
+ return false;
+ try {
+ size_t pos;
+ day = std::stoi(expldate[0], &pos);
+ if (pos != expldate[0].length())
+ return false;
+ year = 1900 + std::stoi(expldate[2], &pos);
+ if (pos != expldate[2].length())
+ return false;
+ strprintf(datespec, "%.4d-%.2d-%.2d", year, MonthConv(expldate[1].c_str()) + 1, day);
+ } catch (...) {
+ return false;
+ }
+ break;
+ }
+
+ if (ss.fail() || ss.bad() || !ss.eof())
+ return false;
+
+ if (zone != "GMT" && zone != "UTC" && zone != "Z") // RFC 822
+ {
+ // numeric timezones as a should of RFC 1123 and generally preferred
+ try {
+ size_t pos;
+ auto const z = std::stoi(zone, &pos);
+ if (z != 0 || pos != zone.length())
+ return false;
+ } catch (...) {
+ return false;
+ }
+ }
+
+ if (datespec.empty())
+ {
+ if (month.empty())
+ return false;
+ strprintf(datespec, "%.4d-%.2d-%.2d", year, MonthConv(month.c_str()) + 1, day);
+ }
+
+ std::string const datetime = datespec + ' ' + timespec;
+ struct tm Tm;
+ if (strptime(datetime.c_str(), "%Y-%m-%d %H:%M:%S", &Tm) == nullptr)
+ return false;
+ time = timegm(&Tm);
+ return true;
+}
+ /*}}}*/
+// FTPMDTMStrToTime - Converts a ftp modification date into a time_t /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FTPMDTMStrToTime(const char* const str,time_t &time)
+{
+ struct tm Tm;
+ // MDTM includes no whitespaces but recommend and ignored by strptime
+ if (strptime(str, "%Y %m %d %H %M %S", &Tm) == NULL)
+ return false;
+
+ time = timegm(&Tm);
+ return true;
+}
+ /*}}}*/
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