/* This converts a time_t into a string time representation that is
year 2000 complient and timezone neutral */
string TimeRFC1123(time_t Date)
+{
+ return TimeRFC1123(Date, false);
+}
+string TimeRFC1123(time_t Date, bool const NumericTimezone)
{
struct tm Conv;
if (gmtime_r(&Date, &Conv) == NULL)
return "";
- char Buf[300];
- const char *Day[] = {"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
- const char *Month[] = {"Jan","Feb","Mar","Apr","May","Jun","Jul",
- "Aug","Sep","Oct","Nov","Dec"};
-
- snprintf(Buf, sizeof(Buf), "%s, %02i %s %i %02i:%02i:%02i GMT",Day[Conv.tm_wday],
- Conv.tm_mday,Month[Conv.tm_mon],Conv.tm_year+1900,Conv.tm_hour,
- Conv.tm_min,Conv.tm_sec);
- return Buf;
+ auto const posix = std::locale("C.UTF-8");
+ std::ostringstream datestr;
+ datestr.imbue(posix);
+ APT::StringView const fmt("%a, %d %b %Y %H:%M:%S");
+ std::use_facet<std::time_put<char>>(posix).put(
+ std::ostreambuf_iterator<char>(datestr),
+ datestr, ' ', &Conv, fmt.data(), fmt.data() + fmt.size());
+ if (NumericTimezone)
+ datestr << " +0000";
+ else
+ datestr << " GMT";
+ return datestr.str();
}
/*}}}*/
// ReadMessages - Read messages from the FD /*{{{*/
// ---------------------------------------------------------------------
/* This was lifted from the boa webserver which lifted it from 'wn-v1.07'
Made it a bit more robust with a few tolower_ascii though. */
-static int MonthConv(char *Month)
+static int MonthConv(char const * const Month)
{
switch (tolower_ascii(*Month))
{
method used to ignore the timezone and assume always UTC. */
bool RFC1123StrToTime(const char* const str,time_t &time)
{
- struct tm t;
+ 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("C.UTF-8");
- auto const parse_time = [&](char const * const s, bool const has_timezone) {
- std::istringstream ss(str);
- ss.imbue(posix);
- ss >> std::get_time(&t, s);
- if (has_timezone && ss.fail() == false)
- {
- std::string timezone;
- ss >> timezone;
- if (timezone.empty())
+ 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;
- if (timezone != "GMT" && timezone != "UTC" && timezone != "Z") // RFC 822
- {
- // numeric timezones as a should of RFC 1123 and generally preferred
- try {
- size_t pos;
- auto const zone = std::stoi(timezone, &pos);
- if (zone != 0 || pos != timezone.length())
- return false;
- } catch (...) {
- 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;
}
- t.tm_isdst = 0;
- return ss.fail() == false;
- };
+ break;
+ }
- bool const good =
- // Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
- parse_time("%a, %d %b %Y %H:%M:%S", true) ||
- // Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
- parse_time("%A, %d-%b-%y %H:%M:%S", true) ||
- // Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
- parse_time("%c", false); // "%a %b %d %H:%M:%S %Y"
- if (good == false)
+ if (ss.fail() || ss.bad() || !ss.eof())
return false;
- time = timegm(&t);
+ 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;
}
/*}}}*/
projects / apt.git / blobdiff