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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2014-2018 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _PASSENGER_STRINTTOOLS_DATE_PARSING_H_
#define _PASSENGER_STRINTTOOLS_DATE_PARSING_H_
#include <algorithm>
#include <time.h>
#include <cassert>
#include <cstring>
#include <StaticString.h>
#include <StrIntTools/StrIntUtils.h>
namespace Passenger {
inline bool skipImfFixdate_comment(const char **pos, const char *end);
inline bool parseImfFixdate_dayOfWeek(const char **pos, const char *end, struct tm &tm);
inline bool parseImfFixdate_date(const char **pos, const char *end, struct tm &tm);
inline bool parseImfFixdate_day(const char **pos, const char *end, struct tm &tm);
inline bool parseImfFixdate_month(const char **pos, const char *end, struct tm &tm);
inline bool parseImfFixdate_year(const char **pos, const char *end, struct tm &tm);
inline bool parseImfFixdate_time(const char **pos, const char *end, struct tm &tm, int &zone);
inline bool parseImfFixdate_hour(const char **pos, const char *end, struct tm &tm);
inline bool parseImfFixdate_minute(const char **pos, const char *end, struct tm &tm);
inline bool parseImfFixdate_second(const char **pos, const char *end, struct tm &tm);
inline bool parseImfFixdate_zone(const char **pos, const char *end, int &zone);
/**
* Parses an IMF-fixdate, as defined by RFC 7231 (while referencing RFC 5322).
* Returns whether parsing succeeded.
*/
inline bool
parseImfFixdate(const char *date, const char *end, struct tm &tm, int &zone) {
// We're not parsing the grammar exactly, but whatever.
// It's too complicated and nobody uses CFWS.
tm.tm_yday = -1;
tm.tm_isdst = 0;
if (!parseImfFixdate_dayOfWeek(&date, end, tm)) {
return false;
}
if (date == end || *date != ',') {
return false;
}
date++;
if (!parseImfFixdate_date(&date, end, tm)) {
return false;
}
return parseImfFixdate_time(&date, end, tm, zone);
}
/**
* Converts a parsed IMF-fixdate, as outputted by `parseImfFixdate()`,
* into a Unix timestamp.
*/
inline time_t
parsedDateToTimestamp(struct tm &tm, int zone) {
time_t timeUsingLocalTZ = mktime(&tm);
// tmUsingLocalTZ now contains tm interpreted as being in our local timezone instead of the intended UTC
// Example: 10 UTC interpreted as 10 GMT+1 instead of 11 GMT+1
#if !defined(sun) && !defined(__sun) && !defined(BOOST_OS_MACOS)
// tm_gmtoff = "seconds east of UTC", so the example 10 GMT+1 would now be corrected to (10+1) GMT+1
timeUsingLocalTZ += tm.tm_gmtoff;
#else
// Solaris doesn't have tm_gmtoff, so we calculate the current offset by converting to UTC (gmtime) and pretending
// that is local time again (mktime), resulting in a "corrected" timestamp that we can delta with the original timestamp.
// In the example: gmtime(10 GMT+1) = 9 UTC, interpreted as 9 GMT+1 gives use delta (10 - 9) = +1 to correct 10 GMT+1 with.
struct tm *tmAsUTC = gmtime(&timeUsingLocalTZ);
time_t utcUsingLocalTZ = mktime(tmAsUTC);
timeUsingLocalTZ += (timeUsingLocalTZ - utcUsingLocalTZ);
#endif
// The final result also needs to take into account the desired zone.
return timeUsingLocalTZ - (zone / 100 * 60 * 60 + zone % 100 * 60);
}
inline void
skipImfFixdate_FWS(const char **pos, const char *end) {
while (*pos < end && (**pos == '\r' || **pos == '\n' || **pos == ' ' || **pos == '\t')) {
(*pos)++;
}
}
inline bool
skipImfFixdate_CFWS(const char **pos, const char *end) {
while (*pos < end) {
skipImfFixdate_FWS(pos, end);
if (*pos == end || **pos != '(') {
break;
} else if (!skipImfFixdate_comment(pos, end)) {
return false;
}
}
return true;
}
inline bool
skipImfFixdate_comment(const char **pos, const char *end) {
assert(**pos == '(');
(*pos)++;
char *result = (char *) std::memchr(*pos, ')', end - *pos);
if (result == NULL) {
return false;
} else {
*pos = result + 1;
return true;
}
}
inline bool
parseImfFixdate_dayOfWeek(const char **pos, const char *end, struct tm &tm) {
if (!skipImfFixdate_CFWS(pos, end)) {
return false;
}
if (end - *pos >= 3) {
StaticString str(*pos, 3);
(*pos) += 3;
if (str == P_STATIC_STRING("Mon")) {
tm.tm_wday = 0;
} else if (str == P_STATIC_STRING("Tue")) {
tm.tm_wday = 1;
} else if (str == P_STATIC_STRING("Wed")) {
tm.tm_wday = 2;
} else if (str == P_STATIC_STRING("Thu")) {
tm.tm_wday = 3;
} else if (str == P_STATIC_STRING("Fri")) {
tm.tm_wday = 4;
} else if (str == P_STATIC_STRING("Sat")) {
tm.tm_wday = 5;
} else if (str == P_STATIC_STRING("Sun")) {
tm.tm_wday = 6;
} else {
return false;
}
return true;
} else {
return false;
}
}
inline bool
parseImfFixdate_date(const char **pos, const char *end, struct tm &tm) {
return parseImfFixdate_day(pos, end, tm)
&& parseImfFixdate_month(pos, end, tm)
&& parseImfFixdate_year(pos, end, tm);
}
inline bool
parseImfFixdate_day(const char **pos, const char *end, struct tm &tm) {
if (!skipImfFixdate_CFWS(pos, end)) {
return false;
}
const char *dayBegin = *pos;
while (*pos < end && **pos >= '0' && **pos <= '9') {
(*pos)++;
}
size_t size = *pos - dayBegin;
if (size == 0 || size > 2) {
return false;
}
if (!skipImfFixdate_CFWS(pos, end)) {
return false;
}
tm.tm_mday = stringToInt(StaticString(dayBegin, size));
return true;
}
inline bool
parseImfFixdate_month(const char **pos, const char *end, struct tm &tm) {
if (end - *pos >= 3) {
StaticString str(*pos, 3);
(*pos) += 3;
if (str == P_STATIC_STRING("Jan")) {
tm.tm_mon = 0;
} else if (str == P_STATIC_STRING("Feb")) {
tm.tm_mon = 1;
} else if (str == P_STATIC_STRING("Mar")) {
tm.tm_mon = 2;
} else if (str == P_STATIC_STRING("Apr")) {
tm.tm_mon = 3;
} else if (str == P_STATIC_STRING("May")) {
tm.tm_mon = 4;
} else if (str == P_STATIC_STRING("Jun")) {
tm.tm_mon = 5;
} else if (str == P_STATIC_STRING("Jul")) {
tm.tm_mon = 6;
} else if (str == P_STATIC_STRING("Aug")) {
tm.tm_mon = 7;
} else if (str == P_STATIC_STRING("Sep")) {
tm.tm_mon = 8;
} else if (str == P_STATIC_STRING("Oct")) {
tm.tm_mon = 9;
} else if (str == P_STATIC_STRING("Nov")) {
tm.tm_mon = 10;
} else if (str == P_STATIC_STRING("Dec")) {
tm.tm_mon = 11;
} else {
return false;
}
return true;
} else {
return false;
}
}
inline bool
parseImfFixdate_year(const char **pos, const char *end, struct tm &tm) {
if (!skipImfFixdate_CFWS(pos, end)) {
return false;
}
const char *yearBegin = *pos;
while (*pos < end && **pos >= '0' && **pos <= '9') {
(*pos)++;
}
size_t size = *pos - yearBegin;
if (size != 4) {
return false;
}
if (!skipImfFixdate_CFWS(pos, end)) {
return false;
}
tm.tm_year = stringToInt(StaticString(yearBegin, size)) - 1900;
return true;
}
inline bool
parseImfFixdate_time(const char **pos, const char *end, struct tm &tm, int &zone) {
if (!parseImfFixdate_hour(pos, end, tm)) {
return false;
}
if (*pos == end || **pos != ':') {
return false;
}
(*pos)++;
if (!parseImfFixdate_minute(pos, end, tm)) {
return false;
}
if (*pos == end) {
return false;
} else if (**pos == ':') {
(*pos)++;
if (!parseImfFixdate_second(pos, end, tm)) {
return false;
}
}
return parseImfFixdate_zone(pos, end, zone);
}
inline int
parseImfFixdate_timeComponent(const char **pos, const char *end) {
if (!skipImfFixdate_CFWS(pos, end)) {
return -1;
}
const char *begin = *pos;
while (*pos < end && **pos >= '0' && **pos <= '9') {
(*pos)++;
}
size_t size = *pos - begin;
if (size != 2) {
return -1;
}
if (!skipImfFixdate_CFWS(pos, end)) {
return -1;
}
return stringToInt(StaticString(begin, size));
}
inline bool
parseImfFixdate_hour(const char **pos, const char *end, struct tm &tm) {
int result = parseImfFixdate_timeComponent(pos, end);
if (result != -1 && result >= 0 && result <= 23) {
tm.tm_hour = result;
return true;
} else {
return false;
}
}
inline bool
parseImfFixdate_minute(const char **pos, const char *end, struct tm &tm) {
int result = parseImfFixdate_timeComponent(pos, end);
if (result != -1 && result >= 0 && result <= 59) {
tm.tm_min = result;
return true;
} else {
return false;
}
}
inline bool
parseImfFixdate_second(const char **pos, const char *end, struct tm &tm) {
int result = parseImfFixdate_timeComponent(pos, end);
// up to 60 to allow leap seconds
if (result != -1 && result >= 0 && result <= 60) {
tm.tm_sec = result;
return true;
} else {
return false;
}
}
inline bool
parseImfFixdate_zone(const char **pos, const char *end, int &zone) {
if (!skipImfFixdate_CFWS(pos, end)
|| *pos == end)
{
return false;
}
if (**pos == '+' || **pos == '-') {
// Time zone offset
int sign = (**pos == '+') ? 1 : -1;
(*pos)++;
if (*pos == end) {
return false;
}
const char *begin = *pos;
while (*pos < end && **pos >= '0' && **pos <= '9') {
(*pos)++;
}
size_t size = *pos - begin;
if (size != 4) {
return false;
}
zone = sign * stringToInt(StaticString(begin, size));
} else {
// obs-zone
StaticString str(*pos, std::min<size_t>(end - *pos, 3));
if (str.substr(0, 2) == P_STATIC_STRING("UT")
|| str == P_STATIC_STRING("UTC")
|| str == P_STATIC_STRING("GMT"))
{
zone = 0;
} else if (str == P_STATIC_STRING("EST")) {
zone = -500;
} else if (str == P_STATIC_STRING("EDT")) {
zone = -400;
} else if (str == P_STATIC_STRING("CST")) {
zone = -600;
} else if (str == P_STATIC_STRING("CDT")) {
zone = -500;
} else if (str == P_STATIC_STRING("MST")) {
zone = -700;
} else if (str == P_STATIC_STRING("MDT")) {
zone = -600;
} else if (str == P_STATIC_STRING("PST")) {
zone = -800;
} else if (str == P_STATIC_STRING("PDT")) {
zone = -700;
} else {
// No support for military zones
return false;
}
}
return true;
}
} // namespace Passenger
#endif /* _PASSENGER_STRINTTOOLS_DATE_PARSING_H_ */
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