90 lines
2.1 KiB
C++
90 lines
2.1 KiB
C++
#pragma once
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/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2020-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#include <maxscale/cppdefs.hh>
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#include <string>
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#include <time.h>
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#include <maxscale/debug.h>
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/**
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* @brief Return the current HTTP-date
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*
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* @return The RFC 1123 compliant date
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*/
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static inline std::string http_get_date()
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{
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time_t now = time(NULL);
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struct tm tm;
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char buf[200]; // Enough to store all dates
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gmtime_r(&now, &tm);
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strftime(buf, sizeof(buf), "%a, %d %b %y %T GMT", &tm);
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return std::string(buf);
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}
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/**
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* @brief Convert a time_t value into a HTTP-date string
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*
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* @param t Time to convert
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*
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* @return The time converted to a HTTP-date string
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*/
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static inline std::string http_to_date(time_t t)
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{
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struct tm tm;
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char buf[200]; // Enough to store all dates
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gmtime_r(&t, &tm);
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strftime(buf, sizeof(buf), "%a, %d %b %Y %T GMT", &tm);
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return std::string(buf);
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}
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/**
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* @brief Convert a HTTP-date string into time_t
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*
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* @param str HTTP-date formatted string to convert
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*
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* @return The time converted to time_t
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*/
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static inline time_t http_from_date(const std::string& str)
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{
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struct tm tm = {};
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/** First get the GMT time in time_t format */
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strptime(str.c_str(), "%a, %d %b %Y %T GMT", &tm);
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time_t t = mktime(&tm);
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/** Then convert it to local time by calculating the difference between
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* the local time and the GMT time */
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struct tm local_tm = {};
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struct tm gmt_tm = {};
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time_t epoch = 0;
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/** Call tzset() for the sake of portability */
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tzset();
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gmtime_r(&epoch, &gmt_tm);
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localtime_r(&epoch, &local_tm);
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time_t gmt_t = mktime(&gmt_tm);
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time_t local_t = mktime(&local_tm);
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/** The value of `(gmt_t - local_t)` will be the number of seconds west
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* from GMT. For timezones east of GMT, it will be negative. */
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return t - (gmt_t - local_t);
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}
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