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116 lines
2.7 KiB
Lua
116 lines
2.7 KiB
Lua
--[[
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HTTP protocol implementation for LuCI - date handling
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(c) 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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$Id: date.lua 3860 2008-12-06 03:18:14Z jow $
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]]--
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--- LuCI http protocol implementation - date helper class.
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-- This class contains functions to parse, compare and format http dates.
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module("luci.http.protocol.date", package.seeall)
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require("luci.sys.zoneinfo")
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MONTHS = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
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"Sep", "Oct", "Nov", "Dec"
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}
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--- Return the time offset in seconds between the UTC and given time zone.
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-- @param tz Symbolic or numeric timezone specifier
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-- @return Time offset to UTC in seconds
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function tz_offset(tz)
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if type(tz) == "string" then
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-- check for a numeric identifier
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local s, v = tz:match("([%+%-])([0-9]+)")
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if s == '+' then s = 1 else s = -1 end
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if v then v = tonumber(v) end
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if s and v then
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return s * 60 * ( math.floor( v / 100 ) * 60 + ( v % 100 ) )
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-- lookup symbolic tz
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elseif luci.sys.zoneinfo.OFFSET[tz:lower()] then
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return luci.sys.zoneinfo.OFFSET[tz:lower()]
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end
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end
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-- bad luck
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return 0
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end
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--- Parse given HTTP date string and convert it to unix epoch time.
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-- @param data String containing the date
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-- @return Unix epoch time
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function to_unix(date)
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local wd, day, mon, yr, hr, min, sec, tz = date:match(
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"([A-Z][a-z][a-z]), ([0-9]+) " ..
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"([A-Z][a-z][a-z]) ([0-9]+) " ..
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"([0-9]+):([0-9]+):([0-9]+) " ..
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"([A-Z0-9%+%-]+)"
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)
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if day and mon and yr and hr and min and sec then
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-- find month
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local month = 1
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for i = 1, 12 do
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if MONTHS[i] == mon then
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month = i
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break
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end
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end
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-- convert to epoch time
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return tz_offset(tz) + os.time( {
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year = yr,
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month = month,
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day = day,
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hour = hr,
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min = min,
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sec = sec
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} )
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end
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return 0
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end
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--- Convert the given unix epoch time to valid HTTP date string.
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-- @param time Unix epoch time
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-- @return String containing the formatted date
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function to_http(time)
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return os.date( "%a, %d %b %Y %H:%M:%S GMT", time )
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end
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--- Compare two dates which can either be unix epoch times or HTTP date strings.
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-- @param d1 The first date or epoch time to compare
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-- @param d2 The first date or epoch time to compare
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-- @return -1 - if d1 is lower then d2
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-- @return 0 - if both dates are equal
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-- @return 1 - if d1 is higher then d2
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function compare(d1, d2)
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if d1:match("[^0-9]") then d1 = to_unix(d1) end
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if d2:match("[^0-9]") then d2 = to_unix(d2) end
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if d1 == d2 then
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return 0
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elseif d1 < d2 then
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return -1
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else
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return 1
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end
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end
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