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-- Copyright 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
-- Licensed to the public under the Apache License 2.0.
--- LuCI http protocol implementation - date helper class.
-- This class contains functions to parse, compare and format http dates.
module("luci.http.protocol.date", package.seeall)
require("luci.sys.zoneinfo")
MONTHS = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
"Sep", "Oct", "Nov", "Dec"
}
--- Return the time offset in seconds between the UTC and given time zone.
-- @param tz Symbolic or numeric timezone specifier
-- @return Time offset to UTC in seconds
function tz_offset(tz)
if type(tz) == "string" then
-- check for a numeric identifier
local s, v = tz:match("([%+%-])([0-9]+)")
if s == '+' then s = 1 else s = -1 end
if v then v = tonumber(v) end
if s and v then
return s * 60 * ( math.floor( v / 100 ) * 60 + ( v % 100 ) )
-- lookup symbolic tz
elseif luci.sys.zoneinfo.OFFSET[tz:lower()] then
return luci.sys.zoneinfo.OFFSET[tz:lower()]
end
end
-- bad luck
return 0
end
--- Parse given HTTP date string and convert it to unix epoch time.
-- @param data String containing the date
-- @return Unix epoch time
function to_unix(date)
local wd, day, mon, yr, hr, min, sec, tz = date:match(
"([A-Z][a-z][a-z]), ([0-9]+) " ..
"([A-Z][a-z][a-z]) ([0-9]+) " ..
"([0-9]+):([0-9]+):([0-9]+) " ..
"([A-Z0-9%+%-]+)"
)
if day and mon and yr and hr and min and sec then
-- find month
local month = 1
for i = 1, 12 do
if MONTHS[i] == mon then
month = i
break
end
end
-- convert to epoch time
return tz_offset(tz) + os.time( {
year = yr,
month = month,
day = day,
hour = hr,
min = min,
sec = sec
} )
end
return 0
end
--- Convert the given unix epoch time to valid HTTP date string.
-- @param time Unix epoch time
-- @return String containing the formatted date
function to_http(time)
return os.date( "%a, %d %b %Y %H:%M:%S GMT", time )
end
--- Compare two dates which can either be unix epoch times or HTTP date strings.
-- @param d1 The first date or epoch time to compare
-- @param d2 The first date or epoch time to compare
-- @return -1 - if d1 is lower then d2
-- @return 0 - if both dates are equal
-- @return 1 - if d1 is higher then d2
function compare(d1, d2)
if d1:match("[^0-9]") then d1 = to_unix(d1) end
if d2:match("[^0-9]") then d2 = to_unix(d2) end
if d1 == d2 then
return 0
elseif d1 < d2 then
return -1
else
return 1
end
end
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