libs: move http.protocol.{date,mime,conditionals} to luci-lib-httpprotoutils

[project/luci.git] / libs / luci-lib-httpprotoutils / luasrc / http / date.lua

diff --git a/libs/luci-lib-httpprotoutils/luasrc/http/date.lua b/libs/luci-lib-httpprotoutils/luasrc/http/date.lua
new file mode 100644 (file)
index 0000000..72f1bdb
--- /dev/null
+++ b/libs/luci-lib-httpprotoutils/luasrc/http/date.lua
@@ -0,0 +1,87 @@
+-- Copyright 2008 Freifunk Leipzig / Jo-Philipp Wich <jow@openwrt.org>
+-- Licensed to the public under the Apache License 2.0.
+
+-- This class contains functions to parse, compare and format http dates.
+module("luci.http.date", package.seeall)
+
+require("luci.sys.zoneinfo")
+
+
+MONTHS = {
+       "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
+       "Sep", "Oct", "Nov", "Dec"
+}
+
+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
+
+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
+
+function to_http(time)
+       return os.date( "%a, %d %b %Y %H:%M:%S GMT", time )
+end
+
+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