--[[

/*
 *  Baltisot
 *  Copyright (C) 1999-2008 Nicolas "Pixel" Noble
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

]]--

local session_expire = 60 * 60
local session_cleanup_throttle = 60 * 10
local last_cleanup = time()

local sessions = {}

local function generate_new_session()
    local ticket = GenTicket()
    sessions[ticket] = {
        data = {},
        access = time()
    }
    return ticket
end

local function clean_sessions()
    local t = time()
    
    if last_cleanup <= (t - session_cleanup_throttle) then
        local expired, k, v = t - session_expire
    
        for k, v in pairs(sessions) do
            if v.access <= expired then
                sessions[k] = nil
            end
        end
        
        last_cleanup = t
    end
end

function get_cookies(req)
    local cookies = {}
    if req.headers.Cookie then
        local cookie_strings = split(req.headers.Cookie, ";")
        local k, v
        
        for k, v in pairs(cookie_strings) do
            local cname, cvalue = string.match(v, "([^=]+)=(.+)")
            if cname then cookies[trim(cname)] = trim(cvalue) end
        end
    end
    return cookies
end

function set_cookie(res, key, val)
    res.cookies_path = "/"
    res.cookies = key .. "=" .. val
end

function get_session(req, res)
    local sid
    
    clean_sessions()
    
    sid = get_cookies(req)["sid"]
    
    if not sid or not sessions[sid] then
        sid = generate_new_session()
    end
    
    set_cookie(res, "sid", sid)
    sessions[sid].access = time()
    
    return sessions[sid].data, sid
end