weblog-model.lua 47.3 KB
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module(..., package.seeall)

-- Load libraries
require("modelfunctions")
require("fs")
require("format")
require("validator")
require("luasql.postgres")

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local DatabaseName = "webproxylog"
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local DatabaseOwner = "weblogowner"
local DatabaseUser = "webloguser"

local path = "PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin "
local env
local con
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local configfile = "/etc/weblog/weblog.conf"
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local configcontent = fs.read_file(configfile) or ""
local config = format.parse_ini_file(configcontent, "") or {}
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local goodwordslist = "/etc/weblog/goodwords"
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local goodwords
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local badwordslist = "/etc/weblog/badwords"
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local badwords
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local ignorewordslist = "/etc/weblog/ignorewords"
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local ignorewords
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local files = {badwordslist, goodwordslist, ignorewordslist, configfile}
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local database_creation_script = {
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	"CREATE TABLE dbhistlog (logdatetime timestamp(3) without time zone NOT NULL, msgtext text)",
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	"CREATE TABLE pubweblog(sourcename character varying(40), clientip inet NOT NULL, clientuserid character varying(64) NOT NULL, logdatetime timestamp(3) without time zone NOT NULL, uri text NOT NULL, bytes bigint NOT NULL, reason text, score integer, shortreason text, badyesno int, deniedyesno int, bypassyesno int, wordloc text, goodwordloc text, selected boolean, id serial)",
	"CREATE TABLE pubweblog_history(sourcename character varying(40), clientip inet NOT NULL, clientuserid character varying(64) NOT NULL, logdatetime timestamp(3) without time zone NOT NULL, uri text NOT NULL, bytes bigint NOT NULL, reason text, score integer, shortreason text, badyesno int, deniedyesno int, bypassyesno int, wordloc text, goodwordloc text, selected boolean, id int)",
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	"CREATE TABLE weblog(sourcename character varying(40), clientip inet NOT NULL, clientuserid character varying(64) NOT NULL, logdatetime timestamp(3) without time zone NOT NULL, uri text NOT NULL, bytes bigint NOT NULL, reason text, score integer, shortreason text, badyesno int, deniedyesno int, bypassyesno int, wordloc text, goodwordloc text)",
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	"CREATE TABLE source (sourcename character varying(40) NOT NULL, method character varying(100) NOT NULL, userid character varying(32), passwd character varying(255), source character varying(255) NOT NULL, tzislocal boolean, enabled boolean)",
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	"CREATE TABLE usagestat (sourcename character varying(40) NOT NULL, date timestamp(0) without time zone NOT NULL, numrequest integer, numblock integer)",
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	"ALTER TABLE ONLY source ADD CONSTRAINT source_pkey PRIMARY KEY (sourcename)",
	"CREATE INDEX dbhistlogdatetimeidx ON dbhistlog USING btree (logdatetime)",
	"CREATE INDEX pubweblogclientdateidx ON pubweblog USING btree (logdatetime, clientuserid)",
	"CREATE INDEX pubweblogclientuserididx ON pubweblog USING btree (clientuserid)",
	"CREATE INDEX pubwebloglogdatetimeidx ON pubweblog USING btree (logdatetime)",
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	"CREATE INDEX pubweblog_historyclientdateidx ON pubweblog_history USING btree (logdatetime, clientuserid)",
	"CREATE INDEX pubweblog_historyclientuserididx ON pubweblog_history USING btree (clientuserid)",
	"CREATE INDEX pubweblog_historylogdatetimeidx ON pubweblog_history USING btree (logdatetime)",
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	"GRANT SELECT ON dbhistlog TO "..DatabaseUser,
	"GRANT SELECT ON pubweblog TO "..DatabaseUser,
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	"GRANT SELECT ON pubweblog_history TO "..DatabaseUser,
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	"GRANT SELECT, UPDATE, INSERT, DELETE ON source TO "..DatabaseUser,
	"GRANT SELECT ON usagestat TO "..DatabaseUser,
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}

-- ################################################################################
-- DATABASE FUNCTIONS

local function assert (v, m)
	if not v then
		m = m or "Assertion failed!"
		error(m, 0)
	end
	return v, m
end

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-- Escape special characters in sql statements and truncate to length
local escape = function(sql, length)
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	sql = sql or ""
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	if length then sql = string.sub(sql, 1, length) end
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	sql = string.gsub(sql, "'", "''")
	return string.gsub(sql, "\\", "\\\\")
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end

-- List the postgres databases on this system
local listdatabases = function()
	local dbs = {}
	local cmd = path.."psql -U postgres -tl 2>&1"
	local f = io.popen(cmd)
	local result = f:read("*a") or ""
	f:close()
	for line in string.gmatch(result, "[^\n]+") do
		dbs[#dbs+1] = string.match(line, "^ (%S+)")
	end
	return dbs
end

-- Create the necessary database
local createdatabase = function(password)
	local result = {}

	-- First, create the users
	local cmd = path..'psql -U postgres -c "CREATE USER '..DatabaseOwner..' WITH PASSWORD \''..password..'\'" 2>&1'
	local f = io.popen(cmd)
	table.insert(result, f:read("*a"))
	f:close()
	cmd = path..'psql -U postgres -c "CREATE USER '..DatabaseUser..'" 2>&1'
	f = io.popen(cmd)
	table.insert(result, f:read("*a"))
	f:close()
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	-- Create the database
	cmd = path..'psql -U postgres -c "CREATE DATABASE '..DatabaseName..' WITH OWNER '..DatabaseOwner..'" 2>&1'
	f = io.popen(cmd)
	table.insert(result, f:read("*a"))
	f:close()
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	return table.concat(result, "\n")
end

-- Delete the database and roles
local deletedatabase = function()
	local result = {}

	local cmd = path..'psql -U postgres -c "DROP DATABASE '..DatabaseName..'" 2>&1'
	local f = io.popen(cmd)
	table.insert(result, f:read("*a"))
	f:close()
	cmd = path..'psql -U postgres -c "DROP ROLE '..DatabaseUser..'" 2>&1'
	f = io.popen(cmd)
	table.insert(result, f:read("*a"))
	f:close()
	cmd = path..'psql -U postgres -c "DROP ROLE '..DatabaseOwner..'" 2>&1'
	f = io.popen(cmd)
	table.insert(result, f:read("*a"))
	f:close()
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	return table.concat(result, "\n")
end

-- Run an SQL script
local runSQLscript = function(filename)
	-- Create the database
	local cmd = path..'psql -U postgres -f "'..filename..'" '..DatabaseName..' 2>&1'
	local f = io.popen(cmd)
	local result = f:read("*a") or ""
	f:close()
	-- Create the tables
	print (result)
	return result
end

-- Create the database and tables
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-- pg_dump -U postgres -c webproxylog > makeweblog.postgres
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--runSQLscript("/root/work/weblog/makeweblog.postgres")

local databaseconnect = function(username, password)
	if not con then
		-- create environment object
		env = assert (luasql.postgres())
		-- connect to data source
		con = assert (env:connect(DatabaseName, username, password))
	end
end

local databasedisconnect = function()
	if env then
		env:close()
		env = nil
	end
	if con then
		con:close()
		con = nil
	end
end

local logme = function(message)
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	local sql = string.format("INSERT INTO dbhistlog VALUES ('now', '%s')", escape(message))
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	local res = assert (con:execute(sql))
end

local listhistorylogentries = function()
	local entries = {}
	-- retrieve a cursor
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	cur = assert (con:execute"SELECT logdatetime, msgtext from dbhistlog ORDER BY logdatetime")
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	row = cur:fetch ({}, "a")
	while row do
		entries[#entries+1] = {logdatetime = row.logdatetime, msgtext = row.msgtext}
		row = cur:fetch (row, "a")
	end
	-- close everything
	cur:close()
	return entries
end

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local importlogentry = function(entry, sourcename)
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	if entry then
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		local sql = string.format("INSERT INTO weblog VALUES ('%s', '%s', '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s')",
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			escape(sourcename), escape(entry.clientip), escape(entry.clientuserid, 64):lower(),
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			escape(entry.logdatetime), escape(entry.URL), escape(entry.bytes), escape(entry.reason), escape(entry.score or "0"), escape(entry.shortreason), escape(entry.badyesno or "0"), escape(entry.deniedyesno or "0"), escape(entry.bypassyesno or "0"), escape(entry.wordloc), escape(entry.goodwordloc))
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		local res = assert (con:execute(sql))
	end
end

local listsourceentries = function(sourcename)
	local sources = {}
	-- retrieve a cursor
	local sql = "SELECT sourcename, method, userid, passwd, source, tzislocal, enabled FROM source"
	if sourcename then
		sql = sql .. " WHERE sourcename='" .. escape(sourcename) .. "'"
	end
	sql = sql .. " ORDER BY sourcename"
	cur = assert (con:execute(sql))
	row = cur:fetch ({}, "a")
	while row do
		row.tzislocal = (row.tzislocal == "t")
		row.enabled = (row.enabled == "t")
		sources[#sources+1] = row
		row = cur:fetch ({}, "a")
	end
	cur:close()
	return sources
end

local importsourceentry = function(source)
	local sql = string.format("INSERT INTO source VALUES ('%s', '%s', '%s', '%s', '%s', '%s', '%s')",
		escape(source.sourcename), escape(source.method), escape(source.userid), escape(source.passwd),
		escape(source.source), escape(tostring(source.tzislocal):upper()), escape(tostring(source.enabled):upper()))
	local res = assert (con:execute(sql))
	return res
end

local updatesourceentry = function(source)
	local sql = string.format("UPDATE source SET method='%s', userid='%s', passwd='%s', source='%s', tzislocal='%s', enabled='%s' WHERE sourcename='%s'",
		escape(source.method), escape(source.userid), escape(source.passwd), escape(source.source),
		escape(tostring(source.tzislocal):upper()), escape(tostring(source.enabled):upper()),
		escape(source.sourcename))
	local res = assert (con:execute(sql))
	return res
end

local deletesourceentry = function(sourcename)
	local sql = string.format("DELETE FROM source WHERE sourcename='%s'", escape(sourcename))
	local res = assert (con:execute(sql))
	return res
end

-- Generate usage statistics from weblog and blocklog
local updateusagestats = function()
	-- update the usagestat table from weblog
	-- (will result in multiple rows where logs rotated on partial hours)
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	local sql = "insert into usagestat select weblog.sourcename, " ..
		"date_trunc('hour', weblog.logdatetime) as date, " ..
		"count(*), SUM(deniedyesno) from weblog group by sourcename,date"
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	local res = assert (con:execute(sql))
end

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-- Move weblog into pubweblog, and truncate weblog
local importpubweblog = function()
	local sql = "ANALYZE"
	res = assert (con:execute(sql))

	-- Move weblog to pubweblog
	sql= "insert into pubweblog select * from weblog"
	res = assert (con:execute(sql))
	logme("importpubweblog imported " .. res .. " new rows into database.")

	-- Truncate the staging table
	assert (con:execute("truncate weblog"))
	logme("truncated staging table")
end

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-- Delete useage stats from more than a year ago
local groomusagestat = function()
	local res = assert (con:execute("delete from usagestat where " ..
		"date < (now() - INTERVAL '1 year')"))
	logme("removed " .. res .. " old usage status lines")
end

-- Delete history log information from more than a month ago
local groomdbhistlog = function()
	local res = assert (con:execute("delete from dbhistlog where " ..
		"logdatetime < (now() - INTERVAL '1 month')"))
	logme("removed " .. res .. " old dbhistlog lines")
end

-- Delete old junk from pub tables
local groompublogs = function()
	local purgedays = config.purgedays or 30
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	local now = os.time()

	local temp = os.date("%Y-%m-%d %H:%M:%S", now - purgedays*86400)
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	logme("Purgedate is " .. temp .. ". Nothing will exist in pubweblog from before purgedate.")
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	-- Move flagged records to histoy and then purge anything older than purgedate
	sql = "Insert into pubweblog_history select * from pubweblog where logdatetime < '" .. temp .."' and (badyesno > 0 or deniedyesno > 0 or bypassyesno > 0 or selected = 'true')"
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	res = assert (con:execute(sql))
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	logme("Moved " .. res .. " old records to history")
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	sql = "Delete from pubweblog where logdatetime < '" .. temp .."'"
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	res = assert (con:execute(sql))
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	logme("Deleted " .. res .. " old records from pubweblog")
	
	sql = "delete from pubweblog_history where logdatetime < (now() - INTERVAL '1 year')"
	res = assert (con:execute(sql))
	logme("Deleted " .. res .. " old records from pubweblog_history")
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end

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local generatewhereclause = function(clientuserid, starttime, endtime, clientip, badyesno, deniedyesno, bypassyesno, score, urisearch, selected)
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	local sql = ""
	local where = {}
	if clientuserid and clientuserid ~= "" then
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		where[#where+1] = "clientuserid LIKE '%"..escape(clientuserid).."%'"
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	end
	if starttime and starttime ~= "" then
		where[#where+1] = "logdatetime >= '"..escape(starttime).."'"
	end
	if endtime and endtime ~= "" then
		where[#where+1] = "logdatetime <= '"..escape(endtime).."'"
	end
	if clientip and clientip ~= "" then
		where[#where+1] = "clientip = '"..escape(clientip).."'"
	end
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	if badyesno then
		where[#where+1] = "badyesno = '1'"
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	end
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	if deniedyesno then
		where[#where+1] = "deniedyesno = '1'"
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	end
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	if bypassyesno then
		where[#where+1] = "bypassyesno = '1'"
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	end
	if score and score ~= "" then
		where[#where+1] = "score >= '"..escape(score).."'"
	end
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	if urisearch and urisearch ~= "" then
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	    	where[#where+1] = "lower(uri) LIKE '%"..escape(urisearch).."%'"
	end
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	if selected then
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		where[#where+1] = "selected = 'true'"
	end
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	if #where > 0 then
		sql = " WHERE " .. table.concat(where, " AND ")
	end
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	return sql
end

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local listlogentries = function(activelog, clientuserid, starttime, endtime, clientip, badyesno, deniedyesno, bypassyesno, score, urisearch, sortby, selected)
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	local entries = {}
	-- retrieve a cursor
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	local sql = "SELECT * FROM "..activelog
	sql = sql .. generatewhereclause(clientuserid, starttime, endtime, clientip, badyesno, deniedyesno, bypassyesno, score, urisearch, selected)
	sql = sql .. " ORDER BY "..sortby
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	cur = assert (con:execute(sql))
	row = cur:fetch ({}, "a")
	while row do
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		if config.shorturi == "true" then
			shorturi=string.gsub(row.uri, "[;?].*", "...")
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		end
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		entries[#entries+1] = {sourcename=row.sourcename, clientip=row.clientip, clientuserid=row.clientuserid, logdatetime=row.logdatetime, uri=row.uri, shorturi=shorturi, bytes=row.bytes, reason=row.reason, score=row.score, shortreason=row.shortreason, badyesno=row.badyesno, deniedyesno=row.deniedyesno, bypassyesno=row.bypassyesno, wordloc=row.wordloc, id=row.id, selected=row.selected }
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		if (config.shortreason ~= "true") then
			entries[#entries].shortreason = nil
		end
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		row = cur:fetch (row, "a")
	end
	-- close everything
	cur:close()
	return entries
end

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local groupflaggedlogentries = function(starttime, endtime, groupby)
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	groupby = groupby or "clientuserid"
	local entries = {}
	-- retrieve a cursor
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	--local sql = "SELECT "..groupby..", count(*) AS numblock, max(score) AS maxscore FROM pubweblog"
	local sql = "SELECT "..groupby..", COUNT(*) as numrecords, SUM(CASE WHEN (bypassyesno > '0' OR deniedyesno > '0' OR badyesno > '0') THEN 1 ELSE 0 END) as numflagged, sum(score) AS numhits, sum(CASE WHEN deniedyesno > '0' THEN 1 ELSE 0 END) AS numdenied, sum(CASE WHEN bypassyesno > '0' THEN 1 ELSE 0 END) AS numbypassed, max(score) as maxscore from pubweblog"
	--sql = sql .. generatewhereclause(nil, starttime, endtime) .. " AND deniedyesno > '0'"
	sql = sql .. generatewhereclause(nil, starttime, endtime)
	--sql = sql .. " GROUP BY "..groupby.. " ORDER BY numblock DESC"
	sql = sql .. " GROUP BY " ..groupby.. " ORDER BY numflagged DESC"
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	cur = assert (con:execute(sql))
	row = cur:fetch ({}, "a")
	while row do
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		--entries[#entries+1] = {numblock=row.numblock, maxscore=row.maxscore}
		entries[#entries+1] = {numrecords=row.numrecords, numflagged=row.numflagged, numhits=row.numhits, numdenied=row.numdenied, numbypassed=row.numbypassed, maxscore=row.maxscore}
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		entries[#entries][groupby] = row[groupby]
		row = cur:fetch (row, "a")
	end
	-- close everything
	cur:close()
	return entries
end

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local listusagestats = function()
	local entries = {}
	-- retrieve a cursor
	local sql = "SELECT sourcename, date, sum(numrequest) AS numrequest, sum(numblock) AS numblock " ..
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		"FROM usagestat GROUP BY sourcename, date ORDER BY date, sourcename"
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	cur = assert (con:execute(sql))
	row = cur:fetch ({}, "a")
	while row do
		entries[#entries+1] = {sourcename=row.sourcename, date=row.date, numrequest=row.numrequest, numblock=row.numblock}
		row = cur:fetch (row, "a")
	end
	-- close everything
	cur:close()
	return entries
end

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local testdatabaseentry = function(datatype, value)
	local success = true
	local errtxt
	local sql = "CREATE TEMP TABLE testing ( test "..escape(datatype).." DEFAULT '"..escape(value).."' ) ON COMMIT DROP"
	local res, err = pcall(function()
		assert (con:execute(sql))
	end)
	if not res then
		success = false
		errtxt = string.gsub(err or "", "\n.*", "")
	end
	return success, errtxt
end

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local convertdatabaseentry = function(datatype, value)
	local success = true
	local errtxt
	local result = value
	local res, err = pcall(function()
		local sql = "CREATE TEMP TABLE testing ( test "..escape(datatype).." )"
		assert (con:execute(sql))
		sql = "INSERT INTO testing VALUES ('"..value.."')"
		assert (con:execute(sql))
		sql = "SELECT * FROM testing"
		local cur = assert (con:execute(sql))
		local row = cur:fetch ({}, "a")
		if row then
			result = row.test
		end
	end)
	if not res then
		success = false
		errtxt = string.gsub(err or "", "\n.*", "")
	end
	local res, err = pcall(function()
		local sql = "DROP TABLE testing"
		assert (con:execute(sql))
	end)
	return success, errtxt, result
end

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local printtableentries = function(tablename)
	-- retrieve a cursor
	local count = 0
	cur = assert (con:execute("SELECT * from "..tablename))
	-- print all rows, the rows will be indexed by field names
	row = cur:fetch ({}, "a")
	while row do
		count = count + 1
		for name,val in pairs(row) do
			APP.logevent(name.." = "..val..", ")
		end
		row = cur:fetch (row, "a")
	end
	-- close everything
	cur:close()
	APP.logevent("Table "..tablename.." contains "..count.." rows")
end

-- ################################################################################
-- LOG FILE FUNCTIONS

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local function checkwords(logentry)
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	local goodwordloc={}
	local badwordloc={}
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	local wrdcnt=0
	local isbad=0
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	--check for ignored records first
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	for i,thisline in ipairs(ignorewords) do
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		if not thisline then
			break
		end
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		_,instcnt = string.lower(logentry.URL):gsub(thisline, " ")
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		if instcnt ~= 0 then
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			logentry.ignoreme = true
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			--logme("ignoring...")
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			break
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		end
	end

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	if not logentry.ignoreme then
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		--proceed with record analysis
		for i,thisline in ipairs(badwords) do
			if not thisline then
				break
			end
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			_,instcnt = string.lower(logentry.URL):gsub(thisline, " ")
			if instcnt ~= 0 then
				-- logme("instcnt =  "..instcnt)
				isbad=1
				wrdcnt= wrdcnt + instcnt
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				badwordloc[#badwordloc+1] = thisline
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			end
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		end
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		--check for DansGuardian actions
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		if (logentry.reason and logentry.reason ~= "") then
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			if string.find(logentry.reason,"DENIED") then
				-- logme("*Denied*")
				logentry.deniedyesno=1
			elseif string.find(logentry.URL,"GBYPASS") then
				-- logme("GBYPASS")
				logentry.bypassyesno=1
			elseif string.find(logentry.reason,"OVERRIDE") then
				-- logme("*OVERRIDE*")
				logentry.bypassyesno=1
			end
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		end
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		--check for Squark actions
		if (logentry.squarkaction and logentry.squarkaction ~= "") then
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			--logme("squarkaction="..logentry.squarkaction)
			if string.find(logentry.squarkaction, "blocked") then
				logentry.deniedyesno=1
			elseif string.find(logentry.squarkaction,"overridden") then
				logentry.bypassyesno=1
			end
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		end

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		for i,goodline in ipairs(goodwords) do
			if not goodline then
				break
			end
			_,instcnt = string.lower(logentry.URL):gsub(goodline, " ")
			--if string.find(logentry.URL,goodline) then
			if instcnt ~= 0 then
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				if wrdcnt >= instcnt then
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					wrdcnt = wrdcnt - instcnt
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				else
					wrdcnt = 0
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				end
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				goodwordloc[#goodwordloc+1] = goodline
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			end
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		end
	end
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	-- Reset bad to reduce number of bad hits if score is zero
	-- if wrdcnt == 0 then
	-- isbad=0
	-- end
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	logentry.score=wrdcnt
	logentry.badyesno=isbad
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	logentry.wordloc=table.concat(badwordloc,"|")
	logentry.gwordloc=table.concat(goodwordloc,"|")
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end

local function parsesquidlog(line)
	-- Format of squid log (space separated):
	-- time elapsed remotehost code/status bytes method URL rfc931 peerstatus/peerhost
	local words = {}

	for word in string.gmatch(line, "%S+") do
		words[#words+1] = word
	end

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	local logentry = {logdatetime=words[1],
		elapsed=words[2],
		clientip=words[3],
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		code=string.match(words[4] or "", "^[^/]*"),
		status=string.match(words[4] or "", "[^/]*$"),
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		bytes=words[5],
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		method=words[6],
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		URL=words[7],
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		clientuserid=words[8],
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		peerstatus=string.match(words[9] or "", "^[^/]*"),
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		peerhost=string.match(words[9] or "", "[^/]*$"),
		squarkcategory=string.match(words[11] or "", "^[^,]*"),
		squarkaction=string.match(words[11] or "", "[^,]*$")}
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	checkwords(logentry)
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	-- Don't care about local requests (from DG) (this check also removes blank lines)
	if logentry.clientip and logentry.clientip ~= "127.0.0.1" then
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		logentry.logdatetime = os.date("%Y-%m-%d %H:%M:%S", logentry.logdatetime)..string.match(logentry.logdatetime, "%..*")
		return logentry
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	end
	return nil
end

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local function parsedglog(line)
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	local words = format.string_to_table(line, "\t")
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	local logentry = {logdatetime=words[1],
			clientuserid=words[2],
			clientip=words[3],
			URL=words[4],
			reason=words[5],
			method=words[6],
			bytes=words[7],
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			shortreason=words[9],
			deniedyesno=1}
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	checkwords(logentry)
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	if logentry.reason and logentry.reason ~= "" then
           	if logentry.shortreason == "" then
           		logentry.shortreason = logentry.reason
           	end
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		--logentry.score = string.match(logentry.reason, "^.*: ([0-9]+) ")
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		logentry.logdatetime = string.gsub(logentry.logdatetime, "%.", "-")
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	   	return logentry
	end
	return nil
end

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-- ################################################################################
-- DOWNLOAD FILE FUNCTIONS

-- must do apk_add wget first

local connecttosource = function(source, cookiesfile)
	local success = false
	logme("Connecting to source "..source.sourcename)
	if source.method == "http" or source.method == "https" then
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		fs.write_file(cookiesfile, "password="..source.passwd.."&userid="..source.userid.."&Logon=Logon")
		local cmd = "wget -O - --no-check-certificate --save-cookies "..cookiesfile.." --keep-session-cookies --post-file '"..cookiesfile.."' '"..source.method.."://"..format.escapespecialcharacters(source.source).."/cgi-bin/acf/acf-util/logon/logon' 2>/dev/null"
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		local f = io.popen(cmd)
		local resultpage = f:read("*a")
		f:close()
		if resultpage == "" then
			logme("Failed to connect to "..source.sourcename)
		elseif string.find(resultpage, "Log in") then
			logme("Failed to log in to "..source.sourcename)
		else
			success = true
		end
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	elseif source.method == "local" then
		success = true
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	end
	return success
end

local getlogcandidates = function(source, cookiesfile)
	local candidates = {}
	if source.method == "http" or source.method == "https" then
		local cmd = "wget -O - --no-check-certificate --load-cookies "..cookiesfile.." '"..source.method.."://"..source.source.."/cgi-bin/acf/alpine-baselayout/logfiles/status' 2>/dev/null"
		local f = io.popen(cmd)
		local resultpage = f:read("*a")
		f:close()
		for file in string.gmatch(resultpage, "download%?name=([^\"]+)") do
			candidates[#candidates+1] = file
		end
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	elseif source.method == "local" then
		candidates = fs.find_files_as_array(nil, source.source)
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	end
	return candidates
end

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local openlogfile = function(source, cookiesfile, logfile)
	local handle
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	if source.method == "http" or source.method == "https" then
		local cmd = "wget -O - --no-check-certificate --load-cookies "..cookiesfile.." --post-data 'name="..logfile.."' '"..source.method.."://"..source.source.."/cgi-bin/acf/alpine-baselayout/logfiles/download' 2>/dev/null"
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		if string.find(logfile, "%.gz$") then
			cmd = cmd.." | gunzip -c"
		end
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		handle = io.popen(cmd)
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	elseif source.method == "local" then
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		if string.find(logfile, "%.gz$") then
			local cmd = "gunzip -c "..logfile
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			handle = io.popen(cmd)
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		else
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			handle = io.open(logfile)
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		end
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	end
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	return handle
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end

local deletelogfile = function(source, cookiesfile, logfile)
	if source.method == "http" or source.method == "https" then
		local cmd = "wget -O - --no-check-certificate --load-cookies "..cookiesfile.." --post-data 'name="..logfile.."' '"..source.method.."://"..source.source.."/cgi-bin/acf/alpine-baselayout/logfiles/delete' 2>/dev/null"
		local f = io.popen(cmd)
		f:close()
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	elseif source.method == "local" then
		os.remove(logfile)
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	end
end

-- ################################################################################
-- PUBLIC FUNCTIONS

function getsourcelist()
	local retval = cfe({ type="list", value={}, label="Weblog Source List" })
	local res, err = pcall(function()
		databaseconnect(DatabaseUser)
		retval.value = listsourceentries()
		databasedisconnect()
	end)
	if not res then
		retval.errtxt = err
	end

	return retval
end

function getsource(sourcename)
	local sourcedata = getnewsource()
	sourcedata.value.sourcename.value = sourcename
	sourcedata.value.sourcename.errtxt = "Source name does not exist"

	local res, err = pcall(function()
		databaseconnect(DatabaseUser)
		local sourcelist = listsourceentries()
		databasedisconnect()
		for i,source in ipairs(sourcelist) do
			if source.sourcename == sourcename then
				sourcedata.value.sourcename.errtxt = nil
				for name,val in pairs(source) do
					if sourcedata.value[name] then
						sourcedata.value[name].value = val
					end
				end
				break
			end
		end
	end)
	if not res then
		sourcedata.errtxt = err
	end

	return sourcedata
end

local validatesource = function(sourcedata)
	local success = modelfunctions.validateselect(sourcedata.value.method)
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	local test = {"sourcename", "source"}
	if sourcedata.value.method.value ~= "local" then
		test[#test+1] = "userid"
		test[#test+1] = "passwd"
	end
	for i,name in ipairs(test) do
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		if sourcedata.value[name].value == "" then
			sourcedata.value[name].errtxt = "Cannot be empty"
			success = false
		end
	end

	return success
end

function updatesource(sourcedata)
	local success = validatesource(sourcedata)
	sourcedata.errtxt = "Failed to update source"
	if success then
		local source = {}
		for name,val in pairs(sourcedata.value) do
			source[name] = val.value
		end

		local res, err = pcall(function()
			databaseconnect(DatabaseUser)
			sourcedata.descr = updatesourceentry(source)
			databasedisconnect()
			sourcedata.errtxt = nil
		end)
		if not res and err then
			sourcedata.errtxt = sourcedata.errtxt .. "\n" .. err
		end
	end

	return sourcedata
end

function getnewsource()
	local source = {}
	source.sourcename = cfe({ label="Source Name" })
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	source.method = cfe({ type="select", value="local", label="Method", option={"http", "https", "local"} })
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	source.userid = cfe({ label="UserID" })
	source.passwd = cfe({ label="Password" })
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	source.source = cfe({ value="/var/log", label="Source Location / Address" })
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	source.tzislocal = cfe({ type="boolean", value=false, label="Using local timezone" })
	source.enabled = cfe({ type="boolean", value=false, label="Enabled" })
	return cfe({ type="group", value=source, label="Source" })
end

function createsource(sourcedata)
	local success = validatesource(sourcedata)
	sourcedata.errtxt = "Failed to create source"
	if success then
		local source = {}
		for name,val in pairs(sourcedata.value) do
			source[name] = val.value
		end
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		-- remove spaces from sourcename
		source.sourcename = string.gsub(source.sourcename, "%s+$", "")
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		local res, err = pcall(function()
			databaseconnect(DatabaseUser)
			sourcedata.descr = importsourceentry(source)
			databasedisconnect()
			sourcedata.errtxt = nil
		end)
		if not res and err then
			sourcedata.errtxt = sourcedata.errtxt .. "\n" .. err
		end
	end

	return sourcedata
end

function deletesource(sourcename)
	local result = cfe({ errtxt="Failed to delete source", label="Delete source result" })
	local res, err = pcall(function()
		databaseconnect(DatabaseUser)
		local number = deletesourceentry(sourcename)
		databasedisconnect()
		if number > 0 then
			result.errtxt = nil
			result.value = "Source Deleted"
		end
	end)
	if not res and err then
		result.errtxt = result.errtxt .. "\n" .. err
	end
	return result
end

function testsource(sourcename)
	local result = cfe({ label="Test source result" })

	-- temporary override of logme function to capture messages to result.value
	result.value = {}
	local temp = logme
	logme = function(message) table.insert(result.value, message) end

	local cookiesfile = "/tmp/cookies-"..tostring(os.time())
	local res, err = pcall(function()
		databaseconnect(DatabaseUser)
		local sources = listsourceentries(sourcename)
		databasedisconnect()
		if #sources < 1 then
			result.errtxt = "Failed to find source"
		else
			local source = sources[1]
			-- run the test
			if connecttosource(source, cookiesfile) then
				local files = getlogcandidates(source, cookiesfile)
				if #files == 0 then
					logme("No log files found")
				else
					for i,file in ipairs(files) do
						logme("Found log file "..file)
					end
				end
			end
		end
	end)
	if not res then
		result.errtxt = "Failed to connect to source"
		if err then
			result.errtxt = result.errtxt .. "\n" .. err
		end
	end
	os.remove(cookiesfile)

	-- fix the result
	result.value = table.concat(result.value, "\n") or ""
	logme = temp

	return result
end

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-- import a logfile and delete logfile after
local function importlogfile(source, cookiesfile, file, parselog_func)
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	logme("Getting " .. file )
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	local loghandle = openlogfile(source, cookiesfile, file)
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	logme("Processing " .. file )
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	local res, err = pcall(function()
		con:execute("START TRANSACTION")
		for line in loghandle:lines() do
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			assert(con:execute("SAVEPOINT before_line"))
			local res2, err2 = pcall(function()
				local logentry = parselog_func(line)
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				importlogentry(logentry, source.sourcename)
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			end)
			if not res2 then
				if (config.stoponerror == "true") then
					pcall(function() con:execute("ROLLBACK") end)
				else
					assert(con:execute("ROLLBACK TO before_line"))
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					con:execute("COMMIT")
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				end
				pcall(function() logme("Exception on line:"..line) end)
				if err2 then
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					pcall(function() logme(err2) end)
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				end
				if (config.stoponerror == "true") then
					assert(res2, "Import halted on exception")
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				else
					con:execute("START TRANSACTION")
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				end
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			else
				assert(con:execute("RELEASE SAVEPOINT before_line"))
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			end
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		end
		con:execute("COMMIT")
	end)
	if not res then
		pcall(function() con:execute("ROLLBACK") end)
		if err then
			pcall(function() logme(err) end)
		end
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	end
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	loghandle:close()
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	if res then
		logme("Deleting " .. file )
		deletelogfile(source, cookiesfile, file)
	end
	return res
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end

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function importlogs()
	local result = cfe({ label="Weblog Import Logs Result" })
	local count = 0
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	local success = true
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	local res, err = pcall(function()
		databaseconnect(DatabaseOwner, config.password)

		-- Download, parse, and import the logs
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		logme("Executing importlogs")
		logme("Analyzing...")
		local sql = "ANALYZE"
		res = assert (con:execute(sql))
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		-- Get the word lists
		goodwords = fs.read_file_as_array(goodwordslist) or {}
		badwords = fs.read_file_as_array(badwordslist) or {}
		ignorewords = fs.read_file_as_array(ignorewordslist) or {}

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		-- Determine sources
		local sources = listsourceentries(sourcename)
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		for i,source in ipairs(sources) do
			if source.enabled then
				logme("Getting logs from source " .. source.sourcename)
				local cookiesfile = "/tmp/cookies-"..tostring(os.time())
				if connecttosource(source, cookiesfile) then
					local files = getlogcandidates(source, cookiesfile)
					for j,file in ipairs(files) do
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						if string.match(file, "dansguardian/access%.log[%.%-]") then
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							count = count + 1
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							success = importlogfile(source, cookiesfile, file, parsedglog) and success
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						elseif string.match(file, "squid/access%.log[%.%-]") then
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							count = count + 1
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							success = importlogfile(source, cookiesfile, file, parsesquidlog) and success
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						end
					end
				end
				os.remove(cookiesfile)
			end
		end

		-- Process the logs
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		if success then
			updateusagestats()
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			importpubweblog()
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		end
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		-- Purge old database entries
		groomusagestat()
		groomdbhistlog()
		groompublogs()

		databasedisconnect()
	end)
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	if not res or not success then
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		result.errtxt = "Import Logs Failure"
		if err then
			pcall(function() logme(err) end)
			result.errtxt = result.errtxt .. "\n" .. err
		end
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		pcall(function() databasedisconnect() end)
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	end

	result.value = "Imported "..tostring(count).." logs"

	return result
end

function getactivitylog()
	local retval = cfe({ type="list", value={}, label="Weblog Activity Log" })
	local res, err = pcall(function()
		databaseconnect(DatabaseUser)
		retval.value = listhistorylogentries() or {}
		databasedisconnect()
	end)
	if not res then
		retval.errtxt = err
	end

	return retval
end

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function geteditselected()
	local result = {}
	result.select = cfe({ type="list", value={}, label="Entries to mark as selected" })
	result.deselect = cfe({ type="list", value={}, label="Entries to mark as selected" })
	return cfe({ type="group", value=result, label="Select / Deselect log entries" })
end

function editselected(data)
	local res, err = pcall(function()
		databaseconnect(DatabaseOwner)
		con:execute("START TRANSACTION")
		for i,sel in ipairs(data.value.select.value) do
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			assert (con:execute("UPDATE pubweblog SET selected = true WHERE id = '"..escape(sel).."'"))
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		end
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		for i,sel in ipairs(data.value.deselect.value) do
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			assert (con:execute("UPDATE pubweblog SET selected = false WHERE id = '"..escape(sel).."'"))
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		end
		con:execute("COMMIT")
		databasedisconnect()
	end)
	if not res then
		data.errtxt = err
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	end
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	return data
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end

function clearselected()
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	local retval = cfe({ label="Clear selected records" })
	local res, err = pcall(function()
		sql = "UPDATE pubweblog SET selected = false WHERE selected = true"
		databaseconnect(DatabaseOwner)
		assert (con:execute(sql))
		databasedisconnect()
		retval.value = "Cleared"
	end)
	if not res then
		retval.errtxt = err
	end
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	return retval
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end

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local validateweblogparameters = function(params)
	local success = modelfunctions.validateselect(params.value.activelog)
	success = modelfunctions.validateselect(params.value.sortby) and success
	if params.value.clientip.value ~= "" and string.find(params.value.clientip.value, "[^%d%.]") then
		params.value.clientip.errtxt = "Invalid IP Address"
		success = false
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	end
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	if not validator.is_integer(params.value.score.value) then
		params.value.score.errtxt = "Must be a number"
		success = false
	end
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	local res, err = pcall(function()
		databaseconnect(DatabaseUser)
		local s
		if params.value.starttime.value ~= "" then
			s,params.value.starttime.errtxt,params.value.starttime.value = convertdatabaseentry("TIMESTAMP", params.value.starttime.value)
			success = success and s
		end
		if params.value.endtime.value ~= "" then
			s,params.value.endtime.errtxt,params.value.endtime.value = convertdatabaseentry("TIMESTAMP", params.value.endtime.value)
			success = success and s
		end
		if params.value.focus.value ~= "" then
			s,params.value.focus.errtxt,params.value.focus.value = convertdatabaseentry("TIMESTAMP", params.value.focus.value)
			success = success and s
		end
		databasedisconnect()
	end)
	if not res and err then
		params.value.starttime.errtxt = err
		params.value.endtime.errtxt = err
		params.value.focus.errtxt = err
		success = false
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	end
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	return success
end
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function getweblogparameters()
	local c = getconfig()
	local result = {}
	result.activelog = cfe({ type="select", value="pubweblog", option={"pubweblog", "pubweblog_history"}, label="Active Weblog", seq=1 })
	result.starttime = cfe({ value=c.value.auditstart.value, label="Start Time", seq=2 })
	result.endtime = cfe({ value=c.value.auditend.value, label="End Time", seq=3 })
	result.clientuserid = cfe({ value="", label="User ID", seq=4 })
	result.clientip = cfe({ value="", label="Client IP", seq=5 })
	result.urisearch = cfe({ value="", label="URI Contains", descr="Retrieve records where the URI contains this word", seq=6 })
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	result.score = cfe({ value=c.value.score.value, label="Minimum Score", descr="Minimum score to search on", seq=7 })
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	result.sortby = cfe({ type="select", value=c.value.sortby.value, option=c.value.sortby.option, label="Sort By field", descr="Sort by this field when displaying records", seq=8 })
	result.badyesno = cfe({ type="boolean", value=c.value.badyesno.value, label="Show Suspect Records", descr="Limit search to records marked as suspect", seq=9 })
	result.deniedyesno = cfe({ type="boolean", value=c.value.deniedyesno.value, label="Show Denied Records", descr="Limit search to Denied URIs", seq=10 })
	result.bypassyesno = cfe({ type="boolean", value=c.value.bypassyesno.value, label="Show Bypass Records", descr="Limit search to Bypass attempts", seq=11 })
	result.selected = cfe({ type="boolean", value=false, label="Show Selected Records", descr="Limit search to records that have been selected", seq=12 })
	result.focus = cfe({ value="", label="Focus Time", seq=13 })
	return cfe({ type="group", value=result, label="Weblog Access Log" })
end
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function getweblog(result)
	local success = validateweblogparameters(result)
	result.value.log = cfe({ type="list", value={}, label="Weblog Access Log" })
	result.value.window = cfe({ value=config.window or "5", label="Time Window" })
	local err
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	if success then
		local res, err = pcall(function()
			databaseconnect(DatabaseUser)
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			result.value.log.value = listlogentries(result.value.activelog.value, result.value.clientuserid.value, result.value.starttime.value, result.value.endtime.value, result.value.clientip.value, result.value.badyesno.value, result.value.deniedyesno.value, result.value.bypassyesno.value, result.value.score.value, result.value.urisearch.value, result.value.sortby.value, result.value.selected.value ) or {}
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			databasedisconnect()
		end)
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		if not res then
			result.errtxt = err
		end
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	else
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		result.errtxt = "Invalid search parameters"
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	end
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	return result
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end

function getusagestats()
	local retval = cfe({ type="list", value={}, label="Weblog Usage Stats" })
	local res, err = pcall(function()
		databaseconnect(DatabaseUser)
		retval.value = listusagestats() or {}
		databasedisconnect()
	end)
	if not res then
		retval.errtxt = err
	end

	return retval
end

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function getauditstats()
	local result = {}
	result.auditstart = cfe({ value=config.auditstart or "", label="Audit Start Time" })
	result.auditend = cfe({ value=config.auditend or "", label="Audit End Time" })
	result.groupby = cfe({ value=config.groupby or "clientuserid", label="Group By" })
	result.stats = cfe({ type="list", value={}, label="Audit Block Statistics" })
	local res, err = pcall(function()
		if config.auditstart ~= "" and config.auditend ~= "" then
			databaseconnect(DatabaseUser)
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			result.stats.value = groupflaggedlogentries(config.auditstart, config.auditend, result.groupby.value) or {}
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			databasedisconnect()
		end
	end)
	return cfe({ type="group", value=result, errtxt=err, label="Weblog Audit Statistics" })
end

function completeaudit(timestamp)
	local conf = getconfig()
	conf.value.auditstart.value = conf.value.auditend.value
	local now = os.time()
	conf.value.auditend.value = timestamp or os.date("%Y-%m-%d %H:%M:%S", now - now%86400 - 86400)
	conf = updateconfig(conf)
	local retval = cfe({ value="Audit completed", label="Complete Audit Result" })
	if conf.errtxt then
		retval.value = ""
		retval.errtxt = "Failed to complete audit\n"..conf.errtxt.."\n"..conf.value.auditend.errtxt
	end
	return retval
end
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function getconfig()
	local result = {}
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	result.auditstart = cfe({ value=config.auditstart or "", label="Audit Start Time", seq=1 })
	result.auditend = cfe({ value=config.auditend or "", label="Audit End Time", seq=2 })
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	result.groupby = cfe({ type="select", value=config.groupby or "clientuserid", label="Group results by", option={"clientuserid", "clientip"}, descr="Display audit results based on user ID or IP", seq=3 })
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	result.score = cfe({ value=config.score or "0", label="Minimum Score", descr="Default minimum Score to search for", seq=4 })
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	result.sortby = cfe({ type="select", value=config.sortby or "logdatetime", label="Sort By field", option={"logdatetime", "logdatetime DESC", "clientuserid", "clientuserid DESC", "clientip", "clientip DESC", "bytes", "bytes DESC", "score", "score DESC", "reason"}, descr="Default sort order", seq=5 })
	result.badyesno = cfe({ type="boolean", value=(config.badyesno == "true"), label="Display Suspect Records", descr="By default, only show records flagged as suspect", seq=6 })
	result.deniedyesno = cfe({ type="boolean", value=(config.deniedyesno == "true"), label="Display Denied Records", descr="By default, only show records with denied URI", seq=7 })
	result.bypassyesno = cfe({ type="boolean", value=(config.bypassyesno == "true"), label="Display Bypass Records", descr="By default, only show records with bypass attempts", seq=8 })
	result.shorturi = cfe({ type="boolean", value=(config.shorturi == "true"), label="Truncate URLs", descr="You can limit the length of displayed URLs by enabling this option", seq=9 })
	result.shortreason = cfe({ type="boolean", value=(config.shortreason == "true"), label="Short Reason", descr="Display a short reason (dansguardian only)", seq=10 })
	result.window = cfe({ value=config.window or "5", label="Time Window", descr="Minutes of activity to display before and after selected block", seq=11 })
	result.purgedays = cfe({ value=config.purgedays or "30", label="Days before Purge", descr="Days to keep full history, regardless of audit", seq=12 })
	result.stoponerror = cfe({ type="boolean", value=(config.stoponerror == "true"), label="Stop on Error", descr="Stop import of logs if an error is encountered", seq=13})
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	return cfe({ type="group", value=result, label="Weblog Config" })
end

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local function validateconfig(newconfig)
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	local success = modelfunctions.validateselect(newconfig.value.groupby)
	success = modelfunctions.validateselect(newconfig.value.sortby) and success
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	if not validator.is_integer(newconfig.value.score.value) then
		newconfig.value.score.errtxt = "Must be a number"
		success = false
	end
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	if newconfig.value.window.value == "" then
		newconfig.value.window.errtxt = "Cannot be blank"
		success = false
	elseif not validator.is_integer(newconfig.value.window.value) then
		newconfig.value.window.errtxt = "Must be a number"
		success = false
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	end
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	if not validator.is_integer(newconfig.value.purgedays.value) then
		newconfig.value.purgedays.errtxt = "Must be a number"
		success = false
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	end
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	local res, err = pcall(function()
		databaseconnect(DatabaseUser)
		local s
		if newconfig.value.auditstart.value ~= "" then
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			s,newconfig.value.auditstart.errtxt,newconfig.value.auditstart.value = convertdatabaseentry("TIMESTAMP", newconfig.value.auditstart.value)
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			success = success and s
		end
		if newconfig.value.auditend.value ~= "" then
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			s,newconfig.value.auditend.errtxt,newconfig.value.auditend.value = convertdatabaseentry("TIMESTAMP", newconfig.value.auditend.value)
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			success = success and s
		end
		databasedisconnect()
	end)
	if not res and err then
		newconfig.value.auditstart.errtxt = err
		newconfig.value.auditend.errtxt = err
		success = false
	end
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	return success, newconfig
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end

function updateconfig(newconfig)
	local success = validateconfig(newconfig)
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	if success then
		configcontent = format.update_ini_file(configcontent, "", "auditstart", newconfig.value.auditstart.value)
		configcontent = format.update_ini_file(configcontent, "", "auditend", newconfig.value.auditend.value)
		configcontent = format.update_ini_file(configcontent, "", "window", newconfig.value.window.value)
		configcontent = format.update_ini_file(configcontent, "", "purgedays", newconfig.value.purgedays.value)
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		configcontent = format.update_ini_file(configcontent, "", "groupby", newconfig.value.groupby.value)
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		configcontent = format.update_ini_file(configcontent, "", "shorturi", tostring(newconfig.value.shorturi.value))
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		configcontent = format.update_ini_file(configcontent, "", "shortreason", tostring(newconfig.value.shortreason.value))
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		configcontent = format.update_ini_file(configcontent, "", "stoponerror", tostring(newconfig.value.stoponerror.value))
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		configcontent = format.update_ini_file(configcontent, "", "badyesno", tostring(newconfig.value.badyesno.value))
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		configcontent = format.update_ini_file(configcontent, "", "deniedyesno", tostring(newconfig.value.deniedyesno.value))
		configcontent = format.update_ini_file(configcontent, "", "bypassyesno", tostring(newconfig.value.bypassyesno.value))
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		configcontent = format.update_ini_file(configcontent, "", "score", tostring(newconfig.value.score.value))
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		configcontent = format.update_ini_file(configcontent, "", "sortby", tostring(newconfig.value.sortby.value))
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		fs.write_file(configfile, configcontent)
		config = format.parse_ini_file(configcontent, "") or {}
	else
		newconfig.errtxt = "Failed to update config"
	end

	return newconfig
end

function getnewadhocquery()
	local query = {}
	query.query = cfe({ label="Query select statement" })
	return cfe({ type="group", value=query, label="Ad-hoc Query" })
end

function adhocquery(query)
	local success = true
	query.value.query.value = query.value.query.value:lower()
	if query.value.query.value == "" then
		query.value.query.errtxt = "Empty select statement"
		success = false
	elseif not string.find(query.value.query.value, "^%s*select%s") then
		query.value.query.errtxt = "Must be a select statement"
		success = false
	end

	if success then
		local cur
		local res, err = pcall(function()
			databaseconnect(DatabaseUser)
			cur = assert (con:execute(query.value.query.value))
			databasedisconnect()
		end)
		if not res or not cur then
			query.value.query.errtxt = err or "Select failed"
			query.errtxt = "Query failed"
		else
			query.value.result = cfe({ type="list", value={}, label="Select result" })
			local result = query.value.result.value
			local row = cur:fetch ({}, "a")
			while row do
				result[#result+1] = {}
				for name,val in pairs(row) do
					result[#result][name] = val
				end
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				row = cur:fetch (row, "a")
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			end
			-- close everything
			cur:close()
		end
	else
		query.errtxt = "Query failed"
	end

	return query
end

function testdatabase()
	local retval = cfe({ type="boolean", value=false, label="Database present" })
	local dbs = listdatabases()
	for i,db in ipairs(dbs) do
		if db == DatabaseName then
			retval.value = true
			break
		end
	end
	return retval
end

function getnewdatabase()
	local database = {}
	local errtxt
	database.password = cfe({ label="Password" })
	database.password_confirm = cfe({ label="Password (confirm)" })
	local test = testdatabase()
	if test.value then
		errtxt = "Database already exists!"
		success = false
	end
	return cfe({ type="group", value=database, label="Create Database", errtxt=errtxt })
end

function create_database(database)
	local success = true
	local errtxt

	if database.value.password.value == "" or string.match(database.value.password.value, "'%s") then
		database.value.password.errtxt = "Invalid password"
		success = false
	end
	if database.value.password.value ~= database.value.password_confirm.value then
		database.value.password_confirm.errtxt = "Password does not match"
		success = false
	end
	local test = testdatabase()
	if test.value then
		errtxt = "Database already exists!"
		success = false
	end

	if success then
		errtxt = createdatabase(database.value.password.value)
		test = testdatabase()
		if not test.value then
			success = false
		else
			local res, err = pcall(function()
				databaseconnect(DatabaseOwner, database.value.password.value)
				for i,scr in ipairs(database_creation_script) do
					assert (con:execute(scr))
				end
				databasedisconnect()
				-- put the password in the config file for future use
				configcontent = format.update_ini_file(configcontent, "", "password", database.value.password.value)
				fs.write_file(configfile, configcontent)
				config = format.parse_ini_file(configcontent, "") or {}
			end)
			if not res then
				errtxt = err
				success = false
			end
		end
		if not success then
			deletedatabase()
		end
	end
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	if not success then
		database.errtxt = "Failed to create database"
		if errtxt then
			database.errtxt = database.errtxt.."\n"..errtxt
		end
	end

	return database
end
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function listfiles()
        local retval = cfe({ type="list", value={}, label="Weblog Files" })
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	for i,file in ipairs(files) do
		local details = fs.stat(file) or {}
		details.filename = file
		retval.value[#retval.value + 1] = details
	end
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        return retval
end
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function readfile(filename)
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	return modelfunctions.getfiledetails(filename, files)
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end
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function updatefile(filedetails)
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	return modelfunctions.setfiledetails(filedetails, files)
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end