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if not modules then modules = { } end modules ['util-sql-logins'] = {
version = 1.001,
comment = "companion to lmx-*",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
if not utilities.sql then require("util-sql") end
local sql = utilities.sql
local sqlexecute = sql.execute
local sqlmakeconverter = sql.makeconverter
local format = string.format
local ostime = os.time
local formatter = string.formatter
local trace_logins = true
local report_logins = logs.reporter("sql","logins")
local logins = sql.logins or { }
sql.logins = logins
logins.maxnoflogins = logins.maxnoflogins or 10
logins.cooldowntime = logins.cooldowntime or 10 * 60
logins.purgetime = logins.purgetime or 1 * 60 * 60
logins.autopurge = true
local function checkeddb(presets,datatable)
return sql.usedatabase(presets,datatable or presets.datatable or "logins")
end
logins.usedb = checkeddb
local template = [[
CREATE TABLE IF NOT EXISTS %basename% (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(50) NOT NULL,
`time` int(11) DEFAULT '0',
`n` int(11) DEFAULT '0',
`state` int(11) DEFAULT '0',
PRIMARY KEY (`id`),
UNIQUE KEY `id_unique_index` (`id`),
UNIQUE KEY `name_unique_key` (`name`)
) DEFAULT CHARSET = utf8 ;
]]
local sqlite_template = [[
CREATE TABLE IF NOT EXISTS %basename% (
`id` INTEGER NOT NULL AUTO_INCREMENT,
`name` TEXT NOT NULL,
`time` INTEGER DEFAULT '0',
`n` INTEGER DEFAULT '0',
`state` INTEGER DEFAULT '0'
) ;
]]
function logins.createdb(presets,datatable)
local db = checkeddb(presets,datatable)
local data, keys = db.execute {
template = db.usedmethod == "sqlite" and sqlite_template or template,
variables = {
basename = db.basename,
},
}
report_logins("datatable %a created in %a",db.name,db.base)
return db
end
local template =[[
DROP TABLE IF EXISTS %basename% ;
]]
function logins.deletedb(presets,datatable)
local db = checkeddb(presets,datatable)
local data, keys = db.execute {
template = template,
variables = {
basename = db.basename,
},
}
report_logins("datatable %a removed in %a",db.name,db.base)
end
local states = {
[0] = "unset",
[1] = "known",
[2] = "unknown",
}
local converter_fetch, fields_fetch = sqlmakeconverter {
{ name = "id", type = "number" },
{ name = "name", type = "string" },
{ name = "time", type = "number" },
{ name = "n", type = "number" },
{ name = "state", type = "number" }, -- faster than mapping
}
local template_fetch = format( [[
SELECT
%s
FROM
`logins`
WHERE
`name` = '%%[name]%%'
]], fields_fetch )
local template_insert = [[
INSERT INTO `logins`
( `name`, `state`, `time`, `n`)
VALUES
('%[name]%', %state%, %time%, %n%)
]]
local template_update = [[
UPDATE
`logins`
SET
`state` = %state%,
`time` = %time%,
`n` = %n%
WHERE
`name` = '%[name]%'
]]
local template_delete = [[
DELETE FROM
`logins`
WHERE
`name` = '%[name]%'
]]
local template_purge = [[
DELETE FROM
`logins`
WHERE
`time` < '%time%'
]]
-- todo: auto cleanup (when new attempt)
local cache = { } setmetatable(cache, { __mode = 'v' })
-- local function usercreate(presets)
-- sqlexecute {
-- template = template_create,
-- presets = presets,
-- }
-- end
function logins.userunknown(db,name)
local d = {
name = name,
state = 2,
time = ostime(),
n = 0,
}
db.execute {
template = template_update,
variables = d,
}
cache[name] = d
report_logins("user %a is registered as unknown",name)
end
function logins.userknown(db,name)
local d = {
name = name,
state = 1,
time = ostime(),
n = 0,
}
db.execute {
template = template_update,
variables = d,
}
cache[name] = d
report_logins("user %a is registered as known",name)
end
function logins.userreset(db,name)
db.execute {
template = template_delete,
}
cache[name] = nil
report_logins("user %a is reset",name)
end
local function userpurge(db,delay)
db.execute {
template = template_purge,
variables = {
time = ostime() - (delay or logins.purgetime),
}
}
cache = { }
report_logins("users are purged")
end
logins.userpurge = userpurge
local function verdict(okay,...)
if not trace_logins then
-- no tracing
elseif okay then
report_logins("%s, granted",formatter(...))
else
report_logins("%s, blocked",formatter(...))
end
return okay
end
local lasttime = 0
function logins.userpermitted(db,name)
local currenttime = ostime()
if logins.autopurge and (lasttime == 0 or (currenttime - lasttime > logins.purgetime)) then
report_logins("automatic purge triggered")
userpurge(db)
lasttime = currenttime
end
local data = cache[name]
if data then
report_logins("user %a is cached",name)
else
report_logins("user %a is fetched",name)
data = db.execute {
template = template_fetch,
converter = converter_fetch,
variables = {
name = name,
}
}
end
if not data or not data.name then
local d = {
name = name,
state = 0,
time = currenttime,
n = 1,
}
db.execute {
template = template_insert,
variables = d,
}
cache[name] = d
return verdict(true,"creating new entry for %a",name)
end
cache[name] = data[1]
local state = data.state
if state == 2 then -- unknown
return verdict(false,"user %a has state %a",name,states[state])
end
local n = data.n
local m = logins.maxnoflogins
if n > m then
local deltatime = currenttime - data.time
local cooldowntime = logins.cooldowntime
if deltatime < cooldowntime then
return verdict(false,"user %a is blocked for %s seconds out of %s",name,cooldowntime-deltatime,cooldowntime)
else
n = 0
end
end
if n == 0 then
local d = {
name = name,
state = 0,
time = currenttime,
n = 1,
}
db.execute {
template = template_update,
variables = d,
}
cache[name] = d
return verdict(true,"user %a gets a first chance",name)
else
local d = {
name = name,
state = 0,
time = currenttime,
n = n + 1,
}
db.execute {
template = template_update,
variables = d,
}
cache[name] = d
return verdict(true,"user %a gets a new chance, %s attempts out of %s done",name,n,m)
end
end
return logins
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