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--[[
Copyright (c) 2015, Vsevolod Stakhov <vsevolod@highsecure.ru>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
]]--
-- This plugin is a concept of FANN scores adjustment
-- NOT FOR PRODUCTION USE so far
local rspamd_logger = require "rspamd_logger"
local rspamd_fann = require "rspamd_fann"
local rspamd_util = require "rspamd_util"
local fann_symbol = 'FANN_SCORE'
local ucl = require "ucl"
-- Module vars
local fann
local symbols
local nsymbols = 0
local opts = rspamd_config:get_all_opt("fann_scores")
local function fann_scores_filter(task)
local fann_input = {}
for sym,idx in pairs(symbols) do
if task:get_symbol(sym) then
fann_input[idx + 1] = 1
else
fann_input[idx + 1] = 0
end
end
local out = fann:test(nsymbols, fann_input)
local result = rspamd_util.tanh(2 * (out[1] - 0.5))
local symscore = string.format('%.3f', out[1])
rspamd_logger.infox(task, 'fann score: %s', symscore)
task:insert_result(fann_symbol, result, symscore)
end
if not rspamd_fann.is_enabled() then
rspamd_logger.errx(rspamd_config, 'fann is not compiled in rspamd, this ' ..
'module is eventually disabled')
else
if not opts['fann_file'] or not opts['symbols_file'] then
rspamd_logger.errx(rspamd_config, 'fann_scores module requires ' ..
'`fann_file` and `symbols_file` to be specified')
else
fann = rspamd_fann.load(opts['fann_file'])
if not fann then
rspamd_logger.errx(rspamd_config, 'cannot load fann from %s',
opts['fann_file'])
return
end
-- Parse symbols
local parser = ucl.parser()
local res, err = parser:parse_file(opts['symbols_file'])
if not res then
rspamd_logger.errx(rspamd_config, 'cannot load symbols from %s: %s',
opts['symbols_file'], err)
return
end
symbols = parser:get_object()
-- Check sanity
for _,s in pairs(symbols) do nsymbols = nsymbols + 1 end
if fann:get_inputs() ~= nsymbols then
rspamd_logger.errx(rspamd_config, 'fann number of inputs: %s is not equal' ..
' to symbols count: %s',
fann:get_inputs(), nsymbols)
return
end
if fann:get_outputs() ~= 1 then
rspamd_logger.errx(rspamd_config, 'fann nuber of outputs is invalid: %s',
fann:get_outputs())
return
end
rspamd_config:set_metric_symbol(fann_symbol, 3.0, 'Experimental FANN adjustment')
rspamd_config:register_post_filter(fann_scores_filter)
end
end
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