--[[ Copyright (c) 2022, Vsevolod Stakhov Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. ]]-- local rspamd_regexp = require "rspamd_regexp" local util = require "rspamd_util" -- Uncategorized rules local subject_re = rspamd_regexp.create('/^(?:(?:Re|Fwd|Fw|Aw|Antwort|Sv):\\s*)+(.+)$/i') local function test_subject(task, check_function, rate) local function normalize_linear(a, x) local f = a * x return true, (( f < 1 ) and f or 1), tostring(x) end local sbj = task:get_header('Subject') if sbj then local stripped_subject = subject_re:search(sbj, false, true) if stripped_subject and stripped_subject[1] and stripped_subject[1][2] then sbj = stripped_subject[1][2] end local l = util.strlen_utf8(sbj) if check_function(sbj, l) then return normalize_linear(rate, l) end end return false end rspamd_config.SUBJ_ALL_CAPS = { callback = function(task) local caps_test = function(sbj) return util.is_uppercase(sbj) end return test_subject(task, caps_test, 1.0/40.0) end, score = 3.0, group = 'subject', type = 'mime', description = 'Subject contains mostly capital letters' } rspamd_config.LONG_SUBJ = { callback = function(task) local length_test = function(_, len) return len > 200 end return test_subject(task, length_test, 1.0/400.0) end, score = 3.0, group = 'subject', type = 'mime', description = 'Subject is very long' }