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--[[
Copyright (c) 2019, Vsevolod Stakhov <vsevolod@highsecure.ru>
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 l = require 'lpeg'
local rspamd_text = require "rspamd_text"
local wsp = l.P" "
local crlf = l.P"\r"^-1 * l.P"\n"
local eol = (crlf * #crlf) + (crlf - (crlf^-1 * wsp))
local name = l.C((l.P(1) - (l.P":"))^1) / function(v) return (v:gsub("[\n\r]+%s","")) end
local value = l.C((l.P(1) - eol)^0) / function(v) return (v:gsub("[\n\r]+%s","")) end
local elt = name * ":" * wsp^0 * value * eol
local exports = {}
local function process_ical(input, _, _)
local control={n='\n', r='\r'}
local escaper = l.Ct((elt / function(_,b) return (b:gsub("\\(.)", control)) end)^1)
local values = escaper:match(input)
if not values then
return nil
end
return rspamd_text.fromtable(values, "\n")
end
--[[[
-- @function lua_ical.process(input)
-- Returns all values from ical as a plain text. Names are completely ignored.
--]]
exports.process = process_ical
return exports
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