93 lines
2.3 KiB
Lua
93 lines
2.3 KiB
Lua
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--[[
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FormSpec Context ('fsc') mod for minetest
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Copyright (C) 2018 Auke Kok <sofar@foo-projects.org>
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Permission to use, copy, modify, and/or distribute this software for
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any purpose with or without fee is hereby granted, provided that the
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above copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY
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SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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]]--
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fsc = {}
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local _data = {}
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local SRNG = SecureRandom()
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assert(SRNG)
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local function make_new_random_id()
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local s = SRNG:next_bytes(16)
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return s:gsub(".", function(c) return string.format("%02x", string.byte(c)) end)
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end
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function fsc.show(name, formspec, context, callback)
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assert(name)
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assert(formspec)
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assert(callback)
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if not context then
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context = {}
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end
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-- erase old context!
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local id = "fsc:" .. make_new_random_id()
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_data[name] = {
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id = id,
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name = name,
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context = context,
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callback = callback,
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}
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minetest.show_formspec(name, id, formspec)
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end
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minetest.register_on_player_receive_fields(function(player, formname, fields)
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if not formname:match("fsc:") then
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return false
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end
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local name = player:get_player_name()
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local data = _data[name]
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if not data then
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minetest.log("warning", "fsc: no data for formspec sent by " .. name)
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minetest.close_formspec(name, formname)
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return
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end
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if data.id ~= formname then
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minetest.log("warning", "fsc: invalid id for formspec sent by " .. name)
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minetest.close_formspec(name, formname)
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_data[name] = nil
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return
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end
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if data.name ~= name then
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minetest.log("error", "fsc: possible hash collision or exploit (name mismatch)")
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minetest.close_formspec(name, formname)
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_data[name] = nil
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return
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end
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if data then
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if data.callback(player, fields, data.context) then
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minetest.close_formspec(name, formname)
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_data[name] = nil
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elseif fields.quit then
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_data[name] = nil
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end
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end
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end)
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minetest.register_on_leaveplayer(function(player)
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_data[player:get_player_name()] = nil
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end)
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