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* Restructure mod directoryorwell962017-01-04
ref='#n34'>34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148
-- advtrains
-- protection.lua: privileges and rail protection, and some helpers


-- Privileges to control TRAIN DRIVING/COUPLING
minetest.register_privilege("train_operator", {
	description = "Without this privilege, a player can't do anything about trains, neither place or remove them nor drive or couple them (but he can build tracks if he has track_builder)",
	give_to_singleplayer= true,
});

minetest.register_privilege("train_admin", {
	description = "Player may drive, place or remove any trains from/to anywhere, regardless of owner, whitelist or protection",
	give_to_singleplayer= true,
});

-- Privileges to control TRACK BUILDING
minetest.register_privilege("track_builder", {
	description = "Player can place and/or dig rails not protected from him. If he also has protection_bypass, he can place/dig any rails",
	give_to_singleplayer= true,
});

-- Privileges to control OPERATING TURNOUTS/SIGNALS
minetest.register_privilege("railway_operator", {
	description = "Player can operate turnouts and signals not protected from him. If he also has protection_bypass, he can operate any turnouts/signals",
	give_to_singleplayer= true,
});

-- there is a configuration option "allow_build_only_owner". If this is active, a player having track_builder can only build rails and operate signals/turnouts in an area explicitly belonging to him
-- (checked using a dummy player called "*dummy*" (which is not an allowed player name))

--[[
Protection/privilege concept:
Tracks:
	Protected 1 node all around a rail and 4 nodes upward (maybe make this dynamically determined by the rail...)
	if track_builder privilege:
		if not protected from* player:
			if allow_build_only_owner:
				if unprotected:
					deny
			else:
				allow
	deny
Wagons in general:
	Players can only place/destroy wagons if they have train_operator
Wagon driving controls:
	The former seat_access tables are unnecessary, instead there is a whitelist for the driving stands
	on player trying to access a driver stand:
	if is owner or is on whitelist:
		allow
	else:
		deny
Wagon coupling:
	Derived from the privileges for driving stands. The whitelist is shared (and also settable on non-driverstand wagons)
	for each of the two bordering wagons:
		if is owner or is on whitelist:
			allow

*"protected from" means the player is not allowed to do things, while "protected by" means that the player is (one of) the owner(s) of this area

]]--

local boo = minetest.settings:get_bool("advtrains_allow_build_to_owner")


local nocheck
-- Check if the node we are about to check is in the range of a track that is protected from a player
--WARN: true means here that the action is forbidden!
function advtrains.check_track_protection(pos, pname)
	if nocheck or pname=="" then
		return false
	end
	nocheck=true --prevent recursive calls, never check this again if we're already in
	local r, vr = 1, 3
	local nodes = minetest.find_nodes_in_area(
		{x = pos.x - r, y = pos.y - vr, z = pos.z - r},
		{x = pos.x + r, y = pos.y, z = pos.z + r},
		{"group:advtrains_track"})
	for _,npos in ipairs(nodes) do
		if not minetest.check_player_privs(pname, {track_builder = true}) then
			if boo and not minetest.is_protected(npos, pname) and minetest.is_protected(npos, "*dummy*") then
				nocheck = false
				return false
			else
				minetest.chat_send_player(pname, "You are not allowed to dig or place nodes near tracks (missing track_builder privilege)")
				minetest.log("action", pname.." tried to dig/place nodes near the track at "..minetest.pos_to_string(npos).." but does not have track_builder")
				nocheck = false
				return true
			end
		end
		if not minetest.check_player_privs(pname, {protection_bypass = true}) then
			if minetest.is_protected(npos, pname) then
				nocheck = false
				minetest.record_protection_violation(pos, pname)
				return true
			end
		end
	end
	nocheck=false
	return false
end

local old_is_protected = minetest.is_protected
minetest.is_protected = function(pos, pname)
	if advtrains.check_track_protection(pos, pname) then
		return true
	end
	return old_is_protected(pos, pname)
end

--WARN: true means here that the action is allowed!
function advtrains.check_driving_couple_protection(pname, owner, whitelist)