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local S = areas.S
function areas:player_exists(name)
return minetest.get_auth_handler().get_auth(name) ~= nil
end
-- Save the areas table to a file
function areas:save()
local datastr = minetest.write_json(self.areas, true)
if not datastr then
minetest.log("error", "[areas] Failed to serialize area data!")
return
end
return minetest.safe_file_write(self.config.filename, datastr)
end
-- Load the areas table from the save file
function areas:load()
local file, err = io.open(self.config.filename, "r")
if err then
self.areas = self.areas or {}
return err
end
local data = file:read("*a")
if data:sub(1, 1) == "[" then
self.areas, err = minetest.parse_json(data)
else
self.areas, err = minetest.deserialize(data)
end
if type(self.areas) ~= "table" then
self.areas = {}
end
if err and #data > 10 then
minetest.log("error", "[areas] Failed to load area data: " ..
tostring(err))
end
file:close()
self:populateStore()
end
--- Checks an AreaStore ID.
-- Deletes the AreaStore (falling back to the iterative method)
-- and prints an error message if the ID is invalid.
-- @return Whether the ID was valid.
function areas:checkAreaStoreId(sid)
if not sid then
minetest.log("error", "AreaStore failed to find an ID for an "
.. "area! Falling back to iterative area checking.")
self.store = nil
self.store_ids = nil
end
return sid and true or false
end
-- Populates the AreaStore after loading, if needed.
function areas:populateStore()
if not rawget(_G, "AreaStore") then
return
end
local store = AreaStore()
local store_ids = {}
for id, area in pairs(areas.areas) do
local sid = store:insert_area(area.pos1,
area.pos2, tostring(id))
if not self:checkAreaStoreId(sid) then
return
end
store_ids[id] = sid
end
self.store = store
self.store_ids = store_ids
end
-- Finds the first usable index in a table
-- Eg: {[1]=false,[4]=true} -> 2
local function findFirstUnusedIndex(t)
local i = 0
repeat i = i + 1
until t[i] == nil
return i
end
--- Add a area.
-- @return The new area's ID.
function areas:add(owner, name, pos1, pos2, parent)
local id = findFirstUnusedIndex(self.areas)
self.areas[id] = {
name = name,
pos1 = pos1,
pos2 = pos2,
owner = owner,
parent = parent,
canPvP = nil
}
for i=1, #areas.registered_on_adds do
areas.registered_on_adds[i](id, self.areas[id])
end
-- Add to AreaStore
if self.store then
local sid = self.store:insert_area(pos1, pos2, tostring(id))
if self:checkAreaStoreId(sid) then
self.store_ids[id] = sid
end
end
return id
end
--- Remove a area, and optionally it's children recursively.
-- If a area is deleted non-recursively the children will
-- have the removed area's parent as their new parent.
function areas:remove(id, recurse)
if recurse then
-- Recursively find child entries and remove them
local cids = self:getChildren(id)
for _, cid in pairs(cids) do
self:remove(cid, true)
end
else
-- Update parents
local parent = self.areas[id].parent
local children = self:getChildren(id)
for _, cid in pairs(children) do
-- The subarea parent will be niled out if the
-- removed area does not have a parent
self.areas[cid].parent = parent
end
end
for i=1, #areas.registered_on_removes do
areas.registered_on_removes[i](id)
end
-- Remove main entry
self.areas[id] = nil
-- Remove from AreaStore
if self.store then
self.store:remove_area(self.store_ids[id])
self.store_ids[id] = nil
end
end
--- Move an area.
function areas:move(id, area, pos1, pos2)
area.pos1 = pos1
area.pos2 = pos2
for i=1, #areas.registered_on_moves do
areas.registered_on_moves[i](id, area, pos1, pos2)
end
if self.store then
self.store:remove_area(areas.store_ids[id])
local sid = self.store:insert_area(pos1, pos2, tostring(id))
if self:checkAreaStoreId(sid) then
self.store_ids[id] = sid
end
end
end
-- Check if PvP is enabled in an area
-- @returns true or false (enabled or disabled)
function areas:canPvP(id)
local area = self.areas[id]
if not area then
return true
end
-- canPvP is nil when false
return area.canPvP or false
end
-- Checks if a area between two points is entirely contained by another area.
-- Positions must be sorted.
function areas:isSubarea(pos1, pos2, id)
local area = self.areas[id]
if not area then
return false
end
local ap1, ap2 = area.pos1, area.pos2
local ap1x, ap1y, ap1z = ap1.x, ap1.y, ap1.z
local ap2x, ap2y, ap2z = ap2.x, ap2.y, ap2.z
local p1x, p1y, p1z = pos1.x, pos1.y, pos1.z
local p2x, p2y, p2z = pos2.x, pos2.y, pos2.z
if
(p1x >= ap1x and p1x <= ap2x) and
(p2x >= ap1x and p2x <= ap2x) and
(p1y >= ap1y and p1y <= ap2y) and
(p2y >= ap1y and p2y <= ap2y) and
(p1z >= ap1z and p1z <= ap2z) and
(p2z >= ap1z and p2z <= ap2z) then
return true
end
end
-- Returns a table (list) of children of an area given it's identifier
function areas:getChildren(id)
local children = {}
for cid, area in pairs(self.areas) do
if area.parent and area.parent == id then
table.insert(children, cid)
end
end
return children
end
-- Checks if the user has sufficient privileges.
-- If the player is not a administrator it also checks
-- if the area intersects other areas that they do not own.
-- Also checks the size of the area and if the user already
-- has more than max_areas.
function areas:canPlayerAddArea(pos1, pos2, name)
local privs = minetest.get_player_privs(name)
if privs.areas then
return true
end
-- Check self protection privilege, if it is enabled,
-- and if the area is too big.
if not self.config.self_protection or
not privs[areas.config.self_protection_privilege] then
return false, S("Self protection is disabled or you do not have"
.." the necessary privilege.")
end
local max_size = privs.areas_high_limit and
self.config.self_protection_max_size_high or
self.config.self_protection_max_size
if
(pos2.x - pos1.x) > max_size.x or
(pos2.y - pos1.y) > max_size.y or
(pos2.z - pos1.z) > max_size.z then
return false, S("Area is too big.")
end
-- Check number of areas the user has and make sure it not above the max
local count = 0
for _, area in pairs(self.areas) do
if area.owner == name then
count = count + 1
end
end
local max_areas = privs.areas_high_limit and
self.config.self_protection_max_areas_high or
self.config.self_protection_max_areas
if count >= max_areas then
return false, S("You have reached the maximum amount of"
.." areas that you are allowed to protect.")
end
-- Check intersecting areas
local can, id = self:canInteractInArea(pos1, pos2, name)
if not can then
local area = self.areas[id]
return false, S("The area intersects with @1 [@2] (@3).",
area.name, id, area.owner)
end
return true
end
-- Given a id returns a string in the format:
-- "name [id]: owner (x1, y1, z1) (x2, y2, z2) -> children"
function areas:toString(id)
local area = self.areas[id]
local message = ("%s [%d]: %s %s %s"):format(
area.name, id, area.owner,
minetest.pos_to_string(area.pos1),
minetest.pos_to_string(area.pos2))
local children = areas:getChildren(id)
if #children > 0 then
message = message.." -> "..table.concat(children, ", ")
end
return message
end
-- Re-order areas in table by their identifiers
function areas:sort()
local sa = {}
for k, area in pairs(self.areas) do
if not area.parent then
table.insert(sa, area)
local newid = #sa
for _, subarea in pairs(self.areas) do
if subarea.parent == k then
subarea.parent = newid
table.insert(sa, subarea)
end
end
end
end
self.areas = sa
end
-- Checks if a player owns an area or a parent of it
function areas:isAreaOwner(id, name)
local cur = self.areas[id]
if cur and minetest.check_player_privs(name, self.adminPrivs) then
return true
end
while cur do
if cur.owner == name then
return true
elseif cur.parent then
cur = self.areas[cur.parent]
else
return false
end
end
return false
end