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-- Gemeinschaft 5 module: group class
-- (c) AMOOMA GmbH 2013
--
module(...,package.seeall)
Group = {}
MAX_GROUP_MEMBERSHIPS = 256;
-- create group object
function Group.new(self, arg)
arg = arg or {}
object = arg.object or {}
setmetatable(object, self);
self.__index = self;
self.class = 'group';
self.log = arg.log;
self.database = arg.database;
return object;
end
-- find group by id
function Group.find_by_id(self, id)
local sql_query = 'SELECT * FROM `groups` WHERE `id`= ' .. tonumber(id) .. ' LIMIT 1';
local group = nil;
self.database:query(sql_query, function(account_entry)
group = Group:new(self);
group.record = account_entry;
group.id = tonumber(account_entry.id);
group.name = account_entry.name;
end);
return group;
end
-- list groups by member permissions
function Group.name_id_by_permission(self, member_id, member_type, permission)
if not tonumber(member_id) then
return {};
end
local sql_query = 'SELECT DISTINCT `c`.`id`, `c`.`name` \
FROM `group_permissions` `a` \
JOIN `group_memberships` `b` ON `a`.`target_group_id` = `b`.`group_id` \
JOIN `groups` `c` ON `c`.`id` = `b`.`group_id` \
WHERE `b`.`item_type` = ' .. self.database:escape(member_type, '"') .. ' \
AND `b`.`item_id` = ' .. member_id .. ' \
AND `a`.`permission` = ' .. self.database:escape(permission, '"') .. ' \
AND `c`.`active` IS TRUE \
GROUP BY `b`.`group_id` LIMIT ' .. MAX_GROUP_MEMBERSHIPS;
local group_names = {};
local group_ids = {};
self.database:query(sql_query, function(account_entry)
table.insert(group_names, account_entry.name);
table.insert(group_ids, tonumber(account_entry.id));
end);
return group_names, group_ids;
end
-- list groups by member
function Group.name_id_by_member(self, member_id, member_type)
if not tonumber(member_id) then
return {};
end
local sql_query = 'SELECT DISTINCT `c`.`id`, `c`.`name` \
FROM `group_memberships` `b` \
JOIN `groups` `c` ON `c`.`id` = `b`.`group_id` \
WHERE `b`.`item_type` = ' .. self.database:escape(member_type, '"') .. ' \
AND `b`.`item_id` = ' .. member_id .. ' \
AND `c`.`active` IS TRUE \
GROUP BY `b`.`group_id` LIMIT ' .. MAX_GROUP_MEMBERSHIPS;
local group_names = {};
local group_ids = {};
self.database:query(sql_query, function(account_entry)
table.insert(group_names, account_entry.name);
table.insert(group_ids, tonumber(account_entry.id));
end);
return group_names, group_ids;
end
function Group.permission_targets(self, group_ids, permission)
if not group_ids or not permission then
return {};
end
local sql_query = 'SELECT DISTINCT `b`.`id`, `b`.`name` \
FROM `group_permissions` `a` \
JOIN `groups` `b` ON `b`.`id` = `a`.`target_group_id` \
WHERE `a`.`permission` = ' .. self.database:escape(permission, '"') .. ' \
AND `a`.`group_id` IN (' .. table.concat(group_ids, ',') .. ') \
AND `b`.`active` IS TRUE \
GROUP BY `a`.`target_group_id` LIMIT ' .. MAX_GROUP_MEMBERSHIPS;
local group_names = {};
local group_ids = {};
self.database:query(sql_query, function(account_entry)
table.insert(group_names, account_entry.name);
table.insert(group_ids, tonumber(account_entry.id));
end);
return group_names, group_ids;
end
function Group.is_target(self, group_id, permission)
if not group_id or not permission then
return nil;
end
local sql_query = 'SELECT `b`.`name` \
FROM `group_permissions` `a` \
JOIN `groups` `b` ON `b`.`id` = `a`.`target_group_id` \
WHERE `a`.`permission` = ' .. self.database:escape(permission, '"') .. ' \
AND `a`.`group_id` = ' .. tonumber(group_id) .. ' \
AND `b`.`active` IS TRUE \
LIMIT 1';
return self.database:query_return_value(sql_query);
end
function Group.union(self, ...)
local groups = {};
local group_sets = {...};
for set_index=1, #group_sets do
if type(group_sets[set_index]) == 'table' then
local group_ids = group_sets[set_index];
for index=1, #group_ids do
groups[tonumber(group_ids[index])] = true;
end
end
end
local group_ids = {};
for group_id, status in pairs(groups) do
table.insert(group_ids, group_id);
end
return group_ids;
end
function Group.intersection(self, set_one, set_two)
local basic_set = {};
for index=1, #set_one do
basic_set[set_one[index]] = true;
end
local final_set = {};
for index=1, #set_two do
if basic_set[set_two[index]] then
table.insert(final_set, set_two[index]);
end
end
return final_set;
end
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