mirror of
https://github.com/processone/ejabberd.git
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239 lines
7.6 KiB
Erlang
239 lines
7.6 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : nodetree_dag.erl
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%%% Author : Brian Cully <bjc@kublai.com>
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%%% Purpose : experimental support of XEP-248
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%%% Created : 15 Jun 2009 by Brian Cully <bjc@kublai.com>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2017 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%----------------------------------------------------------------------
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-module(nodetree_dag).
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-behaviour(gen_pubsub_nodetree).
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-author('bjc@kublai.com').
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-include_lib("stdlib/include/qlc.hrl").
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-include("pubsub.hrl").
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-include("xmpp.hrl").
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-export([init/3, terminate/2, options/0, set_node/1,
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get_node/3, get_node/2, get_node/1, get_nodes/2,
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get_nodes/1, get_parentnodes/3, get_parentnodes_tree/3,
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get_subnodes/3, get_subnodes_tree/3, create_node/6,
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delete_node/2]).
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-define(DEFAULT_NODETYPE, leaf).
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-define(DEFAULT_PARENTS, []).
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-define(DEFAULT_CHILDREN, []).
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init(Host, ServerHost, Opts) ->
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nodetree_tree:init(Host, ServerHost, Opts).
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terminate(Host, ServerHost) ->
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nodetree_tree:terminate(Host, ServerHost).
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set_node(#pubsub_node{nodeid = {Key, _}, owners = Owners, options = Options} = Node) ->
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Parents = find_opt(collection, ?DEFAULT_PARENTS, Options),
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case validate_parentage(Key, Owners, Parents) of
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true -> mnesia:write(Node#pubsub_node{parents = Parents});
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Other -> Other
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end.
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create_node(Key, Node, Type, Owner, Options, Parents) ->
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OwnerJID = jid:tolower(jid:remove_resource(Owner)),
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case find_node(Key, Node) of
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false ->
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Nidx = pubsub_index:new(node),
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N = #pubsub_node{nodeid = oid(Key, Node), id = Nidx,
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type = Type, parents = Parents, owners = [OwnerJID],
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options = Options},
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case set_node(N) of
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ok -> {ok, Nidx};
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Other -> Other
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end;
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_ ->
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{error, xmpp:err_conflict(<<"Node already exists">>, ?MYLANG)}
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end.
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delete_node(Key, Node) ->
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case find_node(Key, Node) of
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false ->
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{error, xmpp:err_item_not_found(<<"Node not found">>, ?MYLANG)};
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Record ->
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lists:foreach(fun (#pubsub_node{options = Opts} = Child) ->
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NewOpts = remove_config_parent(Node, Opts),
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Parents = find_opt(collection, ?DEFAULT_PARENTS, NewOpts),
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ok = mnesia:write(pubsub_node,
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Child#pubsub_node{parents = Parents,
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options = NewOpts},
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write)
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end,
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get_subnodes(Key, Node)),
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pubsub_index:free(node, Record#pubsub_node.id),
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mnesia:delete_object(pubsub_node, Record, write),
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[Record]
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end.
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options() ->
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nodetree_tree:options().
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get_node(Host, Node, _From) ->
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get_node(Host, Node).
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get_node(Host, Node) ->
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case find_node(Host, Node) of
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false -> {error, xmpp:err_item_not_found(<<"Node not found">>, ?MYLANG)};
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Record -> Record
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end.
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get_node(Node) ->
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nodetree_tree:get_node(Node).
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get_nodes(Key, From) ->
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nodetree_tree:get_nodes(Key, From).
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get_nodes(Key) ->
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nodetree_tree:get_nodes(Key).
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get_parentnodes(Host, Node, _From) ->
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case find_node(Host, Node) of
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false ->
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{error, xmpp:err_item_not_found(<<"Node not found">>, ?MYLANG)};
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#pubsub_node{parents = Parents} ->
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Q = qlc:q([N
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|| #pubsub_node{nodeid = {NHost, NNode}} = N
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<- mnesia:table(pubsub_node),
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Parent <- Parents, Host == NHost, Parent == NNode]),
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qlc:e(Q)
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end.
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get_parentnodes_tree(Host, Node, _From) ->
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Pred = fun (NID, #pubsub_node{nodeid = {_, NNode}}) ->
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NID == NNode
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end,
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Tr = fun (#pubsub_node{parents = Parents}) -> Parents
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end,
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traversal_helper(Pred, Tr, Host, [Node]).
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get_subnodes(Host, Node, _From) ->
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get_subnodes(Host, Node).
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get_subnodes(Host, <<>>) ->
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get_subnodes_helper(Host, <<>>);
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get_subnodes(Host, Node) ->
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case find_node(Host, Node) of
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false -> {error, xmpp:err_item_not_found(<<"Node not found">>, ?MYLANG)};
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_ -> get_subnodes_helper(Host, Node)
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end.
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get_subnodes_helper(Host, Node) ->
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Q = qlc:q([N
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|| #pubsub_node{nodeid = {NHost, _},
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parents = Parents} =
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N
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<- mnesia:table(pubsub_node),
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Host == NHost, lists:member(Node, Parents)]),
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qlc:e(Q).
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get_subnodes_tree(Host, Node, From) ->
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Pred = fun (NID, #pubsub_node{parents = Parents}) ->
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lists:member(NID, Parents)
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end,
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Tr = fun (#pubsub_node{nodeid = {_, N}}) -> [N] end,
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traversal_helper(Pred, Tr, 1, Host, [Node],
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[{0, [get_node(Host, Node, From)]}]).
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%%====================================================================
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%% Internal functions
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%%====================================================================
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oid(Key, Name) -> {Key, Name}.
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%% Key = jlib:jid() | host()
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%% Node = string()
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-spec find_node(Key :: mod_pubsub:hostPubsub(), Node :: mod_pubsub:nodeId()) ->
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mod_pubsub:pubsubNode() | false.
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find_node(Key, Node) ->
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case mnesia:read(pubsub_node, oid(Key, Node), read) of
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[] -> false;
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[Node] -> Node
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end.
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%% Key = jlib:jid() | host()
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%% Default = term()
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%% Options = [{Key = atom(), Value = term()}]
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find_opt(Key, Default, Options) ->
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case lists:keysearch(Key, 1, Options) of
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{value, {Key, Val}} -> Val;
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_ -> Default
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end.
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-spec traversal_helper(Pred :: fun(), Tr :: fun(), Host :: mod_pubsub:hostPubsub(),
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Nodes :: [mod_pubsub:nodeId(),...]) ->
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[{Depth::non_neg_integer(),
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Nodes::[mod_pubsub:pubsubNode(),...]}].
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traversal_helper(Pred, Tr, Host, Nodes) ->
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traversal_helper(Pred, Tr, 0, Host, Nodes, []).
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traversal_helper(_Pred, _Tr, _Depth, _Host, [], Acc) ->
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Acc;
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traversal_helper(Pred, Tr, Depth, Host, Nodes, Acc) ->
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Q = qlc:q([N
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|| #pubsub_node{nodeid = {NHost, _}} = N
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<- mnesia:table(pubsub_node),
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Node <- Nodes, Host == NHost, Pred(Node, N)]),
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Nodes = qlc:e(Q),
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IDs = lists:flatmap(Tr, Nodes),
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traversal_helper(Pred, Tr, Depth + 1, Host, IDs, [{Depth, Nodes} | Acc]).
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remove_config_parent(Node, Options) ->
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remove_config_parent(Node, Options, []).
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remove_config_parent(_Node, [], Acc) ->
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lists:reverse(Acc);
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remove_config_parent(Node, [{collection, Parents} | T], Acc) ->
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remove_config_parent(Node, T, [{collection, lists:delete(Node, Parents)} | Acc]);
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remove_config_parent(Node, [H | T], Acc) ->
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remove_config_parent(Node, T, [H | Acc]).
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-spec validate_parentage(Key :: mod_pubsub:hostPubsub(), Owners :: [ljid(),...],
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Parent_Nodes :: [mod_pubsub:nodeId()]) ->
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true | {error, xmlel()}.
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validate_parentage(_Key, _Owners, []) ->
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true;
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validate_parentage(Key, Owners, [[] | T]) ->
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validate_parentage(Key, Owners, T);
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validate_parentage(Key, Owners, [<<>> | T]) ->
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validate_parentage(Key, Owners, T);
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validate_parentage(Key, Owners, [ParentID | T]) ->
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case find_node(Key, ParentID) of
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false ->
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{error, xmpp:err_item_not_found(<<"Node not found">>, ?MYLANG)};
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#pubsub_node{owners = POwners, options = POptions} ->
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NodeType = find_opt(node_type, ?DEFAULT_NODETYPE, POptions),
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MutualOwners = [O || O <- Owners, PO <- POwners, O == PO],
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case {MutualOwners, NodeType} of
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{[], _} -> {error, xmpp:err_forbidden()};
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{_, collection} -> validate_parentage(Key, Owners, T);
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{_, _} -> {error, xmpp:err_not_allowed()}
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end
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end.
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