%%%----------------------------------------------------------------------
%%% File : node_flat.erl
%%% Author : Christophe Romain <christophe.romain@process-one.net>
%%% Purpose : Standard PubSub node plugin
%%% Created : 1 Dec 2007 by Christophe Romain <christophe.romain@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2022 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
%%% @doc The module <strong>{@module}</strong> is the default PubSub plugin.
%%% <p>It is used as a default for all unknown PubSub node type. It can serve
%%% as a developer basis and reference to build its own custom pubsub node
%%% types.</p>
%%% <p>PubSub plugin nodes are using the {@link gen_node} behaviour.</p>
-module(node_flat).
-behaviour(gen_pubsub_node).
-author('christophe.romain@process-one.net').
-include("pubsub.hrl").
-include_lib("xmpp/include/xmpp.hrl").
-export([init/3, terminate/2, options/0, features/0,
create_node_permission/6, create_node/2, delete_node/1,
purge_node/2, subscribe_node/8, unsubscribe_node/4,
publish_item/7, delete_item/4,
remove_extra_items/2, remove_extra_items/3, remove_expired_items/2,
get_entity_affiliations/2, get_node_affiliations/1,
get_affiliation/2, set_affiliation/3,
get_entity_subscriptions/2, get_node_subscriptions/1,
get_subscriptions/2, set_subscriptions/4,
get_pending_nodes/2, get_states/1, get_state/2,
set_state/1, get_items/7, get_items/3, get_item/7,
get_last_items/3, get_only_item/2,
get_item/2, set_item/1, get_item_name/3, node_to_path/1,
path_to_node/1, can_fetch_item/2, is_subscribed/1, transform/1]).
init(_Host, _ServerHost, _Opts) ->
%pubsub_subscription:init(Host, ServerHost, Opts),
ejabberd_mnesia:create(?MODULE, pubsub_state,
[{disc_copies, [node()]}, {index, [nodeidx]},
{type, ordered_set},
{attributes, record_info(fields, pubsub_state)}]),
ejabberd_mnesia:create(?MODULE, pubsub_item,
[{disc_only_copies, [node()]}, {index, [nodeidx]},
{attributes, record_info(fields, pubsub_item)}]),
ejabberd_mnesia:create(?MODULE, pubsub_orphan,
[{disc_copies, [node()]},
{attributes, record_info(fields, pubsub_orphan)}]),
ItemsFields = record_info(fields, pubsub_item),
case mnesia:table_info(pubsub_item, attributes) of
ItemsFields -> ok;
_ -> mnesia:transform_table(pubsub_item, ignore, ItemsFields)
end,
ok.
terminate(_Host, _ServerHost) ->
ok.
options() ->
[{deliver_payloads, true},
{notify_config, false},
{notify_delete, false},
{notify_retract, true},
{purge_offline, false},
{persist_items, true},
{max_items, ?MAXITEMS},
{subscribe, true},
{access_model, open},
{roster_groups_allowed, []},
{publish_model, publishers},
{notification_type, headline},
{max_payload_size, ?MAX_PAYLOAD_SIZE},
{send_last_published_item, on_sub_and_presence},
{deliver_notifications, true},
{presence_based_delivery, false},
{itemreply, none}].
features() ->
[<<"create-nodes">>,
<<"auto-create">>,
<<"access-authorize">>,
<<"delete-nodes">>,
<<"delete-items">>,
<<"get-pending">>,
<<"instant-nodes">>,
<<"manage-subscriptions">>,
<<"modify-affiliations">>,
<<"outcast-affiliation">>,
<<"persistent-items">>,
<<"multi-items">>,
<<"publish">>,
<<"publish-only-affiliation">>,
<<"publish-options">>,
<<"purge-nodes">>,
<<"retract-items">>,
<<"retrieve-affiliations">>,
<<"retrieve-items">>,
<<"retrieve-subscriptions">>,
<<"subscribe">>,
%%<<"subscription-options">>,
<<"subscription-notifications">>].
%% @doc Checks if the current user has the permission to create the requested node
%% <p>In flat node, any unused node name is allowed. The access parameter is also
%% checked. This parameter depends on the value of the
%% <tt>access_createnode</tt> ACL value in ejabberd config file.</p>
create_node_permission(Host, ServerHost, _Node, _ParentNode, Owner, Access) ->
LOwner = jid:tolower(Owner),
Allowed = case LOwner of
{<<"">>, Host, <<"">>} ->
true; % pubsub service always allowed
_ ->
acl:match_rule(ServerHost, Access, LOwner) =:= allow
end,
{result, Allowed}.
create_node(Nidx, Owner) ->
OwnerKey = jid:tolower(jid:remove_resource(Owner)),
set_state(#pubsub_state{stateid = {OwnerKey, Nidx},
nodeidx = Nidx, affiliation = owner}),
{result, {default, broadcast}}.
delete_node(Nodes) ->
Tr = fun (#pubsub_state{stateid = {J, _}, subscriptions = Ss}) ->
lists:map(fun (S) -> {J, S} end, Ss)
end,
Reply = lists:map(fun (#pubsub_node{id = Nidx} = PubsubNode) ->
{result, States} = get_states(Nidx),
lists:foreach(fun (State) ->
del_items(Nidx, State#pubsub_state.items),
del_state(State#pubsub_state{items = []})
end, States),
del_orphan_items(Nidx),
{PubsubNode, lists:flatmap(Tr, States)}
end, Nodes),
{result, {default, broadcast, Reply}}.
%% @doc <p>Accepts or rejects subcription requests on a PubSub node.</p>
%% <p>The mechanism works as follow:
%% <ul>
%% <li>The main PubSub module prepares the subscription and passes the
%% result of the preparation as a record.</li>
%% <li>This function gets the prepared record and several other parameters and
%% can decide to:<ul>
%% <li>reject the subscription;</li>
%% <li>allow it as is, letting the main module perform the database
%% persistence;</li>
%% <li>allow it, modifying the record. The main module will store the
%% modified record;</li>
%% <li>allow it, but perform the needed persistence operations.</li></ul>
%% </li></ul></p>
%% <p>The selected behaviour depends on the return parameter:
%% <ul>
%% <li><tt>{error, Reason}</tt>: an IQ error result will be returned. No
%% subscription will actually be performed.</li>
%% <li><tt>true</tt>: Subscribe operation is allowed, based on the
%% unmodified record passed in parameter <tt>SubscribeResult</tt>. If this
%% parameter contains an error, no subscription will be performed.</li>
%% <li><tt>{true, PubsubState}</tt>: Subscribe operation is allowed, but
%% the {@link mod_pubsub:pubsubState()} record returned replaces the value
%% passed in parameter <tt>SubscribeResult</tt>.</li>
%% <li><tt>{true, done}</tt>: Subscribe operation is allowed, but the
%% {@link mod_pubsub:pubsubState()} will be considered as already stored and
%% no further persistence operation will be performed. This case is used,
%% when the plugin module is doing the persistence by itself or when it want
%% to completely disable persistence.</li></ul>
%% </p>
%% <p>In the default plugin module, the record is unchanged.</p>
subscribe_node(Nidx, Sender, Subscriber, AccessModel,
SendLast, PresenceSubscription, RosterGroup, _Options) ->
SubKey = jid:tolower(Subscriber),
GenKey = jid:remove_resource(SubKey),
Authorized = jid:tolower(jid:remove_resource(Sender)) == GenKey,
GenState = get_state(Nidx, GenKey),
SubState = case SubKey of
GenKey -> GenState;
_ -> get_state(Nidx, SubKey)
end,
Affiliation = GenState#pubsub_state.affiliation,
Subscriptions = SubState#pubsub_state.subscriptions,
Whitelisted = lists:member(Affiliation, [member, publisher, owner]),
PendingSubscription = lists:any(fun
({pending, _}) -> true;
(_) -> false
end,
Subscriptions),
Owner = Affiliation == owner,
if not Authorized ->
{error,
mod_pubsub:extended_error((xmpp:err_bad_request()), mod_pubsub:err_invalid_jid())};
(Affiliation == outcast) or (Affiliation == publish_only) ->
{error, xmpp:err_forbidden()};
PendingSubscription ->
{error,
mod_pubsub:extended_error((xmpp:err_not_authorized()), mod_pubsub:err_pending_subscription())};
(AccessModel == presence) and (not PresenceSubscription) and (not Owner) ->
{error,
mod_pubsub:extended_error((xmpp:err_not_authorized()), mod_pubsub:err_presence_subscription_required())};
(AccessModel == roster) and (not RosterGroup) and (not Owner) ->
{error,
mod_pubsub:extended_error((xmpp:err_not_authorized()), mod_pubsub:err_not_in_roster_group())};
(AccessModel == whitelist) and (not Whitelisted) and (not Owner) ->
{error,
mod_pubsub:extended_error((xmpp:err_not_allowed()), mod_pubsub:err_closed_node())};
%%MustPay ->
%% % Payment is required for a subscription
%% {error, ?ERR_PAYMENT_REQUIRED};
%%ForbiddenAnonymous ->
%% % Requesting entity is anonymous
%% {error, xmpp:err_forbidden()};
true ->
%%SubId = pubsub_subscription:add_subscription(Subscriber, Nidx, Options),
{NewSub, SubId} = case Subscriptions of
[{subscribed, Id}|_] ->
{subscribed, Id};
[] ->
Id = pubsub_subscription:make_subid(),
Sub = case AccessModel of
authorize -> pending;
_ -> subscribed
end,
set_state(SubState#pubsub_state{subscriptions =
[{Sub, Id} | Subscriptions]}),
{Sub, Id}
end,
case {NewSub, SendLast} of
{subscribed, never} ->
{result, {default, subscribed, SubId}};
{subscribed, _} ->
{result, {default, subscribed, SubId, send_last}};
{_, _} ->
{result, {default, pending, SubId}}
end
end.
%% @doc <p>Unsubscribe the <tt>Subscriber</tt> from the <tt>Node</tt>.</p>
unsubscribe_node(Nidx, Sender, Subscriber, SubId) ->
SubKey = jid:tolower(Subscriber),
GenKey = jid:remove_resource(SubKey),
Authorized = jid:tolower(jid:remove_resource(Sender)) == GenKey,
GenState = get_state(Nidx, GenKey),
SubState = case SubKey of
GenKey -> GenState;
_ -> get_state(Nidx, SubKey)
end,
Subscriptions = lists:filter(fun
({_Sub, _SubId}) -> true;
(_SubId) -> false
end,
SubState#pubsub_state.subscriptions),
SubIdExists = case SubId of
<<>> -> false;
Binary when is_binary(Binary) -> true;
_ -> false
end,
if
%% Requesting entity is prohibited from unsubscribing entity
not Authorized ->
{error, xmpp:err_forbidden()};
%% Entity did not specify SubId
%%SubId == "", ?? ->
%% {error, mod_pubsub:extended_error(xmpp:err_bad_request(), "subid-required")};
%% Invalid subscription identifier
%%InvalidSubId ->
%% {error, mod_pubsub:extended_error(?ERR_NOT_ACCEPTABLE, "invalid-subid")};
%% Requesting entity is not a subscriber
Subscriptions == [] ->
{error,
mod_pubsub:extended_error(xmpp:err_unexpected_request(), mod_pubsub:err_not_subscribed())};
%% Subid supplied, so use that.
SubIdExists ->
Sub = first_in_list(fun
({_, S}) when S == SubId -> true;
(_) -> false
end,
SubState#pubsub_state.subscriptions),
case Sub of
{value, S} ->
delete_subscriptions(SubState, [S]),
{result, default};
false ->
{error,
mod_pubsub:extended_error(xmpp:err_unexpected_request(), mod_pubsub:err_not_subscribed())}
end;
%% Asking to remove all subscriptions to the given node
SubId == all ->
delete_subscriptions(SubState, Subscriptions),
{result, default};
%% No subid supplied, but there's only one matching subscription
length(Subscriptions) == 1 ->
delete_subscriptions(SubState, Subscriptions),
{result, default};
%% No subid and more than one possible subscription match.
true ->
{error,
mod_pubsub:extended_error((xmpp:err_bad_request()), mod_pubsub:err_subid_required())}
end.
delete_subscriptions(SubState, Subscriptions) ->
NewSubs = lists:foldl(fun ({Subscription, SubId}, Acc) ->
%%pubsub_subscription:delete_subscription(SubKey, Nidx, SubId),
Acc -- [{Subscription, SubId}]
end, SubState#pubsub_state.subscriptions, Subscriptions),
case {SubState#pubsub_state.affiliation, NewSubs} of
{none, []} -> del_state(SubState);
_ -> set_state(SubState#pubsub_state{subscriptions = NewSubs})
end.
%% @doc <p>Publishes the item passed as parameter.</p>
%% <p>The mechanism works as follow:
%% <ul>
%% <li>The main PubSub module prepares the item to publish and passes the
%% result of the preparation as a {@link mod_pubsub:pubsubItem()} record.</li>
%% <li>This function gets the prepared record and several other parameters and can decide to:<ul>
%% <li>reject the publication;</li>
%% <li>allow the publication as is, letting the main module perform the database persistence;</li>
%% <li>allow the publication, modifying the record. The main module will store the modified record;</li>
%% <li>allow it, but perform the needed persistence operations.</li></ul>
%% </li></ul></p>
%% <p>The selected behaviour depends on the return parameter:
%% <ul>
%% <li><tt>{error, Reason}</tt>: an iq error result will be return. No
%% publication is actually performed.</li>
%% <li><tt>true</tt>: Publication operation is allowed, based on the
%% unmodified record passed in parameter <tt>Item</tt>. If the <tt>Item</tt>
%% parameter contains an error, no subscription will actually be
%% performed.</li>
%% <li><tt>{true, Item}</tt>: Publication operation is allowed, but the
%% {@link mod_pubsub:pubsubItem()} record returned replaces the value passed
%% in parameter <tt>Item</tt>. The persistence will be performed by the main
%% module.</li>
%% <li><tt>{true, done}</tt>: Publication operation is allowed, but the
%% {@link mod_pubsub:pubsubItem()} will be considered as already stored and
%% no further persistence operation will be performed. This case is used,
%% when the plugin module is doing the persistence by itself or when it want
%% to completely disable persistence.</li></ul>
%% </p>
%% <p>In the default plugin module, the record is unchanged.</p>
publish_item(Nidx, Publisher, PublishModel, MaxItems, ItemId, Payload,
_PubOpts) ->
SubKey = jid:tolower(Publisher),
GenKey = jid:remove_resource(SubKey),
GenState = get_state(Nidx, GenKey),
SubState = case SubKey of
GenKey -> GenState;
_ -> get_state(Nidx, SubKey)
end,
Affiliation = GenState#pubsub_state.affiliation,
Subscribed = case PublishModel of
subscribers -> is_subscribed(GenState#pubsub_state.subscriptions) orelse
is_subscribed(SubState#pubsub_state.subscriptions);
_ -> undefined
end,
if not ((PublishModel == open) or
(PublishModel == publishers) and
((Affiliation == owner)
or (Affiliation == publisher)
or (Affiliation == publish_only))
or (Subscribed == true)) ->
{error, xmpp:err_forbidden()};
true ->
if MaxItems > 0;
MaxItems == unlimited ->
Now = erlang:timestamp(),
case get_item(Nidx, ItemId) of
{result, #pubsub_item{creation = {_, GenKey}} = OldItem} ->
set_item(OldItem#pubsub_item{
modification = {Now, SubKey},
payload = Payload}),
{result, {default, broadcast, []}};
{result, _} ->
{error, xmpp:err_forbidden()};
_ ->
Items = [ItemId | GenState#pubsub_state.items],
{result, {NI, OI}} = remove_extra_items(Nidx, MaxItems, Items),
set_state(GenState#pubsub_state{items = NI}),
set_item(#pubsub_item{
itemid = {ItemId, Nidx},
nodeidx = Nidx,
creation = {Now, GenKey},
modification = {Now, SubKey},
payload = Payload}),
{result, {default, broadcast, OI}}
end;
true ->
{result, {default, broadcast, []}}
end
end.
remove_extra_items(Nidx, MaxItems) ->
{result, States} = get_states(Nidx),
Records = States ++ mnesia:read({pubsub_orphan, Nidx}),
ItemIds = lists:flatmap(fun(#pubsub_state{items = Is}) ->
Is;
(#pubsub_orphan{items = Is}) ->
Is
end, Records),
remove_extra_items(Nidx, MaxItems, ItemIds).
%% @doc <p>This function is used to remove extra items, most notably when the
%% maximum number of items has been reached.</p>
%% <p>This function is used internally by the core PubSub module, as no
%% permission check is performed.</p>
%% <p>In the default plugin module, the oldest items are removed, but other
%% rules can be used.</p>
%% <p>If another PubSub plugin wants to delegate the item removal (and if the
%% plugin is using the default pubsub storage), it can implements this function like this:
%% ```remove_extra_items(Nidx, MaxItems, ItemIds) ->
%% node_default:remove_extra_items(Nidx, MaxItems, ItemIds).'''</p>
remove_extra_items(_Nidx, unlimited, ItemIds) ->
{result, {ItemIds, []}};
remove_extra_items(Nidx, MaxItems, ItemIds) ->
NewItems = lists:sublist(ItemIds, MaxItems),
OldItems = lists:nthtail(length(NewItems), ItemIds),
del_items(Nidx, OldItems),
{result, {NewItems, OldItems}}.
remove_expired_items(_Nidx, infinity) ->
{result, []};
remove_expired_items(Nidx, Seconds) ->
Items = mnesia:index_read(pubsub_item, Nidx, #pubsub_item.nodeidx),
ExpT = misc:usec_to_now(
erlang:system_time(microsecond) - (Seconds * 1000000)),
ExpItems = lists:filtermap(
fun(#pubsub_item{itemid = {ItemId, _},
modification = {ModT, _}}) when ModT < ExpT ->
{true, ItemId};
(#pubsub_item{}) ->
false
end, Items),
del_items(Nidx, ExpItems),
{result, ExpItems}.
%% @doc <p>Triggers item deletion.</p>
%% <p>Default plugin: The user performing the deletion must be the node owner
%% or a publisher, or PublishModel being open.</p>
delete_item(Nidx, Publisher, PublishModel, ItemId) ->
SubKey = jid:tolower(Publisher),
GenKey = jid:remove_resource(SubKey),
GenState = get_state(Nidx, GenKey),
#pubsub_state{affiliation = Affiliation, items = Items} = GenState,
Allowed = Affiliation == publisher orelse
Affiliation == owner orelse
(PublishModel == open andalso
case get_item(Nidx, ItemId) of
{result, #pubsub_item{creation = {_, GenKey}}} -> true;
_ -> false
end),
if not Allowed ->
{error, xmpp:err_forbidden()};
true ->
case lists:member(ItemId, Items) of
true ->
del_item(Nidx, ItemId),
set_state(GenState#pubsub_state{items = lists:delete(ItemId, Items)}),
{result, {default, broadcast}};
false ->
case Affiliation of
owner ->
{result, States} = get_states(Nidx),
Records = States ++ mnesia:read({pubsub_orphan, Nidx}),
lists:foldl(fun
(#pubsub_state{items = RI} = S, Res) ->
case lists:member(ItemId, RI) of
true ->
NI = lists:delete(ItemId, RI),
del_item(Nidx, ItemId),
mnesia:write(S#pubsub_state{items = NI}),
{result, {default, broadcast}};
false ->
Res
end;
(#pubsub_orphan{items = RI} = S, Res) ->
case lists:member(ItemId, RI) of
true ->
NI = lists:delete(ItemId, RI),
del_item(Nidx, ItemId),
mnesia:write(S#pubsub_orphan{items = NI}),
{result, {default, broadcast}};
false ->
Res
end
end,
{error, xmpp:err_item_not_found()}, Records);
_ ->
{error, xmpp:err_forbidden()}
end
end
end.
purge_node(Nidx, Owner) ->
SubKey = jid:tolower(Owner),
GenKey = jid:remove_resource(SubKey),
GenState = get_state(Nidx, GenKey),
case GenState of
#pubsub_state{affiliation = owner} ->
{result, States} = get_states(Nidx),
lists:foreach(fun
(#pubsub_state{items = []}) ->
ok;
(#pubsub_state{items = Items} = S) ->
del_items(Nidx, Items),
set_state(S#pubsub_state{items = []})
end,
States),
del_orphan_items(Nidx),
{result, {default, broadcast}};
_ ->
{error, xmpp:err_forbidden()}
end.
%% @doc <p>Return the current affiliations for the given user</p>
%% <p>The default module reads affiliations in the main Mnesia
%% <tt>pubsub_state</tt> table. If a plugin stores its data in the same
%% table, it should return an empty list, as the affiliation will be read by
%% the default PubSub module. Otherwise, it should return its own affiliation,
%% that will be added to the affiliation stored in the main
%% <tt>pubsub_state</tt> table.</p>
get_entity_affiliations(Host, Owner) ->
SubKey = jid:tolower(Owner),
GenKey = jid:remove_resource(SubKey),
States = mnesia:match_object(#pubsub_state{stateid = {GenKey, '_'}, _ = '_'}),
NodeTree = mod_pubsub:tree(Host),
Reply = lists:foldl(fun (#pubsub_state{stateid = {_, N}, affiliation = A}, Acc) ->
case NodeTree:get_node(N) of
#pubsub_node{nodeid = {Host, _}} = Node -> [{Node, A} | Acc];
_ -> Acc
end
end,
[], States),
{result, Reply}.
get_node_affiliations(Nidx) ->
{result, States} = get_states(Nidx),
Tr = fun (#pubsub_state{stateid = {J, _}, affiliation = A}) -> {J, A} end,
{result, lists:map(Tr, States)}.
get_affiliation(Nidx, Owner) ->
SubKey = jid:tolower(Owner),
GenKey = jid:remove_resource(SubKey),
#pubsub_state{affiliation = Affiliation} = get_state(Nidx, GenKey),
{result, Affiliation}.
set_affiliation(Nidx, Owner, Affiliation) ->
SubKey = jid:tolower(Owner),
GenKey = jid:remove_resource(SubKey),
GenState = get_state(Nidx, GenKey),
case {Affiliation, GenState#pubsub_state.subscriptions} of
{none, []} -> {result, del_state(GenState)};
_ -> {result, set_state(GenState#pubsub_state{affiliation = Affiliation})}
end.
%% @doc <p>Return the current subscriptions for the given user</p>
%% <p>The default module reads subscriptions in the main Mnesia
%% <tt>pubsub_state</tt> table. If a plugin stores its data in the same
%% table, it should return an empty list, as the affiliation will be read by
%% the default PubSub module. Otherwise, it should return its own affiliation,
%% that will be added to the affiliation stored in the main
%% <tt>pubsub_state</tt> table.</p>
get_entity_subscriptions(Host, Owner) ->
{U, D, _} = SubKey = jid:tolower(Owner),
GenKey = jid:remove_resource(SubKey),
States = case SubKey of
GenKey ->
mnesia:match_object(#pubsub_state{stateid = {{U, D, '_'}, '_'}, _ = '_'});
_ ->
mnesia:match_object(#pubsub_state{stateid = {GenKey, '_'}, _ = '_'})
++
mnesia:match_object(#pubsub_state{stateid = {SubKey, '_'}, _ = '_'})
end,
NodeTree = mod_pubsub:tree(Host),
Reply = lists:foldl(fun (#pubsub_state{stateid = {J, N}, subscriptions = Ss}, Acc) ->
case NodeTree:get_node(N) of
#pubsub_node{nodeid = {Host, _}} = Node ->
lists:foldl(fun ({Sub, SubId}, Acc2) ->
[{Node, Sub, SubId, J} | Acc2]
end,
Acc, Ss);
_ ->
Acc
end
end,
[], States),
{result, Reply}.
get_node_subscriptions(Nidx) ->
{result, States} = get_states(Nidx),
Tr = fun (#pubsub_state{stateid = {J, _}, subscriptions = Subscriptions}) ->
lists:foldl(fun ({S, SubId}, Acc) ->
[{J, S, SubId} | Acc]
end,
[], Subscriptions)
end,
{result, lists:flatmap(Tr, States)}.
get_subscriptions(Nidx, Owner) ->
SubKey = jid:tolower(Owner),
SubState = get_state(Nidx, SubKey),
{result, SubState#pubsub_state.subscriptions}.
set_subscriptions(Nidx, Owner, Subscription, SubId) ->
SubKey = jid:tolower(Owner),
SubState = get_state(Nidx, SubKey),
case {SubId, SubState#pubsub_state.subscriptions} of
{_, []} ->
case Subscription of
none ->
{error,
mod_pubsub:extended_error((xmpp:err_bad_request()), mod_pubsub:err_not_subscribed())};
_ ->
new_subscription(Nidx, Owner, Subscription, SubState)
end;
{<<>>, [{_, SID}]} ->
case Subscription of
none -> unsub_with_subid(SubState, SID);
_ -> replace_subscription({Subscription, SID}, SubState)
end;
{<<>>, [_ | _]} ->
{error,
mod_pubsub:extended_error((xmpp:err_bad_request()), mod_pubsub:err_subid_required())};
_ ->
case Subscription of
none -> unsub_with_subid(SubState, SubId);
_ -> replace_subscription({Subscription, SubId}, SubState)
end
end.
replace_subscription(NewSub, SubState) ->
NewSubs = replace_subscription(NewSub, SubState#pubsub_state.subscriptions, []),
{result, set_state(SubState#pubsub_state{subscriptions = NewSubs})}.
replace_subscription(_, [], Acc) -> Acc;
replace_subscription({Sub, SubId}, [{_, SubId} | T], Acc) ->
replace_subscription({Sub, SubId}, T, [{Sub, SubId} | Acc]).
new_subscription(_Nidx, _Owner, Sub, SubState) ->
%%SubId = pubsub_subscription:add_subscription(Owner, Nidx, []),
SubId = pubsub_subscription:make_subid(),
Subs = SubState#pubsub_state.subscriptions,
set_state(SubState#pubsub_state{subscriptions = [{Sub, SubId} | Subs]}),
{result, {Sub, SubId}}.
unsub_with_subid(SubState, SubId) ->
%%pubsub_subscription:delete_subscription(SubState#pubsub_state.stateid, Nidx, SubId),
NewSubs = [{S, Sid}
|| {S, Sid} <- SubState#pubsub_state.subscriptions,
SubId =/= Sid],
case {NewSubs, SubState#pubsub_state.affiliation} of
{[], none} -> {result, del_state(SubState)};
_ -> {result, set_state(SubState#pubsub_state{subscriptions = NewSubs})}
end.
%% @doc <p>Returns a list of Owner's nodes on Host with pending
%% subscriptions.</p>
get_pending_nodes(Host, Owner) ->
GenKey = jid:remove_resource(jid:tolower(Owner)),
States = mnesia:match_object(#pubsub_state{stateid = {GenKey, '_'},
affiliation = owner,
_ = '_'}),
NodeIdxs = [Nidx || #pubsub_state{stateid = {_, Nidx}} <- States],
NodeTree = mod_pubsub:tree(Host),
Reply = mnesia:foldl(fun (#pubsub_state{stateid = {_, Nidx}} = S, Acc) ->
case lists:member(Nidx, NodeIdxs) of
true ->
case get_nodes_helper(NodeTree, S) of
{value, Node} -> [Node | Acc];
false -> Acc
end;
false ->
Acc
end
end,
[], pubsub_state),
{result, Reply}.
get_nodes_helper(NodeTree, #pubsub_state{stateid = {_, N}, subscriptions = Subs}) ->
HasPending = fun
({pending, _}) -> true;
(pending) -> true;
(_) -> false
end,
case lists:any(HasPending, Subs) of
true ->
case NodeTree:get_node(N) of
#pubsub_node{nodeid = {_, Node}} -> {value, Node};
_ -> false
end;
false ->
false
end.
%% @doc Returns the list of stored states for a given node.
%% <p>For the default PubSub module, states are stored in Mnesia database.</p>
%% <p>We can consider that the pubsub_state table have been created by the main
%% mod_pubsub module.</p>
%% <p>PubSub plugins can store the states where they wants (for example in a
%% relational database).</p>
%% <p>If a PubSub plugin wants to delegate the states storage to the default node,
%% they can implement this function like this:
%% ```get_states(Nidx) ->
%% node_default:get_states(Nidx).'''</p>
get_states(Nidx) ->
States = case catch mnesia:index_read(pubsub_state, Nidx, #pubsub_state.nodeidx) of
List when is_list(List) -> List;
_ -> []
end,
{result, States}.
%% @doc <p>Returns a state (one state list), given its reference.</p>
get_state(Nidx, Key) ->
StateId = {Key, Nidx},
case catch mnesia:read({pubsub_state, StateId}) of
[State] when is_record(State, pubsub_state) -> State;
_ -> #pubsub_state{stateid = StateId, nodeidx = Nidx}
end.
%% @doc <p>Write a state into database.</p>
set_state(State) when is_record(State, pubsub_state) ->
mnesia:write(State).
%set_state(_) -> {error, ?ERR_INTERNAL_SERVER_ERROR}.
%% @doc <p>Delete a state from database.</p>
del_state(#pubsub_state{stateid = {Key, Nidx}, items = Items}) ->
case Items of
[] ->
ok;
_ ->
Orphan = #pubsub_orphan{nodeid = Nidx, items =
case mnesia:read({pubsub_orphan, Nidx}) of
[#pubsub_orphan{items = ItemIds}] ->
lists:usort(ItemIds++Items);
_ ->
Items
end},
mnesia:write(Orphan)
end,
mnesia:delete({pubsub_state, {Key, Nidx}}).
%% @doc Returns the list of stored items for a given node.
%% <p>For the default PubSub module, items are stored in Mnesia database.</p>
%% <p>We can consider that the pubsub_item table have been created by the main
%% mod_pubsub module.</p>
%% <p>PubSub plugins can store the items where they wants (for example in a
%% relational database), or they can even decide not to persist any items.</p>
get_items(Nidx, _From, undefined) ->
RItems = lists:keysort(#pubsub_item.creation,
mnesia:index_read(pubsub_item, Nidx, #pubsub_item.nodeidx)),
{result, {RItems, undefined}};
get_items(Nidx, _From, #rsm_set{max = Max, index = IncIndex,
'after' = After, before = Before}) ->
case lists:keysort(#pubsub_item.creation,
mnesia:index_read(pubsub_item, Nidx, #pubsub_item.nodeidx)) of
[] ->
{result, {[], #rsm_set{count = 0}}};
RItems ->
Count = length(RItems),
Limit = case Max of
undefined -> ?MAXITEMS;
_ -> Max
end,
{Offset, ItemsPage} =
case {IncIndex, Before, After} of
{undefined, undefined, undefined} ->
{0, lists:sublist(RItems, Limit)};
{I, undefined, undefined} ->
SubList = lists:nthtail(I, RItems),
{I, lists:sublist(SubList, Limit)};
{_, <<>>, undefined} ->
%% 2.5 Requesting the Last Page in a Result Set
SubList = lists:reverse(RItems),
{Count-Limit, lists:reverse(lists:sublist(SubList, Limit))};
{_, Stamp, undefined} ->
BeforeNow = encode_stamp(Stamp),
{NewIndex, SubList} = extract_sublist(before_now, BeforeNow,
0, lists:reverse(RItems)),
{Count-NewIndex-Limit, lists:reverse(lists:sublist(SubList, Limit))};
{_, undefined, Stamp} ->
AfterNow = encode_stamp(Stamp),
{NewIndex, SubList} = extract_sublist(after_now, AfterNow,
0, RItems),
{NewIndex, lists:sublist(SubList, Limit)}
end,
Rsm = rsm_page(Count, IncIndex, Offset, ItemsPage),
{result, {ItemsPage, Rsm}}
end.
get_items(Nidx, JID, AccessModel, PresenceSubscription, RosterGroup, _SubId, RSM) ->
SubKey = jid:tolower(JID),
GenKey = jid:remove_resource(SubKey),
GenState = get_state(Nidx, GenKey),
SubState = get_state(Nidx, SubKey),
Affiliation = GenState#pubsub_state.affiliation,
BareSubscriptions = GenState#pubsub_state.subscriptions,
FullSubscriptions = SubState#pubsub_state.subscriptions,
Whitelisted = can_fetch_item(Affiliation, BareSubscriptions) orelse
can_fetch_item(Affiliation, FullSubscriptions),
if %%SubId == "", ?? ->
%% Entity has multiple subscriptions to the node but does not specify a subscription ID
%{error, mod_pubsub:extended_error(xmpp:err_bad_request(), "subid-required")};
%%InvalidSubId ->
%% Entity is subscribed but specifies an invalid subscription ID
%{error, mod_pubsub:extended_error(?ERR_NOT_ACCEPTABLE, "invalid-subid")};
(Affiliation == outcast) or (Affiliation == publish_only) ->
{error, xmpp:err_forbidden()};
(AccessModel == presence) and not PresenceSubscription ->
{error,
mod_pubsub:extended_error((xmpp:err_not_authorized()), mod_pubsub:err_presence_subscription_required())};
(AccessModel == roster) and not RosterGroup ->
{error,
mod_pubsub:extended_error((xmpp:err_not_authorized()), mod_pubsub:err_not_in_roster_group())};
(AccessModel == whitelist) and not Whitelisted ->
{error,
mod_pubsub:extended_error((xmpp:err_not_allowed()), mod_pubsub:err_closed_node())};
(AccessModel == authorize) and not Whitelisted ->
{error, xmpp:err_forbidden()};
%%MustPay ->
%% % Payment is required for a subscription
%% {error, ?ERR_PAYMENT_REQUIRED};
true ->
get_items(Nidx, JID, RSM)
end.
extract_sublist(A, Now, Index, [#pubsub_item{creation = {Creation, _}} | RItems])
when ((A == before_now) and (Creation >= Now))
or ((A == after_now) and (Creation =< Now)) ->
extract_sublist(A, Now, Index+1, RItems);
extract_sublist(_, _, Index, RItems) ->
{Index, RItems}.
get_only_item(Nidx, From) ->
get_last_items(Nidx, From, 1).
get_last_items(Nidx, _From, Count) when Count > 0 ->
Items = mnesia:index_read(pubsub_item, Nidx, #pubsub_item.nodeidx),
LastItems = lists:reverse(lists:keysort(#pubsub_item.modification, Items)),
{result, lists:sublist(LastItems, Count)};
get_last_items(_Nidx, _From, _Count) ->
{result, []}.
%% @doc <p>Returns an item (one item list), given its reference.</p>
get_item(Nidx, ItemId) ->
case mnesia:read({pubsub_item, {ItemId, Nidx}}) of
[Item] when is_record(Item, pubsub_item) -> {result, Item};
_ -> {error, xmpp:err_item_not_found()}
end.
get_item(Nidx, ItemId, JID, AccessModel, PresenceSubscription, RosterGroup, _SubId) ->
SubKey = jid:tolower(JID),
GenKey = jid:remove_resource(SubKey),
GenState = get_state(Nidx, GenKey),
Affiliation = GenState#pubsub_state.affiliation,
Subscriptions = GenState#pubsub_state.subscriptions,
Whitelisted = can_fetch_item(Affiliation, Subscriptions),
if %%SubId == "", ?? ->
%% Entity has multiple subscriptions to the node but does not specify a subscription ID
%{error, mod_pubsub:extended_error(xmpp:err_bad_request(), "subid-required")};
%%InvalidSubId ->
%% Entity is subscribed but specifies an invalid subscription ID
%{error, mod_pubsub:extended_error(?ERR_NOT_ACCEPTABLE, "invalid-subid")};
(Affiliation == outcast) or (Affiliation == publish_only) ->
{error, xmpp:err_forbidden()};
(AccessModel == presence) and not PresenceSubscription ->
{error,
mod_pubsub:extended_error((xmpp:err_not_authorized()), mod_pubsub:err_presence_subscription_required())};
(AccessModel == roster) and not RosterGroup ->
{error,
mod_pubsub:extended_error((xmpp:err_not_authorized()), mod_pubsub:err_not_in_roster_group())};
(AccessModel == whitelist) and not Whitelisted ->
{error,
mod_pubsub:extended_error((xmpp:err_not_allowed()), mod_pubsub:err_closed_node())};
(AccessModel == authorize) and not Whitelisted ->
{error, xmpp:err_forbidden()};
%%MustPay ->
%% % Payment is required for a subscription
%% {error, ?ERR_PAYMENT_REQUIRED};
true ->
get_item(Nidx, ItemId)
end.
%% @doc <p>Write an item into database.</p>
set_item(Item) when is_record(Item, pubsub_item) ->
mnesia:write(Item).
%set_item(_) -> {error, ?ERR_INTERNAL_SERVER_ERROR}.
%% @doc <p>Delete an item from database.</p>
del_item(Nidx, ItemId) ->
mnesia:delete({pubsub_item, {ItemId, Nidx}}).
del_items(Nidx, ItemIds) ->
lists:foreach(fun (ItemId) -> del_item(Nidx, ItemId)
end,
ItemIds).
del_orphan_items(Nidx) ->
case mnesia:read({pubsub_orphan, Nidx}) of
[#pubsub_orphan{items = ItemIds}] ->
del_items(Nidx, ItemIds),
mnesia:delete({pubsub_orphan, Nidx});
_ ->
ok
end.
get_item_name(_Host, _Node, Id) ->
{result, Id}.
%% @doc <p>Return the path of the node. In flat it's just node id.</p>
node_to_path(Node) ->
{result, [Node]}.
path_to_node(Path) ->
{result,
case Path of
%% default slot
[Node] -> iolist_to_binary(Node);
%% handle old possible entries, used when migrating database content to new format
[Node | _] when is_binary(Node) ->
iolist_to_binary(str:join([<<"">> | Path], <<"/">>));
%% default case (used by PEP for example)
_ -> iolist_to_binary(Path)
end}.
can_fetch_item(owner, _) -> true;
can_fetch_item(member, _) -> true;
can_fetch_item(publisher, _) -> true;
can_fetch_item(publish_only, _) -> false;
can_fetch_item(outcast, _) -> false;
can_fetch_item(none, Subscriptions) -> is_subscribed(Subscriptions).
%can_fetch_item(_Affiliation, _Subscription) -> false.
is_subscribed(Subscriptions) ->
lists:any(fun
({subscribed, _SubId}) -> true;
(_) -> false
end,
Subscriptions).
first_in_list(_Pred, []) ->
false;
first_in_list(Pred, [H | T]) ->
case Pred(H) of
true -> {value, H};
_ -> first_in_list(Pred, T)
end.
rsm_page(Count, _, _, []) ->
#rsm_set{count = Count};
rsm_page(Count, Index, Offset, Items) ->
FirstItem = hd(Items),
LastItem = lists:last(Items),
First = decode_stamp(element(1, FirstItem#pubsub_item.creation)),
Last = decode_stamp(element(1, LastItem#pubsub_item.creation)),
#rsm_set{count = Count, index = Index,
first = #rsm_first{index = Offset, data = First},
last = Last}.
encode_stamp(Stamp) ->
try xmpp_util:decode_timestamp(Stamp)
catch _:{bad_timestamp, _} ->
Stamp % We should return a proper error to the client instead.
end.
decode_stamp(Stamp) ->
xmpp_util:encode_timestamp(Stamp).
transform({pubsub_state, {Id, Nidx}, Is, A, Ss}) ->
{pubsub_state, {Id, Nidx}, Nidx, Is, A, Ss};
transform({pubsub_item, {Id, Nidx}, C, M, P}) ->
{pubsub_item, {Id, Nidx}, Nidx, C, M, P};
transform(Rec) ->
Rec.
