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%%%------------------------------------------------------------------- |
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%%% @author bartek <bartlomiej.gorny@erlang-solutions.com> |
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%%% @copyright (C) 2017, Erlang Solutions sp. z o.o. |
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%%% @doc Generic functions for checking packet against privacy rules. Works by |
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%%% calling 'privacy_check_packet' hooks to which various handlers might be attached. |
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%%% |
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%%% @end |
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%%% Created : 06. Feb 2017 11:37 |
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%%%------------------------------------------------------------------- |
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-module(mongoose_privacy). |
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-author("bartek"). |
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-include("jlib.hrl"). |
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-include("mod_privacy.hrl"). |
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%% API |
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-export([privacy_check_packet/5, privacy_check_packet/6]). |
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-type direction() :: in | out. |
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-type decision() :: allow | deny | block. |
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-type userlist() :: #userlist{}. |
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-export_type([direction/0, decision/0, userlist/0]). |
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%%% API %%% |
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%% @doc abbreviated version - in most cases we have 'from' in Acc, but sometimes |
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%% the caller wants something different (e.g. mod_last which swaps addresses) |
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%% the first arg can be accumulator, if we are checking its element, or a tuple |
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%% {Acc, El} for cases where one acc triggers sending many messages which have to be checked |
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-spec privacy_check_packet(Acc :: mongoose_acc:t() | {mongoose_acc:t(), exml:element()}, |
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JID :: jid:jid(), |
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PrivacyList :: userlist(), |
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To :: jid:jid(), |
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Dir :: direction()) -> {decision(), mongoose_acc:t()}. |
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privacy_check_packet(Acc0, JID, PrivacyList, To, Dir) -> |
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Acc1 = case Acc0 of |
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:-( |
{Acc, #xmlel{}} -> Acc; |
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_ -> Acc0 |
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end, |
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From = mongoose_acc:from_jid(Acc1), |
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privacy_check_packet(Acc0, JID, PrivacyList, From, To, Dir). |
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%% @doc check packet, store result in accumulator, return acc and result for quick check |
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%% Acc can be either a single argument (an Accumulator) or a tuple of {Acc, Stanza} |
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%% in the latter case name and type to check against privacy lists are taken from the Stanza |
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-spec privacy_check_packet(Acc :: mongoose_acc:t() | {mongoose_acc:t(), exml:element()}, |
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JID :: jid:jid(), |
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PrivacyList :: userlist(), |
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From :: jid:jid(), |
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To :: jid:jid(), |
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Dir :: direction()) -> {decision(), mongoose_acc:t()}. |
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privacy_check_packet(Acc0, #jid{luser = LUser, lserver = LServer} = JID, |
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PrivacyList, From, To, Dir) -> |
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% see if we have just Acc or also stanza to check - may have different name/type |
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{Acc, Name, Type} = case Acc0 of |
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{A, #xmlel{name = SName} = Stanza} -> |
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SType = exml_query:attr(Stanza, <<"type">>, undefined), |
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{A, SName, SType}; |
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_ -> |
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{Acc0, mongoose_acc:stanza_name(Acc0), mongoose_acc:stanza_type(Acc0)} |
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end, |
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% check if it is there, if not then set default and run a hook |
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Key = {cached_check, LServer, LUser, From, To, Name, Type, Dir}, |
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case mongoose_acc:get(privacy, Key, undefined, Acc) of |
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undefined -> |
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Acc1 = mongoose_hooks:privacy_check_packet(Acc, JID, PrivacyList, |
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{From, To, Name, Type}, Dir), |
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Res = mongoose_acc:get(hook, result, Acc1), |
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{Res, mongoose_acc:set(privacy, Key, Res, Acc1)}; |
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Res -> |
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{Res, Acc} |
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end. |