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%%%------------------------------------------------------------------- |
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%%% @copyright (C) 2021, Erlang-Solutions |
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%%% @doc |
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%%% This module implements [XEP-0333: Chat Markers] helper functions |
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%%% @end |
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%%%------------------------------------------------------------------- |
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-module(mongoose_chat_markers). |
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-include("mongoose_ns.hrl"). |
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-include_lib("exml/include/exml.hrl"). |
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%% Markers |
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-export([has_chat_markers/1, |
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list_chat_markers/1, |
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chat_marker_names/0]). |
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-type id() :: binary(). |
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-type chat_marker_type() :: received | displayed | acknowledged. |
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-type chat_marker_element() :: {chat_marker_type(), id()}. |
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-export_type([chat_marker_type/0]). |
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-export_type([chat_marker_element/0]). |
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%% API |
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-spec has_chat_markers(exml:element()) -> boolean(). |
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has_chat_markers(Packet) -> |
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[] =/= list_chat_markers(Packet). |
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-spec list_chat_markers(exml:element()) -> [chat_marker_element()]. |
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list_chat_markers(#xmlel{children = Children}) -> |
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lists:filtermap(fun is_chat_marker_element/1, Children). |
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-spec chat_marker_names() -> [binary()]. |
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chat_marker_names() -> |
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[<<"received">>, <<"displayed">>, <<"acknowledged">>]. |
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%% Internal functions |
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-spec is_chat_marker_element(exml:element()) -> |
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false | {true, {chat_marker_type(), Id :: binary}}. |
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is_chat_marker_element(#xmlel{name = <<"received">>} = El) -> |
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check_chat_marker_attributes(received, El); |
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is_chat_marker_element(#xmlel{name = <<"displayed">>} = El) -> |
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check_chat_marker_attributes(displayed, El); |
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is_chat_marker_element(#xmlel{name = <<"acknowledged">>} = El) -> |
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check_chat_marker_attributes(acknowledged, El); |
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is_chat_marker_element(_) -> |
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false. |
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-spec check_chat_marker_attributes(chat_marker_type(), exml:element()) -> |
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false | {true, chat_marker_element()}. |
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check_chat_marker_attributes(Type, El) -> |
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NS = exml_query:attr(El, <<"xmlns">>), |
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Id = exml_query:attr(El, <<"id">>), |
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?NS_CHAT_MARKERS =:= NS andalso Id =/= undefined andalso {true, {Type, Id}}. |