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%%============================================================================== |
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%% Copyright 2020 Erlang Solutions Ltd. |
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%% |
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%% Licensed under the Apache License, Version 2.0 (the "License"); |
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%% you may not use this file except in compliance with the License. |
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%% You may obtain a copy of the License at |
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%% |
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%% http://www.apache.org/licenses/LICENSE-2.0 |
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%% |
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%% Unless required by applicable law or agreed to in writing, software |
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%% distributed under the License is distributed on an "AS IS" BASIS, |
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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%% See the License for the specific language governing permissions and |
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%% limitations under the License. |
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%%============================================================================== |
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-module (mod_extdisco). |
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-author('jan.ciesla@erlang-solutions.com'). |
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-xep([{xep, 215}, {version, "0.7"}]). |
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-behaviour(gen_mod). |
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%% gen_mod callbacks. |
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-export([start/2, stop/1, config_spec/0]). |
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-export([process_iq/4]). |
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-ignore_xref([process_iq/4]). |
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-include("jlib.hrl"). |
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-include("mongoose.hrl"). |
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-include("mongoose_config_spec.hrl"). |
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-spec start(jid:server(), list()) -> ok. |
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start(Host, Opts) -> |
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:-( |
IQDisc = gen_mod:get_opt(iqdisc, Opts, no_queue), |
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:-( |
gen_iq_handler:add_iq_handler(ejabberd_local, Host, |
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?NS_EXTDISCO, ?MODULE, process_iq, IQDisc). |
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-spec stop(jid:server()) -> ok. |
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stop(Host) -> |
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:-( |
gen_iq_handler:remove_iq_handler(ejabberd_local, Host, ?NS_EXTDISCO). |
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-spec config_spec() -> mongoose_config_spec:config_section(). |
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config_spec() -> |
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#section{ |
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items = #{<<"service">> => #list{items = service_config_spec(), |
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wrap = none}} |
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}. |
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service_config_spec() -> |
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#section{ |
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items = #{<<"type">> => #option{type = atom, |
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validate = non_empty}, |
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<<"host">> => #option{type = string, |
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validate = non_empty}, |
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<<"port">> => #option{type = integer, |
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validate = port}, |
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<<"transport">> => #option{type = string, |
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validate = {enum, ["udp", "tcp"]}}, |
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<<"username">> => #option{type = string, |
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validate = non_empty}, |
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<<"password">> => #option{type = string, |
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validate = non_empty} |
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}, |
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required = [<<"type">>, <<"host">>] |
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}. |
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-spec process_iq(jid:jid(), jid:jid(), mongoose_acc:t(), jlib:iq()) -> |
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{mongoose_acc:t(), jlib:iq()}. |
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process_iq(_From, _To = #jid{lserver = LServer}, Acc, #iq{type = get, sub_el = SubEl} = IQ) -> |
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{ResponseType, Response} = case request_type(SubEl) of |
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all_services -> |
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:-( |
RequestedServices = get_external_services(LServer), |
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{result, create_iq_response(RequestedServices)}; |
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{credentials, {Type, Host}} -> |
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:-( |
Services = get_external_services(LServer, Type), |
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:-( |
RequestedServices = lists:filter(fun(Opts) -> |
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:-( |
gen_mod:get_opt(host, Opts, undefined) == binary_to_list(Host) |
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end, Services), |
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{result, create_iq_response_credentials(RequestedServices)}; |
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{selected_services, Type} -> |
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RequestedServices = get_external_services(LServer, Type), |
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{result, create_iq_response_services(RequestedServices, Type)}; |
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_ -> |
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{error, [mongoose_xmpp_errors:bad_request()]} |
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end, |
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{Acc, IQ#iq{type = ResponseType, sub_el = Response}}. |
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request_type(#xmlel{name = <<"services">>} = Element) -> |
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:-( |
case exml_query:attr(Element, <<"type">>) of |
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undefined -> all_services; |
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ServiceType -> |
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case catch binary_to_existing_atom(ServiceType, utf8) of |
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{'EXIT', _} -> {error, bad_request}; |
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Type -> {selected_services, Type} |
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end |
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end; |
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request_type(#xmlel{name = <<"credentials">>, children = [Children]}) -> |
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:-( |
Host = exml_query:attr(Children, <<"host">>), |
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case exml_query:attr(Children, <<"type">>) of |
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:-( |
undefined -> {error, bad_request}; |
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ServiceType -> |
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case catch binary_to_existing_atom(ServiceType, utf8) of |
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{'EXIT', _} -> {error, bad_request}; |
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Type -> {credentials, {Type, Host}} |
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end |
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end; |
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request_type(_) -> |
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:-( |
{error, bad_request}. |
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create_iq_response(Services) -> |
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:-( |
#xmlel{name = <<"services">>, |
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attrs = [{<<"xmlns">>, ?NS_EXTDISCO}], |
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children = prepare_services_element(Services)}. |
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create_iq_response_services(Services, Type) -> |
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#xmlel{name = <<"services">>, |
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attrs = [{<<"xmlns">>, ?NS_EXTDISCO}, {<<"type">>, atom_to_binary(Type, utf8)}], |
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children = prepare_services_element(Services)}. |
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create_iq_response_credentials(Services) -> |
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:-( |
#xmlel{name = <<"credentials">>, |
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attrs = [{<<"xmlns">>, ?NS_EXTDISCO}], |
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children = prepare_services_element(Services)}. |
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get_external_services(LServer) -> |
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:-( |
case gen_mod:get_module_opts(LServer, ?MODULE) of |
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:-( |
[] -> []; |
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ServicesWithOpts -> ServicesWithOpts |
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end. |
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get_external_services(LServer, Type) -> |
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[Opts || Opts <- get_external_services(LServer), gen_mod:get_opt(type, Opts) == Type]. |
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prepare_services_element(Services) -> |
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lists:reverse( |
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lists:foldl( |
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fun(Opts, Acc) -> |
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RequiredElements = required_elements(Opts), |
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OptionalElements = optional_elements(Opts), |
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NewResult = #xmlel{name = <<"service">>, |
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attrs = RequiredElements ++ OptionalElements}, |
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[NewResult | Acc] |
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end, [], Services)). |
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required_elements(Opts) -> |
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Host = gen_mod:get_opt(host, Opts, <<"">>), |
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Type = gen_mod:get_opt(type, Opts), |
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[{<<"type">>, atom_to_binary(Type, utf8)}, {<<"host">>, Host}]. |
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optional_elements(Opts) -> |
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Port = gen_mod:get_opt(port, Opts, undefined), |
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Transport = gen_mod:get_opt(transport, Opts, undefined), |
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Password = gen_mod:get_opt(password, Opts, undefined), |
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Username = gen_mod:get_opt(username, Opts, undefined), |
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Elements = [{<<"port">>, i2b(Port)}, |
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{<<"transport">>, Transport}, |
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{<<"password">>, Password}, |
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{<<"username">>, Username}], |
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:-( |
filter_undefined_elements(Elements). |
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filter_undefined_elements(Elements) -> |
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:-( |
lists:filter(fun({_, undefined}) -> false; |
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(_) -> true |
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end, Elements). |
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:-( |
i2b(X) when is_integer(X) -> integer_to_binary(X); |
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:-( |
i2b(X) -> X. |