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-module(mongoose_ldap_worker). |
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-behaviour(gen_server). |
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%% gen_server callbacks |
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-export([init/1, |
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handle_call/3, |
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handle_cast/2, |
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handle_info/2, |
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terminate/2, |
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code_change/3]). |
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-include("mongoose.hrl"). |
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-type state() :: #{handle := none | eldap_utils:handle(), |
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servers := [string()], |
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tls_options := list(), |
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port := pos_integer(), |
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root_dn := binary(), |
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password := binary(), |
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connect_interval := pos_integer()}. |
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-type request() :: {function(), Args :: [any()]}. |
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%% gen_server callbacks |
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-spec init(gen_mod:module_opts()) -> {ok, state()}. |
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init(Options) -> |
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:-( |
State = initial_state(Options), |
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:-( |
self() ! connect, |
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:-( |
{ok, State}. |
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-spec handle_call(request(), {pid(), any()}, state()) -> {reply, any(), state()}. |
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handle_call(Request, _From, State) -> |
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:-( |
{Result, NewState} = call_eldap(Request, State), |
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:-( |
{reply, Result, NewState}. |
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-spec handle_cast(any(), state()) -> {noreply, state()}. |
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handle_cast(Cast, State) -> |
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:-( |
?UNEXPECTED_CAST(Cast), |
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:-( |
{noreply, State}. |
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-spec handle_info(any(), state()) -> {noreply, state()}. |
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handle_info(connect, State) -> |
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:-( |
{noreply, connect(State)}; |
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handle_info(Info, State) -> |
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:-( |
?UNEXPECTED_INFO(Info), |
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:-( |
{noreply, State}. |
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-spec terminate(any(), state()) -> ok. |
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:-( |
terminate(_Reason, #{handle := none}) -> ok; |
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:-( |
terminate(_Reason, #{handle := Handle}) -> eldap:close(Handle). |
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-spec code_change(any(), state(), any()) -> {ok, state()}. |
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code_change(_OldVsn, State, _Extra) -> |
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:-( |
{ok, State}. |
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%% internal functions |
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initial_state(Opts) -> |
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:-( |
Opts#{handle => none}. |
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call_eldap(Request, State) -> |
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:-( |
case do_call_eldap(Request, State) of |
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{error, Reason} when Reason =:= ldap_closed; |
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Reason =:= {gen_tcp_error, closed} -> |
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:-( |
?LOG_INFO(#{what => ldap_request_failed, reason => Reason, |
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:-( |
text => <<"LDAP request failed: connection closed, reconnecting...">>}), |
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:-( |
eldap:close(maps:get(handle, State)), |
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:-( |
NewState = connect(State#{handle := none}), |
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:-( |
retry_call_eldap(Request, NewState); |
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Result -> |
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:-( |
{Result, State} |
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end. |
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connect(State = #{handle := none, |
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servers := Servers, |
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port := Port, |
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root_dn := RootDN, |
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password := Password, |
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connect_interval := ConnectInterval}) -> |
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:-( |
AnonAuth = RootDN =:= <<>> andalso Password =:= <<>>, |
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:-( |
SSLConfig = case State of |
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:-( |
#{tls := TLSOptions} -> [{sslopts, just_tls:make_ssl_opts(TLSOptions)}]; |
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:-( |
#{} -> [] |
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end, |
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:-( |
case eldap:open(Servers, [{port, Port}, {anon_auth, AnonAuth}] ++ SSLConfig) of |
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{ok, Handle} -> |
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:-( |
case eldap:simple_bind(Handle, RootDN, Password) of |
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ok -> |
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:-( |
?LOG_INFO(#{what => ldap_connected, |
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:-( |
text => <<"Connected to LDAP server">>}), |
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:-( |
State#{handle := Handle}; |
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Error -> |
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:-( |
?LOG_ERROR(#{what => ldap_auth_failed, reason => Error, |
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text => <<"LDAP bind returns an error">>, |
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:-( |
ldap_servers => Servers, port => Port}), |
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:-( |
eldap:close(Handle), |
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:-( |
erlang:send_after(ConnectInterval, self(), connect), |
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:-( |
State |
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end; |
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Error -> |
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:-( |
?LOG_ERROR(#{what => ldap_connect_failed, |
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text => <<"LDAP open returns an error">>, |
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:-( |
ldap_servers => Servers, port => Port, reason => Error}), |
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:-( |
erlang:send_after(ConnectInterval, self(), connect), |
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:-( |
State |
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end. |
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retry_call_eldap(Request, State) -> |
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:-( |
Result = do_call_eldap(Request, State), |
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:-( |
{Result, State}. |
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:-( |
do_call_eldap(_Request, #{handle := none}) -> {error, not_connected}; |
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:-( |
do_call_eldap({F, Args}, #{handle := Handle}) -> apply(eldap, F, [Handle | Args]). |