Merge pull request #1789 from Gilbert-Wong/emqx30

Check topic alias

src/emqx_mqtt_caps.erl

@@ -43,7 +43,9 @@
                        {mqtt_wildcard_subscription, true}]).
 
 -define(PUBCAP_KEYS, [max_qos_allowed,
-                      mqtt_retain_available]).
+                      mqtt_retain_available,
+                      mqtt_topic_alias
+                     ]).
 -define(SUBCAP_KEYS, [max_qos_allowed,
                       max_topic_levels,
                       mqtt_shared_subscription,
@@ -60,8 +62,15 @@ do_check_pub(Props = #{qos := QoS}, [{max_qos_allowed, MaxQoS}|Caps]) ->
         true  -> {error, ?RC_QOS_NOT_SUPPORTED};
         false -> do_check_pub(Props, Caps)
     end;
+do_check_pub(Props = #{ topic_alias := TopicAlias}, [{max_topic_alias, MaxTopicAlias}| Caps]) ->
+    case TopicAlias =< MaxTopicAlias andalso TopicAlias > 0 of
+        false -> {error, ?RC_TOPIC_ALIAS_INVALID};
+        true -> do_check_pub(Props, Caps)
+    end;
 do_check_pub(#{retain := true}, [{mqtt_retain_available, false}|_Caps]) ->
     {error, ?RC_RETAIN_NOT_SUPPORTED};
+do_check_pub(Props, [{max_topic_alias, _} | Caps]) ->
+    do_check_pub(Props, Caps);
 do_check_pub(Props, [{mqtt_retain_available, _}|Caps]) ->
     do_check_pub(Props, Caps).
 
@@ -136,4 +145,3 @@ with_env(Zone, Key, InitFun) ->
                      Caps;
         ZoneCaps  -> ZoneCaps
     end.
-

src/emqx_packet.erl

@@ -75,6 +75,8 @@ validate_properties(?SUBSCRIBE, #{'Subscription-Identifier' := I})
 validate_properties(?PUBLISH, #{'Topic-Alias':= I})
     when I =:= 0 ->
     error(topic_alias_invalid);
+validate_properties(?PUBLISH, #{'Subscription-Identifier' := _I}) ->
+    error(protocol_error);
 validate_properties(_, _) ->
     true.
 
@@ -236,4 +238,3 @@ format_password(_Password) -> '******'.
 i(true)  -> 1;
 i(false) -> 0;
 i(I) when is_integer(I) -> I.
-

src/emqx_protocol.erl

@@ -315,9 +315,12 @@ process_packet(Packet = ?PUBLISH_PACKET(?QOS_0, Topic, _PacketId, _Payload), PSt
     case check_publish(Packet, PState) of
         {ok, PState1} ->
             do_publish(Packet, PState1);
+        {error, ?RC_TOPIC_ALIAS_INVALID} ->
+            ?LOG(error, "Protocol error - ~p", [?RC_TOPIC_ALIAS_INVALID], PState),
+            {error, ?RC_TOPIC_ALIAS_INVALID, PState};
         {error, ReasonCode} ->
             ?LOG(warning, "Cannot publish qos0 message to ~s for ~s", [Topic, ReasonCode], PState),
-            {ok, PState}
+            {error, ReasonCode, PState}
     end;
 
 process_packet(Packet = ?PUBLISH_PACKET(?QOS_1, PacketId), PState) ->
@@ -644,9 +647,11 @@ check_publish(Packet, PState) ->
     run_check_steps([fun check_pub_caps/2,
                      fun check_pub_acl/2], Packet, PState).
 
-check_pub_caps(#mqtt_packet{header = #mqtt_packet_header{qos = QoS, retain = R}},
+check_pub_caps(#mqtt_packet{header = #mqtt_packet_header{qos = QoS, retain = Retain},
+                            variable = #mqtt_packet_publish{ properties = Properties}},
                #pstate{zone = Zone}) ->
-    emqx_mqtt_caps:check_pub(Zone, #{qos => QoS, retain => R}).
+    #{'Topic-Alias' := TopicAlias} = Properties,
+    emqx_mqtt_caps:check_pub(Zone, #{qos => QoS, retain => Retain, topic_alias => TopicAlias}).
 
 check_pub_acl(_Packet, #pstate{is_super = IsSuper, enable_acl = EnableAcl})
     when IsSuper orelse (not EnableAcl) ->

test/emqx_mqtt_caps_SUITE.erl

@@ -64,10 +64,12 @@ t_check_pub(_) ->
     {ok, _} = emqx_zone:start_link(),
     PubCaps = #{
         max_qos_allowed => ?QOS_1,
-        mqtt_retain_available => false
+        mqtt_retain_available => false,
+        max_topic_alias => 4
     },
     emqx_zone:set_env(zone, '$mqtt_pub_caps', PubCaps),
     timer:sleep(100),
+    ct:log("~p", [emqx_mqtt_caps:get_caps(zone, publish)]),
     BadPubProps1 = #{
         qos => ?QOS_2,
         retain => false
@@ -78,6 +80,12 @@ t_check_pub(_) ->
         retain => true
     },
     {error, ?RC_RETAIN_NOT_SUPPORTED} = emqx_mqtt_caps:check_pub(zone, BadPubProps2),
+    BadPubProps3 = #{
+        qos => ?QOS_1,
+        retain => false,
+        topic_alias => 5
+    },
+    {error, ?RC_TOPIC_ALIAS_INVALID} = emqx_mqtt_caps:check_pub(zone, BadPubProps3),
     PubProps = #{
         qos => ?QOS_1,
         retain => false
@@ -104,6 +112,7 @@ t_check_sub(_) ->
     ok = do_check_sub(Caps#{mqtt_shared_subscription => false},
                         [{<<"client/stat">>, Opts}],
                         [{<<"client/stat">>, Opts#{rc => ?RC_SHARED_SUBSCRIPTIONS_NOT_SUPPORTED}}]),
+
     ok = do_check_sub(Caps#{mqtt_wildcard_subscription => false}, 
                         [{<<"vlient/+/dsofi">>, Opts}], 
                         [{<<"vlient/+/dsofi">>, Opts#{rc => ?RC_WILDCARD_SUBSCRIPTIONS_NOT_SUPPORTED}}]),
@@ -111,7 +120,6 @@ t_check_sub(_) ->
 
 
 
-
 do_check_sub(TopicFilters, Topics) ->
     {ok, Topics} = emqx_mqtt_caps:check_sub(zone, TopicFilters),
     ok.