resolves Yakifo/amqtt#250 : * was being blocked as a valid topic character in publish/receive, even though the invalid topic wildcard characters are '#' and '+'. also, add test coverage for error cases when creating different packet types.

amqtt/mqtt/protocol/handler.py

@@ -520,8 +520,9 @@ class ProtocolHandler(Generic[C]):
                 elif packet.fixed_header.packet_type == DISCONNECT and isinstance(packet, DisconnectPacket):
                     task = asyncio.create_task(self.handle_disconnect(packet))
                 elif packet.fixed_header.packet_type == CONNECT and isinstance(packet, ConnectPacket):
-                    # TODO: why is this not like all other inside create_task?
-                    await self.handle_connect(packet)  # task = asyncio.create_task(self.handle_connect(packet))
+                    # q: why is this not like all other inside a create_task?
+                    # a: the connection needs to be established before any other packet tasks for this new session are scheduled
+                    await self.handle_connect(packet)
                 if task:
                     running_tasks.append(task)
             except MQTTError:

amqtt/mqtt/publish.py

@@ -12,7 +12,7 @@ class PublishVariableHeader(MQTTVariableHeader):
 
     def __init__(self, topic_name: str, packet_id: int | None = None) -> None:
         super().__init__()
-        if "*" in topic_name:
+        if "#" in topic_name or "+" in topic_name:
             msg = "[MQTT-3.3.2-2] Topic name in the PUBLISH Packet MUST NOT contain wildcard characters."
             raise MQTTError(msg)
         self.topic_name = topic_name

tests/mqtt/test_connack.py

@@ -0,0 +1,25 @@
+import pytest
+from amqtt.errors import AMQTTError
+from amqtt.mqtt.connack import ConnackPacket
+from amqtt.mqtt.packet import MQTTFixedHeader, PUBLISH
+
+
+
+def test_incorrect_fixed_header():
+    header = MQTTFixedHeader(PUBLISH, 0x00)
+    with pytest.raises(AMQTTError):
+        _ = ConnackPacket(fixed=header)
+
+
+@pytest.mark.parametrize("prop", [
+    "return_code",
+    "session_parent"
+])
+def test_empty_variable_header(prop):
+    packet = ConnackPacket()
+
+    with pytest.raises(ValueError):
+        assert getattr(packet, prop) is not None
+
+    with pytest.raises(ValueError):
+        assert setattr(packet, prop, "a value")

tests/mqtt/test_connect.py

@@ -153,10 +153,10 @@ class ConnectPacketTest(unittest.TestCase):
         assert message.payload.password == "password"
         assert message.password == "password"
 
-    def test_incorrect_fixed_header(self):
+def test_incorrect_fixed_header():
     header = MQTTFixedHeader(PUBLISH, 0x00)
     with pytest.raises(AMQTTError):
-            connect_packet = ConnectPacket(fixed=header)
+        _ = ConnectPacket(fixed=header)
 
 @pytest.mark.parametrize("prop", [
     "proto_name",
@@ -177,11 +177,11 @@ class ConnectPacketTest(unittest.TestCase):
     "keep_alive",
 ])
 def test_empty_variable_header(prop):
-    connect_packet = ConnectPacket()
+    packet = ConnectPacket()
 
     with pytest.raises(ValueError):
-        assert getattr(connect_packet, prop) is not None
+        assert getattr(packet, prop) is not None
 
     with pytest.raises(ValueError):
-        assert setattr(connect_packet, prop, "a value")
+        assert setattr(packet, prop, "a value")
 

tests/mqtt/test_puback.py

@@ -1,7 +1,10 @@
 import asyncio
 import unittest
+import pytest
 
 from amqtt.adapters import BufferReader
+from amqtt.errors import AMQTTError
+from amqtt.mqtt import PUBLISH, MQTTFixedHeader
 from amqtt.mqtt.puback import PacketIdVariableHeader, PubackPacket
 
 
@@ -20,3 +23,22 @@ class PubackPacketTest(unittest.TestCase):
         publish = PubackPacket(variable_header=variable_header)
         out = publish.to_bytes()
         assert out == b"@\x02\x00\n"
+
+
+def test_incorrect_fixed_header():
+    header = MQTTFixedHeader(PUBLISH, 0x00)
+    with pytest.raises(AMQTTError):
+        connect_packet = PubackPacket(fixed=header)
+
+
+@pytest.mark.parametrize("prop", [
+    "packet_id",
+])
+def test_empty_variable_header(prop):
+    connect_packet = PubackPacket()
+
+    with pytest.raises(ValueError):
+        assert getattr(connect_packet, prop) is not None
+
+    with pytest.raises(ValueError):
+        assert setattr(connect_packet, prop, "a value")

tests/mqtt/test_pubcomp.py

@@ -1,7 +1,10 @@
 import asyncio
 import unittest
+import pytest
 
 from amqtt.adapters import BufferReader
+from amqtt.errors import AMQTTError
+from amqtt.mqtt import MQTTFixedHeader, PUBLISH
 from amqtt.mqtt.pubcomp import PacketIdVariableHeader, PubcompPacket
 
 
@@ -20,3 +23,21 @@ class PubcompPacketTest(unittest.TestCase):
         publish = PubcompPacket(variable_header=variable_header)
         out = publish.to_bytes()
         assert out == b"p\x02\x00\n"
+
+def test_incorrect_fixed_header():
+    header = MQTTFixedHeader(PUBLISH, 0x00)
+    with pytest.raises(AMQTTError):
+        _ = PubcompPacket(fixed=header)
+
+
+@pytest.mark.parametrize("prop", [
+    "packet_id"
+])
+def test_empty_variable_header(prop):
+    packet = PubcompPacket()
+
+    with pytest.raises(ValueError):
+        assert getattr(packet, prop) is not None
+
+    with pytest.raises(ValueError):
+        assert setattr(packet, prop, "a value")

tests/mqtt/test_publish.py

@@ -1,7 +1,10 @@
 import asyncio
 import unittest
+import pytest
 
 from amqtt.adapters import BufferReader
+from amqtt.errors import AMQTTError
+from amqtt.mqtt.packet import MQTTFixedHeader, CONNECT
 from amqtt.mqtt.constants import QOS_0, QOS_1, QOS_2
 from amqtt.mqtt.publish import PublishPacket, PublishPayload, PublishVariableHeader
 
@@ -116,3 +119,28 @@ class PublishPacketTest(unittest.TestCase):
         assert packet.dup_flag
         assert packet.qos == QOS_2
         assert packet.retain_flag
+
+
+def test_incorrect_fixed_header():
+    header = MQTTFixedHeader(CONNECT, 0x00)
+    with pytest.raises(AMQTTError):
+        _ = PublishPacket(fixed=header)
+
+def test_set_flags():
+    packet = PublishPacket()
+    packet.set_flags(dup_flag=True, qos=QOS_1, retain_flag=True)
+
+
+@pytest.mark.parametrize("prop", [
+    "packet_id",
+    "data",
+    "topic_name"
+])
+def test_empty_variable_header(prop):
+    packet = PublishPacket()
+
+    with pytest.raises(ValueError):
+        assert getattr(packet, prop) is not None
+
+    with pytest.raises(ValueError):
+        assert setattr(packet, prop, "a value")

tests/mqtt/test_pubrec.py

@@ -1,7 +1,10 @@
 import asyncio
 import unittest
+import pytest
 
 from amqtt.adapters import BufferReader
+from amqtt.errors import AMQTTError
+from amqtt.mqtt.packet import MQTTFixedHeader, PUBLISH
 from amqtt.mqtt.pubrec import PacketIdVariableHeader, PubrecPacket
 
 
@@ -20,3 +23,22 @@ class PubrecPacketTest(unittest.TestCase):
         publish = PubrecPacket(variable_header=variable_header)
         out = publish.to_bytes()
         assert out == b"P\x02\x00\n"
+
+
+def test_incorrect_fixed_header():
+    header = MQTTFixedHeader(PUBLISH, 0x00)
+    with pytest.raises(AMQTTError):
+        _ = PubrecPacket(fixed=header)
+
+
+@pytest.mark.parametrize("prop", [
+    "packet_id"
+])
+def test_empty_variable_header(prop):
+    packet = PubrecPacket()
+
+    with pytest.raises(ValueError):
+        assert getattr(packet, prop) is not None
+
+    with pytest.raises(ValueError):
+        assert setattr(packet, prop, "a value")

tests/mqtt/test_pubrel.py

@@ -1,7 +1,10 @@
 import asyncio
 import unittest
+import pytest
 
 from amqtt.adapters import BufferReader
+from amqtt.errors import AMQTTError
+from amqtt.mqtt.packet import MQTTFixedHeader, PUBLISH
 from amqtt.mqtt.pubrel import PacketIdVariableHeader, PubrelPacket
 
 
@@ -20,3 +23,22 @@ class PubrelPacketTest(unittest.TestCase):
         publish = PubrelPacket(variable_header=variable_header)
         out = publish.to_bytes()
         assert out == b"b\x02\x00\n"
+
+
+def test_incorrect_fixed_header():
+    header = MQTTFixedHeader(PUBLISH, 0x00)
+    with pytest.raises(AMQTTError):
+        _  = PubrelPacket(fixed=header)
+
+
+@pytest.mark.parametrize("prop", [
+    "packet_id"
+])
+def test_empty_variable_header(prop):
+    packet = PubrelPacket()
+
+    with pytest.raises(ValueError):
+        assert getattr(packet, prop) is not None
+
+    with pytest.raises(ValueError):
+        assert setattr(packet, prop, "a value")

tests/test_broker.py

@@ -468,17 +468,62 @@ async def test_client_publish_dup(broker):
 
 
 @pytest.mark.asyncio
-async def test_client_publish_invalid_topic(broker):
+async def test_client_publishing_invalid_topic(broker):
     assert broker.transitions.is_started()
-    pub_client = MQTTClient()
+    pub_client = MQTTClient(config={'auto_reconnect': False})
     ret = await pub_client.connect("mqtt://127.0.0.1/")
     assert ret == 0
 
-    await pub_client.publish("/+", b"data", QOS_0)
+    await pub_client.subscribe([
+        ("my/+/topic", QOS_0)
+    ])
+    await asyncio.sleep(0.5)
+
+    # need to build & send packet directly to bypass client's check of invalid topic name
+    #    see test_client.py::test_publish_to_incorrect_wildcard for client checks
+    packet = PublishPacket.build(topic_name='my/topic', message=b'messages',
+                                 packet_id=None, dup_flag=False, qos=QOS_0, retain=False)
+    packet.topic_name = "my/+/topic"
+    await pub_client._handler._send_packet(packet)
+    await asyncio.sleep(0.5)
+
+    with pytest.raises(asyncio.TimeoutError):
+        msg = await pub_client.deliver_message(timeout_duration=1)
+        assert msg is None
+
     await asyncio.sleep(0.1)
     await pub_client.disconnect()
 
 
+@pytest.mark.asyncio
+async def test_client_publish_asterisk(broker):
+    """'*' is a valid, non-wildcard character for MQTT."""
+    assert broker.transitions.is_started()
+    pub_client = MQTTClient(config={'auto_reconnect': False})
+    ret = await pub_client.connect("mqtt://127.0.0.1/")
+    assert ret == 0
+
+    await pub_client.subscribe([
+        ("my*/topic", QOS_0),
+        ("my/+/topic", QOS_0)
+    ])
+    await asyncio.sleep(0.1)
+    await pub_client.publish('my*/topic', b'my valid message', QOS_0, retain=False)
+    await asyncio.sleep(0.1)
+    msg = await pub_client.deliver_message(timeout_duration=1)
+    assert msg is not None
+    assert msg.topic == "my*/topic"
+    assert msg.data == b'my valid message'
+
+    await asyncio.sleep(0.1)
+    msg = await pub_client.publish('my/****/topic', b'my valid message', QOS_0, retain=False)
+    assert msg is not None
+    assert msg.topic == "my/****/topic"
+    assert msg.data == b'my valid message'
+
+    await pub_client.disconnect()
+
+
 @pytest.mark.asyncio
 async def test_client_publish_big(broker, mock_plugin_manager):
     pub_client = MQTTClient()

tests/test_client.py

@@ -7,7 +7,7 @@ import pytest
 
 from amqtt.broker import Broker
 from amqtt.client import MQTTClient
-from amqtt.errors import ClientError, ConnectError
+from amqtt.errors import ClientError, ConnectError, MQTTError
 from amqtt.mqtt.constants import QOS_0, QOS_1, QOS_2
 
 formatter = "[%(asctime)s] %(name)s {%(filename)s:%(lineno)d} %(levelname)s - %(message)s"
@@ -490,3 +490,17 @@ async def test_client_no_auth():
             await client.connect("mqtt://127.0.0.1:1883/")
 
         await broker.shutdown()
+
+
+@pytest.mark.asyncio
+async def test_publish_to_incorrect_wildcard(broker_fixture):
+    client = MQTTClient(config={'auto_reconnect': False})
+    await client.connect("mqtt://127.0.0.1/")
+
+    with pytest.raises(MQTTError):
+        await client.publish("my/+/topic", b'start wildcard topic publish')
+    with pytest.raises(MQTTError):
+        await client.publish("topic/#", b'hash wildcard topic publish')
+
+    await client.publish("topic/*", b'start wildcard topic publish')
+    await client.disconnect()