🚧 basically completed event serialize

nonebot/adapters/mirai/event/message.py

@@ -0,0 +1,40 @@
+from typing import TYPE_CHECKING
+
+from pydantic import Field
+from .base import Event, SenderInfo, PrivateSenderInfo
+
+from ..message import MessageChain
+from nonebot.typing import overrides
+
+
+class MessageEvent(Event):
+    message_chain: MessageChain = Field(alias='messageChain')
+    sender: SenderInfo
+
+    @overrides(Event)
+    def get_message(self) -> MessageChain:
+        return self.message_chain
+
+    @overrides(Event)
+    def get_plaintext(self) -> str:
+        return self.message_chain.__str__()
+
+    @overrides(Event)
+    def get_user_id(self) -> str:
+        return str(self.sender.id)
+
+    @overrides(Event)
+    def get_session_id(self) -> str:
+        return self.get_user_id()
+
+
+class GroupMessage(MessageEvent):
+    pass
+
+
+class FriendMessage(MessageEvent):
+    sender: PrivateSenderInfo
+
+
+class TempMessage(MessageEvent):
+    pass