feat(link_ai_bot.py): add support for creating images using OpenAI's DALL-E API

bot/linkai/link_ai_bot.py

@@ -7,14 +7,15 @@ import requests
 
 from bot.bot import Bot
 from bot.chatgpt.chat_gpt_session import ChatGPTSession
+from bot.openai.open_ai_image import OpenAIImage
 from bot.session_manager import SessionManager
-from bridge.context import Context
+from bridge.context import Context, ContextType
 from bridge.reply import Reply, ReplyType
 from common.log import logger
 from config import conf
 
 
-class LinkAIBot(Bot):
+class LinkAIBot(Bot, OpenAIImage):
     # authentication failed
     AUTH_FAILED_CODE = 401
     NO_QUOTA_CODE = 406
@@ -24,7 +25,19 @@ class LinkAIBot(Bot):
         self.sessions = SessionManager(ChatGPTSession, model=conf().get("model") or "gpt-3.5-turbo")
 
     def reply(self, query, context: Context = None) -> Reply:
-        return self._chat(query, context)
+        if context.type == ContextType.TEXT:
+            return self._chat(query, context)
+        elif context.type == ContextType.IMAGE_CREATE:
+            ok, retstring = self.create_img(query, 0)
+            reply = None
+            if ok:
+                reply = Reply(ReplyType.IMAGE_URL, retstring)
+            else:
+                reply = Reply(ReplyType.ERROR, retstring)
+            return reply
+        else:
+            reply = Reply(ReplyType.ERROR, "Bot不支持处理{}类型的消息".format(context.type))
+            return reply
 
     def _chat(self, query, context, retry_count=0):
         if retry_count >= 2: