feat: 修改drawing 为django 接口

backend/ai/llm/__init__.py

@@ -0,0 +1,50 @@
+import os
+from enum import Enum
+
+from pydantic import SecretStr
+
+
+class ProviderEnum(str, Enum):
+    """支持的 LLM 服务商"""
+    DEEPSEEK = "deepseek"
+    OPENAI = "openai"
+    TONGYI = "tongyi"
+
+class LLMFactory(object):
+
+    @staticmethod
+    def get_llm(provider: ProviderEnum, model: str = None, **kwargs):
+        if provider == ProviderEnum.DEEPSEEK:
+            from langchain_deepseek import ChatDeepSeek
+            api_key = os.getenv("DEEPSEEK_API_KEY")
+            model = model or "deepseek-chat"
+            return ChatDeepSeek(
+                api_key=SecretStr(api_key),
+                model=model,
+                streaming=True,
+                **kwargs
+            )
+
+        elif provider == ProviderEnum.OPENAI:
+            from langchain_openai import ChatOpenAI
+            api_key = os.getenv("OPENAI_API_KEY")
+            model = model or "gpt-3.5-turbo"
+            return ChatOpenAI(
+                api_key=SecretStr(api_key),
+                model=model,
+                streaming=True,
+                **kwargs
+            )
+
+        elif provider == ProviderEnum.TONGYI:
+            from langchain_community.llms import Tongyi
+            api_key = os.getenv("DASHSCOPE_API_KEY")
+            model = model or "qwen-turbo"
+            return Tongyi(
+                api_key=SecretStr(api_key),
+                model=model,
+                streaming=True,
+                **kwargs
+            )
+        else:
+            raise ValueError(f"不支持的 LLM 服务商: {provider}")