增加允许跨域调用API功能 (#279)

api.py

@@ -11,12 +11,14 @@ import pydantic
 import uvicorn
 from fastapi import Body, FastAPI, File, Form, Query, UploadFile, WebSocket
 from fastapi.openapi.utils import get_openapi
+from fastapi.middleware.cors import CORSMiddleware
 from pydantic import BaseModel
 from typing_extensions import Annotated
 from starlette.responses import RedirectResponse
 from chains.local_doc_qa import LocalDocQA
-from configs.model_config import (VS_ROOT_PATH, EMBEDDING_DEVICE, EMBEDDING_MODEL, LLM_MODEL, UPLOAD_ROOT_PATH,
+from configs.model_config import (API_UPLOAD_ROOT_PATH, EMBEDDING_DEVICE,
-                                  NLTK_DATA_PATH, VECTOR_SEARCH_TOP_K, LLM_HISTORY_LEN)
+                                  EMBEDDING_MODEL, LLM_MODEL, NLTK_DATA_PATH,
+                                  VECTOR_SEARCH_TOP_K, LLM_HISTORY_LEN, OPEN_CROSS_DOMAIN)
 
 nltk.data.path = [NLTK_DATA_PATH] + nltk.data.path
 
@@ -310,6 +312,17 @@ def main():
     args = parser.parse_args()
 
     app = FastAPI()
+    # Add CORS middleware to allow all origins
+    # 在config.py中设置OPEN_DOMAIN=True，允许跨域
+    # set OPEN_DOMAIN=True in config.py to allow cross-domain
+    if OPEN_CROSS_DOMAIN:
+        app.add_middleware(
+            CORSMiddleware,
+            allow_origins=["*"],
+            allow_credentials=True,
+            allow_methods=["*"],
+            allow_headers=["*"],
+    )
     app.websocket("/chat-docs/stream-chat/{knowledge_base_id}")(stream_chat)
     app.post("/chat-docs/chat", response_model=ChatMessage)(chat)
     app.post("/chat-docs/chatno", response_model=ChatMessage)(no_knowledge_chat)

configs/model_config.py

@@ -83,3 +83,7 @@ embedding device: {EMBEDDING_DEVICE}
 dir: {os.path.dirname(os.path.dirname(__file__))}
 flagging username: {FLAG_USER_NAME}
 """)
+
+# 是否开启跨域，默认为False，如果需要开启，请设置为True
+# is open cross domain
+OPEN_CROSS_DOMAIN = False