feat: add offline swagger docs (#7653)

litellm/proxy/proxy_server.py

@@ -348,10 +348,12 @@ from fastapi import (
     Response,
     UploadFile,
     status,
+    applications
 )
 from fastapi.encoders import jsonable_encoder
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.openapi.utils import get_openapi
+from fastapi.openapi.docs import get_swagger_ui_html
 from fastapi.responses import (
     FileResponse,
     JSONResponse,
@@ -749,6 +751,18 @@ app.add_middleware(
 
 app.add_middleware(PrometheusAuthMiddleware)
 
+swagger_path = os.path.join(current_dir, "swagger")
+app.mount("/swagger", StaticFiles(directory=swagger_path), name="swagger")
+def swagger_monkey_patch(*args, **kwargs):
+    return get_swagger_ui_html(
+        *args,
+        **kwargs,
+        swagger_js_url="/swagger/swagger-ui-bundle.js",
+        swagger_css_url="/swagger/swagger-ui.css",
+        swagger_favicon_url="/swagger/favicon.png"
+    )
+applications.get_swagger_ui_html = swagger_monkey_patch
+
 from typing import Dict
 
 user_api_base = None