feat: Add root path options

app/webapp.py

@@ -1,7 +1,7 @@
 from datetime import datetime
 from typing import Annotated
 
-from fastapi import FastAPI
+from fastapi import FastAPI, Request
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.params import Depends
 from fastapi.staticfiles import StaticFiles
@@ -34,16 +34,18 @@
 
 
 @app.get("/", description="Default portal. Test for server availability.")
-def welcome(token_passed: Annotated[bool, Depends(permissive_access_token_verify)],
+def welcome(request: Request,
+            token_passed: Annotated[bool, Depends(permissive_access_token_verify)],
             admin_token_passed: Annotated[bool, Depends(permissive_admin_token_verify)],
             ) -> WelcomeApiResponse:
+    root_path: str = request.scope.get('root_path').rstrip('/')
     return WelcomeApiResponse(
         message="Ciallo~ Welcome to NekoImageGallery API!",
         server_time=datetime.now(),
         wiki={
-            "openAPI": "/openapi.json",
-            "swagger UI": "/docs",
-            "redoc": "/redoc"
+            "openAPI": f"{root_path}/openapi.json",
+            "swagger UI": f"{root_path}/docs",
+            "redoc": f"{root_path}/redoc"
         },
         admin_api=WelcomeApiAdminPortalAuthenticationResponse(available=config.admin_api_enable,
                                                               passed=admin_token_passed),

main.py

@@ -22,6 +22,11 @@ def parse_args():
                              'is set, will not start the server.')
     parser.add_argument('--port', type=int, default=8000, help="Port to listen on, default is 8000")
     parser.add_argument('--host', type=str, default="0.0.0.0", help="Host to bind on, default is 0.0.0.0")
+    parser.add_argument('--root-path', type=str, default="",
+                        help="Root path of the server if your server is deployed behind a reverse proxy. "
+                             "See https://fastapi.tiangolo.com/advanced/behind-a-proxy/ for detail.")
+
+    parser.add_argument('--version', action='version', version='%(prog)s 1.0.0')
     return parser.parse_args()
 
 
@@ -48,4 +53,4 @@ def parse_args():
 
         asyncio.run(local_create_thumbnail.main())
     else:
-        uvicorn.run("app.webapp:app", host=args.host, port=args.port)
+        uvicorn.run("app.webapp:app", host=args.host, port=args.port, root_path=args.root_path)