fix: use request-based base url for shareable links

apps/kitchen_mate/Dockerfile

@@ -68,4 +68,4 @@ ENV STORAGE_LOCAL_PATH=/data/uploads
 EXPOSE $PORT
 
 # Run migrations and start the application (shell form to expand $PORT)
-CMD uv run alembic upgrade head && uv run uvicorn kitchen_mate.main:app --host 0.0.0.0 --port $PORT
+CMD uv run alembic upgrade head && uv run uvicorn kitchen_mate.main:app --host 0.0.0.0 --port $PORT --proxy-headers --forwarded-allow-ips="*"

apps/kitchen_mate/src/kitchen_mate/config.py

@@ -79,9 +79,6 @@ class Settings(BaseSettings):
     # CORS configuration
     cors_origins: str = "http://localhost:5173"
 
-    # Base URL for constructing shareable links
-    app_base_url: str = "http://localhost:5173"
-
     # Database configuration
     cache_db_path: str = "kitchenmate.db"
     cache_enabled: bool = True

apps/kitchen_mate/src/kitchen_mate/routes/sharing.py

@@ -4,10 +4,9 @@
 
 from typing import Annotated
 
-from fastapi import APIRouter, Depends, HTTPException
+from fastapi import APIRouter, Depends, HTTPException, Request
 
 from kitchen_mate.auth import User, get_user
-from kitchen_mate.config import Settings, get_settings
 from kitchen_mate.database.repositories import (
     create_or_get_share,
     get_share_by_token,
@@ -17,22 +16,24 @@
 )
 from kitchen_mate.schemas import CreateShareResponse, SaveSharedRecipeResponse, SharedRecipeResponse
 
+
 router = APIRouter()
 
 
 @router.post("/me/recipes/{recipe_id}/share", response_model=CreateShareResponse)
 async def create_share(
     recipe_id: str,
+    request: Request,
     user: Annotated[User, Depends(get_user)],
-    settings: Annotated[Settings, Depends(get_settings)],
 ) -> CreateShareResponse:
     """Generate a shareable link for a recipe."""
     try:
         share = await create_or_get_share(user.id, recipe_id)
     except ValueError:
         raise HTTPException(status_code=404, detail="Recipe not found")
 
-    share_url = f"{settings.app_base_url}/shared/{share.share_token}"
+    base_url = f"{request.url.scheme}://{request.url.netloc}"
+    share_url = f"{base_url}/shared/{share.share_token}"
     return CreateShareResponse(
         share_token=share.share_token,
         share_url=share_url,