feat: end-point for bill of payment generation

routers/deal.py

@@ -1,6 +1,7 @@
+from io import BytesIO
 from typing import Annotated
 
-from fastapi import APIRouter, Depends
+from fastapi import APIRouter, Depends, Response
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from backend.dependecies import SessionDependency, CurrentUserDependency
@@ -8,6 +9,7 @@ from backend.session import get_session
 from models import User
 from schemas.deal import *
 from services.auth import get_current_user, authorized_user, guest_user
+from services.billing import BillingService
 from services.deal import DealService
 
 deal_router = APIRouter(
@@ -162,6 +164,18 @@ async def create_guest_url(
     return DealService(session).create_guest_url(user, request)
 
 
+@deal_router.get(
+    '/document/{deal_id}',
+    operation_id='get_deal_document',
+    # dependencies=[Depends(authorized_user)],
+)
+async def get_deal_document(
+        deal_id: int,
+        session: Annotated[AsyncSession, Depends(get_session)],
+):
+    pdf_file: BytesIO = await BillingService(session).create_billing_document_pdf(deal_id)
+    return Response(pdf_file.getvalue(), media_type='application/pdf')
+
 # endregion
 
 # region Deal services