feat: rename masq to snat throughout, update generator to Shorewall 5 snat format

backend/app/api/snat.py

@@ -0,0 +1,64 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from app import models, schemas
+from app.auth import get_current_user
+from app.database import get_db
+
+router = APIRouter()
+
+
+def _owner_config(config_id: int, db: Session, user: models.User) -> models.Config:
+    config = db.query(models.Config).filter(
+        models.Config.id == config_id, models.Config.owner_id == user.id
+    ).first()
+    if not config:
+        raise HTTPException(status_code=404, detail="Config not found")
+    return config
+
+
+@router.get("/{config_id}/snat", response_model=list[schemas.SnatOut])
+def list_snat(config_id: int, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
+    _owner_config(config_id, db, user)
+    return db.query(models.Snat).filter(models.Snat.config_id == config_id).all()
+
+
+@router.post("/{config_id}/snat", response_model=schemas.SnatOut, status_code=201)
+def create_snat(config_id: int, body: schemas.SnatCreate, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
+    _owner_config(config_id, db, user)
+    snat = models.Snat(**body.model_dump(), config_id=config_id)
+    db.add(snat)
+    db.commit()
+    db.refresh(snat)
+    return snat
+
+
+@router.get("/{config_id}/snat/{snat_id}", response_model=schemas.SnatOut)
+def get_snat(config_id: int, snat_id: int, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
+    _owner_config(config_id, db, user)
+    snat = db.query(models.Snat).filter(models.Snat.id == snat_id, models.Snat.config_id == config_id).first()
+    if not snat:
+        raise HTTPException(status_code=404, detail="SNAT entry not found")
+    return snat
+
+
+@router.put("/{config_id}/snat/{snat_id}", response_model=schemas.SnatOut)
+def update_snat(config_id: int, snat_id: int, body: schemas.SnatUpdate, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
+    _owner_config(config_id, db, user)
+    snat = db.query(models.Snat).filter(models.Snat.id == snat_id, models.Snat.config_id == config_id).first()
+    if not snat:
+        raise HTTPException(status_code=404, detail="SNAT entry not found")
+    for field, value in body.model_dump(exclude_none=True).items():
+        setattr(snat, field, value)
+    db.commit()
+    db.refresh(snat)
+    return snat
+
+
+@router.delete("/{config_id}/snat/{snat_id}", status_code=204)
+def delete_snat(config_id: int, snat_id: int, db: Session = Depends(get_db), user: models.User = Depends(get_current_user)):
+    _owner_config(config_id, db, user)
+    snat = db.query(models.Snat).filter(models.Snat.id == snat_id, models.Snat.config_id == config_id).first()
+    if not snat:
+        raise HTTPException(status_code=404, detail="SNAT entry not found")
+    db.delete(snat)
+    db.commit()