Method filterUserGrantsForCaller

internal/server/server.go:2693–2743

filterUserGrantsForCaller narrows collGrants/itemGrants — the TARGET user's grants, already loaded by the caller — down to what the CALLER can see. Only meaningful when caller != target; handleListUserGrants skips calling this for self-queries (a user can always see their own grants). BUG-1928: han

(r *http.Request, workspaceID string, collGrants []models.CollectionGrant, itemGrants []models.ItemGrant)

// call (state-agnostic; no deleted_at filter) rather than N per-grant
// lookups.
func (s *Server) filterUserGrantsForCaller(r *http.Request, workspaceID string, collGrants []models.CollectionGrant, itemGrants []models.ItemGrant) ([]models.CollectionGrant, []models.ItemGrant, error) {
	fullCollIDs, grantedItemIDs, err := s.guestResourceFilter(r, workspaceID)
	if err != nil {
		return nil, nil, err
	}
	if fullCollIDs == nil && grantedItemIDs == nil {
		// Unrestricted caller (admin/cookie session, or a member with
		// full collection access) — no filtering, and no further store
		// calls needed.
		return collGrants, itemGrants, nil
	}

	filteredColl := make([]models.CollectionGrant, 0, len(collGrants))
	for _, g := range collGrants {
		if isCollectionVisible(g.CollectionID, fullCollIDs) {
			filteredColl = append(filteredColl, g)
		}
	}

	filteredItem := make([]models.ItemGrant, 0, len(itemGrants))
	if len(itemGrants) > 0 {
		itemIDs := make([]string, len(itemGrants))
		for i, g := range itemGrants {
			itemIDs[i] = g.ItemID
		}
		refs, err := s.store.GetItemCollectionRefs(workspaceID, itemIDs)
		if err != nil {
			return nil, nil, err
		}
		collByItem := make(map[string]string, len(refs))
		for _, ref := range refs {
			collByItem[ref.ID] = ref.CollectionID
		}
		for _, g := range itemGrants {
			collID, ok := collByItem[g.ItemID]
			if !ok {
				// item_grants.item_id is ON DELETE CASCADE, so a grant
				// row can't outlive its item — this should be
				// unreachable. Exclude defensively rather than show a
				// grant with no resolvable parent.
				continue
			}
			item := &models.Item{ID: g.ItemID, CollectionID: collID}
			if s.isItemVisibleToGuest(r, workspaceID, item, fullCollIDs, grantedItemIDs) {
				filteredItem = append(filteredItem, g)
			}
		}
	}

	return filteredColl, filteredItem, nil
}

// requireEditPermission checks if the user has edit access to the given item.
// For regular members (editor/owner), this uses the standard role check.