[feature] Add experimental `instance-federation-spam-filter` option (#2685)

* [chore] Move `visibility` to `filter/visibility`

* [feature] Add experimental instance-federation-spam-filter option

1 files changed, 37 insertions, 0 deletions

diff --git a/internal/filter/visibility/filter.go b/internal/filter/visibility/filter.go
new file mode 100644
index 000000000..c9f007ccf
--- /dev/null
+++ b/internal/filter/visibility/filter.go
@@ -0,0 +1,37 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package visibility
+
+import (
+	"github.com/superseriousbusiness/gotosocial/internal/state"
+)
+
+// noauth is a placeholder ID used in cache lookups
+// when there is no authorized account ID to use.
+const noauth = "noauth"
+
+// Filter packages up a bunch of logic for checking whether
+// given statuses or accounts are visible to a requester.
+type Filter struct {
+	state *state.State
+}
+
+// NewFilter returns a new Filter interface that will use the provided database.
+func NewFilter(state *state.State) *Filter {
+	return &Filter{state: state}
+}