start adding page validation

internal/cache/timeline/timeline.go

@@ -1,3 +1,20 @@
+// 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 timeline
 
 import (
@@ -5,15 +22,21 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/paging"
 )
 
+// nextPageParams gets the next set of paging
+// parameters to use based on the current set,
+// and the next set of lo / hi values. This will
+// correctly handle making sure that, depending
+// on the paging order, the cursor value gets
+// updated while maintaining the boundary value.
 func nextPageParams(
-	curLo, curHi string, // current page params
-	nextLo, nextHi string, // next lo / hi values
+	curLo, curHi string,
+	nextLo, nextHi string,
 	order paging.Order,
 ) (lo string, hi string) {
 	if order.Ascending() {
-
+		return nextLo, curHi
 	} else /* i.e. descending */ {
-
+		return curLo, nextHi
 	}
 }