Cherry pick of a06d506 (#35172) into release-10.11 (#35332)

Automatic Merge

server/public/utils/page.go

@@ -0,0 +1,43 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package utils
+
+// Pager fetches all items from a paginated API.
+// Pager is a generic function that fetches and aggregates paginated data.
+// It takes a fetch function and a perPage parameter as arguments.
+//
+// The fetch function is responsible for retrieving a slice of items of type T
+// for a given page number. It returns the fetched items and an error, if any.
+// Ideally a developer may want to use a closure to create a fetch function.
+//
+// The perPage parameter specifies the number of items to fetch per page.
+//
+// Example usage:
+//
+//	items, err := Pager(fetchFunc, 10)
+//	if err != nil {
+//	    // handle error
+//	}
+//	// process items
+func Pager[T any](fetch func(page int) ([]T, error), perPage int) ([]T, error) {
+	var list []T
+	var page int
+
+	for {
+		fetched, err := fetch(page)
+		if err != nil {
+			return list, err
+		}
+
+		list = append(list, fetched...)
+
+		if len(fetched) < perPage {
+			break
+		}
+
+		page++
+	}
+
+	return list, nil
+}