+type ActivityPubCollectionPaginationHandler = (start: number, count: number) => Bluebird<ResultList<any>> | Promise<ResultList<any>>
+async function activityPubCollectionPagination (baseUrl: string, handler: ActivityPubCollectionPaginationHandler, page?: any) {
+ if (!page || !validator.isInt(page)) {
+ // We just display the first page URL, we only need the total items
+ const result = await handler(0, 1)
+
+ return {
+ id: baseUrl,
+ type: 'OrderedCollection',
+ totalItems: result.total,
+ first: baseUrl + '?page=1'
+ }
+ }
+
+ const { start, count } = pageToStartAndCount(page, ACTIVITY_PUB.COLLECTION_ITEMS_PER_PAGE)
+ const result = await handler(start, count)
+
+ let next: string | undefined
+ let prev: string | undefined