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import Bluebird from 'bluebird'
import validator from 'validator'
import { pageToStartAndCount } from '@server/helpers/core-utils'
import { ACTIVITY_PUB } from '@server/initializers/constants'
import { ResultList } from '@shared/models'
import { forceNumber } from '@shared/core-utils'
type ActivityPubCollectionPaginationHandler = (start: number, count: number) => Bluebird<ResultList<any>> | Promise<ResultList<any>>
async function activityPubCollectionPagination (
baseUrl: string,
handler: ActivityPubCollectionPaginationHandler,
page?: any,
size = ACTIVITY_PUB.COLLECTION_ITEMS_PER_PAGE
) {
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: result.data.length === 0
? undefined
: baseUrl + '?page=1'
}
}
const { start, count } = pageToStartAndCount(page, size)
const result = await handler(start, count)
let next: string | undefined
let prev: string | undefined
// Assert page is a number
page = forceNumber(page)
// There are more results
if (result.total > page * size) {
next = baseUrl + '?page=' + (page + 1)
}
if (page > 1) {
prev = baseUrl + '?page=' + (page - 1)
}
return {
id: baseUrl + '?page=' + page,
type: 'OrderedCollectionPage',
prev,
next,
partOf: baseUrl,
orderedItems: result.data,
totalItems: result.total
}
}
// ---------------------------------------------------------------------------
export {
activityPubCollectionPagination
}
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