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import * as Bluebird from 'bluebird'
import { URL } from 'url'
import { ActivityPubOrderedCollection } from '../../../shared/models/activitypub'
import { logger } from '../../helpers/logger'
import { doJSONRequest } from '../../helpers/requests'
import { ACTIVITY_PUB, WEBSERVER } from '../../initializers/constants'
type HandlerFunction<T> = (items: T[]) => (Promise<any> | Bluebird<any>)
type CleanerFunction = (startedDate: Date) => (Promise<any> | Bluebird<any>)
async function crawlCollectionPage <T> (argUrl: string, handler: HandlerFunction<T>, cleaner?: CleanerFunction) {
let url = argUrl
logger.info('Crawling ActivityPub data on %s.', url)
const options = { activityPub: true }
const startDate = new Date()
const response = await doJSONRequest<ActivityPubOrderedCollection<T>>(url, options)
const firstBody = response.body
const limit = ACTIVITY_PUB.FETCH_PAGE_LIMIT
let i = 0
let nextLink = firstBody.first
while (nextLink && i < limit) {
let body: any
if (typeof nextLink === 'string') {
// Don't crawl ourselves
const remoteHost = new URL(nextLink).host
if (remoteHost === WEBSERVER.HOST) continue
url = nextLink
const res = await doJSONRequest<ActivityPubOrderedCollection<T>>(url, options)
body = res.body
} else {
// nextLink is already the object we want
body = nextLink
}
nextLink = body.next
i++
if (Array.isArray(body.orderedItems)) {
const items = body.orderedItems
logger.info('Processing %i ActivityPub items for %s.', items.length, url)
await handler(items)
}
}
if (cleaner) await cleaner(startDate)
}
export {
crawlCollectionPage
}
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