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import {
AppBskyFeedDefs,
AppBskyFeedGetAuthorFeed as GetAuthorFeed,
} from '@atproto/api'
import {getAgent} from '#/state/session'
import {FeedAPI, FeedAPIResponse} from './types'
export class AuthorFeedAPI implements FeedAPI {
constructor(public params: GetAuthorFeed.QueryParams) {}
async peekLatest(): Promise<AppBskyFeedDefs.FeedViewPost> {
const res = await getAgent().getAuthorFeed({
...this.params,
limit: 1,
})
return res.data.feed[0]
}
async fetch({
cursor,
limit,
}: {
cursor: string | undefined
limit: number
}): Promise<FeedAPIResponse> {
const res = await getAgent().getAuthorFeed({
...this.params,
cursor,
limit,
})
if (res.success) {
return {
cursor: res.data.cursor,
feed: this._filter(res.data.feed),
}
}
return {
feed: [],
}
}
_filter(feed: AppBskyFeedDefs.FeedViewPost[]) {
if (this.params.filter === 'posts_and_author_threads') {
return feed.filter(post => {
const isReply = post.reply
const isRepost = AppBskyFeedDefs.isReasonRepost(post.reason)
if (!isReply) return true
if (isRepost) return true
return isReply && isAuthorReplyChain(this.params.actor, post, feed)
})
}
return feed
}
}
function isAuthorReplyChain(
actor: string,
post: AppBskyFeedDefs.FeedViewPost,
posts: AppBskyFeedDefs.FeedViewPost[],
): boolean {
// current post is by a different user (shouldn't happen)
if (post.post.author.did !== actor) return false
const replyParent = post.reply?.parent
if (AppBskyFeedDefs.isPostView(replyParent)) {
// reply parent is by a different user
if (replyParent.author.did !== actor) return false
// A top-level post that matches the parent of the current post.
const parentPost = posts.find(p => p.post.uri === replyParent.uri)
/*
* Either we haven't fetched the parent at the top level, or the only
* record we have is on feedItem.reply.parent, which we've already checked
* above.
*/
if (!parentPost) return true
// Walk up to parent
return isAuthorReplyChain(actor, parentPost, posts)
}
// Just default to showing it
return true
}
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