diff --git a/lib/utils/neynar-client.js b/lib/utils/neynar-client.js index 99a47ef4f..18beb8b92 100644 --- a/lib/utils/neynar-client.js +++ b/lib/utils/neynar-client.js @@ -1,94 +1,152 @@ // @flow import invariant from 'invariant'; import { getMessageForException } from './errors.js'; type FarcasterUser = { +fid: number, +viewerContext: { +following: boolean, }, ... }; type FetchFollowersResponse = { +result: { +users: $ReadOnlyArray, +next: { +cursor: ?string, }, }, }; +type FarcasterChannel = { + +id: string, + +name: string, + ... +}; + +type FetchFollowedFarcasterChannelsResponse = { + +channels: $ReadOnlyArray, + +next: { + +cursor: ?string, + }, +}; + const neynarBaseURL = 'https://api.neynar.com/'; const neynarURLs = { '1': `${neynarBaseURL}v1/farcaster/`, + '2': `${neynarBaseURL}v2/farcaster/`, }; function getNeynarURL( apiVersion: string, apiCall: string, params: { [string]: string }, ): string { const neynarURL = neynarURLs[apiVersion]; invariant( neynarURL, `could not find Neynar URL for apiVersion ${apiVersion}`, ); return `${neynarURL}${apiCall}?${new URLSearchParams(params).toString()}`; } const fetchFollowerLimit = 150; +const fetchFollowedChannelsLimit = 100; class NeynarClient { apiKey: string; constructor(apiKey: string) { this.apiKey = apiKey; } // We're using the term "friend" for a bidirectional follow async fetchFriendFIDs(fid: string): Promise { const fids = []; let paginationCursor = null; do { const params: { [string]: string } = { fid, viewerFid: fid, limit: fetchFollowerLimit.toString(), ...(paginationCursor ? { cursor: paginationCursor } : null), }; const url = getNeynarURL('1', 'followers', params); try { const response = await fetch(url, { method: 'GET', headers: { Accept: 'application/json', api_key: this.apiKey, }, }); const json: FetchFollowersResponse = await response.json(); const { users } = json.result; for (const user of users) { if (user.viewerContext.following) { fids.push(user.fid.toString()); } } paginationCursor = json.result.next.cursor; } catch (error) { console.log('Failed to fetch friend FIDs:', error); throw new Error(getMessageForException(error) ?? 'unknown'); } } while (paginationCursor); return fids; } + + async fetchFollowedFarcasterChannels( + fid: string, + ): Promise { + const farcasterChannels = []; + let paginationCursor = null; + + do { + const params: { [string]: string } = { + fid, + limit: fetchFollowedChannelsLimit.toString(), + ...(paginationCursor ? { cursor: paginationCursor } : null), + }; + + const url = getNeynarURL('2', 'user/channels', params); + + try { + const response = await fetch(url, { + method: 'GET', + headers: { + Accept: 'application/json', + api_key: this.apiKey, + }, + }); + + const json: FetchFollowedFarcasterChannelsResponse = + await response.json(); + + const { channels, next } = json; + + channels.forEach(channel => { + farcasterChannels.push(channel); + }); + + paginationCursor = next.cursor; + } catch (error) { + console.log('Failed to fetch followed Farcaster channels:', error); + throw new Error(getMessageForException(error) ?? 'unknown'); + } + } while (paginationCursor); + + return farcasterChannels; + } } export { NeynarClient };