add getFollowerCountFromHub method

src/functions/getFollowerCount.ts

@@ -1,6 +1,9 @@
 import { Provider, HubProvider, NeynarProvider } from '../providers';
 
-export const getFollowerCount = async (provider: Provider, fid: number): Promise<number> => {
+export const getFollowerCount = async (
+  provider: Provider,
+  fid: number
+): Promise<number> => {
   let url: string;
 
   if (provider instanceof HubProvider) {
@@ -20,4 +23,83 @@ export const getFollowerCount = async (provider: Provider, fid: number): Promise
   const data = await response.json();
 
   return data.followerCount;
-}
+};
+type Bio = {
+  text: string;
+};
+
+type Profile = {
+  bio: Bio;
+};
+
+type VerifiedAddresses = {
+  eth_addresses: string[];
+  sol_addresses: string[];
+};
+
+type User = {
+  object: string;
+  fid: number;
+  custody_address: string;
+  username: string;
+  display_name: string;
+  pfp_url: string;
+  profile: Profile;
+  follower_count: number;
+  following_count: number;
+  verifications: string[];
+  verified_addresses: VerifiedAddresses;
+  active_status: string;
+};
+
+type Follow = {
+  object: string;
+  user: User;
+};
+
+type UserDehydrated = {
+  object: string;
+  fid: number;
+};
+
+type FollowDehydrated = {
+  object: string;
+  user: UserDehydrated;
+};
+
+type ApiResponse = {
+  top_relevant_followers_hydrated: Follow[];
+  all_relevant_followers_dehydrated: FollowDehydrated[];
+};
+
+async function getFollowerCountFromHub(
+  provider: NeynarProvider,
+  targetFid: number,
+  viewerFid: number
+): Promise<User[]> {
+  const options = {
+    method: 'GET',
+    headers: {
+      accept: 'application/json',
+      api_key: provider.apiKey,
+    },
+  };
+
+  const response = await fetch(
+    `${provider.endPoint}/v2/farcaster/followers/relevant?target_fid=${targetFid}&viewer_fid=${viewerFid}`,
+    options
+  );
+
+  if (!response.ok) {
+    throw new Error('Network response was not ok');
+  }
+
+  const data: ApiResponse = await response.json();
+
+  // Extract the User objects from the response
+  const users: User[] = data.top_relevant_followers_hydrated.map(
+    follow => follow.user
+  );
+
+  return users;
+}