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D12065.vs40275.id41343.diff
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D12065.vs40275.id41343.diff
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diff --git a/native/components/auto-join-community-handler.react.js b/native/components/auto-join-community-handler.react.js
new file mode 100644
--- /dev/null
+++ b/native/components/auto-join-community-handler.react.js
@@ -0,0 +1,143 @@
+// @flow
+
+import * as React from 'react';
+
+import {
+ joinThreadActionTypes,
+ useJoinThread,
+} from 'lib/actions/thread-actions.js';
+import { NeynarClientContext } from 'lib/components/neynar-client-provider.react.js';
+import blobService from 'lib/facts/blob-service.js';
+import { cookieSelector } from 'lib/selectors/keyserver-selectors.js';
+import { farcasterChannelTagBlobHash } from 'lib/shared/community-utils.js';
+import { authoritativeKeyserverID } from 'lib/utils/authoritative-keyserver.js';
+import { getBlobFetchableURL } from 'lib/utils/blob-service.js';
+import { useCurrentUserFID } from 'lib/utils/farcaster-utils.js';
+import { useDispatchActionPromise } from 'lib/utils/redux-promise-utils.js';
+
+import { nonThreadCalendarQuery } from '../navigation/nav-selectors.js';
+import { NavContext } from '../navigation/navigation-context.js';
+import { useSelector } from '../redux/redux-utils.js';
+
+function AutoJoinCommunityHandler(): React.Node {
+ const isActive = useSelector(state => state.lifecycleState !== 'background');
+
+ const cookie = useSelector(cookieSelector(authoritativeKeyserverID()));
+ const hasUserCookie = !!(cookie && cookie.startsWith('user='));
+ const currentUserID = useSelector(state => state.currentUserInfo?.id);
+ const loggedIn = !!currentUserID && hasUserCookie;
+
+ const fid = useCurrentUserFID();
+
+ const neynarClient = React.useContext(NeynarClientContext)?.client;
+
+ const navContext = React.useContext(NavContext);
+
+ const calendarQuery = useSelector(state =>
+ nonThreadCalendarQuery({
+ redux: state,
+ navContext,
+ }),
+ );
+
+ const joinThread = useJoinThread();
+
+ const joinThreadActionPromise = React.useCallback(
+ async (communityID: string) => {
+ const query = calendarQuery();
+
+ return await joinThread({
+ threadID: communityID,
+ calendarQuery: {
+ startDate: query.startDate,
+ endDate: query.endDate,
+ filters: [
+ ...query.filters,
+ { type: 'threads', threadIDs: [communityID] },
+ ],
+ },
+ });
+ },
+ [calendarQuery, joinThread],
+ );
+
+ const dispatchActionPromise = useDispatchActionPromise();
+
+ const threadInfos = useSelector(state => state.threadStore.threadInfos);
+
+ React.useEffect(() => {
+ if (!loggedIn || !isActive || !fid || !neynarClient || !threadInfos) {
+ return;
+ }
+
+ void (async () => {
+ const followedFarcasterChannels =
+ await neynarClient.fetchFollowedFarcasterChannels(fid);
+
+ const followedFarcasterChannelIDs = followedFarcasterChannels.map(
+ channel => channel.id,
+ );
+
+ const fetchBlobPromises = followedFarcasterChannelIDs.map(channelID => {
+ const blobHash = farcasterChannelTagBlobHash(channelID);
+ const blobURL = getBlobFetchableURL(blobHash);
+
+ return fetch(blobURL, {
+ method: blobService.httpEndpoints.GET_BLOB.method,
+ });
+ });
+
+ const fetchBlobResults = await Promise.all(fetchBlobPromises);
+
+ const farcasterChannelTagBlobsPromises = fetchBlobResults
+ .map(blobResult => {
+ if (blobResult.status !== 200) {
+ return null;
+ }
+
+ return blobResult.json();
+ })
+ .filter(Boolean);
+
+ const farcasterChannelTagBlobs: $ReadOnlyArray<{
+ +commCommunityID: string,
+ +farcasterChannelID: string,
+ }> = await Promise.all(farcasterChannelTagBlobsPromises);
+
+ const joinThreadPromises = farcasterChannelTagBlobs
+ .map(blob => {
+ const { commCommunityID } = blob;
+
+ const keyserverID = commCommunityID.split('|')[0];
+ if (keyserverID !== authoritativeKeyserverID()) {
+ return null;
+ }
+
+ // The user is already in the community
+ if (threadInfos[commCommunityID]) {
+ return null;
+ }
+
+ return dispatchActionPromise(
+ joinThreadActionTypes,
+ joinThreadActionPromise(commCommunityID),
+ );
+ })
+ .filter(Boolean);
+
+ await Promise.all(joinThreadPromises);
+ })();
+ }, [
+ threadInfos,
+ dispatchActionPromise,
+ fid,
+ isActive,
+ joinThreadActionPromise,
+ loggedIn,
+ neynarClient,
+ ]);
+
+ return null;
+}
+
+export { AutoJoinCommunityHandler };
diff --git a/native/root.react.js b/native/root.react.js
--- a/native/root.react.js
+++ b/native/root.react.js
@@ -48,6 +48,7 @@
import ChatContextProvider from './chat/chat-context-provider.react.js';
import MessageEditingContextProvider from './chat/message-editing-context-provider.react.js';
import AccessTokenHandler from './components/access-token-handler.react.js';
+import { AutoJoinCommunityHandler } from './components/auto-join-community-handler.react.js';
import BackgroundIdentityLoginHandler from './components/background-identity-login-handler.react.js';
import ConnectFarcasterAlertHandler from './components/connect-farcaster-alert-handler.react.js';
import { FeatureFlagsProvider } from './components/feature-flags-provider.react.js';
@@ -346,6 +347,7 @@
<PrekeysHandler />
<ReportHandler />
<FarcasterDataHandler />
+ <AutoJoinCommunityHandler />
</PersistedStateGate>
{navigation}
</RegistrationContextProvider>

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