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diff --git a/keyserver/src/creators/farcaster-channel-tag-creator.js b/keyserver/src/creators/farcaster-channel-tag-creator.js
--- a/keyserver/src/creators/farcaster-channel-tag-creator.js
+++ b/keyserver/src/creators/farcaster-channel-tag-creator.js
@@ -10,6 +10,7 @@
import { threadPermissions } from 'lib/types/thread-permission-types.js';
import type { BlobOperationResult } from 'lib/utils/blob-service.js';
import { ServerError } from 'lib/utils/errors.js';
+import { ignorePromiseRejections } from 'lib/utils/promises.js';
import {
dbQuery,
@@ -17,6 +18,7 @@
MYSQL_DUPLICATE_ENTRY_FOR_KEY_ERROR_CODE,
} from '../database/database.js';
import { fetchCommunityInfos } from '../fetchers/community-fetchers.js';
+import { fetchServerThreadInfos } from '../fetchers/thread-fetchers.js';
import { checkThreadPermission } from '../fetchers/thread-permission-fetchers.js';
import {
uploadBlobKeyserverWrapper,
@@ -26,7 +28,9 @@
type BlobDownloadResult,
} from '../services/blob.js';
import { Viewer } from '../session/viewer.js';
+import { updateThread } from '../updaters/thread-updaters.js';
import { thisKeyserverID } from '../user/identity.js';
+import { neynarClient } from '../utils/fc-cache.js';
import { getAndAssertKeyserverURLFacts } from '../utils/urls.js';
async function createOrUpdateFarcasterChannelTag(
@@ -130,6 +134,50 @@
throw new ServerError('invalid_parameters');
}
+ // In the background, we fetch information about the community thread and
+ // corresponding Farcaster channel. If the thread's avatar or description has
+ // not already been set, we set them to the values from the channel.
+ ignorePromiseRejections(
+ (async () => {
+ const neynarChannelDescriptionPromise = (async () => {
+ if (!neynarClient) {
+ return '';
+ }
+ const channelInfo = await neynarClient?.fetchFarcasterChannelByID(
+ request.farcasterChannelID,
+ );
+ if (!channelInfo) {
+ return '';
+ }
+ return channelInfo.description;
+ })();
+
+ const [fcChannelDescription, serverThreadInfos] = await Promise.all([
+ neynarChannelDescriptionPromise,
+ fetchServerThreadInfos({ threadID: request.commCommunityID }),
+ ]);
+
+ const { avatar, description } =
+ serverThreadInfos.threadInfos[request.commCommunityID];
+ if (avatar && description) {
+ return;
+ }
+
+ let changes = {};
+ if (!avatar) {
+ changes = { ...changes, avatar: { type: 'farcaster' } };
+ }
+ if (!description) {
+ changes = { ...changes, description: fcChannelDescription };
+ }
+
+ await updateThread(viewer, {
+ threadID: request.commCommunityID,
+ changes,
+ });
+ })(),
+ );
+
return {
commCommunityID: request.commCommunityID,
farcasterChannelID: request.farcasterChannelID,

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