Handle nsfw feeds in public view

src/state/queries/post-feed.ts

@@ -1,4 +1,4 @@
-import {AppBskyFeedDefs, AppBskyFeedPost} from '@atproto/api'
+import {AppBskyFeedDefs, AppBskyFeedPost, moderatePost} from '@atproto/api'
 import {
   useInfiniteQuery,
   InfiniteData,
@@ -18,6 +18,10 @@ import {MergeFeedAPI} from 'lib/api/feed/merge'
 import {logger} from '#/logger'
 import {STALE} from '#/state/queries'
 import {precacheFeedPosts as precacheResolvedUris} from './resolve-uri'
+import {getAgent} from '#/state/session'
+import {DEFAULT_LOGGED_OUT_PREFERENCES} from '#/state/queries/preferences/const'
+import {getModerationOpts} from '#/state/queries/preferences/moderation'
+import {KnownError} from '#/view/com/posts/FeedErrorMessage'
 
 type ActorDid = string
 type AuthorFilter =
@@ -103,6 +107,38 @@ export function usePostFeedQuery(
       const res = await api.fetch({cursor, limit: 30})
       precacheResolvedUris(queryClient, res.feed) // precache the handle->did resolution
       const slices = tuner.tune(res.feed)
+
+      /*
+       * If this is a public view, we need to check if posts fail moderation.
+       * If all fail, we throw an error. If only some fail, we continue and let
+       * moderations happen later, which results in some posts being shown and
+       * some not.
+       */
+      if (!getAgent().session) {
+        // assume false
+        let somePostsPassModeration = false
+
+        for (const slice of slices) {
+          for (let i = 0; i < slice.items.length; i++) {
+            const item = slice.items[i]
+            const moderationOpts = getModerationOpts({
+              userDid: '',
+              preferences: DEFAULT_LOGGED_OUT_PREFERENCES,
+            })
+            const moderation = moderatePost(item.post, moderationOpts)
+
+            if (!moderation.content.filter) {
+              // we have a sfw post
+              somePostsPassModeration = true
+            }
+          }
+        }
+
+        if (!somePostsPassModeration) {
+          throw new Error(KnownError.FeedNSFPublic)
+        }
+      }
+
       return {
         api,
         tuner,

src/view/com/posts/FeedErrorMessage.tsx

@@ -17,28 +17,15 @@ import {EmptyState} from '../util/EmptyState'
 import {cleanError} from '#/lib/strings/errors'
 import {useRemoveFeedMutation} from '#/state/queries/preferences'
 
-enum KnownError {
-  Block,
-  FeedgenDoesNotExist,
-  FeedgenMisconfigured,
-  FeedgenBadResponse,
-  FeedgenOffline,
-  FeedgenUnknown,
-  Unknown,
-}
-
-const MESSAGES = {
-  [KnownError.Unknown]: '',
-  [KnownError.Block]: '',
-  [KnownError.FeedgenDoesNotExist]: `Hmmm, we're having trouble finding this feed. It may have been deleted.`,
-  [KnownError.FeedgenMisconfigured]:
-    'Hmm, the feed server appears to be misconfigured. Please let the feed owner know about this issue.',
-  [KnownError.FeedgenBadResponse]:
-    'Hmm, the feed server gave a bad response. Please let the feed owner know about this issue.',
-  [KnownError.FeedgenOffline]:
-    'Hmm, the feed server appears to be offline. Please let the feed owner know about this issue.',
-  [KnownError.FeedgenUnknown]:
-    'Hmm, some kind of issue occured when contacting the feed server. Please let the feed owner know about this issue.',
+export enum KnownError {
+  Block = 'Block',
+  FeedgenDoesNotExist = 'FeedgenDoesNotExist',
+  FeedgenMisconfigured = 'FeedgenMisconfigured',
+  FeedgenBadResponse = 'FeedgenBadResponse',
+  FeedgenOffline = 'FeedgenOffline',
+  FeedgenUnknown = 'FeedgenUnknown',
+  FeedNSFPublic = 'FeedNSFPublic',
+  Unknown = 'Unknown',
 }
 
 export function FeedErrorMessage({
@@ -90,7 +77,32 @@ function FeedgenErrorMessage({
   const pal = usePalette('default')
   const {_: _l} = useLingui()
   const navigation = useNavigation<NavigationProp>()
-  const msg = MESSAGES[knownError]
+  const msg = React.useMemo(
+    () =>
+      ({
+        [KnownError.Unknown]: '',
+        [KnownError.Block]: '',
+        [KnownError.FeedgenDoesNotExist]: _l(
+          msgLingui`Hmmm, we're having trouble finding this feed. It may have been deleted.`,
+        ),
+        [KnownError.FeedgenMisconfigured]: _l(
+          msgLingui`Hmm, the feed server appears to be misconfigured. Please let the feed owner know about this issue.`,
+        ),
+        [KnownError.FeedgenBadResponse]: _l(
+          msgLingui`Hmm, the feed server gave a bad response. Please let the feed owner know about this issue.`,
+        ),
+        [KnownError.FeedgenOffline]: _l(
+          msgLingui`Hmm, the feed server appears to be offline. Please let the feed owner know about this issue.`,
+        ),
+        [KnownError.FeedNSFPublic]: _l(
+          msgLingui`We're sorry, but this content is not viewable without a Bluesky account.`,
+        ),
+        [KnownError.FeedgenUnknown]: _l(
+          msgLingui`Hmm, some kind of issue occured when contacting the feed server. Please let the feed owner know about this issue.`,
+        ),
+      }[knownError]),
+    [_l, knownError],
+  )
   const [_, uri] = feedDesc.split('|')
   const [ownerDid] = safeParseFeedgenUri(uri)
   const {openModal, closeModal} = useModalControls()
@@ -121,6 +133,36 @@ function FeedgenErrorMessage({
     })
   }, [openModal, closeModal, uri, removeFeed, _l])
 
+  const cta = React.useMemo(() => {
+    switch (knownError) {
+      case KnownError.FeedNSFPublic: {
+        return null
+      }
+      case KnownError.FeedgenDoesNotExist:
+      case KnownError.FeedgenMisconfigured:
+      case KnownError.FeedgenBadResponse:
+      case KnownError.FeedgenOffline:
+      case KnownError.FeedgenUnknown: {
+        return (
+          <View style={{flexDirection: 'row', alignItems: 'center', gap: 10}}>
+            {knownError === KnownError.FeedgenDoesNotExist && (
+              <Button
+                type="inverted"
+                label="Remove feed"
+                onPress={onRemoveFeed}
+              />
+            )}
+            <Button
+              type="default-light"
+              label="View profile"
+              onPress={onViewProfile}
+            />
+          </View>
+        )
+      }
+    }
+  }, [knownError, onViewProfile, onRemoveFeed])
+
   return (
     <View
       style={[
@@ -134,16 +176,7 @@ function FeedgenErrorMessage({
         },
       ]}>
       <Text style={pal.text}>{msg}</Text>
-      <View style={{flexDirection: 'row', alignItems: 'center', gap: 10}}>
-        {knownError === KnownError.FeedgenDoesNotExist && (
-          <Button type="inverted" label="Remove feed" onPress={onRemoveFeed} />
-        )}
-        <Button
-          type="default-light"
-          label="View profile"
-          onPress={onViewProfile}
-        />
-      </View>
+      {cta}
     </View>
   )
 }
@@ -196,5 +229,8 @@ function detectKnownError(
   if (error.includes('feed provided an invalid response')) {
     return KnownError.FeedgenBadResponse
   }
+  if (error.includes(KnownError.FeedNSFPublic)) {
+    return KnownError.FeedNSFPublic
+  }
   return KnownError.FeedgenUnknown
 }