Add known likers to feed posts (#11595)

2026-08-31 10:56:30 -04:00
parent 89c8e1cb70
commit 4495462f84
9 changed files with 189 additions and 142 deletions
@@ -0,0 +1,113 @@
+import {View} from 'react-native'
+import {AtUri} from '@atproto/syntax'
+import {moderateProfile} from '@bsky/sdk/moderation'
+import {Trans, useLingui} from '@lingui/react/macro'
+
+import {makeProfileLink} from '#/lib/routes/links'
+import {sanitizeDisplayName} from '#/lib/strings/display-names'
+import {useModerationOpts} from '#/state/preferences/moderation-opts'
+import {atoms as a, useTheme} from '#/alf'
+import {AvatarStack} from '#/components/AvatarStack'
+import {InlineLinkText, Link} from '#/components/Link'
+import {ProfileHoverCard} from '#/components/ProfileHoverCard'
+import {Text} from '#/components/Typography'
+import {type Features, useAnalytics} from '#/analytics'
+import {type app} from '#/lexicons'
+
+/**
+ * Social proof for a post. When the viewer follows some of the post's recent
+ * likers, renders a face pile plus "Liked by A and B". Renders nothing when
+ * the feature is disabled or no visible known likers are available.
+ */
+export function KnownLikers({
+  post,
+  feature,
+  variant = 'thread',
+}: {
+  post: app.bsky.feed.defs.PostView
+  feature: Features
+  variant?: 'feed' | 'thread'
+}) {
+  const t = useTheme()
+  const {t: l} = useLingui()
+  const moderationOpts = useModerationOpts()
+  const ax = useAnalytics()
+
+  const knownLikersAndModeration = moderationOpts
+    ? (post.viewer?.knownLikers?.actors ?? [])
+        .map(actor => ({
+          actor,
+          moderation: moderateProfile(actor, moderationOpts),
+        }))
+        .filter(({moderation}) => !moderation.ui('profileList').filter)
+    : []
+
+  if (knownLikersAndModeration.length === 0 || !ax.features.enabled(feature)) {
+    return null
+  }
+
+  const urip = new AtUri(post.uri)
+  const likesHref = makeProfileLink(post.author, 'post', urip.rkey, 'liked-by')
+  const aviStackProfiles = knownLikersAndModeration
+    .slice(0, 3)
+    .map(({actor}) => actor)
+  const names = knownLikersAndModeration
+    .slice(0, 2)
+    .map(({actor, moderation}) => ({
+      did: actor.did,
+      href: makeProfileLink(actor),
+      displayName: sanitizeDisplayName(
+        actor.displayName || actor.handle,
+        moderation.ui('displayName'),
+      ),
+    }))
+  const isFeed = variant === 'feed'
+  const rowLabel =
+    names.length >= 2
+      ? l`Liked by ${names[0].displayName} and ${names[1].displayName}`
+      : l`Liked by ${names[0].displayName}`
+  const textStyle = [a.text_sm, t.atoms.text_contrast_medium]
+  const nameStyle = [a.text_sm, a.font_medium, t.atoms.text_contrast_medium]
+
+  const nameLink = (name: (typeof names)[number]) => (
+    <ProfileHoverCard key={name.did} did={name.did} inline>
+      <InlineLinkText
+        to={name.href}
+        label={l`Go to ${name.displayName}'s profile`}
+        disableMismatchWarning
+        emoji
+        style={nameStyle}>
+        {name.displayName}
+      </InlineLinkText>
+    </ProfileHoverCard>
+  )
+
+  return (
+    <View style={[a.w_full, a.flex_row, isFeed && a.mt_sm]}>
+      <Link
+        to={likesHref}
+        label={rowLabel}
+        style={[a.flex_row, a.align_center, a.gap_xs, a.flex_shrink]}
+        onPress={() => ax.metric('post:likedBy:click', {})}>
+        <AvatarStack
+          profiles={aviStackProfiles}
+          size={16}
+          overlap={4}
+          borderWidth={0.5}
+          backgroundColor={t.atoms.bg_contrast_25.backgroundColor}
+        />
+        <Text testID="knownLikersStat" style={[a.flex_shrink, textStyle]}>
+          {names.length >= 2 ? (
+            <Trans comment="Social proof below a post; the bolded names are people the viewer follows who liked the post">
+              Liked by {nameLink(names[0])} and {nameLink(names[1])}
+            </Trans>
+          ) : (
+            <Trans comment="Social proof below a post; the bolded name is a person the viewer follows who liked the post">
+              Liked by {nameLink(names[0])}
+            </Trans>
+          )}
+        </Text>
+      </Link>
+    </View>
+  )
+}