[APP-2160] Centralize known publisher lookup with strict host matching

Move the publisher list and host detection into a single publishers.ts
module so both PublicationMetaRow and the Subscribe button consult the
same source. Match exact hosts and proper subdomains only, rejecting
lookalikes like evilleaflet.pub.

src/components/Post/Embed/StandardSiteEmbed/PublicationMetaRow.tsx

@@ -1,4 +1,4 @@
-import {Fragment, type ReactNode, useMemo} from 'react'
+import {Fragment, type ReactNode} from 'react'
 import {View} from 'react-native'
 import {type AppBskyEmbedExternal} from '@atproto/api'
 import {Trans, useLingui} from '@lingui/react/macro'
@@ -8,6 +8,7 @@ import {toNiceDomain} from '#/lib/strings/url-helpers'
 import {useProfileQuery} from '#/state/queries/profile'
 import {atoms as a, useTheme} from '#/alf'
 import {InlineLinkText} from '#/components/Link'
+import {matchStandardSitePublisher} from '#/components/Post/Embed/StandardSiteEmbed/publishers'
 import {Text} from '#/components/Typography'
 
 export function PublicationMetaRow({
@@ -25,18 +26,7 @@ export function PublicationMetaRow({
   const {t: l} = useLingui()
   const profileQuery = useProfileQuery({did: author.did ?? undefined})
   const handle = author.did ? profileQuery.data?.handle : undefined
-  const highlightedPublisher = useMemo(() => {
-    try {
-      const u = new URL(view.source?.uri || '')
-      return (
-        u.host.endsWith('leaflet.pub') ||
-        u.host.endsWith('pckt.blog') ||
-        u.host.endsWith('offprint.app')
-      )
-    } catch (e) {
-      return false
-    }
-  }, [view])
+  const highlightedPublisher = !!matchStandardSitePublisher(view)
 
   const metaTextStyle = [
     a.text_xs,

src/components/Post/Embed/StandardSiteEmbed/index.tsx

@@ -14,14 +14,12 @@ import {ButtonIcon, ButtonText} from '#/components/Button'
 import {Divider} from '#/components/Divider'
 import {useInteractionState} from '#/components/hooks/useInteractionState'
 import {Clock_Stroke2_Corner0_Rounded as Clock} from '#/components/icons/Clock'
-import {Leaflet} from '#/components/icons/community/Leaflet'
-import {Offprint} from '#/components/icons/community/Offprint'
-import {Pckt} from '#/components/icons/community/Pckt'
 import {StandardSite} from '#/components/icons/community/StandardSite'
 import {Earth_Stroke2_Corner0_Rounded as Globe} from '#/components/icons/Globe'
 import {Link} from '#/components/Link'
 import {MediaInsetBorder} from '#/components/MediaInsetBorder'
 import {PublicationMetaRow} from '#/components/Post/Embed/StandardSiteEmbed/PublicationMetaRow'
+import {matchStandardSitePublisher} from '#/components/Post/Embed/StandardSiteEmbed/publishers'
 import {StandardSiteThemeProvider} from '#/components/Post/Embed/StandardSiteEmbed/StandardSiteThemeProvider'
 import {isStandardSitePublicationEmbed} from '#/components/Post/Embed/StandardSiteEmbed/utils'
 import {Text} from '#/components/Typography'
@@ -37,33 +35,6 @@ const PUBLICATION_AVATAR_STYLE = {
   borderRadius: a.rounded_sm.borderRadius,
 }
 
-export function useStandardSitePublisherConfig(
-  view: AppBskyEmbedExternal.ViewExternal,
-) {
-  try {
-    const u = new URL(view.source?.uri || '')
-    if (u.host.endsWith('leaflet.pub')) {
-      return {
-        name: 'Leaflet',
-        Icon: Leaflet,
-      }
-    } else if (u.host.endsWith('pckt.blog')) {
-      return {
-        name: 'pckt',
-        Icon: Pckt,
-      }
-    } else if (u.host.endsWith('offprint.app')) {
-      return {
-        name: 'Offprint',
-        Icon: Offprint,
-      }
-    }
-    return null
-  } catch (e) {
-    return null
-  }
-}
-
 export const StandardSiteEmbed = ({
   view,
   onOpen,
@@ -431,7 +402,7 @@ export function SubscribeButton({
   style?: StyleProp<ViewStyle>
 }) {
   const {t: l} = useLingui()
-  const highlightedPublisher = useStandardSitePublisherConfig(view)
+  const highlightedPublisher = matchStandardSitePublisher(view)
   const cta = highlightedPublisher
     ? l`Subscribe on ${highlightedPublisher.name}`
     : l`View publication`

src/components/Post/Embed/StandardSiteEmbed/publishers.ts

@@ -0,0 +1,39 @@
+import {type AppBskyEmbedExternal} from '@atproto/api'
+
+import {Leaflet} from '#/components/icons/community/Leaflet'
+import {Offprint} from '#/components/icons/community/Offprint'
+import {Pckt} from '#/components/icons/community/Pckt'
+
+export type StandardSitePublisher = {
+  host: string
+  name: string
+  Icon: typeof Leaflet
+}
+
+const STANDARD_SITE_PUBLISHERS: StandardSitePublisher[] = [
+  {host: 'leaflet.pub', name: 'Leaflet', Icon: Leaflet},
+  {host: 'pckt.blog', name: 'pckt', Icon: Pckt},
+  {host: 'offprint.app', name: 'Offprint', Icon: Offprint},
+]
+
+export function getStandardSitePublisherHost(
+  view: AppBskyEmbedExternal.ViewExternal,
+): string | null {
+  try {
+    return new URL(view.source?.uri || '').host
+  } catch {
+    return null
+  }
+}
+
+export function hostMatches(host: string, target: string): boolean {
+  return host === target || host.endsWith('.' + target)
+}
+
+export function matchStandardSitePublisher(
+  view: AppBskyEmbedExternal.ViewExternal,
+): StandardSitePublisher | null {
+  const host = getStandardSitePublisherHost(view)
+  if (!host) return null
+  return STANDARD_SITE_PUBLISHERS.find(p => hostMatches(host, p.host)) ?? null
+}

src/components/Post/Embed/StandardSiteEmbed/utils.test.ts

@@ -0,0 +1,70 @@
+import {type AppBskyEmbedExternal} from '@atproto/api'
+
+import {isStandardSiteEmbed, isStandardSitePublicationEmbed} from './utils'
+
+function makeView(
+  partial: Record<string, unknown>,
+): AppBskyEmbedExternal.ViewExternal {
+  return {
+    uri: 'https://example.com/post',
+    title: 'title',
+    description: 'description',
+    ...partial,
+  }
+}
+
+describe('isStandardSiteEmbed', () => {
+  it('returns true when any associated ref is in the site.standard.* namespace', () => {
+    const view = makeView({
+      associatedRefs: [{uri: 'at://did:plc:abc/site.standard.publication/foo'}],
+    })
+    expect(isStandardSiteEmbed(view)).toBe(true)
+  })
+
+  it('returns false when no associated refs are in the site.standard.* namespace', () => {
+    const view = makeView({
+      associatedRefs: [{uri: 'at://did:plc:abc/app.bsky.feed.post/foo'}],
+    })
+    expect(isStandardSiteEmbed(view)).toBe(false)
+  })
+
+  it('returns falsy when associatedRefs is missing', () => {
+    expect(isStandardSiteEmbed(makeView({}))).toBeFalsy()
+  })
+})
+
+describe('isStandardSitePublicationEmbed', () => {
+  it('returns true with at least one publication ref and no document refs', () => {
+    const view = makeView({
+      associatedRefs: [{uri: 'at://did:plc:abc/site.standard.publication/foo'}],
+    })
+    expect(isStandardSitePublicationEmbed(view)).toBe(true)
+  })
+
+  it('returns false when any ref is a document', () => {
+    const view = makeView({
+      associatedRefs: [
+        {uri: 'at://did:plc:abc/site.standard.publication/foo'},
+        {uri: 'at://did:plc:abc/site.standard.document/bar'},
+      ],
+    })
+    expect(isStandardSitePublicationEmbed(view)).toBe(false)
+  })
+
+  it('returns false when there are no publication refs', () => {
+    const view = makeView({
+      associatedRefs: [{uri: 'at://did:plc:abc/site.standard.other/foo'}],
+    })
+    expect(isStandardSitePublicationEmbed(view)).toBe(false)
+  })
+
+  it('returns falsy for an empty associatedRefs array', () => {
+    expect(isStandardSitePublicationEmbed(makeView({associatedRefs: []}))).toBe(
+      false,
+    )
+  })
+
+  it('returns falsy when associatedRefs is missing', () => {
+    expect(isStandardSitePublicationEmbed(makeView({}))).toBeFalsy()
+  })
+})