extract functions and add tests

src/components/hooks/useStarterPackEntry.native.ts

@@ -1,6 +1,6 @@
 import React from 'react'
 
-import {makeStarterPackLink} from 'lib/routes/links'
+import {createStarterPackLinkFromAndroidReferrer} from 'lib/strings/starter-pack'
 import {isAndroid} from 'platform/detection'
 import {useSetCurrentStarterPack} from 'state/preferences/starter-pack'
 import {useUsedStarterPacks} from 'state/preferences/used-starter-packs'
@@ -24,14 +24,7 @@ export function useStarterPackEntry() {
         const res = await GooglePlayReferrer.getReferrerInfoAsync()
 
         if (res && res.installReferrer) {
-          const parts = res.installReferrer.split('&')
-          const starterPackSource = parts
-            .find(part => part.startsWith('utm_content='))
-            ?.split('=')[1]
-          const sourceParts = starterPackSource?.split('-')
-          if (sourceParts?.length === 3 && sourceParts[0] === 'starterpack') {
-            uri = makeStarterPackLink(sourceParts[1], sourceParts[2])
-          }
+          uri = createStarterPackLinkFromAndroidReferrer(res.installReferrer)
         }
       } else {
         uri = await SwissArmyKnife.getStringValueAsync('starterPackUri', true)

src/lib/strings/starter-pack.ts

@@ -0,0 +1,54 @@
+import {makeStarterPackLink} from 'lib/routes/links'
+
+export function createStarterPackLinkFromAndroidReferrer(
+  referrerQueryString: string,
+): string | null {
+  try {
+    // The referrer string is just some URL parameters, so lets add them to a fake URL
+    const url = new URL('http://throwaway.com/?' + referrerQueryString)
+    const utmContent = url.searchParams.get('utm_content')
+    const utmSource = url.searchParams.get('utm_source')
+
+    if (!utmContent) return null
+    if (utmSource !== 'bluesky') return null
+
+    // This should be a string like `starterpack-haileyok.com-rkey`
+    const contentParts = utmContent.split('-')
+
+    if (contentParts[0] !== 'starterpack') return null
+    if (contentParts.length !== 3) return null
+
+    return makeStarterPackLink(contentParts[1], contentParts[2])
+  } catch (e) {
+    return null
+  }
+}
+
+export function parseStarterPackHttpUri(uri: string): {
+  name?: string
+  rkey?: string
+} | null {
+  try {
+    const url = new URL(uri)
+    const parts = url.pathname.split('/')
+    const name = parts[2]
+    const rkey = parts[3]
+
+    if (parts.length !== 4) return null
+    if (!name || !rkey) return null
+    return {
+      name,
+      rkey,
+    }
+  } catch (e) {
+    return null
+  }
+}
+
+export function createStarterPackGooglePlayUri(
+  name: string,
+  rkey: string,
+): string | null {
+  if (!name || !rkey) return null
+  return `https://play.google.com/store/apps/details?id=xyz.blueskyweb.app&referrer=utm_source%3Dbluesky%26utm_medium%3Dstarterpack%26utm_content%3Dstarterpack-${name}-${rkey}`
+}

src/screens/StarterPack/StarterPackLandingScreen.tsx

@@ -7,6 +7,10 @@ import {useLingui} from '@lingui/react'
 
 import {isAndroidWeb} from 'lib/browser'
 import {useWebMediaQueries} from 'lib/hooks/useWebMediaQueries'
+import {
+  createStarterPackGooglePlayUri,
+  parseStarterPackHttpUri,
+} from 'lib/strings/starter-pack'
 import {isWeb} from 'platform/detection'
 import {
   useCurrentStarterPack,
@@ -41,27 +45,31 @@ function postAppClipMessage(message: AppClipMessage) {
   window.webkit.messageHandlers.onMessage.postMessage(JSON.stringify(message))
 }
 
-function parseStarterPackHttpUri(uri: string): {name?: string; rkey?: string} {
-  try {
-    const parsed = new URL(uri)
-    const [_, _path, name, rkey] = parsed.pathname.split('/')
-    return {
-      name,
-      rkey,
-    }
-  } catch (e) {
-    return {}
-  }
-}
-
-function createGooglePlayLink(name: string, rkey: string) {
-  return `https://play.google.com/store/apps/details?id=xyz.blueskyweb.app&referrer=utm_source%3Dbluesky%26utm_medium%3Dstarterpack%26utm_content%3Dstarterpack-${name}-${rkey}`
-}
-
 export function LandingScreen({
   setScreenState,
 }: {
   setScreenState: (state: LoggedOutScreenState) => void
+}) {
+  const currentStarterPack = useCurrentStarterPack()
+  const parsed = parseStarterPackHttpUri(currentStarterPack?.uri || '')
+
+  React.useEffect(() => {
+    if (!parsed) {
+      setScreenState(LoggedOutScreenState.S_LoginOrCreateAccount)
+    }
+  }, [parsed, setScreenState])
+
+  if (parsed) {
+    return null
+  }
+
+  return <LandingScreenInner setScreenState={setScreenState} />
+}
+
+export function LandingScreenInner({
+  setScreenState,
+}: {
+  setScreenState: (state: LoggedOutScreenState) => void
 }) {
   const currentStarterPack = useCurrentStarterPack()
   const {name, rkey} =
@@ -98,14 +106,14 @@ export function LandingScreen({
   }
 
   return (
-    <LandingScreenInner
+    <LandingScreenLoaded
       starterPack={starterPack}
       setScreenState={setScreenState}
     />
   )
 }
 
-function LandingScreenInner({
+function LandingScreenLoaded({
   starterPack,
   setScreenState,
 }: {
@@ -326,7 +334,13 @@ function LandingScreenInner({
               const rkey = new AtUri(starterPack.uri).rkey
               if (!rkey) return
 
-              window.location.href = createGooglePlayLink(creator.handle, rkey)
+              const googlePlayUri = createStarterPackGooglePlayUri(
+                creator.handle,
+                rkey,
+              )
+              if (!googlePlayUri) return
+
+              window.location.href = googlePlayUri
             }}
           />
           <Prompt.Action