extract functions and add tests

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}`
+}