Add app package

packages/app/src/handles.ts

@@ -0,0 +1,65 @@
+import {writable, derived} from 'svelte/store'
+import {withGetter} from '@welshman/store'
+import {uniq, indexBy, uniqBy, batcher, postJson, last} from '@welshman/lib'
+import {env} from './core'
+import {collection} from './collection'
+import {profilesByPubkey} from './profiles'
+
+export type Handle = {
+  nip05: string
+  pubkey?: string
+  nip46?: string[]
+  relays?: string[]
+}
+
+export const handles = withGetter(writable<Handle[]>([]))
+
+export const handlesByPubkey = derived([profilesByPubkey, handles], ([$profilesByPubkey, $handles]) =>
+  indexBy(
+    $handle => $handle.pubkey,
+    $handles.filter($handle => $handle.pubkey && $profilesByPubkey.get($handle.pubkey)?.nip05 === $handle.nip05),
+  ),
+)
+
+export const fetchHandles = (handles: string[]) => {
+  const base = env.DUFFLEPUD_URL!
+
+  if (!base) {
+    throw new Error("DUFFLEPUD_URL is required to fetch nip05 info")
+  }
+
+  const res: any = postJson(`${base}/handle/info`, {handles})
+  const handlesByNip05 = new Map<string, Handle>()
+
+  for (const {handle, info} of res?.data || []) {
+    handlesByNip05.set(handle, info)
+  }
+
+  return handlesByNip05
+}
+
+export const {
+  indexStore: handlesByNip05,
+  deriveItem: deriveHandle,
+  loadItem: loadHandle,
+} = collection({
+  name: "handles",
+  store: handles,
+  getKey: (handle: Handle) => handle.nip05,
+  load: batcher(800, async (nip05s: string[]) => {
+    const fresh = await fetchHandles(uniq(nip05s))
+    const stale = handlesByNip05.get()
+    const items: Handle[] = nip05s.map(nip05 => {
+      const handle = fresh.get(nip05) || stale.get(nip05) || {}
+
+      return {...handle, nip05}
+    })
+
+    handles.update($handles => uniqBy($handle => $handle.nip05, [...$handles, ...items]))
+
+    return items
+  }),
+})
+
+export const displayHandle = (handle: Handle) =>
+  handle.nip05.startsWith("_@") ? last(handle.nip05.split("@")) : handle.nip05