nip46 beginnings.

nip46.ts

@@ -0,0 +1,54 @@
+import { NIP05_REGEX } from './nip05.ts'
+
+var _fetch: any
+
+try {
+  _fetch = fetch
+} catch {}
+
+export function useFetchImplementation(fetchImplementation: any) {
+  _fetch = fetchImplementation
+}
+
+export const BUNKER_REGEX = /^bunker:\/\/[0-9a-f]{64}\??[?\/\w:.=&%]*$/
+
+type BunkerPointer = {
+  relays: string[]
+  pubkey: string
+  secret: null | string
+}
+
+/** This takes either a bunker:// URL or a name@domain.com NIP-05 identifier
+    and returns a BunkerPointer -- or null in case of error */
+export async function parseBunkerInput(input: string): Promise<BunkerPointer | null> {
+  let match = input.match(BUNKER_REGEX)
+  if (match) {
+    try {
+      const bunkerURL = new URL(input)
+      return {
+        pubkey: bunkerURL.host,
+        relays: bunkerURL.searchParams.getAll('relay'),
+        secret: bunkerURL.searchParams.get('secret'),
+      }
+    } catch (_err) {
+      /* just move to the next case */
+    }
+  }
+
+  match = input.match(NIP05_REGEX)
+  if (!match) return null
+
+  const [_, name = '_', domain] = match
+
+  try {
+    const url = `https://${domain}/.well-known/nostr.json?name=${name}`
+    const res = await (await _fetch(url, { redirect: 'error' })).json()
+
+    let pubkey = res.names[name]
+    let relays = res.nip46[pubkey] || []
+
+    return { pubkey, relays, secret: null }
+  } catch (_err) {
+    return null
+  }
+}