Add signing engine, refine ui

src/engine/delivery.ts

@@ -0,0 +1,35 @@
+import { Nip59, Nip01Signer } from "@welshman/signer"
+import { signer, repository, publishThunk, getMessagingRelayList } from "@welshman/app"
+import { getRelaysFromList } from "@welshman/util"
+import type { HashedEvent } from "@welshman/util"
+import { Router } from "@welshman/router"
+
+const TOPIC = "b7ed"
+
+// TODO: PROTOCOL.md §Event Kinds requires at least 16 bits of proof-of-work (NIP-13)
+// on each kind 1059 gift wrap. PoW is out of scope for this pass; the ["t","b7ed"]
+// topic tag below IS required and is always present.
+
+function inboxRelays(pubkey: string): string[] {
+  const relays = getRelaysFromList(getMessagingRelayList(pubkey))
+  return relays.length ? relays : Router.get().ForPubkey(pubkey).getUrls()
+}
+
+/** Gift-wrap a rumor to one recipient (with the b7ed topic tag) and publish to their inbox relays. */
+export async function deliverTo(recipient: string, rumor: HashedEvent): Promise<void> {
+  const $signer = signer.get()
+  if (!$signer) { throw new Error("Cannot send without a signer") }
+  const nip59 = new Nip59($signer, Nip01Signer.ephemeral())
+  const wrap = await nip59.wrap(recipient, rumor, [["t", TOPIC]])
+  publishThunk({ event: wrap, relays: inboxRelays(recipient) })
+}
+
+/**
+ * Broadcast one rumor to many recipients. Stores a local copy in the repository (so our own derived
+ * state reflects what we sent) unless storeLocal is false. Per-recipient payloads (round-2 shares) call
+ * deliverTo directly with storeLocal handled by the caller. Recipients should EXCLUDE self.
+ */
+export async function sendProtocolEvent(rumor: HashedEvent, recipients: string[], opts: { storeLocal?: boolean } = {}): Promise<void> {
+  if (opts.storeLocal !== false) { repository.publish(rumor) }
+  await Promise.all(recipients.map(r => deliverTo(r, rumor).catch(e => console.error("deliver failed", r, e))))
+}