feat: NIP-24

packages/app/src/Cache/GiftWrapCache.ts

@@ -0,0 +1,59 @@
+import { FeedCache } from "@snort/shared";
+import { EventKind, EventPublisher, TaggedNostrEvent } from "@snort/system";
+import { UnwrappedGift, db } from "Db";
+import { findTag, unwrap } from "SnortUtils";
+
+export class GiftWrapCache extends FeedCache<UnwrappedGift> {
+  constructor() {
+    super("GiftWrapCache", db.gifts);
+  }
+
+  key(of: UnwrappedGift): string {
+    return of.id;
+  }
+
+  override async preload(): Promise<void> {
+    await super.preload();
+    await this.buffer([...this.onTable]);
+  }
+
+  newest(): number {
+    let ret = 0;
+    this.cache.forEach(v => (ret = v.created_at > ret ? v.created_at : ret));
+    return ret;
+  }
+
+  takeSnapshot(): Array<UnwrappedGift> {
+    return [...this.cache.values()];
+  }
+
+  async onEvent(evs: Array<TaggedNostrEvent>, pub: EventPublisher) {
+    const unwrapped = (
+      await Promise.all(
+        evs.map(async v => {
+          try {
+            return {
+              id: v.id,
+              to: findTag(v, "p"),
+              created_at: v.created_at,
+              inner: await pub.unwrapGift(v),
+            } as UnwrappedGift;
+          } catch (e) {
+            console.debug(e, v);
+          }
+        })
+      )
+    )
+      .filter(a => a !== undefined)
+      .map(unwrap);
+
+    // HACK: unseal to get p tags
+    for (const u of unwrapped) {
+      if (u.inner.kind === EventKind.SealedRumor) {
+        const unsealed = await pub.unsealRumor(u.inner);
+        u.tags = unsealed.tags;
+      }
+    }
+    await this.bulkSet(unwrapped);
+  }
+}