validate events on receive

packages/system/src/event-ext.ts

@@ -4,6 +4,7 @@ import { getPublicKey, sha256, unixNow } from "@snort/shared";
 
 import { EventKind, HexKey, NostrEvent, NotSignedNostrEvent } from ".";
 import { minePow } from "./pow-util";
+import { findTag } from "./utils";
 
 export interface Tag {
   key: string;
@@ -19,6 +20,12 @@ export interface Thread {
   pubKeys: Array<HexKey>;
 }
 
+export const enum EventType {
+  Regular,
+  Replaceable,
+  ParameterizedReplaceable,
+}
+
 export abstract class EventExt {
   /**
    * Get the pub key of the creator of this event NIP-26
@@ -149,4 +156,25 @@ export abstract class EventExt {
     e.pubkey ??= "";
     e.sig ??= "";
   }
+
+  static getType(kind: number) {
+    const legacyReplaceable = [0, 3, 41];
+    if (kind >= 30_000 && kind < 40_000) {
+      return EventType.ParameterizedReplaceable;
+    } else if (kind >= 10_000 && kind < 20_000) {
+      return EventType.Replaceable;
+    } else if (legacyReplaceable.includes(kind)) {
+      return EventType.Replaceable;
+    } else {
+      return EventType.Regular;
+    }
+  }
+
+  static isValid(ev: NostrEvent) {
+    const type = EventExt.getType(ev.kind);
+    if (type === EventType.ParameterizedReplaceable) {
+      if (!findTag(ev, "d")) return false;
+    }
+    return true;
+  }
 }