fix: handle invalid client tag

packages/system/src/nostr-link.ts

@@ -235,16 +235,30 @@ export class NostrLink implements ToNostrEventTag {
       }
       case "A": {
         const [kind, author, dTag] = tag[1].split(":");
+        if (!isHex(author)) {
+          throw new Error(`Invalid author in A tag: ${tag[1]}`);
+        }
         return new NostrLink(NostrPrefix.Address, dTag, Number(kind), author, relays, "root");
       }
       case "a": {
         const [kind, author, dTag] = tag[1].split(":");
+        if (!isHex(author)) {
+          throw new Error(`Invalid author in a tag: ${tag[1]}`);
+        }
         return new NostrLink(NostrPrefix.Address, dTag, Number(kind), author, relays, tag[3]);
       }
     }
     throw new Error("Unknown tag!");
   }
 
+  static tryFromTag(tag: Array<string>, author?: string, kind?: number) {
+    try {
+      return NostrLink.fromTag(tag, author, kind);
+    } catch (e) {
+      // ignored
+    }
+  }
+
   static fromTags(tags: ReadonlyArray<Array<string>>) {
     return removeUndefined(
       tags.map(a => {