binary/hybrid Marshal() fails if event has any items over the limits.

binary/limits.go

@@ -1,10 +1,35 @@
 package binary
 
-import "math"
+import (
+	"math"
+
+	"github.com/nbd-wtf/go-nostr"
+)
 
 const (
-	MaxContentSize = math.MaxUint16
-	MaxKind        = math.MaxUint16
-	MaxTagCount    = math.MaxUint16
-	MaxTagSize     = math.MaxUint16
+	MaxKind         = math.MaxUint16
+	MaxCreatedAt    = math.MaxUint32
+	MaxContentSize  = math.MaxUint16
+	MaxTagCount     = math.MaxUint16
+	MaxTagItemCount = math.MaxUint8
+	MaxTagItemSize  = math.MaxUint16
 )
+
+func EventEligibleForBinaryEncoding(event *nostr.Event) bool {
+	if len(event.Content) > MaxContentSize || event.Kind > MaxKind || event.CreatedAt > MaxCreatedAt || len(event.Tags) > MaxTagCount {
+		return false
+	}
+
+	for _, tag := range event.Tags {
+		if len(tag) > MaxTagItemCount {
+			return false
+		}
+		for _, item := range tag {
+			if len(item) > MaxTagItemSize {
+				return false
+			}
+		}
+	}
+
+	return true
+}