feat: add Nostr protocol implementation (internal/nostr, internal/websocket)

1 files changed, 51 insertions, 0 deletions

diff --git a/internal/nostr/kinds.go b/internal/nostr/kinds.go
new file mode 100644
index 0000000..cb76e88
--- /dev/null
+++ b/internal/nostr/kinds.go
@@ -0,0 +1,51 @@
+package nostr
+
+// Event kind constants as defined in NIP-01 and related NIPs.
+const (
+        KindMetadata    = 0
+        KindTextNote    = 1
+        KindContactList = 3
+        KindEncryptedDM = 4
+        KindDeletion    = 5
+        KindRepost      = 6
+        KindReaction    = 7
+)
+
+// IsRegular returns true if the kind is a regular event (stored, not replaced).
+// Regular events: 1000 <= kind < 10000 or kind in {0,1,2,...} except replaceable ones.
+func IsRegular(kind int) bool {
+        if kind == KindMetadata || kind == KindContactList {
+                return false
+        }
+        if kind >= 10000 && kind < 20000 {
+                return false // replaceable
+        }
+        if kind >= 20000 && kind < 30000 {
+                return false // ephemeral
+        }
+        if kind >= 30000 && kind < 40000 {
+                return false // addressable
+        }
+        return true
+}
+
+// IsReplaceable returns true if the kind is replaceable (NIP-01).
+// Replaceable events: 10000 <= kind < 20000, or kind 0 (metadata) or kind 3 (contact list).
+func IsReplaceable(kind int) bool {
+        if kind == KindMetadata || kind == KindContactList {
+                return true
+        }
+        return kind >= 10000 && kind < 20000
+}
+
+// IsEphemeral returns true if the kind is ephemeral (not stored).
+// Ephemeral events: 20000 <= kind < 30000.
+func IsEphemeral(kind int) bool {
+        return kind >= 20000 && kind < 30000
+}
+
+// IsAddressable returns true if the kind is addressable (parameterized replaceable).
+// Addressable events: 30000 <= kind < 40000.
+func IsAddressable(kind int) bool {
+        return kind >= 30000 && kind < 40000
+}