From 581ceecbf046f99b39885c74e2780a5320e5b15e Mon Sep 17 00:00:00 2001
From: bndw <ben@bdw.to>
Date: Fri, 13 Feb 2026 17:35:32 -0800
Subject: feat: add Nostr protocol implementation (internal/nostr,
 internal/websocket)

---
 internal/nostr/event.go | 72 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 internal/nostr/event.go

(limited to 'internal/nostr/event.go')

diff --git a/internal/nostr/event.go b/internal/nostr/event.go
new file mode 100644
index 0000000..a8156bb
--- /dev/null
+++ b/internal/nostr/event.go
@@ -0,0 +1,72 @@
+package nostr
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+)
+
+// Event represents a Nostr event as defined in NIP-01.
+type Event struct {
+	ID        string `json:"id"`
+	PubKey    string `json:"pubkey"`
+	CreatedAt int64  `json:"created_at"`
+	Kind      int    `json:"kind"`
+	Tags      Tags   `json:"tags"`
+	Content   string `json:"content"`
+	Sig       string `json:"sig"`
+}
+
+// Serialize returns the canonical JSON serialization of the event for ID computation.
+// Format: [0, "pubkey", created_at, kind, tags, "content"]
+func (e *Event) Serialize() []byte {
+	// Use json.Marshal for proper escaping of content and tags
+	arr := []interface{}{
+		0,
+		e.PubKey,
+		e.CreatedAt,
+		e.Kind,
+		e.Tags,
+		e.Content,
+	}
+	data, _ := json.Marshal(arr)
+	return data
+}
+
+// ComputeID calculates the SHA256 hash of the serialized event.
+// Returns the 64-character hex-encoded ID.
+func (e *Event) ComputeID() string {
+	serialized := e.Serialize()
+	hash := sha256.Sum256(serialized)
+	return hex.EncodeToString(hash[:])
+}
+
+// SetID computes and sets the event ID.
+func (e *Event) SetID() {
+	e.ID = e.ComputeID()
+}
+
+// CheckID verifies that the event ID matches the computed ID.
+func (e *Event) CheckID() bool {
+	return e.ID == e.ComputeID()
+}
+
+// MarshalJSON implements json.Marshaler with empty tags as [] instead of null.
+func (e Event) MarshalJSON() ([]byte, error) {
+	type eventAlias Event
+	ea := eventAlias(e)
+	if ea.Tags == nil {
+		ea.Tags = Tags{}
+	}
+	return json.Marshal(ea)
+}
+
+// String returns a JSON representation of the event for debugging.
+func (e *Event) String() string {
+	data, err := json.MarshalIndent(e, "", "  ")
+	if err != nil {
+		return fmt.Sprintf("<Event error: %v>", err)
+	}
+	return string(data)
+}
-- 
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