Refactored into namespaced packages.

events/event.go

@@ -0,0 +1,35 @@
+// Roots is a purposefully minimal Nostr protocol library that provides only
+// the primitives that define protocol compliance: event structure,
+// serialization, cryptographic signatures, and subscription filters.
+package events
+
+import (
+	"regexp"
+)
+
+// Tag represents a single tag within an event as an array of strings.
+// The first element identifies the tag name, the second contains the value,
+// and subsequent elements are optional.
+type Tag []string
+
+// Event represents a Nostr protocol event, with its seven required fields.
+// All fields must be present for a valid event.
+type Event struct {
+	ID        string `json:"id"`
+	PubKey    string `json:"pubkey"`
+	CreatedAt int    `json:"created_at"`
+	Kind      int    `json:"kind"`
+	Tags      []Tag  `json:"tags"`
+	Content   string `json:"content"`
+	Sig       string `json:"sig"`
+}
+
+var (
+	// Hex64Pattern matches 64-character, lowercase, hexadecimal strings.
+	// Used for validating event IDs and cryptographic keys.
+	Hex64Pattern = regexp.MustCompile("^[a-f0-9]{64}$")
+
+	// Hex128Pattern matches 128-character, lowercase, hexadecimal strings.
+	// Used for validating signatures.
+	Hex128Pattern = regexp.MustCompile("^[a-f0-9]{128}$")
+)