nip61, and related modifications to nip60.

nip61/info.go

@@ -0,0 +1,61 @@
+package nip61
+
+import (
+	"context"
+	"slices"
+
+	"github.com/elnosh/gonuts/cashu"
+	"github.com/nbd-wtf/go-nostr"
+)
+
+type Info struct {
+	PublicKey string
+	Mints     []string
+	Relays    []string
+}
+
+func (zi *Info) toEvent(ctx context.Context, kr nostr.Keyer, evt *nostr.Event) error {
+	evt.CreatedAt = nostr.Now()
+	evt.Kind = 10019
+
+	evt.Tags = make(nostr.Tags, 0, len(zi.Mints)+len(zi.Relays)+1)
+	for _, mint := range zi.Mints {
+		evt.Tags = append(evt.Tags, nostr.Tag{"mint", mint})
+	}
+	for _, url := range zi.Relays {
+		evt.Tags = append(evt.Tags, nostr.Tag{"relay", url})
+	}
+	if zi.PublicKey != "" {
+		evt.Tags = append(evt.Tags, nostr.Tag{"pubkey", zi.PublicKey})
+	}
+
+	if err := kr.SignEvent(ctx, evt); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (zi *Info) parse(evt *nostr.Event) error {
+	zi.Mints = make([]string, 0)
+	for _, tag := range evt.Tags {
+		if len(tag) < 2 {
+			continue
+		}
+
+		switch tag[0] {
+		case "mint":
+			if len(tag) == 2 || slices.Contains(tag[2:], cashu.Sat.String()) {
+				zi.Mints = append(zi.Mints, "http"+nostr.NormalizeURL(tag[1])[2:])
+			}
+		case "relay":
+			zi.Relays = append(zi.Relays, tag[1])
+		case "pubkey":
+			if nostr.IsValidPublicKey(tag[1]) {
+				zi.PublicKey = tag[1]
+			}
+		}
+	}
+
+	return nil
+}