nip61, and related modifications to nip60.

nip60/send-external.go

@@ -0,0 +1,36 @@
+package nip60
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/elnosh/gonuts/cashu"
+	"github.com/elnosh/gonuts/cashu/nuts/nut04"
+	"github.com/nbd-wtf/go-nostr/nip60/client"
+)
+
+func (w *Wallet) SendExternal(
+	ctx context.Context,
+	mint string,
+	targetAmount uint64,
+	opts ...SendOption,
+) (cashu.Proofs, error) {
+	if w.wl.PublishUpdate == nil {
+		return nil, fmt.Errorf("can't do write operations: missing PublishUpdate function")
+	}
+
+	// get the invoice from target mint
+	mintResp, err := client.PostMintQuoteBolt11(ctx, mint, nut04.PostMintQuoteBolt11Request{
+		Unit:   cashu.Sat.String(),
+		Amount: targetAmount,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("failed to generate mint quote: %w", err)
+	}
+
+	if _, err := w.PayBolt11(ctx, mintResp.Request, opts...); err != nil {
+		return nil, err
+	}
+
+	return redeemMinted(ctx, mint, mintResp.Quote, targetAmount)
+}