Function add_stub_blindedpath

lightningd/invoice.c:1619–1670

This is only if we're a public node; otherwise, the offers plugin * will have populated a real blinded path */

/* This is only if we're a public node; otherwise, the offers plugin
 * will have populated a real blinded path */
static void add_stub_blindedpath(const tal_t *ctx,
				 struct lightningd *ld,
				 struct tlv_invoice *inv)
{
	struct blinded_path *path;
	struct privkey path_key;
	struct tlv_encrypted_data_tlv *tlv;

	path = tal(NULL, struct blinded_path);
	sciddir_or_pubkey_from_pubkey(&path->first_node_id, &ld->our_pubkey);
	randbytes(&path_key, sizeof(path_key));
	if (!pubkey_from_privkey(&path_key, &path->first_path_key))
		abort();
	path->path = tal_arr(path, struct blinded_path_hop *, 1);
	path->path[0] = tal(path->path, struct blinded_path_hop);

	/* A message in a bottle to ourselves: match it with
	 * the invoice: we assume the payment_hash is unique! */
	tlv = tlv_encrypted_data_tlv_new(tmpctx);
	tlv->path_id = bolt12_path_id(inv,
				      &ld->invoicesecret_base,
				      inv->invoice_payment_hash);

	path->path[0]->encrypted_recipient_data
		= encrypt_tlv_encrypted_data(path->path[0],
					     &path_key,
					     &path->first_node_id.pubkey,
					     tlv,
					     NULL,
					     &path->path[0]->blinded_node_id);

	inv->invoice_paths = tal_arr(inv, struct blinded_path *, 1);
	inv->invoice_paths[0] = tal_steal(inv->invoice_paths, path);

	/* BOLT #12:
	 *  - MUST include `invoice_paths` containing one or more paths to the node.
	 *  - MUST specify `invoice_paths` in order of most-preferred to least-preferred if it has a preference.
	 *  - MUST include `invoice_blindedpay` with exactly one `blinded_payinfo` for each `blinded_path` in `paths`, in order.
	 */
	inv->invoice_blindedpay = tal_arr(inv, struct blinded_payinfo *, 1);
	inv->invoice_blindedpay[0] = tal(inv->invoice_blindedpay,
					 struct blinded_payinfo);
	inv->invoice_blindedpay[0]->fee_base_msat = 0;
	inv->invoice_blindedpay[0]->fee_proportional_millionths = 0;
	inv->invoice_blindedpay[0]->cltv_expiry_delta = ld->config.cltv_final;
	inv->invoice_blindedpay[0]->htlc_minimum_msat = AMOUNT_MSAT(0);
	inv->invoice_blindedpay[0]->htlc_maximum_msat = AMOUNT_MSAT(21000000 * MSAT_PER_BTC);
	inv->invoice_blindedpay[0]->features = NULL;

	/* Recalc ->fields */
	tlv_update_fields(inv, tlv_invoice, &inv->fields);
}

static struct command_result *json_createinvoice(struct command *cmd,
						 const char *buffer,