Function json_signpsbt

wallet/walletrpc.c:739–799

}

static struct command_result *json_signpsbt(struct command *cmd,
					    const char *buffer,
					    const jsmntok_t *obj UNNEEDED,
					    const jsmntok_t *params)
{
	struct command_result *res;
	struct json_stream *response;
	struct wally_psbt *psbt, *signed_psbt;
	struct utxo **utxos;
	u32 *input_nums;

	if (!param(cmd, buffer, params,
		   p_req("psbt", param_psbt, &psbt),
		   p_opt("signonly", param_input_numbers, &input_nums),
		   NULL))
		return command_param_failed();

	/* Sanity check! */
	for (size_t i = 0; i < tal_count(input_nums); i++) {
		if (input_nums[i] >= psbt->num_inputs)
			return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
					    "signonly[%zu]: %u out of range",
					    i, input_nums[i]);
	}

	/* We have to find/locate the utxos that are ours on this PSBT,
	 * so that the HSM knows how/what to sign for (it's possible some of
	 * our utxos require more complicated data to sign for e.g.
	 * closeinfo outputs */
	res = match_psbt_inputs_to_utxos(cmd, psbt, input_nums, &utxos);
	if (res)
		return res;

	if (tal_count(utxos) == 0)
		return command_fail(cmd, LIGHTNINGD,
				    "No wallet inputs to sign");

	/* Update the keypaths on any outputs that are in our wallet (change addresses). */
	match_psbt_outputs_to_wallet(psbt, cmd->ld->wallet);

	/* FIXME: hsm will sign almost anything, but it should really
	 * fail cleanly (not abort!) and let us report the error here. */
	u8 *msg = towire_hsmd_sign_withdrawal(cmd,
					     cast_const2(const struct utxo **, utxos),
					     psbt);

	if (!wire_sync_write(cmd->ld->hsm_fd, take(msg)))
		fatal("Could not write sign_withdrawal to HSM: %s",
		      strerror(errno));

	msg = wire_sync_read(cmd, cmd->ld->hsm_fd);

	if (!fromwire_hsmd_sign_withdrawal_reply(cmd, msg, &signed_psbt))
		return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
				    "HSM gave bad sign_withdrawal_reply %s",
				    tal_hex(tmpctx, msg));

	response = json_stream_success(cmd);