Function json_signpsbt

wallet/walletrpc.c:805–899

}

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;
	const struct hsm_utxo **hsm_utxos;
	u32 *input_nums;
	u32 psbt_version;

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

	/* We internally deal with v2 only but we want to return V2 if given */
	psbt_version = psbt->version;
	if (!psbt_set_version(psbt, 2)) {
		return command_fail(cmd, LIGHTNINGD,
				    "Could not set PSBT version: %s",
					 fmt_wally_psbt(tmpctx, psbt));
	}

	/* 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. Are you sure you"
				    " added inputs to this PSBT? If not, then"
				    " there is no need to sign it.");

	if (command_check_only(cmd))
		return command_check_done(cmd);

	/* Update the keypaths on any outputs that are in our wallet (change addresses). */
	if (!match_psbt_outputs_to_wallet(psbt, cmd->ld->wallet))
		return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
				    "Could not add keypaths to PSBT?");

	/* FIXME: hsm will sign almost anything, but it should really