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xpay-handle-pay: bugfix, handle null parameters #7958

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xpay-handle-pay: bugfix, handle null parameters #7958

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9e1f00b
xpay-handle-pay: bugfix, handle null parameters
Lagrang3 Dec 19, 2024
684fc04
xpay-handle-pay: don't assume bolt11 is non NULL
Lagrang3 Dec 19, 2024
4470fa3
xpay-handle-pay: test null params
Lagrang3 Dec 19, 2024
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37 changes: 23 additions & 14 deletions plugins/xpay/xpay.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1888,6 +1888,9 @@ static struct command_result *handle_rpc_command(struct command *cmd,
const char *maxfee = NULL;
struct json_stream *response;

/* pay extra params */
const jsmntok_t *maxfeepercent = NULL, *exemptfee = NULL;

if (!xpay->take_over_pay)
goto dont_redirect;

Expand All @@ -1914,8 +1917,14 @@ static struct command_result *handle_rpc_command(struct command *cmd,
bolt11 = params_tok + 1;
if (params_tok->size == 2)
amount_msat = json_next(bolt11);

/* some arguments could have null values in the list */
if (bolt11 && json_tok_is_null(buf, bolt11))
bolt11 = NULL;
if (amount_msat && json_tok_is_null(buf, amount_msat))
amount_msat = NULL;
} else if (params_tok->type == JSMN_OBJECT) {
const jsmntok_t *t, *maxfeepercent = NULL, *exemptfee = NULL;
const jsmntok_t *t;
size_t i;

json_for_each_obj(i, t, params_tok) {
Expand All @@ -1941,25 +1950,25 @@ static struct command_result *handle_rpc_command(struct command *cmd,
goto dont_redirect;
}
}
if (!bolt11) {
plugin_log(cmd->plugin, LOG_INFORM,
"Not redirecting pay (missing bolt11 parameter)");
goto dont_redirect;
}
/* If this returns NULL, we let pay handle the weird case */
if (!calc_maxfee(cmd, &maxfee, buf,
bolt11, amount_msat,
exemptfee, maxfeepercent)) {
plugin_log(cmd->plugin, LOG_INFORM,
"Not redirecting pay (weird maxfee params)");
goto dont_redirect;
}
} else {
plugin_log(cmd->plugin, LOG_INFORM,
"Not redirecting pay (unexpected params type)");
goto dont_redirect;
}

if (!bolt11) {
plugin_log(cmd->plugin, LOG_INFORM,
"Not redirecting pay (missing bolt11 parameter)");
goto dont_redirect;
}
/* If this returns NULL, we let pay handle the weird case */
if (!calc_maxfee(cmd, &maxfee, buf, bolt11, amount_msat, exemptfee,
maxfeepercent)) {
plugin_log(cmd->plugin, LOG_INFORM,
"Not redirecting pay (weird maxfee params)");
goto dont_redirect;
}

plugin_log(cmd->plugin, LOG_INFORM, "Redirecting pay->xpay");
response = jsonrpc_stream_success(cmd);
json_object_start(response, "replace");
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23 changes: 23 additions & 0 deletions tests/test_xpay.py
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Original file line number Diff line number Diff line change
Expand Up @@ -485,6 +485,29 @@ def test_xpay_takeover(node_factory, executor):
l1.daemon.wait_for_log('Converted maxfeepercent=0.25, exemptfee=UNSET to maxfee 5000msat')


def test_xpay_takeover_null_parms(node_factory, executor):
"""Test passing through RPC a list of parameters some of which have null
json value."""
l1, l2, l3 = node_factory.line_graph(
3, wait_for_announce=True, opts={"xpay-handle-pay": True}
)

# Amount argument is null.
inv = l3.rpc.invoice(100000, "test_xpay_takeover1", "test_xpay_takeover1")["bolt11"]
l1.rpc.call("pay", [inv, None])
l1.daemon.wait_for_log("Redirecting pay->xpay")

# Amount argument is given
inv = l3.rpc.invoice("any", "test_xpay_takeover2", "test_xpay_takeover2")["bolt11"]
l1.rpc.call("pay", [inv, "100sat"])
l1.daemon.wait_for_log("Redirecting pay->xpay")

# bolt11 invoice cannot be NULL
with pytest.raises(RpcError, match=r"missing required parameter: bolt11"):
l1.rpc.call("pay", [None, "100sat"])
l1.daemon.wait_for_log(r"Not redirecting pay \(missing bolt11 parameter\)")


def test_xpay_preapprove(node_factory):
l1, l2 = node_factory.line_graph(2, opts={'dev-hsmd-fail-preapprove': None})

Expand Down
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