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fetchinvoice: don't consider "msat" a change if fetchinvoice specified it.

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We don't automatically *reject* an invoice which asks for a different
msat than we specified (caller may!), but we don't bother noting it
unless it is different.

Reported-by: @shesek
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2021-07-21 15:07:39 +09:30 • committed by neil saitug
parent 0a0b2ce940
commit 57cc4e3c34
2 changed files with 14 additions and 2 deletions
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7
plugins/fetchinvoice.c
View file

@ -253,8 +253,11 @@ static struct command_result *handle_invreq_response(struct command *cmd,
if ((badfield = field_diff(sent->invreq, inv, payer_info)))
goto badinv;
/* Get the amount we expected. */
if (sent->offer->amount && !sent->offer->currency) {
/* Get the amount we expected: firstly, if that's what we sent,
* secondly, if specified in the invoice. */
if (sent->invreq->amount) {
expected_amount = tal_dup(tmpctx, u64, sent->invreq->amount);
} else if (sent->offer->amount && !sent->offer->currency) {
expected_amount = tal(tmpctx, u64);
*expected_amount = *sent->offer->amount;

9
tests/test_pay.py
View file

@ -4158,6 +4158,15 @@ def test_fetchinvoice(node_factory, bitcoind):
with pytest.raises(RpcError, match="Remote node sent failure message.*Amount must be at least 2msat"):
l1.rpc.call('fetchinvoice', {'offer': offer1['bolt12'], 'msatoshi': 1})
# If no amount is specified in offer, one must be in invoice.
offer_noamount = l3.rpc.call('offer', {'amount': 'any',
'description': 'any amount test'})
with pytest.raises(RpcError, match="msatoshi parameter required"):
l1.rpc.call('fetchinvoice', {'offer': offer_noamount['bolt12']})
inv1 = l1.rpc.call('fetchinvoice', {'offer': offer_noamount['bolt12'], 'msatoshi': 100})
# But amount won't appear in changes
assert 'msat' not in inv1['changes']
# Single-use invoice can be fetched multiple times, only paid once.
offer2 = l3.rpc.call('offer', {'amount': '1msat',
'description': 'single-use test',