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plugins/libplugin-pay: hack in blinded path support.

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We simply take the first one, and route to the start of that.  Then we
append the blinded path to the onion construction.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2022-11-09 12:00:10 +10:30
committed by Christian Decker
parent 8720bbedae
commit 01a47720c3
6 changed files with 114 additions and 15 deletions
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50
plugins/pay.c
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@@ -1024,6 +1024,9 @@ static struct command_result *json_pay(struct command *cmd,
p = payment_new(cmd, cmd, NULL /* No parent */, paymod_mods);
p->invstring = tal_steal(p, b11str);
p->description = tal_steal(p, description);
/* Overridded by bolt12 if present */
p->blindedpath = NULL;
p->blindedpay = NULL;
if (!bolt12_has_prefix(b11str)) {
b11 =
@@ -1085,7 +1088,9 @@ static struct command_result *json_pay(struct command *cmd,
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"experimental-offers disabled");
p->features = tal_steal(p, b12->features);
/* FIXME: We disable MPP for now */
/* p->features = tal_steal(p, b12->features); */
p->features = NULL;
if (!b12->node_id)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
@@ -1109,8 +1114,33 @@ static struct command_result *json_pay(struct command *cmd,
return command_fail(
cmd, JSONRPC2_INVALID_PARAMS,
"recurring invoice requires a label");
/* FIXME payment_secret should be signature! */
{
/* BOLT-offers #12:
* - MUST reject the invoice if `blindedpay` is not present.
*/
/* FIXME: We allow this for now. */
if (tal_count(b12->paths) != 0) {
/* BOLT-offers #12: - MUST reject the invoice if
* `blindedpay` does not contain exactly one
* `blinded_payinfo` per `blinded_path`.
*/
if (tal_count(b12->paths) != tal_count(b12->blindedpay)) {
return command_fail(
cmd, JSONRPC2_INVALID_PARAMS,
"Wrong blinding info: %zu paths, %zu payinfo",
tal_count(b12->paths),
tal_count(b12->blindedpay));
}
/* FIXME: do MPP across these! We choose first one. */
p->blindedpath = tal_steal(p, b12->paths[0]);
p->blindedpay = tal_steal(p, b12->blindedpay[0]);
/* Set destination to introduction point */
node_id_from_pubkey(p->destination, &p->blindedpath->first_node_id);
} else {
/* FIXME payment_secret should be signature! */
struct sha256 merkle;
p->payment_secret = tal(p, struct secret);
@@ -1121,7 +1151,6 @@ static struct command_result *json_pay(struct command *cmd,
}
p->payment_metadata = NULL;
p->routes = NULL;
/* FIXME: paths! */
if (b12->cltv)
p->min_final_cltv_expiry = *b12->cltv;
else
@@ -1161,6 +1190,19 @@ static struct command_result *json_pay(struct command *cmd,
p->amount = *msat;
}
/* We replace real final values if we're using a blinded path */
if (p->blindedpath) {
p->blindedfinalcltv = p->min_final_cltv_expiry;
p->blindedfinalamount = p->amount;
p->min_final_cltv_expiry += p->blindedpay->cltv_expiry_delta;
if (!amount_msat_add_fee(&p->amount,
p->blindedpay->fee_base_msat,
p->blindedpay->fee_proportional_millionths))
return command_fail(cmd, PAY_ROUTE_TOO_EXPENSIVE,
"This payment blinded path fee overflows!");
}
if (node_id_eq(&my_id, p->destination))
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"This payment is destined for ourselves. "