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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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61
plugins/libplugin-pay.c
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@@ -1,6 +1,7 @@
#include "config.h"
#include <ccan/array_size/array_size.h>
#include <ccan/tal/str/str.h>
#include <common/blindedpay.h>
#include <common/dijkstra.h>
#include <common/gossmap.h>
#include <common/json_stream.h>
@@ -1662,6 +1663,33 @@ static void payment_add_hop_onion_payload(struct payment *p,
}
}
static void payment_add_blindedpath(const tal_t *ctx,
struct createonion_hop *hops,
const struct blinded_path *bpath,
struct amount_msat final_amt,
u32 final_cltv)
{
/* It's a bit of a weird API for us, so we convert it back to
* the struct tlv_tlv_payload */
u8 **tlvs = blinded_onion_hops(tmpctx, final_amt, final_cltv, bpath);
for (size_t i = 0; i < tal_count(tlvs); i++) {
const u8 *cursor = tlvs[i];
size_t max = tal_bytelen(tlvs[i]);
/* First one has to use real node_id */
if (i == 0)
node_id_from_pubkey(&hops[i].pubkey,
&bpath->first_node_id);
else
node_id_from_pubkey(&hops[i].pubkey,
&bpath->path[i]->blinded_node_id);
/* Length is prepended, discard that first! */
fromwire_bigsize(&cursor, &max);
hops[i].tlv_payload = fromwire_tlv_tlv_payload(ctx, &cursor, &max);
}
}
static void payment_compute_onion_payloads(struct payment *p)
{
struct createonion_request *cr;
@@ -1690,7 +1718,9 @@ static void payment_compute_onion_payloads(struct payment *p)
cr->assocdata = tal_arr(cr, u8, 0);
towire_sha256(&cr->assocdata, p->payment_hash);
cr->session_key = NULL;
cr->hops = tal_arr(cr, struct createonion_hop, tal_count(p->route));
cr->hops = tal_arr(cr, struct createonion_hop,
tal_count(p->route)
+ (root->blindedpath ? tal_count(root->blindedpath->path) - 1: 0));
/* Non-final hops */
for (size_t i = 0; i < hopcount - 1; i++) {
@@ -1704,14 +1734,27 @@ static void payment_compute_onion_payloads(struct payment *p)
&p->route[i].scid));
}
/* Final hop */
payment_add_hop_onion_payload(
p, &cr->hops[hopcount - 1], &p->route[hopcount - 1],
&p->route[hopcount - 1], true,
root->payment_secret, root->payment_metadata);
tal_append_fmt(&routetxt, "%s",
type_to_string(tmpctx, struct short_channel_id,
&p->route[hopcount - 1].scid));
/* If we're headed to a blinded path, connect that now. */
if (root->blindedpath) {
payment_add_blindedpath(cr->hops, cr->hops + hopcount - 1,
root->blindedpath,
root->blindedfinalamount,
root->blindedfinalcltv);
tal_append_fmt(&routetxt, "%s -> blinded path (%zu hops)",
type_to_string(tmpctx, struct short_channel_id,
&p->route[hopcount-1].scid),
tal_count(root->blindedpath->path));
} else {
/* Final hop */
payment_add_hop_onion_payload(
p, &cr->hops[hopcount - 1], &p->route[hopcount - 1],
&p->route[hopcount - 1], true,
root->payment_secret,
root->payment_metadata);
tal_append_fmt(&routetxt, "%s",
type_to_string(tmpctx, struct short_channel_id,
&p->route[hopcount - 1].scid));
}
paymod_log(p, LOG_DBG,
"Created outgoing onion for route: %s", routetxt);