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plugins/fetchinvoice: extract recurrence invreq_metadata routine.

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We're going to want this for cancelrecurringinvoice.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2025-09-29 13:20:44 +09:30
parent b30e063432
commit 551ecdf7ab
1 changed files with 29 additions and 24 deletions
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53
plugins/fetchinvoice.c
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@@ -818,6 +818,34 @@ static bool payer_key(const u8 *public_tweak, size_t public_tweak_len,
tweakhash.u.u8) == 1;
}
/* BOLT #12:
* - MUST set `invreq_metadata` to an unpredictable series of bytes.
*/
/* Derive metadata (and thus temp key) from offer data and label
* as payer_id must be same for all recurring payments. */
static u8 *recurrence_invreq_metadata(const tal_t *ctx,
const struct tlv_invoice_request *invreq,
const char *rec_label)
{
struct sha256 offer_id, tweak;
u8 *tweak_input;
/* Use "offer_id || label" as tweak input */
invreq_offer_id(invreq, &offer_id);
tweak_input = tal_arr(tmpctx, u8,
sizeof(offer_id) + strlen(rec_label));
memcpy(tweak_input, &offer_id, sizeof(offer_id));
memcpy(tweak_input + sizeof(offer_id),
rec_label,
strlen(rec_label));
bolt12_alias_tweak(&nodealias_base,
tweak_input,
tal_bytelen(tweak_input),
&tweak);
return (u8 *)tal_dup(invreq, struct sha256, &tweak);
}
/* Fetches an invoice for this offer, and makes sure it corresponds. */
struct command_result *json_fetchinvoice(struct command *cmd,
const char *buffer,
@@ -937,9 +965,6 @@ struct command_result *json_fetchinvoice(struct command *cmd,
* - if `offer_recurrence_optional` or `offer_recurrence_compulsory` are present:
*/
if (invreq_recurrence(invreq)) {
struct sha256 offer_id, tweak;
u8 *tweak_input;
/* BOLT-recurrence #12:
* - for the initial request:
*...
@@ -981,28 +1006,8 @@ struct command_result *json_fetchinvoice(struct command *cmd,
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"needs recurrence_label");
/* BOLT #12:
* - MUST set `invreq_metadata` to an unpredictable series of
* bytes.
*/
/* Derive metadata (and thus temp key) from offer data and label
* as payer_id must be same for all recurring payments. */
/* Use "offer_id || label" as tweak input */
invreq_offer_id(invreq, &offer_id);
tweak_input = tal_arr(tmpctx, u8,
sizeof(offer_id) + strlen(rec_label));
memcpy(tweak_input, &offer_id, sizeof(offer_id));
memcpy(tweak_input + sizeof(offer_id),
rec_label,
strlen(rec_label));
bolt12_alias_tweak(&nodealias_base,
tweak_input,
tal_bytelen(tweak_input),
&tweak);
invreq->invreq_metadata
= (u8 *)tal_dup(invreq, struct sha256, &tweak);
= recurrence_invreq_metadata(invreq, invreq, rec_label);
} else {
/* BOLT-recurrence #12:
* - otherwise: