Function found_best_peer_invrequest

plugins/offers_offer.c:680–737

};

static struct command_result *found_best_peer_invrequest(struct command *cmd,
							 const struct chaninfo *best,
							 struct invrequest_data *irdata)
{
	const struct offers_data *od = get_offers_data(cmd->plugin);

	if (!best) {
		/* Don't allow bare invoices if they explicitly told us to front */
		if (od->fronting_nodes) {
			return command_fail(cmd, LIGHTNINGD,
					    "Could not find neighbour fronting node");
		}

		/* FIXME: Make this a warning in the result! */
		plugin_log(cmd->plugin, LOG_UNUSUAL,
			   "No incoming channel to public peer, so no blinded path for invoice request");
	} else {
		struct pubkey *ids;
		struct secret blinding_path_secret;
		struct sha256 invreq_id;

		/* BOLT #12:
		 *   - MUST set `invreq_paths` as it would set (or not set) `offer_paths` for an offer.
		 */
		/* BOLT #12:
		 *
		 *   - if it is connected only by private channels:
		 *     - MUST include `offer_paths` containing one or more paths to the node from
		 *       publicly reachable nodes.
		 */
		/* Note: "id" of invreq minus paths (which we haven't added yet!) */
		invreq_invreq_id(irdata->invreq, &invreq_id);

		/* Make a small 1-hop path to us */
		ids = tal_arr(tmpctx, struct pubkey, 2);
		ids[0] = best->id;
		ids[1] = od->id;

		/* So we recognize this */
		/* We can check this when they try to take up invoice_request. */
		bolt12_path_secret(&od->offerblinding_base, &invreq_id,
				   &blinding_path_secret);

		plugin_log(cmd->plugin, LOG_DBG,
			   "Setting blinided path (invreq_id = %s, path_secret = %s)",
			   fmt_sha256(tmpctx, &invreq_id),
			   fmt_secret(tmpctx, &blinding_path_secret));
		irdata->invreq->invreq_paths = tal_arr(irdata->invreq, struct blinded_path *, 1);
		irdata->invreq->invreq_paths[0]
			= incoming_message_blinded_path(irdata->invreq->invreq_paths,
							ids,
							NULL,
							&blinding_path_secret);
	}

	return call_createinvoicerequest(cmd,
					 irdata->invreq, irdata->single_use, irdata->label);
}