bolt12: remove deprecated chains fields

We also move recurrence fields into a separate spec patch.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

common/bolt12.c

@@ -8,11 +8,11 @@
 #include <secp256k1_schnorrsig.h>
 #include <time.h>
 
-bool bolt12_chains_match(const struct bitcoin_blkid *chains,
+/* If chains is NULL, max_num_chains is ignored */
+static bool bolt12_chains_match(const struct bitcoin_blkid *chains,
+				size_t max_num_chains,
 				const struct chainparams *must_be_chain)
 {
-	size_t num_chains;
-
 	/* BOLT-offers #12:
 	 *   - if the chain for the invoice is not solely bitcoin:
 	 *     - MUST specify `chains` the offer is valid for.
@@ -27,13 +27,12 @@ bool bolt12_chains_match(const struct bitcoin_blkid *chains,
 	 *  - otherwise:
 	 *    - MUST fail the request if `chain` is not a supported chain.
 	 */
-	num_chains = tal_count(chains);
-	if (num_chains == 0) {
-		num_chains = 1;
+	if (!chains) {
+		max_num_chains = 1;
 		chains = &chainparams_for_network("bitcoin")->genesis_blockhash;
 	}
 
-	for (size_t i = 0; i < num_chains; i++) {
+	for (size_t i = 0; i < max_num_chains; i++) {
 		if (bitcoin_blkid_eq(&chains[i],
 				     &must_be_chain->genesis_blockhash))
 			return true;
@@ -43,28 +42,20 @@ bool bolt12_chains_match(const struct bitcoin_blkid *chains,
 }
 
 bool bolt12_chain_matches(const struct bitcoin_blkid *chain,
-			  const struct chainparams *must_be_chain,
-			  const struct bitcoin_blkid *deprecated_chains)
+			  const struct chainparams *must_be_chain)
 {
-	/* Obsolete: We used to put an array in here, but we only ever
-	 * used a single value */
-	if (deprecated_apis && !chain)
-		chain = deprecated_chains;
-
-	if (!chain)
-		chain = &chainparams_for_network("bitcoin")->genesis_blockhash;
-
-	return bitcoin_blkid_eq(chain, &must_be_chain->genesis_blockhash);
+	return bolt12_chains_match(chain, 1, must_be_chain);
 }
 
 static char *check_features_and_chain(const tal_t *ctx,
 				      const struct feature_set *our_features,
 				      const struct chainparams *must_be_chain,
 				      const u8 *features,
-				      const struct bitcoin_blkid *chains)
+				      const struct bitcoin_blkid *chains,
+				      size_t num_chains)
 {
 	if (must_be_chain) {
-		if (!bolt12_chains_match(chains, must_be_chain))
+		if (!bolt12_chains_match(chains, num_chains, must_be_chain))
 			return tal_fmt(ctx, "wrong chain");
 	}
 
@@ -190,7 +181,8 @@ struct tlv_offer *offer_decode(const tal_t *ctx,
 	*fail = check_features_and_chain(ctx,
 					 our_features, must_be_chain,
 					 offer->features,
-					 offer->chains);
+					 offer->chains,
+					 tal_count(offer->chains));
 	if (*fail)
 		return tal_free(offer);
 
@@ -242,9 +234,7 @@ struct tlv_invoice_request *invrequest_decode(const tal_t *ctx,
 	*fail = check_features_and_chain(ctx,
 					 our_features, must_be_chain,
 					 invrequest->features,
-					 invrequest->chain
-					 ? invrequest->chain
-					 : invrequest->chains);
+					 invrequest->chain, 1);
 	if (*fail)
 		return tal_free(invrequest);
 
@@ -283,8 +273,7 @@ struct tlv_invoice *invoice_decode_nosig(const tal_t *ctx,
 	*fail = check_features_and_chain(ctx,
 					 our_features, must_be_chain,
 					 invoice->features,
-					 invoice->chain
-					 ? invoice->chain : invoice->chains);
+					 invoice->chain, 1);
 	if (*fail)
 		return tal_free(invoice);
 

common/bolt12.h

@@ -99,14 +99,9 @@ bool bolt12_check_signature(const struct tlv_field *fields,
 			    const struct point32 *key,
 			    const struct bip340sig *sig);
 
-/* Given a tal_arr of chains, does it contain this chain? */
-bool bolt12_chains_match(const struct bitcoin_blkid *chains,
-			 const struct chainparams *must_be_chain);
-
 /* Given a single bolt12 chain, does it match?  (NULL == bitcoin) */
 bool bolt12_chain_matches(const struct bitcoin_blkid *chain,
-			  const struct chainparams *must_be_chain,
-			  const struct bitcoin_blkid *deprecated_chains);
+			  const struct chainparams *must_be_chain);
 
 /* Given a basetime, when does period N start? */
 u64 offer_period_start(u64 basetime, size_t n,

plugins/fetchinvoice.c

@@ -1383,10 +1383,6 @@ static struct command_result *json_fetchinvoice(struct command *cmd,
 	 *   - the bitcoin chain is implied as the first and only entry.
 	 */
 	if (!streq(chainparams->network_name, "bitcoin")) {
-		if (deprecated_apis) {
-			invreq->chains = tal_arr(invreq, struct bitcoin_blkid, 1);
-			invreq->chains[0] = chainparams->genesis_blockhash;
-		}
 		invreq->chain = tal_dup(invreq, struct bitcoin_blkid,
 					&chainparams->genesis_blockhash);
 	}
@@ -1780,10 +1776,6 @@ static struct command_result *json_sendinvoice(struct command *cmd,
 	 *   - the bitcoin chain is implied as the first and only entry.
 	 */
 	if (!streq(chainparams->network_name, "bitcoin")) {
-		if (deprecated_apis) {
-			sent->inv->chains = tal_arr(sent->inv, struct bitcoin_blkid, 1);
-			sent->inv->chains[0] = chainparams->genesis_blockhash;
-		}
 		sent->inv->chain = tal_dup(sent->inv, struct bitcoin_blkid,
 					   &chainparams->genesis_blockhash);
 	}

plugins/offers.c

@@ -539,8 +539,6 @@ static void json_add_b12_invoice(struct json_stream *js,
 {
 	bool valid = true;
 
-	if (invoice->chains)
-		json_add_chains(js, invoice->chains);
 	if (invoice->chain)
 		json_add_sha256(js, "chain", &invoice->chain->shad.sha);
 	if (invoice->offer_id)
@@ -679,7 +677,7 @@ static void json_add_b12_invoice(struct json_stream *js,
 
 	if (invoice->fallbacks)
 		valid &= json_add_fallbacks(js,
-					    invoice->chain ? invoice->chain : invoice->chains,
+					    invoice->chain,
 					    invoice->fallbacks->fallbacks);
 
 	/* BOLT-offers #12:
@@ -726,8 +724,6 @@ static void json_add_invoice_request(struct json_stream *js,
 {
 	bool valid = true;
 
-	if (invreq->chains)
-		json_add_chains(js, invreq->chains);
 	if (invreq->chain)
 		json_add_sha256(js, "chain", &invreq->chain->shad.sha);
 

plugins/offers_inv_hook.c

@@ -359,9 +359,9 @@ struct command_result *handle_invoice(struct command *cmd,
 	 *   - otherwise:
 	 *     - MUST fail the request if `chain` is not a supported chain.
 	 */
-	if (!bolt12_chain_matches(inv->inv->chain, chainparams, inv->inv->chains)) {
+	if (!bolt12_chain_matches(inv->inv->chain, chainparams)) {
 		return fail_inv(cmd, inv,
-				"Wrong chains %s",
+				"Wrong chain %s",
 				tal_hex(tmpctx, inv->inv->chain));
 	}
 

plugins/offers_invreq_hook.c

@@ -754,10 +754,6 @@ static struct command_result *listoffers_done(struct command *cmd,
 	 *     - MUST specify `chains` the offer is valid for.
 	 */
 	if (!streq(chainparams->network_name, "bitcoin")) {
-		if (deprecated_apis) {
-			ir->inv->chains = tal_arr(ir->inv, struct bitcoin_blkid, 1);
-			ir->inv->chains[0] = chainparams->genesis_blockhash;
-		}
 		ir->inv->chain = tal_dup(ir->inv, struct bitcoin_blkid,
 					 &chainparams->genesis_blockhash);
 	}
@@ -875,8 +871,7 @@ struct command_result *handle_invoice_request(struct command *cmd,
 	 *  - otherwise:
 	 *    - MUST fail the request if `chain` is not a supported chain.
 	 */
-	if (!bolt12_chain_matches(ir->invreq->chain, chainparams,
-				  ir->invreq->chains)) {
+	if (!bolt12_chain_matches(ir->invreq->chain, chainparams)) {
 		return fail_invreq(cmd, ir,
 				   "Wrong chain %s",
 				   tal_hex(tmpctx, ir->invreq->chain));

wire/bolt12_exp_wire.csv

@@ -42,8 +42,6 @@ subtypedata,blinded_path,first_node_id,point,
 subtypedata,blinded_path,blinding,point,
 subtypedata,blinded_path,num_hops,byte,
 subtypedata,blinded_path,path,onionmsg_path,num_hops
-tlvtype,invoice_request,chains,2
-tlvdata,invoice_request,chains,chains,chain_hash,...
 tlvtype,invoice_request,chain,3
 tlvdata,invoice_request,chain,chain,chain_hash,
 tlvtype,invoice_request,offer_id,4
@@ -68,8 +66,6 @@ tlvtype,invoice_request,replace_invoice,56
 tlvdata,invoice_request,replace_invoice,payment_hash,sha256,
 tlvtype,invoice_request,payer_signature,240
 tlvdata,invoice_request,payer_signature,sig,bip340sig,
-tlvtype,invoice,chains,2
-tlvdata,invoice,chains,chains,chain_hash,...
 tlvtype,invoice,chain,3
 tlvdata,invoice,chain,chain,chain_hash,
 tlvtype,invoice,offer_id,4

wire/bolt12_wire.csv

@@ -42,8 +42,6 @@ subtypedata,blinded_path,first_node_id,point,
 subtypedata,blinded_path,blinding,point,
 subtypedata,blinded_path,num_hops,byte,
 subtypedata,blinded_path,path,onionmsg_path,num_hops
-tlvtype,invoice_request,chains,2
-tlvdata,invoice_request,chains,chains,chain_hash,...
 tlvtype,invoice_request,chain,3
 tlvdata,invoice_request,chain,chain,chain_hash,
 tlvtype,invoice_request,offer_id,4
@@ -68,8 +66,6 @@ tlvtype,invoice_request,replace_invoice,56
 tlvdata,invoice_request,replace_invoice,payment_hash,sha256,
 tlvtype,invoice_request,payer_signature,240
 tlvdata,invoice_request,payer_signature,sig,bip340sig,
-tlvtype,invoice,chains,2
-tlvdata,invoice,chains,chains,chain_hash,...
 tlvtype,invoice,chain,3
 tlvdata,invoice,chain,chain,chain_hash,
 tlvtype,invoice,offer_id,4

wire/extracted_bolt12_01_recurrence.patch

@@ -0,0 +1,48 @@
+diff --git b/wire/bolt12_wire.csv a/wire/bolt12_wire.csv
+index 726c3c0a1..a53ca3cdf 100644
+--- b/wire/bolt12_wire.csv
++++ a/wire/bolt12_wire.csv
+@@ -18,6 +18,18 @@ tlvtype,offer,quantity_min,22
+ tlvdata,offer,quantity_min,min,tu64,
+ tlvtype,offer,quantity_max,24
+ tlvdata,offer,quantity_max,max,tu64,
++tlvtype,offer,recurrence,26
++tlvdata,offer,recurrence,time_unit,byte,
++tlvdata,offer,recurrence,period,tu32,
++tlvtype,offer,recurrence_paywindow,64
++tlvdata,offer,recurrence_paywindow,seconds_before,u32,
++tlvdata,offer,recurrence_paywindow,proportional_amount,byte,
++tlvdata,offer,recurrence_paywindow,seconds_after,tu32,
++tlvtype,offer,recurrence_limit,66
++tlvdata,offer,recurrence_limit,max_period,tu32,
++tlvtype,offer,recurrence_base,28
++tlvdata,offer,recurrence_base,start_any_period,byte,
++tlvdata,offer,recurrence_base,basetime,tu64,
+ tlvtype,offer,node_id,30
+ tlvdata,offer,node_id,node_id,point32,
+ tlvtype,offer,send_invoice,54
+@@ -40,6 +54,10 @@ tlvtype,invoice_request,features,12
+ tlvdata,invoice_request,features,features,byte,...
+ tlvtype,invoice_request,quantity,32
+ tlvdata,invoice_request,quantity,quantity,tu64,
++tlvtype,invoice_request,recurrence_counter,36
++tlvdata,invoice_request,recurrence_counter,counter,tu32,
++tlvtype,invoice_request,recurrence_start,68
++tlvdata,invoice_request,recurrence_start,period_offset,tu32,
+ tlvtype,invoice_request,payer_key,38
+ tlvdata,invoice_request,payer_key,key,point32,
+ tlvtype,invoice_request,payer_note,39
+@@ -74,6 +94,13 @@ tlvtype,invoice,quantity,32
+ tlvdata,invoice,quantity,quantity,tu64,
+ tlvtype,invoice,refund_for,34
+ tlvdata,invoice,refund_for,refunded_payment_hash,sha256,
++tlvtype,invoice,recurrence_counter,36
++tlvdata,invoice,recurrence_counter,counter,tu32,
++tlvtype,invoice,send_invoice,54
++tlvtype,invoice,recurrence_start,68
++tlvdata,invoice,recurrence_start,period_offset,tu32,
++tlvtype,invoice,recurrence_basetime,64
++tlvdata,invoice,recurrence_basetime,basetime,tu64,
+ tlvtype,invoice,payer_key,38
+ tlvdata,invoice,payer_key,key,point32,
+ tlvtype,invoice,payer_note,39