newaddr: support getting both bech32 and p2sh addresses.

Higher layers consume less addresses this way.

Fixes: #2390
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- JSON API: `newaddr` outputs `bech32` or `p2sh-segwit`, or both with new `all` parameter (#2390)
+
 ### Changed
 
 ### Deprecated

doc/lightning-newaddr.7

@@ -2,12 +2,12 @@
 .\"     Title: lightning-newaddr
 .\"    Author: [see the "AUTHOR" section]
 .\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
-.\"      Date: 07/23/2018
+.\"      Date: 02/23/2019
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "LIGHTNING\-NEWADDR" "7" "07/23/2018" "\ \&" "\ \&"
+.TH "LIGHTNING\-NEWADDR" "7" "02/23/2019" "\ \&" "\ \&"
 .\" -----------------------------------------------------------------
 .\" * Define some portability stuff
 .\" -----------------------------------------------------------------
@@ -38,12 +38,12 @@ The \fBnewaddr\fR RPC command generates a new address which can subsequently be
 .sp
 The funding transaction needs to be confirmed before funds can be used\&.
 .sp
-\fIaddresstype\fR specifies the type of address wanted; i\&.e\&. p2sh\-segwit (e\&.g\&. 2MxaozoqWwiUcuD9KKgUSrLFDafLqimT9Ta on bitcoin testnet or 3MZxzq3jBSKNQ2e7dzneo9hy4FvNzmMmt3 on bitcoin mainnet) or bech32 (e\&.g\&. tb1qu9j4lg5f9rgjyfhvfd905vw46eg39czmktxqgg on bitcoin testnet or bc1qwqdg6squsna38e46795at95yu9atm8azzmyvckulcc7kytlcckxswvvzej on bitcoin mainnet)\&.
+\fIaddresstype\fR specifies the type of address wanted; i\&.e\&. \fIp2sh\-segwit\fR (e\&.g\&. 2MxaozoqWwiUcuD9KKgUSrLFDafLqimT9Ta on bitcoin testnet or 3MZxzq3jBSKNQ2e7dzneo9hy4FvNzmMmt3 on bitcoin mainnet) or \fIbech32 \*(Aq (e\&.g\&. tb1qu9j4lg5f9rgjyfhvfd905vw46eg39czmktxqgg on bitcoin testnet or bc1qwqdg6squsna38e46795at95yu9atm8azzmyvckulcc7kytlcckxswvvzej on bitcoin mainnet)\&. The special value \*(Aqall\fR generates both address types for the same underlying key\&.
 .sp
 If not specified the address generated is bech32\&.
 .SH "RETURN VALUE"
 .sp
-On success, a new address will be returned\&.
+On success, a \fIbech32\fR address and/or a \fIp2sh\-segwit\fR address will be returned\&.
 .SH "ERRORS"
 .sp
 If an unrecognized address type is requested an error message will be returned\&.

doc/lightning-newaddr.7.txt

@@ -19,16 +19,17 @@ subsequently be used to fund channels managed by the c-lightning node.
 The funding transaction needs to be confirmed before funds can be used. 
 
 'addresstype' specifies the type of address wanted; i.e.
-p2sh-segwit (e.g. 2MxaozoqWwiUcuD9KKgUSrLFDafLqimT9Ta on bitcoin testnet 
-or 3MZxzq3jBSKNQ2e7dzneo9hy4FvNzmMmt3 on bitcoin mainnet) or bech32 
+'p2sh-segwit' (e.g. 2MxaozoqWwiUcuD9KKgUSrLFDafLqimT9Ta on bitcoin testnet 
+or 3MZxzq3jBSKNQ2e7dzneo9hy4FvNzmMmt3 on bitcoin mainnet) or 'bech32 '
 (e.g. tb1qu9j4lg5f9rgjyfhvfd905vw46eg39czmktxqgg on bitcoin testnet or 
 bc1qwqdg6squsna38e46795at95yu9atm8azzmyvckulcc7kytlcckxswvvzej on bitcoin mainnet).
+The special value 'all' generates both address types for the same underlying key.
 
 If not specified the address generated is bech32.
 
 RETURN VALUE
 ------------
-On success, a new address will be returned.
+On success, a 'bech32' address and/or a 'p2sh-segwit' address will be returned.
 
 ERRORS
 ------

tests/test_misc.py

@@ -1232,3 +1232,16 @@ def test_bad_onion(node_factory, bitcoind):
     assert err.value.error['data']['failcode'] == WIRE_INVALID_ONION_HMAC
     assert err.value.error['data']['erring_node'] == mangled_nodeid
     assert err.value.error['data']['erring_channel'] == route[1]['channel']
+
+
+def test_newaddr(node_factory):
+    l1 = node_factory.get_node()
+    p2sh = l1.rpc.newaddr('p2sh-segwit')
+    assert 'bech32' not in p2sh
+    assert p2sh['p2sh-segwit'].startswith('2')
+    bech32 = l1.rpc.newaddr('bech32')
+    assert 'p2sh-segwit' not in bech32
+    assert bech32['bech32'].startswith('bcrt1')
+    both = l1.rpc.newaddr('all')
+    assert both['p2sh-segwit'].startswith('2')
+    assert both['bech32'].startswith('bcrt1')

wallet/walletrpc.c

@@ -266,25 +266,31 @@ encode_scriptpubkey_to_addr(const tal_t *ctx,
 	return out;
 }
 
-/* Extract a bool indicating "p2sh-segwit" or "bech32" */
+enum addrtype {
+	ADDR_P2SH_SEGWIT = 1,
+	ADDR_BECH32 = 2,
+	ADDR_ALL = (ADDR_P2SH_SEGWIT + ADDR_BECH32)
+};
+
+/* Extract  bool indicating "p2sh-segwit" or "bech32" */
 static struct command_result *param_newaddr(struct command *cmd,
 					    const char *name,
 					    const char *buffer,
 					    const jsmntok_t *tok,
-					    bool **is_p2wpkh)
+					    enum addrtype **addrtype)
 {
-	*is_p2wpkh = tal(cmd, bool);
-	if (json_tok_streq(buffer, tok, "p2sh-segwit")) {
-		**is_p2wpkh = false;
-		return NULL;
-	}
-	if (json_tok_streq(buffer, tok, "bech32")) {
-		**is_p2wpkh = true;
-		return NULL;
-	}
-	return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
-			    "'%s' should be 'bech32' or 'p2sh-segwit', not '%.*s'",
-			    name, tok->end - tok->start, buffer + tok->start);
+	*addrtype = tal(cmd, enum addrtype);
+	if (json_tok_streq(buffer, tok, "p2sh-segwit"))
+		**addrtype = ADDR_P2SH_SEGWIT;
+	else if (json_tok_streq(buffer, tok, "bech32"))
+		**addrtype = ADDR_BECH32;
+	else if (json_tok_streq(buffer, tok, "all"))
+		**addrtype = ADDR_ALL;
+	else
+		return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
+				    "'%s' should be 'bech32', 'p2sh-segwit' or 'all', not '%.*s'",
+				    name, tok->end - tok->start, buffer + tok->start);
+	return NULL;
 }
 
 static struct command_result *json_newaddr(struct command *cmd,
@@ -295,12 +301,12 @@ static struct command_result *json_newaddr(struct command *cmd,
 	struct json_stream *response;
 	struct ext_key ext;
 	struct pubkey pubkey;
-	bool *is_p2wpkh;
+	enum addrtype *addrtype;
 	s64 keyidx;
-	char *out;
+	char *p2sh, *bech32;
 
 	if (!param(cmd, buffer, params,
-		   p_opt_def("addresstype", param_newaddr, &is_p2wpkh, true),
+		   p_opt_def("addresstype", param_newaddr, &addrtype, ADDR_BECH32),
 		   NULL))
 		return command_param_failed();
 
@@ -321,17 +327,20 @@ static struct command_result *json_newaddr(struct command *cmd,
 
 	txfilter_add_derkey(cmd->ld->owned_txfilter, ext.pub_key);
 
-	out = encode_pubkey_to_addr(cmd, cmd->ld,
-				    &pubkey, !*is_p2wpkh,
-				    NULL);
-	if (!out) {
+	p2sh = encode_pubkey_to_addr(cmd, cmd->ld, &pubkey, true, NULL);
+	bech32 = encode_pubkey_to_addr(cmd, cmd->ld, &pubkey, false, NULL);
+	if (!p2sh || !bech32) {
 		return command_fail(cmd, LIGHTNINGD,
 				    "p2wpkh address encoding failure.");
 	}
 
 	response = json_stream_success(cmd);
 	json_object_start(response, NULL);
-	json_add_string(response, "address", out);
+	json_add_string(response, "address", bech32 ? bech32 : p2sh);
+	if (*addrtype & ADDR_BECH32)
+		json_add_string(response, "bech32", bech32);
+	if (*addrtype & ADDR_P2SH_SEGWIT)
+		json_add_string(response, "p2sh-segwit", p2sh);
 	json_object_end(response);
 	return command_success(cmd, response);
 }
@@ -339,8 +348,8 @@ static struct command_result *json_newaddr(struct command *cmd,
 static const struct json_command newaddr_command = {
 	"newaddr",
 	json_newaddr,
-	"Get a new {bech32, p2sh-segwit} address to fund a channel (default is bech32)", false,
-	"Generates a new address that belongs to the internal wallet. Funds sent to these addresses will be managed by lightningd. Use `withdraw` to withdraw funds to an external wallet."
+	"Get a new {bech32, p2sh-segwit} (or all) address to fund a channel (default is bech32)", false,
+	"Generates a new address (or both) that belongs to the internal wallet. Funds sent to these addresses will be managed by lightningd. Use `withdraw` to withdraw funds to an external wallet."
 };
 AUTODATA(json_command, &newaddr_command);