luci-proto-wireguard: display interface public key

Signed-off-by: Paul Dee <itsascambutmailmeanyway@gmail.com>

protocols/luci-proto-wireguard/htdocs/luci-static/resources/protocol/wireguard.js

@@ -11,6 +11,13 @@ var generateKey = rpc.declare({
 	expect: { keys: {} }
 });
 
+var getPublicAndPrivateKeyFromPrivate = rpc.declare({
+	object: 'luci.wireguard',
+	method: 'getPublicAndPrivateKeyFromPrivate',
+	params: ['privkey'],
+	expect: { keys: {} }
+});
+
 var generateQrCode = rpc.declare({
 	object: 'luci.wireguard',
 	method: 'generateQrCode',
@@ -88,14 +95,34 @@ return network.registerProtocol('wireguard', {
 		o.validate = validateBase64;
 		o.rmempty = false;
 
+		var sections = uci.sections('network');
+		var serverName = this.getIfname();
+		var server = findSection(sections, serverName);
+
+		o = s.taboption('general', form.Value, 'public_key', _('Public Key'), _('Base64-encoded public key of this interface for sharing.'));
+		o.rmempty = false;
+		o.write = function() {/* write nothing */};
+
+		o.load = function(s) {
+			return getPublicAndPrivateKeyFromPrivate(server.private_key).then(
+				function(keypair) {
+					return keypair.pub || '';
+				}, 
+				function(error){
+					return _('Error getting PublicKey');
+			}, this)
+		};
+
 		o = s.taboption('general', form.Button, 'generate_key', _('Generate Key'));
 		o.inputstyle = 'apply';
 		o.onclick = ui.createHandlerFn(this, function(section_id, ev) {
 			 return generateKey().then(function(keypair) {
 				var keyInput = document.getElementById('widget.cbid.network.%s.private_key'.format(section_id)),
-				    changeEvent = new Event('change');
+					changeEvent = new Event('change'),
+					pubKeyInput = document.getElementById('widget.cbid.network.%s.public_key'.format(section_id));
 
 				keyInput.value = keypair.priv || '';
+				pubKeyInput.value = keypair.pub || '';
 				keyInput.dispatchEvent(changeEvent);
 			});
 		}, s.section);

protocols/luci-proto-wireguard/root/usr/libexec/rpcd/luci.wireguard

@@ -16,6 +16,14 @@ local methods = {
 			return {keys = {priv = prv, pub = pub}}
 		end
 	},
+	getPublicAndPrivateKeyFromPrivate = {
+		args = {privkey = "privkey"},
+		call = function(args)
+			local pubkey = sys.exec("echo %s | wg pubkey 2>/dev/null" % util.shellquote(args.privkey)):sub(1, -2)
+
+			return {keys = {priv = args.privkey, pub = pubkey}}
+		end
+	},
 	generateQrCode = {
 		args = {privkey = "privkey", psk = "psk", allowed_ips = {"allowed_ips"}},
 		call = function(args)

protocols/luci-proto-wireguard/root/usr/share/rpcd/acl.d/luci-wireguard.json

@@ -5,6 +5,7 @@
 			"ubus": {
 				"luci.wireguard": [
 					"generateKeyPair",
+					"getPublicAndPrivateKeyFromPrivate",
 					"generateQrCode"
 				]
 			}