luci-proto-wireguard: Add generate key button

Signed-off-by: Wojciech Jowsa <wojciech.jowsa@gmail.com>
[minor indentation fix, use bound section_id value, remove empty translation]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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

@@ -1,8 +1,16 @@
 'use strict';
+'require ui';
 'require uci';
+'require rpc';
 'require form';
 'require network';
 
+var generateKey = rpc.declare({
+	object: 'luci.wireguard',
+	method: 'generateKeyPair',
+	expect: { keys: {} }
+});
+
 function validateBase64(section_id, value) {
 	if (value.length == 0)
 		return true;
@@ -55,6 +63,18 @@ return network.registerProtocol('wireguard', {
 		o.validate = validateBase64;
 		o.rmempty = false;
 
+		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');
+
+				keyInput.value = keypair.priv || '';
+				keyInput.dispatchEvent(changeEvent);
+			});
+		}, s.section);
+
 		o = s.taboption('general', form.Value, 'listen_port', _('Listen Port'), _('Optional. UDP port used for outgoing and incoming packets.'));
 		o.datatype = 'port';
 		o.placeholder = _('random');

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

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+. /usr/share/libubox/jshn.sh
+
+case "$1" in
+	list)
+		json_init
+		json_add_object "generateKeyPair"
+		json_close_object
+		json_dump
+	;;
+	call)
+		case "$2" in
+			generateKeyPair)
+				prv=$(wg genkey)
+				pub=$(echo $prv | wg pubkey)
+				json_init
+				json_add_object "keys"
+				json_add_string "priv" "$prv"
+				json_add_string "pub" "$pub"
+				json_close_object
+				json_dump
+			;;
+		esac
+	;;
+esac

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

@@ -0,0 +1,10 @@
+{
+	"luci-proto-wireguard": {
+		"description": "Grant access to LuCI Wireguard procedures",
+		"write": {
+			"ubus": {
+				"luci.wireguard": [ "generateKeyPair" ]
+			}
+		}
+	}
+}