mail: add API to get/set banner

part of #341

src/maildb.js

@@ -17,7 +17,7 @@ var assert = require('assert'),
     database = require('./database.js'),
     safe = require('safetydance');
 
-var MAILDB_FIELDS = [ 'domain', 'enabled', 'mailFromValidation', 'catchAllJson', 'relayJson', 'dkimSelector' ].join(',');
+var MAILDB_FIELDS = [ 'domain', 'enabled', 'mailFromValidation', 'catchAllJson', 'relayJson', 'dkimSelector', 'bannerJson' ].join(',');
 
 function postProcess(data) {
     data.enabled = !!data.enabled; // int to boolean
@@ -29,6 +29,9 @@ function postProcess(data) {
     data.relay = safe.JSON.parse(data.relayJson) || { provider: 'cloudron-smtp' };
     delete data.relayJson;
 
+    data.banner = safe.JSON.parse(data.bannerJson) || { text: null, html: null };
+    delete data.bannerJson;
+
     return data;
 }
 
@@ -74,8 +77,8 @@ function update(domain, data, callback) {
     var args = [ ];
     var fields = [ ];
     for (var k in data) {
-        if (k === 'catchAll') {
-            fields.push('catchAllJson = ?');
+        if (k === 'catchAll' || k === 'banner') {
+            fields.push(`${k}Json = ?`);
             args.push(JSON.stringify(data[k]));
         } else if (k === 'relay') {
             fields.push('relayJson = ?');