Basic support for Mosaico templates.

TODO:
- Allow choosing a mosaico template in a mosaico-based template
- Integrate the custom mosaico templates with templates (endpoint for retrieving a mosaico template, replacement of URL_BASE and PLACEHOLDER tags
- Implement support for MJML-based Mosaico templates
- Implement support for MJML-based templates
- Implement support for GrapeJS-based templates

client/src/templates/mosaico/helpers.js

@@ -0,0 +1,48 @@
+'use strict';
+
+import React from "react";
+import {ACEEditor} from "../../lib/form";
+import 'brace/mode/html'
+import 'brace/mode/xml'
+
+export function getTemplateTypes(t) {
+    const templateTypes = {};
+
+    function clearBeforeSend(data) {
+        delete data.html;
+        delete data.mjml;
+    }
+
+    templateTypes.html = {
+        typeName: t('HTML'),
+        getForm: owner => <ACEEditor id="html" height="700px" mode="html" label={t('Template content')}/>,
+        afterLoad: data => {
+            console.log(data);
+            data.html = data.data.html;
+        },
+        beforeSave: (data) => {
+            data.data = {
+                html: data.html
+            };
+
+            clearBeforeSend(data);
+        },
+    };
+
+    templateTypes.mjml = {
+        typeName: t('MJML'),
+        getForm: owner => <ACEEditor id="html" height="700px" mode="xml" label={t('Template content')}/>,
+        afterLoad: data => {
+            data.mjml = data.data.mjml;
+        },
+        beforeSave: (data) => {
+            data.data = {
+                mjml: data.mjml
+            };
+
+            clearBeforeSend(data);
+        },
+    };
+
+    return templateTypes;
+}