Added email preview controller

core/server/api/canary/email-preview.js

@@ -0,0 +1,36 @@
+const models = require('../../models');
+const common = require('../../lib/common');
+const mega = require('../../services/mega');
+
+module.exports = {
+    docName: 'email_preview',
+
+    read: {
+        options: [
+            'fields'
+        ],
+        validation: {
+            options: {
+                fields: ['html', 'plaintext', 'subject']
+            }
+        },
+        data: [
+            'id'
+        ],
+        permissions: true,
+        query(frame) {
+            return models.Post.findOne(frame.data, frame.options)
+                .then((model) => {
+                    if (!model) {
+                        throw new common.errors.NotFoundError({
+                            message: common.i18n.t('errors.api.posts.postNotFound')
+                        });
+                    }
+
+                    const post = model.toJSON();
+
+                    return mega.postEmailSerializer.serialize(post);
+                });
+        }
+    }
+};