Fix for #660

Campaign preview and campaign test send pulls the first entry in the RSS feed and substitutes its data in `[RSS_ENTRY_*]`

server/routes/campaigns.js

@@ -0,0 +1,69 @@
+'use strict';
+
+const passport = require('../lib/passport');
+const routerFactory = require('../lib/router-async');
+const campaigns = require('../models/campaigns');
+const lists = require('../models/lists');
+const users = require('../models/users');
+const contextHelpers = require('../lib/context-helpers');
+const { AppType } = require('../../shared/app');
+
+
+users.registerRestrictedAccessTokenMethod('rssPreview', async ({campaignCid, listCid}) => {
+
+    const campaign = await campaigns.getByCid(contextHelpers.getAdminContext(), campaignCid);
+    const list = await lists.getByCid(contextHelpers.getAdminContext(), listCid);
+
+    return {
+        permissions: {
+            'campaign': {
+                [campaign.id]: new Set(['view'])
+            },
+            'list': {
+                [list.id]: new Set(['view', 'viewTestSubscriptions'])
+            }
+        }
+    };
+});
+
+async function getRouter(appType) {
+    const router = routerFactory.create();
+
+    if (appType === AppType.SANDBOXED) {
+
+        router.get('/rss-preview/:campaign/:list/:subscription', passport.loggedIn, (req, res, next) => {
+            campaigns.getRssPreview(req.context, req.params.campaign, req.params.list, req.params.subscription)
+                .then(result => {
+                    const {html} = result;
+
+                    if (html.match(/<\/body\b/i)) {
+                        res.render('partials/tracking-scripts', {
+                            layout: 'archive/layout-raw'
+                        }, (err, scripts) => {
+                            if (err) {
+                                return next(err);
+                            }
+                            const htmlWithScripts = scripts ? html.replace(/<\/body\b/i, match => scripts + match) : html;
+
+                            res.render('archive/view', {
+                                layout: 'archive/layout-raw',
+                                message: htmlWithScripts
+                            });
+                        });
+
+                    } else {
+                        res.render('archive/view', {
+                            layout: 'archive/layout-wrapped',
+                            message: html
+                        });
+                    }
+
+                })
+                .catch(err => next(err));
+        });
+    }
+
+    return router;
+}
+
+module.exports.getRouter = getRouter;