Switched post routing to uuid instead of slug

refs https://github.com/TryGhost/Team/issues/990

- Relying on uuid instead of slug makes the posts less discoverable and partially soves discoverability through overriden robots.txt files

core/frontend/services/routing/EmailRouter.js

@@ -26,7 +26,7 @@ class EmailRouter extends ParentRouter {
         this.router().use(this._prepareContext.bind(this));
 
         // REGISTER: actual email route
-        this.mountRoute(urlUtils.urlJoin(this.route.value, ':slug', ':options?'), controllers.email);
+        this.mountRoute(urlUtils.urlJoin(this.route.value, ':uuid', ':options?'), controllers.email);
     }
 
     /**

core/frontend/services/routing/controllers/email-post.js

@@ -17,7 +17,7 @@ module.exports = function emailPostController(req, res, next) {
     const api = require('../../proxy').api[res.locals.apiVersion];
 
     const params = {
-        slug: req.params.slug,
+        uuid: req.params.uuid,
         include: 'authors,tags',
         context: {
             member: res.locals.member

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

@@ -12,7 +12,7 @@ module.exports = {
             'include'
         ],
         data: [
-            'slug'
+            'uuid'
         ],
         validation: {
             options: {
@@ -21,7 +21,7 @@ module.exports = {
                 }
             },
             data: {
-                slug: {
+                uuid: {
                     required: true
                 }
             }

test/regression/site/email_routes.test.js

@@ -56,7 +56,7 @@ describe('Frontend Routing: Email Routes', function () {
     });
 
     it('should display email_only post', async function () {
-        const res = await request.get(`/email/${emailPosts[0].get('slug')}/`)
+        const res = await request.get(`/email/${emailPosts[0].get('uuid')}/`)
             .expect('Content-Type', /html/)
             .expect(200);
 
@@ -71,7 +71,12 @@ describe('Frontend Routing: Email Routes', function () {
     });
 
     it('404s for draft email only post', function () {
-        return request.get(`/email/${emailPosts[1].get('slug')}/`)
+        return request.get(`/email/${emailPosts[1].get('uuid')}/`)
+            .expect(404);
+    });
+
+    it('404s known slug', function () {
+        return request.get(`/email/${emailPosts[0].get('slug')}/`)
             .expect(404);
     });