From ab49d1eed6b41cf1aad1df99386c9d5589809f9b Mon Sep 17 00:00:00 2001
From: kirrg001 <katharina.irrgang@googlemail.com>
Date: Sun, 21 Apr 2019 23:55:22 +0200
Subject: [PATCH] Added comments for routing service

no issue

- jsdoc
- inline comments
---
 .../services/routing/CollectionRouter.js      | 43 +++++++++-
 core/server/services/routing/ParentRouter.js  | 81 ++++++++++++++++---
 core/server/services/routing/PreviewRouter.js | 17 ++++
 core/server/services/routing/RSSRouter.js     | 17 ++++
 .../services/routing/StaticPagesRouter.js     | 24 ++++++
 .../services/routing/StaticRoutesRouter.js    | 36 +++++++++
 .../server/services/routing/TaxonomyRouter.js | 31 +++++++
 core/server/services/routing/bootstrap.js     | 27 ++++++-
 .../services/routing/controllers/channel.js   | 16 +++-
 .../routing/controllers/collection.js         | 24 +++++-
 .../services/routing/controllers/entry.js     | 11 ++-
 .../services/routing/controllers/preview.js   | 12 ++-
 .../services/routing/controllers/rss.js       | 15 +++-
 .../services/routing/controllers/static.js    | 13 ++-
 .../services/routing/helpers/context.js       |  4 +-
 .../services/routing/helpers/entry-lookup.js  | 15 +++-
 core/server/services/routing/helpers/error.js |  7 +-
 .../services/routing/helpers/fetch-data.js    | 21 ++---
 .../routing/helpers/format-response.js        |  8 +-
 .../routing/helpers/render-entries.js         |  7 ++
 .../services/routing/helpers/render-entry.js  | 11 +--
 .../services/routing/helpers/renderer.js      | 13 ++-
 .../server/services/routing/helpers/secure.js | 15 +++-
 .../services/routing/helpers/templates.js     | 15 ++--
 .../routing/middlewares/page-param.js         |  8 ++
 core/server/services/routing/registry.js      | 41 +++++++++-
 26 files changed, 462 insertions(+), 70 deletions(-)

diff --git a/core/server/services/routing/CollectionRouter.js b/core/server/services/routing/CollectionRouter.js
index 7dfd45fb52..c679363622 100644
--- a/core/server/services/routing/CollectionRouter.js
+++ b/core/server/services/routing/CollectionRouter.js
@@ -7,6 +7,11 @@ const controllers = require('./controllers');
 const middlewares = require('./middlewares');
 const RSSRouter = require('./RSSRouter');
 
+/**
+ * @description Collection Router for post resource.
+ *
+ * Fundamental router to define where resources live and how their url structure is.
+ */
 class CollectionRouter extends ParentRouter {
     constructor(mainRoute, object, RESOURCE_CONFIG) {
         super('CollectionRouter');
@@ -15,7 +20,7 @@ class CollectionRouter extends ParentRouter {
 
         this.routerName = mainRoute === '/' ? 'index' : mainRoute.replace(/\//g, '');
 
-        // NOTE: index/parent route e.g. /, /podcast/, /magic/ ;)
+        // NOTE: this.route === index/parent route e.g. /, /podcast/, /magic/
         this.route = {
             value: mainRoute
         };
@@ -55,6 +60,10 @@ class CollectionRouter extends ParentRouter {
         this._listeners();
     }
 
+    /**
+     * @description Register all routes of this router.
+     * @private
+     */
     _registerRoutes() {
         // REGISTER: context middleware for this collection
         this.router().use(this._prepareEntriesContext.bind(this));
@@ -85,8 +94,7 @@ class CollectionRouter extends ParentRouter {
     }
 
     /**
-     * We attach context information of the router to the request.
-     * By this we can e.g. access the router options in controllers.
+     * @description Prepare index context for further middlewares/controllers.
      */
     _prepareEntriesContext(req, res, next) {
         res.routerOptions = {
@@ -108,12 +116,19 @@ class CollectionRouter extends ParentRouter {
         next();
     }
 
+    /**
+     * @description Prepare entry context for further middlewares/controllers.
+     */
     _prepareEntryContext(req, res, next) {
         res.routerOptions.context = ['post'];
         res.routerOptions.type = 'entry';
         next();
     }
 
+    /**
+     * @description This router has listeners to react on changes which happen in Ghost.
+     * @private
+     */
     _listeners() {
         /**
          * CASE: timezone changes
@@ -126,6 +141,11 @@ class CollectionRouter extends ParentRouter {
         common.events.on('settings.active_timezone.edited', this._onTimezoneEditedListener);
     }
 
+    /**
+     * @description Helper function to handle a timezone change.
+     * @param settingModel
+     * @private
+     */
     _onTimezoneEdited(settingModel) {
         const newTimezone = settingModel.attributes.value,
             previousTimezone = settingModel._previousAttributes.value;
@@ -136,20 +156,37 @@ class CollectionRouter extends ParentRouter {
 
         if (this.getPermalinks().getValue().match(/:year|:month|:day/)) {
             debug('_onTimezoneEdited: trigger regeneration');
+
+            // @NOTE: The connected url generator will listen on this event and regenerate urls.
             this.emit('updated');
         }
     }
 
+    /**
+     * @description Get resource type of this router (always "posts")
+     * @returns {string}
+     */
     getResourceType() {
+        // @TODO: resourceAlias can be removed? We removed it. Looks like a last left over. Needs double checking.
         return this.RESOURCE_CONFIG.resourceAlias || this.RESOURCE_CONFIG.resource;
     }
 
+    /**
+     * @description Get index route e.g. /, /blog/
+     * @param {Object} options
+     * @returns {String}
+     */
     getRoute(options) {
         options = options || {};
 
         return urlService.utils.createUrl(this.route.value, options.absolute, options.secure);
     }
 
+    /**
+     * @description Generate rss url.
+     * @param {Object} options
+     * @returns {String}
+     */
     getRssUrl(options) {
         if (!this.rss) {
             return null;
diff --git a/core/server/services/routing/ParentRouter.js b/core/server/services/routing/ParentRouter.js
index 19d730575a..8d330d9500 100644
--- a/core/server/services/routing/ParentRouter.js
+++ b/core/server/services/routing/ParentRouter.js
@@ -1,8 +1,9 @@
 /**
- * # Router
+ * # Parent Router
  *
- * A wrapper around express.Router
- * Intended to be extended anywhere that routes need to be registered in Ghost
+ * A wrapper around express.Router, which is controlled in Ghost.
+ *
+ * Intended to be extended anywhere that routes need to be registered in Ghost.
  * Only allows for .use and .get at the moment - we don't have clear use-cases for anything else yet.
  */
 
@@ -13,9 +14,19 @@ const debug = require('ghost-ignition').debug('services:routing:ParentRouter'),
     url = require('url'),
     security = require('../../lib/security'),
     urlService = require('../url'),
-    // This the route registry for the whole site
     registry = require('./registry');
 
+/**
+ * @description Inherited express router, which gives control to us.
+ *
+ * Purposes:
+ *   - give the router a correct name
+ *   - give the router a correct parent
+ *
+ * @param {Object} options
+ * @returns {Express-Router}
+ * @constructor
+ */
 function GhostRouter(options) {
     const router = express.Router(options);
 
@@ -34,9 +45,6 @@ function GhostRouter(options) {
     return innerRouter;
 }
 
-/**
- * We expose a very limited amount of express.Router via specialist methods
- */
 class ParentRouter extends EventEmitter {
     constructor(name) {
         super();
@@ -47,6 +55,12 @@ class ParentRouter extends EventEmitter {
         this._router = GhostRouter({mergeParams: true, parent: this});
     }
 
+    /**
+     * @description Helper function to find the site router in the express router stack.
+     * @param {Object} req
+     * @returns {Express-Router}
+     * @private
+     */
     _getSiteRouter(req) {
         let siteRouter = null;
 
@@ -62,10 +76,19 @@ class ParentRouter extends EventEmitter {
         return siteRouter;
     }
 
+    /**
+     * @description Helper function to handle redirects across routers.
+     * @param {Object} req
+     * @param {Object} res
+     * @param {Function} next
+     * @param {String} slug
+     * @private
+     */
     _respectDominantRouter(req, res, next, slug) {
         let siteRouter = this._getSiteRouter(req);
         let targetRoute = null;
 
+        // CASE: iterate over routers and check whether a router has a redirect for the target slug enabled.
         siteRouter.handle.stack.every((router) => {
             if (router.handle.parent && router.handle.parent.isRedirectEnabled && router.handle.parent.isRedirectEnabled(this.getResourceType(), slug)) {
                 targetRoute = router.handle.parent.getRoute();
@@ -93,6 +116,11 @@ class ParentRouter extends EventEmitter {
         next();
     }
 
+    /**
+     * @description Mount a router on a router (sub-routing)
+     * @param {String} path
+     * @param {Express-Router} router
+     */
     mountRouter(path, router) {
         if (arguments.length === 1) {
             router = path;
@@ -105,12 +133,24 @@ class ParentRouter extends EventEmitter {
         }
     }
 
+    /**
+     * @description Mount a route on this router.
+     * @param {String} path
+     * @param {Function} controller
+     */
     mountRoute(path, controller) {
         debug(this.name + ': mountRoute for', path, controller.name);
         registry.setRoute(this.name, path);
         this._router.get(path, controller);
     }
 
+    /**
+     * @description Unmount route.
+     *
+     * Not used at the moment, but useful to keep for e.g. deregister routes on runtime.
+     *
+     * @param {String} path
+     */
     unmountRoute(path) {
         let indexToRemove = null;
 
@@ -125,21 +165,38 @@ class ParentRouter extends EventEmitter {
         }
     }
 
+    /**
+     * @description Very important function to get the actual express router, which satisfies express.
+     * @returns {Express-Router}
+     */
     router() {
         return this._router;
     }
 
+    /**
+     * @description Get configured permalinks of this router.
+     * @returns {Object}
+     */
     getPermalinks() {
         return this.permalinks;
     }
 
+    /**
+     * @description Get configured filter of this router.
+     * @returns {String}
+     */
     getFilter() {
         return this.filter;
     }
 
     /**
-     * Will return the full route including subdirectory.
-     * Do not use this function to mount routes for now, because the subdirectory is already mounted.
+     * @description Get main route of this router.
+     *
+     * Will return the full route including subdirectory. Do not use this function to mount routes for now,
+     * because the subdirectory is already mounted as exclusive feature (independent of dynamic routing).
+     *
+     * @param {Object} options
+     * @returns {String}
      */
     getRoute(options) {
         options = options || {};
@@ -147,6 +204,12 @@ class ParentRouter extends EventEmitter {
         return urlService.utils.createUrl(this.route.value, options.absolute, options.secure);
     }
 
+    /**
+     * @description Figure out if the router has a redirect enabled.
+     * @param {String} routerType
+     * @param {String} slug
+     * @returns {boolean}
+     */
     isRedirectEnabled(routerType, slug) {
         debug('isRedirectEnabled', this.name, this.route && this.route.value, routerType, slug);
 
diff --git a/core/server/services/routing/PreviewRouter.js b/core/server/services/routing/PreviewRouter.js
index f47fbc498c..91ab22ffad 100644
--- a/core/server/services/routing/PreviewRouter.js
+++ b/core/server/services/routing/PreviewRouter.js
@@ -2,23 +2,40 @@ const ParentRouter = require('./ParentRouter');
 const urlService = require('../url');
 const controllers = require('./controllers');
 
+/**
+ * @description Preview Router.
+ */
 class PreviewRouter extends ParentRouter {
     constructor(RESOURCE_CONFIG) {
         super('PreviewRouter');
 
         this.RESOURCE_CONFIG = RESOURCE_CONFIG.QUERY.preview;
 
+        // @NOTE: hardcoded, not configureable
         this.route = {value: '/p/'};
 
         this._registerRoutes();
     }
 
+    /**
+     * @description Register all routes of this router.
+     * @private
+     */
     _registerRoutes() {
+        // REGISTER: prepare context
         this.router().use(this._prepareContext.bind(this));
 
+        // REGISTER: actual preview route
         this.mountRoute(urlService.utils.urlJoin(this.route.value, ':uuid', ':options?'), controllers.preview);
     }
 
+    /**
+     * @description Prepare context for further middlewares/controllers.
+     * @param {Object} req
+     * @param {Object} res
+     * @param {Function} next
+     * @private
+     */
     _prepareContext(req, res, next) {
         res.routerOptions = {
             type: 'entry',
diff --git a/core/server/services/routing/RSSRouter.js b/core/server/services/routing/RSSRouter.js
index 79131cae72..034d3bdf0a 100644
--- a/core/server/services/routing/RSSRouter.js
+++ b/core/server/services/routing/RSSRouter.js
@@ -4,6 +4,11 @@ const urlService = require('../url');
 const controllers = require('./controllers');
 const middlewares = require('./middlewares');
 
+/**
+ * @description RSS Router, which should be used as a sub-router in other routes.
+ *
+ * "/rss" -> RSS Router
+ */
 class RSSRouter extends ParentRouter {
     constructor() {
         super('RSSRouter');
@@ -12,17 +17,29 @@ class RSSRouter extends ParentRouter {
         this._registerRoutes();
     }
 
+    /**
+     * @description Register all routes of this router.
+     * @private
+     */
     _registerRoutes() {
         this.mountRoute(this.route.value, controllers.rss);
 
         // REGISTER: pagination
         this.router().param('page', middlewares.pageParam);
+
+        // REGISTER: actual rss route
         this.mountRoute(urlService.utils.urlJoin(this.route.value, ':page(\\d+)'), controllers.rss);
 
         // REGISTER: redirect rule
         this.mountRoute('/feed/', this._redirectFeedRequest.bind(this));
     }
 
+    /**
+     * @description Simple controller function to redirect /rss to /feed
+     * @param {Object} req
+     * @param {Object}res
+     * @private
+     */
     _redirectFeedRequest(req, res) {
         urlService
             .utils
diff --git a/core/server/services/routing/StaticPagesRouter.js b/core/server/services/routing/StaticPagesRouter.js
index 594699286c..7e8108735f 100644
--- a/core/server/services/routing/StaticPagesRouter.js
+++ b/core/server/services/routing/StaticPagesRouter.js
@@ -4,12 +4,16 @@ const ParentRouter = require('./ParentRouter');
 const controllers = require('./controllers');
 const common = require('../../lib/common');
 
+/**
+ * @description Resource: pages
+ */
 class StaticPagesRouter extends ParentRouter {
     constructor(RESOURCE_CONFIG) {
         super('StaticPagesRouter');
 
         this.RESOURCE_CONFIG = RESOURCE_CONFIG.QUERY.page;
 
+        // @NOTE: Permalink is always /:slug, not configure able
         this.permalinks = {
             value: '/:slug/'
         };
@@ -31,7 +35,12 @@ class StaticPagesRouter extends ParentRouter {
         this._registerRoutes();
     }
 
+    /**
+     * @description Register all routes of this router.
+     * @private
+     */
     _registerRoutes() {
+        // REGISTER: prepare context
         this.router().use(this._prepareContext.bind(this));
 
         this.router().param('slug', this._respectDominantRouter.bind(this));
@@ -42,6 +51,13 @@ class StaticPagesRouter extends ParentRouter {
         common.events.emit('router.created', this);
     }
 
+    /**
+     * @description Prepare context for futher middlewares/controllers.
+     * @param {Object} req
+     * @param {Object} res
+     * @param {Function} next
+     * @private
+     */
     _prepareContext(req, res, next) {
         res.routerOptions = {
             type: 'entry',
@@ -55,10 +71,18 @@ class StaticPagesRouter extends ParentRouter {
         next();
     }
 
+    /**
+     * @description Resource type.
+     * @returns {string}
+     */
     getResourceType() {
         return 'pages';
     }
 
+    /**
+     * @description This router has no index/default route. "/:slug/" is dynamic.
+     * @returns {null}
+     */
     getRoute() {
         return null;
     }
diff --git a/core/server/services/routing/StaticRoutesRouter.js b/core/server/services/routing/StaticRoutesRouter.js
index 24e452f09b..d00e56a3ca 100644
--- a/core/server/services/routing/StaticRoutesRouter.js
+++ b/core/server/services/routing/StaticRoutesRouter.js
@@ -6,6 +6,9 @@ const controllers = require('./controllers');
 const middlewares = require('./middlewares');
 const ParentRouter = require('./ParentRouter');
 
+/**
+ * @description Template routes allow you to map individual URLs to specific template files within a Ghost theme
+ */
 class StaticRoutesRouter extends ParentRouter {
     constructor(mainRoute, object) {
         super('StaticRoutesRouter');
@@ -17,6 +20,8 @@ class StaticRoutesRouter extends ParentRouter {
 
         debug(this.route.value, this.templates);
 
+        // CASE 1: Route is channel (controller: channel) -  a stream of posts
+        // CASE 2: Route is just a static page e.g. landing page
         if (this.isChannel(object)) {
             this.templates = this.templates.reverse();
             this.rss = object.rss !== false;
@@ -35,7 +40,12 @@ class StaticRoutesRouter extends ParentRouter {
         }
     }
 
+    /**
+     * @description Register all channel routes of this router (...if the router is a channel)
+     * @private
+     */
     _registerChannelRoutes() {
+        // REGISTER: prepare context object
         this.router().use(this._prepareChannelContext.bind(this));
 
         // REGISTER: is rss enabled?
@@ -54,6 +64,13 @@ class StaticRoutesRouter extends ParentRouter {
         common.events.emit('router.created', this);
     }
 
+    /**
+     * @description Prepare channel context for further middlewares/controllers.
+     * @param {Object} req
+     * @param {Object} res
+     * @param {Function} next
+     * @private
+     */
     _prepareChannelContext(req, res, next) {
         res.routerOptions = {
             type: this.controller,
@@ -69,13 +86,27 @@ class StaticRoutesRouter extends ParentRouter {
         next();
     }
 
+    /**
+     * @description Register all static routes of this router (...if the router is just a static route)
+     * @private
+     */
     _registerStaticRoute() {
+        // REGISTER: prepare context object
         this.router().use(this._prepareStaticRouteContext.bind(this));
+
+        // REGISTER: static route
         this.mountRoute(this.route.value, controllers.static);
 
         common.events.emit('router.created', this);
     }
 
+    /**
+     * @description Prepare static route context for further middlewares/controllers.
+     * @param {Object} req
+     * @param {Object} res
+     * @param {Function} next
+     * @private
+     */
     _prepareStaticRouteContext(req, res, next) {
         res.routerOptions = {
             type: 'custom',
@@ -89,6 +120,11 @@ class StaticRoutesRouter extends ParentRouter {
         next();
     }
 
+    /**
+     * @description Helper function to figure out if this router is a channel.
+     * @param {Object} object
+     * @returns {boolean}
+     */
     isChannel(object) {
         if (object && object.controller && object.controller === 'channel') {
             return true;
diff --git a/core/server/services/routing/TaxonomyRouter.js b/core/server/services/routing/TaxonomyRouter.js
index 969a19433b..5103e80de1 100644
--- a/core/server/services/routing/TaxonomyRouter.js
+++ b/core/server/services/routing/TaxonomyRouter.js
@@ -6,6 +6,10 @@ const urlService = require('../url');
 const controllers = require('./controllers');
 const middlewares = require('./middlewares');
 
+/**
+ * @description Taxonomies are groupings of posts based on a common relation.
+ * Taxonomies do not change the url of a resource.
+ */
 class TaxonomyRouter extends ParentRouter {
     constructor(key, permalinks, RESOURCE_CONFIG) {
         super('Taxonomy');
@@ -26,10 +30,15 @@ class TaxonomyRouter extends ParentRouter {
         this._registerRoutes();
     }
 
+    /**
+     * @description Register all routes of this router.
+     * @private
+     */
     _registerRoutes() {
         // REGISTER: context middleware
         this.router().use(this._prepareContext.bind(this));
 
+        // REGISTER: redirects across routers
         this.router().param('slug', this._respectDominantRouter.bind(this));
 
         // REGISTER: enable rss by default
@@ -43,11 +52,19 @@ class TaxonomyRouter extends ParentRouter {
         this.router().param('page', middlewares.pageParam);
         this.mountRoute(urlService.utils.urlJoin(this.permalinks.value, 'page', ':page(\\d+)'), controllers.channel);
 
+        // REGISTER: edit redirect to admin client e.g. /tag/:slug/edit
         this.mountRoute(urlService.utils.urlJoin(this.permalinks.value, 'edit'), this._redirectEditOption.bind(this));
 
         common.events.emit('router.created', this);
     }
 
+    /**
+     * @description Prepare context for routing middlewares/controllers.
+     * @param {Object} req
+     * @param {Object} res
+     * @param {Function} next
+     * @private
+     */
     _prepareContext(req, res, next) {
         res.routerOptions = {
             type: 'channel',
@@ -64,14 +81,28 @@ class TaxonomyRouter extends ParentRouter {
         next();
     }
 
+    /**
+     * @description Simple controller function to redirect /edit to admin client
+     * @param {Object} req
+     * @param {Object} res
+     * @private
+     */
     _redirectEditOption(req, res) {
         urlService.utils.redirectToAdmin(302, res, this.RESOURCE_CONFIG.TAXONOMIES[this.taxonomyKey].editRedirect.replace(':slug', req.params.slug));
     }
 
+    /**
+     * @description Get resource type e.g. tags or authors
+     * @returns {*}
+     */
     getResourceType() {
         return this.RESOURCE_CONFIG.TAXONOMIES[this.taxonomyKey].resource;
     }
 
+    /**
+     * @description There is no default/index route for taxonomies e.g. /tag/ does not exist, only /tag/:slug/
+     * @returns {null}
+     */
     getRoute() {
         return null;
     }
diff --git a/core/server/services/routing/bootstrap.js b/core/server/services/routing/bootstrap.js
index 89d60269f6..345e738f20 100644
--- a/core/server/services/routing/bootstrap.js
+++ b/core/server/services/routing/bootstrap.js
@@ -13,6 +13,19 @@ const ParentRouter = require('./ParentRouter');
 const registry = require('./registry');
 let siteRouter;
 
+/**
+ * @description The `init` function will return the wrapped parent express router and will start creating all
+ *              routers if you pass the option "start: true".
+ *
+ * CASES:
+ *   - if Ghost starts, it will first init the site app with the wrapper router and then call `start`
+ *     separately, because it could be that your blog goes into maintenance mode
+ *   - if you upload your routes.yaml in the admin client, we will re-initialise routing
+ *   -
+ *
+ * @param {Object} options
+ * @returns {ExpressRouter}
+ */
 module.exports.init = (options = {start: false}) => {
     debug('bootstrap');
 
@@ -32,10 +45,17 @@ module.exports.init = (options = {start: false}) => {
 };
 
 /**
- * Create a set of default and dynamic routers defined in the routing yaml.
+ * @description This function will create the routers based on the routes.yaml config.
  *
- * @TODO:
- *   - is the PreviewRouter an app?
+ * The routers are created in a specific order. This order defines who can get a resource first or
+ * who can dominant other routers.
+ *
+ * 1. Preview Router: Is the strongest and is an inbuilt feature, which you can never override.
+ * 2. Static Routes: Very strong, because you can override any urls and redirect to a static route.
+ * 3. Taxonomies: Stronger than collections, because it's an inbuilt feature.
+ * 4. Collections
+ * 5. Static Pages: Weaker than collections, because we first try to find a post slug and fallback to lookup a static page.
+ * 6. Apps: Weakest
  */
 module.exports.start = () => {
     const apiVersion = themeService.getApiVersion();
@@ -46,6 +66,7 @@ module.exports.start = () => {
     siteRouter.mountRouter(previewRouter.router());
     registry.setRouter('previewRouter', previewRouter);
 
+    // NOTE: Get the routes.yaml config
     const dynamicRoutes = settingsService.get('routes');
 
     _.each(dynamicRoutes.routes, (value, key) => {
diff --git a/core/server/services/routing/controllers/channel.js b/core/server/services/routing/controllers/channel.js
index 8b6903cb81..8008305694 100644
--- a/core/server/services/routing/controllers/channel.js
+++ b/core/server/services/routing/controllers/channel.js
@@ -5,7 +5,16 @@ const _ = require('lodash'),
     themes = require('../../themes'),
     helpers = require('../helpers');
 
-// @TODO: the collection+rss controller does almost the same
+/**
+ * @description Channel controller.
+ *
+ * @TODO: The collection+rss controller do almost the same. Merge!
+ *
+ * @param {Object} req
+ * @param {Object} res
+ * @param {Function} next
+ * @returns {Promise}
+ */
 module.exports = function channelController(req, res, next) {
     debug('channelController', req.params, res.routerOptions);
 
@@ -46,11 +55,10 @@ module.exports = function channelController(req, res, next) {
             }
 
             // Format data 1
-            // @TODO: figure out if this can be removed, it's supposed to ensure that absolutely URLs get generated
-            // correctly for the various objects, but I believe it doesn't work and a different approach is needed.
+            // @TODO: See helpers/secure for explanation.
             helpers.secure(req, result.posts);
 
-            // @TODO: get rid of this O_O
+            // @TODO: See helpers/secure for explanation.
             _.each(result.data, function (data) {
                 helpers.secure(req, data);
             });
diff --git a/core/server/services/routing/controllers/collection.js b/core/server/services/routing/controllers/collection.js
index 4d94e37a76..c2dc5da89d 100644
--- a/core/server/services/routing/controllers/collection.js
+++ b/core/server/services/routing/controllers/collection.js
@@ -6,6 +6,13 @@ const _ = require('lodash'),
     themes = require('../../themes'),
     helpers = require('../helpers');
 
+/**
+ * @description Collection controller.
+ * @param {Object} req
+ * @param {Object} res
+ * @param {Function} next
+ * @returns {Promise}
+ */
 module.exports = function collectionController(req, res, next) {
     debug('collectionController', req.params, res.routerOptions);
 
@@ -47,7 +54,17 @@ module.exports = function collectionController(req, res, next) {
 
             debug(result.posts.length);
 
-            // CASE: does this post belong to this collection?
+            /**
+             * CASE:
+             *
+             * Does this post belong to this collection?
+             * A post can only live in one collection. If you make use of multiple collections and you mis-use your routes.yaml,
+             * it can happen that your database query will load the same posts, but we cannot show a post on two
+             * different urls. This helper is only a prevention, but it's not a solution for the user, because
+             * it will break pagination (e.g. you load 10 posts from database, but you only render 9).
+             *
+             * People should always invert their filters to ensure that the database query loads unique posts per collection.
+             */
             result.posts = _.filter(result.posts, (post) => {
                 if (urlService.owns(res.routerOptions.identifier, post.id)) {
                     return post;
@@ -57,11 +74,10 @@ module.exports = function collectionController(req, res, next) {
             });
 
             // Format data 1
-            // @TODO: figure out if this can be removed, it's supposed to ensure that absolutely URLs get generated
-            // correctly for the various objects, but I believe it doesn't work and a different approach is needed.
+            // @TODO: See helpers/secure for explanation.
             helpers.secure(req, result.posts);
 
-            // @TODO: get rid of this O_O
+            // @TODO: See helpers/secure for explanation.
             _.each(result.data, function (data) {
                 helpers.secure(req, data);
             });
diff --git a/core/server/services/routing/controllers/entry.js b/core/server/services/routing/controllers/entry.js
index 79319de05a..21fb121d26 100644
--- a/core/server/services/routing/controllers/entry.js
+++ b/core/server/services/routing/controllers/entry.js
@@ -4,9 +4,11 @@ const debug = require('ghost-ignition').debug('services:routing:controllers:entr
     helpers = require('../helpers');
 
 /**
- * @TODO:
- *   - use `filter` for `findOne`?
- *   - always execute `next` until no router want's to serve and 404's
+ * @description Entry controller.
+ * @param {Object} req
+ * @param {Object} res
+ * @param {Function} next
+ * @returns {Promise}
  */
 module.exports = function entryController(req, res, next) {
     debug('entryController', res.routerOptions);
@@ -64,7 +66,8 @@ module.exports = function entryController(req, res, next) {
              * Ensure we redirect to the correct post url including subdirectory.
              *
              * @NOTE:
-             * This file is used for v0.1 and v2. v0.1 returns relative urls, v2 returns absolute urls.
+             * Keep in mind, that the logic here is used for v0.1 and v2.
+             * v0.1 returns relative urls, v2 returns absolute urls.
              *
              * @TODO:
              * Simplify if we drop v0.1.
diff --git a/core/server/services/routing/controllers/preview.js b/core/server/services/routing/controllers/preview.js
index e6d4b5c8e2..ebab3c7ac6 100644
--- a/core/server/services/routing/controllers/preview.js
+++ b/core/server/services/routing/controllers/preview.js
@@ -2,6 +2,13 @@ const debug = require('ghost-ignition').debug('services:routing:controllers:prev
     urlService = require('../../url'),
     helpers = require('../helpers');
 
+/**
+ * @description Preview Controller.
+ * @param {Object} req
+ * @param {Object} res
+ * @param {Function} next
+ * @returns {Promise}
+ */
 module.exports = function previewController(req, res, next) {
     debug('previewController');
 
@@ -10,6 +17,7 @@ module.exports = function previewController(req, res, next) {
     const params = {
         uuid: req.params.uuid,
         status: 'all',
+        // @TODO: Remove "author" if we drop v0.1
         include: 'author,authors,tags'
     };
 
@@ -23,7 +31,8 @@ module.exports = function previewController(req, res, next) {
             }
 
             if (req.params.options && req.params.options.toLowerCase() === 'edit') {
-                // @TODO: we don't know which resource type it is, because it's a generic preview handler
+                // @TODO: we don't know which resource type it is, because it's a generic preview handler and the
+                //        preview API returns {previews: []}
                 // @TODO: figure out how to solve better
                 const resourceType = post.page ? 'page' : 'post';
 
@@ -38,6 +47,7 @@ module.exports = function previewController(req, res, next) {
                 return urlService.utils.redirect301(res, urlService.getUrlByResourceId(post.id, {withSubdirectory: true}));
             }
 
+            // @TODO: See helpers/secure
             helpers.secure(req, post);
 
             const renderer = helpers.renderEntry(req, res);
diff --git a/core/server/services/routing/controllers/rss.js b/core/server/services/routing/controllers/rss.js
index dbdd5590fa..55e7a97b21 100644
--- a/core/server/services/routing/controllers/rss.js
+++ b/core/server/services/routing/controllers/rss.js
@@ -7,7 +7,7 @@ const _ = require('lodash'),
     rssService = require('../../rss'),
     helpers = require('../helpers');
 
-// @TODO: is this the right logic? move to UrlService utils
+// @TODO: move to services/url/utils
 function getBaseUrlForRSSReq(originalUrl, pageParam) {
     return url.parse(originalUrl).pathname.replace(new RegExp('/' + pageParam + '/$'), '/');
 }
@@ -21,7 +21,14 @@ function getTitle(relatedData) {
     return titleStart + settingsCache.get('title');
 }
 
-// @TODO: the collection controller does almost the same
+/**
+ * @description RSS controller.
+ *
+ * @TODO: The collection controller does almost the same. Merge!
+ * @param {Object} req
+ * @param {Object} res
+ * @param {Function} next
+ */
 module.exports = function rssController(req, res, next) {
     debug('rssController');
 
@@ -30,8 +37,8 @@ module.exports = function rssController(req, res, next) {
         slug: req.params.slug ? security.string.safe(req.params.slug) : undefined
     };
 
-    // CASE: we are using an rss cache - url must be normalised (without pagination)
-    // @TODO: this belongs to the rss service
+    // CASE: Ghost is using an rss cache - we have to normalise the (without pagination)
+    // @TODO: This belongs to the rss service O_o
     const baseUrl = getBaseUrlForRSSReq(req.originalUrl, pathOptions.page);
 
     helpers.fetchData(pathOptions, res.routerOptions, res.locals)
diff --git a/core/server/services/routing/controllers/static.js b/core/server/services/routing/controllers/static.js
index 2d9f3c094d..218a73454a 100644
--- a/core/server/services/routing/controllers/static.js
+++ b/core/server/services/routing/controllers/static.js
@@ -14,6 +14,7 @@ function processQuery(query, locals) {
     //       We override the `include` property for now, because the full data set is required anyway.
     if (_.get(query, 'resource') === 'posts') {
         _.extend(query.options, {
+            // @TODO: Remove "author" when we drop v0.1
             include: 'author,authors,tags'
         });
     }
@@ -26,10 +27,16 @@ function processQuery(query, locals) {
         });
     }
 
-    // Return a promise for the api query
     return api[query.controller][query.type](query.options);
 }
 
+/**
+ * @description Static route controller.
+ * @param {Object} req
+ * @param {Object} res
+ * @param {Function} next
+ * @returns {Promise}
+ */
 module.exports = function staticController(req, res, next) {
     debug('staticController', res.routerOptions);
 
@@ -51,13 +58,13 @@ module.exports = function staticController(req, res, next) {
 
                     if (config.type === 'browse') {
                         response.data[name].meta = result[name].meta;
-                        // @TODO: remove in v3
+                        // @TODO: remove in Ghost 3.0 (see https://github.com/TryGhost/Ghost/issues/10434)
                         response.data[name][config.resource] = result[name][config.resource];
                     }
                 });
             }
 
-            // @TODO: get rid of this O_O
+            // @TODO: See helpers/secure for more context.
             _.each(response.data, function (data) {
                 helpers.secure(req, data);
             });
diff --git a/core/server/services/routing/helpers/context.js b/core/server/services/routing/helpers/context.js
index 816605c233..897b84fc6c 100644
--- a/core/server/services/routing/helpers/context.js
+++ b/core/server/services/routing/helpers/context.js
@@ -11,7 +11,7 @@
  * 3. data - used for telling the difference between posts and pages
  */
 const labs = require('../../labs'),
-    // @TODO: fix this, this is app specific and should be dynamic
+    // @TODO: fix this!! These regexes are app specific and should be dynamic. They should not belong here....
     // routeKeywords.private: 'private'
     privatePattern = new RegExp('^\\/private\\/'),
     // routeKeywords.subscribe: 'subscribe'
@@ -27,6 +27,7 @@ function setResponseContext(req, res, data) {
     res.locals.context = [];
 
     // If we don't have a relativeUrl, we can't detect the context, so return
+    // See shared/middlewares/ghost-locals
     if (!res.locals.relativeUrl) {
         return;
     }
@@ -63,6 +64,7 @@ function setResponseContext(req, res, data) {
         }
     }
 
+    // @TODO: remove first if condition when we drop v0.1
     if (data && data.post && data.post.page) {
         if (!res.locals.context.includes('page')) {
             res.locals.context.push('page');
diff --git a/core/server/services/routing/helpers/entry-lookup.js b/core/server/services/routing/helpers/entry-lookup.js
index 4ccd98adf7..0138f6e29d 100644
--- a/core/server/services/routing/helpers/entry-lookup.js
+++ b/core/server/services/routing/helpers/entry-lookup.js
@@ -5,6 +5,13 @@ const debug = require('ghost-ignition').debug('services:routing:helpers:entry-lo
 const routeMatch = require('path-match')();
 const config = require('../../../config');
 
+/**
+ * @description Query API for a single entry/resource.
+ * @param {String} postUrl
+ * @param {Object} routerOptions
+ * @param {Objec†} locals
+ * @returns {*}
+ */
 function entryLookup(postUrl, routerOptions, locals) {
     debug(postUrl);
 
@@ -32,11 +39,11 @@ function entryLookup(postUrl, routerOptions, locals) {
         isEditURL = true;
     }
 
-    /**
-     * Query database to find entry.
-     * @deprecated: `author`, will be removed in Ghost 3.0
-     */
     let options = {
+        /**
+         * @deprecated: `author`, will be removed in Ghost 3.0
+         * @TODO: Remove "author" when we drop v0.1
+         */
         include: 'author,authors,tags'
     };
 
diff --git a/core/server/services/routing/helpers/error.js b/core/server/services/routing/helpers/error.js
index 62cca657b4..ce658479fd 100644
--- a/core/server/services/routing/helpers/error.js
+++ b/core/server/services/routing/helpers/error.js
@@ -1,8 +1,13 @@
 const common = require('../../../lib/common');
 
+/**
+ * @description Centralised error handling for API requests.
+ * @param {Function} next
+ * @returns {Closure} handleError
+ */
 function handleError(next) {
     return function handleError(err) {
-        // If we've thrown an error message of type: 'NotFound' then we found no path match.
+        // CASE: if we've thrown an error message of type: 'NotFound' then we found no path match, try next router!
         if (err.errorType === 'NotFoundError') {
             return next();
         }
diff --git a/core/server/services/routing/helpers/fetch-data.js b/core/server/services/routing/helpers/fetch-data.js
index 9a3ab46775..ff824278dd 100644
--- a/core/server/services/routing/helpers/fetch-data.js
+++ b/core/server/services/routing/helpers/fetch-data.js
@@ -16,29 +16,31 @@ const queryDefaults = {
 };
 
 /**
- * @deprecated: `author`, will be removed in Ghost 3.0
+ * The theme expects to have access to the relations by default e.g. {{post.authors}}
  */
 const defaultQueryOptions = {
     options: {
+        /**
+         * @deprecated: `author`, will be removed in Ghost 3.0
+         * @TODO: Remove "author" when we drop v0.1
+         */
         include: 'author,authors,tags'
     }
 };
 
-/**
- * Default post query needs to always include author, authors & tags
- */
 const defaultPostQuery = _.cloneDeep(queryDefaults);
 defaultPostQuery.options = defaultQueryOptions.options;
 
 /**
- * ## Process Query
+ * @description Process query request.
+ *
  * Takes a 'query' object, ensures that type, resource and options are set
  * Replaces occurrences of `%s` in options with slugParam
  * Converts the query config to a promise for the result
  *
- * @param {{type: String, resource: String, options: Object}} query
+ * @param {Object} query
  * @param {String} slugParam
- * @returns {Promise} promise for an API call
+ * @returns {Promise}
  */
 function processQuery(query, slugParam, locals) {
     const api = require('../../../api')[locals.apiVersion];
@@ -55,12 +57,13 @@ function processQuery(query, slugParam, locals) {
     if (config.get('enableDeveloperExperiments')) {
         query.options.context = {member: locals.member};
     }
-    // Return a promise for the api query
+
     return (api[query.controller] || api[query.resource])[query.type](query.options);
 }
 
 /**
- * ## Fetch Data
+ * @description Fetch data from API helper for controllers.
+ *
  * Calls out to get posts per page, builds the final posts query & builds any additional queries
  * Wraps the queries using Promise.props to ensure it gets named responses
  * Does a first round of formatting on the response, and returns
diff --git a/core/server/services/routing/helpers/format-response.js b/core/server/services/routing/helpers/format-response.js
index f0b0c5c979..77fbf5e1b9 100644
--- a/core/server/services/routing/helpers/format-response.js
+++ b/core/server/services/routing/helpers/format-response.js
@@ -1,8 +1,8 @@
 const _ = require('lodash');
 
 /**
- * formats variables for handlebars in multi-post contexts.
- * If extraValues are available, they are merged in the final value
+ * @description Formats API response into handlebars/theme format.
+ *
  * @return {Object} containing page variables
  */
 function formatPageResponse(result) {
@@ -32,12 +32,14 @@ function formatPageResponse(result) {
 }
 
 /**
- * similar to formatPageResponse, but for entries (post or page)
+ * @description Format a single resource for handlebars.
  *
  * @TODO
  * In the future, we should return {page: entry} or {post:entry).
  * But for now, we would break the themes if we just change it.
  *
+ * @see https://github.com/TryGhost/Ghost/issues/10042.
+ *
  * @return {Object} containing page variables
  */
 function formatResponse(post) {
diff --git a/core/server/services/routing/helpers/render-entries.js b/core/server/services/routing/helpers/render-entries.js
index 6ef58c2765..bd3d1e4750 100644
--- a/core/server/services/routing/helpers/render-entries.js
+++ b/core/server/services/routing/helpers/render-entries.js
@@ -2,6 +2,13 @@ const debug = require('ghost-ignition').debug('services:routing:helpers:render-e
     formatResponse = require('./format-response'),
     renderer = require('./renderer');
 
+/**
+ * @description Helper to handle rendering multiple resources.
+ *
+ * @param {Object} req
+ * @param {Object} res
+ * @returns {Closure)
+ */
 module.exports = function renderEntries(req, res) {
     debug('renderEntries called');
     return function renderEntries(result) {
diff --git a/core/server/services/routing/helpers/render-entry.js b/core/server/services/routing/helpers/render-entry.js
index 8b1f4b22d5..2c684bdd38 100644
--- a/core/server/services/routing/helpers/render-entry.js
+++ b/core/server/services/routing/helpers/render-entry.js
@@ -1,11 +1,12 @@
 const debug = require('ghost-ignition').debug('services:routing:helpers:render-post'),
     formatResponse = require('./format-response'),
     renderer = require('./renderer');
-/*
- * Sets the response context around an entry (post or page)
- * and renders it with the correct template.
- * Used by post preview and entry methods.
- * Returns a function that takes the entry to be rendered.
+/**
+ * @description Helper to handle rendering multiple resources.
+ *
+ * @param {Object} req
+ * @param {Object} res
+ * @returns {Closure)
  */
 module.exports = function renderEntry(req, res) {
     debug('renderEntry called');
diff --git a/core/server/services/routing/helpers/renderer.js b/core/server/services/routing/helpers/renderer.js
index 1b14ce8275..2515638c0d 100644
--- a/core/server/services/routing/helpers/renderer.js
+++ b/core/server/services/routing/helpers/renderer.js
@@ -2,22 +2,29 @@ const debug = require('ghost-ignition').debug('services:routing:helpers:renderer
     setContext = require('./context'),
     templates = require('./templates');
 
+/**
+ * @description Helper function to finally render the data.
+ * @param {Object} req
+ * @param {Object} res
+ * @param {Object} data
+ */
 module.exports = function renderer(req, res, data) {
-    // Context
+    // Set response context
     setContext(req, res, data);
 
-    // Template
+    // Set template
     templates.setTemplate(req, res, data);
 
-    // Render Call
     debug('Rendering template: ' + res._template + ' for: ' + req.originalUrl);
     debug('res.locals', res.locals);
 
+    // CASE: You can set the content type of the page in your routes.yaml file
     if (res.routerOptions && res.routerOptions.contentType) {
         if (res.routerOptions.templates.indexOf(res._template) !== -1) {
             res.type(res.routerOptions.contentType);
         }
     }
 
+    // Render Call
     res.render(res._template, data);
 };
diff --git a/core/server/services/routing/helpers/secure.js b/core/server/services/routing/helpers/secure.js
index c91e4b2e3d..4c96054071 100644
--- a/core/server/services/routing/helpers/secure.js
+++ b/core/server/services/routing/helpers/secure.js
@@ -1,6 +1,15 @@
-// TODO: figure out how to remove the need for this
-// Add Request context parameter to the data object
-// to be passed down to the templates
+/**
+ * @description Tiny/Weird helper to attach the information if the request is HTTPS or HTTP.
+ *
+ * It's used in services/url/utils (search for ".secure").
+ *
+ * We forward the resource into handlebars and if you use the URL helper, we want to know if the original request
+ * was https or not to generate the correct URL...but that is only true, if your blog url is set to HTTP, but NGINX supports HTTPS.
+ *
+ * @TODO: Drop in Ghost 3.0, because we will only support https.
+ * @param {Object} req
+ * @param {Object} data
+ */
 function setRequestIsSecure(req, data) {
     (Array.isArray(data) ? data : [data]).forEach(function forEach(d) {
         d.secure = req.secure;
diff --git a/core/server/services/routing/helpers/templates.js b/core/server/services/routing/helpers/templates.js
index 654622134f..0ad42f84ae 100644
--- a/core/server/services/routing/helpers/templates.js
+++ b/core/server/services/routing/helpers/templates.js
@@ -2,7 +2,6 @@
 //
 // Figure out which template should be used to render a request
 // based on the templates which are allowed, and what is available in the theme
-// TODO: consider where this should live as it deals with collections, entries, and errors
 const _ = require('lodash'),
     path = require('path'),
     url = require('url'),
@@ -11,7 +10,7 @@ const _ = require('lodash'),
     _private = {};
 
 /**
- * ## Get Error Template Hierarchy
+ * @description Get Error Template Hierarchy
  *
  * Fetch the ordered list of templates that can be used to render this error statusCode.
  *
@@ -34,7 +33,7 @@ _private.getErrorTemplateHierarchy = function getErrorTemplateHierarchy(statusCo
 };
 
 /**
- * ## Get Template Hierarchy
+ * @description Get Template Hierarchy
  *
  * Fetch the ordered list of templates that can be used to render this request.
  * 'index' is the default / fallback
@@ -72,7 +71,7 @@ _private.getEntriesTemplateHierarchy = function getEntriesTemplateHierarchy(rout
 };
 
 /**
- * ## Get Entry Template Hierarchy
+ * @description Get Entry Template Hierarchy
  *
  * Fetch the ordered list of templates that can be used to render this request.
  * 'post' is the default / fallback
@@ -101,7 +100,7 @@ _private.getEntryTemplateHierarchy = function getEntryTemplateHierarchy(postObje
 };
 
 /**
- * ## Pick Template
+ * @description Pick Template
  *
  * Taking the ordered list of allowed templates for this request
  * Cycle through and find the first one which has a match in the theme
@@ -157,6 +156,12 @@ _private.getTemplateForError = function getTemplateForError(statusCode) {
     return _private.pickTemplate(templateList, fallback);
 };
 
+/**
+ * @description Set template for express. Express will render the template you set here.
+ * @param {Object} req
+ * @param {Object} res
+ * @param {Object} data
+ */
 module.exports.setTemplate = function setTemplate(req, res, data) {
     if (res._template && !req.err) {
         return;
diff --git a/core/server/services/routing/middlewares/page-param.js b/core/server/services/routing/middlewares/page-param.js
index 4ed75640c1..38e2ad03c1 100644
--- a/core/server/services/routing/middlewares/page-param.js
+++ b/core/server/services/routing/middlewares/page-param.js
@@ -1,6 +1,14 @@
 const common = require('../../../lib/common'),
     urlService = require('../../url');
 
+/**
+ * @description Middleware, which validates and interprets the page param e.g. /page/1
+ * @param {Object} req
+ * @param {Object} res
+ * @param {Function} next
+ * @param {Number} page
+ * @returns {*}
+ */
 module.exports = function handlePageParam(req, res, next, page) {
     // routeKeywords.page: 'page'
     const pageRegex = new RegExp('/page/(.*)?/'),
diff --git a/core/server/services/routing/registry.js b/core/server/services/routing/registry.js
index 88538d1033..abda8ee16f 100644
--- a/core/server/services/routing/registry.js
+++ b/core/server/services/routing/registry.js
@@ -2,31 +2,64 @@ const _ = require('lodash');
 let routes = [];
 let routers = {};
 
+/**
+ * @description The router registry is helpful for debugging purposes and let's you search existing routes and routers.
+ */
 module.exports = {
+    /**
+     * @description Get's called if you register a url pattern in express.
+     * @param {String} routerName
+     * @param {String} route
+     */
     setRoute(routerName, route) {
         routes.push({route: route, from: routerName});
     },
 
+    /**
+     * @description Get's called if you register a router in express.
+     * @param {String} name
+     * @param {Express-Router} router
+     */
     setRouter(name, router) {
         routers[name] = router;
     },
 
+    /**
+     * @description Get all registered routes.
+     * @returns {Array}
+     */
     getAllRoutes() {
         return _.cloneDeep(routes);
     },
 
+    /**
+     * @description Get router by name.
+     * @param {String} name
+     * @returns {Express-Router}
+     */
     getRouter(name) {
         return routers[name];
     },
 
     /**
-     * https://github.com/TryGhost/Team/issues/65#issuecomment-393622816
+     *
      *
      * Hierarchy for primary rss url:
      *
      * - index collection (/)
      * - if you only have one collection, we take this rss url
      */
+    /**
+     * @description Helper to figure out the primary rss url.
+     *
+     * If you either configure multiple collections or your collection does not live on "/", we need to know
+     * what your primary rss url is, otherwise /rss could be 404.
+     *
+     * More context: https://github.com/TryGhost/Team/issues/65#issuecomment-393622816
+     *
+     * @param {Object} options
+     * @returns {String}
+     */
     getRssUrl(options) {
         let rssUrl = null;
 
@@ -55,10 +88,16 @@ module.exports = {
         return rssUrl;
     },
 
+    /**
+     * @description Reset all routes.
+     */
     resetAllRoutes() {
         routes = [];
     },
 
+    /**
+     * @description Reset all routers.
+     */
     resetAllRouters() {
         _.each(routers, (value) => {
             value.reset();