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ghost/core/server/apps/amp/lib/router.js
Katharina Irrgang b392d1925a
Dynamic Routing Beta (#9596)
refs #9601

### Dynamic Routing

This is the beta version of dynamic routing. 

- we had a initial implementation of "channels" available in the codebase
- we have removed and moved this implementation 
- there is now a centralised place for dynamic routing - server/services/routing
- each routing component is represented by a router type e.g. collections, routes, static pages, taxonomies, rss, preview of posts
- keep as much as possible logic of routing helpers, middlewares and controllers
- ensure test coverage
- connect all the things together
  - yaml file + validation
  - routing + routers
  - url service
  - sitemaps
  - url access
- deeper implementation of yaml validations
  - e.g. hard require slashes
- ensure routing hierarchy/order
  - e.g. you enable the subscriber app
  - you have a custom static page, which lives under the same slug /subscribe
  - static pages are stronger than apps
  - e.g. the first collection owns the post it has filtered
  - a post cannot live in two collections
- ensure apps are still working and hook into the routers layer (or better said: and register in the routing service)
- put as much as possible comments to the code base for better understanding
- ensure a clean debug log
- ensure we can unmount routes
  - e.g. you have a collection permalink of /:slug/ represented by {globals.permalink}
  - and you change the permalink in the admin to dated permalink
  - the express route get's refreshed from /:slug/ to /:year/:month/:day/:slug/
  - unmount without server restart, yey
- ensure we are backwards compatible
  - e.g. render home.hbs for collection index if collection route is /
  - ensure you can access your configured permalink from the settings table with {globals.permalink}

### Render 503 if url service did not finish

- return 503 if the url service has not finished generating the resource urls

### Rewrite sitemaps

- we have rewritten the sitemaps "service", because the url generator does no longer happen on runtime
- we generate all urls on bootstrap
- the sitemaps service will consume created resource and router urls
- these urls will be shown on the xml pages
- we listen on url events
- we listen on router events
- we no longer have to fetch the resources, which is nice
  - the urlservice pre-fetches resources and emits their urls
- the urlservice is the only component who knows which urls are valid
- i made some ES6 adaptions
- we keep the caching logic -> only regenerate xml if there is a change
- updated tests
- checked test coverage (100%)

### Re-work usage of Url utility

- replace all usages of `urlService.utils.urlFor` by `urlService.getByResourceId`
  - only for resources e.g. post, author, tag
- this is important, because with dynamic routing we no longer create static urls based on the settings permalink on runtime
- adapt url utility
- adapt tests
2018-06-05 19:02:20 +02:00

90 lines
2.9 KiB
JavaScript

var path = require('path'),
express = require('express'),
ampRouter = express.Router(),
// Dirty requires
common = require('../../../lib/common'),
urlService = require('../../../services/url'),
helpers = require('../../../services/routing/helpers'),
templateName = 'amp';
function _renderer(req, res, next) {
// Note: this is super similar to the config middleware used in channels
// @TODO refactor into to something explicit & DRY this up
res._route = {
type: 'custom',
templateName: templateName,
defaultTemplate: path.resolve(__dirname, 'views', templateName + '.hbs')
};
// Renderer begin
// Format data
var data = req.body || {};
// CASE: we only support amp pages for posts that are not static pages
if (!data.post || data.post.page) {
return next(new common.errors.NotFoundError({message: common.i18n.t('errors.errors.pageNotFound')}));
}
// Render Call
return helpers.renderer(req, res, data);
}
// This here is a controller.
// In fact, this whole file is nothing more than a controller + renderer & doesn't need to be a router
function getPostData(req, res, next) {
req.body = req.body || {};
const urlWithSubdirectoryWithoutAmp = req.originalUrl.match(/(.*?\/)amp/)[1];
const urlWithoutSubdirectoryWithoutAmp = res.locals.relativeUrl.match(/(.*?\/)amp/)[1];
/**
* @NOTE
*
* We have to figure out the target permalink, otherwise it would be possible to serve a post
* which lives in two collections.
*
* @TODO:
*
* This is not optimal and caused by the fact how apps currently work. But apps weren't designed
* for dynamic routing.
*
* I think if the responsible, target router would first take care fetching/determining the post, the
* request could then be forwarded to this app. Then we don't have to:
*
* 1. care about fetching the post
* 2. care about if the post can be served
* 3. then this app would act like an extension
*
* The challenge is to design different types of apps e.g. extensions of routers, standalone pages etc.
*/
const permalinks = urlService.getPermalinkByUrl(urlWithSubdirectoryWithoutAmp, {withUrlOptions: true});
if (!permalinks) {
return next(new common.errors.NotFoundError({
message: common.i18n.t('errors.errors.pageNotFound')
}));
}
helpers.postLookup(urlWithoutSubdirectoryWithoutAmp, {permalinks: permalinks})
.then(function handleResult(result) {
if (result && result.post) {
req.body.post = result.post;
}
next();
})
.catch(next);
}
// AMP frontend route
ampRouter
.route('/')
.get(
getPostData,
_renderer
);
module.exports = ampRouter;
module.exports.renderer = _renderer;
module.exports.getPostData = getPostData;