Add login to bookshop Vue.js app (#358)

bookshop/srv/cat-service.js

@@ -2,7 +2,7 @@ const cds = require('@sap/cds')
 
 class CatalogService extends cds.ApplicationService { init(){
 
-  const { Books } = cds.entities ('sap.capire.bookshop')
+  const { Books } = this.entities ('sap.capire.bookshop')
 
   // Reduce stock of ordered books if available stock suffices
   this.on ('submitOrder', async req => {

bookshop/srv/user-service.cds

@@ -1,9 +1,7 @@
 /**
  * Exposes user information
  */
-@requires: 'authenticated-user'
 service UserService {
-
   /**
    * The current user
    */
@@ -13,4 +11,5 @@ service UserService {
     tenant : String;
   }
 
+  action login() returns me;
 }

bookshop/srv/user-service.js

@@ -1,4 +1,9 @@
 const cds = require('@sap/cds')
-module.exports = cds.service.impl((srv) => {
-  srv.on('READ', 'me', ({ tenant, user, locale }) => ({ id: user.id, locale, tenant }))
-})
+module.exports = class UserService extends cds.Service { init(){
+  this.on('READ', 'me', ({ tenant, user, locale }) => ({ id: user.id, locale, tenant }))
+  this.on('login', (req) => {
+    if (req.user._is_anonymous)
+      req._.res.set('WWW-Authenticate','Basic realm="Users"').sendStatus(401)
+    else return this.read('me')
+  })
+}}