Added initial Offers API

refs https://github.com/TryGhost/Team/issues/1083

This is a WIP for the Offers API so that Admin development can begin to
use it.

core/server/api/canary/index.js

@@ -85,6 +85,10 @@ module.exports = {
         return shared.pipeline(require('./members'), localUtils);
     },
 
+    get offers() {
+        return shared.pipeline(require('./offers'), localUtils);
+    },
+
     get products() {
         return shared.pipeline(require('./products'), localUtils);
     },

core/server/api/canary/offers.js

@@ -0,0 +1,50 @@
+const offersService = require('../../services/offers');
+
+module.exports = {
+    docName: 'offers',
+
+    browse: {
+        permissions: true,
+        async query(frame) {
+            const offers = await offersService.api.listOffers();
+            frame.response = {
+                offers
+            };
+        }
+    },
+
+    read: {
+        data: ['id'],
+        permissions: true,
+        async query(frame) {
+            const offer = await offersService.api.getOffer(frame.data);
+            frame.response = {
+                offers: [offer]
+            };
+        }
+    },
+
+    edit: {
+        options: ['id'],
+        permissions: true,
+        async query(frame) {
+            const offer = await offersService.api.updateOffer({
+                ...frame.data.offers[0],
+                id: frame.options.id
+            });
+            frame.response = {
+                offers: [offer]
+            };
+        }
+    },
+
+    add: {
+        permissions: true,
+        async query(frame) {
+            const offer = await offersService.api.createOffer(frame.data.offers[0]);
+            frame.response = {
+                offers: [offer]
+            };
+        }
+    }
+};

core/server/web/api/canary/admin/routes.js

@@ -100,6 +100,11 @@ module.exports = function apiRoutes() {
     router.del('/members', mw.authAdminApi, http(api.members.bulkDestroy));
     router.put('/members/bulk', mw.authAdminApi, http(api.members.bulkEdit));
 
+    router.get('/offers', labs.enabledMiddleware('offers'), mw.authAdminApi, http(api.offers.browse));
+    router.post('/offers', labs.enabledMiddleware('offers'), mw.authAdminApi, http(api.offers.add));
+    router.get('/offers/:id', labs.enabledMiddleware('offers'), mw.authAdminApi, http(api.offers.read));
+    router.put('/offers/:id', labs.enabledMiddleware('offers'), mw.authAdminApi, http(api.offers.edit));
+
     router.get('/members/stats/count', mw.authAdminApi, http(api.members.memberStats));
     router.get('/members/stats/mrr', mw.authAdminApi, http(api.members.mrrStats));
     router.get('/members/stats/subscribers', mw.authAdminApi, http(api.members.subscriberStats));