Support incrementing push badge value by more than 1 (parse-community#4889)

* Support 'IncrementByN' badge value for higher push badge increments

* Fix test

* Rely on object for badge incrementation (i.e. {increment: 3}) rather than string (IncrementBy3)

* For badge incrementation, utilize format similar to other operation notation

Author: Ross Bayer

spec/PushController.spec.js

@@ -245,6 +245,84 @@ describe('PushController', () => {
     });
   });
 
+  it('properly increment badges by more than 1', (done) => {
+    const pushAdapter = {
+      send: function(body, installations) {
+        const badge = body.data.badge;
+        installations.forEach((installation) => {
+          expect(installation.badge).toEqual(badge);
+          expect(installation.originalBadge + 3).toEqual(installation.badge);
+        })
+        return successfulTransmissions(body, installations);
+      },
+      getValidPushTypes: function() {
+        return ["ios", "android"];
+      }
+    }
+    const payload = {data:{
+      alert: "Hello World!",
+      badge: { __op: 'Increment', amount: 3 },
+    }}
+    const installations = [];
+    while(installations.length != 10) {
+      const installation = new Parse.Object("_Installation");
+      installation.set("installationId", "installation_" + installations.length);
+      installation.set("deviceToken","device_token_" + installations.length)
+      installation.set("badge", installations.length);
+      installation.set("originalBadge", installations.length);
+      installation.set("deviceType", "ios");
+      installations.push(installation);
+    }
+
+    while(installations.length != 15) {
+      const installation = new Parse.Object("_Installation");
+      installation.set("installationId", "installation_" + installations.length);
+      installation.set("deviceToken","device_token_" + installations.length);
+      installation.set("badge", installations.length);
+      installation.set("originalBadge", installations.length);
+      installation.set("deviceType", "android");
+      installations.push(installation);
+    }
+    const config = Config.get(Parse.applicationId);
+    const auth = {
+      isMaster: true
+    }
+
+    const pushController = new PushController();
+    reconfigureServer({
+      push: { adapter: pushAdapter }
+    }).then(() => {
+      return Parse.Object.saveAll(installations)
+    }).then(() => {
+      return pushController.sendPush(payload, {}, config, auth);
+    }).then(() => {
+      // Wait so the push is completed.
+      return new Promise((resolve) => { setTimeout(() => { resolve(); }, 1000); });
+    }).then(() => {
+      // Check we actually sent 15 pushes.
+      const query = new Parse.Query('_PushStatus');
+      return query.find({ useMasterKey: true })
+    }).then((results) => {
+      expect(results.length).toBe(1);
+      const pushStatus = results[0];
+      expect(pushStatus.get('numSent')).toBe(15);
+    }).then(() => {
+      // Check that the installations were actually updated.
+      const query = new Parse.Query('_Installation');
+      return query.find({ useMasterKey: true })
+    }).then((results) => {
+      expect(results.length).toBe(15);
+      for (let i = 0; i < 15; i++) {
+        const installation = results[i];
+        expect(installation.get('badge')).toBe(parseInt(installation.get('originalBadge')) + 3);
+      }
+      done()
+    }).catch((err) => {
+      jfail(err);
+      done();
+    });
+  });
+
   it('properly set badges to 1', (done) => {
 
     const pushAdapter = {

src/Controllers/PushController.js

@@ -44,10 +44,13 @@ export class PushController {
       let restUpdate = {};
       if (typeof badge == 'string' && badge.toLowerCase() === 'increment') {
         restUpdate = { badge: { __op: 'Increment', amount: 1 } }
+      } else if (typeof badge == 'object' && typeof badge.__op == 'string' &&
+                 badge.__op.toLowerCase() == 'increment' && Number(badge.amount)) {
+        restUpdate = { badge: { __op: 'Increment', amount: badge.amount } }
       } else if (Number(badge)) {
         restUpdate = { badge: badge }
       } else {
-        throw "Invalid value for badge, expected number or 'Increment'";
+        throw "Invalid value for badge, expected number or 'Increment' or {increment: number}";
       }
 
       // Force filtering on only valid device tokens

src/Push/utils.js

@@ -2,10 +2,17 @@ import Parse    from 'parse/node';
 import deepcopy from 'deepcopy';
 
 export function isPushIncrementing(body) {
-  return body.data &&
-         body.data.badge &&
-         typeof body.data.badge == 'string' &&
-         body.data.badge.toLowerCase() == "increment"
+  if (!body.data || !body.data.badge) {
+    return false;
+  }
+
+  const badge = body.data.badge;
+  if (typeof badge == 'string' && badge.toLowerCase() == "increment") {
+    return true;
+  }
+
+  return typeof badge == 'object' && typeof badge.__op == 'string' &&
+         badge.__op.toLowerCase() == "increment" && Number(badge.amount);
 }
 
 const localizableKeys = ['alert', 'title'];