Adding OneSignal Push Adapter

[gdeglin]

This OneSignalPushAdapter builds upon the swappable push adapter functionality built into Parse Server for developers who wish to use OneSignal.

This also fixes incorrect error checking in src/RestWrite.js that prevented Installations from being created for Android devices when a device token is present.

Some wiki modifications will also be required to guide users on how to use and configure OneSignal and other possible push adapters.

[gfosco]

Cool. 👍

[tanmays]

Any docs on how to actually use this?

Edit:

Incase anyone else is searching this is the way I got it to work. Let me know if its right or there's a better one.

index.js of parse-server-example

var OneSignalPushAdapter = require('parse-server/lib/Adapters/Push/OneSignalPushAdapter');
var pushConfig = {
  oneSignalAppId:"your-one-signal-app-id",
  oneSignalApiKey:"your-one-signal-api-key"
  };
var oneSignalPushAdapter = new OneSignalPushAdapter(pushConfig);

var api = new ParseServer({
   databaseURI: 'xxx',
   cloud: 'xxx',
   appId:'xxx',
   masterKey:  'xxx',
   serverURL: 'xxx',
   push: {
     adapter: oneSignalPushAdapter
    }
});

[drew-gross]

Thanks! We'll add that to the docs.