Bumps to alpha version of node-apn

- Bumps engine
- Bumps CI
- Adds instructions for using custom adapter

Author: flovilmart

.nvmrc

@@ -1,2 +1 @@
-4.6
-
+8.9.1

.travis.yml

@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-- '4.6'
+- '8.9.1'
 after_success: "./node_modules/.bin/codecov"
 deploy:
   provider: npm

README.md

@@ -26,3 +26,36 @@ VERBOSE_PARSE_SERVER_PUSH_ADAPTER=1
 ```
 
 This will produce a more verbose output for all the push sending attempts
+
+### Using a custom version on parse-server
+
+#### Install the push adapter
+
+```
+npm install --save @parse/push-adapter@VERSION
+```
+
+Replace VERSION with the version you want to install.
+
+#### Configure parse-server
+
+```js
+const PushAdapter = require('@parse/push-adapter').default;
+const pushOptions = {
+  ios: { /* iOS push options */ } ,
+  android: { /* android push options */ }   
+}
+// starting 3.0.0
+const options = {
+  appId: "****",
+  masterKey: "****",
+  push: {
+    adapter: new PushAdapter(pushOptions),
+  },
+  /* ... */ 
+}
+
+const server = new ParseServer(options);
+
+/* continue with the initialization of parse-server */
+```

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@parse/push-adapter",
-  "version": "2.0.3",
+  "version": "3.0.0-alpha2",
   "description": "Base parse-server-push-adapter",
   "main": "lib/index.js",
   "files": [
@@ -33,12 +33,12 @@
     "nyc": "^11.0.2"
   },
   "dependencies": {
-    "apn": "^2.1.3",
+    "apn": "^3.0.0-alpha1",
     "@parse/node-gcm": "^0.14.0",
     "npmlog": "^4.0.2",
     "parse": "^1.9.2"
   },
   "engines": {
-    "node": ">= 4.6.0"
+    "node": ">= 8.9.1"
   }
 }

src/ParsePushAdapter.js

@@ -21,9 +21,10 @@ export default class ParsePushAdapter {
     let pushTypes = Object.keys(pushConfig);
 
     for (let pushType of pushTypes) {
-      if (this.validPushTypes.indexOf(pushType) < 0) {
+      // adapter may be passed as part of the parse-server initialization
+      if (this.validPushTypes.indexOf(pushType) < 0 && pushType != 'adapter') {
         throw new Parse.Error(Parse.Error.PUSH_MISCONFIGURED,
-                              'Push to ' + pushType + ' is not supported');
+                             'Push to ' + pushType + ' is not supported');
       }
       switch (pushType) {
         case 'ios':