Add testing for subscription from service workers

chrome/test/data/push_messaging/service_worker.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// NIST P-256 public key made available to tests. Must be an uncompressed
+// point in accordance with SEC1 2.3.3
+var applicationServerKey = new Uint8Array([

[Michael van Ouwerkerk, 2016/03/22 11:31:37]

To avoid duplication of this inscrutable thing you could move it to a shared
util file and use importScripts [1] to include it here, and a regular script tag
to include it in the test page.

[1]
https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope/importScripts

[harkness, 2016/03/24 16:56:23]

Done.

+  0x04, 0x55, 0x52, 0x6A, 0xA5, 0x6E, 0x8E, 0xAA, 0x47, 0x97, 0x36, 0x10, 0xC1,
+  0x66, 0x3C, 0x1E, 0x65, 0xBF, 0xA1, 0x7B, 0xEE, 0x48, 0xC9, 0xC6, 0xBB, 0xBF,
+  0x02, 0x18, 0x53, 0x72, 0x1D, 0x0C, 0x7B, 0xA9, 0xE3, 0x11, 0xB7, 0x03, 0x52,
+  0x21, 0xD3, 0x71, 0x90, 0x13, 0xA8, 0xC1, 0xCF, 0xED, 0x20, 0xF7, 0x1F, 0xD1,
+  0x7F, 0xF2, 0x76, 0xB6, 0x01, 0x20, 0xD8, 0x35, 0xA5, 0xD9, 0x3C, 0x43, 0xFD
+]);
+var pushSubscriptionOptions = {
+    userVisibleOnly: true
+};
+
 // The "onpush" event currently understands two values as message payload
 // data coming from the test. Any other input is passed through to the
 // document unchanged.
 //
 // "shownotification" - Display a Web Notification with event.waitUntil().
 // "shownotification-without-waituntil"
 //     - Display a Web Notification without using event.waitUntil().
 this.onpush = function(event) {
   if (event.data === null) {
     sendMessageToClients('push', '[NULL]');
@@ skipping 16 matching lines @@
     return;
   }
 
   event.waitUntil(result.then(function() {
     sendMessageToClients('push', data);
   }, function(ex) {
     sendMessageToClients('push', String(ex));
   }));
 };
 
+self.addEventListener('message', function handler (event) {
+  if (event.data.command == 'workerSubscribe') {
+    pushSubscriptionOptions.applicationServerKey = applicationServerKey.buffer;
+  } else if (event.data.command == 'workerSubscribePermissionFail') {
+    pushSubscriptionOptions.applicationServerKey = applicationServerKey.buffer;
+    pushSubscriptionOptions.userVisibleOnly = false;
+  } else if (event.data.command == 'workerSubscribeNoKey') {
+    // Nothing to set up
+  } else {
+    sendMessageToClients('message', 'error - unknown message request');
+    return;
+  }
+
+  self.registration.pushManager.subscribe(pushSubscriptionOptions)
+      .then(function(subscription) {
+        sendMessageToClients('message', subscription.endpoint);
+      }, function(error) {
+        sendErrorToClients(error);
+      });
+});
+
+function sendErrorToClients(error) {
+  sendMessageToClients('error', error.name + ' - ' + error.message);
+}
+
 function sendMessageToClients(type, data) {
   var message = JSON.stringify({
     'type': type,
     'data': data
   });
   clients.matchAll().then(function(clients) {
     clients.forEach(function(client) {
       client.postMessage(message);
     });
   }, function(error) {
     console.log(error);
   });
 }