Pushpad - Web Push Notifications

Pushpad is a service for sending push notifications from websites and web apps. It uses the Push API, which is a standard supported by all major browsers (Chrome, Firefox, Opera, Edge, Safari).

The notifications are delivered in real time even when the users are not on your website and you can target specific users or send bulk notifications.

Installation

Download the latest JAR from Github:

https://github.com/pushpad/pushpad-java/releases

You also need to download JSON.simple.

Getting started

First you need to sign up to Pushpad and create a project there.

Then set your authentication credentials:

String authToken = "5374d7dfeffa2eb49965624ba7596a09";
String projectId = "123";
Pushpad pushpad = new Pushpad(authToken, projectId);

• auth_token can be found in the user account settings.
• project_id can be found in the project settings.

Collecting user subscriptions to push notifications

You can subscribe the users to your notifications using the Javascript SDK, as described in the getting started guide.

If you need to generate the HMAC signature for the uid you can use this helper:

pushpad.signatureFor(currentUserId);

Sending push notifications

// build a new notification with title, main content and link
Notification notification = pushpad.buildNotification("Title", "Message", "https://example.com/my/page");

// optional, the icon of the notification (defaults to the project icon)
notification.iconUrl = "https://example.com/assets/square-icon.png";

// optional, the small icon displayed in the status bar (defaults to the project badge)
notification.badgeUrl = "https://example.com/assets/badge.png";

// optional, an image to display in the notification content
// see https://pushpad.xyz/docs/sending_images
notification.imageUrl = "https://example.com/assets/image.png";

// optional, drop the notification after this number of seconds if a device is offline 
notification.ttl = 604800;

// optional, prevent Chrome on desktop from automatically closing the notification after a few seconds
notification.requireInteraction = true;

// optional, enable this option if you want a mute notification without any sound
notification.silent = false;

// optional, enable this option only for time-sensitive alerts (e.g. incoming phone call)
notification.urgent = false;

// optional, a string that is passed as an argument to action button callbacks
notification.customData = "123";

// optional, add some action buttons to the notification
// see https://pushpad.xyz/docs/action_buttons
ActionButton button1 = new ActionButton("My Button 1"); // title
button1.targetUrl = "https://example.com/button-link"; // optional
button1.icon = "https://example.com/assets/button-icon.png"; // optional
button1.action = "myActionName"; // optional
notification.actionButtons = new ActionButton[]{button1};

// optional, bookmark the notification in the Pushpad dashboard (e.g. to highlight manual notifications)
notification.starred = true;

// optional, use this option only if you need to create scheduled notifications (max 5 days)
// see https://pushpad.xyz/docs/schedule_notifications
Instant tomorrow = Instant.now().plusSeconds(60*60*24);
notification.sendAt = tomorrow;

// optional, add the notification to custom categories for stats aggregation
// see https://pushpad.xyz/docs/monitoring
notification.customMetrics = new String[]{"examples", "another_metric"}; // up to 3 metrics per notification

try {
  // deliver the notification to a user
  notification.deliverTo("user100");

  // deliver the notification to a group of users
  String[] users = {"user123", "user100"};
  notification.deliverTo(users);

  // deliver to some users only if they have a given preference
  // e.g. only "users" who have a interested in "events" will be reached
  String[] tags1 = {"events"};
  notification.deliverTo(users, tags1);

  // deliver to segments
  // e.g. any subscriber that has the tag "segment1" OR "segment2"
  String[] tags2 = {"segment1", "segment2"};
  notification.broadcast(tags2);
  
  // you can use boolean expressions
  // they can include parentheses and the operators !, &&, || (from highest to lowest precedence)
  // https://pushpad.xyz/docs/tags
  String[] tags3 = {"zip_code:28865 && !optout:local_events || friend_of:Organizer123"};
  notification.broadcast(tags3);
  String[] tags4 = {"tag1 && tag2", "tag3"}; // equal to "tag1 && tag2 || tag3"
  notification.deliverTo(users, tags4);

  // deliver to everyone
  notification.broadcast();
} catch (DeliveryException e) {
  e.printStackTrace();
}

You can set the default values for most fields in the project settings. See also the docs for more information about notification fields.

If you try to send a notification to a user ID, but that user is not subscribed, that ID is simply ignored.

The methods above return a JSONObject:

• res.get("id") is the id of the notification on Pushpad
• res.get("scheduled") is the estimated reach of the notification (i.e. the number of devices to which the notification will be sent, which can be different from the number of users, since a user may receive notifications on multiple devices)
• res.get("uids") (deliverTo only) are the user IDs that will be actually reached by the notification because they are subscribed to your notifications. For example if you send a notification to {"uid1", "uid2", "uid3"}, but only "uid1" is subscribed, you will get {"uid1"} in response. Note that if a user has unsubscribed after the last notification sent to him, he may still be reported for one time as subscribed (this is due to the way the W3C Push API works).
• res.get("send_at") is present only for scheduled notifications. The fields scheduled and uids are not available in this case.

License

The library is available as open source under the terms of the MIT License.