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Push Notifications
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==================
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Overview
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--------
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::
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+--------------------+ +-------------------+
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Matrix HTTP | | | |
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Notification Protocol | App Developer | | Device Vendor |
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+-------------------+ | +----------------+ | | +---------------+ |
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| | | | | | | | | |
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| Matrix Home Server+-----> Push Gateway | +---> Push Provider | |
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| | | | | | | | | |
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+-^-----------------+ | +----------------+ | | +----+----------+ |
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Matrix | | | | | |
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Client/Server API + | | | | |
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| | +--------------------+ +-------------------+
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| +--+-+ |
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| | <------------------------------------------+
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+---+ |
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| | Provider Push Protocol
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+----+
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Mobile Device or Client
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Matrix supports push notifications as a first class citizen. Home Servers send
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notifications of user events to user-configured HTTP endpoints. User may also
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configure a number of rules that determine what events generate notifications.
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These are all stored and managed by the users home server such that settings can
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be reused between client apps as appropriate.
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The above diagram shows the flow of push notifications being sent to a handset
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where push notifications are submitted via the handset vendor, such as Apple's
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APNS or Google's GCM. This happens as follows:
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1. The client app signs in to a Matrix Home Server
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2. The client app registers with its vendor's Push Notification provider and
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obtains a routing token of some kind.
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3. The mobile app, uses the Matrix client/server API to add a 'pusher',
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providing the URL of a specific Push Gateway which is configured for that
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application. It also provides the routing token it has acquired from the
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Push Notification Provider.
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4. The Home Server starts sending notification HTTP requests to the Push
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Gateway using the supplied URL. The Push Gateway relays this notification to
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the Push Notification Provider, passing the routing token along with any
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necessary private credentials the provider requires to send push
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notifications.
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5. The Push Notification provider sends the notification to the device.
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Nomenclature
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------------
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Pusher
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A 'pusher' is an activity in the Home Server that manages the sending
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of HTTP notifications for a single device of a single user.
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Push Rules
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A push rule is a single rule, configured by a matrix user, that gives
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instructions to the Home Server about whether an event should be notified
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about and how given a set of conditions. Matrix clients allow the user to
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configure these. They create and view them via the Client to Server REST API.
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Push Gateway
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A push gateway is a server that receives HTTP event notifications from Home
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Servers and passes them on to a different protocol such as APNS for iOS
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devices or GCM for Android devices. Matrix.org provides a reference push
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gateway, 'sygnal'. A client app tells a Home Server what push gateway
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to send notifications to when it sets up a pusher.
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For information on the client-server API for setting pushers and push rules, see
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the Client Server API section. For more information on the format of HTTP
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notifications, see the HTTP Notification Protocol section.
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