WebAPI/WebActivities

Introduction

Web Activities is a counter-proposal to Web Intents. It is trying to limited the scope of the API to the following use case: APP A wants to delegate an activity to APP B. Web Activities isn't a discovery API or a communication API. Those things happen in the background and are completely transparent to the caller.

Proposed API

 interface ActivityOptions {
   attribute DOMString name;
   attribute Object?   data; // a dictionary
 };

 [Constructor(DOMString name)]
 interface ActivityHandlerDescription {
   attribute DOMString name; // default has to be passed to ctor
   attribute DOMString href; // default is current location
   attribute DOMString disposition; // going to be an enum with a default
   attribute boolean   returnValue;
   attribute Object?   filters; // a dictionary
 };

 interface ActivityRequestHandler {
   void postResult(any result);
   void postError(DOMString error);
   readonly attribute ActivityOptions source;
 };

 [Constructor(ActivityOptions options)]
 interface Activity : DOMRequest {
 };

 partial interface Navigator {
   DOMRequest registerActivityHandler(ActivityDescription d);
   void       unregisterActivityHandler(ActivityDescription d);
   bool       isActivityHandlerRegistered(ActivityHandler handler);
 };