Canvas SDK documentation pretty clearly describes the canvas app event flow in case user wishes to share something:

    name: "publisher.getPayload", onData: function (event)
        var post = {};

        post.feedItemType = "LinkPost";
        post.url = url;
        post.urlName = urlName;

            { name: "publisher.setPayload", payload: post });

But is there an event or a method (that canvas app can fire) to either

  • cancel the publishing action inside the publisher.getPayload handler, or
  • reset the state of a publisher canvas (clearing the "Share an update..." part, etc)?

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