node-alljoyn/alljoyn/alljoyn_js/js/npapi/alljoyn_init.js

Access Alljoyn service functions

/*
 * Copyright (c) 2012, AllSeen Alliance. All rights reserved.
 *
 *    Permission to use, copy, modify, and/or distribute this software for any
 *    purpose with or without fee is hereby granted, provided that the above
 *    copyright notice and this permission notice appear in all copies.
 *
 *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
(function() {
    var bus = null,
        permissionLevel,
        requestPermission,
        found,
        i;

    /*
     * Check if AllJoyn is already initialized.
     */
    if (window.org && window.org.alljoyn) {
        return;
    }

    if ((typeof navigator.mimeTypes != 'undefined') && navigator.mimeTypes['application/x-alljoyn']) {
        /*
         * Create an object element that will load the AllJoyn plugin.
         */
        bus = document.createElement('object');
        bus.type = 'application/x-alljoyn';
        /*
         * Hide the element.  It's necessary to use the method below instead of changing the
         * visibility to ensure that the plugin has a top-level window for the permission request
         * dialog.
         */
        bus.style.position = 'absolute';
        bus.style.left = 0;
        bus.style.top = -500;
        bus.style.width = 1;
        bus.style.height = 1;
        bus.style.overflow = 'hidden';
        document.documentElement.appendChild(bus);
        /*
         * Check that everything was loaded correctly.
         */
        if (bus && (typeof bus.BusAttachment === 'undefined')) {
            bus = null;
        }
    }
    if (!bus) {
        return;
    }

    /*
     * Put the AllJoyn namespace object in the right place.
     */
    if (!window.org) {
        org = {};
    }
    if (!window.org.alljoyn) {
        window.org.alljoyn = {bus: bus};
    }

    /*
     * Until the feature permissions API is supported and available to the plugin, use the fallback
     * implementation in the plugin.
     */
    if (!window.navigator.USER_ALLOWED) {
        window.navigator.USER_ALLOWED = bus.USER_ALLOWED;
        window.navigator.DEFAULT_ALLOWED = bus.DEFAULT_ALLOWED;
        window.navigator.DEFAULT_DENIED = bus.DEFAULT_DENIED;
        window.navigator.USER_DENIED = bus.USER_DENIED;
    }

    permissionLevel = window.navigator.permissionLevel;
    window.navigator.permissionLevel = function(feature) {
        if (feature === 'org.alljoyn.bus') {
            return bus.permissionLevel(feature);
        } else {
            return permissionLevel(feature);
        }
    }

    requestPermission = window.navigator.requestPermission;
    window.navigator.requestPermission = function(feature, callback) {
        if (feature === 'org.alljoyn.bus') {
            return bus.requestPermission(feature, callback);
        } else {
            return requestPermission(feature, callback);
        }
    }

    found = false;
    for (i = 0; window.navigator.privilegedFeatures && (i < window.navigator.privilegedFeatures.length); ++i) {
        if (window.navigator.privilegedFeatures[i] === 'org.alljoyn.bus') {
            found = true;
        }
    }
    if (!found) {
        if (window.navigator.privilegedFeatures) {
            window.navigator.privilegedFeatures.push('org.alljoyn.bus');
        } else {
            window.navigator.privilegedFeatures = bus.privilegedFeatures;
        }
    }
})();