Added built-in noVNC support.

public/novnc/core/util/browser.js

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+/*
+ * noVNC: HTML5 VNC client
+ * Copyright (C) 2018 The noVNC Authors
+ * Licensed under MPL 2.0 (see LICENSE.txt)
+ *
+ * See README.md for usage and integration instructions.
+ */
+
+import * as Log from './logging.js';
+
+// Touch detection
+export let isTouchDevice = ('ontouchstart' in document.documentElement) ||
+                                 // requried for Chrome debugger
+                                 (document.ontouchstart !== undefined) ||
+                                 // required for MS Surface
+                                 (navigator.maxTouchPoints > 0) ||
+                                 (navigator.msMaxTouchPoints > 0);
+window.addEventListener('touchstart', function onFirstTouch() {
+    isTouchDevice = true;
+    window.removeEventListener('touchstart', onFirstTouch, false);
+}, false);
+
+
+// The goal is to find a certain physical width, the devicePixelRatio
+// brings us a bit closer but is not optimal.
+export let dragThreshold = 10 * (window.devicePixelRatio || 1);
+
+let _supportsCursorURIs = false;
+
+try {
+    const target = document.createElement('canvas');
+    target.style.cursor = 'url("data:image/x-icon;base64,AAACAAEACAgAAAIAAgA4AQAAFgAAACgAAAAIAAAAEAAAAAEAIAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAD/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////AAAAAAAAAAAAAAAAAAAAAA==") 2 2, default';
+
+    if (target.style.cursor) {
+        Log.Info("Data URI scheme cursor supported");
+        _supportsCursorURIs = true;
+    } else {
+        Log.Warn("Data URI scheme cursor not supported");
+    }
+} catch (exc) {
+    Log.Error("Data URI scheme cursor test exception: " + exc);
+}
+
+export const supportsCursorURIs = _supportsCursorURIs;
+
+let _supportsImageMetadata = false;
+try {
+    new ImageData(new Uint8ClampedArray(4), 1, 1);
+    _supportsImageMetadata = true;
+} catch (ex) {
+    // ignore failure
+}
+export const supportsImageMetadata = _supportsImageMetadata;
+
+export function isMac() {
+    return navigator && !!(/mac/i).exec(navigator.platform);
+}
+
+export function isWindows() {
+    return navigator && !!(/win/i).exec(navigator.platform);
+}
+
+export function isIOS() {
+    return navigator &&
+           (!!(/ipad/i).exec(navigator.platform) ||
+            !!(/iphone/i).exec(navigator.platform) ||
+            !!(/ipod/i).exec(navigator.platform));
+}
+
+export function isAndroid() {
+    return navigator && !!(/android/i).exec(navigator.userAgent);
+}
+
+export function isSafari() {
+    return navigator && (navigator.userAgent.indexOf('Safari') !== -1 &&
+                         navigator.userAgent.indexOf('Chrome') === -1);
+}
+
+export function isIE() {
+    return navigator && !!(/trident/i).exec(navigator.userAgent);
+}
+
+export function isEdge() {
+    return navigator && !!(/edge/i).exec(navigator.userAgent);
+}
+
+export function isFirefox() {
+    return navigator && !!(/firefox/i).exec(navigator.userAgent);
+}
+

public/novnc/core/util/cursor.js

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+/*
+ * noVNC: HTML5 VNC client
+ * Copyright (C) 2018 The noVNC Authors
+ * Licensed under MPL 2.0 or any later version (see LICENSE.txt)
+ */
+
+import { supportsCursorURIs, isTouchDevice } from './browser.js';
+
+const useFallback = !supportsCursorURIs || isTouchDevice;
+
+export default class Cursor {
+    constructor() {
+        this._target = null;
+
+        this._canvas = document.createElement('canvas');
+
+        if (useFallback) {
+            this._canvas.style.position = 'fixed';
+            this._canvas.style.zIndex = '65535';
+            this._canvas.style.pointerEvents = 'none';
+            // Can't use "display" because of Firefox bug #1445997
+            this._canvas.style.visibility = 'hidden';
+            document.body.appendChild(this._canvas);
+        }
+
+        this._position = { x: 0, y: 0 };
+        this._hotSpot = { x: 0, y: 0 };
+
+        this._eventHandlers = {
+            'mouseover': this._handleMouseOver.bind(this),
+            'mouseleave': this._handleMouseLeave.bind(this),
+            'mousemove': this._handleMouseMove.bind(this),
+            'mouseup': this._handleMouseUp.bind(this),
+            'touchstart': this._handleTouchStart.bind(this),
+            'touchmove': this._handleTouchMove.bind(this),
+            'touchend': this._handleTouchEnd.bind(this),
+        };
+    }
+
+    attach(target) {
+        if (this._target) {
+            this.detach();
+        }
+
+        this._target = target;
+
+        if (useFallback) {
+            // FIXME: These don't fire properly except for mouse
+            ///       movement in IE. We want to also capture element
+            //        movement, size changes, visibility, etc.
+            const options = { capture: true, passive: true };
+            this._target.addEventListener('mouseover', this._eventHandlers.mouseover, options);
+            this._target.addEventListener('mouseleave', this._eventHandlers.mouseleave, options);
+            this._target.addEventListener('mousemove', this._eventHandlers.mousemove, options);
+            this._target.addEventListener('mouseup', this._eventHandlers.mouseup, options);
+
+            // There is no "touchleave" so we monitor touchstart globally
+            window.addEventListener('touchstart', this._eventHandlers.touchstart, options);
+            this._target.addEventListener('touchmove', this._eventHandlers.touchmove, options);
+            this._target.addEventListener('touchend', this._eventHandlers.touchend, options);
+        }
+
+        this.clear();
+    }
+
+    detach() {
+        if (useFallback) {
+            const options = { capture: true, passive: true };
+            this._target.removeEventListener('mouseover', this._eventHandlers.mouseover, options);
+            this._target.removeEventListener('mouseleave', this._eventHandlers.mouseleave, options);
+            this._target.removeEventListener('mousemove', this._eventHandlers.mousemove, options);
+            this._target.removeEventListener('mouseup', this._eventHandlers.mouseup, options);
+
+            window.removeEventListener('touchstart', this._eventHandlers.touchstart, options);
+            this._target.removeEventListener('touchmove', this._eventHandlers.touchmove, options);
+            this._target.removeEventListener('touchend', this._eventHandlers.touchend, options);
+        }
+
+        this._target = null;
+    }
+
+    change(rgba, hotx, hoty, w, h) {
+        if ((w === 0) || (h === 0)) {
+            this.clear();
+            return;
+        }
+
+        this._position.x = this._position.x + this._hotSpot.x - hotx;
+        this._position.y = this._position.y + this._hotSpot.y - hoty;
+        this._hotSpot.x = hotx;
+        this._hotSpot.y = hoty;
+
+        let ctx = this._canvas.getContext('2d');
+
+        this._canvas.width = w;
+        this._canvas.height = h;
+
+        let img;
+        try {
+            // IE doesn't support this
+            img = new ImageData(new Uint8ClampedArray(rgba), w, h);
+        } catch (ex) {
+            img = ctx.createImageData(w, h);
+            img.data.set(new Uint8ClampedArray(rgba));
+        }
+        ctx.clearRect(0, 0, w, h);
+        ctx.putImageData(img, 0, 0);
+
+        if (useFallback) {
+            this._updatePosition();
+        } else {
+            let url = this._canvas.toDataURL();
+            this._target.style.cursor = 'url(' + url + ')' + hotx + ' ' + hoty + ', default';
+        }
+    }
+
+    clear() {
+        this._target.style.cursor = 'none';
+        this._canvas.width = 0;
+        this._canvas.height = 0;
+        this._position.x = this._position.x + this._hotSpot.x;
+        this._position.y = this._position.y + this._hotSpot.y;
+        this._hotSpot.x = 0;
+        this._hotSpot.y = 0;
+    }
+
+    _handleMouseOver(event) {
+        // This event could be because we're entering the target, or
+        // moving around amongst its sub elements. Let the move handler
+        // sort things out.
+        this._handleMouseMove(event);
+    }
+
+    _handleMouseLeave(event) {
+        this._hideCursor();
+    }
+
+    _handleMouseMove(event) {
+        this._updateVisibility(event.target);
+
+        this._position.x = event.clientX - this._hotSpot.x;
+        this._position.y = event.clientY - this._hotSpot.y;
+
+        this._updatePosition();
+    }
+
+    _handleMouseUp(event) {
+        // We might get this event because of a drag operation that
+        // moved outside of the target. Check what's under the cursor
+        // now and adjust visibility based on that.
+        let target = document.elementFromPoint(event.clientX, event.clientY);
+        this._updateVisibility(target);
+    }
+
+    _handleTouchStart(event) {
+        // Just as for mouseover, we let the move handler deal with it
+        this._handleTouchMove(event);
+    }
+
+    _handleTouchMove(event) {
+        this._updateVisibility(event.target);
+
+        this._position.x = event.changedTouches[0].clientX - this._hotSpot.x;
+        this._position.y = event.changedTouches[0].clientY - this._hotSpot.y;
+
+        this._updatePosition();
+    }
+
+    _handleTouchEnd(event) {
+        // Same principle as for mouseup
+        let target = document.elementFromPoint(event.changedTouches[0].clientX,
+                                               event.changedTouches[0].clientY);
+        this._updateVisibility(target);
+    }
+
+    _showCursor() {
+        if (this._canvas.style.visibility === 'hidden') {
+            this._canvas.style.visibility = '';
+        }
+    }
+
+    _hideCursor() {
+        if (this._canvas.style.visibility !== 'hidden') {
+            this._canvas.style.visibility = 'hidden';
+        }
+    }
+
+    // Should we currently display the cursor?
+    // (i.e. are we over the target, or a child of the target without a
+    // different cursor set)
+    _shouldShowCursor(target) {
+        // Easy case
+        if (target === this._target) {
+            return true;
+        }
+        // Other part of the DOM?
+        if (!this._target.contains(target)) {
+            return false;
+        }
+        // Has the child its own cursor?
+        // FIXME: How can we tell that a sub element has an
+        //        explicit "cursor: none;"?
+        if (window.getComputedStyle(target).cursor !== 'none') {
+            return false;
+        }
+        return true;
+    }
+
+    _updateVisibility(target) {
+        if (this._shouldShowCursor(target)) {
+            this._showCursor();
+        } else {
+            this._hideCursor();
+        }
+    }
+
+    _updatePosition() {
+        this._canvas.style.left = this._position.x + "px";
+        this._canvas.style.top = this._position.y + "px";
+    }
+}

public/novnc/core/util/events.js

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+/*
+ * noVNC: HTML5 VNC client
+ * Copyright (C) 2018 The noVNC Authors
+ * Licensed under MPL 2.0 (see LICENSE.txt)
+ *
+ * See README.md for usage and integration instructions.
+ */
+
+/*
+ * Cross-browser event and position routines
+ */
+
+export function getPointerEvent(e) {
+    return e.changedTouches ? e.changedTouches[0] : e.touches ? e.touches[0] : e;
+}
+
+export function stopEvent(e) {
+    e.stopPropagation();
+    e.preventDefault();
+}
+
+// Emulate Element.setCapture() when not supported
+let _captureRecursion = false;
+let _captureElem = null;
+function _captureProxy(e) {
+    // Recursion protection as we'll see our own event
+    if (_captureRecursion) return;
+
+    // Clone the event as we cannot dispatch an already dispatched event
+    const newEv = new e.constructor(e.type, e);
+
+    _captureRecursion = true;
+    _captureElem.dispatchEvent(newEv);
+    _captureRecursion = false;
+
+    // Avoid double events
+    e.stopPropagation();
+
+    // Respect the wishes of the redirected event handlers
+    if (newEv.defaultPrevented) {
+        e.preventDefault();
+    }
+
+    // Implicitly release the capture on button release
+    if (e.type === "mouseup") {
+        releaseCapture();
+    }
+}
+
+// Follow cursor style of target element
+function _captureElemChanged() {
+    const captureElem = document.getElementById("noVNC_mouse_capture_elem");
+    captureElem.style.cursor = window.getComputedStyle(_captureElem).cursor;
+}
+
+const _captureObserver = new MutationObserver(_captureElemChanged);
+
+let _captureIndex = 0;
+
+export function setCapture(elem) {
+    if (elem.setCapture) {
+
+        elem.setCapture();
+
+        // IE releases capture on 'click' events which might not trigger
+        elem.addEventListener('mouseup', releaseCapture);
+
+    } else {
+        // Release any existing capture in case this method is
+        // called multiple times without coordination
+        releaseCapture();
+
+        let captureElem = document.getElementById("noVNC_mouse_capture_elem");
+
+        if (captureElem === null) {
+            captureElem = document.createElement("div");
+            captureElem.id = "noVNC_mouse_capture_elem";
+            captureElem.style.position = "fixed";
+            captureElem.style.top = "0px";
+            captureElem.style.left = "0px";
+            captureElem.style.width = "100%";
+            captureElem.style.height = "100%";
+            captureElem.style.zIndex = 10000;
+            captureElem.style.display = "none";
+            document.body.appendChild(captureElem);
+
+            // This is to make sure callers don't get confused by having
+            // our blocking element as the target
+            captureElem.addEventListener('contextmenu', _captureProxy);
+
+            captureElem.addEventListener('mousemove', _captureProxy);
+            captureElem.addEventListener('mouseup', _captureProxy);
+        }
+
+        _captureElem = elem;
+        _captureIndex++;
+
+        // Track cursor and get initial cursor
+        _captureObserver.observe(elem, {attributes: true});
+        _captureElemChanged();
+
+        captureElem.style.display = "";
+
+        // We listen to events on window in order to keep tracking if it
+        // happens to leave the viewport
+        window.addEventListener('mousemove', _captureProxy);
+        window.addEventListener('mouseup', _captureProxy);
+    }
+}
+
+export function releaseCapture() {
+    if (document.releaseCapture) {
+
+        document.releaseCapture();
+
+    } else {
+        if (!_captureElem) {
+            return;
+        }
+
+        // There might be events already queued, so we need to wait for
+        // them to flush. E.g. contextmenu in Microsoft Edge
+        window.setTimeout((expected) => {
+            // Only clear it if it's the expected grab (i.e. no one
+            // else has initiated a new grab)
+            if (_captureIndex === expected) {
+                _captureElem = null;
+            }
+        }, 0, _captureIndex);
+
+        _captureObserver.disconnect();
+
+        const captureElem = document.getElementById("noVNC_mouse_capture_elem");
+        captureElem.style.display = "none";
+
+        window.removeEventListener('mousemove', _captureProxy);
+        window.removeEventListener('mouseup', _captureProxy);
+    }
+}

public/novnc/core/util/eventtarget.js

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+/*
+ * noVNC: HTML5 VNC client
+ * Copyright (C) 2018 The noVNC Authors
+ * Licensed under MPL 2.0 (see LICENSE.txt)
+ *
+ * See README.md for usage and integration instructions.
+ */
+
+export default class EventTargetMixin {
+    constructor() {
+        this._listeners = new Map();
+    }
+
+    addEventListener(type, callback) {
+        if (!this._listeners.has(type)) {
+            this._listeners.set(type, new Set());
+        }
+        this._listeners.get(type).add(callback);
+    }
+
+    removeEventListener(type, callback) {
+        if (this._listeners.has(type)) {
+            this._listeners.get(type).delete(callback);
+        }
+    }
+
+    dispatchEvent(event) {
+        if (!this._listeners.has(event.type)) {
+            return true;
+        }
+        this._listeners.get(event.type)
+            .forEach(callback => callback.call(this, event));
+        return !event.defaultPrevented;
+    }
+}

public/novnc/core/util/logging.js

@@ -0,0 +1,56 @@
+/*
+ * noVNC: HTML5 VNC client
+ * Copyright (C) 2018 The noVNC Authors
+ * Licensed under MPL 2.0 (see LICENSE.txt)
+ *
+ * See README.md for usage and integration instructions.
+ */
+
+/*
+ * Logging/debug routines
+ */
+
+let _log_level = 'warn';
+
+let Debug = () => {};
+let Info = () => {};
+let Warn = () => {};
+let Error = () => {};
+
+export function init_logging(level) {
+    if (typeof level === 'undefined') {
+        level = _log_level;
+    } else {
+        _log_level = level;
+    }
+
+    Debug = Info = Warn = Error = () => {};
+
+    if (typeof window.console !== "undefined") {
+        /* eslint-disable no-console, no-fallthrough */
+        switch (level) {
+            case 'debug':
+                Debug = console.debug.bind(window.console);
+            case 'info':
+                Info  = console.info.bind(window.console);
+            case 'warn':
+                Warn  = console.warn.bind(window.console);
+            case 'error':
+                Error = console.error.bind(window.console);
+            case 'none':
+                break;
+            default:
+                throw new window.Error("invalid logging type '" + level + "'");
+        }
+        /* eslint-enable no-console, no-fallthrough */
+    }
+}
+
+export function get_logging() {
+    return _log_level;
+}
+
+export { Debug, Info, Warn, Error };
+
+// Initialize logging level
+init_logging();

public/novnc/core/util/polyfill.js

@@ -0,0 +1,54 @@
+/*
+ * noVNC: HTML5 VNC client
+ * Copyright (C) 2018 The noVNC Authors
+ * Licensed under MPL 2.0 or any later version (see LICENSE.txt)
+ */
+
+/* Polyfills to provide new APIs in old browsers */
+
+/* Object.assign() (taken from MDN) */
+if (typeof Object.assign != 'function') {
+    // Must be writable: true, enumerable: false, configurable: true
+    Object.defineProperty(Object, "assign", {
+        value: function assign(target, varArgs) { // .length of function is 2
+            'use strict';
+            if (target == null) { // TypeError if undefined or null
+                throw new TypeError('Cannot convert undefined or null to object');
+            }
+
+            const to = Object(target);
+
+            for (let index = 1; index < arguments.length; index++) {
+                const nextSource = arguments[index];
+
+                if (nextSource != null) { // Skip over if undefined or null
+                    for (let nextKey in nextSource) {
+                        // Avoid bugs when hasOwnProperty is shadowed
+                        if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
+                            to[nextKey] = nextSource[nextKey];
+                        }
+                    }
+                }
+            }
+            return to;
+        },
+        writable: true,
+        configurable: true
+    });
+}
+
+/* CustomEvent constructor (taken from MDN) */
+(() => {
+    function CustomEvent(event, params) {
+        params = params || { bubbles: false, cancelable: false, detail: undefined };
+        const evt = document.createEvent( 'CustomEvent' );
+        evt.initCustomEvent( event, params.bubbles, params.cancelable, params.detail );
+        return evt;
+    }
+
+    CustomEvent.prototype = window.Event.prototype;
+
+    if (typeof window.CustomEvent !== "function") {
+        window.CustomEvent = CustomEvent;
+    }
+})();

public/novnc/core/util/strings.js

@@ -0,0 +1,14 @@
+/*
+ * noVNC: HTML5 VNC client
+ * Copyright (C) 2018 The noVNC Authors
+ * Licensed under MPL 2.0 (see LICENSE.txt)
+ *
+ * See README.md for usage and integration instructions.
+ */
+
+/*
+ * Decode from UTF-8
+ */
+export function decodeUTF8(utf8string) {
+    return decodeURIComponent(escape(utf8string));
+}