Added built-in noVNC support.

public/novnc/core/input/util.js

@@ -0,0 +1,164 @@
+import keysyms from "./keysymdef.js";
+import vkeys from "./vkeys.js";
+import fixedkeys from "./fixedkeys.js";
+import DOMKeyTable from "./domkeytable.js";
+import * as browser from "../util/browser.js";
+
+// Get 'KeyboardEvent.code', handling legacy browsers
+export function getKeycode(evt) {
+    // Are we getting proper key identifiers?
+    // (unfortunately Firefox and Chrome are crappy here and gives
+    // us an empty string on some platforms, rather than leaving it
+    // undefined)
+    if (evt.code) {
+        // Mozilla isn't fully in sync with the spec yet
+        switch (evt.code) {
+            case 'OSLeft': return 'MetaLeft';
+            case 'OSRight': return 'MetaRight';
+        }
+
+        return evt.code;
+    }
+
+    // The de-facto standard is to use Windows Virtual-Key codes
+    // in the 'keyCode' field for non-printable characters. However
+    // Webkit sets it to the same as charCode in 'keypress' events.
+    if ((evt.type !== 'keypress') && (evt.keyCode in vkeys)) {
+        let code = vkeys[evt.keyCode];
+
+        // macOS has messed up this code for some reason
+        if (browser.isMac() && (code === 'ContextMenu')) {
+            code = 'MetaRight';
+        }
+
+        // The keyCode doesn't distinguish between left and right
+        // for the standard modifiers
+        if (evt.location === 2) {
+            switch (code) {
+                case 'ShiftLeft': return 'ShiftRight';
+                case 'ControlLeft': return 'ControlRight';
+                case 'AltLeft': return 'AltRight';
+            }
+        }
+
+        // Nor a bunch of the numpad keys
+        if (evt.location === 3) {
+            switch (code) {
+                case 'Delete': return 'NumpadDecimal';
+                case 'Insert': return 'Numpad0';
+                case 'End': return 'Numpad1';
+                case 'ArrowDown': return 'Numpad2';
+                case 'PageDown': return 'Numpad3';
+                case 'ArrowLeft': return 'Numpad4';
+                case 'ArrowRight': return 'Numpad6';
+                case 'Home': return 'Numpad7';
+                case 'ArrowUp': return 'Numpad8';
+                case 'PageUp': return 'Numpad9';
+                case 'Enter': return 'NumpadEnter';
+            }
+        }
+
+        return code;
+    }
+
+    return 'Unidentified';
+}
+
+// Get 'KeyboardEvent.key', handling legacy browsers
+export function getKey(evt) {
+    // Are we getting a proper key value?
+    if (evt.key !== undefined) {
+        // IE and Edge use some ancient version of the spec
+        // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/8860571/
+        switch (evt.key) {
+            case 'Spacebar': return ' ';
+            case 'Esc': return 'Escape';
+            case 'Scroll': return 'ScrollLock';
+            case 'Win': return 'Meta';
+            case 'Apps': return 'ContextMenu';
+            case 'Up': return 'ArrowUp';
+            case 'Left': return 'ArrowLeft';
+            case 'Right': return 'ArrowRight';
+            case 'Down': return 'ArrowDown';
+            case 'Del': return 'Delete';
+            case 'Divide': return '/';
+            case 'Multiply': return '*';
+            case 'Subtract': return '-';
+            case 'Add': return '+';
+            case 'Decimal': return evt.char;
+        }
+
+        // Mozilla isn't fully in sync with the spec yet
+        switch (evt.key) {
+            case 'OS': return 'Meta';
+        }
+
+        // iOS leaks some OS names
+        switch (evt.key) {
+            case 'UIKeyInputUpArrow': return 'ArrowUp';
+            case 'UIKeyInputDownArrow': return 'ArrowDown';
+            case 'UIKeyInputLeftArrow': return 'ArrowLeft';
+            case 'UIKeyInputRightArrow': return 'ArrowRight';
+            case 'UIKeyInputEscape': return 'Escape';
+        }
+
+        // IE and Edge have broken handling of AltGraph so we cannot
+        // trust them for printable characters
+        if ((evt.key.length !== 1) || (!browser.isIE() && !browser.isEdge())) {
+            return evt.key;
+        }
+    }
+
+    // Try to deduce it based on the physical key
+    const code = getKeycode(evt);
+    if (code in fixedkeys) {
+        return fixedkeys[code];
+    }
+
+    // If that failed, then see if we have a printable character
+    if (evt.charCode) {
+        return String.fromCharCode(evt.charCode);
+    }
+
+    // At this point we have nothing left to go on
+    return 'Unidentified';
+}
+
+// Get the most reliable keysym value we can get from a key event
+export function getKeysym(evt) {
+    const key = getKey(evt);
+
+    if (key === 'Unidentified') {
+        return null;
+    }
+
+    // First look up special keys
+    if (key in DOMKeyTable) {
+        let location = evt.location;
+
+        // Safari screws up location for the right cmd key
+        if ((key === 'Meta') && (location === 0)) {
+            location = 2;
+        }
+
+        if ((location === undefined) || (location > 3)) {
+            location = 0;
+        }
+
+        return DOMKeyTable[key][location];
+    }
+
+    // Now we need to look at the Unicode symbol instead
+
+    // Special key? (FIXME: Should have been caught earlier)
+    if (key.length !== 1) {
+        return null;
+    }
+
+    const codepoint = key.charCodeAt();
+    if (codepoint) {
+        return keysyms.lookup(codepoint);
+    }
+
+    return null;
+}