Added built-in noVNC support.

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();