From 26a265a3ebd5c63d376ccd0679602c64d9929a0f Mon Sep 17 00:00:00 2001
From: Eric Franz <efranz@osc.edu>
Date: Tue, 10 Dec 2019 10:18:13 -0500
Subject: [PATCH] Copy paste NoVNC chrome (#335)

NoVNC mod for streamlined copy/paste in chrome https://github.com/novnc/noVNC/pull/1301

If clipboard-read permission results in TypeError we just ignore it
that way if in the future Firefox or other browser defines clipboard.readText but
does not support the read permission we don't get a bunch of console warnings
---
 apps/dashboard/public/noVNC-1.0.0/app.v1.js | 59 +++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/apps/dashboard/public/noVNC-1.0.0/app.v1.js b/apps/dashboard/public/noVNC-1.0.0/app.v1.js
index 1a62954d6c..ab18fdcb17 100644
--- a/apps/dashboard/public/noVNC-1.0.0/app.v1.js
+++ b/apps/dashboard/public/noVNC-1.0.0/app.v1.js
@@ -489,6 +489,8 @@ var UI = {
         document.getElementById("noVNC_clipboard_button").addEventListener('click', UI.toggleClipboardPanel);
         document.getElementById("noVNC_clipboard_text").addEventListener('change', UI.clipboardSend);
         document.getElementById("noVNC_clipboard_clear_button").addEventListener('click', UI.clipboardClear);
+
+        document.getElementById("noVNC_clipboard_text").addEventListener('input', UI.syncClipboardPanelToLocalClipboard);
     },
 
     // Add a call to save settings when the element changes,
@@ -1052,6 +1054,49 @@ var UI = {
      *   CLIPBOARD
      * ------v------*/
 
+    // Read and write text to local clipboard is currently only supported in Chrome 66+ and Opera53+
+    // further information at https://developer.mozilla.org/en-US/docs/Web/API/Clipboard
+
+    writeLocalClipboard(text) {
+        if (typeof navigator.clipboard !== "undefined" && typeof navigator.clipboard.writeText !== "undefined" &&
+            typeof navigator.permissions !== "undefined" && typeof navigator.permissions.query !== "undefined"
+           ) {
+            navigator.permissions.query({name: 'clipboard-write'})
+            .then(() => navigator.clipboard.writeText(text))
+            .then(() => {
+                let debugMessage = text.substr(0, 40) + "...";
+                Log.Debug('>> UI.setClipboardText: navigator.clipboard.writeText with ' + debugMessage);
+            })
+            .catch((err) => {
+                if(err.name !== 'TypeError'){
+                    Log.Error(">> UI.setClipboardText: Failed to write system clipboard (trying to copy from NoVNC clipboard)");
+                }
+            });
+        }
+    },
+
+    readLocalClipboard() {
+        // navigator.clipboard and navigator.clipbaord.readText is not available in all browsers
+        if (typeof navigator.clipboard !== "undefined" && typeof navigator.clipboard.readText !== "undefined" &&
+            typeof navigator.permissions !== "undefined" && typeof navigator.permissions.query !== "undefined"
+           ) {
+            navigator.permissions.query({name: 'clipboard-read'})
+            .then(() => navigator.clipboard.readText())
+            .then((clipboardText) => {
+                const text = document.getElementById('noVNC_clipboard_text').value;
+                if (clipboardText !== text) {
+                    document.getElementById('noVNC_clipboard_text').value = clipboardText;
+                    UI.clipboardSend();
+                }
+            })
+            .catch((err) => {
+                if(err.name !== 'TypeError'){
+                  Log.Warn("<< UI.readLocalClipboard: Failed to read system clipboard-: " + err);
+                }
+            });
+        }
+    },
+
     openClipboardPanel: function () {
         UI.closeAllPanels();
         UI.openControlbar();
@@ -1076,11 +1121,13 @@ var UI = {
     clipboardReceive: function (e) {
         Log.Debug(">> UI.clipboardReceive: " + e.detail.text.substr(0, 40) + "...");
         document.getElementById('noVNC_clipboard_text').value = e.detail.text;
+        UI.writeLocalClipboard(e.detail.text);
         Log.Debug("<< UI.clipboardReceive");
     },
 
     clipboardClear: function () {
         document.getElementById('noVNC_clipboard_text').value = "";
+        UI.writeLocalClipboard("");
         UI.rfb.clipboardPasteFrom("");
     },
 
@@ -1090,6 +1137,12 @@ var UI = {
         UI.rfb.clipboardPasteFrom(text);
         Log.Debug("<< UI.clipboardSend");
     },
+    syncClipboardPanelToLocalClipboard() {
+        // Reads text from clipboard panel and set it to local clipboard
+        // Mainly used to synchronize clipboard panel with local clipboard
+        const text = document.getElementById('noVNC_clipboard_text').value;
+        UI.writeLocalClipboard(text);
+    },
 
     /* ------^-------
      *  /CLIPBOARD
@@ -1159,6 +1212,9 @@ var UI = {
             UI.updatePowerButton();
         });
         UI.rfb.addEventListener("clipboard", UI.clipboardReceive);
+
+        UI.rfb.oncanvasfocus = UI.readLocalClipboard;
+
         UI.rfb.addEventListener("bell", UI.bell);
         UI.rfb.addEventListener("desktopname", UI.updateDesktopName);
         UI.rfb.clipViewport = UI.getSetting('view_clip');
@@ -6468,6 +6524,8 @@ function RFB(target, url, options) {
     // time to set up callbacks
     setTimeout(this._updateConnectionState.bind(this, 'connecting'));
 
+    this.oncanvasfocus = () => {}; // Handler for canvas focused
+
     Log.Debug("<< RFB.constructor");
 };
 
@@ -6615,6 +6673,7 @@ RFB.prototype = {
     },
 
     focus: function () {
+        this.oncanvasfocus();
         this._canvas.focus();
     },