Merge branch 'master' into dev

packages/node_modules/@node-red/editor-api/lib/editor/index.js

@@ -51,7 +51,7 @@ module.exports = {
 
             var ui = require("./ui");
 
-            ui.init(runtimeAPI);
+            ui.init(settings, runtimeAPI);
 
             const editorApp = apiUtil.createExpressApp(settings)
 

packages/node_modules/@node-red/editor-api/lib/editor/ui.js

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  **/
+const crypto = require('crypto')
 var express = require('express');
 var fs = require("fs");
 var path = require("path");
@@ -24,13 +25,16 @@ var apiUtils = require("../util");
 var theme = require("./theme");
 
 var runtimeAPI;
+let settings;
 var editorClientDir = path.dirname(require.resolve("@node-red/editor-client"));
 var defaultNodeIcon = path.join(editorClientDir,"public","red","images","icons","arrow-in.svg");
 var editorTemplatePath = path.join(editorClientDir,"templates","index.mst");
 var editorTemplate;
+let cacheBuster
 
 module.exports = {
-    init: function(_runtimeAPI) {
+    init: function(_settings, _runtimeAPI) {
+        settings = _settings;
         runtimeAPI = _runtimeAPI;
         editorTemplate = fs.readFileSync(editorTemplatePath,"utf8");
         Mustache.parse(editorTemplate);
@@ -91,6 +95,12 @@ module.exports = {
     },
 
     editor: async function(req,res) {
+        if (!cacheBuster) {
+            // settings.instanceId is set asynchronously to the editor-api
+            // being initiaised. So we defer calculating the cacheBuster hash
+            // until the first load of the editor
+            cacheBuster = crypto.createHash('md5').update(`${settings.version || 'version'}-${settings.instanceId || 'instanceId'}`).digest("hex").substring(0,12)    
+        }
 
         let sessionMessages;
         if (req.session && req.session.messages) {
@@ -99,6 +109,7 @@ module.exports = {
         }
         res.send(Mustache.render(editorTemplate,{
             sessionMessages,
+            cacheBuster,
             ...await theme.context()
         }));
     },