indirection for local storage from backend

src/NetCore2Blockly/NetCore2Blockly/ExtensionMethods/CLIExtension.cs

@@ -2,6 +2,7 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.FileProviders;
+using Microsoft.Extensions.FileProviders.Physical;
 using System;
 using System.IO;
 using System.IO.Pipelines;
@@ -116,22 +117,52 @@ public static void UseBlocklyUI(this IApplicationBuilder appBuilder)
 new ManifestEmbeddedFileProvider(Assembly.GetExecutingAssembly());
 
             mapFile("blocklyFiles", manifestEmbeddedProvider, appBuilder);
-            mapStorage(appBuilder)
+            //use local storage default
+            mapStorage(appBuilder);
+        }
+        /// <summary>
+        /// Uses the storage
+        /// </summary>
+        /// <param name="appBuilder">The application builder.</param>
+        public static void UseStorage(this IApplicationBuilder appBuilder)
+        {
+            mapStorage(appBuilder);
         }
-
         private static void mapStorage(IApplicationBuilder appBuilder)
         {
             var localStorage = "";
             localStorage += "function BlocklySetItem(key,value)=>window.localStorage.setItem(key,value);";
             localStorage += "function GetData_key_getItem()=>window.localStorage;";
             localStorage += "function GetAllData()=>window.localStorage;";
 
+            var manifestEmbeddedProvider =
+                new ManifestEmbeddedFileProvider(Assembly.GetExecutingAssembly());
 
             appBuilder.Map("/blocklyStorage", app =>
-             {
-                 app.Run(async context =>
+            {
+                 app.Run(async cnt=>
                  {
-                     await Task.Delay(100);
+                     string nameFile = "extensions/SaveToLocalStorage.js";
+                     IFileInfo f = new PhysicalFileInfo(new FileInfo("wwwroot/"+nameFile));
+          
+                     if (!f.Exists)
+                     {
+
+                         f = manifestEmbeddedProvider.GetFileInfo("blocklyFiles/"+nameFile);
+                     }
+                     //TODO: add corect mime type for js files
+                     using var stream = new MemoryStream();
+                     using var cs = f.CreateReadStream();
+                     byte[] buffer = new byte[2048]; // read in chunks of 2KB
+                     int bytesRead;
+                     while ((bytesRead = cs.Read(buffer, 0, buffer.Length)) > 0)
+                     {
+                         stream.Write(buffer, 0, bytesRead);
+                     }
+                     byte[] result = stream.ToArray();
+                     // TODO: do something with the result
+                     var m = new Memory<byte>(result);
+                     await cnt.Response.BodyWriter.WriteAsync(m);
                  });
              });
 

src/NetCore2Blockly/TestBlocklyHtml/Startup.cs

@@ -76,7 +76,7 @@ public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
             //TODO: put this in the real application
             // or copy the blockly.html files and others from wwwroot
             //app.UseBlocklyUI();
-
+            app.UseStorage();//this is necessary , even for local storage
             //this is not necessary to be added
             app.UseSwagger();
 

src/NetCore2Blockly/TestBlocklyHtml/wwwroot/blockly.html

@@ -13,15 +13,15 @@
     <script src="/blockly/javascript_compressed.js"></script>
     <script src="/blockly/en.js"></script>
     <script src="/blockly/wait_block.js"></script>
-    <script src="blockly/ifxhr.js"></script>
-    <script src="blockly/blocklyControls.js"></script>
-    <script src="others/jszip.min.js"></script>
-    <script src="others/FileSaver.min.js"></script>
-    <script src="blockly/BlocklyXHRWrapper.js"></script>
-    <script src="blockly/convertCSV.js"></script>
-    <script src="blockly/exportFile.js"></script>
-    <script src="blockly/blocklyXHR.js"></script>
-    <script src="extensions/SaveToLocalStorage.js"></script>
+    <script src="/blockly/ifxhr.js"></script>
+    <script src="/blockly/blocklyControls.js"></script>
+    <script src="/others/jszip.min.js"></script>
+    <script src="/others/FileSaver.min.js"></script>
+    <script src="/blockly/BlocklyXHRWrapper.js"></script>
+    <script src="/blockly/convertCSV.js"></script>
+    <script src="/blockly/exportFile.js"></script>
+    <script src="/blockly/blocklyXHR.js"></script>
+    <script src="/blocklyStorage"></script>
     <!--doNotCopyToFinal-->
     <script src="doNotCopy/testing.js"></script>
     <script src="doNotCopy/JRTemplating.js"></script>