GEODE-9464: Add Asp.Net Core session state sample application (#856)

* Add AspNetCore GeodeSession Sample
* Create region for sessionState in startserver
* Add Apache license header

netcore/AspNetCore GeodeSession Sample/AspNetCore GeodeSession Sample.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <Platforms>x64</Platforms>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\NetCore.Session\NetCore.Session.csproj" />
+  </ItemGroup>
+
+
+</Project>

netcore/AspNetCore GeodeSession Sample/AspNetCore GeodeSession Sample.csproj.user

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <ActiveDebugProfile>IIS Express</ActiveDebugProfile>
+  </PropertyGroup>
+</Project>

netcore/AspNetCore GeodeSession Sample/Extensions/SessionExtensions.cs

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+using System.Text.Json;
+using Microsoft.AspNetCore.Http;
+
+namespace Web.Extensions {
+#region snippet1
+  public static class SessionExtensions {
+    public static void Set<T>(this ISession session, string key, T value) {
+      session.SetString(key, JsonSerializer.Serialize(value));
+    }
+
+    public static T Get<T>(this ISession session, string key) {
+      var value = session.GetString(key);
+      return value == null ? default : JsonSerializer.Deserialize<T>(value);
+    }
+  }
+#endregion
+}
+
+namespace Web.Extensions2 {
+  // Alternate approach
+
+  public static class SessionExtensions {
+    public static void Set<T>(this ISession session, string key, T value) {
+      session.SetString(key, JsonSerializer.Serialize(value));
+    }
+
+    public static bool TryGet<T>(this ISession session, string key, out T value) {
+      var state = session.GetString(key);
+      value = default;
+      if (state == null) {
+        return false;
+      }
+      value = JsonSerializer.Deserialize<T>(state);
+      return true;
+    }
+  }
+}

netcore/AspNetCore GeodeSession Sample/Middleware/HttpContextItemsMiddleware.cs

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+using System;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+
+namespace SessionSample.Middleware {
+#region snippet1
+  public class HttpContextItemsMiddleware {
+    private readonly RequestDelegate _next;
+    public static readonly object HttpContextItemsMiddlewareKey = new Object();
+
+    public HttpContextItemsMiddleware(RequestDelegate next) {
+      _next = next;
+    }
+
+    public async Task Invoke(HttpContext httpContext) {
+      httpContext.Items[HttpContextItemsMiddlewareKey] = "K-9";
+
+      await _next(httpContext);
+    }
+  }
+
+  public static class HttpContextItemsMiddlewareExtensions {
+    public static IApplicationBuilder UseHttpContextItemsMiddleware(this IApplicationBuilder app) {
+      return app.UseMiddleware<HttpContextItemsMiddleware>();
+    }
+  }
+#endregion
+}

netcore/AspNetCore GeodeSession Sample/Models/BasicAuthInitialize.cs

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+using Apache.Geode.Client;
+using System;
+using System.Collections.Generic;
+
+namespace GemFireSessionState.Models
+{
+  public class BasicAuthInitialize : IAuthInitialize
+  {
+    private string _username;
+    private string _password;
+
+    public BasicAuthInitialize(string username, string password)
+    {
+      _username = username;
+      _password = password;
+    }
+
+    public void Close()
+    {
+    }
+
+    public Dictionary<string, string> GetCredentials()
+    {
+      Console.WriteLine("SimpleAuthInitialize::GetCredentials called");
+      var credentials = new Dictionary<string, string>();
+      credentials.Add("security-username", "root");
+      credentials.Add("security-password", "root-password");
+      return credentials;
+    }
+  }
+}

netcore/AspNetCore GeodeSession Sample/Models/ErrorViewModel.cs

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace SessionSample.Models
+{
+  public class ErrorViewModel
+  {
+  }
+}

netcore/AspNetCore GeodeSession Sample/Pages/Error.cshtml

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+@*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *@
+@page
+@model ErrorModel
+@{
+  ViewData["Title"] = "Error";
+}
+
+<h1 class="text-danger">Error.</h1>
+<h2 class="text-danger">An error occurred while processing your request.</h2>
+
+@if (Model.ShowRequestId)
+{
+  <p>
+    <strong>Request ID:</strong> <code>@Model.RequestId</code>
+  </p>
+}
+
+<h3>Development Mode</h3>
+<p>
+  Swapping to the <strong>Development</strong> environment displays detailed information about the error that occurred.
+</p>
+<p>
+  <strong>The Development environment shouldn't be enabled for deployed applications.</strong>
+  It can result in displaying sensitive information from exceptions to end users.
+  For local debugging, enable the <strong>Development</strong> environment by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>
+  and restarting the app.
+</p>

netcore/AspNetCore GeodeSession Sample/Pages/Error.cshtml.cs

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace SessionSample.Pages {
+  [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+  public class ErrorModel : PageModel {
+    public string RequestId { get; set; }
+
+    public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+
+    public void OnGet() {
+      RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier;
+    }
+  }
+}

netcore/AspNetCore GeodeSession Sample/Pages/Index.cshtml

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+@*
+  * Licensed to the Apache Software Foundation (ASF) under one or more
+  * contributor license agreements.  See the NOTICE file distributed with
+  * this work for additional information regarding copyright ownership.
+  * The ASF licenses this file to You under the Apache License, Version 2.0
+  * (the "License"); you may not use this file except in compliance with
+  * the License.  You may obtain a copy of the License at
+  *
+  *      http://www.apache.org/licenses/LICENSE-2.0
+  *
+  * Unless required by applicable law or agreed to in writing, software
+  * distributed under the License is distributed on an "AS IS" BASIS,
+  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  * See the License for the specific language governing permissions and
+  * limitations under the License.
+*@
+@page
+@using Microsoft.AspNetCore.Http
+@model IndexModel
+@{
+  ViewData["Title"] = "Asp.Net Core Session Sample";
+}
+
+<h1>@ViewData["Title"]</h1>
+
+<h2>State management</h2>
+
+<div class="row">
+  <div class="col-md-8">
+    <form method="post">
+      <div class="panel panel-default">
+        <div class="panel-heading">
+          <button type="submit" asp-page-handler="ChangeAge" class="pull-right btn btn-danger">Change Age</button>
+          <h3 class="panel-title" style="line-height:2.1">Name and Age</h3>
+        </div>
+        <div class="panel-body">
+          <p>
+            The name and age are stored in session. Select the <span style="font-weight:bold">Change Age</span>
+            button to update the session to a new random age value.
+          </p>
+          <p>
+            Session values by the model with
+            <code>@@Model.&lt;PropertyName&gt;</code>:
+          </p>
+          <p><b>Name:</b> @Model.SessionInfo_Name <b>Age:</b> @Model.SessionInfo_Age</p>
+          <hr>
+          <p>Session values direct </p>
+          <p>
+            <b>Name:</b> @HttpContext.Session.GetString(IndexModel.SessionKeyName)
+            <b>Age:</b>
+            @HttpContext.Session.GetInt32(IndexModel.SessionKeyAge).ToString()
+          </p>
+        </div>
+      </div>
+    </form>
+  </div>
+</div>
+
+<div class="row">
+  <div class="col-md-8">
+    <div class="panel panel-default">
+      <div class="panel-heading">
+        <h3 class="panel-title">HttpContext.Items Middleware Value</h3>
+      </div>
+      <div class="panel-body">
+        <p>
+          The middleware value is set into the <code>HttpContext.Items</code> collection by
+          the <code>HttpContextItemsMiddleware</code> before Razor Pages processes the request.
+          The value is retreived by the page and displayed.
+        </p>
+        <p>Value: @Model.SessionInfo_MiddlewareValue</p>
+      </div>
+    </div>
+  </div>
+</div>
+
+<div class="row">
+  <div class="col-md-8">
+    <form method="post">
+      <div class="panel panel-default">
+        <div class="panel-heading clearfix">
+          <button type="submit" asp-page-handler="UpdateSessionDate" class="pull-right btn btn-danger">Update Session Time</button>
+          <a href="/" class="pull-right btn btn-danger" style="margin-right:5px">Reload Page (No Update)</a>
+          <h3 class="panel-title" style="line-height:2.1">Session Time</h3>
+        </div>
+        <div class="panel-body">
+          <p>
+            The session time is stored in session. Select the <span style="font-weight:bold">
+              Reload Page (No Update)
+            </span> button to display the current time and the time stored in session.
+            Select the <span style="font-weight:bold">Update Session Time</span> button to store the current time in session.
+          </p>
+          <p>Current Time: @Model.SessionInfo_CurrentTime</p>
+          <p>Session Time: @Model.SessionInfo_SessionTime</p>
+        </div>
+      </div>
+    </form>
+  </div>
+</div>