modernize ASP.NET Core samples

.vscode/launch.json

@@ -1,9 +1,15 @@
 {
-   // Use IntelliSense to find out which attributes exist for C# debugging
-   // Use hover for the description of the existing attributes
-   // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
-   "version": "0.2.0",
-   "configurations": [
+    // Use IntelliSense to find out which attributes exist for C# debugging
+    // Use hover for the description of the existing attributes
+    // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "ASP.NET Core Sample Launch",
+            "type": "dotnet",
+            "request": "launch",
+            "projectPath": "${workspaceFolder}/samples/CloudNative.CloudEvents.AspNetCoreSample/CloudNative.CloudEvents.AspNetCoreSample.csproj"
+        },
         {
             "name": ".NET Core Launch (console)",
             "type": "coreclr",
@@ -24,5 +30,5 @@
             "request": "attach",
             "processId": "${command:pickProcess}"
         }
-    ,]
+    ]
 }

samples/CloudNative.CloudEvents.AspNetCoreSample/CloudEventBinding.cs

@@ -0,0 +1,56 @@
+// Copyright (c) Cloud Native Foundation.
+// Licensed under the Apache 2.0 license.
+// See LICENSE file in the project root for full license information.
+
+using CloudNative.CloudEvents.AspNetCore;
+using CloudNative.CloudEvents.Core;
+using CloudNative.CloudEvents.SystemTextJson;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.HttpResults;
+using Microsoft.Extensions.DependencyInjection;
+using System.Reflection;
+using System.Threading.Tasks;
+
+namespace CloudNative.CloudEvents.AspNetCoreSample;
+
+public class CloudEventBinding : IBindableFromHttpContext<CloudEventBinding>
+{
+    public CloudEvent Value { get; init; }
+
+    public ProblemHttpResult Error { get; init; }
+
+    public static async ValueTask<CloudEventBinding> BindAsync(HttpContext context, ParameterInfo parameter)
+    {
+        Validation.CheckNotNull(context, nameof(context));
+        Validation.CheckNotNull(parameter, nameof(parameter));
+
+        var request = context.Request;
+
+        // Even though we're not allowing non-JSON content in this binding,
+        // types such as "text/xml" could still be parsed with the current JsonEventFormatter,
+        // but it's just not making it strongly typed, or anything structured (XmlNode).
+        // Depending on your use-case, it may or may not be desirable to allow that.
+        if (request.ContentLength != 0 && !request.HasJsonContentType())
+        {
+            return new CloudEventBinding
+            {
+                Error = TypedResults.Problem(
+                    statusCode: StatusCodes.Status415UnsupportedMediaType,
+                    title: "Unsupported media type",
+                    detail: "Request content type is not JSON and not fully supported in this binding. " +
+                    "Please note: the CloudEvents specification does allow for any data content, " +
+                    "as long as it adheres to the provided datacontenttype."
+                )
+            };
+        }
+
+        var formatter = context.RequestServices.GetRequiredService<JsonEventFormatter>();
+
+        var cloudEvent = await request.ToCloudEventAsync(formatter);
+
+        return new CloudEventBinding
+        {
+            Value = cloudEvent
+        };
+    }
+}

samples/CloudNative.CloudEvents.AspNetCoreSample/CloudEventOperations.cs

@@ -0,0 +1,60 @@
+// Copyright (c) Cloud Native Foundation.
+// Licensed under the Apache 2.0 license.
+// See LICENSE file in the project root for full license information.
+
+using CloudNative.CloudEvents.AspNetCore;
+using CloudNative.CloudEvents.SystemTextJson;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.HttpResults;
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace CloudNative.CloudEvents.AspNetCoreSample;
+
+public static class CloudEventOperations
+{
+    public static async Task<Results<ProblemHttpResult, JsonHttpResult<object>>> ReceiveCloudEvent(CloudEventBinding cloudEventBinding)
+    {
+        if (cloudEventBinding.Error is not null)
+        {
+            return cloudEventBinding.Error;
+        }
+
+        var cloudEvent = cloudEventBinding.Value;
+
+        var cloudEventAttributes = cloudEvent.GetPopulatedAttributes()
+            .ToDictionary(pair => pair.Key.Name, pair => pair.Key.Format(pair.Value));
+
+        return TypedResults.Json<object>(new
+        {
+            note = "wow, such event, much disassembling, very skill",
+            cloudEvent.SpecVersion.VersionId,
+            cloudEventAttributes,
+            cloudEvent.Data
+        });
+    }
+
+    /// <summary>
+    /// Generates a CloudEvent.
+    /// </summary>
+    public static async Task GenerateCloudEvent(HttpResponse response, JsonEventFormatter formatter, ContentMode contentMode = ContentMode.Structured)
+    {
+        var evt = new CloudEvent
+        {
+            Type = "CloudNative.CloudEvents.AspNetCoreSample",
+            Source = new Uri("https://github.com/cloudevents/sdk-csharp"),
+            Time = DateTimeOffset.Now,
+            DataContentType = "application/json",
+            Id = Guid.NewGuid().ToString(),
+            Data = new
+            {
+                Language = "C#",
+                EnvironmentVersion = Environment.Version.ToString()
+            }
+        };
+
+        response.StatusCode = StatusCodes.Status200OK;
+        await evt.CopyToHttpResponseAsync(response, contentMode, formatter);
+    }
+}

samples/CloudNative.CloudEvents.AspNetCoreSample/CloudNative.CloudEvents.AspNetCoreSample.csproj

@@ -7,7 +7,7 @@
   <ItemGroup>
     <ProjectReference Include="..\..\src\CloudNative.CloudEvents.AspNetCore\CloudNative.CloudEvents.AspNetCore.csproj" />
     <ProjectReference Include="..\..\src\CloudNative.CloudEvents\CloudNative.CloudEvents.csproj" />
-    <ProjectReference Include="..\..\src\CloudNative.CloudEvents.NewtonsoftJson\CloudNative.CloudEvents.NewtonsoftJson.csproj" />
+    <ProjectReference Include="..\..\src\CloudNative.CloudEvents.SystemTextJson\CloudNative.CloudEvents.SystemTextJson.csproj" />
   </ItemGroup>
 
 </Project>

samples/CloudNative.CloudEvents.AspNetCoreSample/CloudNative.CloudEvents.AspNetCoreSample.http

@@ -1,16 +1,56 @@
 @HostAddress = https://localhost:5001
 
+### Send via Structured mode
+
+POST {{HostAddress}}/api/events/receive
+Content-Type: application/cloudevents+json; charset=utf-8
+
+{
+  "specversion": "1.0",
+  "type":  "com.example.myevent",
+  "source": "urn:example-com:mysource:abc",
+  "id": "{{$guid}}",
+  "data": {
+    "message": "Hello world!"
+  }
+}
+
+### Send via Binary mode
+
 POST {{HostAddress}}/api/events/receive
 Content-Type: application/json
 CE-SpecVersion: 1.0
 CE-Type: "com.example.myevent"
 CE-Source: "urn:example-com:mysource:abc"
-CE-Id: "c457b7c5-c038-4be9-98b9-938cb64a4fbf"
+CE-Id: "{{$guid}}"
 
 {
     "message": "Hello world!"
 }
 
-###
+### Send content-less via Binary mode
+
+POST {{HostAddress}}/api/events/receive
+CE-SpecVersion: 1.0
+CE-Type: "com.example.myevent"
+CE-Source: "urn:example-com:mysource:abc"
+CE-Id: "{{$guid}}"
+
+### Send unsupported media type (XML) via Binary mode
+
+POST {{HostAddress}}/api/events/receive
+Content-Type: text/xml
+CE-SpecVersion: 1.0
+CE-Type: "com.example.myevent"
+CE-Source: "urn:example-com:mysource:abc"
+CE-Id: "{{$guid}}"
+
+<message>Hello world!</message>
+
+### Generate via Structured mode
 
 GET {{HostAddress}}/api/events/generate
+
+### Generate via Binary mode
+
+GET {{HostAddress}}/api/events/generate?contentMode=Binary

samples/CloudNative.CloudEvents.AspNetCoreSample/Program.cs

@@ -3,18 +3,21 @@
 // See LICENSE file in the project root for full license information.
 
 using CloudNative.CloudEvents.AspNetCoreSample;
+using CloudNative.CloudEvents.SystemTextJson;
 using Microsoft.AspNetCore.Builder;
-using CloudNative.CloudEvents.NewtonsoftJson;
 using Microsoft.Extensions.DependencyInjection;
+using System.Text.Json;
 
 var builder = WebApplication.CreateBuilder(args);
 
-builder.Services.AddControllers(opts =>
-    opts.InputFormatters.Insert(0, new CloudEventJsonInputFormatter(new JsonEventFormatter())));
+JsonSerializerOptions jsonOptions = new() { PropertyNamingPolicy = JsonNamingPolicy.CamelCase };
+builder.Services.AddSingleton(new JsonEventFormatter(jsonOptions, new JsonDocumentOptions()));
 
 var app = builder.Build();
 
-app.MapControllers();
+var apiEvents = app.MapGroup("/api/events");
+apiEvents.MapPost("/receive", CloudEventOperations.ReceiveCloudEvent);
+apiEvents.MapGet("/generate", CloudEventOperations.GenerateCloudEvent);
 
 app.Run();
 

samples/HttpSend/HttpSend.csproj

@@ -8,7 +8,7 @@
   <ItemGroup>
     <PackageReference Include="McMaster.Extensions.CommandLineUtils" />
     <ProjectReference Include="..\..\src\CloudNative.CloudEvents\CloudNative.CloudEvents.csproj" />
-    <ProjectReference Include="..\..\src\CloudNative.CloudEvents.NewtonsoftJson\CloudNative.CloudEvents.NewtonsoftJson.csproj" />
+    <ProjectReference Include="..\..\src\CloudNative.CloudEvents.SystemTextJson\CloudNative.CloudEvents.SystemTextJson.csproj" />
   </ItemGroup>
 
 </Project>