Add an API

Server/Calculator.cs

@@ -1,7 +1,9 @@
 using System.Globalization;
+using System.Text.Json.Serialization;
 
 namespace GrpcCalculator.Server;
 
+[JsonConverter(typeof(JsonStringEnumConverter))]
 public enum CalculatorState
 {
     AfterEquals,
@@ -9,7 +11,7 @@ public enum CalculatorState
     AfterDigit,
 }
 
-
+[JsonConverter(typeof(JsonStringEnumConverter))]
 public enum CalculatorOperator
 {
     Addition,

Server/CalculatorEndpoints.cs

@@ -0,0 +1,15 @@
+namespace GrpcCalculator.Server;
+
+public static class CalculatorEndpoints
+{
+    public static RouteGroupBuilder MapCalculatorApi(this RouteGroupBuilder group)
+    {
+        group.MapPost("/operator/{op}", (
+            CalculatorOperator op,
+            Calculator calculator) => calculator.OperatorPressed(op));
+        group.MapPost("/equals", (Calculator calculator) => calculator.EqualsPressed());
+        group.MapPost("/digit/{digit}", (string digit, Calculator calculator) => calculator.DigitPressed(digit));
+
+        return group;
+    }
+}

Server/Program.cs

@@ -1,2 +1,22 @@
-// See https://aka.ms/new-console-template for more information
-Console.WriteLine("Hello, World!");
+using GrpcCalculator.Server;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddEndpointsApiExplorer();
+builder.Services.AddSwaggerGen();
+
+var app = builder.Build();
+
+if (app.Environment.IsDevelopment())
+{
+    app.UseSwagger();
+    app.UseSwaggerUI();
+}
+
+app.UseHttpsRedirection();
+
+app.MapGroup("/")
+    .MapCalculatorApi()
+    .WithOpenApi();
+
+app.Run();

Server/Server.csproj

@@ -1,12 +1,17 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
+    <InvariantGlobalization>true</InvariantGlobalization>
     <RootNamespace>GrpcCalculator.Server</RootNamespace>
     <AssemblyName>GrpcCalculator.Server</AssemblyName>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.1" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.5.0" />
+  </ItemGroup>
+
 </Project>