Resolve "Authentication middleware"

Api/Middleware/AuthenticationMiddleware.cs

+namespace Api.Middleware;
+
+public class AuthenticationMiddleware
+{
+    private readonly string _token = "token";
+    private readonly RequestDelegate _next;
+    
+    public AuthenticationMiddleware(RequestDelegate next)
+    {
+        _next = next;
+    }
+
+    public async Task Invoke(HttpContext context)
+    {
+        if (context.Request.Headers["Authorization"] != _token)
+        {
+            context.Response.StatusCode = 401;
+            return;
+        }
+
+        await _next(context);
+    }
+
+}
\ No newline at end of file

Api/Program.cs

 using Api.Middleware;
 using DAL.Data;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.OpenApi.Models;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -22,7 +23,35 @@ builder.Services.AddControllers();
 
 // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
 builder.Services.AddEndpointsApiExplorer();
-builder.Services.AddSwaggerGen();
+builder.Services.AddSwaggerGen(c =>
+{
+    c.SwaggerDoc("v1", new OpenApiInfo { Title = "Your API", Version = "v1" });
+
+    // Configure Swagger to accept a static token
+    c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
+    {
+        Description = "Enter the API key as follows: Bearer YourHardcodedToken",
+        Name = "Authorization",
+        In = ParameterLocation.Header,
+        Type = SecuritySchemeType.ApiKey,
+        Scheme = "Bearer"
+    });
+
+    c.AddSecurityRequirement(new OpenApiSecurityRequirement
+    {
+        {
+            new OpenApiSecurityScheme
+            {
+                Reference = new OpenApiReference
+                {
+                    Type = ReferenceType.SecurityScheme,
+                    Id = "Bearer"
+                }
+            },
+            new string[] {}
+        }
+    });
+});
 builder.Services.AddExceptionHandler<ExceptionHandlerMiddleware>();
 
 var app = builder.Build();
@@ -43,6 +72,8 @@ app.UseHttpsRedirection();
 
 app.UseAuthorization();
 
+app.UseMiddleware<AuthenticationMiddleware>();
+
 app.MapControllers();
 
 app.Run();