Add backend structure with Docker support and initial configuration files

Signed-off-by: Dmitrii <computer@yawaflua.tech>

Took 4 hours 25 minutes

backend/SpMega.Backend/Program.cs

@@ -0,0 +1,93 @@
+using System.Text;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.EntityFrameworkCore;
+using MongoDB.Driver;
+using SpMega.Backend.Authetication;
+using SpMega.Backend.Persistent.Database;
+using SpMega.Backend.Services;
+
+namespace SpMega.Backend;
+
+public class Program
+{
+    public static void Main(string[] args)
+    {
+        var builder = WebApplication.CreateBuilder(args);
+        builder.Configuration
+            .AddJsonFile("appsettings.json", false)
+            .AddJsonFile("appsettings.Development.json", false)
+            .AddEnvironmentVariables();
+        
+        builder.Services.AddAuthorization();
+        builder.Services.AddLogging(logging =>
+        {
+            logging.AddConsole();
+            logging.AddDebug();
+        });
+        builder.Services
+            .AddScoped<TokenService>()
+            .AddRazorPages();
+        builder.Services
+            .AddHttpLogging(logging =>
+            {
+                logging.LoggingFields = Microsoft.AspNetCore.HttpLogging.HttpLoggingFields.All;
+            })
+            .AddRouting()
+            .AddControllers();
+        
+        
+        builder.Services.AddAuthentication(options =>
+            {
+                options.DefaultAuthenticateScheme = JwtAuthenticationSchemeOptions.DefaultScheme;
+                options.DefaultChallengeScheme = JwtAuthenticationSchemeOptions.DefaultScheme;
+            })
+            .AddScheme<JwtAuthenticationSchemeOptions, JwtAuthHandler>(
+                JwtAuthenticationSchemeOptions.DefaultScheme,
+                options => { });
+
+        builder.Services.AddAuthorizationBuilder()
+            .SetDefaultPolicy(new AuthorizationPolicyBuilder()
+                .RequireAuthenticatedUser()
+                .Build());
+        
+        var serviceCollection = new ServiceCollection();
+        var mongoClient =
+            new MongoClient(builder.Configuration.GetValue<string>("Mongo") ?? "mongodb://curiosity:27018");
+        serviceCollection.AddSingleton<IMongoClient>(mongoClient);
+        
+        builder.Services.AddDbContext<AppDbContext>((_, options) =>
+        {
+            options.UseMongoDB(mongoClient, "spmega");
+        });
+    
+        var app = builder.Build();
+
+        app.UseAuthentication();
+        app.UseAuthorization();
+        app.UseWhen(ctx => ctx.Request.Path.StartsWithSegments("/api"), appBuilder =>
+        {
+            appBuilder.UseHttpLogging();
+        });
+
+        app.MapControllers();
+        app.MapRazorPages();
+
+        app.Run();
+    }
+    
+    public static string GenerateRandomString(int length)
+    {
+        const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+        
+        var random = new Random(); 
+        var result = new StringBuilder(length);
+
+        for (var i = 0; i < length; i++)
+        {
+            var index = random.Next(chars.Length);
+            result.Append(chars[index]);
+        }
+
+        return result.ToString();
+    }
+}