SocialPub/PrivaPub/Program.cs

using Microsoft.AspNetCore.HttpOverrides;
using Microsoft.Extensions.Options;

using MongoDB.Bson;
using MongoDB.Bson.Serialization;
using MongoDB.Bson.Serialization.Serializers;
using MongoDB.Driver;
using MongoDB.Entities;

using Serilog;

using PrivaPub.Data;
using PrivaPub.Extensions;
using PrivaPub.Api.Mastodon.Auth;
using PrivaPub.Api.Mastodon.Infrastructure;
using PrivaPub.Infrastructure;
using PrivaPub.Infrastructure.Cli;
using PrivaPub.Infrastructure.Data;
using PrivaPub.Infrastructure.Http;
using PrivaPub.Infrastructure.Statistics;
using PrivaPub.Middleware;
using PrivaPub.Models;
using PrivaPub.Services;
using PrivaPub.StaticServices;

Log.Logger = new LoggerConfiguration().WriteTo.Console().CreateBootstrapLogger();

try
{
	var builder = WebApplication.CreateBuilder(args);
	builder.WebHost.ConfigureKestrel(serverOptions =>
	{
		if (builder.Environment.IsProduction())
		{
			serverOptions.ListenLocalhost(6970);
			serverOptions.UseSystemd();
			serverOptions.AddServerHeader = false;
		}
	});
	builder.Host.UseSerilog((context, config) =>
	{
		config.ReadFrom.Configuration(context.Configuration);
	});

	try
	{
		builder.Services.PrivaPubAppSettingsConfiguration(builder.Configuration)
			.PrivaPubAuthServicesConfiguration(builder.Configuration)
			.PrivaPubInternalizationConfiguration(builder.Configuration)
			.PrivaPubOptimizationConfiguration()
			.PrivaPubDataBaseConfiguration()
			.PrivaPubServicesConfiguration()
			.PrivaPubFederationConfiguration(builder.Configuration)
			.PrivaPubStatisticsConfiguration(builder.Configuration)
			.PrivaPubCORSConfiguration()
			.PrivaPubRateLimiting(builder.Configuration)
			.PrivaPubOAuth(builder.Environment)
			.AddScoped<PrivaPub.Api.Mastodon.Mappers.MastodonMapper>()
			.AddScoped<PrivaPub.Api.Mastodon.Mappers.AccountSearch>()
			.AddSingleton<PrivaPub.Domain.Social.Trends>()
			.Configure<PrivaPub.Domain.Media.MediaOptions>(builder.Configuration.GetSection("Media"))
			// the server's own settings (R5): read at start, saved from the administrator's page, read again every five
			// minutes; the media limits it changes reach every IOptionsMonitor<MediaOptions> reader
			.AddSingleton<PrivaPub.Domain.Instance.IInstanceSettings, PrivaPub.Domain.Instance.InstanceSettings>()
			.AddHostedService<PrivaPub.Domain.Instance.InstanceSettingsRefresher>()
			.AddSingleton<IPostConfigureOptions<PrivaPub.Domain.Media.MediaOptions>, PrivaPub.Domain.Instance.MediaLimitsFromSettings>()
			.AddSingleton<IOptionsChangeTokenSource<PrivaPub.Domain.Media.MediaOptions>, PrivaPub.Domain.Instance.MediaLimitsChangeSource>()
			.AddSingleton<PrivaPub.Domain.Moderation.IModerationLog, PrivaPub.Domain.Moderation.ModerationLog>()
			.AddSingleton<PrivaPub.Domain.Social.IAnnouncements, PrivaPub.Domain.Social.Announcements>()
			.AddSingleton<PrivaPub.Domain.Media.IMediaService, PrivaPub.Domain.Media.MediaService>()
			.AddSingleton<PrivaPub.Domain.Media.IMediaProxy, PrivaPub.Domain.Media.MediaProxy>()
			.AddHostedService<PrivaPub.Domain.Media.MediaJanitor>()
			.Configure<PrivaPub.Infrastructure.Backup.BackupOptions>(builder.Configuration.GetSection("Backups"))
			.AddSingleton<PrivaPub.Infrastructure.Backup.Backups>()
			.AddSingleton<PrivaPub.Infrastructure.Backup.TransferStore>()
			.AddHostedService<PrivaPub.Infrastructure.Backup.BackupScheduler>()
			.AddHostedService<PrivaPub.Infrastructure.Backup.RestoreWatcher>()
			.PrivaPubMiddlewareConfiguration();
	}
	catch (Exception ex)
	{
		Log.ForContext<Program>().Fatal(ex, "{0}.{1}()", nameof(Program), "ConfigureServices");
		throw;
	}

	var federationOptions = builder.Configuration.GetSection("Federation").Get<FederationOptions>() ?? new();
	if (builder.Environment.IsProduction() && (federationOptions.AllowPrivateNetworks || federationOptions.AllowPlainHttp || federationOptions.AcceptAnyCertificate))
		throw new InvalidOperationException("Federation:AllowPrivateNetworks, AllowPlainHttp and AcceptAnyCertificate are for test networks and must stay off in Production.");

	try
	{
		BsonSerializer.TryRegisterSerializer(new GuidSerializer(GuidRepresentation.Standard));
		var mongoSettings = builder.Configuration.GetSection(nameof(MongoSettings)).Get<MongoSettings>();
		await DB.InitAsync(mongoSettings.Database, MongoClientSettings.FromConnectionString(mongoSettings.ConnectionString));
		EntityMaps.Warm();
	}
	catch (Exception ex)
	{
		Log.ForContext<Program>().Fatal(ex, $"{nameof(Program)}.{nameof(Program)}() DB Instantiation");
		throw;
	}

	var app = default(WebApplication);
	try
	{
		app = builder.Build();
	}
	catch (Exception ex)
	{
		Log.ForContext<Program>().Fatal(ex, "{0}.{1}()", nameof(Program), "Build");
		throw;
	}

	// A restore asked for runs here, before migrations, indexes and every hosted service; a command waits for it.
	var gate = await PrivaPub.Infrastructure.Backup.MaintenanceGate.Enter(app.Services, args is ["admin", .. var asked] ? asked : default, CancellationToken.None);
	if (gate is { } stop)
	{
		Environment.ExitCode = stop;
		return;
	}

	// Commands get every service but start nothing: no Kestrel, no hosted services, no media directory. The deploy runs
	// them as its own user, which can read the configuration and reach the private mongod but owns no www-data directory.
	// Backups and restores are asked for before migrations: the deploy's backup is of the database as the live build left it.
	if (args is ["admin", .. var command] && AdminCommands.BeforeMigrations(command))
	{
		using var scope = app.Services.CreateScope();
		Environment.ExitCode = await AdminCommands.Run(command, scope.ServiceProvider);
		return;
	}

	try
	{
		await DB.Default.MigrateAsync<Program>();
		await Indexes.Create();
		await app.Services.GetRequiredService<PrivaPub.Domain.Instance.IInstanceSettings>().Reload(CancellationToken.None);
	}
	catch (Exception ex)
	{
		Log.ForContext<Program>().Fatal(ex, $"{nameof(Program)}.{nameof(Program)}() DB Migrations");
		throw;
	}

	if (args is ["admin", ..])
	{
		using var scope = app.Services.CreateScope();
		Environment.ExitCode = await AdminCommands.Run(args[1..], scope.ServiceProvider);
		return;
	}

	try
	{
		var localizationService = app.Services.GetService<RequestLocalizationOptionsService>();
		if (app.Environment.IsProduction())
		{
			app.UseResponseCompression();
			app.UseForwardedHeaders(new()
			{
				ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto
			});
		}

		if (app.Environment.IsDevelopment())
		{
			app.UseSwagger();
			app.UseSwaggerUI();
		}

		app.UseHttpsRedirection();
		app.UseCors("DefaultCORS");
		app.UseMastodonErrorBodies();

		app.UseStaticFiles();
		var mediaRoot = app.Services.GetRequiredService<PrivaPub.Domain.Media.IMediaService>().Root;
		Directory.CreateDirectory(mediaRoot);
		app.UseStaticFiles(new StaticFileOptions
		{
			FileProvider = new Microsoft.Extensions.FileProviders.PhysicalFileProvider(mediaRoot),
			RequestPath = "/media/files",
			ContentTypeProvider = PrivaPub.Domain.Media.MediaService.ContentTypes,
			OnPrepareResponse = context =>
			{
				context.Context.Response.Headers["X-Content-Type-Options"] = "nosniff";
				context.Context.Response.Headers["Content-Security-Policy"] = "default-src 'none'; sandbox";
				context.Context.Response.Headers["Cache-Control"] = "public, max-age=31536000, immutable";
			}
		});

		app.UseRequestLocalization(await localizationService.Get());

		app.UseWebSockets(new WebSocketOptions { KeepAliveInterval = TimeSpan.FromSeconds(30) });
		app.UseRouting();
		app.UseTrafficMeter();
		app.UseRateLimiter();

		// a stream's token may come as access_token or as the WebSocket's protocol, as Mastodon's clients send it
		app.Use(async (context, next) =>
		{
			if (context.Request.Path.StartsWithSegments("/api/v1/streaming") && !context.Request.Headers.ContainsKey("Authorization"))
			{
				var token = context.Request.Query["access_token"].ToString();
				if (string.IsNullOrEmpty(token))
					token = context.Request.Headers["Sec-WebSocket-Protocol"].ToString();
				if (!string.IsNullOrEmpty(token))
					context.Request.Headers.Authorization = "Bearer " + token;
			}
			await next();
		});

		app.UseAuthentication();
		app.UseAuthorization();

		app.MapGet("/build.json", () => Results.Json(new
		{
			commit = BuildInfo.Commit,
			buildRef = BuildInfo.Ref,
			builtAt = BuildInfo.BuiltAt,
		}));
		app.MapControllers();
		app.MapRazorPages();
	}
	catch (Exception ex)
	{
		Log.ForContext<Program>().Fatal(ex, "{0}.{1}()", nameof(Program), "Use");
		throw;
	}

	Log.ForContext<Program>().Information($"Starting PrivaPub at {nameof(Program)}()");
	try
	{
		var dbClient = app.Services.GetService(typeof(DbEntities)) as DbEntities;
		await dbClient.Init();
		await app.Services.GetRequiredService<PrivaPub.Federation.Moderation.IDomainBlocks>().Reload(CancellationToken.None);
		await PrivaPub.Api.Mastodon.Auth.PersonaExchange.EnsureFirstPartyClient(app.Services, CancellationToken.None);
	}
	catch (Exception ex)
	{
		Log.ForContext<Program>().Warning(ex, $"{nameof(Program)}.{nameof(Program)}() DB Init");
	}

	await app.RunAsync();
}
catch (Exception ex)
{
	Log.ForContext<Program>().Fatal(ex, $"{nameof(Program)}.{nameof(Program)}()");
	Environment.ExitCode = 1;
}
finally
{
	await Log.CloseAndFlushAsync();
}