Использование предложения должно предшествовать всем другим элементам, определенным в пространстве имен, за исключением ⇐ C#

[Anonymous]

У меня есть этот код:

Код: Выделить всё

using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
using System.Text.RegularExpressions;
using Microsoft.AspNetCore.Http.Extensions;
using Microsoft.Net.Http.Headers;
using Roblox.Libraries.EasyJwt;
using Roblox.Libraries.Password;
using Roblox.Logging;
using Roblox.Models.Sessions;
using Roblox.Services.App.FeatureFlags;
using Roblox.Website.Controllers;
using Roblox.Website.Lib;

namespace Roblox.Website.Middleware;

public class ApplicationGuardMiddleware
{
private static string authorization { get; set; }
public const string AuthorizationHeaderName = "rblx-authorization";
public const string AuthorizationCookieName = "rblx-authorization";

public static List allowedUrls { get; } = new()
{
"/auth/captcha",
"/auth/discord",
"/auth/submit",
"/auth/home",
"/auth/privacy",
"/auth/tos",
"/auth/login",
"/auth/password-reset",
"/auth/contact",
"/auth/account-deletion",
"/auth/application",
"/auth/signup",
"/auth/ticket",
"/auth/application-check",
// razor public
"/unsecuredcontent/",
// gs
"/gs/activity",
"/gs/ping",
"/gs/delete",
"/gs/shutdown",
"/gs/players/report",
"/gs/a",
// other
"/game/validate-machine",
"/game/validateticket.ashx",
"/game/get-join-script-debug",
"/api/moderation/filtertext"
};

public static void Configure(string authorizationString)
{
authorization = authorizationString;
}

public static string GetKey()
{
return authorization;
}

private RequestDelegate _next { get; set; }

public ApplicationGuardMiddleware(RequestDelegate next)
{
_next = next;
}

private bool IsAuthorized(HttpContext ctx)
{
if (ctx.Request.Headers.ContainsKey(AuthorizationHeaderName))
{
return ctx.Request.Headers[AuthorizationHeaderName].ToArray()[0] == authorization;
}

if (ctx.Request.Cookies.ContainsKey(AuthorizationCookieName))
{
// return ctx.Request.Cookies[AuthorizationCookieName]?.Contains(authorization) ?? false;
}

if (ctx.Items.ContainsKey(".ROBLOSECURITY"))
return true;

return false;
}

[MethodImpl(MethodImplOptions.AggressiveInlining|MethodImplOptions.AggressiveOptimization)]
private static bool IsOldBrowser(string ua)
{
// this is mostly to stop bots using ancient user agents, which is (strangely) incredibly common
const int minVersionChrome = 70; // todo: increase to 81
// https://www.whatismybrowser.com/guides/the-latest-user-agent/chrome
const int minVersionFirefox = 70; // todo: increase to 78
// https://www.whatismybrowser.com/guides/the-latest-user-agent/firefox
const int minVersionSafari = 602; // we actually use the WebKit version here
// https://www.whatismybrowser.com/guides/the-latest-user-agent/safari
if (ua.Contains("chrome/"))
{
for (var i = 0; i < minVersionChrome; i++)
{
if (ua.Contains("chrome/" + i + "."))
return true;
}
}
else if (ua.Contains("firefox/"))
{
for (var i = 0; i < minVersionFirefox; i++)
{
if (ua.Contains("firefox/" + i + "."))
return true;
}
}
else if (ua.Contains("safari/"))
{
for (var i = 0; i < minVersionSafari; i++)
{
if (ua.Contains("safari/"  + i + "."))
return true;
}
}

return false;
}

[SuppressMessage("ReSharper", "StringIndexOfIsCultureSpecific.1")]
[MethodImpl(MethodImplOptions.AggressiveInlining|MethodImplOptions.AggressiveOptimization)]
private bool IsUserAgentBlocked(string ua)
{
// note that this isn't really for blocking malicious actors, it's just for preventing search engines (and
// similar services) from crawling our site
ua = ua.ToLower().Trim();
if (string.IsNullOrWhiteSpace(ua)) return true;
// Google Crawlers
// please keep this up-to-date with https://developers.google.com/search/docs/advanced/crawling/overview-google-crawlers
if (ua.IndexOf("apis-google") != -1) return true;
if (ua.IndexOf("mediapartners-google") != -1) return true;
if (ua.IndexOf("adsbot-google") != -1) return true; // adsbot-google, adsbot-google-mobile, adsbot-google-Mobile-Apps
if (ua.IndexOf("googlebot") != -1) return true; // Googlebot, Googlebot-Image, Googlebot-News, Googlebot-Video
if (ua.IndexOf("feedfetcher-google") != -1) return true;
if (ua.IndexOf("google-read-aloud") != -1) return true;
if (ua.IndexOf("duplexweb-google") != -1) return true;
if (ua.IndexOf("storebot-google") != -1) return true;
if (ua.IndexOf("google-site-verification") != -1) return true; // https://www.google.com/webmasters/tools/verification/google-site-verification.html
if (ua == "google") return true; // sometimes the ua is literally just "google"? wtf
// todo: do we block "Google Favicon"?
// todo: do we block "googleweblight"?

// Bing Crawlers
// please keep this up-to-date with https://www.bing.com/webmasters/help/which-crawlers-does-bing-use-8c184ec0
if (ua.IndexOf("bingbot") != -1) return true;
if (ua.IndexOf("adidxbot") != -1) return true;
if (ua.IndexOf("bingpreview") != -1) return true;

// Yahoo Crawlers
// please keep this up-to-date with https://help.yahoo.com/kb/SLN22600.html
if (ua.IndexOf("yahoo! slurp") != -1) return true;

// Facebook (meta) Crawlers
// please keep this up-to-date with https://developers.facebook.com/docs/sharing/webmasters/crawler/
if (ua.IndexOf("facebookexternalhit") != -1) return true;

// Other crawlers
if (ua.IndexOf("qwantify") != -1) return true;
if (ua.IndexOf("duckduckgo") != -1) return true;

// Old browsers
// Even if they were legitimate users, they probably wouldn't be able to use the site due to the ssl certs being
// too new, and even if they could visit the site, it wouldn't even load properly.
if (IsOldBrowser(ua)) return true;
if (ua == "chrome") return true; // todo: what is this?
if (ua == "firefox") return true; // todo: what is this?
if (ua == "safari") return true; // todo: what is this?
if (ua == "opera") return true; // todo: what is this?

// Misc
// From https://developers.whatismybrowser.com/useragents/explore/software_type_specific/crawler/
if (ua.IndexOf("baiduspider") != -1) return true;
if (ua.IndexOf("mj12bot") != -1) return true; // https://majestic.com/
if (ua.IndexOf("megaindex") != -1) return true;
if (ua.IndexOf("ahrefsbot") != -1) return true;
if (ua.IndexOf("semrushbot") != -1) return true;
if (ua.IndexOf("dotbot") != -1) return true;
if (ua.IndexOf("jobboersebot") != -1) return true;
if (ua.IndexOf("yandexbot") != -1) return true;
if (ua.IndexOf("yandex.com") != -1) return true;
if (ua.IndexOf("developers.google.com") != -1) return true; // https://developers.whatismybrowser.com/useragents/parse/464220google-snippet-fetcher
if (ua.IndexOf("msnbot") != -1) return true; // msn is still around???
if (ua.IndexOf("seoscanners.net") != -1) return true;
if (ua.IndexOf("seokicks") != -1) return true;
if (ua.IndexOf("petalbot") != -1) return true;
if (ua.IndexOf("ia_archiver") != -1) return true;  // archive.org
if (ua.IndexOf("censys") != -1) return true;
if (ua.IndexOf("paloaltonetworks") != -1) return true;
if (ua.IndexOf("alittle client") != -1) return true;
if (ua.IndexOf("webmeup-crawler.com") != -1) return true;
if (ua.IndexOf("blexbot") != -1) return true;
if (ua.IndexOf("turnitinbot") != -1) return true; // http://www.turnitin.com/robot/crawlerinfo.html
if (ua.IndexOf("npbot") != -1) return true; // http://www.nameprotect.com/botinfo.html
if (ua.IndexOf("slysearch") != -1) return true; // http://www.slysearch.com/
if (ua.IndexOf("spaziodati.eu") != -1) return true;
if (ua.IndexOf("ezgif.com") != -1) return true;
if (ua.IndexOf("archive.org") != -1) return true;
if (ua.IndexOf("iframely") != -1) return true;
if (ua.IndexOf("googlesites") != -1) return true;
if (ua.IndexOf("comscore.com") != -1) return true; // https://www.comscore.com/Web-Crawler
if (ua.IndexOf("proximic.com") != -1) return true; // http://www.proximic.com/info/spider.php
if (ua.IndexOf("opengraph.io") != -1) return true; // https://opengraph.io/
if (ua.IndexOf("roblox.com") != -1) return true; // todo: what is this?
if (ua.IndexOf("seznambot") != -1) return true; // https://napoveda.seznam.cz/en/seznamcz-web-search/
if (ua.IndexOf("headline.com") != -1) return true; // https://www.headline.com/
if (ua.IndexOf("ev-crawler") != -1) return true; // https://www.headline.com/
if (ua.IndexOf("crawler4j") != -1) return true; // https://crawler4j.github.io/crawler4j/
if (ua.IndexOf("api.slack.com") != -1) return true; // https://api.slack.com/robots.txt
if (ua.IndexOf("slackbot") != -1) return true; // https://api.slack.com/robots.txt
if (ua.IndexOf("slack-img") != -1) return true; // https://api.slack.com/robots.txt
if (ua.IndexOf("slack-screenshot") != -1) return true; // https://api.slack.com/robots.txt
if (ua.IndexOf("slack-ss") != -1) return true; // https://api.slack.com/robots.txt
// languages (if you get blocked, do NOT uncomment these, just change your UA to something descriptive
// (e.g. "AvatarRender/1.0")
if (ua.IndexOf("python-requests") != -1) return true;
if (ua.IndexOf("go-http-client") != -1) return true;
if (ua.IndexOf("axios") != -1) return true;
if (ua.IndexOf("node-fetch") != -1) return true;
if (ua.IndexOf("node-request") != -1) return true;
if (ua.IndexOf("node-http") != -1) return true;
if (ua.IndexOf("node-https") != -1) return true;
if (ua.IndexOf("grequests") != -1) return true;
if (ua.IndexOf("http-client") != -1) return true;
if (ua.IndexOf("github.com") != -1) return true; // e.g.  "github.com/sindresorhus/got"
if (ua.IndexOf("gitlab.com") != -1) return true;
if (ua.IndexOf("bitbucket.org") != -1) return true;
if (ua.IndexOf("bitbucket.com") != -1) return true;
if (ua.IndexOf("githubusercontent.com") != -1) return true;
if (ua.IndexOf("github.io") != -1) return true;
if (ua == "ruby") return true;
if (ua.IndexOf("test certificate info") != -1) return true;
if (ua == "wp_is_mobile") return true; // no clue what this is
if (ua.IndexOf("curl/") != -1) return true;
if (ua.IndexOf("wget/") != -1) return true;
if (ua.IndexOf("well-known.dev") != -1) return true;
if (ua == "aids") return true; // ?

return false;
}

private readonly string[] allowedPathsForBlockUserAgents = new[]
{
"",
"/auth/home",
"/auth/captcha",
};

private async Task Redirect(HttpContext ctx, string dest)
{
ctx.Response.StatusCode = 302;
ctx.Response.Headers.Location = "/auth/home";
await ctx.Response.WriteAsync("Object moved to [url=\]here[/url].");
}

public async Task InvokeAsync(HttpContext ctx)
{
var appGuardTimer = new MiddlewareTimer(ctx, "AppGuard");

var normalizedPath = ctx.Request.Path.Value?.ToLower() ?? "";
if (normalizedPath.EndsWith("/"))
{
normalizedPath = normalizedPath.Substring(0, normalizedPath.Length - 1);
}

if (normalizedPath == "/robots.txt")
{
var created = DateTime.UtcNow.ToString("O");
var disallow = new List()
{
"/My/*",
"/Games/*",
"/Users/*",
"/Catalog",
"/Catalog/*",
"/Forum",
"/Forum/*",
"/Internal/*",
};
var newItems = new List();
foreach (var item in disallow)
{
newItems.Add(item.ToLower());
}
newItems.ForEach(v => disallow.Add(v));
ctx.Response.Headers.ContentType = "text/plain";
ctx.Response.Headers.CacheControl = new CacheControlHeaderValue()
{
Public = true,
MaxAge = TimeSpan.FromHours(24),
}.ToString();
await ctx.Response.WriteAsync("user-agent: *\n\n" + string.Join("\n", disallow.Select(c => "disallow: " + c)) + "\n\n#" + created);
return;
}

var uaTimer = new MiddlewareTimer(ctx, "ua");
var ua = ctx.Request.Headers["user-agent"].ToString();
var uaBlocked = IsUserAgentBlocked(ua);
var bypassOk = false;
var bypassAllowedForPath = allowedPathsForBlockUserAgents.Contains(normalizedPath);

if (uaBlocked && !bypassAllowedForPath)
{
var uaBypassWatch = new Stopwatch();
uaBypassWatch.Start();

if (ctx.Request.Cookies.TryGetValue("uabypass1", out var cookieBypass) && !string.IsNullOrWhiteSpace(cookieBypass))
{
var deleteCookie = false;
try
{
var jwtService = new EasyJwt();
var result =
jwtService.DecodeJwt(cookieBypass, Roblox.Configuration.UserAgentBypassSecret);
if (result.createdAt >  DateTime.UtcNow.Subtract(TimeSpan.FromDays(7)) &&
result.userAgent == ctx.Request.Headers.UserAgent)
{
var ipHash = ControllerBase.GetIP(ControllerBase.GetRequesterIpRaw(ctx), result.GetSalt());
if (result.ipAddress == ipHash)
{
uaBlocked = false;
bypassOk = true;
}
else
{
deleteCookie = true;
}
}
else
{
deleteCookie = true;
}

}
catch (Exception e)
{
deleteCookie = true;
Writer.Info(LogGroup.AbuseDetection, "Error while decoding UA bypass: " + e.Message);
}

if (deleteCookie)
ctx.Response.Cookies.Delete("uabypass1");
}
uaBypassWatch.Stop();
Writer.Info(LogGroup.AbuseDetection, "took {0}ms to parse ua bypass cookie", uaBypassWatch.ElapsedMilliseconds);
}
if (uaBlocked && !bypassAllowedForPath)
{
ctx.Response.StatusCode = 302;
ctx.Response.Headers.ContentType = "text/html; charset=utf-8";
ctx.Response.Headers.Location = "/auth/captcha";
await ctx.Response.WriteAsync("Please click [url=\]here[/url] to continue.");
Roblox.Metrics.ApplicationGuardMetrics.ReportBlockedUserAgent(ua);
return;
}
uaTimer.Stop();

if (!uaBlocked && !bypassOk && !bypassAllowedForPath)
Roblox.Metrics.ApplicationGuardMetrics.ReportAllowedUserAgent(ua);

var authTimer = new MiddlewareTimer(ctx, "a");
var isAuthorized = IsAuthorized(ctx);
authTimer.Stop();

if (isAuthorized || allowedUrls.Contains(normalizedPath) ||
RobloxPlayerDataRegex.IsMatch(normalizedPath))
{
appGuardTimer.Stop();
await _next(ctx);
return;
}

// If not blocked
if (FeatureFlags.IsDisabled(FeatureFlag.AllowAccessToAllRequests))
{
await Redirect(ctx, "/auth/home");
return;
}
// Otherwise, allow (almost) all
if (normalizedPath == "")
{
await Redirect(ctx, "/auth/home");
return;
}
appGuardTimer.Stop();
await _next(ctx);
}
}

public static class ApplicationGuardMiddlewareExtensions
{
public static IApplicationBuilder UseApplicationGuardMiddleware(this IApplicationBuilder builder)
{
return builder.UseMiddleware();
}
}

using System;

class RobloxPlayerDataRegex
{
public static void Main()
{
// To resolve the error in the example, the first step is to
// move the declaration of conn out of the try block. The following
// declaration is available throughout the Main method.
RobloxPlayerDataRegex conn = null;
try
{
// Inside the try block, use the conn variable that you declared
// previously.
conn = new RobloxPlayerDataRegex();
}
catch (Exception e)
{
// The following expression no longer causes an error, because
// the declaration of conn is in scope.
if (conn != null)
Console.WriteLine("{0}", e);
}
}
}

Когда я запускаю dotnet, выдает следующую ошибку:

E:\Datacenter\src\services\Roblox\Roblox .Website\Middleware\ApplicationGuardMiddleware.cs(405,1):
ошибка CS1529: предложение using должно предшествовать всем другим элементам, определенным
в пространстве имен, за исключением объявлений внешних псевдонимов
[E:\Datacenter \src\services\Roblox\Roblox.Website\Roblo
x.Website.csproj]

Сборка не удалась. Исправьте ошибки сборки и повторите запуск.
Ошибок DOTNET RUN нет

Подробнее здесь: https://stackoverflow.com/questions/748 ... ace-except