Clever Geek Handbook

基于C＃.Net框架的高级自行车构建或客户端/服务器应用程序

介绍



这一切始于一位同事建议我创建一个小型Web服务。它本来应该是种麻烦，但对于IT人群而言。功能非常简单，您进行注册，填写个人资料并转到要点，即找到对话者并扩展您的联系并结识新朋友。

在这里，我必须离题并简单介绍一下自己，以便将来更清楚地说明我为何在开发中采取这样的步骤。



目前，我在游戏工作室中担任技术美术师一职，我在C＃编程中的经验仅基于为Unity编写脚本和实用程序，此外，还创建了用于Android设备低级工作的插件。我还没有走出这个小世界，然后出现了这样的机会。

第1部分。框架原型



确定了该服务的方式后，我开始寻找实现的选项。最简单的方法是找到某种现成的解决方案，就像地球仪上的猫头鹰一样，可以由我们的技术人员来拉动，并将其全部公开谴责。

但这并不有趣，我没有看到任何挑战和感觉，因此我开始研究网络技术以及与之互动的方法。



我从查看C＃.Net文章和文档开始。在这里，我发现了完成任务的多种方法。从成熟的解决方案（如ASP.Net或Azure服务）到直接与Tcp \ Http连接的交互，有许多与网络交互的机制。



第一次尝试使用ASP后，我立即撤消了它，我认为对于我们的服务而言，做出决定太困难了。我们甚至不会使用该平台的三分之一功能，因此我继续寻找。选择是在TCP和Http客户端服务器之间进行的。在Habré上，我遇到了一篇有关多线程服务器的文章，收集并测试了该文章，出于某种原因，我认为http不允许我创建跨平台解决方案，因此我决定专注于与TCP连接的交互。



服务器的第一个版本包括处理连接，在网页上提供静态内容以及包括用户数据库。首先，我决定构建用于网站的功能，以便稍后在此处处理android和ios上的应用程序。



这是一些代码
, : 



using System;
using System.Net.Sockets;
using System.Net;
using System.Threading;

namespace ClearServer
{

    class Server
    {
        TcpListener Listener;
        public Server(int Port)
        {
            Listener = new TcpListener(IPAddress.Any, Port);
            Listener.Start();

            while (true)
            {
                TcpClient Client = Listener.AcceptTcpClient();
                Thread Thread = new Thread(new ParameterizedThreadStart(ClientThread));
                Thread.Start(Client);
            }
        }

        static void ClientThread(Object StateInfo)
        {
            new Client((TcpClient)StateInfo);
        }

        ~Server()
        {
            if (Listener != null)
            {
                Listener.Stop();
            }
        }

        static void Main(string[] args)
        {
            DatabaseWorker sqlBase = DatabaseWorker.GetInstance;

            new Server(80);
        }
    }
}


: 



using System;
using System.IO;
using System.Net.Sockets;
using System.Text;
using System.Text.RegularExpressions;

namespace ClearServer
{
    class Client
    {


        public Client(TcpClient Client)
        {

            string Message = "";
            byte[] Buffer = new byte[1024];
            int Count;
            while ((Count = Client.GetStream().Read(Buffer, 0, Buffer.Length)) > 0)
            {
                Message += Encoding.UTF8.GetString(Buffer, 0, Count);

                if (Message.IndexOf("\r\n\r\n") >= 0 || Message.Length > 4096)
                {
                    Console.WriteLine(Message);
                    break;
                }
            }

            Match ReqMatch = Regex.Match(Message, @"^\w+\s+([^\s\?]+)[^\s]*\s+HTTP/.*|");
            if (ReqMatch == Match.Empty)
            {
                ErrorWorker.SendError(Client, 400);
                return;
            }
            string RequestUri = ReqMatch.Groups[1].Value;
            RequestUri = Uri.UnescapeDataString(RequestUri);
            if (RequestUri.IndexOf("..") >= 0)
            {
                ErrorWorker.SendError(Client, 400);
                return;
            }
            if (RequestUri.EndsWith("/"))
            {
                RequestUri += "index.html";
            }

            string FilePath = $"D:/Web/TestSite{RequestUri}";

            if (!File.Exists(FilePath))
            {
                ErrorWorker.SendError(Client, 404);
                return;
            }

            string Extension = RequestUri.Substring(RequestUri.LastIndexOf('.'));

            string ContentType = "";

            switch (Extension)
            {
                case ".htm":
                case ".html":
                    ContentType = "text/html";
                    break;
                case ".css":
                    ContentType = "text/css";
                    break;
                case ".js":
                    ContentType = "text/javascript";
                    break;
                case ".jpg":
                    ContentType = "image/jpeg";
                    break;
                case ".jpeg":
                case ".png":
                case ".gif":
                    ContentType = $"image/{Extension.Substring(1)}";
                    break;
                default:
                    if (Extension.Length > 1)
                    {
                        ContentType = $"application/{Extension.Substring(1)}";
                    }
                    else
                    {
                        ContentType = "application/unknown";
                    }
                    break;
            }

            FileStream FS;
            try
            {
                FS = new FileStream(FilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
            }
            catch (Exception)
            {
                ErrorWorker.SendError(Client, 500);
                return;
            }

            string Headers = $"HTTP/1.1 200 OK\nContent-Type: {ContentType}\nContent-Length: {FS.Length}\n\n";
            byte[] HeadersBuffer = Encoding.ASCII.GetBytes(Headers);
            Client.GetStream().Write(HeadersBuffer, 0, HeadersBuffer.Length);

            while (FS.Position < FS.Length)
            {
                Count = FS.Read(Buffer, 0, Buffer.Length);
                Client.GetStream().Write(Buffer, 0, Count);
            }

            FS.Close();
            Client.Close();
        }
    }
}


local SQL: 



using System;
using System.Data.Linq;
namespace ClearServer
{
    class DatabaseWorker
    {

        private static DatabaseWorker instance;

        public static DatabaseWorker GetInstance
        {
            get
            {
                if (instance == null)
                    instance = new DatabaseWorker();
                return instance;
            }
        }


        private DatabaseWorker()
        {
            string connectionStr = databasePath;
            using (DataContext db = new DataContext(connectionStr))
            {
                Table<User> users = db.GetTable<User>();
                foreach (var item in users)
                {
                    Console.WriteLine($"{item.login} {item.password}");
                }
            }
        }
    }
}


, , . ( , - ).



第2章拧紧车轮



在测试服务器操作之后，我得出的结论是，这对于我们的服务将是一个极好的解决方案（破坏者：否），因此该项目开始获得逻辑。

逐步地，新的模块开始出现，并且服务器的功能得到扩展。服务器已获得测试域和连接的ssl加密。



还有一些描述服务器和客户端处理逻辑的代码
, . 



using System;
using System.Net;
using System.Net.Sockets;
using System.Reflection;
using System.Security;
using System.Security.Cryptography.X509Certificates;
using System.Security.Permissions;
using System.Security.Policy;
using System.Threading;


namespace ClearServer
{

    sealed class Server
    {
        readonly bool ServerRunning = true;
        readonly TcpListener sslListner;
        public static X509Certificate serverCertificate = null;
        Server()
        {
            serverCertificate = X509Certificate.CreateFromSignedFile(@"C:\ssl\itinder.online.crt");
            sslListner = new TcpListener(IPAddress.Any, 443);
            sslListner.Start();
            Console.WriteLine("Starting server.." + serverCertificate.Subject + "\n" + Assembly.GetExecutingAssembly().Location);
            while (ServerRunning)
            {
                TcpClient SslClient = sslListner.AcceptTcpClient();
                Thread SslThread = new Thread(new ParameterizedThreadStart(ClientThread));
                SslThread.Start(SslClient);
            }
            
        }
        static void ClientThread(Object StateInfo)
        {
            new Client((TcpClient)StateInfo);
        }

        ~Server()
        {
            if (sslListner != null)
            {
                sslListner.Stop();
            }
        }

        public static void Main(string[] args)
        {
            if (AppDomain.CurrentDomain.IsDefaultAppDomain())
            {
                Console.WriteLine("Switching another domain");
                new AppDomainSetup
                {
                    ApplicationBase = AppDomain.CurrentDomain.SetupInformation.ApplicationBase
                };
                var current = AppDomain.CurrentDomain;
                var strongNames = new StrongName[0];
                var domain = AppDomain.CreateDomain(
                    "ClearServer", null,
                    current.SetupInformation, new PermissionSet(PermissionState.Unrestricted),
                    strongNames);
                domain.ExecuteAssembly(Assembly.GetExecutingAssembly().Location);
            }
            new Server();
        }
    }
}


ssl: 



using ClearServer.Core.Requester;
using System;
using System.Net.Security;
using System.Net.Sockets;

namespace ClearServer
{
    public class Client
    {
        public Client(TcpClient Client)
        {
            SslStream SSlClientStream = new SslStream(Client.GetStream(), false);
            try
            {
                SSlClientStream.AuthenticateAsServer(Server.serverCertificate, clientCertificateRequired: false, checkCertificateRevocation: true);
            }
            catch (Exception e)
            {
                Console.WriteLine(
                    "---------------------------------------------------------------------\n" +
                    $"|{DateTime.Now:g}\n|------------\n|{Client.Client.RemoteEndPoint}\n|------------\n|Exception: {e.Message}\n|------------\n|Authentication failed - closing the connection.\n" +
                    "---------------------------------------------------------------------\n");
                SSlClientStream.Close();
                Client.Close();
            }
            new RequestContext(SSlClientStream, Client);
        }

    }
}






但是，由于服务器仅在TCP连接上工作，因此有必要创建一个可以识别请求上下文的模块。我决定在这里使用一个解析器是合适的，它将把来自客户端的请求分成几个独立的部分，我可以与之交互以便为客户端提供必要的答案。



解析器 
using ClearServer.Core.UserController;
using ReServer.Core.Classes;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Security;
using System.Net.Sockets;
using System.Text;
using System.Text.RegularExpressions;

namespace ClearServer.Core.Requester
{
    public class RequestContext
    {
        public string Message = "";
        private readonly byte[] buffer = new byte[1024];
        public string RequestMethod;
        public string RequestUrl;
        public User RequestProfile;
        public User CurrentUser = null;
        public List<RequestValues> HeadersValues;
        public List<RequestValues> FormValues;
        private TcpClient TcpClient;

        private event Action<SslStream, RequestContext> OnRead = RequestHandler.OnHandle;

        DatabaseWorker databaseWorker = new DatabaseWorker();

        public RequestContext(SslStream ClientStream, TcpClient Client)
        {

            this.TcpClient = Client;
            try
            {
                ClientStream.BeginRead(buffer, 0, buffer.Length, ClientRead, ClientStream);
            }
            catch { return; }
        }
        private void ClientRead(IAsyncResult ar)
        {
            SslStream ClientStream = (SslStream)ar.AsyncState;

            if (ar.IsCompleted)
            {
                Message = Encoding.UTF8.GetString(buffer);
                Message = Uri.UnescapeDataString(Message);
                Console.WriteLine($"\n{DateTime.Now:g} Client IP:{TcpClient.Client.RemoteEndPoint}\n{Message}");
                RequestParse();
                HeadersValues = HeaderValues();
                FormValues = ContentValues();
                UserParse();
                ProfileParse();
                OnRead?.Invoke(ClientStream, this);
            }
        }

        private void RequestParse()
        {
            Match methodParse = Regex.Match(Message, @"(^\w+)\s+([^\s\?]+)[^\s]*\s+HTTP/.*|");
            RequestMethod = methodParse.Groups[1].Value.Trim();
            RequestUrl = methodParse.Groups[2].Value.Trim();
        }
        private void UserParse()
        {
            string cookie;
            try
            {
                if (HeadersValues.Any(x => x.Name.Contains("Cookie")))
                {
                    cookie = HeadersValues.FirstOrDefault(x => x.Name.Contains("Cookie")).Value;
                    try
                    {
                        CurrentUser = databaseWorker.CookieValidate(cookie);
                    }
                    catch { }
                }
            }
            catch { }

        }
        private List<RequestValues> HeaderValues()
        {
            var values = new List<RequestValues>();
            var parse = Regex.Matches(Message, @"(.*?): (.*?)\n");
            foreach (Match match in parse)
            {
                values.Add(new RequestValues()
                {
                    Name = match.Groups[1].Value.Trim(),
                    Value = match.Groups[2].Value.Trim()
                });
            }
            return values;
        }

        private void ProfileParse()
        {
            if (RequestUrl.Contains("@"))
            {
                RequestProfile = databaseWorker.FindUser(RequestUrl.Substring(2));
                RequestUrl = "/profile";
            }
        }
        private List<RequestValues> ContentValues()
        {
            var values = new List<RequestValues>();
            var output = Message.Trim('\n').Split().Last();
            var parse = Regex.Matches(output, @"([^&].*?)=([^&]*\b)");
            foreach (Match match in parse)
            {
                values.Add(new RequestValues()
                {
                    Name = match.Groups[1].Value.Trim(),
                    Value = match.Groups[2].Value.Trim().Replace('+', ' ')
                });
            }
            return values;
        }
    }
}




其实质在于使用正则表达式将请求拆分为多个部分的事实。我们从客户端收到一条消息，请选择第一行，其中包含请求的方法和URL。然后，我们读取标头，将其驱动到HeaderName = Content形式的数组中，并且还找到随附的内容（例如querystring）（如果有），并将其驱动到类似的数组中。此外，解析器还会找出当前客户端是否获得授权并保存其数据。来自授权客户端的所有请求都包含一个授权哈希，该哈希存储在cookie中，因此您可以为两种类型的客户端分离进一步的工作逻辑，并为它们提供正确的答案。



好吧，这是一个小巧的功能，应该在单独的模块中使用，将“ site.com/@UserName”之类的请求转换为动态生成的用户页面。处理完请求后，以下模块起作用。



第3章车把的安装，链条的润滑



解析器完成工作后，处理程序即开始发挥作用，向服务器提供进一步的说明并将控制分为两部分。



简单的处理程序 
using ClearServer.Core.UserController;
using System.Net.Security;
namespace ClearServer.Core.Requester
{
    public class RequestHandler
    {
        public static void OnHandle(SslStream ClientStream, RequestContext context)
        {

            if (context.CurrentUser != null)
            {
                new AuthUserController(ClientStream, context);
            }
            else 
            {
                new NonAuthUserController(ClientStream, context);
            };
        }
    }
}




实际上，只有一次用户授权检查，此后才开始处理请求。



客户端控制器
, \. , . 



using ClearServer.Core.Requester;
using System.IO;
using System.Net.Security;

namespace ClearServer.Core.UserController
{
    internal class NonAuthUserController
    {
        private readonly SslStream ClientStream;
        private readonly RequestContext Context;
        private readonly WriteController WriteController;
        private readonly AuthorizationController AuthorizationController;

        private readonly string ViewPath = "C:/Users/drdre/source/repos/ClearServer/View";

        public NonAuthUserController(SslStream clientStream, RequestContext context)
        {
            this.ClientStream = clientStream;
            this.Context = context;
            this.WriteController = new WriteController(clientStream);
            this.AuthorizationController = new AuthorizationController(clientStream, context);
            ResourceLoad();
        }

        void ResourceLoad()
        {
            string[] blockextension = new string[] {"cshtml", "html", "htm"};
            bool block = false;
            foreach (var item in blockextension)
            {
                if (Context.RequestUrl.Contains(item))
                {
                    block = true;
                    break;
                }
            }
            string FilePath = "";
            string Header = "";
            var RazorController = new RazorController(Context, ClientStream);
            
            switch (Context.RequestMethod)
            {
                case "GET":
                    switch (Context.RequestUrl)
                    {
                        case "/":
                            FilePath = ViewPath + "/loginForm.html";
                            Header = $"HTTP/1.1 200 OK\nContent-Type: text/html";
                            WriteController.DefaultWriter(Header, FilePath);
                            break;
                        case "/profile":
                            RazorController.ProfileLoader(ViewPath);
                            break;
                        default:
//              site.com/page.html
                            if (!File.Exists(ViewPath + Context.RequestUrl) | block)
                            {
                                RazorController.ErrorLoader(404);
                               
                            }                            
                            else if (Path.HasExtension(Context.RequestUrl) && File.Exists(ViewPath + Context.RequestUrl))
                            {
                                Header = WriteController.ContentType(Context.RequestUrl);
                                FilePath = ViewPath + Context.RequestUrl;
                                WriteController.DefaultWriter(Header, FilePath);
                            }                            
                            break;
                    }
                    break;

                case "POST":
                    AuthorizationController.MethodRecognizer();
                    break;

            }

        }

    }
}




, , , .



WriterController 
using System;
using System.IO;
using System.Net.Security;
using System.Text;

namespace ClearServer.Core.UserController
{
    public class WriteController
    {
        SslStream ClientStream;
        public WriteController(SslStream ClientStream)
        {
            this.ClientStream = ClientStream;
        }

        public void DefaultWriter(string Header, string FilePath)
        {
            FileStream fileStream;
            try
            {
                fileStream = new FileStream(FilePath, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
                Header = $"{Header}\nContent-Length: {fileStream.Length}\n\n";
                ClientStream.Write(Encoding.UTF8.GetBytes(Header));
                byte[] response = new byte[fileStream.Length];
                fileStream.BeginRead(response, 0, response.Length, OnFileRead, response);
            }
            catch { }
        }

        public string ContentType(string Uri)
        {
            string extension = Path.GetExtension(Uri);
            string Header = "HTTP/1.1 200 OK\nContent-Type:";
            switch (extension)
            {
                case ".html":
                case ".htm":
                    return $"{Header} text/html";
                case ".css":
                    return $"{Header} text/css";
                case ".js":
                    return $"{Header} text/javascript";
                case ".jpg":
                case ".jpeg":
                case ".png":
                case ".gif":
                    return $"{Header} image/{extension}";
                default:
                    if (extension.Length > 1)
                    {
                        return $"{Header} application/" + extension.Substring(1);
                    }
                    else
                    {
                        return $"{Header} application/unknown";
                    }
            }
        }

        public void OnFileRead(IAsyncResult ar)
        {
            if (ar.IsCompleted)
            {
                var file = (byte[])ar.AsyncState;
                ClientStream.BeginWrite(file, 0, file.Length, OnClientSend, null);
            }
        }

        public void OnClientSend(IAsyncResult ar)
        {
            if (ar.IsCompleted)
            {
                ClientStream.Close();
            }
        }
    }




RazorEngine, . .



RazorController 
using ClearServer.Core.Requester;
using RazorEngine;
using RazorEngine.Templating;
using System;
using System.IO;
using System.Net;
using System.Net.Security;

namespace ClearServer.Core.UserController
{
    internal class RazorController
    {
        private RequestContext Context;
        private SslStream ClientStream;
        dynamic PageContent;


        public RazorController(RequestContext context, SslStream clientStream)
        {
            this.Context = context;
            this.ClientStream = clientStream;

        }

        public void ProfileLoader(string ViewPath)
        {
            string Filepath = ViewPath + "/profile.cshtml";
            if (Context.RequestProfile != null)
            {
                if (Context.CurrentUser != null && Context.RequestProfile.login == Context.CurrentUser.login)
                {
                    try
                    {
                        PageContent = new { isAuth = true, Name = Context.CurrentUser.name, Login = Context.CurrentUser.login, Skills = Context.CurrentUser.skills };
                        ClientSend(Filepath, Context.CurrentUser.login);
                    }
                    catch (Exception e) { Console.WriteLine(e); }

                }
                else
                {
                    try
                    {
                        PageContent = new { isAuth = false, Name = Context.RequestProfile.name, Login = Context.RequestProfile.login, Skills = Context.RequestProfile.skills };
                        ClientSend(Filepath, "PublicProfile:"+ Context.RequestProfile.login);
                    }
                    catch (Exception e) { Console.WriteLine(e); }
                }
            }
            else
            {
                ErrorLoader(404);
            }


        }

        public void ErrorLoader(int Code)
        {
            try
            {
                PageContent = new { ErrorCode = Code, Message = ((HttpStatusCode)Code).ToString() };
                string ErrorPage = "C:/Users/drdre/source/repos/ClearServer/View/Errors/ErrorPage.cshtml";
                ClientSend(ErrorPage, Code.ToString());
            }
            catch { }

        }

        private void ClientSend(string FilePath, string Key)
        {
            var template = File.ReadAllText(FilePath);
            var result = Engine.Razor.RunCompile(template, Key, null, (object)PageContent);
            byte[] buffer = System.Text.Encoding.UTF8.GetBytes(result);
            ClientStream.BeginWrite(buffer, 0, buffer.Length, OnClientSend, ClientStream);
        }

        private void OnClientSend(IAsyncResult ar)
        {
            if (ar.IsCompleted)
            {
                ClientStream.Close();
            }
        }
    }
}






当然，为了验证授权用户的身份，您需要授权。授权模块与数据库交互。从站点上的表单接收到的数据是从上下文中解析的，用户被保存，然后接收cookie并访问服务。



授权模块 
using ClearServer.Core.Cookies;
using ClearServer.Core.Requester;
using ClearServer.Core.Security;
using System;
using System.Linq;
using System.Net.Security;
using System.Text;

namespace ClearServer.Core.UserController
{
    internal class AuthorizationController
    {
        private SslStream ClientStream;
        private RequestContext Context;
        private UserCookies cookies;
        private WriteController WriteController;
        DatabaseWorker DatabaseWorker;
        RazorController RazorController;
        PasswordHasher PasswordHasher;
        public AuthorizationController(SslStream clientStream, RequestContext context)
        {
            ClientStream = clientStream;
            Context = context;
            DatabaseWorker = new DatabaseWorker();
            WriteController = new WriteController(ClientStream);
            RazorController = new RazorController(context, clientStream);
            PasswordHasher = new PasswordHasher();
        }

        internal void MethodRecognizer()
        {
            if (Context.FormValues.Count == 2 && Context.FormValues.Any(x => x.Name == "password")) Authorize();
            else if (Context.FormValues.Count == 3 && Context.FormValues.Any(x => x.Name == "regPass")) Registration();
            else
            {
                RazorController.ErrorLoader(401);
            }
        }

        private void Authorize()
        {
            var values = Context.FormValues;
            var user = new User()
            {
                login = values[0].Value,
                password = PasswordHasher.PasswordHash(values[1].Value)
            };
            user = DatabaseWorker.UserAuth(user);
            if (user != null)
            {
                cookies = new UserCookies(user.login, user.password);
                user.cookie = cookies.AuthCookie;
                DatabaseWorker.UserUpdate(user);
                var response = Encoding.UTF8.GetBytes($"HTTP/1.1 301 Moved Permanently\nLocation: /@{user.login}\nSet-Cookie: {cookies.AuthCookie}; Expires={DateTime.Now.AddDays(2):R}; Secure; HttpOnly\n\n");
                ClientStream.BeginWrite(response, 0, response.Length, WriteController.OnClientSend, null);


            }
            else
            {
                RazorController.ErrorLoader(401);

            }
        }

        private void Registration()
        {
            var values = Context.FormValues;
            var user = new User()
            {
                name = values[0].Value,
                login = values[1].Value,
                password = PasswordHasher.PasswordHash(values[2].Value),
            };
            cookies = new UserCookies(user.login, user.password);
            user.cookie = cookies.AuthCookie;
            if (DatabaseWorker.LoginValidate(user.login))
            {
                Console.WriteLine("User ready");
                Console.WriteLine($"{user.password} {user.password.Trim().Length}");
                DatabaseWorker.UserRegister(user);
                var response = Encoding.UTF8.GetBytes($"HTTP/1.1 301 Moved Permanently\nLocation: /@{user.login}\nSet-Cookie: {user.cookie}; Expires={DateTime.Now.AddDays(2):R}; Secure; HttpOnly\n\n");
                ClientStream.BeginWrite(response, 0, response.Length, WriteController.OnClientSend, null);
            }
            else
            {
                RazorController.ErrorLoader(401);
            }
        }
    }
}




这是数据库处理的样子：



数据库 
using ClearServer.Core.UserController;
using System;
using System.Data.Linq;
using System.Linq;

namespace ClearServer
{
    class DatabaseWorker
    {

        private readonly Table<User> users = null;
        private readonly DataContext DataBase = null;
        private const string connectionStr = @"";

        public DatabaseWorker()
        {
            DataBase = new DataContext(connectionStr);
            users = DataBase.GetTable<User>();
        }

        public User UserAuth(User User)
        {
            try
            {
                var user = users.SingleOrDefault(t => t.login.ToLower() == User.login.ToLower() && t.password == User.password);
                if (user != null)
                    return user;
                else
                    return null;
            }
            catch (Exception)
            {
                return null;
            }

        }

        public void UserRegister(User user)
        {
            try
            {
                users.InsertOnSubmit(user);
                DataBase.SubmitChanges();
                Console.WriteLine($"User{user.name} with id {user.uid} added");
                foreach (var item in users)
                {
                    Console.WriteLine(item.login + "\n");
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
            
        }

        public bool LoginValidate(string login)
        {
            if (users.Any(x => x.login.ToLower() == login.ToLower()))
            {
                Console.WriteLine("Login already exists");
                return false;
            }
            return true;
        }
        public void UserUpdate(User user)
        {
            var UserToUpdate = users.FirstOrDefault(x => x.uid == user.uid);
            UserToUpdate = user;
            DataBase.SubmitChanges();
            Console.WriteLine($"User {UserToUpdate.name} with id {UserToUpdate.uid} updated");
            foreach (var item in users)
            {
                Console.WriteLine(item.login + "\n");
            }
        }
        public User CookieValidate(string CookieInput)
        {
            User user = null;
            try
            {
                user = users.SingleOrDefault(x => x.cookie == CookieInput);
            }
            catch
            {
                return null;
            }
            if (user != null) return user;
            else return null;
        }
        public User FindUser(string login)
        {
            User user = null;
            try
            {
                user = users.Single(x => x.login.ToLower() == login.ToLower());
                if (user != null)
                {
                    return user;
                }
                else
                {
                    return null;
                }
            }
            catch (Exception)
            {
                return null;
            }
        }
    }
}




一切工作都像发条，授权和注册一样，访问该服务的最低功能已经可用，现在该是编写应用程序并将整个工作与完成所有工作的主要功能联系在一起的时候了。



第4章扔掉自行车



为了减少为两个平台编写两个应用程序的人工成本，我决定在Xamarin.Forms上创建一个跨平台。同样，由于它在C＃中。制作了一个仅将数据发送到服务器的测试应用程序后，我遇到了一个有趣的问题。对于来自设备的请求，出于兴趣，我在HttpClient上实现了该请求，并将其扔到服务器HttpRequestMessage上，该服务器包含来自json格式的授权表单中的数据。不出所料，我打开了服务器日志，并看到了来自设备的所有数据请求。有点昏昏欲睡，意识到在一个懒洋洋的夜晚的最后三个星期里所做的一切。为了检查发送数据的准确性，我在HttpListner上收集了一个测试服务器。接收到已经存在的下一个请求后，在几行代码中，我将其解析为多个部分，从表单中接收了KeyValuePair数据。查询的分析减少到两行。



我开始进一步测试，前面没有提到，但是在以前的服务器上，我仍在实现基于websockets的聊天。它工作得很好，但是通过Tcp进行交互的根本原理令人沮丧，为了正确建立两个用户的交互并维护通信日志，必须产生过多的多余信息。这是解析对连接开关的请求并使用RFC 6455协议收集响应，因此，在测试服务器中，我决定创建一个简单的websocket连接。纯粹是为了娱乐。



连接聊天 
 private static async void HandleWebsocket(HttpListenerContext context)
        {
            var socketContext = await context.AcceptWebSocketAsync(null);
            var socket = socketContext.WebSocket;
            Locker.EnterWriteLock();
            try
            {
                Clients.Add(socket);
            }
            finally
            {
                Locker.ExitWriteLock();
            }

            while (true)
            {
                var buffer = new ArraySegment<byte>(new byte[1024]);
                var result = await socket.ReceiveAsync(buffer, CancellationToken.None);
                var str = Encoding.Default.GetString(buffer);
                Console.WriteLine(str);

                for (int i = 0; i < Clients.Count; i++)
                {
                    WebSocket client = Clients[i];

                    try
                    {
                        if (client.State == WebSocketState.Open)
                        {
                            
                            await client.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);
                        }
                    }
                    catch (ObjectDisposedException)
                    {
                        Locker.EnterWriteLock();
                        try
                        {
                            Clients.Remove(client);
                            i--;
                        }
                        finally
                        {
                            Locker.ExitWriteLock();
                        }
                    }
                }
            }
        }






而且有效。服务器自己建立连接，生成一个响应密钥。我什至不必通过ssl单独配置服务器注册，这足以证明证书已经安装在系统上所需的端口上。



在设备端和站点端，两个客户端交换了消息，所有这些都被记录下来。没有巨大的解析器会降低服务器的速度，这都不是必需的。响应时间从200ms减少到40-30ms。我做出了唯一正确的决定。



将当前服务器实现交给Tcp并重写Http下的所有内容。现在，该项目处于重新设计阶段，但已经按照完全不同的交互原理进行了。设备和站点的操作是同步和调试的，并且具有相同的概念，唯一的区别是您不需要为设备生成html页面。



输出量



我认为：“不了解福特，不要把头扎进水里”，在开始工作之前，我应该更清楚地定义目标和目的，并深入研究在各种客户上实施这些技术的必要技术和方法。该项目已经接近完成，但是也许我会再谈谈我又如何获得一些东西。在开发过程中，我学到了很多东西，但是将来还有很多要学的。如果您已经阅读了本文，那么谢谢您。


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