proxy pattern

DesignPattern/DesignPattern.sln

@@ -23,6 +23,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Decorator", "Decorator\Deco
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Facade", "Facade\Facade.csproj", "{968D6295-75C3-46FF-AAB9-1579DB405B31}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Proxy", "Proxy\Proxy.csproj", "{F6C67C41-900D-4606-A6D6-BA059D6485A0}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -69,6 +71,10 @@ Global
 		{968D6295-75C3-46FF-AAB9-1579DB405B31}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{968D6295-75C3-46FF-AAB9-1579DB405B31}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{968D6295-75C3-46FF-AAB9-1579DB405B31}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F6C67C41-900D-4606-A6D6-BA059D6485A0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F6C67C41-900D-4606-A6D6-BA059D6485A0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F6C67C41-900D-4606-A6D6-BA059D6485A0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F6C67C41-900D-4606-A6D6-BA059D6485A0}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

DesignPattern/Proxy/App.config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" />
+    </startup>
+</configuration>

DesignPattern/Proxy/Client.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Proxy
+{
+	class Client
+	{
+		public static void HowToTest(string url)
+		{
+			IWeb web = new ProxyWeb();
+			string result = web.Visit(url);
+
+			Console.WriteLine(result);
+		}
+	}
+}

DesignPattern/Proxy/IWeb.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Proxy
+{
+	interface IWeb
+	{
+		string Visit(string url);
+	}
+}

DesignPattern/Proxy/Program.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Proxy
+{
+	/*
+	 * 카테고리: 구조 패턴
+	 * 개요: 클라이언트가 사용을 원하는 객체를 직접 사용하는것이 아니라
+	 * 객체에 대한 대리자(Proxy) 역할을 하는 객체를 두고 이를 통해 사용하는 방식
+	 */
+	class Program
+	{
+		static void Main(string[] args)
+		{
+			Client.HowToTest("https://phishingsite.com");
+
+			Console.ReadKey();
+		}
+	}
+}

DesignPattern/Proxy/Properties/AssemblyInfo.cs

@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// 어셈블리에 대한 일반 정보는 다음 특성 집합을 통해 
+// 제어됩니다. 어셈블리와 관련된 정보를 수정하려면
+// 이러한 특성 값을 변경하세요.
+[assembly: AssemblyTitle("Proxy")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Proxy")]
+[assembly: AssemblyCopyright("Copyright ©  2022")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// ComVisible을 false로 설정하면 이 어셈블리의 형식이 COM 구성 요소에 
+// 표시되지 않습니다. COM에서 이 어셈블리의 형식에 액세스하려면
+// 해당 형식에 대해 ComVisible 특성을 true로 설정하세요.
+[assembly: ComVisible(false)]
+
+// 이 프로젝트가 COM에 노출되는 경우 다음 GUID는 typelib의 ID를 나타냅니다.
+[assembly: Guid("f6c67c41-900d-4606-a6d6-ba059d6485a0")]
+
+// 어셈블리의 버전 정보는 다음 네 가지 값으로 구성됩니다.
+//
+//      주 버전
+//      부 버전 
+//      빌드 번호
+//      수정 버전
+//
+// 모든 값을 지정하거나 아래와 같이 '*'를 사용하여 빌드 번호 및 수정 번호를
+// 기본값으로 할 수 있습니다.
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

DesignPattern/Proxy/Proxy.csproj

@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{F6C67C41-900D-4606-A6D6-BA059D6485A0}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>Proxy</RootNamespace>
+    <AssemblyName>Proxy</AssemblyName>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Client.cs" />
+    <Compile Include="IWeb.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="ProxyWeb.cs" />
+    <Compile Include="RealWeb.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

DesignPattern/Proxy/ProxyWeb.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Proxy
+{
+	class ProxyWeb : IWeb
+	{
+		private IWeb realWeb = new RealWeb();
+
+		List<string> BAD_SITES = new List<string>()
+		{
+			"https://hackersite.com",
+			"https://fraudsite.com",
+			"https://phishingsite.com"
+		};
+
+		public string Visit(string url)
+		{
+			if (BAD_SITES.Contains(url.ToLower()))
+				return "BAD_SITES";
+
+			return realWeb.Visit(url);
+		}
+	}
+}

DesignPattern/Proxy/RealWeb.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Proxy
+{
+	class RealWeb : IWeb
+	{
+		public string Visit(string url)
+		{
+			WebClient wc = new WebClient();
+
+			return wc.DownloadString(url);
+		}
+	}
+}