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+# LINE Messaging API
+
+[![NuGet](https://img.shields.io/nuget/v/Line.Messaging.svg)](https://www.nuget.org/packages/Line.Messaging)
+[![NuGet](https://img.shields.io/nuget/dt/Line.Messaging.svg)](https://www.nuget.org/packages/Line.Messaging)
+
+이것은 [LINE Messaging API](https://developers.line.me/messaging-api/overview)의 C#용 구현체입니다.
+
+## 시작하기
+
+이 저장소에는 SDK 본체와 함께 샘플과 Visual Studio용 템플릿이 포함되어 있습니다.
+
+### .Net Standard 클래스 라이브러리
+
+NuGet 관리자를 이용해 프로젝트에 추가할 수 있습니다.
+
+[NuGet 갤러리 | Line.Messaging](https://www.nuget.org/packages/Line.Messaging/)  
+
+### 샘플
+
+SDK를 이용하는 샘플 몇가지가 공개되어 있습니다. 자세한 것은 아래를 참조하시기 바랍니다.
+
+- [Azure Function v1 샘플](https://github.com/pierre3/LineMessagingApi/tree/master/FunctionAppSample)
+- [Azure Function v2 샘플](https://github.com/pierre3/LineMessagingApi/tree/master/FunctionAppSample.v2)
+- [Web App (API) 샘플](https://github.com/pierre3/LineMessagingApi/tree/master/WebAppSample)
+- [Web App (API)와 BotFramework DirectLine 접속 샘플](https://github.com/pierre3/LineMessagingApi/tree/master/WebAppWithBotFrameworkSample)
+
+### Visual Studio 템플릿
+
+템플릿은 마켓플레이스에 공개되어 있습니다만, 내부를 변경하고 싶은 경우를 위해 소스도 공개되어 있습니다.
+
+- [LINE 봇 템플릿 - Visual Studio 마켓플레이스](https://marketplace.visualstudio.com/items?itemName=pierre3.LINEBotCSharpTemplate)
+- [Visual Studio 템플릿 프로젝트](https://github.com/pierre3/LineMessagingApi/tree/master/ProjectTemplate)
+
+# 사용방법
+
+다음 3단계를 통해 SDK를 이용하실 수 있습니다.
+
+- LineMessagingClient의 인스턴스화
+- WebhookApplication을 상속받는 클래스 작성
+- 각 이벤트 발생 시의 로직 구현
+
+## LineMessagingClient 클래스
+
+이 클래스에서 LINE Messaging API 플랫폼과 통신합니다. 내부적으로 HttpClient 기반의 비동기 통신을 이용하고 있으며, 아래와 같은 기능을 제공합니다.
+
+```cs
+Task ReplyMessageAsync(string replyToken, IList<ISendMessage> messages)
+Task ReplyMessageAsync(string replyToken, params string[] messages)
+Task PushMessageAsync(string to, IList<ISendMessage> messages)
+Task PushMessageAsync(string to, params string[] messages)
+Task MultiCastMessageAsync(IList<string> to, IList<ISendMessage> messages)
+Task MultiCastMessageAsync(IList<string> to, params string[] messages)
+Task<ContentStream> GetContentStreamAsync(string messageId)
+Task<UserProfile> GetUserProfileAsync(string userId)
+Task<byte[]> GetContentBytesAsync(string messageId)
+Task<UserProfile> GetGroupMemberProfileAsync(string groupId, string userId)
+Task<UserProfile> GetRoomMemberProfileAsync(string roomId, string userId)
+Task<IList<UserProfile>> GetGroupMemberProfilesAsync(string groupId)
+Task<IList<UserProfile>> GetRoomMemberProfilesAsync(string roomId)
+Task<GroupMemberIds> GetGroupMemberIdsAsync(string groupId, string continuationToken)
+Task<GroupMemberIds> GetRoomMemberIdsAsync(string roomId, string continuationToken = null)
+Task LeaveFromGroupAsync(string groupId)
+Task LeaveFromRoomAsync(string roomId)
+```
+
+## Webhook 이벤트 파싱
+
+GetWebhookEventsAsync 확장 메서드를 호출하여, 요청(리퀘스트)에서 LINE 이벤트를 취득할 수 있습니다. 예시) [FunctionAppSample/HttpTriggerFunction.sc](https://github.com/pierre3/LineMessagingApi/blob/master/FunctionAppSample/HttpTriggerFunction.cs)
+
+```cs
+using Line.Messaging;
+using Line.Messaging.Webhooks;
+using Microsoft.Azure.WebJobs;
+using Microsoft.Azure.WebJobs.Extensions.Http;
+using Microsoft.Azure.WebJobs.Host;
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace FunctionAppSample
+{
+  public static class HttpTriggerFunction
+  {
+    static LineMessagingClient lineMessagingClient;
+
+    static HttpTriggerFunction()
+    {
+      lineMessagingClient = new LineMessagingClient(System.Configuration.ConfigurationManager.AppSettings["ChannelAccessToken"]);
+      var sp = ServicePointManager.FindServicePoint(new Uri("https://api.line.me"));
+      sp.ConnectionLeaseTimeout = 60 * 1000;
+    }
+
+    [FunctionName("LineMessagingApiSample")]
+    public static async Task<HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = null)]HttpRequestMessage req, TraceWriter log)
+    {
+      IEnumerable<WebhookEvent> events;
+      try
+      {
+        //Parse Webhook-Events
+        var channelSecret = System.Configuration.ConfigurationManager.AppSettings["ChannelSecret"];
+        events = await req.GetWebhookEventsAsync(channelSecret);
+      }
+      catch (InvalidSignatureException e)
+      {
+        //Signature validation failed
+        return req.CreateResponse(HttpStatusCode.Forbidden, new { Message = e.Message });
+      }
+
+      try
+      {
+        var connectionString = System.Configuration.ConfigurationManager.AppSettings["AzureWebJobsStorage"];
+        var tableStorage = await LineBotTableStorage.CreateAsync(connectionString);
+        var blobStorage = await BlobStorage.CreateAsync(connectionString, "linebotcontainer");
+        //Process the webhook-events
+        var app = new LineBotApp(lineMessagingClient, tableStorage, blobStorage, log);
+        await app.RunAsync(events);
+      }
+      catch (Exception e)
+      {
+        log.Error(e.ToString());
+      }
+
+      return req.CreateResponse(HttpStatusCode.OK);
+    }
+  }
+
+}
+```
+
+## Webhook 이벤트 처리
+
+WebhookApplication를 상속받는 클래스를 작성하여, 각종 이벤트 발생 시의 로직을 구현합니다.
+
+```cs
+public abstract class WebhookApplication
+{
+  protected virtual Task OnMessageAsync(MessageEvent ev);
+  protected virtual Task OnJoinAsync(JoinEvent ev);
+  protected virtual Task OnLeaveAsync(LeaveEvent ev);
+  protected virtual Task OnFollowAsync(FollowEvent ev);
+  protected virtual Task OnUnfollowAsync(UnfollowEvent ev);
+  protected virtual Task OnBeaconAsync(BeaconEvent ev);
+  protected virtual Task OnPostbackAsync(PostbackEvent ev);
+}
+
+```
+
+마지막으로 작성한 클래스의 인스턴스를 작성하여, RunAsync 메서드에 파싱한 LINE 이벤트를 넘겨줍니다. 예시) [Line.Messaging/Webhooks/WebhookApplication.cs](https://github.com/pierre3/LineMessagingApi/blob/master/Line.Messaging/Webhooks/WebhookApplication.cs)
+
+```cs
+class LineBotApp : WebhookApplication
+{
+  private LineMessagingClient MessagingClient { get; }
+  private TraceWriter Log { get; }
+  
+  public WebhookApplication(LineMessagingClient lineMessagingClient,TraceWriter log)
+  {
+      MessagingClient = lineMessagingClient;
+      Log = log;
+  }
+
+  protected override async Task OnMessageAsync(MessageEvent ev)
+  {
+    Log.Info($"SourceType:{ev.Source.Type},SourceId:{ev.Source.Id}");
+    switch (ev.Message.Type)
+    {
+      case EventMessageType.Text:
+        await MessagingClient.ReplyMessageAsync(ev.ReplyToken, ((TextEventMessage)ev.Message).Text);
+        break;
+
+      case EventMessageType.Image:
+      case EventMessageType.Audio:
+      case EventMessageType.Video:
+      case EventMessageType.File:
+      case EventMessageType.Location:
+      case EventMessageType.Sticker:
+        break;
+
+    }
+  }
+
+  protected override async Task OnFollowAsync(FollowEvent ev)
+  {
+      throw new NotImplementedException();
+  }
+
+  protected override async Task OnUnfollowAsync(UnfollowEvent ev)
+  {
+      throw new NotImplementedException();
+  }
+
+  protected override async Task OnJoinAsync(JoinEvent ev)
+  {
+    throw new NotImplementedException();
+  }
+
+  protected override async Task OnLeaveAsync(LeaveEvent ev)
+  {
+    throw new NotImplementedException();
+  }
+
+  protected override Task OnBeaconAsync(BeaconEvent ev)
+  {
+    throw new NotImplementedException();
+  }
+
+  protected override async Task OnPostbackAsync(PostbackEvent ev)
+  {
+    throw new NotImplementedException();
+  }
+
+}
+```
+
+자세한 것은 각 샘플을 참조하시기 바랍니다.