/// <summary>
/// 取得Line Webhook 事件
/// </summary>
/// <param name="httpContext">HttpContext</param>
/// <param name="channelSecret">Line ChannelSecret</param>
/// <returns></returns>
public static async Task <ReceiveEventModel> GetWebhookEvent(HttpContext httpContext, string channelSecret)
{
HttpRequest request = httpContext.Request;
//嘗試取得header中line的Signature
StringValues headerValues;
if (request.Headers.TryGetValue("X-Line-Signature", out headerValues) == false)
{
return(null);
}
ReceiveEventModel receiveEventModel = new ReceiveEventModel();
string lineSignature = headerValues.ToString();
string requestBody = string.Empty;
//[dotnet core 2.2]使用Microsoft.AspNetCore.Http.Internal中的EnableRewind來允許搜尋body(Stream)
//[dotnet core 3.1]使用EnableBuffering來允許搜尋body(Stream)
//HttpContext.Request.Body是一種FrameRequestStream, 會不允許搜尋並跳出例外(NotSupportedException)
//資料[dotnet core 3.1]:https://devblogs.microsoft.com/aspnet/re-reading-asp-net-core-request-bodies-with-enablebuffering/
//資料[dotnet core 2.2]:https://gunnarpeipman.com/aspnet-core-request-body/
//資料[dotnet core 3.1]:https://blog.johnwu.cc/article/asp-net-core-3-read-request-response-body.html
//request.EnableRewind();
request.EnableBuffering();
//取得body資料
using (StreamReader streamReader = new StreamReader(request.Body, Encoding.UTF8, true, 1024, true))
{
//Stream從頭讀到尾
requestBody = await streamReader.ReadToEndAsync();
//Stream讀完後要把Stream Position還原(歸零),否則之後還要讀取Request Body時,
//會從Stream的結尾開始取資料, 導致取出的資料都是空的
request.Body.Seek(0, SeekOrigin.Begin);
}
//對比header的Signature與計算後的是否相同
if (!VerifyXLineSignature(requestBody, lineSignature, channelSecret))
{
return(null);
}
receiveEventModel = JsonConvert.DeserializeObject <ReceiveEventModel>(requestBody);
return(receiveEventModel);
}
public async Task <IActionResult> Webhook()
{
HttpContext httpContext = HttpContext;
LineMessagingClient client = new LineMessagingClient(accessToken);
ReceiveEventModel model = await WebhookRequestMessage.GetWebhookEvent(httpContext, channelSecret);
if (model == null)
{
return(BadRequest());
}
if (model.events == null)
{
return(BadRequest());
}
foreach (EventModel q in model.events)
{
string senderId = "";
switch (q.source.type)
{
case SourceType.user:
senderId = q.source.userId;
break;
case SourceType.room:
senderId = q.source.roomId;
break;
case SourceType.group:
senderId = q.source.groupId;
break;
}
if (q.type == EventType.message)
{
MessageEventTypeUtility messageEventTypeUtility = new MessageEventTypeUtility(accessToken);
#region ReplyMessage
/*ReplyMessageModel replyMessageBody = new ReplyMessageModel()
* {
* replyToken = q.replyToken,
* messages = await messageEventTypeUtility.AutoProcessMessageType(q.message)
* };
*
* await client.ReplyMessageAsync(replyMessageBody);*/
#endregion
#region ReplyMessageWithJson
await client.ReplyMessageWithJsonAsync(q.replyToken, await messageEventTypeUtility.AutoProcessMessageTypeWithJson(q.message));
#endregion
//await client.ReplyMessageWithJsonAsync(q.replyToken, new ApparelFlexMessage().Create2());
#region push message
/*PushMessageModel pushMessageBody = new PushMessageModel()
* {
* to = "someone's UID",
* messages = messageEventTypeUtility.PushMessageType()
* };
* await client.PushMessageAsync(pushMessageBody);*/
#endregion
#region broadcast message
/*BroadcastModel broadcast = new BroadcastModel()
* {
* messages = messageEventTypeUtility.BroadcastMessageType()
* };
* await client.BroadcastMessageAsync(broadcast);*/
#endregion
Console.WriteLine("Sender: " + senderId);
Console.WriteLine("Message: " + q.message.text);
}
else if (q.type == EventType.follow)
{
MessageEventTypeUtility messageEventTypeUtility = new MessageEventTypeUtility(accessToken);
FollowEventTypeUtility followEventTypeProcessor = new FollowEventTypeUtility(accessToken);
UserProfileResponseModel profileModel = await followEventTypeProcessor.GetProfileAsync(q.source.userId);
string text = $"Welcome, {profileModel.displayName}";
ReplyMessageModel replyMessageBody = new ReplyMessageModel()
{
replyToken = q.replyToken,
messages = messageEventTypeUtility.CreateTextMessage(text)
};
await client.ReplyMessageAsync(replyMessageBody);
}
}
return(Ok());
}