Day13-Webhook 实作（二）LINEBot 之 Echo bot

大家好～
昨天我们已经将 LINEBot 安装完成啦～
今天来做个 Echo bot 简单认识一下 LINEBot 的实作过程吧～

Webhook 测试

首先来为我们的 Webhook 准备好 Route 与 Controller 吧！

php artisan make:controller LinebotController

routes/api.php

Route::post('/linebot-reply',[LinebotController::class,'reply']);

app/Http/Controllers/LinebotController.php

use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\Log;
use LINE\LINEBot\HTTPClient\CurlHTTPClient;
use LINE\LINEBot;

public function reply(Request $request)
{
    Log::info($request->all());
    return response('HTTP_OK',Response::HTTP_OK);
}

先来测试 Webhook 连线是否正常吧～
顺便看看 Request body 长怎样。
至於 URL 就先用 ngrok 协助我们测试吧！

在 Messaging API settings 的页面下可以设定 Webhook URL，
按下 Verify 可以测试我们的 API 是否可以成功接收 Request。

然後记得要启用 Webhook 喔。
下图就是用 Line 传送文字讯息给我们的 LINEBot 後所获得的 Request body 格式。

Echo bot 实作

app/Http/Controllers/LinebotController.php

public function reply(Request $request)
{
    $httpClient = new CurlHTTPClient(env('LINE_BOT_CHANNEL_ACCESS_TOKEN'));
    $bot = new LINEBot($httpClient, ['channelSecret' => env('LINE_BOT_CHANNEL_SECRET')]);
    
    try {
        $bot->parseEventRequest($request->getContent(), $request->header('X-Line-Signature'));
    }catch (LINEBot\Exception\InvalidSignatureException $exception){
        return response('An exception class that is raised when signature is invalid.',Response::HTTP_FORBIDDEN);
    }catch (LINEBot\Exception\InvalidEventRequestException $exception){
        return response('An exception class that is raised when received invalid event request.',Response::HTTP_FORBIDDEN);
    }
    
    $text = $request['events'][0]['message']['text'];
    $replyToken = $request['events'][0]['replyToken'];
    $response = $bot->replyText($replyToken, $text);
    
    if ($response->isSucceeded()){
        return response('HTTP_OK', Response::HTTP_OK);
    }else{
        Log::debug($response->getHTTPStatus());
        Log::debug($response->getRawBody());
        return response('HTTP_UNPROCESSABLE_ENTITY', Response::HTTP_UNPROCESSABLE_ENTITY);
    }

要记得将 Channel access token 与 Channel secret 写入 .env 喔～
成果如下图。