Day13-Webhook 實作（二）LINEBot 之 Echo bot

2021 iThome 鐵人賽

DAY 13

Software Development

Laravel 新手初見 API系列第 13 篇

13th鐵人賽 laravel line bot

Rui

團隊好想工作室V5.0

2021-09-28 05:35:35

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大家好～
昨天我們已經將 LINEBot 安裝完成啦～
今天來做個 Echo bot 簡單認識一下 LINEBot 的實作過程吧～

Webhook 測試

首先來為我們的 Webhook 準備好 Route 與 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);
}

先來測試 Webhook 連線是否正常吧～
順便看看 Request body 長怎樣。
至於 URL 就先用 ngrok 協助我們測試吧！

在 Messaging API settings 的頁面下可以設定 Webhook URL，
按下 Verify 可以測試我們的 API 是否可以成功接收 Request。

然後記得要啟用 Webhook 喔。
下圖就是用 Line 傳送文字訊息給我們的 LINEBot 後所獲得的 Request body 格式。

Echo bot 實作

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);
    }

要記得將 Channel access token 與 Channel secret 寫入 .env 喔～
成果如下圖。