line_bot 0.0.2

Library of the LINE Messaging API for Dart. The Library follows the LINE official Messaging API document and helps you to build your Bot much simpler and easier.

Library of the LINE Messaging API for Dart

IMPORTANT: This is not an official SDK by LINE

Introduction

We make it easy to developers to code their bots with Dart! A few steps to create a parser and bot to handle requests and reply messages. The library is based on the official LINE Messaging API Document and inspired by the official SDK: line-bot-sdk-python

Implemented methods, events and messages

• Support parser and test cases for webhook event objects
• Validation with signature from x-line-signature
• Reply message with TextMessage
• Get Bot Info
• Get user profile and followers

Example

import 'dart:convert';
import 'dart:io';

import 'package:line_bot/line_bot.dart';

Future main() async {
  var envVars = Platform.environment;
  var lineChannelSecret = envVars['LINE_CHANNEL_SECRET'];
  var lineChannelAccessToken = envVars['LINE_CHANNEL_ACCESS_TOKEN'];
  var lineBotApi = LineBotApi(lineChannelAccessToken);
  var webhookParser = WebhookParser(lineChannelSecret);
  var server = await HttpServer.bind(
    InternetAddress.loopbackIPv4,
    8080,
  );
  await for (var request in server) {
    if (request.method == 'POST' && request.uri.path == '/callback') {
      handleRequest(request, webhookParser, lineBotApi);
    } else {
      handleUnSupportedRequest(request);
    }
  }
}

void handleRequest(HttpRequest request, WebhookParser webhookParser,
    LineBotApi lineBotApi) async {
  var message;
  var response = request.response;
  var content = await utf8.decoder.bind(request).join();
  try {
    message = webhookParser.parser(
        content.toString(), request.headers['x-line-signature'][0]);
  } on InvalidSignatureError {
    await response
      ..statusCode = HttpStatus.badRequest
      ..write('InvalidSignatureError')
      ..close();
    return;
  }
  if (message.events.isNotEmpty) {
    var messages = [
      Message(type: 'text', text: message.events[0].message.text)
    ];
    await lineBotApi.replyMessage(message.events[0].replyToken, messages);
  }
  response
    ..statusCode = HttpStatus.ok
    ..write('Request Accepted.')
    ..close();
}

void handleUnSupportedRequest(HttpRequest request) {
  var response = request.response;
  response
    ..statusCode = HttpStatus.methodNotAllowed
    ..write('Unsupported request: ${request.method}.')
    ..close();
}

Features and bugs

Please file feature requests and bugs at the issue tracker.