TL;DR

GCP のCloudFunctionsでLINE NotifyのAPIをキックする
slackのOutgoing Webhooksに登録するとslackの通知をLINEに転送できるようになる

準備

gcloudコマンド

gcloud components install alpha

デプロイ先の gs のbucket

gsutil mb -p PROJECT_ID gs://BUCKET_NAME

実装

npm package


npm init
npm install config --save
npm instlal request --save

script

index.js

/**
 * HTTP Cloud Function.
 *
 * @param {Object} req Cloud Function request context.
 * @param {Object} res Cloud Function response context.
 */

var request = require('request');
var config = require('config');
var lineConfigAccessToken = config.Line.access_token;

exports.sendLineNotify = function sendLineNotify (req, res) {
  var options = {
    url: 'https://notify-api.line.me/api/notify',
    method: 'POST',
    headers: {
      'Content-Type':'application/x-www-form-urlencoded',
      'Authorization': 'Bearer ' + lineConfigAccessToken,
    },
    form: { message : `${req.body.text}` }
  };
  // request LINE Notify
  request(options, recallback);

  function recallback(error, response, body) {
    if (error == true) {
      console.log(body);
    }
  }

  res.send('ok');
};

config

LINE Notifyのaccess_tokenを取得して config/production.jsonに記述する

config/production.json

{
  "Line": {
    "access_token": "ACCESS_TOKEN"
  }
}

deploy


-> % gcloud alpha functions deploy FUNCTION_NAME --stage-bucket BUCKET_NAME --trigger-http

Copying file:///var/folders/rt/gg6z17_51z3_l4jf7rtmgvc00000gn/T/tmpGwi1cH/fun.zip [Content-Type=application/zip]...
- [1 files][  1.1 MiB/  1.1 MiB]
Operation completed over 1 objects/1.1 MiB.
Waiting for operation to finish...done.
availableMemoryMb: 256
entryPoint: FUNCTION_NAME
gcsUrl: gs://BUCKET_NAME/us-central1-FUCNTIONNAME-xxxxxxxxxxx.zip
httpsTrigger:
  url: https://us-central1-PROJECT_ID.cloudfunctions.net/FUNCTION_NAME
latestOperation: operations/d3d3LXRrbnprLWNvbS91cy1jZW50cmFsMS9zZW5kTGluZU5vdGlmeS9PNEV0ZHFlZ3dRaw
name: projects/PROJECT_ID/locations/us-central1/functions/FUNCTION_NAME
status: READY
timeout: 60s

test call

deployのときに表示された triggerの urlに対してcurlで POST Request

curl -X POST https://us-central1-PROJECT_ID.cloudfunctions.net/FUNCTION_NAME -H "Content-Type:application/json" --data '{"text":"from gcf text message"}'

Ref

https://cloud.google.com/functions/