otiai10/cf-chat-bridge

Bridge communication between LINE and Slack, by using Google Cloud Functions

Chat Bridge by Google Cloud Functions

Framework for Google Cloud Functions to bridge communications in chat services, such as

• LINE -> Slack
• Slack -> LINE

Example of your index.js

const { Bridge } = require("cf-chat-bridge");

// Your secret variables, see following for more details.
const secrets = require("./your/secrets");
// Your rules to bridge messages, see following for more details.
const rules = require("./your/rules");

// Initialize your bridge.
const bridge = new Bridge({rules, secrets});

// Export your endpoint as a member of module,
// so that Google CloudFunctions can listen /foobar as an endpoint.
exports.foobar = bridge.endpoint();

// Then you can use following endpoints for Slack & LINE webhooks:
//   - Slack: /foobar?source=SLACK
//   - LINE:  /foobar?source=LINE

Example rules

module.exports = [

  /**
   * ONE-WAY bridge: LINE group → SLACK channel(s)
   */
  {
    // From any groups of LINE in which the bot is a member
    source: {
      service: "LINE",
      group: /.*/
    },
    // To "random" channel of Slack in which the bot is a member
    destination: {
      service: "Slack",
      channels: ["random"]
    }
  },

  /**
   * ONE-WAY bridge: Slack channel → LINE group(s)
   */
  {
    source: {
      service: "Slack",
      channel: "dev-test"
    },
    destination: {
      service: "LINE",
      to: ["C3a08fbcbd1c7c3dc4c68d42fb46bd112"],
    },
  },

  /**
   * BOTH-WAY bridge: LINE group ↔ SLACK channel
   */
  {
    pipe: [
      {
        service: "LINE",
        group: "C3a08fbcbd1c7c3dc4c68d42fb46bd112",
      },
      {
        service: "SLACK",
        channel: "general",
      },
    ]
  },
]

Variables you might need

secret.json, like this

{
  "LINE_CHANNEL_SECRET": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
  "LINE_CHANNEL_ACCESS_TOKEN": "xxxxxxxxxxxxxxxxxxxxxxxx",
  "SLACK_APP_VERIFICATION_TOKEN": "xxxxxxxxxxxxxxxxxxxxx",
  "SLACK_APP_OAUTH_ACCESS_TOKEN": "xoxp-xxxxxxxxxxxxxxxxxx"
}

• LINE_CHANNEL_SECRET
  • Secret key to verify request triggered from LINE webhook
  • Created when you create a channel on https://developers.line.me/console/
• LINE_CHANNEL_ACCESS_TOKEN
  • Access token to send message to LINE
  • Created when you create a channel on https://developers.line.me/console/
• SLACK_APP_VERIFICATION_TOKEN
  • Secret key to verify request triggered from Slack webhook
  • Created when you create an app on https://api.slack.com/apps
    • and enable Events API
• SLACK_APP_OAUTH_ACCESS_TOKEN
  • Access token to send message to Slack
  • Created when you create an app on https://api.slack.com/apps
    • and install the app to your workspace

See https://github.com/otiai10/cf-chat-bridge/wiki/Getting-Started for more information about getting started.

How to deploy your index.js to Google Cloud Functions

gcloud functions deploy foobar --trigger-http

See links below for more information

• Cloud Functions - Event-driven Serverless Computing | Google Cloud