Share channels between Slack accounts!

We are big fans of Slack and have been using it for a while now. Our friends at [Vizzuality][vizzuality] started using it recently and we missed not being able to speak with them, so I just created a quick service to link two channels from two Slack organizations.

How can I set it up?

Dead simple, follow this steps from each organization's account.

1. Create a channel you want to share with another organization.
2. Create an Incoming WebHook itntegration and select the channel you created.
3. Copy the Incoming WebHook token (you can find it in the left column from the integration page).
4. Create a URL with the following format: http://slackline.herokuapp.com/bridge/?token=[TOKEN]&domain=[YOUR_SLACK_DOMAIN] send it to the person setting up the other organization.
5. The person setting up the other organization will send you a similar URL with their domain and token, create an Outgoing WebHook with that URL and the channel you created in step 1.

Once you have done this in both organizations, you will have a chat-room shared by both organizations.

Here you have an example of a Outgoing WebHook URL:

http://slackline.herokuapp.com/bridge/?token=bcaa5867b1d42142b74eDVA4&domain=avengers.slack.com

How does it work?

We are just bridging hooks, we don't store any messages going through the bridge.

ToDo

We don't support custom avatars right now.

If somebody from Slack is reading this, it would be great to be able to set the icon_url for the message to be something like http://[DOMAIN]/avatar/[USER_ID] to set the USER_ID based on the information from the Outgoing WebHook with no extra requests or state.