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_posts/2020-02-10-javascript-live-chat-tutorial-free-alternative-to-firebase.md
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@ -10,9 +10,11 @@ The chat is offline-first and end-to-end encrypted. It is stored and propagated
No signup of any kind required: just generate a key pair for the chat recipient. Optionally spin up your own free heroku instance to relay messages. **Cost $0**.
# 1. Include iris, gun and sea
# 1. Include gun, sea and iris
Sea is gun's cryptography library.
* [Gun](https://github.com/amark/gun): a decentralized database
* [Sea](https://gun.eco/docs/SEA): gun's cryptography library
* [Iris](https://github.com/irislib/iris-lib): a library for decentralized social networking
```
<script src="https://cdn.jsdelivr.net/npm/gun/gun.js"></script>
@ -26,7 +28,7 @@ Sea is gun's cryptography library.
var gun = new Gun({peers: ['https://gun-eu.herokuapp.com/gun']})
```
You can connect to someone else's gun node, or you can easily spin up one using Heroku or Docker.
You can connect to someone else's gun node, or you can easily [deploy your own](https://github.com/amark/gun#deploy).
# 3. Create a key for the user (chat initiator)
@ -98,6 +100,8 @@ Feel free to inspect the element and override the stylesheet to match your site'
Check it out on [Codepen](https://codepen.io/mmalmi/pen/bGddeqE) or [Github](https://irislib.github.io/iris-lib/example/chatbox/)
# Technical notes
# Notes
Chats are persisted in users' browsers. Heroku nodes are ephemeral: their filesystem is reset once in a while. If you want to persist the chats on a server, you can add S3 storage to your heroku gun instance, or run a docker gun node.
Disclaimer: Messages are e2e encrypted, but message timestamps currently aren't. In a decentralized network the timestamp and message author are visible to anyone. The library has not been security audited, so don't use it for privacy critical purposes.