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server/README.md
2026-01-08 16:03:35 +01:00

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<p align="center">
<a href="https://imgfloat.kruhlmann.dev"><img src="src/main/resources/assets/banner.png" /></a>
<video width="830" controls>
<source src="https://github.com/Kruhlmann/imgfloat-j/raw/refs/heads/master/src/main/resources/demo.webm" type="video/webm">
</video>
</p>
A Spring Boot overlay server for Twitch broadcasters and their channel admins. Broadcasters can authorize via Twitch OAuth and invite channel admins to manage images that float over a transparent canvas. Updates are pushed in real time over WebSockets so OBS browser sources stay in sync.
## Running
Define the following required environment variables:
| Variable | Description | Example Value |
|----------|-------------|---------------|
| `IMGFLOAT_ASSETS_PATH` | Filesystem path to store uploaded assets | /var/imgfloat/assets |
| `IMGFLOAT_PREVIEWS_PATH` | Filesystem path to store generated image previews | /var/imgfloat/previews |
| `IMGFLOAT_DB_PATH` | Filesystem path to the SQLite database file | /var/imgfloat/imgfloat.db |
| `IMGFLOAT_INITIAL_TWITCH_USERNAME_SYSADMIN` | Twitch username of the initial sysadmin user | example_broadcaster |
| `IMGFLOAT_GITHUB_OWNER` | Github user or org which has the client repository | Kruhlmann |
| `IMGFLOAT_GITHUB_REPO` | Client repository name | imgfloat-j |
| `SPRING_SERVLET_MULTIPART_MAX_FILE_SIZE` | Maximum upload file size | 10MB |
| `SPRING_SERVLET_MULTIPART_MAX_REQUEST_SIZE` | Maximum upload request size | 10MB |
| `IMGFLOAT_GITHUB_OWNER` | GitHub owner used to build desktop download links | Kruhlmann |
| `IMGFLOAT_GITHUB_REPO` | GitHub repo used to build desktop download links | imgfloat-j |
| `TWITCH_CLIENT_ID` | Oauth2 client id | i1bjnh4whieht5kzn307nvu3rn5pqi |
| `TWITCH_CLIENT_SECRET` | Oauth2 client secret | vpkn8cp7ona65l121j6q78l9gkmed3 |
Optional:
| Variable | Description | Example Value |
|----------|-------------|---------------|
| `TWITCH_REDIRECT_URI` | Override default redirect URI | http://localhost:8080/login/oauth2/code/twitch |
During development environment variables can be placed in the `.env` file at the project root to automatically load them. Be aware that these are only loaded when using the [Makefile](./Makefile) command `make run`.
If you want to use the default development setup your `.env` file should look like this:
```sh
TWITCH_CLIENT_ID=...
TWITCH_CLIENT_SECRET=...
IMGFLOAT_GITHUB_OWNER=...
IMGFLOAT_GITHUB_REPO=...
IMGFLOAT_INITIAL_TWITCH_USERNAME_SYSADMIN=...
```