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Tohora

A web UI to run on balenaDash. Make post requests with a URL parameter to have the server launch a subprocess and show the submitted URL on screen.

Quick video demo below (click to play on YouTube). The "Hello World" page is our base WPE_URL:

Tohora demo

How to compile

To compile for raspi:

env GOOS=linux GOARCH=arm GOARM=5 go build

How to use on a balenaDash device

Copy the binary and templates directory onto the raspi and run it:

chmod +x tohora
./tohora PORT COMMAND
  • PORT is the port number. Use 80 for vanilla http
  • COMMAND is the command that the URL is passed to. On balenaDash, use WPELauncher e.g. ./tohora 80 WPELauncher. For manual testing/development try-outs use sleep or something equally harmless, e.g. go run tohora.go 8000 sleep.

Access over the internet

In balena, open port 80 on your docker container and turn on the public URL feature. Then the web UI will be served at the public URL.

Slack integration

After opening the public URL (see above), add a slack app to allow you to throw URLs onto your screen. Start at https://api.slack.com/apps?new_app=1 and set up a new "Slash command" like this:

Post or Slack an empty URL or click the 'Clear' button to clear the screen.

Using from scripts

Make changes to your display by sending POST requests with a url parameter to /launch/ from any other app/language that can communicate over HTTP.

Here's an example with curl:

curl --data-urlencode "url=https://www.google.com/?q=tohora&a=b" http://<Device IP address>:8080/launch/

Note that URL encoding (aka percent encoding) is necessary here, otherwise the ampersand is interpreted as a separation character and &a=b isn't included in the value of url. curl -d doesn't do exactly the same thing. Be careful to think about encoding if you are calling from other languages too.

tohora Copyright (C) 2019 Richard Morrison www.rmorrison.net

This program comes with ABSOLUTELY NO WARRANTY; for details see `LICENSE`.
This is free software, and you are welcome to redistribute it
under certain conditions; see `LICENSE` for details.