# ninwa

node input watcher

## requirements

- evtest
- node.js
- [nvm](https://github.com/nvm-sh/nvm)

## setup (as root)

- install nvm  

- to load nvm restart your terminal or `source ~/.nvm/nvm.sh`  

- clone the project (to '/opt/ninwa')  
`git clone https://git.velvettear.de/velvettear/ninwa.git /opt/ninwa`

- install and switch to a supported node.js version (automatically done via .nvmrc file) 
`nvm install`

- install the required modules  
`npm install`

- switch back to your system's default node.js version
`nvm deactivate`

- execute ninwa  
`nvm run ninwa.js`

## systemd

**for security reasons it is highly recommended to not run ninwa with root permissions!**

- create a new system user  
`useradd -U -r -s /usr/bin/nologin node`

- make your install of nvm available to the new user  
`cp -R ~/.nvm /opt/nvm`  
`chown -R node /opt/nvm`

- symlink the provided systemd-service file and modify it according to your needs  
`ln -s /opt/ninwa/ninwa.service /etc/systemd/system/ninwa.service`

- reload systemd-services  
`systemctl daemon-reload`

- enable and start ninwa as a systemd-service  
`systemctl enable --now ninwa`

## configuration

configuration is done entirely within the file `config.json`. 

### server: [*object*]  
- address: [*string*] server address to listen on (`0.0.0.0` to listen on all interfaces)
- port: [*number*] port to listen on

### log: [*object*]  
- level: [*string*] verbosity of the log; either `debug`, `info`, `warning` or `error`  
- timestamp: [*string*] format string for the timestamp; review [moment.js](https://momentjs.com/docs/#/displaying/format/) for further information

### combos: [*object*]
- delay: [*number*] time in milliseconds until a combo will be reset

### watchers: [*object-array*]  
- device: [*string*] name of or path to an input device; ninwa automatically tries to locate the device in `/dev/input` and `/dev/input/by-id/` if only a name is given  
- restart: [*boolean*] restart watcher on close
- sudo: [*boolean*] use sudo to start the evtest process
- keys: [*object-array*]  
    - key: [*string*] name of the key
    - combo: [*string-array*] name of one or more keys (in order)
    - event: [*string*] [event type](https://www.kernel.org/doc/html/latest/input/event-codes.html) to filter evtest's output for 
    - type: [*string*] type of the key event; either `keyup`, `keydown` or `keyhold`
    - delay: [*number*] time in milliseconds until the key will be registered again (mostly useful for keyhold-events; **unavailable for combos**)
    - command: [*string*] name of the command to execute on key press / combo end
    

### commands: [*object*]
- *name*: [*object*]
    - cmd: [*string*] command / path to script to execute  
    - args: [*string-array*] arguments to pass to the executed command
    - sudo: [*boolean*] use sudo to execute the command

**note:**  
if you intend to use ninwa as a systemd-service with `sudo` make sure the configured user is allowed to execute the command without entering a password. **otherwise your service will just stop at the password prompt!**

- `sudo visudo`  
- `username ALL=(ALL) NOPASSWD: command`