firejail-handler-youtube-ctl

#!/bin/sh
#
## Youtube URL handler for Firejail
#+ (1) inside the sandbox `firejail-handler-youtube` drops a URL at a read/write accessible location
#+ (2) outside the sandbox this script picks up the URL and starts sandboxed media play

# shellcheck disable=SC2034

### vars
## source common settings
_settings_file="firejail-handler-settings-extra.inc"        
if [ -f "${HOME}/.config/firejail/${_settings_file}" ]; then        
    #+ use settings defined by user         
    . "${HOME}/.config/firejail/${_settings_file}"        
elif [ -f "/etc/firejail/${_settings_file}" ]; then        
    #+ use system-wide settings         
    . "/etc/firejail/${_settings_file}"        
else        
    #+ fall back to hard-coded values        
    if [ "$(which xdg-user-dir)" ]; then        
	_drop_dir="$(xdg-user-dir DOWNLOAD)"        
    else        
	_xdg_config_home="$(env | grep -c "XDG_CONFIG_HOME")"        
	if [ "$_xdg_config_home" = 1 ]; then        
	    if [ -s "${XDG_CONFIG_HOME}/user-dirs.dirs" ]; then        
		_drop_dir="$(grep "^XDG_DOWNLOAD_DIR=" "${XDG_CONFIG_HOME}/user-dirs.dirs" | awk '{split($0,a,"="); print a[2]}' | sed 's/"//g')"        
	    fi
	elif [ -s "${HOME}/.config/user-dirs.dirs" ]; then        
	    _drop_dir="$(grep "^XDG_DOWNLOAD_DIR=" "${HOME}/.config/user-dirs.dirs" | awk '{split($0,a,"="); print a[2]}' | sed 's/"//g')"        
	else        
	    _drop_dir="${HOME}/Downloads"
	fi
    fi
    # bittorrent client watch dir for .torrent files 
    _download_dir="$_drop_dir"
    ## drop dir location where the URL data will be saved temporarily 
    #+ IMPORTANT: this needs to be read/write accessible in the sandbox 
    _drop_dir="${_drop_dir}/.firejail-dropzone"
    ## protocol handlers 
    #+ bittorrent
    _drop_file_bt="${_drop_dir}/bittorrent.drop"
    _media_dl_mode="local"
    _rpc_bin="/usr/local/bin/transmission-remote"
    _rpc_port_local="9091"
    _rpc_port_tunnel="9999"
    _sshfs_mountpoint="/mnt/sshfs-remote"
    _systemd_service="transmission-daemon"
    #+ youtube
    _drop_file_yt="${_drop_dir}/youtube.drop"
    _media_player_bin="/usr/local/bin/mpv"
fi

_selfie="$(basename "$0")"


### logic
# ensure drop location exists
[ ! -d "$_drop_dir" ] && mkdir -p "$_drop_dir"

# ensure needed commands are available
if [ ! -x "/usr/bin/inotifywait" ]; then
    echo "Command not found: /usr/bin/inotifywait - aborting"
	exit 1
fi
if [ ! -x "$_media_player_bin" ]; then
    echo "Command not found: ${_cmd} - aborting"
	exit 1
fi

## watch drop location
[ -e "$_drop_file_yt" ] && rm -f "$_drop_file_yt"
touch "$_drop_file_yt"
inotifywait -m -e modify --format '%f' "$_drop_file_yt" | while read -r line
do
    if [ -s "$_drop_file_yt" ]; then
        #+ get URL
        _url="$(head -n 1 "$_drop_file_yt")"
        #+ start sandboxed media play
        "$_media_player_bin" "$_url" &
        # reset
        truncate -s 0 "$_drop_file_yt" &
    fi
done

exit 0