firejail-xdg-open

#!/bin/sh
#
## HTTP(S) URL handler for Firejail
#+ custom `xdg-open` wrapper

## IMPORTANT ##############################################
#+ install this file as /usr/local/bin/xdg-open to ensure the wrapper works as expected
#########################################################

# shellcheck disable=SC2154

### vars
## source common settings
_settings_file="firejail-handler-settings-http.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
    _browser_bin="/usr/bin/firefox"
    _debug=0
    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
    _drop_dir="${_drop_dir}/.firejail-dropzone"
    _drop_file="${_drop_dir}/firejail.drop"
    _xdg_open_wrapper_bin="/usr/local/bin/xdg-open"
fi

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


### logic

# debug
if [ "$_debug" = 1 ]; then
    echo "$@" > "${_drop_dir}/${_selfie}.log"
    exit 0
fi

## triage
case "$1" in
    http://*|https://*)
        #+ regular HTTP(S) traffic goes to running browser
        "$_browser_bin" "$1" &
        ;;
    *)
        #+ all other traffic goes to system-wide xdg-open
        /usr/bin/xdg-open "$@" &
        ;;
esac

exit 0