#!/bin/sh
# The MIT License (MIT)
#
# Copyright (c) 2017 Adar Nimrod <nimrod@shore.co.il>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

# Auto login to WiFi portals, currently the israeli train and Kavim buses.
# Requires: cURL, sh, awk, logger, nmcli.
# To install, clone the repo, cd to this directory and run:
#
# sudo cp --preserve=mode wifi-login /etc/NetworkManager/dispatcher.d/90wifi-login
#
# If you don't want to clone the repo but you just want this script, run:
#
# curl https://git.shore.co.il/nimrod/rcfiles/-/raw/master/Documents/bin/wifi-login | sudo tee /etc/NetworkManager/dispatcher.d/90wifi-login
# sudo chmod +x /etc/NetworkManager/dispatcher.d/90wifi-login

set -eu

# shellcheck disable=SC2142
alias wifi-portal='curl --silent --fail --write-out "%{redirect_url}" --output /dev/null http://detectportal.firefox.com/success.txt'

die () {
    logger -p user.err "$@"
    exit 1
}

iswifi () {
    # TODO: Check if a network interface is passed.
    [ "$(nmcli --terse --fields GENERAL.TYPE device show "$1" | awk -F: '{print $2}')" = 'wifi' ]
}

wifi_connection () {
    nmcli --terse --fields GENERAL.CONNECTION device show "$1" | awk -F: '{print tolower(r$2)}'
}

if [ $# -ne 2 ]
then
    echo "Usage: $0 interface action"
    exit 1
else
    interface="$1"
    action="$2"
fi

command -v curl > /dev/null || die "Can't login to the WiFi network, cURL is not installed."
command -v awk > /dev/null || die "Can't login to the WiFi network, awk is not installed."
command -v logger > /dev/null || die "Can't login to the WiFi network, logger is not installed."
command -v nmcli > /dev/null || die "Can't login to the WiFi network, nmcli is not installed."

echo "$action" | grep -xq 'up\|dhcp4-change\|dhcp6-change\|connectivity-change' || \
    die "Can't login to the WiFi network, action $action isn't up nor changed."
iswifi "$interface" || die "Can't login to the WiFi network, interface $interface isn't WiFi"
redirect_url="$(wifi-portal)" || die "Can't login to the WiFi network. failed to get the redirect URL."
logger -p user.debug "wiFi redirect url: $redirect_url"
[ "$redirect_url" != "" ] || die "Can't login to the WiFi network, not behind a captive portal."
connection="$(wifi_connection "$interface")"
if [ "$connection" = "kavim-wifi" ]
then
    login_url="$(echo "$redirect_url&command=login&access_mode=open&name=" | sed 's@https://[a-zA-Z0-9_/:\.\-\?]*\?@https://guest1.ic.peplink.com/cp/login?@')"
elif [ "$connection" = "israel-railways" ]
then
    login_ip="$(echo "$redirect_url" | grep --only-matching '[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*')" || die "Can't login to the train WiFi, redirect URL doesn't contain an IP."
    logger -p user.debug "Train WiFi login IP: $login_ip"
    login_url="http://$login_ip/loginHandler.php?allowAccess=true"
else
    die "Can't login to WiFi, not a known SSID."
fi
logger -p user.debug "WiFi login URL: $login_url"
http_code="$(curl --output /dev/null --silent --write-out '%{http_code}' "$login_url")"
logger -p user.debug "WiFi login HTTP code: $http_code"
redirect_url="$(wifi-portal)" || die "Failed to get the redirect URL."
if [ "$redirect_url" = "" ]
then
    logger -p user.debug "Successfully logged in to the WiFi network."
else
    logger -p user.debug "Failed to login to the WiFi network, still redirecting to a captive portal."
fi