#!/usr/bin/with-contenv bash

if [[ "${OPENVPN_PROVIDER}" == "**None**" ]] || [[ -z "${OPENVPN_PROVIDER-}" ]]; then
    echo "[OpenVPN] Provider not set. Exiting..."
    rm -rf /etc/services.d/openvpn && exit 1
fi

# Validate OpenVPN config
source /etc/scripts/openvpn-config-validation.sh

# add OpenVPN user/pass
if [[ "${OPENVPN_USERNAME}" == "**None**" ]] || [[ "${OPENVPN_PASSWORD}" == "**None**" ]] ; then
    if [[ ! -f "/config/openvpn/${VPN_PROVIDER}-openvpn-credentials.txt" ]] ; then
        echo "[OpenVPN] credentials not set. Exiting." | ts '%Y-%m-%d %H:%M:%S'
        rm /etc/services.d/openvpn/run
        exit 1
    fi
    echo "[OpenVPN] Found existing credentials..." | ts '%Y-%m-%d %H:%M:%S'
else
    # make auth file from env
    echo "${OPENVPN_USERNAME}" > "/config/openvpn/${VPN_PROVIDER}-openvpn-credentials.txt"
    echo "${OPENVPN_PASSWORD}" >> "/config/openvpn/${VPN_PROVIDER}-openvpn-credentials.txt"
    chmod 600 "/config/openvpn/${VPN_PROVIDER}-openvpn-credentials.txt"
    chown abc:abc "/config/openvpn/${VPN_PROVIDER}-openvpn-credentials.txt"

    USERNAME_CHAR_CHECK=$(echo "${OPENVPN_USERNAME}" | grep -E -o -m 1 '[^a-zA-Z0-9@]+')
    if [[ ! -z "${USERNAME_CHAR_CHECK}" ]]; then
        echo "[OpenVPN] username contains characters which could cause authentication issues, please consider changing this if possible" | ts '%Y-%m-%d %H:%M:%S'
    fi

    PASSWORD_CHAR_CHECK=$(echo "${OPENVPN_PASSWORD}" | grep -E -o -m 1 '[^a-zA-Z0-9@]+')
    if [[ ! -z "${PASSWORD_CHAR_CHECK}" ]]; then
        echo "[OpenVPN] password contains characters which could cause authentication issues, please consider changing this if possible" | ts '%Y-%m-%d %H:%M:%S'
    fi
fi

# Remove existing ns, docker injects ns from host and isp ns can block/hijack
> /etc/resolv.conf

# Split comma separated string into list from NAME_SERVERS env variable
IFS=',' read -ra NAME_SERVER_LIST <<< "${NAME_SERVERS}"

# Process name servers in the list
for NAME_SERVER_ITEM in "${NAME_SERVER_LIST[@]}"; do
    # strip whitespace from start and end of name_server_item
    NAME_SERVER_ITEM=$(echo "${NAME_SERVER_ITEM}" | sed -e 's~^[ \t]*~~;s~[ \t]*$~~')
    echo "[info] Adding ${NAME_SERVER_ITEM} to /etc/resolv.conf" | ts '%Y-%m-%d %H:%M:%S'
    echo "nameserver ${NAME_SERVER_ITEM}" >> /etc/resolv.conf
done

# If CREATE_TUN_DEVICE is set, create /dev/net/tun
if [[ "${CREATE_TUN_DEVICE,,}" == "true" ]]; then
    mkdir -p /dev/net
    mknod /dev/net/tun c 10 200
    chmod 0666 /dev/net/tun
fi

## If we use LOCAL_NETWORK we need to grab network config info
if [[ -n "${LOCAL_NETWORK-}" ]]; then
    eval $(/sbin/ip route list match 0.0.0.0 | awk '{if($5!="tun0"){print "GW="$3"\nINT="$5; exit}}')
fi

if [[ -n "${LOCAL_NETWORK-}" ]]; then
    if [[ -n "${GW-}" ]] && [[ -n "${INT-}" ]]; then
        for LOCAL_NET in ${LOCAL_NETWORK//,/ }; do
            echo "[info] Adding route to local network ${LOCAL_NET} via ${GW} dev ${INT}" | ts '%Y-%m-%d %H:%M:%S'
            /sbin/ip route add "${LOCAL_NET}" via "${GW}" dev "${INT}"
        done
    fi
fi