#!/usr/bin/env bash
# pilpil client installer v0.1
#
# https://sharats.me/posts/shell-script-best-practices/
set -o errexit
set -o nounset
set -o pipefail
if [[ "${TRACE-0}" == "1" ]]; then
    set -o xtrace
fi

# Change to script dir
cd "$(dirname "$0")"

#l10n
. gettext.sh
export TEXTDOMAINDIR="$PWD"
export TEXTDOMAIN="$(basename $0)"

# Colored output
#~ set +x
bold=$(tput bold)
function red(){
    echo -e "${bold}\x1B[31m$1 \x1B[0m"
    if [ ! -z "${2-}" ]; then
    echo -e "\x1B[31m $($2) \x1B[0m"
    fi
}
function green(){
    echo -e "${bold}\x1B[32m$1 \x1B[0m"
    if [ ! -z "${2-}" ]; then
    echo -e "\x1B[32m $($2) \x1B[0m"
    fi
}
function yellow(){
    echo -e "${bold}\x1B[33m$1 \x1B[0m"
    if [ ! -z "${2-}" ]; then
    echo -e "\x1B[33m $($2) \x1B[0m"
    fi
}

# Display help if -h(elpf) used
if [[ "${1-}" =~ ^-*h(elp)?$ ]]; then
    echo -e "`gettext \"Usage: ./pilpil-server.sh path_to_device

This script will setup as much pilpil-clients as needed.\"`"
    exit
fi
# Set dry run if -d(ry) used
DRY_RUN=0
if [[ "${1-}" =~ ^-*d(ry)?$ ]]; then
    DRY_RUN=1
    yellow "`gettext \"!!! Running in dry mode. No modifications will be made.\n\"`"
fi
# Options
# Device block to write on 
if [[ ! "$DRY_RUN" ]]; then
    SDCARD="${1}"
else
    SDCARD="${2-}"
fi
# TODO : accomodate for devices block with name mmcblk0p1|p2
if [[ "$SDCARD" == "" ]] || [[ ! -e "$SDCARD" ]]
then 
    red "`gettext \"Please specify an existing device block for your sd-card, e.g: '/dev/sda'.\"`" >&2
    exit 0
fi
DD_BS="128K"
DISK_IMAGE="$HOME/niels/imgs/2022-10-25-pilpil-WIP.img.xz"
if [[ ! -f "$DISK_IMAGE" ]]; then 
    red "`gettext \"Disk image not found, aborting...\"`" >&2
    exit 0
fi
CONFIG_DIR="$HOME/niels/pilpil-server"
if [[ ! -d "$CONFIG_DIR" ]]; then 
    red "`gettext \"Config directory not found, aborting...\"`" >&2
    exit 0
fi
HTTP_SECRET=$(openssl rand -base64 12)
PI_USER="pil"
BOOT_MOUNT="/run/media/$USER/boot"
ROOTFS_MOUNT="/run/media/$USER/rootfs"
#~ LOCAL_MEDIA_DIR="$HOME/Videos"
LOCAL_MEDIA_DIR="$HOME/niels/medias"
if [[ ! -d "$LOCAL_MEDIA_DIR" ]]; then 
    red "`gettext \"Medias directory not found, aborting...\"`" >&2
    exit 0
fi
REMOTE_MEDIA_DIR="$ROOTFS_MOUNT/home/$PI_USER/Videos"
# WIFI AP config
IP_RANGE="10.42.0.1"
SSID="omen"
PASSWD="EpQmSmXH123"
IFW="wlo1"
#Band (bg = 2.4Ghz, a= 5Ghz)
BAND="bg"
# Hidden SSID
#~ HIDE="802-11-wireless.hidden false"
# Set channel manually
CHAN="802-11-wireless.channel 1"
#
#
#  0. Create AP connection
#
green "`gettext \"  * Creating hotspot connection in NetworkManager \n\"`"
if [[ ! "$DRY_RUN" ]]; then
    # If connection exists, delete it
    nmcli con delete $SSID
    nmcli con add type wifi ifname $IFW con-name $SSID autoconnect yes ssid $SSID
    nmcli con modify $SSID 802-11-wireless.mode ap 802-11-wireless.band "${BAND-}" "${CHAN-}" "${HIDE-}" ipv4.method shared
    nmcli con modify $SSID wifi-sec.key-mgmt wpa-psk
    nmcli con modify $SSID 802-11-wireless-security.proto rsn
    nmcli con modify $SSID 802-11-wireless-security.pairwise ccmp
    nmcli con modify $SSID wifi-sec.psk $PASSWD
fi
# 0.a set IP range on server
green "`eval_gettext \"  * Setting IP range \\\$IP_RANGE/24 in /etc/NetworkManager/system-connections/\\\$SSID.nmconnection ... \n\"`"
if [[ ! "$DRY_RUN" ]]; then
    sudo sed -i "/method=shared/a address1=$IP_RANGE/24, $IP_RANGE" /etc/NetworkManager/system-connections/$SSID.nmconnection
    # Remove existing leases
    sudo rm /var/lib/NetworkManager/dnsmasq-$IFW.leases
    # restart NM
    sudo systemctl restart NetworkManager
    # Turn hotspot on
    nmcli radio wifi on
    nmcli con up $SSID
fi
# 0.b ask for number of clients
# This will be used to determine static IP
yellow "`gettext \"Number of clients to configure : \"`"
read -n 4 CLIENT_NUMBER
# Check input
if [[ ! "${CLIENT_NUMBER}" =~ ^[0-9]+$ ]]; then 
    red "`gettext \"\nInput was not a number, aborting.\n\"`"
    exit 0
fi
if [[ "${CLIENT_NUMBER}" -lt 1 ]]; then
        red "`gettext \"\nInput was 0, nothing to do.\n\"`"
        exit 0
fi
green "`eval_gettext \"Got \\\$CLIENT_NUMBER...\n\"`"
# For some reason networkmanager finds it clever to offer only IPs in range 10-255 even when asked for a /24, /28, etc...
# So IPs start at 10
# Get first IP in specified range
#~ IP=$(echo $IP_RANGE | awk -F. '{print $4}')
FIRST=1
IP=10
#~ echo -e "First IP is $(($RANGE_START)) ...\n"
# Remove IP's last byte
IP_RANGE_3B=$(echo $IP_RANGE | awk -F. '{print $1"."$2"."$3"."}')
echo -e "`eval_gettext \"First IP is \\\$IP_RANGE_3B\\\$IP ...\n\"`"
# Generate SSL cert with IPs in IP_RANGE
IP_CNT=$IP
IP_ARRAY=()

while [[ "$IP_CNT" -lt $(("${CLIENT_NUMBER-}"+"${IP-}")) ]] 
do
    IP_ARRAY+=("IP:$IP_RANGE_3B$IP_CNT")
    ((IP_CNT++))
done
# Convert array to string
HOST_LIST="$(IFS=","; echo "${IP_ARRAY[*]}")"
green "`eval_gettext \"Got host list : \\\$HOST_LIST \n\"`"
#  5. Generate valid ssl cert/key for every IP in range
# https://unix.stackexchange.com/questions/104171/create-ssl-certificate-non-interactively
green "`eval_gettext \"Generating SSL crt/key for \\\$HOST_LIST...\n\"`"
if [[ ! "$DRY_RUN" ]]; then
    openssl req -new -newkey rsa:4096 -days 1825 -nodes -x509 \
    -subj "/C=/ST=Denial/L=/O=/CN=$IP_RANGE$FIRST" \
    -addext "subjectAltName=$HOST_LIST" \
    -keyout "$CONFIG_DIR/selfCA.key" -out "$CONFIG_DIR/selfCA.crt"
    #sudo openssl req -x509 -nodes -days 3650 -newkey rsa:2048 -keyout "$ROOTFS_MOUNT/etc/ssl/private/nginx-selfsigned.key" -out "$ROOTFS_MOUNT/etc/ssl/certs/nginx-selfsigned.crt"
fi
# Proceed with each host
for HOST in "${IP_ARRAY[@]}"
do
    HOST=$(echo $HOST | awk -F: '{print $2}')
    HOST_NAME="pilpil-$(echo $HOST | awk -F. '{print $4}')"
    #  1. Copy img to sd
    green "`eval_gettext \"1/14 : Imaging \\\$SDCARD with the file \\\$DISK_IMAGE ...\n\"`"
    red  "`eval_gettext \"Are you sure you want to ERASE THE CONTENT of \\\$SDCARD ? Type uppercase 'yes' to confirm.\"`"
    read -n 4 GO_DD
    if [[ "$GO_DD" != "`gettext \"YES\"`" ]]
    then
        red "`gettext \"Answer was different from 'YES'. Aborting...\"`" >&2
        break
    fi
    red "`eval_gettext \"Received answer \\\$GO_DD. Running dd on \\\$SDCARD in 5 seconds.\"`"
    if [[ ! "$DRY_RUN" ]]; then
        sleep 5
    fi
    GO_DD=0
    # unmount / remount new filesystem
    green "`eval_gettext \"2/14 : Unmounting \\\$BOOT_MOUNT and \\\$ROOTFS_MOUNT ...\n\"`"
    if [[ ! "$DRY_RUN" ]]; then
        umount $BOOT_MOUNT
        umount $ROOTFS_MOUNT
        xzcat "$DISK_IMAGE" | sudo dd of=$SDCARD bs="$DD_BS" oflag=dsync status=progress && sync
    fi
    green "`eval_gettext \"3/14 : Remounting \\\$BOOT_MOUNT and \\\$ROOTFS_MOUNT ...\n\"`" 
    if [[ ! "$DRY_RUN" ]]; then
        sleep 1
        systemctl --user restart gvfs-udisks2-volume-monitor
        sleep 3
    fi
    green "`eval_gettext \"4/14 : Changing hostname to \\\$HOST_NAME in \\\$ROOTFS_MOUNT/etc/hostname and \\\$ROOTFS_MOUNT/etc/hosts ...\n\"`" 
    if [[ ! "$DRY_RUN" ]]; then
        # Change hostname
        echo "$HOST_NAME" | sudo tee "$ROOTFS_MOUNT/etc/hostname"
        # Reflect that in /etc/hosts
        sudo sed -i "$d" "$ROOTFS_MOUNT/etc/hosts"
        echo -e "127.0.1.1\t$HOST_NAME" | sudo tee -a "$ROOTFS_MOUNT/etc/hosts"
    fi
    ## Enable SSH
    green "`eval_gettext \"5/14 : Enabling SSH server on boot : \\\$BOOT_MOUNT/ssh ...\n\"`" 
    if [[ ! "$DRY_RUN" ]]; then
        touch "$BOOT_MOUNT/ssh"
        sync
    fi
    ## Generate SSH private/public key and install it - Disable passwd login
    green "`eval_gettext \"6/14 : Generating private/public SSH key as \\\$HOME/.ssh/\\\$HOST_NAME ...\n\"`" 
    if [[ ! "$DRY_RUN" ]]; then
        ssh-keygen -t ed25519 -f "$HOME/.ssh/$HOST_NAME" -N ""
    fi
    red "`eval_gettext \"New SSH key pair generated as \\\$HOME/.ssh/\\\$HOST_NAME. Add to ~/.ssh/config ? (y/n)\"`"
    read -n 2 ADD_SSH_CONF
    if [[ "$ADD_SSH_CONF" == "`gettext \"y\"`" ]];then
        green "`eval_gettext \"Adding \\\$HOST_NAME with ip \\\$HOST in \\\$HOME/.ssh/config\"`"
        if [[ ! "$DRY_RUN" ]]; then
            # Add to ~/.ssh/config
            echo -e "\nHost $HOST_NAME\n\tHostname $HOST\n\tIdentityFile ~/.ssh/$HOST_NAME\n\tUser $PI_USER" | tee -a "$HOME/.ssh/config"
        fi
    else
        yellow "`gettext \"\nAnswer was different from 'y', skipping...\"`"
    fi
    # Copy public key to rpi
    green "`eval_gettext \"7/14 : Installing public SSH key \\\$HOME/.ssh/\\\$HOST.pub in \\\$ROOTFS_MOUNT/home/\\\$PI_USER/.ssh/authorized_keys...\n\"`" 
    if [[ ! "$DRY_RUN" ]]; then
        sudo cp "$HOME/.ssh/$HOST_NAME.pub" "$ROOTFS_MOUNT/home/$PI_USER/.ssh/authorized_keys"
        sync
    fi
    # Disable PW login
    green "`eval_gettext \"8/14 : Disabling SSH password based login in \\\$ROOTFS_MOUNT/etc/ssh/sshd_config ...\n\"`" 
    if [[ ! "$DRY_RUN" ]]; then
        echo -e "PasswordAuthentication no\nChallengeResponseAuthentication no\nUsePAM no" | sudo tee -a "$ROOTFS_MOUNT/etc/ssh/sshd_config"
        sync
    fi
    #  3. Configure wifi with static IP
    green "`eval_gettext \"9/14 : Configuring wireless connection to \\\$SSID with pw \\\$PASSWD :  ...\n\"`" 
    if [[ ! "$DRY_RUN" ]]; then
        echo "ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=FR

network={
    ssid=\"$SSID\" # Nom du réseau auquel on se connecte
    psk=\"$PASSWD\" # Mot de passe wifi
    # Optional parameters
    # scan_ssid=1 # hidden ssid 
    # Specify 2.4 or 5G freq
    # https://w1.fi/cgit/hostap/tree/wpa_supplicant/wpa_supplicant.conf#n910
    # https://fr.wikipedia.org/wiki/Liste_des_canaux_Wi-Fi#Bande_2,4_GHz
    # scan_freq=2412 2437 2462
}" | sudo tee "$ROOTFS_MOUNT/etc/wpa_supplicant/wpa_supplicant.conf"
        sync
    fi
    # Request specific IP to dhcp server
    green "`eval_gettext \"10/14 : Setting static IP \\\$HOST in \\\$ROOTFS_MOUNT/etc/dhcpcd.conf...\n\"`" 
    if [[ ! "$DRY_RUN" ]]; then
        echo -e "interface wlan0\nrequest $HOST" | sudo tee -a "$ROOTFS_MOUNT/etc/dhcpcd.conf"
        sync
    fi
    #  5. Install previously generated SSL key/crt
    green "`eval_gettext \"11/14 : Installing SSL : \\\$CONFIG_DIR/selfCA.crt and $CONFIG_DIR/selfCA.key in \\\$ROOTFS_MOUNT/etc/ssl/certs/ and \\\$ROOTFS_MOUNT/etc/ssl/private/nginx-selfsigned.key...\n\"`" 
    if [[ ! "$DRY_RUN" ]]; then
        sudo cp "$CONFIG_DIR/selfCA.crt" "$ROOTFS_MOUNT/etc/ssl/certs/nginx-selfsigned.crt" 
        sudo cp "$CONFIG_DIR/selfCA.key" "$ROOTFS_MOUNT/etc/ssl/private/nginx-selfsigned.key"
        sync
    fi
    green "`eval_gettext \"12/14 : Installing http auth secrets in \\\$CONFIG_DIR/pilpil-server.toml, \\\$ROOTFS_MOUNT/home/pil/.config/systemd/user/vlc.service and \\\$ROOTFS_MOUNT/home/pil/pilpil-client/defaults.toml...\n\"`" 
    if [[ ! "$DRY_RUN" ]]; then
        #~ Change VLC/pilpil http auth secret
        sed -i "s:secret:$HTTP_SECRET:g" "$CONFIG_DIR/pilpil-server.toml"
        sed -i "s:secret:$HTTP_SECRET:g" "$ROOTFS_MOUNT/home/pil/.config/systemd/user/vlc.service" 
        sed -i "s:secret:$HTTP_SECRET:g" "$ROOTFS_MOUNT/home/pil/pilpil-client/defaults.toml" 
    fi
    #~ #  6. Copy medias
    green "`eval_gettext \"13/14 : Syncing media folder \\\$LOCAL_MEDIA_DIR/ with \\\$REMOTE_MEDIA_DIR/ \n\"`" 
    if [[ ! "$DRY_RUN" ]]; then
        # Remove filler file
        if [[ -f "$REMOTE_MEDIA_DIR/remove_me"  ]]; then 
            sudo rm "$REMOTE_MEDIA_DIR/remove_me"
        fi
    fi
    if [[ -d "$ROOTFS_MOUNT" ]]; then 
        # Get available space on rootfs
        ROOTFS_AVAILABLE_SPACE=$(df -t ext4 -P "$ROOTFS_MOUNT"  | tail -1 | awk '{print $4}')
        yellow "`eval_gettext \"Space available on rootfs : \\\$ROOTFS_AVAILABLE_SPACE sectors\"`"
        # Get Media folder size
        MEDIA_SIZE=$(du -c "$LOCAL_MEDIA_DIR" | tail -1 | awk '{print $1}')
        yellow "`eval_gettext \"Size of medias : \\\$MEDIA_SIZE sectors\"`"
    fi
    if [[ ! "$DRY_RUN" ]]; then
        # Only copy files if enough space available
        if [[ "$MEDIA_SIZE" -lt "$ROOTFS_AVAILABLE_SPACE" ]]; then
            USER_ID=$( cat "$ROOTFS_MOUNT/etc/passwd" | grep $PI_USER | awk -F: '{print $3}' )
            GROUP_ID=$( cat "$ROOTFS_MOUNT/etc/passwd" | grep $PI_USER | awk -F: '{print $4}' )
            sudo cp "$LOCAL_MEDIA_DIR/"* "$REMOTE_MEDIA_DIR/"
            sudo chown -R $USER_ID:$GROUP_ID "$REMOTE_MEDIA_DIR"
            sync
        else
            red "`eval_gettext \"Not enough space on \\\$ROOTFS_MOUNT, skipping...\"`" 
        fi
    fi
    # Unmount FS
    green "`gettext \"14/14 : Unmounting filesystems\"`"
    if [[ ! "$DRY_RUN" ]]; then
        umount "$BOOT_MOUNT"
        umount "$ROOTFS_MOUNT"
    fi
    yellow "`eval_gettext \"Client $(($IP-9))/$CLIENT_NUMBER.\"`"
    #~ echo "$IP / $(($IP_CNT-1))"
    if [[ "$IP" -lt "$(($IP_CNT-1))" ]]; then
        red "`gettext \"Please swap sd card in reader and enter uppercase 'yes' then Return to proceed with next client or directly hit Return to exit:\"`"
        read -n 4 GO_ON
        if [ "$GO_ON" != "`gettext \"YES\"`" ]
        then
            red "`gettext \"Answer was different from 'YES'. Aborting...\n\"`" >&2
            break
        fi
        GO_ON=0
        ((IP++))
    else
        green "`gettext \"All done !\"`"
        # Remove SSL private key
        #~ rm -f "$CONFIG_DIR/selfCA.key"
        break
    fi
done
# Remove SSL private key
rm -f "$CONFIG_DIR/selfCA.key"
yellow "`gettext \"Nothing more to do.\"`"
exit 1