#!/bin/bash

# T&M Hansson IT AB © - 2022, https://www.hanssonit.se/
# Copyright © 2021 Simon Lindner (https://github.com/szaimen)

true
SCRIPT_NAME="Veracrypt"
SCRIPT_EXPLAINER="This script automates formatting, encrypting and mounting drives with Veracrypt."
# shellcheck source=lib.sh
source /var/scripts/fetch_lib.sh

# Check for errors + debug code and abort if something isn't right
# 1 = ON
# 0 = OFF
DEBUG=0
debug_mode

# Check if root
root_check

# Show explainer
msg_box "$SCRIPT_EXPLAINER"

if ! is_this_installed veracrypt
then
    if ! yesno_box_yes "Do you want to install $SCRIPT_NAME?"
    then
        exit 1
    fi
    msg_box "Please note that in order to install Veracrypt on your server, \
we need to add a 3rd Party PPA, which theoretically could set your server under risk."
    if ! yesno_box_yes "Do you want to continue nonetheless?"
    then
        exit 1
    fi
    msg_box "We will now install Veracrypt. This can take a long time. Please be patient!"
    add-apt-repository ppa:unit193/encryption -y
    apt-get update -q4 & spinner_loading
    apt-get install veracrypt --no-install-recommends -y
fi

# Discover drive
msg_box "Please disconnect your drive for now and connect it again AFTER you hit OK.
Otherwise we will not be able to detect it."
CURRENT_DRIVES=$(lsblk -o KNAME,TYPE | grep disk | awk '{print $1}')
count=0
while [ "$count" -lt 60 ]
do
    print_text_in_color "$ICyan" "Please connect your drive now."
    sleep 5 & spinner_loading
    echo ""
    NEW_DRIVES=$(lsblk -o KNAME,TYPE | grep disk | awk '{print $1}')
    if [ "$CURRENT_DRIVES" = "$NEW_DRIVES" ]
    then
        count=$((count+5))
    else
        msg_box "A new drive was found. We will continue with the mounting now.
Please leave it connected."
        break
    fi
done

# Exit if no new drive was found
if [ "$count" -ge 60 ]
then
    msg_box "No new drive found within 60 seconds.
Please run this option again if you want to try again."
    exit 1
fi

# Get all new drives
mapfile -t CURRENT_DRIVES <<< "$CURRENT_DRIVES"
for drive in "${CURRENT_DRIVES[@]}"
do
    NEW_DRIVES=$(echo "$NEW_DRIVES" | grep -v "^$drive")
done

# Partition menu
args=(whiptail --title "$TITLE" --menu \
"Please select the drive that you would like to format and encrypt with Veracrypt.
$MENU_GUIDE" "$WT_HEIGHT" "$WT_WIDTH" 4)

# Get information that are important
mapfile -t NEW_DRIVES <<< "$NEW_DRIVES"
for drive in "${NEW_DRIVES[@]}"
do
    DRIVE_DESCRIPTION=$(lsblk -o NAME,SIZE,VENDOR,MODEL | grep "^$drive" | awk '{print $2, $3, $4}')
    args+=("/dev/$drive" " $DRIVE_DESCRIPTION")
done

# Show the drive menu
DEVICE=$("${args[@]}" 3>&1 1>&2 2>&3)
if [ -z "$DEVICE" ]
then
    exit 1
fi

# Ask for password
while :
do
    PASSWORD=$(input_box_flow "Please enter the Password that you would like to use for encrypting your drive '$DEVICE'
It should be a strong password.
If you want to cancel, just type in 'exit' and press [ENTER].")
    if [ "$PASSWORD" = "exit" ]
    then
        exit 1
    fi
    if yesno_box_no "Have you saved the password at a safe place?"
    then
        break
    fi
done

# Last info box
if ! yesno_box_no "Warning: Are you really sure, that you want to format the drive '$DEVICE' and encrypt it?
All current files on the drive will be erased!
Select 'Yes' to continue with the process. Select 'No' to cancel."
then
    exit 1
fi

# Inform user
msg_box "We will now format the drive '$DEVICE' and encrypt it with Veracrypt. Please be patient!"

# Wipe drive
dd if=/dev/urandom of="$DEVICE" bs=1M count=2
parted "$DEVICE" mklabel gpt --script
parted "$DEVICE" mkpart primary 0% 100% --script

# Wait so that veracrypt doesn't fail
sleep 1

# Format drive
# https://relentlesscoding.com/posts/encrypt-device-with-veracrypt-from-the-command-line/
if ! echo "$PASSWORD" \
| veracrypt --text --quick \
--non-interactive \
--create "$DEVICE"1 \
--volume-type=normal \
--encryption=AES \
--hash=SHA-512 \
--filesystem=NTFS \
--stdin > /dev/null
then
    msg_box "Something failed while encrypting with Veracrypt."
    exit 1
fi

# Inform user
msg_box "Formatting and encryption with Veracrypt was successful!"

# Mount it
if ! yesno_box_yes "Do you want to mount the encrypted partition to your server?"
then
    exit 1
fi

# Get PARTUUID
PARTUUID=$(lsblk -o PATH,PARTUUID | grep "^$DEVICE"1 | awk '{print $2}')

# Enter the mountpoint
while :
do
    MOUNT_PATH=$(input_box_flow "Please type in the directory where you want to mount the partition.
One example is: '/mnt/data'
The directory has to start with '/mnt/'
If you want to cancel, type 'exit' and press [ENTER].")
    if [ "$MOUNT_PATH" = "exit" ]
    then
        exit 1
    elif echo "$MOUNT_PATH" | grep -q " "
    then
        msg_box "Please don't use spaces!"
    elif ! echo "$MOUNT_PATH" | grep -q "^/mnt/"
    then
        msg_box "The directory has to stat with '/mnt/'"
    elif grep -q " $MOUNT_PATH " /etc/fstab
    then
        msg_box "The mountpoint already exists in fstab. Please try a different one."
    elif mountpoint -q "$MOUNT_PATH"
    then
        msg_box "The mountpoint is already mounted. Please try a different one."
    elif echo "$MOUNT_PATH" | grep -q "^/mnt/ncdata"
    then
        msg_box "The directory isn't allowed to start with '/mnt/ncdata'"
    elif echo "$MOUNT_PATH" | grep -q "^/mnt/smbshares"
    then
        msg_box "The directory isn't allowed to start with '/mnt/smbshares'"
    else
        mkdir -p "$MOUNT_PATH"
        if ! echo "$PASSWORD" | veracrypt -t -k "" --pim=0 --protect-hidden=no \
--fs-options=windows_names,uid=www-data,gid=www-data,umask=007 \
"/dev/disk/by-partuuid/$PARTUUID" "$MOUNT_PATH"
        then
            msg_box "Something failed while trying to mount the Volume. Please try again."
        else
            break
        fi
    fi
done

# Create automount script
# Unfortunately the automount via crypttab doesn't work (when using a passphrase-file)
if ! [ -f "$SCRIPTS/veracrypt-automount.sh" ]
then
    cat << AUTOMOUNT > "$SCRIPTS/veracrypt-automount.sh"
#!/bin/bash

# Secure the file
chown root:root "$SCRIPTS/veracrypt-automount.sh"
chmod 700 "$SCRIPTS/veracrypt-automount.sh"

# Reset maintenance mode to disabled upon restart
sed -i "/'maintenance'/s/true/false/" "$NCPATH/config/config.php"

# Veracrypt entries
AUTOMOUNT
fi

# Write to file
cat << AUTOMOUNT >> "$SCRIPTS/veracrypt-automount.sh"
if ! echo '$PASSWORD' | veracrypt -t -k "" --pim=0 --protect-hidden=no \
--fs-options=windows_names,uid=www-data,gid=www-data,umask=007 \
"/dev/disk/by-partuuid/$PARTUUID" "$MOUNT_PATH"
then
    sed -i "/'maintenance'/s/false/true/" "$NCPATH/config/config.php"
    source /var/scripts/fetch_lib.sh
    nextcloud_occ_no_check maintenance:mode --on
    send_mail "$MOUNT_PATH could not get mounted!" "Please connect the drive and reboot your server! \
The maintenance mode was activated to prevent any issue with Nextcloud. \
A reboot should fix the issue if the drive is successfully connected again."
fi
AUTOMOUNT

# Secure the file
chown root:root "$SCRIPTS/veracrypt-automount.sh"
chmod 700 "$SCRIPTS/veracrypt-automount.sh"

# Test if drive is connected
cat << CONNECTED > "$SCRIPTS/is-drive-connected.sh"
#!/bin/bash

# Secure the file
chown root:root "$SCRIPTS/is-drive-connected.sh"
chmod 700 "$SCRIPTS/is-drive-connected.sh"

# Entries
PARTUUID="\$1"

# Test if drive is connected 
while lsblk "/dev/disk/by-partuuid/\$PARTUUID" &>/dev/null
do
    sleep 1
done

# Continue if not
if grep -q "'maintenance'" "$NCPATH/config/config.php"
then
    sed -i "/'maintenance'/s/false/true/" "$NCPATH/config/config.php"
    source /var/scripts/fetch_lib.sh
else
    source /var/scripts/fetch_lib.sh
    nextcloud_occ_no_check maintenance:mode --on
fi
send_mail "One veracrypt drive is not connected anymore!" "Please connect the drive and reboot your server!
The maintenance mode was activated to prevent any issue with Nextcloud. 
You can disable it after the drive is successfully mounted again!"
CONNECTED

# Secure the file
chown root:root "$SCRIPTS/is-drive-connected.sh"
chmod 700 "$SCRIPTS/is-drive-connected.sh"

# Create crontab and start
crontab -u root -l | { cat; echo "@reboot $SCRIPTS/is-drive-connected.sh '$PARTUUID' >/dev/null"; } | crontab -u root -
nohup bash "$SCRIPTS/is-drive-connected.sh" "$PARTUUID" &>/dev/null &

# Delete crontab
crontab -u root -l | grep -v 'veracrypt-automount.sh'  | crontab -u root -
# Create service instead
cat << SERVICE > /etc/systemd/system/veracrypt-automount.service
[Unit]
Description=Mount Veracrypt Devices
After=boot.mount
Before=network.target

[Service]
Type=forking
ExecStart=-/bin/bash $SCRIPTS/veracrypt-automount.sh
TimeoutStopSec=1

[Install]
WantedBy=multi-user.target
SERVICE
systemctl disable veracrypt-automount &>/dev/null
systemctl enable veracrypt-automount

# Inform the user
msg_box "Congratulations! The mount was successful.
You can now access the partition here:
$MOUNT_PATH"

# Test if Plex is installed
if is_docker_running && docker ps -a --format "{{.Names}}" | grep -q "^plex$"
then
    # Reconfiguring Plex
    msg_box "Plex Media Server found. We are now adjusting Plex to be able to use the new drive.
This can take a while. Please be patient!"
    print_text_in_color "$ICyan" "Downloading the needed tool to get the current Plex config..."
    docker pull assaflavie/runlike
    echo '#/bin/bash' > /tmp/pms-conf
    docker run --rm -v /var/run/docker.sock:/var/run/docker.sock assaflavie/runlike -p plex >> /tmp/pms-conf
    if ! grep -q "$MOUNT_PATH:$MOUNT_PATH:ro" /tmp/pms-conf
    then
        MOUNT_PATH_SED="${MOUNT_PATH//\//\\/}"
        sed -i "0,/--volume/s// -v $MOUNT_PATH_SED:$MOUNT_PATH_SED:ro \\\\\n&/" /tmp/pms-conf
        docker stop plex
        if ! docker rm plex
        then
            msg_box "Something failed while removing the old container."
            exit 1
        fi
        if ! bash /tmp/pms-conf
        then
            msg_box "Starting the new container failed. You can find the config here: '/tmp/pms-conf'"
            exit 1
        fi
        rm /tmp/pms-conf
        msg_box "Plex was adjusted!"
    else
        rm /tmp/pms-conf
        msg_box "No need to update Plex, since the drive is already mounted to Plex."
    fi
fi

exit