#!/bin/bash
# info: add user sftp key
# options: USER [TTL]
#
# The script creates and updates ssh key for filemanager usage


#----------------------------------------------------------#
#                    Variable&Function                     #
#----------------------------------------------------------#

# Argument definition
user=$1
ttl=$2

# Includes
source $HESTIA/func/main.sh
source $HESTIA/conf/hestia.conf


#----------------------------------------------------------#
#                    Verifications                         #
#----------------------------------------------------------#

check_args '1' "$#" 'USER [TTL]'
is_format_valid 'user' 'ttl'
is_object_valid 'user' 'USER' "$user"


#----------------------------------------------------------#
#                       Action                             #
#----------------------------------------------------------#

PRVKEY_FILE="$HOMEDIR/$user/.ssh/hst-filemanager-key"
PUBKEY_FILE="$HOMEDIR/$user/.ssh/hst-filemanager-key.pub"
AUTHKEY_FILE="$HOMEDIR/$user/.ssh/authorized_keys"

[ -z "$(readlink -f "$PRVKEY_FILE"  | egrep "^$HOMEDIR/$user/.ssh/")" ] && check_result $E_FORBIDEN "Invalid private key file path"
[ -z "$(readlink -f "$PUBKEY_FILE"  | egrep "^$HOMEDIR/$user/.ssh/")" ] && check_result $E_FORBIDEN "Invalid public key file path"
[ -z "$(readlink -f "$AUTHKEY_FILE" | egrep "^$HOMEDIR/$user/.ssh/")" ] && check_result $E_FORBIDEN "Invalid authorized keys path"

if [ ! -f "${PRVKEY_FILE}" ]; then

    ssh-keygen -q -b 1024 -t rsa -f "${PRVKEY_FILE}" -N ""
    rm "${PUBKEY_FILE}"
    new_privkey=true

fi

if [ ! -f "${AUTHKEY_FILE}" ] || [ "$new_privkey" = true ]; then

    pubkey_str="$(ssh-keygen -y -f ${PRVKEY_FILE})"
    pubkey_desc="filemanager.ssh.key"

    if grep --quiet --no-messages -F "$pubkey_desc" "${AUTHKEY_FILE}"; then
        sed -i "/filemanager\.ssh\.key\$/d" "${AUTHKEY_FILE}"
    fi

    # make sure authorized_keys is ending with EOL
    [ -f "${AUTHKEY_FILE}" ] && sed -i '$a\' "${AUTHKEY_FILE}"

    expire=0
    if [[ "$ttl" -gt 0 ]]; then
        expire=$(date +%s -d "+${ttl} min")
        echo "rm ${PRVKEY_FILE}" | at "now +${ttl} minute" > /dev/null 2>&1
    fi
    echo "from=\"127.0.0.1\",command=\"internal-sftp\",restrict ${pubkey_str} TS:${expire} ${pubkey_desc}" >> "${AUTHKEY_FILE}"

fi

# 
chown ${user}: "${AUTHKEY_FILE}"
chown admin: "${PRVKEY_FILE}"


#----------------------------------------------------------#
#                       Hestia                             #
#----------------------------------------------------------#

# Logging
log_event "$OK" "$ARGUMENTS"

exit
