#!/bin/bash
# info: add backup host
# options: TYPE HOST USERNAME PASSWORD [PATH] [PORT]
#
# This function adds a backup host


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

# Argument definition
type=$1
host=$2
user=$3
password=$4; HIDE=4
path=${5-/backup}
port=$6

# Includes
source $VESTA/func/main.sh
source $VESTA/conf/vesta.conf

# Defining ftp command function
ftpc() {
    ftp -p -n $host $port <<EOF
    quote USER $user
    quote PASS $password
    binary
    $1
    $2
    $3
    quit
EOF
}

# Defining sftp command function
sftpc() {
    expect -f "-" <<EOF "$@"
        set count 0
        spawn "/usr/bin/sftp -o StrictHostKeyChecking=no -o \
            Port=$port '$user@$host'"
        expect {
            "password:" {
                send "$password\r"
                exp_continue
            }

            -re "Couldn't|(.*)disconnect|(.*)stalled|(.*)not found" {
                set count \$argc
                set output "Disconnected."
                set rc $E_FTP
                exp_continue
            }

            -re ".*denied.*(publickey|password)." {
                set output "Permission denied, wrong publickey or password."
                set rc $E_CONNECT
            }

            "sftp>" {
                if {\$count < \$argc} {
                    set arg [lindex \$argv \$count]
                    send "\$arg\r"
                    incr count
                } else {
                    send "exit\r"
                    set output "Disconnected."
                    if {[info exists rc] != 1} {
                        set rc $OK
                    }
                }
                exp_continue
            }

            timeout {
                set output "Connection timeout."
                set rc $E_CONNECT
            }
        }

        if {[info exists output] == 1} {
            puts "\$output"
        }

        exit \$rc
EOF
}


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

if [ "$type" != 'local' ];then
    check_args '4' "$#" "TYPE HOST USERNAME PASSWORD [PATH] [PORT]"
    is_format_valid 'user' 'host' 'path' 'port'
    is_password_valid
    if [ "$type" = 'sftp' ]; then
        which expect >/dev/null 2>&1
        check_result $? "expect command not found"  $E_NOTEXIST
    fi
    host "$host" >/dev/null 2>&1
    check_result $? "host connection failed" "$E_CONNECT"
fi


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

# Checking network connection
if [ "$type" = 'ftp' ]; then
    if [ -z $port ]; then
        port=21
    fi
    fconn=$(ftpc 2>&1)
    ferror=$(echo $fconn |\
        grep -i -e failed -e error -e "can't" -e "not conn" -e "incorrect")
    if [ ! -z "$ferror" ]; then
        echo "Error: can't login to ftp $user@$host"
        log_event "$E_CONNECT" "$ARGUMENTS"
        exit $E_CONNECT
    fi

    # Checking write permissions
    if [ -z $path ]; then
        ftmpdir="vst.bK76A9SUkt"
    else
        ftpc "mkdir $path" > /dev/null 2>&1
        ftmpdir="$path/vst.bK76A9SUkt"
    fi
    ftp_result=$(ftpc "mkdir $ftmpdir" "rm $ftmpdir"|grep -v Trying)
    if [ ! -z "$ftp_result" ] ; then
        echo "$ftp_result"
        rm -rf $tmpdir
        echo "Error: can't create $ftmpdir folder on the ftp"
        log_event "$E_FTP" "$ARGUMENTS"
        exit $E_FTP
    fi
fi
if [ "$type" = 'sftp' ]; then
    if [ -z $port ]; then
        port=22
    fi
    if [ -z $path ]; then
            sftmpdir="vst.bK76A9SUkt"
            sftpc "mkdir $sftmpdir" "rmdir $sftmpdir" > /dev/null 2>&1
    else
        if sftpc "mkdir $path" > /dev/null 2>&1 ; then
            sftmpdir="$path/vst.bK76A9SUkt"
            sftpc "mkdir $sftmpdir" "rmdir $sftmpdir" > /dev/null 2>&1
        else
            sftmpdir="$path/vst.bK76A9SUkt"
            sftpc "mkdir $sftmpdir" "rmdir $sftmpdir" > /dev/null 2>&1
        fi
    fi
    rc=$?
    if [[ "$rc" != 0 ]]; then
        case $rc in
            $E_CONNECT) echo "Error: can't login to sftp $user@$host";;
            $E_FTP) echo "Error: can't create temp folder on the sftp host";;
        esac
        log_event "$rc" "$ARGUMENTS"
        exit "$rc"
    fi
fi


# Adding backup host
if [ $type != 'local' ]; then
    time_n_date=$(date +'%T %F')
    time=$(echo "$time_n_date" |cut -f 1 -d \ )
    date=$(echo "$time_n_date" |cut -f 2 -d \ )
    str="HOST='$host'\nUSERNAME='$user'\nPASSWORD='$password'"
    str="$str\nBPATH='$path'\nPORT='$port'\nTIME='$time'\nDATE='$date'"
    echo -e "$str" > $VESTA/conf/$type.backup.conf
    chmod 660 $VESTA/conf/$type.backup.conf
fi


#----------------------------------------------------------#
#                       Vesta                              #
#----------------------------------------------------------#

# Update vesta.conf
if [ -z "$(grep BACKUP_SYSTEM $VESTA/conf/vesta.conf)" ]; then
    echo "BACKUP_SYSTEM='$type'" >> $VESTA/conf/vesta.conf
else
    bckp=$(echo "$BACKUP_SYSTEM,$type" |\
        sed "s/,/\n/g"|\
        sort -r -u |\
        sed "/^$/d"|\
        sed ':a;N;$!ba;s/\n/,/g')
    sed -i "s/BACKUP_SYSTEM=.*/BACKUP_SYSTEM='$bckp'/g" $VESTA/conf/vesta.conf
fi

# Logging
log_event "$OK" "$ARGUMENTS"

exit
