pubkey

#!/usr/bin/env bash

set -ue -o pipefail
export LC_ALL=C

DATETIME=`date +"%Y%m%d%H%M%S"`
USER=""

if [ $# -ge 1 ]; then
   case "$1" in
       --help|-h)
           echo "Usage: pubkey [<username> [<url>]]"
           echo ""
           exit 0
           ;;
       *)
           USER=$1
   esac
else
    echo "User name: "
    array=()
    for home in `ls /home`; do
        array+=($home)
        echo -e "\t${#array[@]}) $home"
    done

    read -p "select user number: " NO
    if [ -z "$NO" ]; then
        exit
    fi
    if [ $NO -le ${#array[@]} ]; then
        USER=${array[NO-1]}
    else
        exit 1
    fi
fi

KEYFILE="/home/$USER/.ssh/authorized_keys"
if [ -f $KEYFILE -a -s $KEYFILE ]; then
    awk '{gsub(/^$/,"unknown",$3);print NR, $3}' $KEYFILE

    echo
    echo -e "\t1) add"
    echo -e "\t2) delete"
    read -p "select action number: " NO
    if [ "$NO" = "1" ]; then
        :
    elif [ "$NO" = "2" ]; then
        read -p "delete number: " NO
        cp -a $KEYFILE $KEYFILE.$DATETIME
        sed -i -e "${NO}d" $KEYFILE
        echo ""
        echo "Success!"
        echo -e "\tBackup file: $KEYFILE.$DATETIME"
        exit 0
        :
    else
        exit 0
    fi
fi

cp -a $KEYFILE $KEYFILE.$DATETIME
echo
echo "add public key from url."
if [ $# -ge 2 ]; then
    URL=$2
else
    read -p "URL: " URL
fi

read -p "Comment (whose key is it?): " COMMENT
if [ -z $COMMENT ]; then
    exit 1
fi
echo
echo -e "get public key file from <$URL>\n  and add to $KEYFILE"
echo -e "\tComment: $COMMENT"
echo
echo -e "\t1) OK"
echo -e "\t2) NG"
read -p "OK? :" NO
if [ "$NO" != "1" ]; then
    exit 0
fi

wget $URL -O - | awk "{gsub(/^.*\$/,\"$COMMENT\",\$3);print}" >> $KEYFILE

echo "Success!"
echo -e "\tBackup file: $KEYFILE.$DATETIME"