#!/bin/bash
set -ex
THIS_DIR=$( cd "$( dirname "${BASH_SOURCE[0]:-${(%):-%x}}" )" && pwd )

touch_user() {
    test -n "$1"
    if id -u $1 1>/dev/null 2>&1; then
        return
    fi
    if ! id -g nasp 1>/dev/null 2>&1; then
        echo "Group 'nasp' does not exist\!"
        exit 1
    fi

    adduser \
        --shell /bin/bash \
        --disabled-password \
        --home /home/$1 \
        $1
    usermod -a -G nasp $1
}

update_key() {
    tmp_path="/tmp/authorized_keys_$1"
    dest_path="/home/$1/.ssh/authorized_keys"
    echo "# This file is autoly generated. Changes here will not work." > "$tmp_path"

    for file in $(find "$THIS_DIR/../authorized_keys/$1" -type f); do
        (echo "# key file: ${file#*authorized_keys/}";cat "$file"; echo) >> "$tmp_path"
    done

    cat "$tmp_path" > "$dest_path"
    rm "$tmp_path"
    chown $1:$1 "$dest_path"
    chmod 600 "$dest_path"
}

main() {
    for file in "$THIS_DIR"/../authorized_keys/* ; do
        if ! test -d "$file"; then
            continue
        fi
        username=$(basename $file)
        touch_user $username
        update_key $username
    done
}

main