#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2010-2016, OpenNebula Systems                                    #
#                                                                            #
# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
# not use this file except in compliance with the License. You may obtain    #
# a copy of the License at                                                   #
#                                                                            #
# http://www.apache.org/licenses/LICENSE-2.0                                 #
#                                                                            #
# Unless required by applicable law or agreed to in writing, software        #
# distributed under the License is distributed on an "AS IS" BASIS,          #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
# See the License for the specific language governing permissions and        #
# limitations under the License.                                             #
#--------------------------------------------------------------------------- #

[ -z "${SSH_PUBLIC_KEY}${EC2_PUBLIC_KEY}" ] && exit 0

if [ -z "${USERNAME}" ]
then
    USERNAME=root
fi

# Get user $HOME directory
USER_HOME=$(getent passwd "${USERNAME}" | awk -F':' '{print $6}')

if [ -n "${USER_HOME}" ]
then
    AUTH_DIR="${USER_HOME}/.ssh"
else
    # Fallback on root
    AUTH_DIR="/root/.ssh"
fi

AUTH_FILE="$AUTH_DIR/authorized_keys"

function add_keys {
    while read key; do
        if ! grep -q -F "$key" $AUTH_FILE; then
            echo "$key" >> $AUTH_FILE
        fi
    done
}

[ -z "${SSH_PUBLIC_KEY}${EC2_PUBLIC_KEY}" ] && exit 0

mkdir -m0700 -p $AUTH_DIR

[ ! -f $AUTH_FILE ] && touch $AUTH_FILE

if [ -n "$SSH_PUBLIC_KEY" ]; then
    echo "$SSH_PUBLIC_KEY" | add_keys
fi

if [ -n "$EC2_PUBLIC_KEY" ]; then
    echo "$EC2_PUBLIC_KEY" | add_keys
fi

chown "${USERNAME}": ${AUTH_DIR} ${AUTH_FILE}
chmod 600 $AUTH_FILE