Create AWS Token when using MFA

aws-update-tokens-mfa.sh

#!/usr/bin/env bash

set -e

if [[ -z $AWS_MFA_DEVICE ]]; then
	MFA_DEVICE=${1}
	MFA_TOKEN=$2
else
	MFA_DEVICE=${AWS_MFA_DEVICE}
	MFA_TOKEN=${1}
fi 

if [[ -z $MFA_DEVICE ]]; then
        read -p "Enter MFA Device serial number:" MFA_DEVICE
fi

if [[ -z $MFA_TOKEN ]]; then
	read -p "Enter MFA token:" MFA_TOKEN
fi

getJSONValue() {
	HAYSTACK=$1
	KEY=$2

	VALUE=`echo "$HAYSTACK" | grep $KEY | awk '{print $2}' | sed -e 's/^"//' -e 's/",$//' -e 's/"$//'`
	echo $VALUE
}

# fetch temp token from AWS
TOKENS=`aws sts get-session-token --serial-number ${MFA_DEVICE} --token-code ${MFA_TOKEN}`

ACCESS_KEY_ID=`getJSONValue "$TOKENS" "AccessKeyId"`
SECRET_ACCESS_KEY=`getJSONValue "$TOKENS" "SecretAccessKey"`
SESSION_TOKEN=`getJSONValue "$TOKENS" "SessionToken"`

echo -e """
export AWS_ACCESS_KEY_ID=\"$ACCESS_KEY_ID\"
export AWS_SECRET_ACCESS_KEY=\"$SECRET_ACCESS_KEY\"
export AWS_SESSION_TOKEN=\"$SESSION_TOKEN\"
"""