get-metadata

#!/bin/bash
# Taken from https://gist.github.com/xuwang/c42a77e9f833d263d040. Replaced some grep with jq.

info=${1^^}
meta_data_url=http://instance-data/latest/meta-data/
roleProfile=$(curl -s http://instance-data/latest/meta-data/iam/info | jq -r '.InstanceProfileArn' | awk -F'/' '{print $NF}')
export AWS_DEFAULT_REGION=$(curl -s http://instance-data/latest/dynamic/instance-identity/document | jq --raw-output .region)

# auth values
get_sts_value() {
  echo -n $(curl -s http://instance-data/latest/meta-data/iam/security-credentials/$roleProfile/ \
      | grep "$1" \
      | awk -F":" '{print $2}' \
      | sed 's/^[ ^t]*//;s/"//g;s/,//g')
}

# exit 1 with an error message
abort(){
    echo $1
    exit 1
}

# get ASG name and instance public IPs
asg_public_ips(){
    instance_id=$(curl -s http://instance-data/latest/meta-data/instance-id)
    asg_name=$(aws autoscaling describe-auto-scaling-groups \
        | jq -r ".[] | map(select(.Instances[].InstanceId | contains(\"$instance_id\"))) | .[].AutoScalingGroupName")
    if [[  "$asg_name" ]]; then
        asg_ips=$(aws ec2 describe-instances --instance-ids $(aws autoscaling describe-auto-scaling-groups --auto-scaling-group-name "$asg_name" \
            | jq '.AutoScalingGroups[0].Instances[] | select(.LifecycleState  == "InService") | .InstanceId' \
            | xargs) \
            | jq -r ".Reservations[].Instances[].PublicIpAddress")
        result=$(echo $asg_name: $asg_ips)
    else
        abort "$instance_id doesn't belong to autoscaling group."
    fi
}

asg_private_ips(){
    instance_id=$(curl -s http://instance-data/latest/meta-data/instance-id)
    asg_name=$(aws autoscaling describe-auto-scaling-groups \
        | jq -r ".[] | map(select(.Instances[].InstanceId | contains(\"$instance_id\"))) | .[].AutoScalingGroupName")
    if [[  "$asg_name" ]]; then
        asg_ips=$(aws ec2 describe-instances --instance-ids $(aws autoscaling describe-auto-scaling-groups --auto-scaling-group-name "$asg_name" \
            | jq '.AutoScalingGroups[0].Instances[] | select(.LifecycleState  == "InService") | .InstanceId' \
            | xargs) \
            | jq -r ".Reservations[].Instances[].PrivateIpAddress")
        result=$(echo $asg_name: $asg_ips)
    else
        abort "$instance_id doesn't belong to autoscaling group."
    fi
}

case $info in
    ASGIPS|ASGIPSPUB)
        asg_public_ips
        ;;
    ASGIPSPRV)
        asg_private_ips
        ;;
    ACCOUNT)
        result=$(curl -s http://instance-data/latest/dynamic/instance-identity/document | jq .accountId | sed 's/"//g')
        ;;
    HOSTNAME)
        result=$(curl -s http://instance-data/latest/meta-data/public-hostname)
        ;;
    ID|INSTANCEID)
        result=$(curl -s http://instance-data/latest/meta-data/instance-id)
        ;;
    PRIVATEIP)
        result=$(curl -s http://instance-data/latest/meta-data/local-ipv4)
        ;;
    PUBLICIP)
        result=$(curl -s http://instance-data/latest/meta-data/public-ipv4)
        ;;
    ROLE)
        result=$roleProfile
        ;;
    STSCRED)
        result=$(curl -s http://instance-data/latest/meta-data/iam/security-credentials/$roleProfile)
        ;;
    STSTOKEN)
	    result=$(get_sts_value "Token")
        ;;
    STSKEY)
        result=$(get_sts_value "AccessKeyId")
        ;;
    S3SECRET)
        result=$(get_sts_value "SecretAccessKey")
        ;;
    ZONE)
	    result=$(curl -s http://instance-data/latest/meta-data/placement/availability-zone/ | sed -e 's/.$//')
        ;;
    *)
        echo "Usage: $(basename $0) <argument>"
        grep -Eo '([A-Z.]+\))' $0 | sed 's/)//'
   	;;
esac

if [ ! -z "$result" ]; then
    echo "$result"
fi