entrypoint.sh

#!/bin/bash

set -e

if [[ -z "$AWS_REGION" ]] || [[ -z "$AWS_ACCESS_KEY_ID" ]] || [[ -z "$AWS_SECRET_ACCESS_KEY" ]]; then
  echo "Ensure that all environmental variables (AWS_REGION, AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY) are set!"
  exit 1
fi

if [[ -z "$INPUT_SSM_PARAMETER_LIST" ]]; then
  echo "Set SSM parameter name list (parameter_name_list) value(s)."
  exit 1
fi

region="$AWS_REGION"
parameter_name_list="$INPUT_SSM_PARAMETER_LIST"
prefix="$INPUT_PREFIX"
ssm_start_prefix="$INPUT_SSM_START_PREFIX"
jq_filter="$INPUT_JQ_FILTER"
simple_json="$INPUT_SIMPLE_JSON"

format_var_name () {
  echo "$1" | awk -v prefix="$prefix" -F. '{print prefix $NF}' | tr "[:lower:]" "[:upper:]"
}

get_ssm_param() {
  parameter_name="$1"
  ssm_param=$(aws --region "$region" ssm get-parameter --name "$parameter_name")
  if [ -n "$jq_filter" ] || [ -n "$simple_json" ]; then
    ssm_param_value=$(echo "$ssm_param" | jq '.Parameter.Value | fromjson')
    if [ -n "$simple_json" ] && [ "$simple_json" == "true" ]; then
      for p in $(echo "$ssm_param_value" | jq -r --arg v "$prefix" 'to_entries|map("\(.key)=\(.value|tostring)")|.[]' ); do
        IFS='=' read -r var_name var_value <<< "$p"
        echo "$(format_var_name "$var_name")=$var_value" >> $GITHUB_ENV
      done
    else
      IFS=' ' read -r -a params <<< "$jq_filter"
      for var_name in "${params[@]}"; do
        var_value=$(echo "$ssm_param_value" | jq -r -c "$var_name")
        echo "$(format_var_name "$var_name")=$var_value" >> $GITHUB_ENV
      done
    fi
  else
    var_name=$(echo "$ssm_param" | jq -r '.Parameter.Name' | awk -F/ '{print $NF}')
    var_value=$(echo "$ssm_param" | jq -r '.Parameter.Value')
    if [ -n "$ssm_start_prefix" ]; then
      var_name=${var_name:${#ssm_start_prefix}}
    fi
    echo "$(format_var_name "$var_name")=$var_value" >> $GITHUB_ENV
  fi
}

for parameter in $(echo $parameter_name_list | sed "s/,/ /g"); do
  if [ -n "$ssm_start_prefix" ]; then
    get_ssm_param "$ssm_start_prefix$parameter"
  else
    get_ssm_param "$parameter"
  fi
done