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#!/usr/bin/env bash

# Wrapper MySQL Client for IAM Based Authentication for MySQL and Amazon Aurora on RDS
# Read: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.IAMDBAuth.html
# Usage: [app] [aws_profile] [rds_endpoint] [rds_mysql_username]

command_exists() {
  type "$1" &> /dev/null ;
}

check_required_parameters() {
  aws_profile="$1"
  rds_hostname="$2"
  rds_username="$3"
  if ! [[ -n "$aws_profile" && -n "$rds_username" && -n "$rds_username" ]]
    then
      echo "Error: Missing Parameters"
      echo "Expected: $0 aws_profile_name rds_endpoint_name rds_db_username"
      echo "Usage: $0 prod dbname.eu-west-1.amazonaws.com dba"
      exit 1
  fi
}

get_auth_token() {
  aws_bin=$(which aws | head -1)
  auth_token="$($aws_bin --profile $aws_profile rds generate-db-auth-token --hostname $rds_hostname --port 3306 --username $rds_username )"
}

connect_to_rds() {
  mysql_bin=$(which mysql | head -1)
  $mysql_bin --host=$rds_hostname --port=3306 --enable-cleartext-plugin --user=$rds_username --password=$auth_token
}

if [ "$1" == "help" ] 
  then
    echo "Help"
    echo "Expected: $0 aws_profile_name rds_endpoint_name rds_db_username"
    echo "Usage: $0 prod dbname.eu-west-1.amazonaws.com dba_user"
    exit 0
fi

if command_exists aws && command_exists mysql 
then
  check_required_parameters $1 $2 $3
  get_auth_token
  connect_to_rds
else
  echo "Error: Make sure aws-cli and mysql client is installed"
fi