#!/bin/bash
set -eo pipefail

help=$(cat <<EOF
Generate Tarball with PSU image and MANIFEST Script
usage: generate-psu-tar [OPTION] <parameter>...
Options:
   --image        <file>          PSU FW image
   --version      <version>       PSU FW version
   --model        <model>         PSU FW model
   --manufacturer <version>       PSU FW manufacturer
   --machineName  <machineName>   Optionally specify the target machine name of this image.
   --outfile      <filename>      Outfile name
		                  For example : -o psufw.tar
                                  The default outfile name is image.tar,and
                                  "image" is what you input.
   --sign         <path>          Sign the image. The optional path argument specifies
                                  the private key file. Defaults to the bash variable
                                  PRIVATE_KEY_PATH if available, or else uses the
                                  open-source private key in this script.
   --help                         Display this help text and exit.
EOF
)

private_key=$'-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----
'

do_sign=false
# shellcheck disable=SC2153
private_key_path="${PRIVATE_KEY_PATH}"
image=""
outfile=""
version=""
model=""
manufacturer=""
machineName=""


while [[ $# -gt 0 ]]; do
  key="$1"
  case $key in
    --image)
      image="$2"
      shift 2
      ;;
    --version)
      version="$2"
      shift 2
      ;;
    --model)
      model="$2"
      shift 2
      ;;
    --manufacturer)
      manufacturer="$2"
      shift 2
      ;;
    --machineName)
      machineName="$2"
      shift 2
      ;;
    --outfile)
      outfile="$2"
      shift 2
      ;;
    --sign)
      do_sign=true
      if [[ -n "${2}"  && "${2}" != -* ]]; then
        private_key_path="$2"
        shift 2
      else
        shift 1
      fi
      ;;
    --help)
      echo "$help"
      exit
      ;;
    *)
      echo "Please enter the correct parameters."
      echo "$help"
      exit 1
      ;;
  esac
done

if [ ! -f "${image}" ]; then
  echo "Please enter a valid PSU FW image file."
  echo "$help"
  exit 1
fi

if [  -z "${version}" ]; then
  echo "Please enter a valid PSU FW image version."
  echo "$help"
  exit 1
fi


if [  -z "${model}" ]; then
  echo "Please enter a valid PSU FW image model."
  echo "$help"
  exit 1
fi

if [  -z "${manufacturer}" ]; then
  echo "Please enter a valid PSU FW image manufacturer."
  echo "$help"
  exit 1
fi

if [  -z "${outfile}" ]; then
    outfile=$(pwd)/$image.tar
else
    outfile=$(pwd)/$outfile
fi

scratch_dir=$(mktemp -d)
# shellcheck disable=SC2064
trap "{ rm -r ${scratch_dir}; }" EXIT

if [[ "${do_sign}" == true ]]; then
  if [[ -z "${private_key_path}" ]]; then
    private_key_path=${scratch_dir}/OpenBMC.priv
    echo "${private_key}" > "${private_key_path}"
    echo "Image is NOT secure!! Signing with the open private key!"
  else
    if [[ ! -f "${private_key_path}" ]]; then
      echo "Couldn't find private key ${private_key_path}."
      exit 1
    fi

    echo "Signing with ${private_key_path}."
  fi

  public_key_file=publickey
  public_key_path=${scratch_dir}/$public_key_file
  openssl pkey -in "${private_key_path}" -pubout -out "${public_key_path}"

  cp "${private_key_path}" "${scratch_dir}/private_key"

fi

manifest_location="MANIFEST"
files_to_sign="$manifest_location $public_key_file $image"

cp "${image}" "${scratch_dir}"
cd "${scratch_dir}"

echo "Creating MANIFEST for the image"
echo -e "purpose=xyz.openbmc_project.Software.Version.VersionPurpose.PSU\nversion=$version\n\
extended_version=model=$model,manufacturer=$manufacturer" > $manifest_location

if [[ -n "${machineName}" ]]; then
    echo -e "MachineName=${machineName}" >> $manifest_location
fi

if [[ "${do_sign}" == true ]]; then
  private_key_name=$(basename "${private_key_path}")
  key_type="${private_key_name%.*}"
  echo KeyType="${key_type}" >> $manifest_location
  echo HashType="RSA-SHA256" >> $manifest_location

  for file in $files_to_sign; do
    openssl dgst -sha256 -sign private_key -out "${file}.sig" "$file"
  done

  additional_files="*.sig"
fi

# shellcheck disable=SC2086
# Do not quote the files variables since they list multiple files
# and tar would assume to be a single file name within quotes
tar -cvf $outfile $files_to_sign $additional_files
echo "PSU FW tarball at $outfile"
exit