#!/bin/sh

# Acknowledgements:
# - Eric Hameleers (AlienBOB) - https://alien.slackbook.org/

set -e

retrieve() {
  mkdir -p tmp

  printf "Downloading 'versions.txt'...\n"
  # Each zip contains a CDM binary, manifest.json file, and LICENSE.txt file.
  # Current version can be read online (last line):
  # https://dl.google.com/widevine-cdm/versions.txt
  if [ ! -f "tmp/versions.txt" ]; then
    curl --fail -o "tmp/versions.txt" \
      "https://dl.google.com/widevine-cdm/versions.txt"
  fi

  # Set the latest version if not otherwise stated (last entry in the txt)
  pkgver="${pkgver:-$(tail --quiet -n1 "tmp/versions.txt")}"

  printf "Downloading '%s'...\n" "${pkgver}-linux-${pkgarch}.zip"
  # The place where Mozilla Firefox downloads these ZIP files is documented here:
  # https://github.com/mozilla/gecko-dev/blob/master/toolkit/content/gmp-sources/widevinecdm.json
  if [ ! -f "tmp/${pkgver}-linux-${pkgarch}.zip" ]; then
    curl --fail -o "tmp/${pkgver}-linux-${pkgarch}.zip" \
      "https://dl.google.com/widevine-cdm/${pkgver}-linux-${pkgarch}.zip"
  fi
}

prepare() {

  # Test archve files
  unzip -t "tmp/${pkgver}-linux-${pkgarch}.zip"

  mkdir tmp/archive

  unzip "tmp/${pkgver}-linux-${pkgarch}.zip" -d "tmp/archive/." 2>/dev/null

  # Prepare the final dirtree structure, ready to be packaged
  mkdir "${pkgdir}"

  install -D -m755 "tmp/archive/libwidevinecdm.so" \
    "${pkgdir}/usr/lib/chromium/WidevineCdm/_platform_specific/linux_${pkgarch}/libwidevinecdm.so"
  # The manifest.json file is now used by Chromium to determine the features
  # that are supported by the Widevine CDM:
  install -m644 "tmp/archive/manifest.json" \
    "${pkgdir}/usr/lib/chromium/WidevineCdm/"

  # Enable for chromium
  ln -sr "${pkgdir}/usr/lib/chromium/WidevineCdm/_platform_specific/linux_${pkgarch}/libwidevinecdm.so" \
    "${pkgdir}/usr/lib/chromium/libwidevinecdm.so"
  # Enable for chromium-ungoogled
  install -d "${pkgdir}/usr/lib/chromium-ungoogled/"
  ln -sr "${pkgdir}/usr/lib/chromium/WidevineCdm" \
    "${pkgdir}/usr/lib/chromium-ungoogled/WidevineCdm"
  ln -sr "${pkgdir}/usr/lib/chromium/WidevineCdm/_platform_specific/linux_${pkgarch}/libwidevinecdm.so" \
    "${pkgdir}/usr/lib/chromium-ungoogled/libwidevinecdm.so"

  sed -i '1s/^/Copyright 2022 Google Inc. <widevine@google.com>\n\n/' "tmp/archive/LICENSE.txt"

  # Update the license in case it changes
  if ! cmp --silent "debian/copyright" "tmp/archive/LICENSE.txt"; then
    cp "tmp/archive/LICENSE.txt" "debian/copyright"
  fi

  # Update the changelog
  dch \
    --newversion "${pkgver}" \
    --distribution unstable \
    --controlmaint "New release."

}

#pkgver=4.10.2449.0
pkgarch=x64
pkgdir="tree"

retrieve
prepare

dpkg-buildpackage