class Openssl < Formula
  desc "OpenSSL SSL/TLS cryptography library"
  homepage "https://openssl.org/"
  url "https://www.openssl.org/source/openssl-1.0.2d.tar.gz"
  mirror "https://dl.bintray.com/homebrew/mirror/openssl-1.0.2d.tar.gz"
  mirror "https://www.mirrorservice.org/sites/ftp.openssl.org/source/openssl-1.0.2d.tar.gz"
  sha256 "671c36487785628a703374c652ad2cebea45fa920ae5681515df25d9f2c9a8c8"
  revision 1

  bottle do
    sha256 "b0d8d2082ec30add6327f50ade554a9d45c09ef04b9086a4b779bb7d5816794b" => :el_capitan
    sha256 "65de00409343fb371a065ae514da7a6cbf4f575dee9e0016bd22baccd5b644fa" => :yosemite
    sha256 "ec0a2591aca21c855790464f691db864d5180cb8ae97c68429ca31560fd5fd29" => :mavericks
    sha256 "cc001abc92c0991bef7817cd88c078f8110354d1529a194a4b2e16e5e09cbeca" => :mountain_lion
  end

  option :universal
  option "without-check", "Skip build-time tests (not recommended)"

  depends_on "makedepend" => :build

  keg_only :provided_by_osx,
    "Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries"

  def arch_args
    {
      :x86_64 => %w[darwin64-x86_64-cc enable-ec_nistp_64_gcc_128],
      :i386   => %w[darwin-i386-cc]
    }
  end

  def configure_args; %W[
    --prefix=#{prefix}
    --openssldir=#{openssldir}
    no-ssl2
    zlib-dynamic
    shared
    enable-cms
  ]
  end

  def install
    if build.universal?
      ENV.permit_arch_flags
      archs = Hardware::CPU.universal_archs
    elsif MacOS.prefer_64_bit?
      archs = [Hardware::CPU.arch_64_bit]
    else
      archs = [Hardware::CPU.arch_32_bit]
    end

    dirs = []

    archs.each do |arch|
      if build.universal?
        dir = "build-#{arch}"
        dirs << dir
        mkdir dir
        mkdir "#{dir}/engines"
        system "make", "clean"
      end

      ENV.deparallelize
      system "perl", "./Configure", *(configure_args + arch_args[arch])
      system "make", "depend"
      system "make"

      if (MacOS.prefer_64_bit? || arch == MacOS.preferred_arch) && build.with?("check")
        system "make", "test"
      end

      if build.universal?
        cp Dir["*.?.?.?.dylib", "*.a", "apps/openssl"], dir
        cp Dir["engines/**/*.dylib"], "#{dir}/engines"
      end
    end

    system "make", "install", "MANDIR=#{man}", "MANSUFFIX=ssl"

    if build.universal?
      %w[libcrypto libssl].each do |libname|
        system "lipo", "-create", "#{dirs.first}/#{libname}.1.0.0.dylib",
                                  "#{dirs.last}/#{libname}.1.0.0.dylib",
                       "-output", "#{lib}/#{libname}.1.0.0.dylib"
        system "lipo", "-create", "#{dirs.first}/#{libname}.a",
                                  "#{dirs.last}/#{libname}.a",
                       "-output", "#{lib}/#{libname}.a"
      end

      Dir.glob("#{dirs.first}/engines/*.dylib") do |engine|
        libname = File.basename(engine)
        system "lipo", "-create", "#{dirs.first}/engines/#{libname}",
                                  "#{dirs.last}/engines/#{libname}",
                       "-output", "#{lib}/engines/#{libname}"
      end

      system "lipo", "-create", "#{dirs.first}/openssl",
                                "#{dirs.last}/openssl",
                     "-output", "#{bin}/openssl"
    end
  end

  def openssldir
    etc/"openssl"
  end

  def post_install
    keychains = %w[
      /Library/Keychains/System.keychain
      /System/Library/Keychains/SystemRootCertificates.keychain
    ]

    certs_list = `security find-certificate -a -p #{keychains.join(" ")}`
    certs = certs_list.scan(
      /-----BEGIN CERTIFICATE-----.*?-----END CERTIFICATE-----/m
    )

    valid_certs = certs.select do |cert|
      IO.popen("openssl x509 -inform pem -checkend 0 -noout", "w") do |openssl_io|
        openssl_io.write(cert)
        openssl_io.close_write
      end

      $?.success?
    end

    openssldir.mkpath
    (openssldir/"cert.pem").atomic_write(valid_certs.join("\n"))
  end

  def caveats; <<-EOS.undent
    A CA file has been bootstrapped using certificates from the system
    keychain. To add additional certificates, place .pem files in
      #{openssldir}/certs

    and run
      #{opt_bin}/c_rehash
    EOS
  end

  test do
    # Make sure the necessary .cnf file exists, otherwise OpenSSL gets moody.
    assert (HOMEBREW_PREFIX/"etc/openssl/openssl.cnf").exist?,
            "OpenSSL requires the .cnf file for some functionality"

    # Check OpenSSL itself functions as expected.
    (testpath/"testfile.txt").write("This is a test file")
    expected_checksum = "e2d0fe1585a63ec6009c8016ff8dda8b17719a637405a4e23c0ff81339148249"
    system "#{bin}/openssl", "dgst", "-sha256", "-out", "checksum.txt", "testfile.txt"
    open("checksum.txt") do |f|
      checksum = f.read(100).split("=").last.strip
      assert_equal checksum, expected_checksum
    end
  end
end