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class OpensslAT10 < Formula
  desc "SSL/TLS cryptography library"
  homepage "https://openssl.org/"
  url "https://ftp.openssl.org/source/old/1.0.2/openssl-1.0.2u.tar.gz"
  mirror "http://artfiles.org/openssl.org/source/old/1.0.2/openssl-1.0.2u.tar.gz"
  sha256 "ecd0c6ffb493dd06707d38b14bb4d8c2288bb7033735606569d8f90f89669d16"

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

  def install
    # OpenSSL will prefer the PERL environment variable if set over $PATH
    # which can cause some odd edge cases & isn't intended. Unset for safety,
    # along with perl modules in PERL5LIB.
    ENV.delete("PERL")
    ENV.delete("PERL5LIB")

    ENV.deparallelize
    args = %W[
      --prefix=#{prefix}
      --openssldir=#{openssldir}
      no-ssl2
      no-ssl3
      no-zlib
      shared
      enable-cms
      darwin64-x86_64-cc
      enable-ec_nistp_64_gcc_128
    ]
    system "perl", "./Configure", *args
    system "make", "depend"
    system "make"
    system "make", "test"
    system "make", "install", "MANDIR=#{man}", "MANSUFFIX=ssl"
  end

  def openssldir
    etc/"openssl"
  end

  def post_install
    keychains = %w[
      /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("#{bin}/openssl x509 -inform pem -checkend 0 -noout", "w") do |openssl_io|
        openssl_io.write(cert)
        openssl_io.close_write
      end

      $CHILD_STATUS.success?
    end

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

  def caveats; <<~EOS
    A CA file has been bootstrapped using certificates from the SystemRoots
    keychain. To add additional certificates (e.g. the certificates added in
    the System keychain), 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_predicate 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