{ stdenv, fetchurl, openssl, makeWrapper, buildPythonApplication
, pytest, dns }:

buildPythonApplication rec {
  name = "${pname}-${majorversion}.${minorversion}";
  pname = "dkimpy";
  majorversion = "0.6";
  minorversion = "1";

  src = fetchurl {
    url = "https://launchpad.net/${pname}/${majorversion}/${majorversion}.${minorversion}/+download/${name}.tar.gz";
    sha256 = "0zmvyw18ww1jqrbqws636w3xki59fyqva553r6s74q5c4jvy36v2";
  };

  buildInputs = [ pytest ];
  propagatedBuildInputs =  [ openssl dns ];

  patchPhase = ''substituteInPlace dknewkey.py --replace \
     /usr/bin/openssl ${openssl}/bin/openssl
     '';

  postInstall = ''
    mkdir -p $out/bin $out/libexec
    mv $out/bin/*.py $out/libexec
    makeWrapper "$out/libexec/dkimverify.py" $out/bin/dkimverify
    makeWrapper "$out/libexec/dkimsign.py" $out/bin/dkimsign
    makeWrapper "$out/libexec/arcverify.py" $out/bin/arcverify
    makeWrapper "$out/libexec/arcsign.py" $out/bin/arcsign
    makeWrapper "$out/libexec/dknewkey.py" $out/bin/dknewkey
   '';

  meta = with stdenv.lib; {
    description = "DKIM + ARC email signing/verification tools + Python module";
    longDescription = ''Python module that implements DKIM (DomainKeys Identified Mail)
      email signing and verification. It also provides a number of convєnient tools
      for command line signing and verification, as well as generating new DKIM records.
      This version also supports the experimental Authenticated Received Chain (ARC)
      protocol.
    '';
    homepage = "https://launchpad.net/dkimpy";
    license = licenses.bsd3;
    maintainers = with maintainers; [ leenaars ];
  };
}