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{ config, lib, pkgs, ... }:

with lib;

let

  caCertificates = pkgs.runCommand "ca-certificates.crt"
    { files =
        config.security.pki.certificateFiles ++
        [ (builtins.toFile "extra.crt" (concatStringsSep "\n" config.security.pki.certificates)) ];
     }
    ''
      cat $files > $out
    '';

in

{

  options = {

    security.pki.certificateFiles = mkOption {
      type = types.listOf types.path;
      default = [];
      example = literalExample "[ \"\${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt\" ]";
      description = ''
        A list of files containing trusted root certificates in PEM
        format. These are concatenated to form
        <filename>/etc/ssl/certs/ca-certificates.crt</filename>, which is
        used by many programs that use OpenSSL, such as
        <command>curl</command> and <command>git</command>.
      '';
    };

    security.pki.certificates = mkOption {
      type = types.listOf types.str;
      default = [];
      example = literalExample ''
        [ '''
            NixOS.org
            =========
            -----BEGIN CERTIFICATE-----
            MIIGUDCCBTigAwIBAgIDD8KWMA0GCSqGSIb3DQEBBQUAMIGMMQswCQYDVQQGEwJJ
            TDEWMBQGA1UEChMNU3RhcnRDb20gTHRkLjErMCkGA1UECxMiU2VjdXJlIERpZ2l0
            ...
            -----END CERTIFICATE-----
          '''
        ]
      '';
      description = ''
        A list of trusted root certificates in PEM format.
      '';
    };

  };

  config = {

    security.pki.certificateFiles = [ "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt" ];

    # NixOS canonical location + Debian/Ubuntu/Arch/Gentoo compatibility.
    environment.etc."ssl/certs/ca-certificates.crt".source = caCertificates;

    # Old NixOS compatibility.
    environment.etc."ssl/certs/ca-bundle.crt".source = caCertificates;

    # CentOS/Fedora compatibility.
    environment.etc."pki/tls/certs/ca-bundle.crt".source = caCertificates;

  };

}