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  $self = $self->new($arg) if $arg;

  if ($arg->{dry_run}) {
    require Data::Dumper;
    $self->log("By request, cowardly refusing to do anything at all.");
    $self->log(
      "The following arguments would have been used to upload: \n"
      . '$self: ' . Data::Dumper::Dumper($self)
      . '$file: ' . Data::Dumper::Dumper($file)
    );
  } else {
    $self->_upload($file);
  }
}

sub _ua_string {
  my ($self) = @_;
  my $class   = ref $self || $self;
  my $version = defined $class->VERSION ? $class->VERSION : 'dev';

  return "$class/$version";
}

sub target { shift->{target} || 'PAUSE' }

sub _upload {
  my $self = shift;
  my $file = shift;

  $self->log("registering upload with " . $self->target . " web server");

  my $agent = HTTP::Tiny::UA->new(
    agent => $self->_ua_string,
    ($self->{http_proxy} ? (http_proxy => $self->{http_proxy}) : ()),
  );

  my $uri = URI->new($self->{upload_uri} || $UPLOAD_URI);
  $uri->userinfo(join ':', $self->{user}, $self->{password});

  # Make the request to the PAUSE web server
  $self->log("POSTing upload for $file to $uri");
  my $response = $agent->post_multipart($uri, {
    HIDDENNAME                        => $self->{user},
    CAN_MULTIPART                     => 1,
    pause99_add_uri_upload            => File::Basename::basename($file),
    SUBMIT_pause99_add_uri_httpupload => " Upload this file from my disk ",
    pause99_add_uri_uri               => "",
    pause99_add_uri_httpupload        => {
      filename => $file,
      content  => do {open my $fh, '<', $file; binmode $fh; local $/ = <$fh>},
    },
    ($self->{subdir} ? (pause99_add_uri_subdirtext => $self->{subdir}) : ()),
  });

  # So, how'd we do?
  if (not defined $response) {
    die "Request completely failed - we got undef back: $!";
  }

  if (!$response->success) {
    if ($response->status eq '404') {
      die $self->target, "'s CGI for handling messages seems to have moved!\n",
        "(HTTP response code of 404 from the ", $self->target, " web server)\n",
        "It used to be: ", $uri, "\n",
        "Please inform the maintainer of @{[__PACKAGE__]}.\n";
    } else {
      die "request failed with error code ", $response->status,
        "\n  Message: ", $response->reason, "\n";
    }
  } else {
    $self->log_debug($_) for (
      "Looks OK!",
      "----- RESPONSE BEGIN -----\n" .
      $response->content . "\n" .
      "----- RESPONSE END -------\n"
    );

    $self->log($self->target . " add message sent ok [" . $response->status . "]");
  }
}


=method new

  my $uploader = CPAN::Uploader->new(\%arg);

This method returns a new uploader.  You probably don't need to worry about
this method.

Valid arguments are the same as those to C<upload_file>.

=cut

sub new {
  my ($class, $arg) = @_;

  $arg->{$_} or Carp::croak("missing $_ argument") for qw(user password);
  bless $arg => $class;
}

=method read_config_file

  my $config = CPAN::Uploader->read_config_file( $filename );

This reads the config file and returns a hashref of its contents that can be
used as configuration for CPAN::Uploader.

If no filename is given, it looks for F<.pause> in the user's home directory
(from the env var C<HOME>, or the current directory if C<HOME> isn't set).

See L<cpan-upload/CONFIGURATION> for the config format.

=cut

sub read_config_file {
  my ($class, $filename) = @_;

  unless (defined $filename) {
    my $home  = File::HomeDir->my_home || '.';
    $filename = File::Spec->catfile($home, '.pause');

    return {} unless -e $filename and -r _;
  }