projekt kivitendo

package SL::DB::Helper::ThumbnailCreator;

use strict;

use parent qw(SL::Controller::Base);

use SL::Locale::String qw(t8);

use Carp;

use GD;

use Image::Info;

use File::MimeInfo::Magic;

use List::MoreUtils qw(apply);

use List::Util qw(max);

use Rose::DB::Object::Util;

require Exporter;

our @ISA      = qw(Exporter);

our @EXPORT   = qw(file_create_thumbnail file_update_thumbnail file_probe_type file_update_type_and_dimensions);

# TODO PDFs and others like odt,txt,...

our %supported_mime_types = (

  'image/gif'  => { extension => 'gif', convert_to_png => 1, },

  'image/png'  => { extension => 'png' },

  'image/jpeg' => { extension => 'jpg' },

  'image/tiff' => { extension => 'tif'},

);

sub file_create_thumbnail {

  my ($self) = @_;

  croak "No picture set yet" if !$self->file_content;

  my $image            = GD::Image->new($self->file_content);

  my ($width, $height) = $image->getBounds;

  my $max_dim          = 64;

  my $curr_max         = max $width, $height, 1;

  my $factor           = $curr_max <= $max_dim ? 1 : $curr_max / $max_dim;

  my $new_width        = int($width  / $factor + 0.5);

  my $new_height       = int($height / $factor + 0.5);

  my $thumbnail        = GD::Image->new($new_width, $new_height);

  $thumbnail->copyResized($image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

  $self->thumbnail_img_content($thumbnail->png);

  $self->thumbnail_img_content_type('image/png');

  $self->thumbnail_img_width($new_width);

  $self->thumbnail_img_height($new_height);

  return 1;

}

sub file_update_thumbnail {

  my ($self) = @_;

  return 1 if !$self->file_content || !$self->file_content_type || !Rose::DB::Object::Util::get_column_value_modified($self, 'file_content');

  $self->file_create_thumbnail;

  return 1;

}

sub file_probe_type {

  my ($self) = @_;

  return (t8("No file uploaded yet")) if !$self->file_content;

  my $mime_type = File::MimeInfo::Magic::magic($self->file_content);

  my $info = Image::Info::image_info(\$self->{file_content});

  if (!$info || $info->{error} || !$info->{file_media_type} || !$supported_mime_types{ $info->{file_media_type} }) {

    $::lxdebug->warn("Image::Info error: " . $info->{error}) if $info && $info->{error};

    return (t8('Unsupported image type (supported types: #1)', join(' ', sort keys %supported_mime_types)));

  }

  $self->file_content_type($info->{file_media_type});

  $self->files_img_width($info->{width});

  $self->files_img_height($info->{height});

  $self->files_mtime(DateTime->now_local);

  $self->file_create_thumbnail;

  return ();

}

sub file_update_type_and_dimensions {

  my ($self) = @_;

  return () if !$self->file_content;

  return () if $self->file_content_type && $self->files_img_width && $self->files_img_height && !Rose::DB::Object::Util::get_column_value_modified($self, 'file_content');

  my @errors = $self->file_probe_type;

  return @errors if @errors;

  my $info = $supported_mime_types{ $self->file_content_type };

  if ($info->{convert_to_png}) {

    $self->file_content(GD::Image->new($self->file_content)->png);

    $self->file_content_type('image/png');

    $self->filename(apply { s/\.[^\.]+$//;  $_ .= '.png'; } $self->filename);

  }

  return ();

}

1;

__END__

=pod

=encoding utf8

=head1 NAME

SL::DB::Helper::ThumbnailCreator - DatabaseClass Helper for Fileuploads

=head1 SYNOPSIS

use SL::DB::Helper::ThumbnailCreator;

# synopsis...

=head1 DESCRIPTION

# longer description..

=head1 AUTHOR

Werner Hahn E<lt>wh@futureworldsearch.netE<gt>

=cut