--- /dev/null
+package SL::Controller::Helper::ThumbnailCreator;
+
+use strict;
+
+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_probe_image_type file_update_type_and_dimensions);
+
+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 ($thumb, %params) = @_;
+
+ croak "No picture set yet" if !$thumb->{content};
+
+ my $image = GD::Image->new($thumb->{content});
+ my ($width, $height) = $image->getBounds;
+ my $max_dim = $params{size} // 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);
+
+ $thumb->{thumbnail_img_content} = $thumbnail->png;
+ $thumb->{thumbnail_img_content_type} = "image/png";
+ $thumb->{thumbnail_img_width} = $new_width;
+ $thumb->{thumbnail_img_height} = $new_height;
+ return $thumb;
+
+}
+
+sub file_update_thumbnail {
+ my ($self) = @_;
+
+ return 1 if !$self->file_content || !$self->file_content_type || !Rose::DB::Object::Util::get_column_value_modified($self, 'file_content');
+ $self->file_create_thumbnail;
+ return 1;
+}
+
+sub file_probe_image_type {
+ my ($self, $mime_type, $basefile) = @_;
+
+ if ( !$supported_mime_types{ $mime_type } ) {
+ $self->js->flash('error',t8('file \'#1\' has unsupported image type \'#2\' (supported types: #3)',
+ $basefile, $mime_type, join(' ', sort keys %supported_mime_types)));
+ return 1;
+ }
+ return 0;
+}
+
+sub file_probe_type {
+ my ($content, %params) = @_;
+ return (t8("No file uploaded yet")) if !$content;
+ my $info = Image::Info::image_info(\$content);
+ if (!$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)));
+ }
+
+ my $thumbnail;
+ $thumbnail->{file_content_type} = $info->{file_media_type};
+ $thumbnail->{file_image_width} = $info->{width};
+ $thumbnail->{file_image_height} = $info->{height};
+ $thumbnail->{content} = $content;
+
+ $thumbnail = &file_create_thumbnail($thumbnail, %params);
+
+ return $thumbnail;
+}
+
+sub file_update_type_and_dimensions {
+ my ($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::Controller::Helper::ThumbnailCreator - Helper for Fileuploads
+
+=head1 SYNOPSIS
+
+use SL::Controller::Helper::ThumbnailCreator;
+
+=head1 AUTHOR
+
+Werner Hahn E<lt>wh@futureworldsearch.netE<gt>