Travis Chase > Catalyst-View-Download-0.09 > Catalyst::View::Download

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Module Version: 0.09   Source  

NAME ^

Catalyst::View::Download

VERSION ^

0.09

SYNOPSIS ^

    # Use the helper
    > script/create.pl view Download Download

    # or just add your own...
    # lib/MyApp/View/Download.pm
    package MyApp::View::Download;
    use Moose;
    use namespace::autoclean;

    extends 'Catalyst::View::Download';

    1;

    # lib/MyApp/Controller/SomeController.pm
    sub example_action : Local {
        my ($self, $c, $content_type) = @_;

        my $data = [
            ['00','01','02','03'],
            ['10','11','12','13'],
            ['20','21','22','23'],
            ['30','31','32','33']
        ];

        if( $content_type ) {
            # For this example we are only using csv, html and plain.
            # xml is also available and you can add any of your own
            # modules under your MyApp::View::Download:: namespace.
            $content_type = 'plain' unless
                scalar(
                    grep { $content_type eq $_ }
                    qw(csv html plain)
                );

            # Set the response header content type
            $c->res->header('Content-Type' => 'text/' . $content_type);

            # OR set the content type in the stash variable 'download'
            # to process it. (Note: this is configurable)
            $c->stash->{'download'} = 'text/' . $content_type;

            # This is here just so I can do some quick data formatting
            # for this example.
            my $format = {
                'html' => sub {
                    return  "<!DOCTYPE html><html><head><title>Data</title></head><body>"
                            . join( "<br>", map { join( " ", @$_ ) } @$data )
                            . "</body></html>";
                },
                'plain' => sub {
                    return  join( "\n", map { join( " ", @$_ ) } @$data );
                },
                'csv' => sub { return $data; }
            };

            # Store the data in the appropriate stash key.
            # 'csv' for csv, 'html' for html, etc.
            $c->stash->{$content_type} = $format->{$content_type}();

            # You can optionally set the outfile_name or the current action name
            # will be used
            $c->stash->{'outfile_name'} = 'filename';

            # Use the Download View
            $c->detach('MyApp::View::Download');
        }

        # In this example if a content type isn't specified a page is then displayed
        $c->res->body('Display page as normal.');
    }

DESCRIPTION ^

A view module to help in the convenience of downloading data into many supportable formats.

SUBROUTINES ^

process

This method will be called by Catalyst if it is asked to forward to a component without a specified action.

render

Allows others to use this view for much more fine-grained content generation.

CONFIG ^

stash_key

Determines the key in the stash this view will look for when attempting to retrieve the type of format to process. If this key isn't found it will search for a Content-Type header for the format. Further if neither are found a default format will be applied.

    $c->view('MyApp::View::Download')->config->{'stash_key'} = 'content_type';
default

Determines which Content-Type to use by default. Default: 'text/plain'

    $c->view('MyApp::View::Download')->config('default' => 'text/plain');
content_type

A hash ref of hash refs. Each key in content_type is Content-Type that is handled by this view.

    $c->view('MyApp::View::Download')->config->{'content_type'}{'text/csv'} = {
        outfile_ext => 'csv',
        module      => 'My::Module'
    };

The Content-Type key refers to it's own hash of parameters to determine the actions thie view should take for that Content-Type.

'outfile_ext' - The extenstion of the file that will downloaded.

'module' - The name of the module that will handle data output. If there is a plus symbol '+' at the beginning of the module name, this will indicate that the module is either a MyApp::View module or a Catalyst::View module and the appropriate namespace will be added to the beginning of the module name.

    # Module Loaded: Catalyst::View::Download::CSV
    $c->view('MyApp::View::Download')
        ->config
        ->{'content_type'}{'text/csv'}{'module'} = '+Download::CSV';

    # Module Loaded: My::Module::CSV
    $c->view('MyApp::View::Download')
        ->config
        ->{'content_type'}{'text/csv'}{'module'} = 'My::Module::CSV';

Content-Type Module Requirements ^

Any module set as 'the' module for a certain Content-Type needs to have a subroutine named 'render' that returns the content to output with the following parameters handled.

$c

The catalyst $c variable

$template

In case a template file is needed for the module. This view will pass $c->stash->{template} as this value.

$args

A list of arguments the module will use to process the data into content. This view will pass $c->stash as this value.

INCLUDED CONTENT TYPES ^

text/csv

Catalyst::View::Download has the following default configuration for this Content-Type.

    $c->view('MyApp::View::Download')->config->{'content_type'}{'text/csv'} = {
        outfile_ext => 'csv',
        module      => '+Download::CSV'
    };

See Catalyst::View::Download::CSV for more details.

text/html

Catalyst::View::Download has the following default configuration for this Content-Type.

    $c->view('MyApp::View::Download')->config->{'content_type'}{'text/html'} = {
        outfile_ext => 'html',
        module      => '+Download::HTML'
    };

See Catalyst::View::Download::HTML for more details.

text/plain

Catalyst::View::Download has the following default configuration for this Content-Type.

    $c->view('MyApp::View::Download')->config->{'default'} = 'text/plain';

    $c->view('MyApp::View::Download')->config->{'content_type'}{'text/plain'} = {
        outfile_ext => 'txt',
        module      => '+Download::Plain'
    };

See Catalyst::View::Download::Plain for more details.

text/xml

Catalyst::View::Download has the following default configuration for this Content-Type.

    $c->view('MyApp::View::Download')->config->{'content_type'}{'text/xml'} = {
        outfile_ext => 'xml',
        module      => '+Download::XML'
    };

See Catalyst::View::Download::XML for more details.

BUGS ^

SEE ALSO ^

Catalyst, Catalyst::View

AUTHOR ^

Travis Chase, <gaudeon at cpan dot org>

ACKNOWLEDGEMENTS ^

Thanks to following people for their constructive comments and help:

J. Shirley
Jonathan Rockway
Jon Schutz
Kevin Frost
Michele Beltrame
Dave Lambley

LICENSE ^

This program is free software. You can redistribute it and/or modify it under the same terms as Perl itself.

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