data::formvalidator::constraints::upload(3pm) [debian man page]

Data::FormValidator::Constraints::Upload(3pm)		User Contributed Perl Documentation	     Data::FormValidator::Constraints::Upload(3pm)

NAME

       Data::FormValidator::Constraints::Upload - Validate File Uploads

SYNOPSIS

	   # Be sure to use a CGI.pm or CGI::Simple object as the form
	   # input when using this constraint
	   my $q = CGI->new;

	   use Data::FormValidator::Constraints::Upload qw(
		   file_format
		   file_max_bytes
		   image_max_dimensions
		   image_min_dimensions
	   );
	   my $dfv = Data::FormValidator->check($q,$my_profile);

	   # In a Data::FormValidator Profile:
	   constraint_methods => {
	       image_name => [
		   file_format(),
		   file_max_bytes(10),
		   image_max_dimensions(200,200),
		   image_min_dimensions(100,100),
		],
	   }

DESCRIPTION

       Note: This is a new module is a new addition to Data::FormValidator and is should be considered "Beta".

       These module is meant to be used in conjunction with the Data::FormValidator module to automate the task of validating uploaded files. The
       following validation routines are supplied.

       To use any of them, the input data passed to Data::FormValidator must be a CGI.pm object.

       file_format
	   This function checks the format of the file, based on the MIME type if it's available, and a case-insensitive version of the file
	   extension otherwise. By default, it tries to validate JPEG, GIF and PNG images. The params are:

	    optional hash reference of parameters. A key named I<mime_types> points to
	    array references of valid values.

	      file_format( mime_types => [qw!image/jpeg image/gif image/png!] );

	   Calling this function sets some meta data which can be retrieved through the "meta()" method of the Data::FormValidator::Results
	   object.  The meta data added is "extension" and "mime_type".

	   The MIME type of the file will first be tried to figured out by using the <File::MMagic> module to examine the file. If that doesn't
	   turn up a result, we'll use a MIME type from the browser if one has been provided. Otherwise, we give up. The extension we return is
	   based on the MIME type we found, rather than trusting the one that was uploaded.

	   NOTE: if we have to fall back to using the MIME type provided by the browser, we access it from the original input data and not the
	   filtered data.  This should only cause issue when you have used a filter to alter the type of file that was uploaded (e.g. image
	   conversion).

       file_max_bytes
	   This function checks the maximum size of an uploaded file. By default, it checks to make sure files are smaller than 1 Meg. The params
	   are:

	    reference to max file size in bytes

	       file_max_bytes(1024), # 1 k

	   Calling this function sets some meta data which can be retrieved through the "meta()" method of the Data::FormValidator::Results
	   object.  The meta data added is "bytes".

       image_max_dimensions
	   This function checks to make sure an uploaded image is no longer than some maximum dimensions. The params are:

	    reference to max pixel width
	    reference to max pixel height

	       image_max_dimensions(200,200),

	   Calling this function sets some meta data which can be retrieved through the "meta()" method of the Data::FormValidator::Results
	   object.  The meta data added is "width" and "height".

       image_min_dimensions
	   This function checks to make sure an uploaded image is longer than some minimum dimensions. The params are:

	    reference to min pixel width
	    reference to min pixel height

	       image_min_dimensions(100,100),

	   Calling this function sets some meta data which can be retrieved through the "meta()" method of the Data::FormValidator::Results
	   object.  The meta data added is "width" and "height".

   BACKWARDS COMPATIBILITY
       An older more awkward interface to the constraints in this module is still supported.  To use it, you have to load the package with
       'validator_packages', and call each constraint in a hashref style, passing the the parameters by reference. It looks like this:

	   validator_packages => [qw(Data::FormValidator::Constraints::Upload)],
	   constraints => {
	       image_name => [
		   {
		       constraint_method => 'image_max_dimensions',
		       params => [200,200],
		   }
		],
	   }

       I told you it was more awkward. That was before I grokked the magic of closures, which is what drives the current interface.

SEE ALSO

       FileMetadata, Data::FormValidator, CGI, perl

AUTHOR

       Mark Stosberg, <mark@summersault.com>

COPYRIGHT AND LICENSE

       Copyright 2003-2005 by Mark Stosberg

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2011-11-25			     Data::FormValidator::Constraints::Upload(3pm)