NAME
CatalystX::DebugFilter - Provides configurable filtering of data that is logged to the debug logs (and error screen)
VERSION
version 0.02
SYNOPSIS
package MyApp;
use Catalyst;
with 'CatalystX::DebugFilter';
__PACKAGE__->config(
'CatalystX::DebugFilter' => {
# filter all "Cookie" headers as well as "password" and "SECRET" parameters
Request => { headers => 'Cookie', params => [ 'password', qr/SECRET/ ] },
# filter all Set-Cookie values in the response
Response => { headers => 'Set-Cookie' },
Stash => [
sub {
my ( $key, $value ) = @_;
my $type = ref($value);
# ignore any non-ref values
return undef if !$type;
if ( $type->isa('DBIx::Class::ResultSet') ) { # dump ResultSet objects as SQL
return $value->as_query;
} elsif ( $type->isa('DBIx::Class::Result') ) { # dump Result objects as simple HASH
return { $value->get_columns };
} else { # ignore these
return undef;
}
},
]
}
);DESCRIPTION
This module provides a Moose role that will filter certain elements of a request/response/stash before they are logged to the debug logs (or the error screen).
METHODS
dump_these
This role uses an "around" method modifier on the "dump_these" in Catalyst method and modifies the elements returned according to the configuration provided by the user as demonstrated in the SYNOPSIS section.
FILTER CONFIGURATION
There are few different types of filters that can be defined:
Exact Match
The parameter/header/stash key is compared against a literal string. If it matches, the value is replaced with
[FILTERED]Regular Expression
The parameter/header/stash key is compared against a regular expression. If it matches, the value is replaced with
[FILTERED]Callback
The parameter/header/stash key and value are passed to a callback function. If the function returns a defined value, that value is used instead of the original value.
This module supports filtering a few different types of data (naturally, these could all be combined into a single config call):
Request Parameters
__PACKAGE__->config( 'CatalystX::DebugFilter' => { Request => { params => $filters } } );Request Headers
Useful with CatalystX::Debug::RequestHeaders:
__PACKAGE__->config( 'CatalystX::DebugFilter' => { Request => { headers => $filters } } );Response Headers
Useful with CatalystX::Debug::ResponseHeaders:
__PACKAGE__->config( 'CatalystX::DebugFilter' => { Response => { headers => $filters } } );Stash Data
__PACKAGE__->config( 'CatalystX::DebugFilter' => { Stash => $filters } );
In each of the above examples, $filters can be one of a few things:
A non-ref scalar, implying an exact match
A Regexp reference, implying an regular expression match
A CODE reference, implying a callback matching function
An ARRAY reference of any of the above
CAVEATS
This module will not magically remove all references to a specific piece of data unless filters are explicitly defined for each place this data is stored. For instance, you may define a request parameter filter to prevent passwords from being logged to the debug logs but if you create an object that contains that password and store it in the stash, the password value may still appear on the error screen.
Also, the stash is only filtered at the top level. If you would like to filter more extensively, you can use a filter callback to traverse the stash, modifying whatever data you like (a copy is made before passing the value to the callback).
SEE ALSO
AUTHOR
Brian Phillips <bphillips@cpan.org>COPYRIGHT AND LICENSE
This software is copyright (c) 2010 by Brian Phillips.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.