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HTTP::Proxy::BodyFilter::simple
Section: User Contributed Perl Documentation (3)
Updated: 2010-03-30
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NAME
HTTP::Proxy::BodyFilter::simple - A class for creating simple filters
SYNOPSIS
use HTTP::Proxy::BodyFilter::simple;
# a simple s/// filter
my $filter = HTTP::Proxy::BodyFilter::simple->new(
sub { ${ $_[1] } =~ s/foo/bar/g; }
);
$proxy->push_filter( response => $filter );
DESCRIPTION
HTTP::Proxy::BodyFilter::simple can create BodyFilter without going
through the hassle of creating a full-fledged class. Simply pass
a code reference to the "filter()" method of your filter to the constructor,
and you'll get the adequate filter.
Constructor calling convention
The constructor can be called in several ways, which are shown in the
synopsis:
- single code reference
-
The code reference must conform to the standard filter() signature:
sub filter {
my ( $self, $dataref, $message, $protocol, $buffer ) = @_;
...
}
It is assumed to be the code for the "filter()" method.
See HTTP::Proxy::BodyFilter.pm for more details about the "filter()" method.
- name/coderef pairs
-
The name is the name of the method ("filter", "begin", "end")
and the coderef is the method itself.
See HTTP::Proxy::BodyFilter for the methods signatures.
METHODS
This filter ``factory'' defines the standard HTTP::Proxy::BodyFilter
methods, but those are only, erm, ``proxies'' to the actual CODE references
passed to the constructor. These ``proxy'' methods are:
- filter()
-
- begin()
-
- end()
-
Two other methods are actually HTTP::Proxy::BodyFilter::simple methods,
and are called automatically:
- init()
-
Initalise the filter instance with the code references passed to the
constructor.
- can()
-
Return the actual code reference that will be run, and not the ``proxy''
methods. If called with any other name than "begin", "end" and
"filter", calls UNIVERSAL::can() instead.
There is also a method that returns a boolean value:
- will_modify()
-
The "will_modify()" method returns a scalar value (boolean) indicating
if the filter may modify the body data. The default method returns a
true value, so you only need to set this value when you are absolutely
certain that the filter will not modify data (or at least not modify
its final length).
Here's a simple example:
$filter = HTTP::Proxy::BodyFilter::simple->new(
filter => sub { ${ $_[1] } =~ s/foo/bar/g; },
will_modify => 0, # "foo" is the same length as "bar"
);
SEE ALSO
HTTP::Proxy, HTTP::Proxy::BodyFilter.
AUTHOR
Philippe ``BooK'' Bruhat, <book@cpan.org>.
COPYRIGHT
Copyright 2003-2006, Philippe Bruhat.
LICENSE
This module is free software; you can redistribute it or modify it under
the same terms as Perl itself.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- Constructor calling convention
-
- METHODS
-
- SEE ALSO
-
- AUTHOR
-
- COPYRIGHT
-
- LICENSE
-
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