FM / LWP

/usr/share/perl5/vendor_perl/LWP

Name	Size	Mode	Actions
Authen/	-	0755	rm
Debug/	-	0755	rm
Protocol/	-	0755	rm
ConnCache.pm	8739	0644	edit dl rm
Debug.pm	2914	0644	edit dl rm
DebugFile.pm	67	0644	edit dl rm
media.types	49815	0644	edit dl rm
MediaTypes.pm	6928	0644	edit dl rm
MemberMixin.pm	875	0644	edit dl rm
Protocol.pm	9015	0644	edit dl rm
RobotUA.pm	7893	0644	edit dl rm
Simple.pm	6550	0644	edit dl rm
UserAgent.pm	72843	0644	edit dl rm

Edit: /usr/share/perl5/vendor_perl/LWP/Protocol.pm (9015B)

package LWP::Protocol;

use base 'LWP::MemberMixin';

our $VERSION = '6.53';

use strict;
use Carp ();
use HTTP::Status ();
use HTTP::Response ();
use Try::Tiny qw(try catch);

my %ImplementedBy = (); # scheme => classname

sub new
{
    my($class, $scheme, $ua) = @_;

my $self = bless {
	scheme => $scheme,
	ua => $ua,

# historical/redundant
        max_size => $ua->{max_size},
    }, $class;

$self;
}

sub create
{
    my($scheme, $ua) = @_;
    my $impclass = LWP::Protocol::implementor($scheme) or
	Carp::croak("Protocol scheme '$scheme' is not supported");

# hand-off to scheme specific implementation sub-class
    my $protocol = $impclass->new($scheme, $ua);

return $protocol;
}

sub implementor
{
    my($scheme, $impclass) = @_;

if ($impclass) {
	$ImplementedBy{$scheme} = $impclass;
    }
    my $ic = $ImplementedBy{$scheme};
    return $ic if $ic;

return '' unless $scheme =~ /^([.+\-\w]+)$/;  # check valid URL schemes
    $scheme = $1; # untaint
    $scheme =~ tr/.+-/_/;  # make it a legal module name

# scheme not yet known, look for a 'use'd implementation
    $ic = "LWP::Protocol::$scheme";  # default location
    $ic = "LWP::Protocol::nntp" if $scheme eq 'news'; #XXX ugly hack
    no strict 'refs';
    # check we actually have one for the scheme:
    unless (@{"${ic}::ISA"}) {
        # try to autoload it
        try {
            (my $class = $ic) =~ s{::}{/}g;
            $class .= '.pm' unless $class =~ /\.pm$/;
            require $class;
        }
        catch {
            my $error = $_;
            if ($error =~ /Can't locate/) {
                $ic = '';
            }
            else {
                die "$error\n";
            }
        };
    }
    $ImplementedBy{$scheme} = $ic if $ic;
    $ic;
}

sub request
{
    my($self, $request, $proxy, $arg, $size, $timeout) = @_;
    Carp::croak('LWP::Protocol::request() needs to be overridden in subclasses');
}

# legacy
sub timeout    { shift->_elem('timeout',    @_); }
sub max_size   { shift->_elem('max_size',   @_); }

sub collect
{
    my ($self, $arg, $response, $collector) = @_;
    my $content;
    my($ua, $max_size) = @{$self}{qw(ua max_size)};

# This can't be moved to Try::Tiny due to the closures within causing
    # leaks on any version of Perl prior to 5.18.
    # https://perl5.git.perl.org/perl.git/commitdiff/a0d2bbd5c
    my $error = do { #catch
        local $@;
        local $\; # protect the print below from surprises
        eval { # try
            if (!defined($arg) || !$response->is_success) {
                $response->{default_add_content} = 1;
            }
            elsif (!ref($arg) && length($arg)) {
                open(my $fh, ">", $arg) or die "Can't write to '$arg': $!";
                binmode($fh);
                push(@{$response->{handlers}{response_data}}, {
                    callback => sub {
                        print $fh $_[3] or die "Can't write to '$arg': $!";
                        1;
                    },
                });
                push(@{$response->{handlers}{response_done}}, {
                    callback => sub {
                        close($fh) or die "Can't write to '$arg': $!";
                        undef($fh);
                    },
                });
            }
            elsif (ref($arg) eq 'CODE') {
                push(@{$response->{handlers}{response_data}}, {
                    callback => sub {
                        &$arg($_[3], $_[0], $self);
                        1;
                    },
                });
            }
            else {
                die "Unexpected collect argument '$arg'";
            }

$ua->run_handlers("response_header", $response);

if (delete $response->{default_add_content}) {
                push(@{$response->{handlers}{response_data}}, {
                    callback => sub {
                        $_[0]->add_content($_[3]);
                        1;
                    },
                });
            }

my $content_size = 0;
            my $length = $response->content_length;
            my %skip_h;

while ($content = &$collector, length $$content) {
                for my $h ($ua->handlers("response_data", $response)) {
                    next if $skip_h{$h};
                    unless ($h->{callback}->($response, $ua, $h, $$content)) {
                        # XXX remove from $response->{handlers}{response_data} if present
                        $skip_h{$h}++;
                    }
                }
                $content_size += length($$content);
                $ua->progress(($length ? ($content_size / $length) : "tick"), $response);
                if (defined($max_size) && $content_size > $max_size) {
                    $response->push_header("Client-Aborted", "max_size");
                    last;
                }
            }
            1;
        };
        $@;
    };

if ($error) {
        chomp($error);
        $response->push_header('X-Died' => $error);
        $response->push_header("Client-Aborted", "die");
    };
    delete $response->{handlers}{response_data};
    delete $response->{handlers} unless %{$response->{handlers}};
    return $response;
}

sub collect_once
{
    my($self, $arg, $response) = @_;
    my $content = \ $_[3];
    my $first = 1;
    $self->collect($arg, $response, sub {
	return $content if $first--;
	return \ "";
    });
}

__END__

=pod

=head1 NAME

LWP::Protocol - Base class for LWP protocols

=head1 SYNOPSIS

package LWP::Protocol::foo;
 use base qw(LWP::Protocol);

=head1 DESCRIPTION

This class is used as the base class for all protocol implementations
supported by the LWP library.

When creating an instance of this class using
C<LWP::Protocol::create($url)>, and you get an initialized subclass
appropriate for that access method. In other words, the
L<LWP::Protocol/create> function calls the constructor for one of its
subclasses.

All derived C<LWP::Protocol> classes need to override the request()
method which is used to service a request. The overridden method can
make use of the collect() function to collect together chunks of data
as it is received.

=head1 METHODS

The following methods and functions are provided:

=head2 new

my $prot = LWP::Protocol->new();

The LWP::Protocol constructor is inherited by subclasses. As this is a
virtual base class this method should B<not> be called directly.

=head2 create

my $prot = LWP::Protocol::create($scheme)

Create an object of the class implementing the protocol to handle the
given scheme. This is a function, not a method. It is more an object
factory than a constructor. This is the function user agents should
use to access protocols.

=head2 implementor

my $class = LWP::Protocol::implementor($scheme, [$class])

Get and/or set implementor class for a scheme.  Returns C<''> if the
specified scheme is not supported.

=head2 request

$response = $protocol->request($request, $proxy, undef);
    $response = $protocol->request($request, $proxy, '/tmp/sss');
    $response = $protocol->request($request, $proxy, \&callback, 1024);

Dispatches a request over the protocol, and returns a response
object. This method needs to be overridden in subclasses.  Refer to
L<LWP::UserAgent> for description of the arguments.

=head2 collect

my $res = $prot->collect(undef, $response, $collector); # stored in $response
    my $res = $prot->collect($filename, $response, $collector);
    my $res = $prot->collect(sub { ... }, $response, $collector);

Collect the content of a request, and process it appropriately into a scalar,
file, or by calling a callback. If the first parameter is undefined, then the
content is stored within the C<$response>. If it's a simple scalar, then it's
interpreted as a file name and the content is written to this file.  If it's a
code reference, then content is passed to this routine.

The collector is a routine that will be called and which is
responsible for returning pieces (as ref to scalar) of the content to
process.  The C<$collector> signals C<EOF> by returning a reference to an
empty string.

The return value is the L<HTTP::Response> object reference.

B<Note:> We will only use the callback or file argument if
C<< $response->is_success() >>.  This avoids sending content data for
redirects and authentication responses to the callback which would be
confusing.

=head2 collect_once

$prot->collect_once($arg, $response, $content)

Can be called when the whole response content is available as content. This
will invoke L<LWP::Protocol/collect> with a collector callback that
returns a reference to C<$content> the first time and an empty string the
next.

=head1 SEE ALSO

Inspect the F<LWP/Protocol/file.pm> and F<LWP/Protocol/http.pm> files
for examples of usage.

=head1 COPYRIGHT

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

=cut

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