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# Copyright (C) 2008-2010, Sebastian Riedel.
package Mojo::Filter::Chunked;
use strict;
use warnings;
use base 'Mojo::Filter';
# Here's to alcohol, the cause of—and solution to—all life's problems.
sub build {
my ($self, $chunk) = @_;
# Done
return '' if $self->is_done;
# Shortcut
return unless defined $chunk;
my $chunk_length = length $chunk;
# Trailing headers
my $headers = ref $chunk && $chunk->isa('Mojo::Headers') ? 1 : 0;
# End
my $formatted = '';
if ($headers || ($chunk_length == 0)) {
$self->done;
# Normal end
$formatted = "\x0d\x0a0\x0d\x0a";
# Trailing headers
$formatted .= $headers ? "$chunk\x0d\x0a\x0d\x0a" : "\x0d\x0a";
}
# Separator
else {
# First chunk has no leading CRLF
$formatted = "\x0d\x0a" unless $self->is_state('start');
$self->state('chunks');
# Chunk
$formatted .= sprintf('%x', length $chunk) . "\x0d\x0a$chunk";
}
return $formatted;
}
sub parse {
my $self = shift;
# Trailing headers
if ($self->is_state('trailing_headers')) {
$self->_parse_trailing_headers;
return $self;
}
# New chunk (ignore the chunk extension)
my $filter = $self->input_buffer;
my $content = $filter->to_string;
my $buffer = $self->output_buffer;
while ($content =~ /^((?:\x0d?\x0a)?([\da-fA-F]+).*\x0d?\x0a)/) {
my $header = $1;
my $length = hex($2);
# Last chunk
if ($length == 0) {
$filter->remove(length $header);
$self->state('trailing_headers');
last;
}
# Read chunk
else {
# Whole chunk
if (length $content >= (length($header) + $length)) {
# Remove header
$content =~ s/^$header//;
$filter->remove(length $header);
# Remove payload
substr $content, 0, $length, '';
$buffer->add_chunk($filter->remove($length));
# Remove newline at end of chunk
$content =~ s/^(\x0d?\x0a)// and $filter->remove(length $1);
}
# Not a whole chunk, wait for more data
else {last}
}
}
# Trailing headers
$self->_parse_trailing_headers if $self->is_state('trailing_headers');
}
sub _parse_trailing_headers {
my $self = shift;
# Parse
my $headers = $self->headers;
$headers->state('headers');
$headers->parse;
# Done
if ($headers->is_done) {
$self->_remove_chunked_encoding;
$self->done;
}
}
sub _remove_chunked_encoding {
my $self = shift;
# Remove encoding
my $headers = $self->headers;
my $encoding = $headers->transfer_encoding;
$encoding =~ s/,?\s*chunked//ig;
$encoding
? $headers->transfer_encoding($encoding)
: $headers->remove('Transfer-Encoding');
$headers->content_length($self->output_buffer->raw_size);
}
1;
__END__
=head1 NAME
Mojo::Filter::Chunked - HTTP 1.1 Chunked Filter
=head1 SYNOPSIS
use Mojo::Filter::Chunked;
my $chunked = Mojo::Filter::Chunked->new;
$chunked->headers(Mojo::Headers->new);
$chunked->input_buffer(Mojo::ByteStream->new);
$chunked->output_buffer(Mojo::ByteStream->new);
$chunked->input_buffer->add_chunk("6\r\nHello!")
$chunked->parse;
print $chunked->output_buffer->empty;
print $chunked->build('Hello World!');
=head1 DESCRIPTION
L<Mojo::Filter::Chunked> is a filter for the HTTP 1.1 chunked transfer
encoding as described in RFC 2616.
=head1 ATTRIBUTES
L<Mojo::Filter::Chunked> inherits all attributes from L<Mojo::Filter>.
=head1 METHODS
L<Mojo::Filter::Chunked> inherits all methods from L<Mojo::Filter> and
implements the following new ones.
=head2 C<build>
my $formatted = $filter->build('Hello World!');
Build chunked content.
=head2 C<parse>
$filter = $filter->parse;
Filter chunked content.
=head1 SEE ALSO
L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicious.org>.
=cut
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