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Content.pm
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Content.pm
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# Copyright (C) 2008-2009, Sebastian Riedel.
package Mojo::Content;
use strict;
use warnings;
use base 'Mojo::Stateful';
use bytes;
use Carp 'croak';
use Mojo::Buffer;
use Mojo::Filter::Chunked;
use Mojo::Headers;
use constant CHUNK_SIZE => $ENV{MOJO_CHUNK_SIZE} || 4096;
__PACKAGE__->attr([qw/body_cb filter progress_cb/]);
__PACKAGE__->attr([qw/buffer filter_buffer/] => sub { Mojo::Buffer->new });
__PACKAGE__->attr(headers => sub { Mojo::Headers->new });
__PACKAGE__->attr(raw_header_size => 0);
__PACKAGE__->attr(relaxed => 0);
__PACKAGE__->attr(_body_size => 0);
__PACKAGE__->attr('_eof');
sub body_contains {
croak 'Method "body_contains" not implemented by subclass';
}
sub body_size { croak 'Method "body_size" not implemented by subclass' }
# Operator! Give me the number for 911!
sub build_body {
my $self = shift;
my $body = '';
my $offset = 0;
while (1) {
my $chunk = $self->get_body_chunk($offset);
# No content yet, try again
next unless defined $chunk;
# End of content
last unless length $chunk;
# Content
$offset += length $chunk;
$body .= $chunk;
}
return $body;
}
sub build_headers {
my $self = shift;
my $headers = '';
my $offset = 0;
while (1) {
my $chunk = $self->get_header_chunk($offset);
# No headers yet, try again
next unless defined $chunk;
# End of headers
last unless length $chunk;
# Headers
$offset += length $chunk;
$headers .= $chunk;
}
return $headers;
}
sub generate_body_chunk {
my ($self, $offset) = @_;
# Shortcut
return '' unless $self->body_cb;
# Remove written
my $written = $offset - ($self->buffer->raw_size - $self->buffer->size);
$self->buffer->remove($written);
# Enough in buffer?
if (!$self->_eof && $self->buffer->size < CHUNK_SIZE) {
# Generate
my $chunk = $self->body_cb->($self, $self->buffer->raw_size);
# EOF
if (defined $chunk && !length $chunk) { $self->_eof(1) }
# Buffer chunk
else { $self->buffer->add_chunk($chunk) }
}
# Get chunk
my $chunk = $self->buffer->get(CHUNK_SIZE);
# Pause or EOF
return $self->_eof ? '' : undef unless length $chunk;
return $chunk;
}
sub get_body_chunk {
croak 'Method "get_body_chunk" not implemented by subclass';
}
sub get_header_chunk {
my ($self, $offset) = @_;
# Normal headers
my $copy = $self->_build_headers;
return substr($copy, $offset, CHUNK_SIZE);
}
sub has_leftovers {
my $self = shift;
return 1 if $self->buffer->size || $self->filter_buffer->size;
return;
}
sub header_size { length shift->build_headers }
sub is_chunked {
my $self = shift;
my $encoding = $self->headers->transfer_encoding || '';
return $encoding =~ /chunked/i ? 1 : 0;
}
sub is_multipart {
my $self = shift;
my $type = $self->headers->content_type || '';
return $type =~ /multipart/i ? 1 : 0;
}
sub leftovers {
my $self = shift;
# Chunked leftovers are in the filter buffer, and so are those from a
# HEAD request
return $self->filter_buffer->to_string if $self->filter_buffer->size;
# Normal leftovers
return $self->buffer->to_string;
}
sub parse {
my ($self, $chunk) = @_;
# Buffer
$self->filter_buffer->add_chunk($chunk);
# Parse headers
$self->parse_until_body;
# Still parsing headers
return $self if $self->is_state('headers');
# Chunked, need to filter
if ($self->is_chunked && !$self->is_state('headers')) {
# Initialize filter
$self->filter(
Mojo::Filter::Chunked->new(
headers => $self->headers,
input_buffer => $self->filter_buffer,
output_buffer => $self->buffer
)
) unless $self->filter;
# Filter
$self->filter->parse;
$self->done if $self->filter->is_done;
}
# Not chunked, pass through
else { $self->buffer($self->filter_buffer) }
# Custom body parser
if (my $cb = $self->body_cb) {
# Chunked or relaxed content
if ($self->is_chunked || $self->relaxed) {
$self->$cb($self->buffer->empty);
}
# Normal content
else {
# Need
my $length = $self->headers->content_length || 0;
my $need = $length - $self->_body_size;
# Slurp
if ($need > 0) {
my $chunk = $self->buffer->remove($need);
$self->_body_size($self->_body_size + length $chunk);
$self->$cb($chunk);
}
# Done
$self->done if $length <= $self->raw_body_size;
}
}
# Leftovers
if ($self->is_done) {
$self->state('done_with_leftovers') if $self->has_leftovers;
}
return $self;
}
sub parse_until_body {
my ($self, $chunk) = @_;
# Buffer
$self->filter_buffer->add_chunk($chunk);
# Parser started
if ($self->is_state('start')) {
my $length = $self->filter_buffer->size;
my $raw_length = $self->filter_buffer->raw_size;
my $raw_header_length = $raw_length - $length;
$self->raw_header_size($raw_header_length);
$self->state('headers');
}
# Parse headers
$self->_parse_headers if $self->is_state('headers');
return $self;
}
sub raw_body_size {
my $self = shift;
my $length = $self->filter_buffer->raw_size;
my $header_length = $self->raw_header_size;
return $length - $header_length;
}
sub _build_headers {
my $self = shift;
my $headers = $self->headers->to_string;
return "\x0d\x0a" unless $headers;
return "$headers\x0d\x0a\x0d\x0a";
}
sub _parse_headers {
my $self = shift;
$self->headers->buffer($self->filter_buffer);
$self->headers->parse;
my $length = $self->headers->buffer->size;
my $raw_length = $self->headers->buffer->raw_size;
my $raw_header_length = $raw_length - $length;
$self->raw_header_size($raw_header_length);
$self->state('body') if $self->headers->is_done;
}
1;
__END__
=head1 NAME
Mojo::Content - HTTP Content Base Class
=head1 SYNOPSIS
use base 'Mojo::Content';
=head1 DESCRIPTION
L<Mojo::Content> is a HTTP content base class.
=head1 ATTRIBUTES
L<Mojo::Content> inherits all attributes from L<Mojo::Stateful> and
implements the following new ones.
=head2 C<body_cb>
my $cb = $content->body_cb;
$counter = 1;
$content = $content->body_cb(sub {
my $self = shift;
my $chunk = '';
$chunk = "hello world!" if $counter == 1;
$chunk = "hello world2!\n\n" if $counter == 2;
$counter++;
return $chunk;
});
=head2 C<buffer>
my $buffer = $content->buffer;
$content = $content->buffer(Mojo::Buffer->new);
=head2 C<filter>
my $filter = $content->filter;
$content = $content->filter(Mojo::Filter::Chunked->new);
=head2 C<filter_buffer>
my $filter_buffer = $content->filter_buffer;
$content = $content->filter_buffer(Mojo::Buffer->new);
=head2 C<headers>
my $headers = $content->headers;
$content = $content->headers(Mojo::Headers->new);
=head2 C<progress_cb>
my $cb = $content->progress_cb;
$content = $content->progress_cb(sub {
my $self = shift;
print '+';
});
=head2 C<relaxed>
my $relaxed = $content->relaxed;
$content = $content->relaxed(1);
=head2 C<raw_header_size>
my $size = $content->raw_header_size;
=head1 METHODS
L<Mojo::Content> inherits all methods from L<Mojo::Stateful> and implements
the following new ones.
=head2 C<body_contains>
my $found = $content->body_contains('foo bar baz');
=head2 C<body_size>
my $size = $content->body_size;
=head2 C<build_body>
my $string = $content->build_body;
=head2 C<build_headers>
my $string = $content->build_headers;
=head2 C<generate_body_chunk>
my $chunk = $content->generate_body_chunk(0);
=head2 C<get_body_chunk>
my $chunk = $content->get_body_chunk(0);
=head2 C<get_header_chunk>
my $chunk = $content->get_header_chunk(13);
=head2 C<has_leftovers>
my $leftovers = $content->has_leftovers;
=head2 C<header_size>
my $size = $content->header_size;
=head2 C<is_chunked>
my $chunked = $content->is_chunked;
=head2 C<is_multipart>
my $multipart = $content->is_multipart;
=head2 C<leftovers>
my $bytes = $content->leftovers;
=head2 C<parse>
$content = $content->parse("Content-Length: 12\r\n\r\nHello World!");
=head2 C<parse_until_body>
$content = $content->parse_until_body(
"Content-Length: 12\r\n\r\nHello World!"
);
=head2 C<raw_body_size>
my $size = $content->raw_body_size;
=cut