package Mojo::Message;
use Carp 'croak';
use Mojo::Util 'decode';
has content => sub { Mojo::Content::Single->new };
has default_charset => 'UTF-8';
has max_line_size => sub { $ENV{MOJO_MAX_LINE_SIZE} || 10240 };
has max_message_size => sub { $ENV{MOJO_MAX_MESSAGE_SIZE} || 5242880 };
has version => '1.1';
sub body {
my $self = shift;
# Downgrade multipart content
my $content = $self->content;
$content = $self->content(Mojo::Content::Single->new)->content
if $content->is_multipart;
# Get
return $content->asset->slurp unless @_;
# Set raw content
$content->asset(Mojo::Asset::Memory->new->add_chunk(@_));
return $self;
}
sub body_params {
my $self = shift;
return $self->{body_params} if $self->{body_params};
my $params = $self->{body_params} = Mojo::Parameters->new;
$params->charset($self->content->charset || $self->default_charset);
# "x-application-urlencoded" and "application/x-www-form-urlencoded"
my $type = $self->headers->content_type // '';
if ($type =~ m!(?:x-application|application/x-www-form)-urlencoded!i) {
$params->parse($self->content->asset->slurp);
}
# "multipart/formdata"
elsif ($type =~ m!multipart/form-data!i) {
for my $data (@{$self->_parse_formdata}) {
$params->append($data->[0], $data->[2]) unless defined $data->[1];
}
}
return $params;
}
sub body_size { shift->content->body_size }
sub build_body { shift->_build('get_body_chunk') }
sub build_headers { shift->_build('get_header_chunk') }
sub build_start_line { shift->_build('get_start_line_chunk') }
sub cookie { shift->_cache(cookies => @_) }
sub cookies { croak 'Method "cookies" not implemented by subclass' }
sub dom {
my $self = shift;
return undef if $self->content->is_multipart;
my $html = $self->body;
my $charset = $self->content->charset;
$html = decode($charset, $html) // $html if $charset;
my $dom = $self->{dom} ||= Mojo::DOM->new($html);
return @_ ? $dom->find(@_) : $dom;
}
sub error {
my $self = shift;
# Set
if (@_) {
$self->{error} = [@_];
return $self->finish;
}
# Get
return unless my $err = $self->{error};
return wantarray ? @$err : $err->[0];
}
sub extract_start_line {
croak 'Method "extract_start_line" not implemented by subclass';
}
sub finish {
my $self = shift;
$self->{state} = 'finished';
return $self->{finished}++ ? $self : $self->emit('finish');
}
sub fix_headers {
my $self = shift;
# Content-Length or Connection (unless chunked transfer encoding is used)
my $content = $self->content;
return $self if $self->{fix}++ || $content->is_chunked;
my $headers = $self->headers;
$content->is_dynamic
? $headers->connection('close')
: $headers->content_length($self->body_size)
unless $headers->content_length;
return $self;
}
sub get_body_chunk {
my ($self, $offset) = @_;
$self->emit('progress', 'body', $offset);
my $chunk = $self->content->get_body_chunk($offset);
return $chunk if !defined $chunk || length $chunk;
$self->finish;
return $chunk;
}
sub get_header_chunk {
my ($self, $offset) = @_;
$self->emit('progress', 'headers', $offset);
return $self->fix_headers->content->get_header_chunk($offset);
}
sub get_start_line_chunk {
croak 'Method "get_start_line_chunk" not implemented by subclass';
}
sub header_size { shift->fix_headers->content->header_size }
sub headers { shift->content->headers }
sub is_finished { (shift->{state} // '') eq 'finished' }
sub is_limit_exceeded { !!shift->{limit} }
sub json {
my ($self, $pointer) = @_;
return undef if $self->content->is_multipart;
my $data = $self->{json} ||= Mojo::JSON->new->decode($self->body);
return $pointer ? Mojo::JSON::Pointer->new->get($data, $pointer) : $data;
}
sub param { shift->body_params->param(@_) }
sub parse {
my ($self, $chunk) = @_;
# Check message size
return $self->_limit('Maximum message size exceeded', 413)
if ($self->{raw_size} += length($chunk //= '')) > $self->max_message_size;
$self->{buffer} .= $chunk;
# Start line
unless ($self->{state}) {
# Check line size
my $len = index $self->{buffer}, "\x0a";
$len = length $self->{buffer} if $len < 0;
return $self->_limit('Maximum line size exceeded', 431)
if $len > $self->max_line_size;
$self->{state} = 'content' if $self->extract_start_line(\$self->{buffer});
}
# Content
my $state = $self->{state} // '';
$self->content($self->content->parse(delete $self->{buffer}))
if $state eq 'content' || $state eq 'finished';
# Check line size
return $self->_limit('Maximum line size exceeded', 431)
if $self->headers->is_limit_exceeded;
# Check buffer size
return $self->error('Maximum buffer size exceeded', 400)
if $self->content->is_limit_exceeded;
return $self->emit('progress')->content->is_finished ? $self->finish : $self;
}
sub start_line_size { length shift->build_start_line }
sub to_string {
my $self = shift;
return $self->build_start_line . $self->build_headers . $self->build_body;
}
sub upload { shift->_cache(uploads => @_) }
sub uploads {
my $self = shift;
my @uploads;
for my $data (@{$self->_parse_formdata}) {
# Just a form value
next unless defined $data->[1];
# Uploaded file
my $upload = Mojo::Upload->new(
name => $data->[0],
filename => $data->[1],
asset => $data->[2]->asset,
headers => $data->[2]->headers
);
push @uploads, $upload;
}
return \@uploads;
}
sub _build {
my ($self, $method) = @_;
my $buffer = '';
my $offset = 0;
while (1) {
# No chunk yet, try again
next unless defined(my $chunk = $self->$method($offset));
# End of part
last unless my $len = length $chunk;
$offset += $len;
$buffer .= $chunk;
}
return $buffer;
}
sub _cache {
my ($self, $method, $name) = @_;
# Cache objects by name
unless ($self->{$method}) {
$self->{$method} = {};
push @{$self->{$method}{$_->name}}, $_ for @{$self->$method};
}
return unless my $objects = $self->{$method}{$name};
return wantarray ? @$objects : $objects->[0];
}
sub _limit {
my $self = shift;
$self->{limit} = 1;
$self->error(@_);
}
sub _parse_formdata {
my $self = shift;
# Check for multipart content
my @formdata;
my $content = $self->content;
return \@formdata unless $content->is_multipart;
my $charset = $content->charset || $self->default_charset;
# Check all parts for form data
my @parts = ($content);
while (my $part = shift @parts) {
# Nested multipart content
if ($part->is_multipart) {
unshift @parts, @{$part->parts};
next;
}
# Extract information from Content-Disposition header
next unless my $disposition = $part->headers->content_disposition;
my ($name) = $disposition =~ /[; ]name="?([^";]+)"?/;
my ($filename) = $disposition =~ /[; ]filename="?([^"]*)"?/;
if ($charset) {
$name = decode($charset, $name) // $name if $name;
$filename = decode($charset, $filename) // $filename if $filename;
}
# Check for file upload
my $value = $part;
unless (defined $filename) {
$value = $part->asset->slurp;
$value = decode($charset, $value) // $value if $charset;
}
push @formdata, [$name, $filename, $value];
}
return \@formdata;
}
1;
=head1 NAME
Mojo::Message - HTTP message base class
=head1 SYNOPSIS
package Mojo::Message::MyMessage;
use Mojo::Base 'Mojo::Message';
sub cookies {...}
sub extract_start_line {...}
sub get_start_line_chunk {...}
=head1 DESCRIPTION
L<Mojo::Message> is an abstract base class for HTTP messages as described in
RFC 2616 and RFC 2388.
=head1 EVENTS
L<Mojo::Message> inherits all events from L<Mojo::EventEmitter> and can emit
the following new ones.
=head2 finish
$msg->on(finish => sub {
my $msg = shift;
...
});
Emitted after message building or parsing is finished.
my $before = time;
$msg->on(finish => sub {
my $msg = shift;
$msg->headers->header('X-Parser-Time' => time - $before);
});
=head2 progress
$msg->on(progress => sub {
my $msg = shift;
...
});
Emitted when message building or parsing makes progress.
# Building
$msg->on(progress => sub {
my ($msg, $state, $offset) = @_;
say qq{Building "$state" at offset $offset};
});
# Parsing
$msg->on(progress => sub {
my $msg = shift;
return unless my $len = $msg->headers->content_length;
my $size = $msg->content->progress;
say 'Progress: ', $size == $len ? 100 : int($size / ($len / 100)), '%';
});
=head1 ATTRIBUTES
L<Mojo::Message> implements the following attributes.
=head2 content
my $msg = $msg->content;
$msg = $msg->content(Mojo::Content::Single->new);
Message content, defaults to a L<Mojo::Content::Single> object.
=head2 default_charset
my $charset = $msg->default_charset;
$msg = $msg->default_charset('UTF-8');
Default charset used for form data parsing, defaults to C<UTF-8>.
=head2 max_line_size
my $size = $msg->max_line_size;
$msg = $msg->max_line_size(1024);
Maximum start line size in bytes, defaults to the value of the
MOJO_MAX_LINE_SIZE environment variable or C<10240>.
=head2 max_message_size
my $size = $msg->max_message_size;
$msg = $msg->max_message_size(1024);
Maximum message size in bytes, defaults to the value of the
MOJO_MAX_MESSAGE_SIZE environment variable or C<5242880>. Note that increasing
this value can also drastically increase memory usage, should you for example
attempt to parse an excessively large message body with the C<body_params>,
C<dom> or C<json> methods.
=head2 version
my $version = $msg->version;
$msg = $msg->version('1.1');
HTTP version of message, defaults to C<1.1>.
=head1 METHODS
L<Mojo::Message> inherits all methods from L<Mojo::EventEmitter> and
implements the following new ones.
=head2 body
my $bytes = $msg->body;
$msg = $msg->body('Hello!');
Slurp or replace C<content>.
=head2 body_params
my $params = $msg->body_params;
C<POST> parameters extracted from C<x-application-urlencoded>,
C<application/x-www-form-urlencoded> or C<multipart/form-data> message body,
usually a L<Mojo::Parameters> object. Note that this method caches all data,
so it should not be called before the entire message body has been received.
# Get POST parameter value
say $msg->body_params->param('foo');
=head2 body_size
my $size = $msg->body_size;
Content size in bytes.
=head2 build_body
my $bytes = $msg->build_body;
Render whole body.
=head2 build_headers
my $bytes = $msg->build_headers;
Render all headers.
=head2 build_start_line
my $bytes = $msg->build_start_line;
Render start line.
=head2 cookie
my $cookie = $msg->cookie('foo');
my @cookies = $msg->cookie('foo');
Access message cookies, usually L<Mojo::Cookie::Request> or
L<Mojo::Cookie::Response> objects. Note that this method caches all data, so
it should not be called before all headers have been received.
# Get cookie value
say $msg->cookie('foo')->value;
=head2 cookies
my $cookies = $msg->cookies;
Access message cookies. Meant to be overloaded in a subclass.
=head2 dom
my $dom = $msg->dom;
my $collection = $msg->dom('a[href]');
Turns message body into a L<Mojo::DOM> object and takes an optional selector
to perform a C<find> on it right away, which returns a L<Mojo::Collection>
object. Note that this method caches all data, so it should not be called
before the entire message body has been received.
# Perform "find" right away
say $msg->dom('h1, h2, h3')->pluck('text');
# Use everything else Mojo::DOM has to offer
say $msg->dom->at('title')->text;
say $msg->dom->html->body->children->pluck('type')->uniq;
=head2 error
my $err = $msg->error;
my ($err, $code) = $msg->error;
$msg = $msg->error('Parser error');
$msg = $msg->error('Parser error', 500);
Error and code.
=head2 extract_start_line
my $success = $msg->extract_start_line(\$str);
Extract start line from string. Meant to be overloaded in a subclass.
=head2 finish
$msg = $msg->finish;
Finish message parser/generator.
=head2 fix_headers
$msg = $msg->fix_headers;
Make sure message has all required headers.
=head2 get_body_chunk
my $bytes = $msg->get_body_chunk($offset);
Get a chunk of body data starting from a specific position.
=head2 get_header_chunk
my $bytes = $msg->get_header_chunk($offset);
Get a chunk of header data, starting from a specific position.
=head2 get_start_line_chunk
my $bytes = $msg->get_start_line_chunk($offset);
Get a chunk of start line data starting from a specific position. Meant to be
overloaded in a subclass.
=head2 header_size
my $size = $msg->header_size;
Size of headers in bytes.
=head2 headers
my $headers = $msg->headers;
Message headers, usually a L<Mojo::Headers> object.
=head2 is_finished
my $success = $msg->is_finished;
Check if message parser/generator is finished.
=head2 is_limit_exceeded
my $success = $msg->is_limit_exceeded;
Check if message has exceeded C<max_line_size> or C<max_message_size>.
=head2 json
my $hash = $msg->json;
my $array = $msg->json;
my $value = $msg->json('/foo/bar');
Decode JSON message body directly using L<Mojo::JSON> if possible, returns
C<undef> otherwise. An optional JSON Pointer can be used to extract a specific
value with L<Mojo::JSON::Pointer>. Note that this method caches all data, so
it should not be called before the entire message body has been received.
# Extract JSON values
say $msg->json->{foo}{bar}[23];
say $msg->json('/foo/bar/23');
=head2 param
my @names = $msg->param;
my $foo = $msg->param('foo');
my @foo = $msg->param('foo');
Access C<POST> parameters. Note that this method caches all data, so it should
not be called before the entire message body has been received.
=head2 parse
$msg = $msg->parse('HTTP/1.1 200 OK...');
Parse message chunk.
=head2 start_line_size
my $size = $msg->start_line_size;
Size of the start line in bytes.
=head2 to_string
my $str = $msg->to_string;
Render whole message.
=head2 upload
my $upload = $msg->upload('foo');
my @uploads = $msg->upload('foo');
Access C<multipart/form-data> file uploads, usually L<Mojo::Upload> objects.
Note that this method caches all data, so it should not be called before the
entire message body has been received.
# Get content of uploaded file
say $msg->upload('foo')->asset->slurp;
=head2 uploads
my $uploads = $msg->uploads;
All C<multipart/form-data> file uploads, usually L<Mojo::Upload> objects.
=head1 SEE ALSO
L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicio.us>.
=cut