package Mojo::Message;
use Mojo::Base 'Mojo::EventEmitter';
use Carp 'croak';
use Mojo::Asset::Memory;
use Mojo::Content::Single;
use Mojo::DOM;
use Mojo::JSON 'j';
use Mojo::JSON::Pointer;
use Mojo::Parameters;
use Mojo::Upload;
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} || 8192 };
has max_message_size => sub { $ENV{MOJO_MAX_MESSAGE_SIZE} // 16777216 };
has version => '1.1';
sub body {
my $self = shift;
# Get
my $content = $self->content;
return $content->is_multipart ? '' : $content->asset->slurp unless @_;
# Set (multipart content needs to be downgraded)
$content = $self->content(Mojo::Content::Single->new)->content
if $content->is_multipart;
$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);
# "application/x-www-form-urlencoded"
my $type = $self->headers->content_type // '';
if ($type =~ m!application/x-www-form-urlencoded!i) {
$params->parse($self->content->asset->slurp);
}
# "multipart/form-data"
elsif ($type =~ m!multipart/form-data!i) {
$params->append(@$_[0, 1]) for @{$self->_parse_formdata};
}
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', 0, @_) }
sub cookies { croak 'Method "cookies" not implemented by subclass' }
sub dom {
my $self = shift;
return undef if $self->content->is_multipart;
my $dom = $self->{dom} ||= Mojo::DOM->new($self->text);
return @_ ? $dom->find(@_) : $dom;
}
sub error {
my $self = shift;
return $self->{error} unless @_;
$self->{error} = shift;
return $self->finish;
}
sub every_cookie { shift->_cache('cookies', 1, @_) }
sub every_upload { shift->_cache('uploads', 1, @_) }
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;
return $self if $self->{fix}++;
# Content-Length or Connection (unless chunked transfer encoding is used)
my $content = $self->content;
my $headers = $content->headers;
if ($content->is_multipart) { $headers->remove('Content-Length') }
elsif ($content->is_chunked || $headers->content_length) { return $self }
if ($content->is_dynamic) { $headers->connection('close') }
else { $headers->content_length($self->body_size) }
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 = $self->{json} //= j($self->body);
return $pointer ? Mojo::JSON::Pointer->new($data)->get($pointer) : $data;
}
sub parse {
my ($self, $chunk) = @_;
return $self if $self->{error};
$self->{raw_size} += length $chunk;
$self->{buffer} .= $chunk;
# Start-line
unless ($self->{state}) {
# Check start-line size
my $len = index $self->{buffer}, "\x0a";
$len = length $self->{buffer} if $len < 0;
return $self->_limit('Maximum start-line size exceeded')
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 message size
my $max = $self->max_message_size;
return $self->_limit('Maximum message size exceeded')
if $max && $max < $self->{raw_size};
# Check header size
return $self->_limit('Maximum header size exceeded')
if $self->headers->is_limit_exceeded;
# Check buffer size
return $self->_limit('Maximum buffer size exceeded')
if $self->content->is_limit_exceeded;
return $self->emit('progress')->content->is_finished ? $self->finish : $self;
}
sub start_line_size {
croak 'Method "start_line_size" not implemented by subclass';
}
sub text {
my $self = shift;
my $body = $self->body;
my $charset = $self->content->charset || $self->default_charset;
return $charset ? decode($charset, $body) // $body : $body;
}
sub to_string {
my $self = shift;
return $self->build_start_line . $self->build_headers . $self->build_body;
}
sub upload { shift->_cache('uploads', 0, @_) }
sub uploads {
my $self = shift;
my @uploads;
for my $data (@{$self->_parse_formdata(1)}) {
my $upload = Mojo::Upload->new(
name => $data->[0],
filename => $data->[2],
asset => $data->[1]->asset,
headers => $data->[1]->headers
);
push @uploads, $upload;
}
return \@uploads;
}
sub _build {
my ($self, $method) = @_;
my ($buffer, $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, $all, $name) = @_;
# Cache objects by name
unless ($self->{$method}) {
$self->{$method} = {};
push @{$self->{$method}{$_->name}}, $_ for @{$self->$method};
}
my $objects = $self->{$method}{$name} || [];
return $all ? $objects : $objects->[-1];
}
sub _limit { ++$_[0]{limit} and return $_[0]->error({message => $_[1]}) }
sub _parse_formdata {
my ($self, $upload) = @_;
my @formdata;
my $content = $self->content;
return \@formdata unless $content->is_multipart;
my $charset = $content->charset || $self->default_charset;
# Check all parts recursively
my @parts = ($content);
while (my $part = shift @parts) {
if ($part->is_multipart) {
unshift @parts, @{$part->parts};
next;
}
next unless my $disposition = $part->headers->content_disposition;
my ($filename) = $disposition =~ /[; ]filename="((?:\\"|[^"])*)"/;
next if $upload && !defined $filename || !$upload && defined $filename;
my ($name) = $disposition =~ /[; ]name="((?:\\"|[^;"])*)"/;
$part = $part->asset->slurp unless $upload;
if ($charset) {
$name = decode($charset, $name) // $name if $name;
$filename = decode($charset, $filename) // $filename if $filename;
$part = decode($charset, $part) // $part unless $upload;
}
push @formdata, [$name, $part, $filename];
}
return \@formdata;
}
1;
=encoding utf8
=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 {...}
sub start_line_size {...}
=head1 DESCRIPTION
L<Mojo::Message> is an abstract base class for HTTP message containers, based on
L<RFC 7230|http://tools.ietf.org/html/rfc7230>,
L<RFC 7231|http://tools.ietf.org/html/rfc7231> and
L<RFC 2388|http://tools.ietf.org/html/rfc2388>, like L<Mojo::Message::Request>
and L<Mojo::Message::Response>.
=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 by L</"text"> and to extract data from
C<application/x-www-form-urlencoded> or C<multipart/form-data> message body,
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
C<MOJO_MAX_LINE_SIZE> environment variable or C<8192> (8KB).
=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
C<MOJO_MAX_MESSAGE_SIZE> environment variable or C<16777216> (16MB). Setting
the value to C<0> will allow messages of indefinite size.
=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 L</"content">.
=head2 body_params
my $params = $msg->body_params;
C<POST> parameters extracted from 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. Parts of the message body need to be loaded
into memory to parse C<POST> parameters, so you have to make sure it is not
excessively large. There's a 16MB limit for requests and a 2GB limit for
responses by default.
# Get POST parameter names and values
my $hash = $msg->body_params->to_hash;
=head2 body_size
my $size = $msg->body_size;
Content size in bytes.
=head2 build_body
my $bytes = $msg->build_body;
Render whole body with L</"get_body_chunk">.
=head2 build_headers
my $bytes = $msg->build_headers;
Render all headers with L</"get_header_chunk">.
=head2 build_start_line
my $bytes = $msg->build_start_line;
Render start-line with L</"get_start_line_chunk">.
=head2 cookie
my $cookie = $msg->cookie('foo');
Access message cookies, usually L<Mojo::Cookie::Request> or
L<Mojo::Cookie::Response> objects. If there are multiple cookies sharing the
same name, and you want to access more than just the last one, you can use
L</"every_cookie">. 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]');
Retrieve message body from L</"text"> and turn it into a L<Mojo::DOM> object,
an optional selector can be used to call the method L<Mojo::DOM/"find"> on it
right away, which then 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. The whole message body needs to be loaded into memory
to parse it, so you have to make sure it is not excessively large. There's a
16MB limit for requests and a 2GB limit for responses by default.
# Perform "find" right away
say $msg->dom('h1, h2, h3')->map('text')->join("\n");
# Use everything else Mojo::DOM has to offer
say $msg->dom->at('title')->text;
say $msg->dom->at('body')->children->map('tag')->uniq->join("\n");
=head2 error
my $err = $msg->error;
$msg = $msg->error({message => 'Parser error'});
Get or set message error, an C<undef> return value indicates that there is no
error.
# Connection or parser error
$msg->error({message => 'Connection refused'});
# 4xx/5xx response
$msg->error({message => 'Internal Server Error', code => 500});
=head2 every_cookie
my $cookies = $msg->every_cookie('foo');
Similar to L</"cookie">, but returns all message cookies sharing the same name
as an array reference.
# Get first cookie value
say $msg->every_cookie('foo')->[0]->value;
=head2 every_upload
my $uploads = $msg->every_upload('foo');
Similar to L</"upload">, but returns all file uploads sharing the same name as
an array reference.
# Get content of first uploaded file
say $msg->every_upload('foo')->[0]->asset->slurp;
=head2 extract_start_line
my $bool = $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. Note that it might
not be possible to get the same chunk twice if content was generated
dynamically.
=head2 get_header_chunk
my $bytes = $msg->get_header_chunk($offset);
Get a chunk of header data, starting from a specific position. Note that this
method finalizes the message.
=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. Note that this method finalizes the message.
=head2 headers
my $headers = $msg->headers;
Message headers, usually a L<Mojo::Headers> object.
# Longer version
my $headers = $msg->content->headers;
=head2 is_finished
my $bool = $msg->is_finished;
Check if message parser/generator is finished.
=head2 is_limit_exceeded
my $bool = $msg->is_limit_exceeded;
Check if message has exceeded L</"max_line_size">, L</"max_message_size">,
L<Mojo::Content/"max_buffer_size"> or L<Mojo::Headers/"max_line_size">.
=head2 json
my $value = $msg->json;
my $value = $msg->json('/foo/bar');
Decode JSON message body directly using L<Mojo::JSON> if possible, an C<undef>
return value indicates a bare C<null> or that decoding failed. 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. The whole message body needs to be
loaded into memory to parse it, so you have to make sure it is not excessively
large. There's a 16MB limit for requests and a 2GB limit for responses by
default.
# Extract JSON values
say $msg->json->{foo}{bar}[23];
say $msg->json('/foo/bar/23');
=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. Meant to be overloaded in a subclass.
=head2 text
my $str = $msg->text;
Retrieve L</"body"> and try to decode it with L<Mojo::Content/"charset"> or
L</"default_charset">.
=head2 to_string
my $str = $msg->to_string;
Render whole message. Note that this method finalizes the message, and that it
might not be possible to render the same message twice if content was generated
dynamically.
=head2 upload
my $upload = $msg->upload('foo');
Access C<multipart/form-data> file uploads, usually L<Mojo::Upload> objects. If
there are multiple uploads sharing the same name, and you want to access more
than just the last one, you can use L</"every_upload">. 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.
# Names of all uploads
say $_->name for @{$msg->uploads};
=head1 SEE ALSO
L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicious.org>.
=cut