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_b64aea5b0d3b3a507bd4993960dedab4
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2000-03-15
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254 lines
#
# $Id: http.pm,v 1.46 1999/03/19 22:03:10 gisle Exp $
package LWP::Protocol::http;
require LWP::Debug;
require HTTP::Response;
require HTTP::Status;
require IO::Socket;
require IO::Select;
require LWP::Protocol;
@ISA = qw(LWP::Protocol);
use strict;
my $CRLF = "\015\012"; # how lines should be terminated;
# "\r\n" is not correct on all systems, for
# instance MacPerl defines it to "\012\015"
sub _new_socket
{
my($self, $host, $port, $timeout) = @_;
local($^W) = 0; # IO::Socket::INET can be noisy
my $sock = IO::Socket::INET->new(PeerAddr => $host,
PeerPort => $port,
Proto => 'tcp',
Timeout => $timeout,
);
unless ($sock) {
# IO::Socket::INET leaves additional error messages in $@
$@ =~ s/^.*?: //;
die "Can't connect to $host:$port ($@)";
}
$sock;
}
sub _check_sock
{
#my($self, $req, $sock) = @_;
}
sub _get_sock_info
{
my($self, $res, $sock) = @_;
$res->header("Client-Peer" =>
$sock->peerhost . ":" . $sock->peerport);
}
sub request
{
my($self, $request, $proxy, $arg, $size, $timeout) = @_;
LWP::Debug::trace('()');
$size ||= 4096;
# check method
my $method = $request->method;
unless ($method =~ /^[A-Za-z0-9_!\#\$%&\'*+\-.^\`|~]+$/) { # HTTP token
return new HTTP::Response &HTTP::Status::RC_BAD_REQUEST,
'Library does not allow method ' .
"$method for 'http:' URLs";
}
my $url = $request->url;
my($host, $port, $fullpath);
# Check if we're proxy'ing
if (defined $proxy) {
# $proxy is an URL to an HTTP server which will proxy this request
$host = $proxy->host;
$port = $proxy->port;
$fullpath = $url->as_string;
}
else {
$host = $url->host;
$port = $url->port;
$fullpath = $url->path_query;
$fullpath = "/" unless length $fullpath;
}
# connect to remote site
my $socket = $self->_new_socket($host, $port, $timeout);
$self->_check_sock($request, $socket);
my $sel = IO::Select->new($socket) if $timeout;
my $request_line = "$method $fullpath HTTP/1.0$CRLF";
my $h = $request->headers->clone;
my $cont_ref = $request->content_ref;
$cont_ref = $$cont_ref if ref($$cont_ref);
my $ctype = ref($cont_ref);
# If we're sending content we *have* to specify a content length
# otherwise the server won't know a messagebody is coming.
if ($ctype eq 'CODE') {
die 'No Content-Length header for request with dynamic content'
unless defined($h->header('Content-Length')) ||
$h->content_type =~ /^multipart\//;
# For HTTP/1.1 we could have used chunked transfer encoding...
} else {
$h->header('Content-Length' => length $$cont_ref)
if defined($$cont_ref) && length($$cont_ref);
}
# HTTP/1.1 will require us to send the 'Host' header, so we might
# as well start now.
my $hhost = $url->authority;
$hhost =~ s/^([^\@]*)\@//; # get rid of potential "user:pass@"
$h->header('Host' => $hhost) unless defined $h->header('Host');
# add authorization header if we need them. HTTP URLs do
# not really support specification of user and password, but
# we allow it.
if (defined($1) && not $h->header('Authorization')) {
$h->authorization_basic(split(":", $1));
}
my $buf = $request_line . $h->as_string($CRLF) . $CRLF;
my $n; # used for return value from syswrite/sysread
die "write timeout" if $timeout && !$sel->can_write($timeout);
$n = $socket->syswrite($buf, length($buf));
die $! unless defined($n);
die "short write" unless $n == length($buf);
LWP::Debug::conns($buf);
if ($ctype eq 'CODE') {
while ( ($buf = &$cont_ref()), defined($buf) && length($buf)) {
die "write timeout" if $timeout && !$sel->can_write($timeout);
$n = $socket->syswrite($buf, length($buf));
die $! unless defined($n);
die "short write" unless $n == length($buf);
LWP::Debug::conns($buf);
}
} elsif (defined($$cont_ref) && length($$cont_ref)) {
die "write timeout" if $timeout && !$sel->can_write($timeout);
$n = $socket->syswrite($$cont_ref, length($$cont_ref));
die $! unless defined($n);
die "short write" unless $n == length($$cont_ref);
LWP::Debug::conns($buf);
}
# read response line from server
LWP::Debug::debug('reading response');
my $response;
$buf = '';
# Inside this loop we will read the response line and all headers
# found in the response.
while (1) {
{
die "read timeout" if $timeout && !$sel->can_read($timeout);
$n = $socket->sysread($buf, $size, length($buf));
die $! unless defined($n);
die "unexpected EOF before status line seen" unless $n;
LWP::Debug::conns($buf);
}
if ($buf =~ s/^(HTTP\/\d+\.\d+)[ \t]+(\d+)[ \t]*([^\012]*)\012//) {
# HTTP/1.0 response or better
my($ver,$code,$msg) = ($1, $2, $3);
$msg =~ s/\015$//;
LWP::Debug::debug("$ver $code $msg");
$response = HTTP::Response->new($code, $msg);
$response->protocol($ver);
# ensure that we have read all headers. The headers will be
# terminated by two blank lines
until ($buf =~ /^\015?\012/ || $buf =~ /\015?\012\015?\012/) {
# must read more if we can...
LWP::Debug::debug("need more header data");
die "read timeout" if $timeout && !$sel->can_read($timeout);
$n = $socket->sysread($buf, $size, length($buf));
die $! unless defined($n);
die "unexpected EOF before all headers seen" unless $n;
#LWP::Debug::conns($buf);
}
# now we start parsing the headers. The strategy is to
# remove one line at a time from the beginning of the header
# buffer ($res).
my($key, $val);
while ($buf =~ s/([^\012]*)\012//) {
my $line = $1;
# if we need to restore as content when illegal headers
# are found.
my $save = "$line\012";
$line =~ s/\015$//;
last unless length $line;
if ($line =~ /^([a-zA-Z0-9_\-.]+)\s*:\s*(.*)/) {
$response->push_header($key, $val) if $key;
($key, $val) = ($1, $2);
} elsif ($line =~ /^\s+(.*)/) {
unless ($key) {
$response->header("Client-Warning" =>
=> "Illegal continuation header");
$buf = "$save$buf";
last;
}
$val .= " $1";
} else {
$response->header("Client-Warning" =>
"Illegal header '$line'");
$buf = "$save$buf";
last;
}
}
$response->push_header($key, $val) if $key;
last;
} elsif ((length($buf) >= 5 and $buf !~ /^HTTP\//) or
$buf =~ /\012/ ) {
# HTTP/0.9 or worse
LWP::Debug::debug("HTTP/0.9 assume OK");
$response = HTTP::Response->new(&HTTP::Status::RC_OK, "OK");
$response->protocol('HTTP/0.9');
last;
} else {
# need more data
LWP::Debug::debug("need more status line data");
}
};
$response->request($request);
$self->_get_sock_info($response, $socket);
my $usebuf = length($buf) > 0;
$response = $self->collect($arg, $response, sub {
if ($usebuf) {
$usebuf = 0;
return \$buf;
}
die "read timeout" if $timeout && !$sel->can_read($timeout);
my $n = $socket->sysread($buf, $size);
die $! unless defined($n);
#LWP::Debug::conns($buf);
return \$buf;
} );
$socket->close;
$response;
}
1;