package LWP::Protocol::http10;
use strict;
require HTTP::Response;
require HTTP::Status;
require IO::Socket;
require IO::Select;
use vars qw(@ISA @EXTRA_SOCK_OPTS);
require LWP::Protocol;
@ISA = qw(LWP::Protocol);
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,
                                     $self->_extra_sock_opts($host, $port),
                                    );
    unless ($sock) {
        # IO::Socket::INET leaves additional error messages in $@
        $@ =~ s/^.*?: //;
        die "Can't connect to $host:$port ($@)";
    }
    $sock;
}
sub _extra_sock_opts  # to be overridden by subclass
{
    return @EXTRA_SOCK_OPTS;
}
sub _check_sock
{
    #my($self, $req, $sock) = @_;
}
sub _get_sock_info
{
    my($self, $res, $sock) = @_;
    if (defined(my $peerhost = $sock->peerhost)) {
        $res->header("Client-Peer" => "$peerhost:" . $sock->peerport);
    }
}
sub _fixup_header
{
    my($self, $h, $url, $proxy) = @_;
    $h->remove_header('Connection');  # need support here to be useful
    # HTTP/1.1 will require us to send the 'Host' header, so we might
    # as well start now.
    my $hhost = $url->authority;
    if ($hhost =~ s/^([^\@]*)\@//) {  # get rid of potential "user:pass@"
        # 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')) {
            require URI::Escape;
            $h->authorization_basic(map URI::Escape::uri_unescape($_),
                                    split(":", $1, 2));
        }
    }
    $h->init_header('Host' => $hhost);
    if ($proxy) {
        # Check the proxy URI's userinfo() for proxy credentials
        # export http_proxy="http://proxyuser:proxypass@proxyhost:port"
        my $p_auth = $proxy->userinfo();
        if(defined $p_auth) {
            require URI::Escape;
            $h->proxy_authorization_basic(map URI::Escape::uri_unescape($_),
                                          split(":", $p_auth, 2))
        }
    }
}
sub request
{
    my($self, $request, $proxy, $arg, $size, $timeout) = @_;
    $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 = $method eq "CONNECT" ?
                       ($url->host . ":" . $url->port) :
                       $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($$cont_ref);
    }
    $self->_fixup_header($h, $url, $proxy);
    my $buf = $request_line . $h->as_string($CRLF) . $CRLF;
    my $n;  # used for return value from syswrite/sysread
    my $length;
    my $offset;
    # syswrite $buf
    $length = length($buf);
    $offset = 0;
    while ( $offset < $length ) {
        die "write timeout" if $timeout && !$sel->can_write($timeout);
        $n = $socket->syswrite($buf, $length-$offset, $offset );
        die $! unless defined($n);
        $offset += $n;
    }
    if ($ctype eq 'CODE') {
        while ( ($buf = &$cont_ref()), defined($buf) && length($buf)) {
            # syswrite $buf
            $length = length($buf);
            $offset = 0;
            while ( $offset < $length ) {
                die "write timeout" if $timeout && !$sel->can_write($timeout);
                $n = $socket->syswrite($buf, $length-$offset, $offset );
                die $! unless defined($n);
                $offset += $n;
            }
        }
    }
    elsif (defined($$cont_ref) && length($$cont_ref)) {
        # syswrite $$cont_ref
        $length = length($$cont_ref);
        $offset = 0;
        while ( $offset < $length ) {
            die "write timeout" if $timeout && !$sel->can_write($timeout);
            $n = $socket->syswrite($$cont_ref, $length-$offset, $offset );
            die $! unless defined($n);
            $offset += $n;
        }
    }
    # read response line from server
    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 $n;
        if ($buf =~ s/^(HTTP\/\d+\.\d+)[ \t]+(\d+)[ \t]*([^\012]*)\012//) {
            # HTTP/1.0 response or better
            my($ver,$code,$msg) = ($1, $2, $3);
            $msg =~ s/\015$//;
            $response = HTTP::Response->new($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...
                die "read timeout" if $timeout && !$sel->can_read($timeout);
                my $old_len = length($buf);
                $n = $socket->sysread($buf, $size, $old_len);
                die $! unless defined($n);
                die "unexpected EOF before all headers seen" unless $n;
            }
            # now we start parsing the headers.  The strategy is to
            # remove one line at a time from the beginning of the header
            # buffer ($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+(.*)/ && $key) {
                    $val .= " $1";
                }
                else {
                    $response->push_header("Client-Bad-Header-Line" => $line);
                }
            }
            $response->push_header($key, $val) if $key;
            last;
        }
        elsif ((length($buf) >= 5 and $buf !~ /^HTTP\//) or
               $buf =~ /\012/ ) {
            # HTTP/0.9 or worse
            $response = HTTP::Response->new(&HTTP::Status::RC_OK, "OK");
            $response->protocol('HTTP/0.9');
            last;
        }
        else {
            # need more data
        }
    };
    $response->request($request);
    $self->_get_sock_info($response, $socket);
    if ($method eq "CONNECT") {
        $response->{client_socket} = $socket;  # so it can be picked up
        $response->content($buf);     # in case we read more than the headers
        return $response;
    }
    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);
        return \$buf;
        } );
    #$socket->close;
    $response;
}
1;