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/homepage/v-mt/extlib/LWP/Simple.pm
# # $Id: Simple.pm,v 1.35 2001/07/21 03:09:10 gisle Exp $ =head1 NAME get, head, getprint, getstore, mirror - Procedural LWP interface =head1 SYNOPSIS perl -MLWP::Simple -e 'getprint "http://www.sn.no"' use LWP::Simple; $content = get("http://www.sn.no/") if (mirror("http://www.sn.no/", "foo") == RC_NOT_MODIFIED) { ... } if (is_success(getprint("http://www.sn.no/"))) { ... } =head1 DESCRIPTION This interface is intended for those who want a simplified view of the libwww-perl library. It should also be suitable for one-liners. If you need more control or access to the header fields in the requests sent and responses received you should use the full object oriented interface provided by the C<LWP::UserAgent> module. The following functions are provided (and exported) by this module: =over 3 =item get($url) The get() function will fetch the document identified by the given URL and return it. It returns C<undef> if it fails. The $url argument can be either a simple string or a reference to a URI object. You will not be able to examine the response code or response headers (like 'Content-Type') when you are accessing the web using this function. If you need that information you should use the full OO interface (see L<LWP::UserAgent>). =item head($url) Get document headers. Returns the following 5 values if successful: ($content_type, $document_length, $modified_time, $expires, $server) Returns an empty list if it fails. In scalar context returns TRUE if successful. =item getprint($url) Get and print a document identified by a URL. The document is printed to STDOUT as data is received from the network. If the request fails, then the status code and message are printed on STDERR. The return value is the HTTP response code. =item getstore($url, $file) Gets a document identified by a URL and stores it in the file. The return value is the HTTP response code. =item mirror($url, $file) Get and store a document identified by a URL, using I<If-modified-since>, and checking the I<Content-Length>. Returns the HTTP response code. =back This module also exports the HTTP::Status constants and procedures. These can be used when you check the response code from getprint(), getstore() and mirror(). The constants are: RC_CONTINUE RC_SWITCHING_PROTOCOLS RC_OK RC_CREATED RC_ACCEPTED RC_NON_AUTHORITATIVE_INFORMATION RC_NO_CONTENT RC_RESET_CONTENT RC_PARTIAL_CONTENT RC_MULTIPLE_CHOICES RC_MOVED_PERMANENTLY RC_MOVED_TEMPORARILY RC_SEE_OTHER RC_NOT_MODIFIED RC_USE_PROXY RC_BAD_REQUEST RC_UNAUTHORIZED RC_PAYMENT_REQUIRED RC_FORBIDDEN RC_NOT_FOUND RC_METHOD_NOT_ALLOWED RC_NOT_ACCEPTABLE RC_PROXY_AUTHENTICATION_REQUIRED RC_REQUEST_TIMEOUT RC_CONFLICT RC_GONE RC_LENGTH_REQUIRED RC_PRECONDITION_FAILED RC_REQUEST_ENTITY_TOO_LARGE RC_REQUEST_URI_TOO_LARGE RC_UNSUPPORTED_MEDIA_TYPE RC_INTERNAL_SERVER_ERROR RC_NOT_IMPLEMENTED RC_BAD_GATEWAY RC_SERVICE_UNAVAILABLE RC_GATEWAY_TIMEOUT RC_HTTP_VERSION_NOT_SUPPORTED The HTTP::Status classification functions are: =over 3 =item is_success($rc) True if response code indicated a successful request. =item is_error($rc) True if response code indicated that an error occured. =back The module will also export the LWP::UserAgent object as C<$ua> if you ask for it explicitly. The user agent created by this module will identify itself as "LWP::Simple/#.##" (where "#.##" is the libwww-perl version number) and will initialize its proxy defaults from the environment (by calling $ua->env_proxy). =head1 SEE ALSO L<LWP>, L<LWP::UserAgent>, L<HTTP::Status>, L<lwp-request>, L<lwp-mirror> =cut package LWP::Simple; use strict; use vars qw($ua %loop_check $FULL_LWP @EXPORT @EXPORT_OK $VERSION); require Exporter; @EXPORT = qw(get head getprint getstore mirror); @EXPORT_OK = qw($ua); # I really hate this. I was a bad idea to do it in the first place. # Wonder how to get rid of it??? (It even makes LWP::Simple 7% slower # for trivial tests) use HTTP::Status; push(@EXPORT, @HTTP::Status::EXPORT); $VERSION = sprintf("%d.%02d", q$Revision: 1.35 $ =~ /(\d+)\.(\d+)/); $FULL_LWP++ if grep {lc($_) eq "http_proxy"} keys %ENV; sub import { my $pkg = shift; my $callpkg = caller; if (grep $_ eq '$ua', @_) { $FULL_LWP++; _init_ua(); } Exporter::export($pkg, $callpkg, @_); } sub _init_ua { require LWP; require LWP::UserAgent; require HTTP::Status; require HTTP::Date; $ua = new LWP::UserAgent; # we create a global UserAgent object my $ver = $LWP::VERSION = $LWP::VERSION; # avoid warning $ua->agent("LWP::Simple/$LWP::VERSION"); $ua->env_proxy; } sub get ($) { %loop_check = (); goto \&_get; } sub get_old ($) { my($url) = @_; _init_ua() unless $ua; my $request = HTTP::Request->new(GET => $url); my $response = $ua->request($request); return $response->content if $response->is_success; return undef; } sub head ($) { my($url) = @_; _init_ua() unless $ua; my $request = HTTP::Request->new(HEAD => $url); my $response = $ua->request($request); if ($response->is_success) { return $response unless wantarray; return (scalar $response->header('Content-Type'), scalar $response->header('Content-Length'), HTTP::Date::str2time($response->header('Last-Modified')), HTTP::Date::str2time($response->header('Expires')), scalar $response->header('Server'), ); } return; } sub getprint ($) { my($url) = @_; _init_ua() unless $ua; my $request = HTTP::Request->new(GET => $url); local($\) = ""; # ensure standard $OUTPUT_RECORD_SEPARATOR my $callback = sub { print $_[0] }; if ($^O eq "MacOS") { $callback = sub { $_[0] =~ s/\015?\012/\n/g; print $_[0] } } my $response = $ua->request($request, $callback); unless ($response->is_success) { print STDERR $response->status_line, " <URL:$url>\n"; } $response->code; } sub getstore ($$) { my($url, $file) = @_; _init_ua() unless $ua; my $request = HTTP::Request->new(GET => $url); my $response = $ua->request($request, $file); $response->code; } sub mirror ($$) { my($url, $file) = @_; _init_ua() unless $ua; my $response = $ua->mirror($url, $file); $response->code; } sub _get { my $url = shift; my $ret; if (!$FULL_LWP && $url =~ m,^http://([^/:\@]+)(?::(\d+))?(/\S*)?$,) { my $host = $1; my $port = $2 || 80; my $path = $3; $path = "/" unless defined($path); return _trivial_http_get($host, $port, $path); } else { _init_ua() unless $ua; if (@_ && $url !~ /^\w+:/) { # non-absolute redirect from &_trivial_http_get my($host, $port, $path) = @_; require URI; $url = URI->new_abs($url, "http://$host:$port$path"); } my $request = HTTP::Request->new(GET => $url); my $response = $ua->request($request); return $response->is_success ? $response->content : undef; } } sub _trivial_http_get { my($host, $port, $path) = @_; #print "HOST=$host, PORT=$port, PATH=$path\n"; require IO::Socket; local($^W) = 0; my $sock = IO::Socket::INET->new(PeerAddr => $host, PeerPort => $port, Proto => 'tcp', Timeout => 60) || return undef; $sock->autoflush; my $netloc = $host; $netloc .= ":$port" if $port != 80; print $sock join("\015\012" => "GET $path HTTP/1.0", "Host: $netloc", "User-Agent: lwp-trivial/$VERSION", "", ""); my $buf = ""; my $n; 1 while $n = sysread($sock, $buf, 8*1024, length($buf)); return undef unless defined($n); if ($buf =~ m,^HTTP/\d+\.\d+\s+(\d+)[^\012]*\012,) { my $code = $1; #print "CODE=$code\n$buf\n"; if ($code =~ /^30[1237]/ && $buf =~ /\012Location:\s*(\S+)/) { # redirect my $url = $1; return undef if $loop_check{$url}++; return _get($url, $host, $port, $path); } return undef unless $code =~ /^2/; $buf =~ s/.+?\015?\012\015?\012//s; # zap header } return $buf; } 1;