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Sunday, 10 April 2016

“简单的翻墙术－一个基于perl的脚本”的升级版

这几天做了个可以偶尔用用的版本——说偶尔用用是因为bug还不少。而且我没有在代码中增加SSL支持，因此经常会被GFW切断，不过反正说了是偶尔用用就无所谓了。最主要的是因为自己没有需求，做这个东西只是练手，试用POE，虽然到最后麻烦点落到了操作DOM，HTML里面能写链接的地方还真不少啊，得一个一个改。
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#!/usr/bin/perl
use warnings;
use strict;
use Data::Dumper;
use POE;
use POE::Component::Server::TCP;
use POE::Filter::HTTPD;
use POE::Filter::Stream;
use HTTP::Response;
use HTML::TreeBuilder;
use URI;
use LWP::UserAgent;
 
my $base_domain = '.icylife.net:8443';
 
POE::Component::Server::TCP->new( Port => 8443,
                                ClientFilter => 'POE::Filter::HTTPD',
                                ClientInput => \&handle_http_request,
                        );
 
POE::Kernel->run();
exit( );
 
sub replace_link
{
        my $dom_item = shift;
        my $attr_name = shift;
        my $base_url = shift;
 
        if( !defined($dom_item) || !defined($attr_name) || !defined($base_url) || !defined($dom_item->attr($attr_name)) )
        {
                return;
        }
 
        my $uri = URI->new( $dom_item->attr($attr_name) );
 
        $uri = $uri->abs($base_url);
        $uri->host($uri->host.$base_domain);
        $dom_item->attr($attr_name, $uri->as_string);
}
 
sub process_html
{
        my $html = shift;
        my $base_url = shift;
 
        my $root = HTML::TreeBuilder->new;
        $root->no_space_compacting( 1 );
        $root->ignore_ignorable_whitespace( 0 );
 
        $html =~ s/ / /g;
        $root->parse_content( $html );
        #$root->dump;
 
        # handle links
        my @links = $root->look_down( _tag=>'a', sub{ defined($_[0]->attr('href')) } );
        foreach my $link( @links )
        {
                my $old_link = $link->attr('href');
                if( $old_link =~ /^http:\/\// && defined($old_link) && $old_link !~ /^javascript:/ && $old_link !~ /^mailto:/ && $old_link !~ /^#/ )
                {
                        replace_link( $link, 'href', $base_url );
                }
        }
 
        my @csss = $root->look_down( _tag=>'link', sub{ defined($_[0]->attr('href')) } );
        foreach my $css( @csss )
        {
                replace_link( $css, 'href', $base_url );
        }
 
        my @jss = $root->look_down( _tag=>'script', sub{ defined($_[0]->attr('src')) } );
        foreach my $js( @jss )
        {
                replace_link( $js, 'src', $base_url );
        }
 
        my @pics = $root->look_down( _tag=>'img', sub{ defined($_[0]->attr('src')) } );
        foreach my $pic( @pics )
        {
                replace_link( $pic, 'src', $base_url );
        }
 
        my @forms = $root->look_down( _tag=>'form', sub{ defined($_[0]->attr('action')) } );
        foreach my $form( @forms )
        {
                replace_link( $form, 'action', $base_url );
        }
 
        my $new_html = $root->as_HTML( '' );
        $root->delete;
 
        #$new_html =~ s!^<body>\n?!!;
        #$new_html =~ s!</body>\s*\z!!;
 
        return $new_html;
}
 
sub handle_http_response
{
        my $kernel = shift;
        my $heap = shift;
        my $response = shift;
 
        my $response_header = $response->{_headers};
        my $response_data = $response->content;
 
        $heap->{client}->set_output_filter(POE::Filter::Stream->new());
 
        if( lc($response_header->header('Content-Type')) =~ /text\/html/ )
        {
                $response_data = process_html( $response_data, $response->request->uri );
        }
        $response->{_content} = $response_data;
        delete $response->{_request};
 
        $heap->{client}->put($response->as_string);
 
        print "sent ".length($response_data)." bytes\n";
 
        $kernel->yield("shutdown");
}
 
sub handle_http_request
{
        my ( $kernel, $heap, $request ) = @_[ KERNEL, HEAP, ARG0 ];
 
        if ( $request->isa("HTTP::Response") )
        {
                $heap->{client}->put($request);
                $kernel->yield("shutdown");
 
                return;
        }
 
        my $new_host = $request->header( "host" );
        $new_host =~ s/\.icylife\.net:8443//g;
        $request->header( "host", $new_host );
 
        $request->uri( "http://$new_host".$request->uri );
        $request->header("Connection", "close");
        $request->header("Proxy-Connection", "close");
        $request->remove_header("Keep-Alive");
        $request->remove_header("Accept-Encoding");
 
        print "access ".$request->uri->as_string."\n";
 
        my $ua = LWP::UserAgent->new;
        $ua->timeout(10);
 
        my $response = $ua->request( $request );
 
        handle_http_response( $kernel, $heap, $response );
}

from http://web.archive.org/web/20131028230847/http://www.icylife.net/blog/?p=865

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