#!/usr/local/bin/perl $VERSION = "1.13"; # CGI code.pl # Version 1.13 # Part of "Cyrillic Software Suite" # Get docs and newest version from # http://www.neystadt.org/cyrillic/ # # Copyright (c) 1997-98, John Neystadt # You may install this script on your web site for free # To obtain permision for redistribution or any other usage # contact john@neystadt.org. # # Drop me a line if you deploy this script on your site. =head1 NAME code.pl v1.13 - CGI script to convert on-the-fly html pages across cyrillic charsets =cut use Convert::Cyrillic; use LWP::UserAgent; use HTTP::Headers::UserAgent; $path=".."; # <==== path from cgi-bin to the server root. $defcode="WIN"; # <==== default source encoding $maxsize=500000; # maximum file size $IndexFileName = 'index.html'; $UserAgent=$ENV{HTTP_USER_AGENT}; $scrname=$ENV{SCRIPT_NAME}; $file=$ENV{PATH_INFO}; $file=~s/^$scrname//; $file=~s/\+/ /go; $file=~s/%(..)/pack("c",hex($1))/ge; if ($file=~/[\.\/\\]([^\.\/\\]+)$/o) {$ext=lc($1);} else {$ext='html';} $file=~s%^\/([^\/]*)%%o; $lang=uc($+); if ($lang eq 'RUS') { print "Content-type: text/html\n

Select Russian encoding:

"; goto end; } if ($lang=~/(.*)-(.*)/o) { $charset=$1; $lang=$2; } if (!(',ISO,KOI8,KOI,DOS,WIN,VOL,MAC,NOCS,AUTO,' =~ /,$lang,/i)) { $err = "Unsupported code - $lang"; goto error; } $file =~ s|http:/([^/])|http://$1|oi; # Some vers of Ms-IIS merge '//' into '/' in Urls if ($file =~ s|^/(http://)|$1|oi) { $url=$ENV {'QUERY_STRING'}; if ($url) { $url= "?" . $url; } $url = $file . $url; my $ua = new LWP::UserAgent; $ua->agent("code.pl/1.2 " . $ua->agent); $ua->from ('leonid@neystadt.org'); my $req = new HTTP::Request (GET => $url); my $res = $ua->request ($req); if (!$res->is_success) { my $err = $res->error_as_HTML(); print <<"EOF"; Content-Type: text/html

Failure

Failed to retrive url: $url. Remote server returned the following reponse:
$err EOF goto end; } $type = $res->content_type; $buffer = $res->content; #neystadt::http_rtr::Http_Retrieve ($url, $buffer, $hdrs); #$hdrs=~/Content-Type: (.*)\n/io; $type = $1; } else { if ($file=~/cgi-bin/io) { $err = "Incorrect file name"; goto error; } $file = "$path$file"; if (-d $file) { $file = "$file/$IndexFileName"; $ext = 'htm'; } if (open In,"$file") { binmode In; read (In, $buffer, $maxsize); close In; } else { print "Content-type: text/html HTTP Error

Error: 404 Not Found


The requested URI $file does not exist.
"; goto end; } } if ($lang=~/auto/io){ $platform = HTTP::Headers::UserAgent::GetPlatform ($UserAgent); $lang='koi'; $lang='win' if $platform=~/WIN/io; $lang='mac' if $platform eq 'MAC'; $lang='koi' if $platform eq 'UNIX'; $lang='dos' if $platform eq 'OS2'; $lang='nocs' if $platform eq 'Linux'; } $newcharset = "koi8-r" if $lang=~/koi|nocs/io; $newcharset = "windows-1251" if $lang=~/win/io; $newcharset = "x-mac-cyrillic" if $lang=~/mac/io; $newcharset = "ibm866" if $lang=~/dos/io; $newcharset = "ISO-8859-5" if $lang=~/iso/io; if ($buffer=~s/<\s*META\s+HTTP-EQUIV\s*=\s*"?Content-Type"?\s+CONTENT\s*=\s*"?(.*);\s+charset\s*=\s*(.*)"?\s*>//io) { $type=$1; $charset=$2 if !$charset; if ($lang=~/nocs|vol/io){ $buffer=~s/<\s*META\s+HTTP-EQUIV\s*=\s*"?Content-Type"?\s+CONTENT\s*=\s*"?(.*);\s+charset\s*=\s*(.*)"?\s*>//io; } } else { $type="text/html" if $ext eq 'html' || $ext eq 'htm'; $type="text/plain" if $ext eq 'txt'; $type="image/gif" if $ext eq 'gif'; $type="image/jpeg" if $ext eq 'jpg' || $ext eq 'jpeg'; } $lang="koi8" if $lang=~/nocs/io; $type="text/html" if !$type; $slang=$defcode; $slang="KOI8" if $charset=~/koi/io; $slang="WIN" if $charset=~/1251/io; $slang="ISO" if $charset=~/iso/io; $slang="DOS" if $charset=~/alt/io; $slang="MAC" if $charset=~/mac/io; # translate the page $buffer = Convert::Cyrillic::cstocs ($slang,$lang,$buffer) if $type =~ /text/o; if ($hdrs) { binmode STDOUT; print $hdrs; } else { print("Content-type: $type\n\n"); binmode STDOUT; } print $buffer; goto end; error: ermsg($err); end:; sub ermsg { if (!$sw) {$sw=1; print "Content-type: text/plain\n\n";} print "@_[0]\n"; } __END__ =head1 DESCRIPTION Many Russia WWW servers are based on modified APACHE so, that different encodings are returned when clients connect to different server ports or to different subdomains. This is convenient for servers in Russia, but cannot be used abroad for Web sites using virtual servers or just having some space at an Internet provider's server. The following approach solves the problem by using one CGI script without any changes in WWW server software. Those are code.pl features: =over =item * Can translate localy stored files =item * Can translate remote files, retrieving them via HTTP =item * Recognizes source encoding from tag inside =item * Adjusts the above tag for new encoding or deletes it for buggy browsers. =item * Charsets supported: =over =item * B - KOI8-R =item * B - WINDOWS-1251 =item * B - Macintosh =item * B - DOS, alternative, CP-866 =item * B - ISO-8859-5 =item * B - Volapuk (transliteration) =item * B - KOI8-R, deleting Content-Type META tag, for buggy browsers =back =back =head1 SYNOPSIS =over =item 1 Put the script in your cgi-bin directory. =item 2 Edit the script to set script parameters to your configuration =over =item * $path=".."; # <==== path from cgi-bin to the server root. =item * $defcode="WIN"; # <==== default source encoding =item * $IndexFileName = 'index.html'; # default.htm or index.html, depending on your server =back =item 3 Refer to the script as: I/URL> to be translated. =over =item 1 B is one of the above encodings =item 2 B can also also be of form 'fromcode-tocode' for explicit definition of the original file encoding. =item 3 B is absolute URL from the server root (Don't forget to set B<$path> in code.pl) or full URL like http://cnn.com. =back =back All relative references from this page to other WEB pages will be also translated through the same code table (isn't supported yet for full URLs). Source encoding is determined by the following algorithm. The first matching rule from this list is selected. =over =item 1 If B specified by B form, B is the source encoding. =item 2 If Metatag like: is present its charset is used. The tag is updated during translation by replacing source encoding by the destination one. =item 3 Default encoding is taken from variable $defcode in code.pl. =back =head2 CAVEATS It is recommended that you put on all your pages, and choose only destination encoding in urls. Do not worry for old buggy browsers which can't display correctly pages with this metatag NOCS encoding converts page to koi8 and deletes the metatag. =head1 TIPS AND TRICKS If you use APPACHE you can add the lines similar to those to your webserver configuration files: ScriptAlias /koi8 /home/www/neystadt/cgi-bin/code.pl/koi8 ScriptAlias /win /home/www/neystadt/cgi-bin/code.pl/win ScriptAlias /dos /home/www/neystadt/cgi-bin/code.pl/dos ScriptAlias /mac /home/www/neystadt/cgi-bin/code.pl/mac ScriptAlias /iso /home/www/neystadt/cgi-bin/code.pl/iso ScriptAlias /vol /home/www/neystadt/cgi-bin/code.pl/vol ScriptAlias /lat /home/www/neystadt/cgi-bin/code.pl/vol ScriptAlias /nocs /home/www/neystadt/cgi-bin/code.pl/nocs From now you will be able to translate urls like http://www.neystadt.org/russia/ simply by prefixing the url with encoding: http://www.neystadt.org/koi8/russia/ or http://www.neystadt.org/lat/russia/. Note that code.pl automatically finds index.html if directory names is given (like in example above). The index file name can be changed by $IndexFileName parameter in the script. =head1 EXAMPLES To translate http://www.neystadt.org/vist/ from Windows-1251 to KOI8: http://www.neystadt.org/cgi-bin/code.pl/win-koi8/vist/ To translate output of the script http://www.neystadt.org/cgi-bin/miitqr.pl?abc from its default encoding to KOI8: http://www.neystadt.org/cgi-bin/code.pl/koi8/http://www.neystadt.org/cgi-bin/miitqr.pl?abc =head1 PREREQUISITES This script requires the C, C and C modules available from CPAN or at http://www.neystadt.org/cyrillic/. =pod OSNAMES All UNIXes, Windows NT =pod SCRIPT CATEGORIES CGI/Filter =cut


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