Web.pm

   1 # $Id$
   2 # Common functions for HTML/XHTML output generation
   3 # Copyright (C) 2003 Jan Kratochvil <project-www.jankratochvil.net@jankratochvil.net>
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; exactly version 2 of June 1991 is required
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program; if not, write to the Free Software
  16 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17
  18
  19 package My::Web;
  20 require 5.6.0;  # at least 'use warnings;' but we need some 5.6.0+ modules anyway
  21 our $VERSION=do { my @r=(q$Revision$=~/\d+/g); sprintf "%d.".("%03d"x$#r),@r; };
  22 our $CVS_ID=q$Id$;
  23 use strict;
  24 use warnings;
  25
  26 use Exporter;
  27 sub Wrequire ($);
  28 sub Wuse ($@);
  29 our $W;
  30 our @EXPORT=qw(&Wrequire &Wuse &a_href &a_href_cz &vskip &img &centerimg &rightimg $W &top_dir &top_dir_disk);
  31 our @ISA=qw(Exporter);
  32
  33 BEGIN
  34 {
  35         sub Wrequire ($)
  36         {
  37         my($file)=@_;
  38
  39 #               print STDERR "Wrequire $file\n";
  40                 $file=~s#/#::#g;
  41                 $file=~s/[.]pm$//;
  42                 my $class=$file;
  43                 $file=~s#::#/#g;
  44                 $file.=".pm";
  45                 my $aref=($W->{"packages_used"}{$Apache::Registry::curstash}||=[]);
  46                 push @$aref,$class
  47                                 if !{ map(($_=>1),@$aref) }->{$class};  # Prevent duplicated entries.
  48                 CORE::require $file;
  49                 1;      # Otherwise 'require' would already file above.
  50         }
  51
  52         sub Wuse ($@)
  53         {
  54         my($file,@list)=@_;
  55
  56 #               print STDERR "Wuse $file\n";
  57                 Wrequire $file;
  58                 local $Exporter::ExportLevel=$Exporter::ExportLevel+1;
  59                 $file->import(@list);
  60                 1;
  61         }
  62 }
  63
  64 BEGIN { Wuse 'WebConfig'; }     # for %WebConfig
  65 require CGI;    # for &escapeHTML
  66 require Image::Size;    # for &imgsize
  67 use File::Basename;     # &basename
  68 use Carp qw(cluck confess);
  69 use URI::Escape;
  70 require HTTP::BrowserDetect;
  71 require HTTP::Negotiate;
  72 require Geo::IP;
  73 require CGI;
  74
  75
  76 # Undo 'www/engine/httpd-restart' as it may use obsolete Perl for 'mod_perl'
  77 delete $ENV{"PERLLIB"};
  78 delete $ENV{"LD_LIBRARY_PATH"};
  79
  80
  81 #our $W;
  82                 # $W->{"title"}
  83                 # $W->{"head"}
  84                 # $W->{"head_css"}
  85                 # $W->{"force_charset"}
  86                 # %{$W->{"packages_used"}
  87                 # $W->{"heading_done"}
  88                 # $W->{"footer_passed"}
  89                 # %{$W->{"headers"}}
  90                 # %{$W->{"headers_lc"}} # maps lc($headers_key)=>$headers_key
  91                 # @{$W->{"packages_used"}{$Apache::Registry::curstash}}}
  92                 # %{$W->{"args"}}
  93
  94 sub init ($%)
  95 {
  96 my($class,%args)=@_;
  97
  98         print STDERR "$class->init ".$ENV{"REQUEST_URI"}."\n";
  99
 100         my $packages_used_save=$W->{"packages_used"};
 101         $W={ %WebConfig,%args };        # override %WebConfig settings
 102         $W->{"packages_used"}=$packages_used_save;
 103
 104         $W->{"__PACKAGE__"}||="Apache::ROOT".$Apache::Registry::curstash;
 105
 106         $W->{"top_dir"}||=eval '$'.$W->{"__PACKAGE__"}.'::top_dir';
 107
 108         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_ent");
 109         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_js");
 110         do { $W->{$_}=1  if !defined $W->{$_}; } for ("have_css");      # AFAIK it does not hurt anyone.
 111         do { $W->{$_}=1  if !defined $W->{$_}; } for ("heading");
 112         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer");
 113         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_delimit");
 114         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_mailme");
 115         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_ids");
 116         do { $W->{$_}=1  if !defined $W->{$_}; } for ("indexme");
 117         do { $W->{$_}="" if !defined $W->{$_}; } for ("head");
 118         do { $W->{$_}="" if !defined $W->{$_}; } for ("head_css");
 119
 120         my $footer_any=0;
 121         for (qw(footer_mailme footer_ids)) {
 122                 $W->{$_}=0 if !$W->{"footer"};
 123                 $footer_any=1 if $W->{$_};
 124                 }
 125         $W->{"footer"}=0 if !$footer_any;
 126         $W->{"footer_delimit"}=0 if !$W->{"footer"};
 127
 128         $W->{"r"}=Apache->request();
 129
 130         $W->{"QUERY_STRING"}=$W->{"r"}->args() || "";
 131            if ($W->{"QUERY_STRING"}=~/[&]amp;have_ent/)
 132                 { $W->{"have_ent"}=0; }
 133         elsif ($W->{"QUERY_STRING"}=~    /[&]have_ent/)
 134                 { $W->{"have_ent"}=1; }
 135         else
 136                 { delete $W->{"have_ent"}; }
 137         if ($W->{"detect_ent"} && !defined $W->{"have_ent"} && $W->{"r"}->method() eq "GET") {
 138                 $W->{"head"}.='<meta http-equiv="Refresh" content="0; URL='
 139                                 .CGI::escapeHTML("http://".&{$W->{"web_hostname_sub"}}()."/".($W->{"r"}->uri()=~m#^/*(.*)$#)[0]
 140                                                 ."?".($W->{"QUERY_STRING"} || "detect_ent_glue=1").'&have_ent=detect')
 141                                 .'" />'."\n";
 142                 }
 143         $W->{"QUERY_STRING"}=~s/([&])amp;/$1/g;
 144         $W->{"r"}->args($W->{"QUERY_STRING"});
 145         $ENV{"QUERY_STRING"}=$W->{"QUERY_STRING"};
 146         # Do not: $W->{"r"}->args()
 147         # as it parses only QUERY_STRING (not POST data).
 148         $W->{"args"}={ CGI->new()->Vars() };
 149         for (keys(%{$W->{"args"}})) {
 150                 my @vals=split /\x00/,$W->{"args"}{$_};
 151                 next if @vals<=1;
 152                 $W->{"args"}{$_}=[@vals];
 153                 }
 154
 155         do { $W->{$_}=$ENV{"HTTP_ACCEPT"} if !defined $W->{$_}; } for ("accept");
 156         do { $W->{$_}=$ENV{"HTTP_USER_AGENT"} if !defined $W->{$_}; } for ("user_agent");
 157
 158         $W->{"browser"}=HTTP::BrowserDetect->new($W->{"user_agent"});
 159
 160         if (!defined $W->{"have_style"}) {
 161                 $W->{"have_style"}=(!$W->{"browser"}->netscape() || ($W->{"browser"}->major() && $W->{"browser"}->major()>4) ? 1 : 0);
 162                 }
 163
 164         $W->{"have_js"}=($W->{"args"}{"have_js"} ? 1 : 0);
 165         if ($W->{"detect_js"} && !$W->{"have_js"}) {
 166                 $W->{"head"}.='<script type="text/javascript" src="'.top_dir('/have_js.js.pl').'"></script>'."\n";
 167                 }
 168
 169         do { args_check(%$_) if $_; } for ($W->{"args_check"});
 170
 171         return $W;
 172 }
 173
 174 sub top_dir_disk ()
 175 {
 176         do { return $_ if $_; } for ($W->{"top_dir"});
 177         return $INC[0]; # fallback
 178 }
 179
 180 sub top_dir (;$)
 181 {
 182 my($in)=@_;
 183
 184         if (my $uri=$ENV{"REQUEST_URI"}) {
 185                 if ($W->{"args"}{"Wabs"}) {
 186                         if ($in=~m#^/#) {
 187                                 $in=~s#^/*##;
 188                                 }
 189                         else {
 190                                 $in=$ENV{"REQUEST_URI"}."/".$in;
 191                                 $in=~tr#/#/#s;
 192                                 1 while $in=~s#/(?:[^/]+)/\Q..\E/#/#g
 193                                 }
 194                         return "http://".&{$W->{"web_hostname_sub"}}()."/".(defined $in ? $in : "");
 195                         }
 196                 $uri.="Index" if $uri=~m#/$#;
 197                 if (defined $in) {
 198                         my($inpath,$inquery)=split /[?]/,$in,2;
 199                         $inpath=~tr///cs;
 200                         $uri=~tr///cs;
 201                         for (;;) {
 202                                 my($in1 ,$in2 )=($in =~m#^(/[^/]+)(/.*)$#);
 203                                 my($uri1,$uri2)=($uri=~m#^(/[^/]+)(/.*)$#);
 204                                 last if !defined $in1 || !defined $uri1 || $in1 ne $uri1;
 205                                 $in=$in2;
 206                                 $uri=$uri2;
 207                                 }
 208                         }
 209                 $uri=~s#^/*##;
 210                 $uri=~s#[^/]+#..#g;
 211                 $uri=File::Basename::dirname($uri);
 212                 my $r=$uri.(defined $in ? $in : "");
 213 #               1 while $r=~s#^[.]/##;
 214 #               $r="./$r" if $r=~m#^(?:?.*)$#;  # empty pathname?
 215                 return $r;
 216                 }
 217         return top_dir_disk().$in;
 218 }
 219
 220 sub fatal (;$);
 221
 222 sub args_check (%)
 223 {
 224 my(%tmpl)=@_;
 225
 226         while (my($name,$regex)=each(%tmpl)) {
 227                 my $name_html="Parameter <span class=\"quote\">".CGI::escapeHTML($name)."</span>";
 228                 $W->{"args"}{$name}="" if !defined $W->{"args"}{$name};
 229                 $W->{"args"}{$name}=[ $W->{"args"}{$name} ] if !ref $W->{"args"}{$name} && ref $regex;
 230                 fatal "$name_html passed as multivar although singlevar expected"
 231                                 if ref $W->{"args"}{$name} && !ref $regex;
 232                 $regex=${$regex}[0] if ref $regex;
 233                 for my $val (!ref $W->{"args"}{$name} ? $W->{"args"}{$name} : @{$W->{"args"}{$name}}) {
 234                         $val="" if !defined $val;
 235                         fatal "$name_html <span class=\"quote\">".CGI::escapeHTML($val)."</span>"
 236                                                         ." does not match the required regex <span class=\"quote\">".CGI::escapeHTML($regex)."</span> "
 237                                         if $regex ne "" && $val!~/$regex/;
 238                         }
 239                 }
 240 }
 241
 242 sub vskip (;$)
 243 {
 244 my($height)=@_;
 245
 246         return '<p'.(!defined $height ? "" : ' style="height: '.$height.';"').'>&nbsp;</p>'."\n";
 247 }
 248
 249 sub fatal (;$)
 250 {
 251 my($msg)=@_;
 252
 253         $msg="UNKNOWN" if !$msg;
 254
 255         $W->{"indexme"}=0;      # For the case no heading was sent yet.
 256         My::Web->heading();
 257         print "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
 258                         ."<p>You can report this problem's details to"
 259                         ." ".a_href("mailto:".$W->{"admin_mail"},"admin of this website").".</p>\n";
 260         footer();
 261 }
 262
 263 sub footer (;$)
 264 {
 265         exit 1 if $W->{"footer_passed"}++;      # deadlock prevention:
 266
 267         print vskip if $W->{"footer_delimit"};
 268
 269         if ($W->{"heading"}) {
 270                 do { &{$_}() if $_; } for ($W->{"footing_delimit"});
 271                 }
 272
 273         print "<hr />\n" if $W->{"footer"};
 274
 275         if ($W->{"footer_mailme"}) {
 276                 print '<form action="'.top_dir('/SendMsg.pl').'" method="post" onsubmit="'
 277                                 ."this.elements['msgscript'].value=this.elements['msghtml'].value;"
 278                                 ."this.elements['msghtml'].value='';"
 279                                 ."this.submit();"
 280                                 .'">'."\n";
 281                         print '<p align="right">'."\n";
 282                                 print '<input name="msgscript" type="hidden" />'."\n";
 283                                 print '<input name="msghtml" type="text" size="32" alt="Message" />'."\n";
 284                                 print '<input name="submit" type="submit" value="Quick Note" />'."\n";
 285                         print '</p>'."\n";
 286                 print '</form>'."\n";
 287                 }
 288
 289         if ($W->{"footer_ids"}) {
 290                 print '<p class="cvs-id">';
 291                 print join("<br />\n",map({ my $package=$_;
 292                         my $cvs_id=(eval('$'.$package."::CVS_ID")
 293 #                                       || $package     # debug
 294                                         );
 295                         if (!$cvs_id) {
 296                                 ();
 297                                 }
 298                         else {
 299                                 $cvs_id='$'.$cvs_id.'$';        # Eaten by 'q' operator.
 300                                 my @cvs_id_split=split / +/,$cvs_id;
 301                                 if (@cvs_id_split==8) {
 302                                         my $file=$package;
 303                                         $file=~s#::#/#g;
 304                                         my $ext;
 305                                         for (qw(.html.pl .pl .pm),"") {
 306                                                 $ext=$_;
 307                                                 last if -r top_dir_disk()."/$file$ext";
 308                                                 cluck "Class file $file not found" if !$ext;
 309                                                 }
 310                                         $file.=$ext;
 311                                         $cvs_id_split[2]=""
 312                                                         .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $W->{"viewcvs"}))[0]."$file?rev=".$cvs_id_split[2],
 313                                                                         $cvs_id_split[2]);
 314                                         $cvs_id_split[1]=a_href($W->{"viewcvs"}.$file,
 315                                                         ($package!~/^Apache::/ ? $package : $cvs_id_split[1]));
 316                                         $cvs_id_split[5]=&{$W->{"cvs_id_author"}}($cvs_id_split[5]);
 317                                         }
 318                                 join " ",@cvs_id_split;
 319                                 }
 320                         } (
 321                                         $W->{"__PACKAGE__"},
 322                                         __PACKAGE__,
 323                                         @{$W->{"packages_used"}{$Apache::Registry::curstash}},
 324                                         )));
 325                 print "</p>\n";
 326                 }
 327
 328         for my $package (
 329                         $W->{"__PACKAGE__"},
 330                         __PACKAGE__,
 331                         @{$W->{"packages_used"}{$Apache::Registry::curstash}},
 332                         ) {
 333                 my $cvs_id=(eval('$'.$package."::CVS_ID")
 334 #                               || $package     # debug
 335                                 );
 336                 print '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
 337                 }
 338
 339         if ($W->{"heading"}) {
 340                 do { &{$_}() if $_; } for ($W->{"footing"});
 341                 }
 342
 343         print "</body></html>\n";
 344         exit(0);
 345 }
 346
 347 sub header (%)
 348 {
 349 my(%pairs)=@_;
 350
 351         while (my($key,$val)=each(%pairs)) {
 352                 do { cluck "Headers already sent"; next; } if $W->{"heading_done"};
 353                 for ($W->{"headers_lc"}{lc $key} || ()) {
 354                         delete $W->{"headers"}{$_};
 355                         }
 356                 $W->{"headers_lc"}{lc $key}=$key;
 357                 $W->{"headers"}{$key}=$val;
 358                 }
 359 }
 360
 361 sub size_display ($)
 362 {
 363 my($size)=@_;
 364
 365            if ($size<4096)
 366                 {}
 367         elsif ($size<1024*1024)
 368                 { $size=sprintf "%.1fK",$size/1024; }
 369         else
 370                 { $size=sprintf "%.1fM",$size/1024/1024; }
 371         $size.="B";
 372         return $size;
 373 }
 374
 375 sub url_is_local ($)
 376 {
 377 my($url)=@_;
 378
 379         return $url!~m#^[a-z]+://#;
 380 }
 381
 382 sub a_href ($;$%)
 383 {
 384 my($url,$contents,%args)=@_;
 385
 386         do { $$_=1 if !defined $$_; } for (\$args{"size"});
 387         $contents=CGI::escapeHTML($url) if !defined $contents;
 388         $contents=~s#<a\b[^>]*>##gi;
 389         $contents=~s#</a>##gi;
 390
 391         $url=top_dir($url) if url_is_local $url && $url=~m#^/#;
 392
 393         my $r='<a href="';
 394         my $urlent=CGI::escapeHTML($url);
 395            if ($url eq $urlent)
 396                 { $r.=$url; }
 397         elsif (url_is_local $url)
 398                 { $r.=$urlent; }
 399         elsif (defined $W->{"have_ent"} && !$W->{"have_ent"})   # non-ent client
 400                 { $r.=$url; }
 401         elsif ($W->{"have_ent"})        # ent client
 402                 { $r.=$urlent; }
 403         else    # unknown client, &CGI::escapeHTML should not be needed here
 404                 { $r.=CGI::escapeHTML(top_dir('/Redirect.pl?location='.uri_escape($url))); }
 405         $r.='"';
 406         do { $r.=" $_" if $_; } for ($args{"attr"});
 407         $r.='>'.$contents.'</a>';
 408         if ($args{"size"} && url_is_local($url) && $url=~/[.](?:gz|Z|rpm|zip|deb|lha)/) {       # Downloadable?
 409                 $url=top_dir_disk().$url if $url=~m#^/#;
 410                 if (!-r $url)
 411                         { cluck "File not readable: $url"; }
 412                 else {
 413                         $r.='&nbsp;('.size_display((stat($url))[7]).')';
 414                         }
 415                 }
 416         return $r;
 417 }
 418
 419 sub remote_ip ()
 420 {
 421         # Do not: PerlModule                 Apache::ForwardedFor
 422         #         PerlPostReadRequestHandler Apache::ForwardedFor
 423         # As 'Apache::ForwardedFor' takes the first of $ENV{"HTTP_X_FORWARDED_FOR"}
 424         # while the contents is '127.0.0.1, 213.220.195.171' if client has its own proxy.
 425         # We must take the last item ourselves.
 426         my $r=$ENV{"HTTP_X_FORWARDED_FOR"} || $W->{"r"}->get_remote_host();
 427         $r=~s/^.*,\s*//;
 428         return $r;
 429 }
 430
 431 sub is_cz ()
 432 {
 433         return "CZ" eq Geo::IP->new()->country_code_by_addr(remote_ip());
 434 }
 435
 436 sub a_href_cz ($$;%)
 437 {
 438 my($url,$contents,%args)=@_;
 439
 440         return a_href $url,$contents,%args if is_cz();
 441         return $contents;
 442 }
 443
 444 sub make ($)
 445 {
 446 my($cmd)=@_;
 447
 448         system {'flock'} 'flock','-x',top_dir_disk(),$cmd.' >&2';
 449 }
 450
 451 sub img_size ($$)
 452 {
 453 my($width,$height)=@_;
 454
 455         return ($W->{"have_style"} ? "style=\"border:0;width:${width}px;height:${height}px\"" : "border=\"0\"")
 456                         ." width=\"$width\" height=\"$height\"";
 457 }
 458
 459 sub negotiate_variant (%)
 460 {
 461 my(%args)=@_;
 462
 463         my @fields=("id","qs","content-type","encoding","charset","lang","size");
 464         return [ map(($args{$_}),@fields) ];
 465 }
 466
 467 my @img_variants=(
 468                 { "id"=>"png","qs"=>1.0,"content-type"=>"image/png" },
 469                 { "id"=>"gif","qs"=>0.9,"content-type"=>"image/gif" },
 470                 );
 471 my $img_variants_re='[.](?:'.join('|',"jpeg",map(($_->{"id"}),@img_variants)).')$';
 472
 473 sub img_src ($)
 474 {
 475 my($file_base)=@_;
 476
 477         if (!url_is_local($file_base)) {
 478                 return $file_base if !wantarray();
 479                 return ($file_base,$file_base);
 480                 }
 481         # Known image extension?
 482         if ($file_base=~m#$img_variants_re#o) {
 483                 return $file_base if !wantarray();
 484                 return ($file_base,$file_base) if $file_base!~m#^/#;
 485                 return (top_dir($file_base),top_dir_disk().$file_base);
 486                 }
 487
 488         my $file_base_disk;
 489         my $file_base_uri;
 490         if ($file_base!~m#^/#) {
 491                 $file_base_disk=$file_base_uri=$file_base;
 492                 }
 493         else {
 494                 $file_base_disk=top_dir_disk().$file_base;
 495                 $file_base_uri=top_dir($file_base);
 496                 }
 497
 498         my @nego_variants;
 499         for my $var (@img_variants) {
 500                 my $file=$file_base_disk.".".$var->{"id"};
 501                 # TODO: Somehow quickly check dependencies?
 502                 make('make -s --no-print-directory'
 503                                                 .' -C '."'".File::Basename::dirname($file)."' '".File::Basename::basename($file)."'")
 504                                 if !-f $file;
 505                 push @nego_variants,negotiate_variant(
 506                                 %$var,
 507                                 "size"=>(stat $file)[7],
 508                                 );
 509                 }
 510         # Do not: ,$W->{"r"});
 511         # but should we provide somehow either 'HTTP::Headers' or 'HTTP::Request' ?
 512         my $ext=HTTP::Negotiate::choose(\@nego_variants);
 513         $ext||=$img_variants[0]->{"id"};        # &HTTP::Negotiate::choose failed?
 514
 515         return $file_base_uri.".".$ext if !wantarray();
 516         return ($file_base_uri.".".$ext,$file_base_disk.".".$ext);
 517 }
 518
 519 sub img ($$;%)
 520 {
 521 my($file_base,$alt,%attr)=@_;
 522
 523         my($file_uri,$file_disk)=img_src $file_base;
 524         my($width,$height)=Image::Size::imgsize($file_disk);
 525         $alt=~s/<[^>]*>//g;
 526         $alt=CGI::escapeHTML($alt);
 527         my $content="<img src=\"$file_uri\" alt=\"$alt\" title=\"$alt\" ".img_size($width,$height)
 528                         .(!$attr{"attr"} ? "" : " ".$attr{"attr"})." />";
 529         return a_href img_src($attr{"a_href_img"}),$content if $attr{"a_href_img"};
 530         return a_href $attr{"a_href"},$content if $attr{"a_href"};
 531         return $content;
 532 }
 533
 534 sub centerimg
 535 {
 536         my $r.="";
 537         $r.='<table border="0" width="100%"><tr>'."\n";
 538         @_=( [@_] ) if !ref $_[0];
 539         for (@_) {
 540                 $r.="\t".'<td align="center">'.&{\&img}(@$_).'</td>'."\n";
 541                 }
 542         $r.='</tr></table>'."\n";
 543         return $r;
 544 }
 545
 546 sub rightimg
 547 {
 548 my($text,@args_img)=@_;
 549
 550         # Workaround bug of 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)':
 551         return <<"HERE";
 552 <table border="0" width="100%">
 553         <col width="@{[ (!$W->{"browser"}->ie() ? "1*" : "90%" ) ]}" />
 554         <col width="@{[ (!$W->{"browser"}->ie() ? "0*" : "10%" ) ]}" />
 555         <tr>
 556                 <td align="left">
 557                         @{[ $text ]}
 558                 </td>
 559                 <td align="right">
 560                         @{[ &{\&img}(@args_img) ]}
 561                 </td>
 562         </tr>
 563 </table>
 564 HERE
 565 }
 566
 567 sub readfile ($$)
 568 {
 569 my($class,$filename)=@_;
 570
 571         local *F;
 572         open F,$filename or die "Cannot open \"$filename\": $!";
 573         local $/=undef();
 574         my $data=<F>;
 575         close F;
 576         return $data;
 577 }
 578
 579 sub arr_keys (@)
 580 {
 581 my(@arr)=@_;
 582
 583         my @r=();
 584         while (@arr) {
 585                 push @r,shift @arr;     # key
 586                 shift @arr;     # val
 587                 }
 588         return @r;
 589 }
 590
 591 sub heading ()
 592 {
 593 my($class)=@_;
 594
 595         return if $W->{"heading_passed"}++;
 596
 597         # $ENV{"CLIENT_CHARSET"} ignored (mod_czech support dropped!)
 598         my $client_charset=$W->{"force_charset"} || "us-ascii";
 599         header("Content-Style-Type"=>"text/css");
 600         header("Content-Script-Type"=>"text/javascript");
 601
 602         while (my($key,$val)=each(%{$W->{"headers"}})) {
 603                 $W->{"r"}->header_out($key,$val);
 604                 }
 605         $W->{"r"}->send_http_header("text/html; charset=$client_charset");      # "Content-type"; do not use header()
 606
 607         return if $W->{"heading_done"}++;
 608         exit if $W->{"r"}->header_only();
 609
 610         if (1) { # || !$msie_major || $msie_major>=4) # TODO:dyn
 611                 print '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n";
 612                 }
 613         print '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
 614         print '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">'."\n";
 615         my $title=$W->{"title_prefix"}.join("",map({ ': '.$_; } ($W->{"title"} || ())));
 616         $title=~s#<[^>]*>##g;
 617         print "<head>";
 618         print "<title>$title</title>\n";
 619
 620         if ($W->{"have_css"}) {
 621                 print <<'HERE';
 622 <style type="text/css"><!--
 623 .cvs-id   { font-family: monospace; }
 624 .error    { color: red;   background-color: transparent; }
 625 .quote    { font-family: monospace; }
 626 .nowrap   { white-space: nowrap; }
 627 .centered { text-align: center; }
 628 .tab-bold { font-weight: bold; }
 629 .tab-head { font-weight: bold; color: yellow; background-color: transparent; }
 630 body {
 631                 background-color: black;
 632                 color: white;
 633                 }
 634 :link    { color: aqua;   background-color: transparent; }
 635 :visited { color: teal;   background-color: transparent; }
 636 h1,h2    { color: yellow; background-color: transparent; }
 637 td       { padding: 2px; }
 638 caption  { caption-side: bottom; }
 639 .footer img { vertical-align: middle; }
 640 HERE
 641                 print $W->{"head_css"}."\n";
 642                 print "--></style>\n";
 643                 }
 644
 645         print '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
 646         print $W->{"head"};
 647         for my $type (qw(prev next index contents start up)) {
 648                 do { print '<link rel="'.$type.'" href="'.$_.'" />'."\n" if $_; } for ($W->{"rel_$type"});
 649                 }
 650         print "</head><body";
 651         print ' bgcolor="black" text="white" link="aqua" vlink="teal"'
 652                         if $W->{"browser"}->netscape() && (!$W->{"browser"}->major() || $W->{"browser"}->major()<=4);
 653         print ">\n";
 654
 655         if ($W->{"heading"}) {
 656                 do { &{$_}() if $_; } for ($W->{"heading"});
 657                 }
 658 }
 659
 660 1;