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 &Wprint);
  31 our @ISA=qw(Exporter Tie::Handle);
  32
  33 BEGIN
  34 {
  35         $W->{"__My::Web_init"}=1;
  36
  37         sub Wrequire ($)
  38         {
  39         my($file)=@_;
  40
  41 #               print STDERR "Wrequire $file\n";
  42                 $file=~s#/#::#g;
  43                 $file=~s/[.]pm$//;
  44                 my $class=$file;
  45                 $file=~s#::#/#g;
  46                 $file.=".pm";
  47                 my $who=$W->{"__PACKAGE__"};
  48                 $who||="__My::Web" if $W->{"__My::Web_init"};
  49                 my $aref=($W->{"packages_used"}{$who}||=[]);
  50                 push @$aref,$class
  51                                 if !{ map(($_=>1),@$aref) }->{$class};  # Prevent duplicated entries.
  52                 CORE::require $file;
  53                 1;      # Otherwise 'require' would already file above.
  54         }
  55
  56         sub Wuse ($@)
  57         {
  58         my($file,@list)=@_;
  59
  60 #               print STDERR "Wuse $file\n";
  61                 Wrequire $file;
  62                 local $Exporter::ExportLevel=$Exporter::ExportLevel+1;
  63                 $file->import(@list);
  64                 1;
  65         }
  66 }
  67
  68 BEGIN { Wuse 'WebConfig'; }     # for %WebConfig
  69 require CGI;    # for &escapeHTML
  70 require Image::Size;    # for &imgsize
  71 use File::Basename;     # &basename
  72 use Carp qw(cluck confess);
  73 use URI::Escape;
  74 require HTTP::BrowserDetect;
  75 require HTTP::Negotiate;
  76 my $have_Geo_IP; BEGIN { $have_Geo_IP=eval { require Geo::IP; 1; }; }
  77 use ModPerl::Util qw(exit);
  78 use POSIX qw(strftime);
  79 use Tie::Handle;
  80
  81
  82 #our $W;
  83                 # $W->{"title"}
  84                 # $W->{"head"}
  85                 # $W->{"head_css"}
  86                 # $W->{"force_charset"}
  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"}{$W->{"__PACKAGE__"}}}
  92                 # @{$W->{"packages_used"}{"__My::Web"}}
  93                 # %{$W->{"args"}}
  94
  95 sub init ($%)
  96 {
  97 my($class,%args)=@_;
  98
  99         print STDERR "$class->init ".Apache->request()->unparsed_uri()."\n";
 100
 101         my $packages_used_save=$W->{"packages_used"};
 102         $W={ %WebConfig,%args };        # override %WebConfig settings
 103         $W->{"packages_used"}=$packages_used_save;
 104
 105         # {"__PACKAGE__"} is mandatory for mod_perl-2.0;
 106         # $Apache::Registry::curstash is no longer supported.
 107         do { cluck "No $_" if !$W->{$_}; } for "__PACKAGE__";
 108
 109         $W->{"top_dir"}||=eval '$'.$W->{"__PACKAGE__"}.'::top_dir';
 110
 111         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_ent");
 112         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_js");
 113         do { $W->{$_}=1  if !defined $W->{$_}; } for ("have_css");      # AFAIK it does not hurt anyone.
 114         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer");
 115         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_delimit");
 116         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_mailme");
 117         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_ids");
 118         do { $W->{$_}=1  if !defined $W->{$_}; } for ("indexme");
 119         do { $W->{$_}="" if !defined $W->{$_}; } for ("head");
 120         do { $W->{$_}="" if !defined $W->{$_}; } for ("head_css");
 121
 122         my $footer_any=0;
 123         for (qw(footer_mailme footer_ids)) {
 124                 $W->{$_}=0 if !$W->{"footer"};
 125                 $footer_any=1 if $W->{$_};
 126                 }
 127         $W->{"footer"}=0 if !$footer_any;
 128         $W->{"footer_delimit"}=0 if !$W->{"footer"};
 129
 130         $W->{"r"}=Apache->request();
 131
 132         $W->{"QUERY_STRING"}=$W->{"r"}->args() || "";
 133            if ($W->{"QUERY_STRING"}=~/[&]amp;have_ent/)
 134                 { $W->{"have_ent"}=0; }
 135         elsif ($W->{"QUERY_STRING"}=~    /[&]have_ent/)
 136                 { $W->{"have_ent"}=1; }
 137         else
 138                 { delete $W->{"have_ent"}; }
 139         if ($W->{"detect_ent"} && !defined $W->{"have_ent"} && $W->{"r"}->method() eq "GET") {
 140                 $W->{"head"}.='<meta http-equiv="Refresh" content="0; URL='
 141                                 .CGI::escapeHTML("http://".&{$W->{"web_hostname_sub"}}()."/".($W->{"r"}->uri()=~m#^/*(.*)$#)[0]
 142                                                 ."?".($W->{"QUERY_STRING"} || "detect_ent_glue=1").'&have_ent=detect')
 143                                 .'" />'."\n";
 144                 }
 145         $W->{"QUERY_STRING"}=~s/([&])amp;/$1/g;
 146         $W->{"r"}->args($W->{"QUERY_STRING"});
 147         # Do not: $W->{"r"}->args()
 148         # as it parses only QUERY_STRING (not POST data).
 149         $W->{"args"}={ CGI->new($W->{"r"})->Vars() };
 150         for (keys(%{$W->{"args"}})) {
 151                 my @vals=split /\x00/,$W->{"args"}{$_};
 152                 next if @vals<=1;
 153                 $W->{"args"}{$_}=[@vals];
 154                 }
 155
 156         do { $W->{$_}=$W->{"r"}->headers_in()->{"Accept"}     if !defined $W->{$_}; } for ("accept");
 157         do { $W->{$_}=$W->{"r"}->headers_in()->{"User-Agent"} if !defined $W->{$_}; } for ("user_agent");
 158
 159         $W->{"browser"}=HTTP::BrowserDetect->new($W->{"user_agent"});
 160
 161         if (!defined $W->{"have_style"}) {
 162                 $W->{"have_style"}=(!$W->{"browser"}->netscape() || ($W->{"browser"}->major() && $W->{"browser"}->major()>4) ? 1 : 0);
 163                 }
 164
 165         $W->{"have_js"}=($W->{"args"}{"have_js"} ? 1 : 0);
 166         if ($W->{"detect_js"} && !$W->{"have_js"}) {
 167                 $W->{"head"}.='<script type="text/javascript" src="'.top_dir('/have_js.js.pl').'"></script>'."\n";
 168                 }
 169
 170         do { args_check(%$_) if $_; } for ($W->{"args_check"});
 171
 172         $ENV{"HOSTNAME"}||=&{$W->{"web_hostname_sub"}}();
 173
 174         return bless $W,$class;
 175 }
 176
 177 sub Wprint($)
 178 {
 179 my($text)=@_;
 180
 181         $W->{"r"}->puts($text);
 182 }
 183
 184 # local *FH;
 185 # tie *FH,ref($W),$W;
 186 sub TIEHANDLE($)
 187 {
 188 my($class,$W)=@_;
 189
 190         my $self={};
 191         $self->{"W"}=$W or confess "Missing W";
 192         return bless $self,$class;
 193 }
 194
 195 sub WRITE
 196 {
 197 my($self,$scalar,$length,$offset)=@_;
 198
 199         Wprint substr($scalar,0,$length);
 200 }
 201
 202 sub top_dir_disk ()
 203 {
 204         do { return $_ if $_; } for ($W->{"top_dir"});
 205         return $INC[0]; # fallback
 206 }
 207
 208 sub top_dir (;$)
 209 {
 210 my($in)=@_;
 211
 212         if (my $uri=$W->{"r"}->unparsed_uri()) {
 213                 if ($W->{"args"}{"Wabs"}) {
 214                         # FIXME: $in may not be defined here!
 215                         # to prevent: Use of uninitialized value in ...
 216                         if ($in=~m#^/#) {
 217                                 $in=~s#^/*##;
 218                                 }
 219                         else {
 220                                 $in=$uri."/".$in;
 221                                 $in=~tr#/#/#s;
 222                                 1 while $in=~s#/(?:[^/]+)/\Q..\E/#/#g
 223                                 }
 224                         return "http://".&{$W->{"web_hostname_sub"}}()."/".(defined $in ? $in : "");
 225                         }
 226                 $uri.="Index" if $uri=~m#/$#;
 227                 if (defined $in) {
 228                         my($inpath,$inquery)=split /[?]/,$in,2;
 229                         $inpath=~tr///cs;
 230                         $uri=~tr///cs;
 231                         for (;;) {
 232                                 my($in1 ,$in2 )=($in =~m#^(/[^/]+)(/.*)$#);
 233                                 my($uri1,$uri2)=($uri=~m#^(/[^/]+)(/.*)$#);
 234                                 last if !defined $in1 || !defined $uri1 || $in1 ne $uri1;
 235                                 $in=$in2;
 236                                 $uri=$uri2;
 237                                 }
 238                         }
 239                 $uri=~s#^/*##;
 240                 $uri=~s#[^/]+#..#g;
 241                 $uri=File::Basename::dirname($uri);
 242                 my $r=$uri.(defined $in ? $in : "");
 243 #               1 while $r=~s#^[.]/##;
 244 #               $r="./$r" if $r=~m#^(?:?.*)$#;  # empty pathname?
 245                 return $r;
 246                 }
 247         return top_dir_disk().$in;
 248 }
 249
 250 sub fatal (;$);
 251
 252 sub args_check (%)
 253 {
 254 my(%tmpl)=@_;
 255
 256         while (my($name,$regex)=each(%tmpl)) {
 257                 my $name_html="Parameter <span class=\"quote\">".CGI::escapeHTML($name)."</span>";
 258                 $W->{"args"}{$name}="" if !defined $W->{"args"}{$name};
 259                 $W->{"args"}{$name}=[ $W->{"args"}{$name} ] if !ref $W->{"args"}{$name} && ref $regex;
 260                 fatal "$name_html passed as multivar although singlevar expected"
 261                                 if ref $W->{"args"}{$name} && !ref $regex;
 262                 $regex=$regex->[0] if ref $regex;
 263                 for my $val (!ref $W->{"args"}{$name} ? $W->{"args"}{$name} : @{$W->{"args"}{$name}}) {
 264                         $val="" if !defined $val;
 265                         fatal "$name_html <span class=\"quote\">".CGI::escapeHTML($val)."</span>"
 266                                                         ." does not match the required regex <span class=\"quote\">".CGI::escapeHTML($regex)."</span> "
 267                                         if $regex ne "" && $val!~/$regex/;
 268                         }
 269                 }
 270 }
 271
 272 sub vskip (;$)
 273 {
 274 my($height)=@_;
 275
 276         return '<p'.(!defined $height ? "" : ' style="height: '.$height.';"').'>&nbsp;</p>'."\n";
 277 }
 278
 279 sub fatal (;$)
 280 {
 281 my($msg)=@_;
 282
 283         $msg="UNKNOWN" if !$msg;
 284
 285         $W->{"indexme"}=0;      # For the case no heading was sent yet.
 286         My::Web->heading();
 287         Wprint "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
 288                         ."<p>You can report this problem's details to"
 289                         ." ".a_href("mailto:".$W->{"admin_mail"},"admin of this website").".</p>\n";
 290         footer();
 291 }
 292
 293 sub footer (;$)
 294 {
 295         exit 1 if $W->{"footer_passed"}++;      # deadlock prevention:
 296
 297         Wprint vskip if $W->{"footer_delimit"};
 298
 299         do { &{$_}() if $_; } for ($W->{"footing_delimit"});
 300
 301         Wprint "<hr />\n" if $W->{"footer"};
 302
 303         if ($W->{"footer_mailme"}) {
 304                 Wprint '<form action="'.top_dir('/SendMsg.pl').'" method="post" onsubmit="'
 305                                 ."this.elements['msgscript'].value=this.elements['msghtml'].value;"
 306                                 ."this.elements['msghtml'].value='';"
 307                                 ."this.submit();"
 308                                 .'">'."\n";
 309                         Wprint '<p align="right">'."\n";
 310                                 Wprint '<input name="msgscript" type="hidden" />'."\n";
 311                                 Wprint '<input name="msghtml" type="text" size="32" alt="Message" />'."\n";
 312                                 Wprint '<input name="submit" type="submit" value="Quick Note" />'."\n";
 313                         Wprint '</p>'."\n";
 314                 Wprint '</form>'."\n";
 315                 }
 316
 317         my @packages_used=(
 318                         $W->{"__PACKAGE__"},
 319                         __PACKAGE__,
 320                         @{$W->{"packages_used"}{"__My::Web"}},
 321                         map((!$_ ? () : @$_),$W->{"packages_used"}{$W->{"__PACKAGE__"}}),
 322                         );
 323         my %packages_used;
 324         @packages_used=grep((!$packages_used{$_}++),@packages_used);
 325         if ($W->{"footer_ids"}) {
 326                 Wprint '<p class="cvs-id">';
 327                 Wprint join("<br />\n",map({ my $package=$_;
 328                         my $cvs_id=(eval('$'.$package."::CVS_ID")
 329 #                                       || $package     # debug
 330                                         );
 331                         if (!$cvs_id) {
 332                                 ();
 333                                 }
 334                         else {
 335                                 $cvs_id='$'.$cvs_id.'$';        # Eaten by 'q' operator.
 336                                 my @cvs_id_split=split / +/,$cvs_id;
 337                                 if (@cvs_id_split==8) {
 338                                         my $file=$package;
 339                                         $file=~s#::#/#g;
 340                                         my $ext;
 341                                         my @tried;
 342                                         for (qw(.html.pl .pl .pm),"") {
 343                                                 $ext=$_;
 344                                                 my $pathname=top_dir_disk()."/$file$ext";
 345                                                 push @tried,$pathname;
 346                                                 last if -r $pathname;
 347                                                 cluck "Class file $file not found; tried: ".join(" ",@tried) if !$ext;
 348                                                 }
 349                                         $file.=$ext;
 350                                         $cvs_id_split[2]=""
 351                                                         .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $W->{"viewcvs"}))[0]."$file?rev=".$cvs_id_split[2],
 352                                                                         $cvs_id_split[2]);
 353                                         $cvs_id_split[1]=a_href($W->{"viewcvs"}.$file,
 354                                                         ($package!~/^Apache::/ ? $package : $cvs_id_split[1]));
 355                                         $cvs_id_split[5]=&{$W->{"cvs_id_author"}}($cvs_id_split[5]);
 356                                         }
 357                                 join " ",@cvs_id_split;
 358                                 }
 359                         } @packages_used));
 360                 Wprint "</p>\n";
 361                 }
 362
 363         for my $package (@packages_used) {
 364                 my $cvs_id=(eval('$'.$package."::CVS_ID")
 365 #                               || $package     # debug
 366                                 );
 367                 Wprint '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
 368                 }
 369
 370         do { &{$_}() if $_; } for ($W->{"footing"});
 371
 372         Wprint "</body></html>\n";
 373         exit(0);
 374 }
 375
 376 sub header (%)
 377 {
 378 my(%pairs)=@_;
 379
 380         while (my($key,$val)=each(%pairs)) {
 381                 do { cluck "Headers already sent"; next; } if $W->{"heading_done"};
 382                 for ($W->{"headers_lc"}{lc $key} || ()) {
 383                         delete $W->{"headers"}{$_};
 384                         }
 385                 $W->{"headers_lc"}{lc $key}=$key;
 386                 $W->{"headers"}{$key}=$val;
 387                 }
 388 }
 389
 390 sub size_display ($)
 391 {
 392 my($size)=@_;
 393
 394            if ($size<4096)
 395                 {}
 396         elsif ($size<1024*1024)
 397                 { $size=sprintf "%.1fK",$size/1024; }
 398         else
 399                 { $size=sprintf "%.1fM",$size/1024/1024; }
 400         $size.="B";
 401         return $size;
 402 }
 403
 404 sub url_is_local ($)
 405 {
 406 my($url)=@_;
 407
 408         return $url!~m#^[a-z]+://#;
 409 }
 410
 411 sub a_href ($;$%)
 412 {
 413 my($url,$contents,%args)=@_;
 414
 415         do { $$_=1 if !defined $$_; } for (\$args{"size"});
 416         if (!defined $contents) {
 417                 $contents=$url;
 418                 $contents=File::Basename::basename($contents) if $args{"basename"};
 419                 $contents=CGI::escapeHTML($contents);
 420                 }
 421         $contents=~s#<a\b[^>]*>##gi;
 422         $contents=~s#</a>##gi;
 423
 424         $url=top_dir($url) if url_is_local $url && $url=~m#^/#;
 425
 426         my $r='<a href="';
 427         my $urlent=CGI::escapeHTML($url);
 428            if ($url eq $urlent)
 429                 { $r.=$url; }
 430         elsif (url_is_local $url)
 431                 { $r.=$urlent; }
 432         elsif (defined $W->{"have_ent"} && !$W->{"have_ent"})   # non-ent client
 433                 { $r.=$url; }
 434         elsif ($W->{"have_ent"})        # ent client
 435                 { $r.=$urlent; }
 436         else    # unknown client, &CGI::escapeHTML should not be needed here
 437                 { $r.=CGI::escapeHTML(top_dir('/Redirect.pl?location='.uri_escape($url))); }
 438         $r.='"';
 439         do { $r.=" $_" if $_; } for ($args{"attr"});
 440         $r.='>'.$contents.'</a>';
 441         if ($args{"size"} && url_is_local($url) && ($args{"size"}>=2 || $url=~/[.](?:gz|Z|rpm|zip|deb|lha)/)) { # Downloadable?
 442                 $url=top_dir_disk().$url if $url=~m#^/#;
 443                 if (!-r $url)
 444                         { cluck "File not readable: $url"; }
 445                 else {
 446                         $r.='&nbsp;('.size_display((stat($url))[7]).')';
 447                         }
 448                 }
 449         return $r;
 450 }
 451
 452 sub remote_ip ()
 453 {
 454         # Do not: PerlModule                 Apache::ForwardedFor
 455         #         PerlPostReadRequestHandler Apache::ForwardedFor
 456         # As 'Apache::ForwardedFor' takes the first of $ENV{"HTTP_X_FORWARDED_FOR"}
 457         # while the contents is '127.0.0.1, 213.220.195.171' if client has its own proxy.
 458         # We must take the last item ourselves.
 459         my $r=$W->{"r"}->headers_in()->{"X-Forwarded-For"} || $W->{"r"}->get_remote_host();
 460         $r=~s/^.*,\s*//;
 461         return $r;
 462 }
 463
 464 sub is_cz ()
 465 {
 466         return 0 if !$have_Geo_IP;
 467         return "CZ" eq Geo::IP->new()->country_code_by_addr(remote_ip());
 468 }
 469
 470 sub a_href_cz ($$;%)
 471 {
 472 my($url,$contents,%args)=@_;
 473
 474         return a_href $url,$contents,%args if is_cz();
 475         return $contents;
 476 }
 477
 478 sub make ($)
 479 {
 480 my($cmd)=@_;
 481
 482         system {'flock'} 'flock','-x',top_dir_disk(),$cmd.' >&2';
 483 }
 484
 485 sub img_size ($$)
 486 {
 487 my($width,$height)=@_;
 488
 489         return ($W->{"have_style"} ? "style=\"border:0;width:${width}px;height:${height}px\"" : "border=\"0\"")
 490                         ." width=\"$width\" height=\"$height\"";
 491 }
 492
 493 sub negotiate_variant (%)
 494 {
 495 my(%args)=@_;
 496
 497         my @fields=("id","qs","content-type","encoding","charset","lang","size");
 498         return [ map(($args{$_}),@fields) ];
 499 }
 500
 501 my @img_variants=(
 502                 { "id"=>"png","qs"=>1.0,"content-type"=>"image/png" },
 503                 { "id"=>"gif","qs"=>0.9,"content-type"=>"image/gif" },
 504                 );
 505 my $img_variants_re='[.](?:'.join('|',"jpeg",map(($_->{"id"}),@img_variants)).')$';
 506
 507 sub img_src ($)
 508 {
 509 my($file_base)=@_;
 510
 511         if (!url_is_local($file_base)) {
 512                 return $file_base if !wantarray();
 513                 return ($file_base,$file_base);
 514                 }
 515         # Known image extension?
 516         if ($file_base=~m#$img_variants_re#o) {
 517                 return $file_base if !wantarray();
 518                 return ($file_base,$file_base) if $file_base!~m#^/#;
 519                 return (top_dir($file_base),top_dir_disk().$file_base);
 520                 }
 521
 522         my $file_base_disk;
 523         my $file_base_uri;
 524         if ($file_base!~m#^/#) {
 525                 $file_base_disk=$file_base_uri=$file_base;
 526                 }
 527         else {
 528                 $file_base_disk=top_dir_disk().$file_base;
 529                 $file_base_uri=top_dir($file_base);
 530                 }
 531
 532         my @nego_variants;
 533         for my $var (@img_variants) {
 534                 my $file=$file_base_disk.".".$var->{"id"};
 535                 # TODO: Somehow quickly check dependencies?
 536                 make('make -s --no-print-directory'
 537                                                 .' -C '."'".File::Basename::dirname($file)."' '".File::Basename::basename($file)."'")
 538                                 if !-f $file;
 539                 push @nego_variants,negotiate_variant(
 540                                 %$var,
 541                                 "size"=>(stat $file)[7],
 542                                 );
 543                 }
 544         # Do not: ,$W->{"r"});
 545         # but should we provide somehow either 'HTTP::Headers' or 'HTTP::Request' ?
 546         my $ext=HTTP::Negotiate::choose(\@nego_variants);
 547         $ext||=$img_variants[0]->{"id"};        # &HTTP::Negotiate::choose failed?
 548
 549         return $file_base_uri.".".$ext if !wantarray();
 550         return ($file_base_uri.".".$ext,$file_base_disk.".".$ext);
 551 }
 552
 553 sub img ($$;%)
 554 {
 555 my($file_base,$alt,%attr)=@_;
 556
 557         my($file_uri,$file_disk)=img_src $file_base;
 558         my($width,$height)=Image::Size::imgsize($file_disk);
 559         $alt=~s/<[^>]*>//g;
 560         $alt=CGI::escapeHTML($alt);
 561         my $content="<img src=\"$file_uri\" alt=\"$alt\" title=\"$alt\" ".img_size($width,$height)
 562                         .(!$attr{"attr"} ? "" : " ".$attr{"attr"})." />";
 563         return a_href img_src($attr{"a_href_img"}),$content if $attr{"a_href_img"};
 564         return a_href $attr{"a_href"},$content if $attr{"a_href"};
 565         return $content;
 566 }
 567
 568 sub centerimg
 569 {
 570         my $r.="";
 571         $r.='<table border="0" width="100%"><tr>'."\n";
 572         @_=( [@_] ) if !ref $_[0];
 573         for (@_) {
 574                 $r.="\t".'<td align="center">'.&{\&img}(@$_).'</td>'."\n";
 575                 }
 576         $r.='</tr></table>'."\n";
 577         return $r;
 578 }
 579
 580 sub rightimg
 581 {
 582 my($text,@args_img)=@_;
 583
 584         # Workaround bug of 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)':
 585         return <<"HERE";
 586 <table border="0" width="100%">
 587         <col width="@{[ (!$W->{"browser"}->ie() ? "1*" : "90%" ) ]}" />
 588         <col width="@{[ (!$W->{"browser"}->ie() ? "0*" : "10%" ) ]}" />
 589         <tr>
 590                 <td align="left">
 591                         @{[ $text ]}
 592                 </td>
 593                 <td align="right">
 594                         @{[ &{\&img}(@args_img) ]}
 595                 </td>
 596         </tr>
 597 </table>
 598 HERE
 599 }
 600
 601 sub readfile ($$)
 602 {
 603 my($class,$filename)=@_;
 604
 605         local *F;
 606         open F,$filename or die "Cannot open \"$filename\": $!";
 607         local $/=undef();
 608         my $data=<F>;
 609         close F;
 610         return $data;
 611 }
 612
 613 sub arr_keys (@)
 614 {
 615 my(@arr)=@_;
 616
 617         my @r=();
 618         while (@arr) {
 619                 push @r,shift @arr;     # key
 620                 shift @arr;     # val
 621                 }
 622         return @r;
 623 }
 624
 625 sub no_cache($)
 626 {
 627 my($self)=@_;
 628
 629         header("Expires"=>"Mon, 26 Jul 1997 05:00:00 GMT");     # date in the past
 630         header("Last-Modified"=>strftime("%a, %d %b %Y %H:%M:%S GMT",gmtime()));        # always modified
 631         header("Cache-Control"=>"no-cache, must-revalidate");   # HTTP/1.1
 632         header("Pragma"=>"no-cache");   # HTTP/1.0
 633 }
 634
 635 sub heading ()
 636 {
 637 my($class)=@_;
 638
 639         return if $W->{"heading_passed"}++;
 640
 641         # $ENV{"CLIENT_CHARSET"} ignored (mod_czech support dropped!)
 642         my $client_charset=$W->{"force_charset"} || "us-ascii";
 643         header("Content-Style-Type"=>"text/css");
 644         header("Content-Script-Type"=>"text/javascript");
 645         $class->no_cache() if $W->{"no_cache"};
 646
 647         while (my($key,$val)=each(%{$W->{"headers"}})) {
 648                 $W->{"r"}->header_out($key,$val);
 649                 }
 650         if (!$W->{"header_only"}) {
 651                 $W->{"r"}->send_http_header("text/html; charset=$client_charset");      # "Content-type"; do not use header()
 652                 }
 653
 654         return if $W->{"heading_done"}++;
 655         exit if $W->{"r"}->header_only();
 656         return if $W->{"header_only"};
 657
 658         if (1) { # || !$msie_major || $msie_major>=4) # TODO:dyn
 659                 Wprint '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n";
 660                 }
 661         Wprint '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
 662         Wprint '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">'."\n";
 663         my $title=$W->{"title_prefix"}.join("",map({ ': '.$_; } ($W->{"title"} || ())));
 664         $title=~s#<[^>]*>##g;
 665         Wprint "<head>";
 666         Wprint "<title>$title</title>\n";
 667
 668         if ($W->{"have_css"}) {
 669                 Wprint <<'HERE';
 670 <style type="text/css"><!--
 671 .cvs-id   { font-family: monospace; }
 672 .error    { color: red;   background-color: transparent; }
 673 .quote    { font-family: monospace; }
 674 .nowrap   { white-space: nowrap; }
 675 .centered { text-align: center; }
 676 .tab-bold { font-weight: bold; }
 677 .tab-head { font-weight: bold; }
 678 /*
 679 .tab-head { font-weight: bold; color: yellow; background-color: transparent; }
 680 body {
 681                 background-color: black;
 682                 color: white;
 683                 }
 684 :link    { color: aqua;   background-color: transparent; }
 685 :visited { color: teal;   background-color: transparent; }
 686 h1,h2    { color: yellow; background-color: transparent; }
 687 */
 688 td       { padding: 2px; }
 689 caption  { caption-side: bottom; }
 690 .footer img { vertical-align: middle; }
 691 HERE
 692                 Wprint $W->{"head_css"}."\n";
 693                 Wprint "--></style>\n";
 694                 }
 695
 696         Wprint '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
 697         Wprint $W->{"head"};
 698         for my $type (qw(prev next index contents start up)) {
 699                 do { Wprint '<link rel="'.$type.'" href="'.$_.'" />'."\n" if $_; } for ($W->{"rel_$type"});
 700                 }
 701         Wprint "</head><body";
 702 #       Wprint ' bgcolor="black" text="white" link="aqua" vlink="teal"'
 703 #                       if $W->{"browser"}->netscape() && (!$W->{"browser"}->major() || $W->{"browser"}->major()<=4);
 704         do { &{$_}($W) if $_; } for $W->{"body_attr_sub"};
 705         Wprint ">\n";
 706
 707         do { &{$_}() if $_; } for ($W->{"heading"});
 708 }
 709
 710 BEGIN {
 711         delete $W->{"__My::Web_init"};
 712         }
 713
 714 1;