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 &input_hidden_persistents);
  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 use Apache::Const qw(HTTP_MOVED_TEMPORARILY);
  81 use URI;
  82 use URI::QueryParam;
  83
  84
  85 #our $W;
  86                 # $W->{"title"}
  87                 # $W->{"head"}
  88                 # $W->{"head_css"}
  89                 # $W->{"force_charset"}
  90                 # $W->{"heading_done"}
  91                 # $W->{"footer_passed"}
  92                 # %{$W->{"headers"}}
  93                 # %{$W->{"headers_lc"}} # maps lc($headers_key)=>$headers_key
  94                 # @{$W->{"packages_used"}{$W->{"__PACKAGE__"}}}
  95                 # @{$W->{"packages_used"}{"__My::Web"}}
  96                 # %{$W->{"args"}}
  97
  98 sub init ($%)
  99 {
 100 my($class,%args)=@_;
 101
 102         print STDERR "$class->init ".Apache->request()->unparsed_uri()."\n";
 103
 104         my $packages_used_save=$W->{"packages_used"};
 105         $W={ %WebConfig,%args };        # override %WebConfig settings
 106         $W->{"packages_used"}=$packages_used_save;
 107
 108         # {"__PACKAGE__"} is mandatory for mod_perl-2.0;
 109         # $Apache::Registry::curstash is no longer supported.
 110         do { cluck "No $_" if !$W->{$_}; } for "__PACKAGE__";
 111
 112         $W->{"top_dir"}||=eval '$'.$W->{"__PACKAGE__"}.'::top_dir';
 113
 114         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_ent");
 115         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_js");
 116         do { $W->{$_}=1  if !defined $W->{$_}; } for ("have_css");      # AFAIK it does not hurt anyone.
 117         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer");
 118         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_delimit");
 119         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_mailme");
 120         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_ids");
 121         do { $W->{$_}=1  if !defined $W->{$_}; } for ("indexme");
 122         do { $W->{$_}="" if !defined $W->{$_}; } for ("head");
 123         do { $W->{$_}="" if !defined $W->{$_}; } for ("head_css");
 124
 125         my $footer_any=0;
 126         for (qw(footer_mailme footer_ids)) {
 127                 $W->{$_}=0 if !$W->{"footer"};
 128                 $footer_any=1 if $W->{$_};
 129                 }
 130         $W->{"footer"}=0 if !$footer_any;
 131         $W->{"footer_delimit"}=0 if !$W->{"footer"};
 132
 133         $W->{"r"}=Apache->request();
 134
 135         $W->{"QUERY_STRING"}=$W->{"r"}->args() || "";
 136            if ($W->{"QUERY_STRING"}=~/[&]amp;have_ent/)
 137                 { $W->{"have_ent"}=0; }
 138         elsif ($W->{"QUERY_STRING"}=~    /[&]have_ent/)
 139                 { $W->{"have_ent"}=1; }
 140         else
 141                 { delete $W->{"have_ent"}; }
 142         if ($W->{"detect_ent"} && !defined $W->{"have_ent"} && $W->{"r"}->method() eq "GET") {
 143                 $W->{"head"}.='<meta http-equiv="Refresh" content="0; URL='
 144                                 .CGI::escapeHTML("http://".&{$W->{"web_hostname_sub"}}()."/".($W->{"r"}->uri()=~m#^/*(.*)$#)[0]
 145                                                 ."?".($W->{"QUERY_STRING"} || "detect_ent_glue=1").'&have_ent=detect')
 146                                 .'" />'."\n";
 147                 }
 148         $W->{"QUERY_STRING"}=~s/([&])amp;/$1/g;
 149         $W->{"r"}->args($W->{"QUERY_STRING"});
 150         # Do not: $W->{"r"}->args()
 151         # as it parses only QUERY_STRING (not POST data).
 152         $W->{"args"}={ CGI->new($W->{"r"})->Vars() };
 153         for (keys(%{$W->{"args"}})) {
 154                 my @vals=split /\x00/,$W->{"args"}{$_};
 155                 next if @vals<=1;
 156                 $W->{"args"}{$_}=[@vals];
 157                 }
 158
 159         do { $W->{$_}=$W->{"r"}->headers_in()->{"Accept"}     if !defined $W->{$_}; } for ("accept");
 160         do { $W->{$_}=$W->{"r"}->headers_in()->{"User-Agent"} if !defined $W->{$_}; } for ("user_agent");
 161
 162         $W->{"browser"}=HTTP::BrowserDetect->new($W->{"user_agent"});
 163
 164         if (!defined $W->{"have_style"}) {
 165                 $W->{"have_style"}=(!$W->{"browser"}->netscape() || ($W->{"browser"}->major() && $W->{"browser"}->major()>4) ? 1 : 0);
 166                 }
 167
 168         $W->{"have_js"}=($W->{"args"}{"have_js"} ? 1 : 0);
 169         if ($W->{"detect_js"} && !$W->{"have_js"}) {
 170                 $W->{"head"}.='<script type="text/javascript" src="'.top_dir('/have_js.js.pl').'"></script>'."\n";
 171                 }
 172
 173         do { args_check(%$_) if $_; } for ($W->{"args_check"});
 174
 175         $ENV{"HOSTNAME"}||=&{$W->{"web_hostname_sub"}}();
 176
 177         return bless $W,$class;
 178 }
 179
 180 sub Wprint($)
 181 {
 182 my($text)=@_;
 183
 184         $W->{"r"}->puts($text);
 185 }
 186
 187 # local *FH;
 188 # tie *FH,ref($W),$W;
 189 sub TIEHANDLE($)
 190 {
 191 my($class,$W)=@_;
 192
 193         my $self={};
 194         $self->{"W"}=$W or confess "Missing W";
 195         return bless $self,$class;
 196 }
 197
 198 sub WRITE
 199 {
 200 my($self,$scalar,$length,$offset)=@_;
 201
 202         Wprint substr($scalar,0,$length);
 203 }
 204
 205 sub top_dir_disk ()
 206 {
 207         do { return $_ if $_; } for ($W->{"top_dir"});
 208         return $INC[0]; # fallback
 209 }
 210
 211 # $args{"abs"}
 212 sub top_dir (;$%)
 213 {
 214 my($in,%args)=@_;
 215
 216         if (my $uri=$W->{"r"}->unparsed_uri()) {
 217                 if ($W->{"args"}{"Wabs"} || $args{"abs"}) {
 218                         # FIXME: $in may not be defined here!
 219                         # to prevent: Use of uninitialized value in ...
 220                         if ($in=~m#^/#) {
 221                                 $in=~s#^/*##;
 222                                 }
 223                         else {
 224                                 $in=$uri."/".$in;
 225                                 $in=~tr#/#/#s;
 226                                 1 while $in=~s#/(?:[^/]+)/\Q..\E/#/#g
 227                                 }
 228                         return "http://".&{$W->{"web_hostname_sub"}}()."/".(defined $in ? $in : "");
 229                         }
 230                 $uri.="Index" if $uri=~m#/$#;
 231                 if (defined $in) {
 232                         my($inpath,$inquery)=split /[?]/,$in,2;
 233                         $inpath=~tr///cs;
 234                         $uri=~tr///cs;
 235                         for (;;) {
 236                                 my($in1 ,$in2 )=($in =~m#^(/[^/]+)(/.*)$#);
 237                                 my($uri1,$uri2)=($uri=~m#^(/[^/]+)(/.*)$#);
 238                                 last if !defined $in1 || !defined $uri1 || $in1 ne $uri1;
 239                                 $in=$in2;
 240                                 $uri=$uri2;
 241                                 }
 242                         }
 243                 $uri=~s#^/*##;
 244                 $uri=~s#[^/]+#..#g;
 245                 $uri=File::Basename::dirname($uri);
 246                 my $r=$uri.(defined $in ? $in : "");
 247 #               1 while $r=~s#^[.]/##;
 248 #               $r="./$r" if $r=~m#^(?:?.*)$#;  # empty pathname?
 249                 return $r;
 250                 }
 251         return top_dir_disk().$in;
 252 }
 253
 254 sub fatal (;$);
 255
 256 sub args_check (%)
 257 {
 258 my(%tmpl)=@_;
 259
 260         while (my($name,$regex)=each(%tmpl)) {
 261                 my $name_html="Parameter <span class=\"quote\">".CGI::escapeHTML($name)."</span>";
 262                 $W->{"args"}{$name}="" if !defined $W->{"args"}{$name};
 263                 $W->{"args"}{$name}=[ $W->{"args"}{$name} ] if !ref $W->{"args"}{$name} && ref $regex;
 264                 fatal "$name_html passed as multivar although singlevar expected"
 265                                 if ref $W->{"args"}{$name} && !ref $regex;
 266                 $regex=$regex->[0] if ref $regex;
 267                 for my $val (!ref $W->{"args"}{$name} ? $W->{"args"}{$name} : @{$W->{"args"}{$name}}) {
 268                         $val="" if !defined $val;
 269                         fatal "$name_html <span class=\"quote\">".CGI::escapeHTML($val)."</span>"
 270                                                         ." does not match the required regex <span class=\"quote\">".CGI::escapeHTML($regex)."</span> "
 271                                         if $regex ne "" && $val!~/$regex/;
 272                         }
 273                 }
 274 }
 275
 276 sub vskip (;$)
 277 {
 278 my($height)=@_;
 279
 280         return '<p'.(!defined $height ? "" : ' style="height: '.$height.';"').'>&nbsp;</p>'."\n";
 281 }
 282
 283 sub fatal (;$)
 284 {
 285 my($msg)=@_;
 286
 287         $msg="UNKNOWN" if !$msg;
 288
 289         $W->{"indexme"}=0;      # For the case no heading was sent yet.
 290         My::Web->heading();
 291         Wprint "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
 292                         ."<p>You can report this problem's details to"
 293                         ." ".a_href("mailto:".$W->{"admin_mail"},"admin of this website").".</p>\n";
 294         footer();
 295 }
 296
 297 sub footer (;$)
 298 {
 299         exit 1 if $W->{"footer_passed"}++;      # deadlock prevention:
 300
 301         Wprint vskip if $W->{"footer_delimit"};
 302
 303         do { &{$_}() if $_; } for ($W->{"footing_delimit"});
 304
 305         Wprint "<hr />\n" if $W->{"footer"};
 306
 307         if ($W->{"footer_mailme"}) {
 308                 Wprint '<form action="'.top_dir('/SendMsg.pl').'" method="post" onsubmit="'
 309                                 ."this.elements['msgscript'].value=this.elements['msghtml'].value;"
 310                                 ."this.elements['msghtml'].value='';"
 311                                 ."this.submit();"
 312                                 .'">'."\n";
 313                         Wprint input_hidden_persistents()."\n";
 314                         Wprint '<p align="right">'."\n";
 315                                 Wprint '<input name="msgscript" type="hidden" />'."\n";
 316                                 Wprint '<input name="msghtml" type="text" size="32" alt="Message" />'."\n";
 317                                 Wprint '<input name="submit" type="submit" value="Quick Note" />'."\n";
 318                         Wprint '</p>'."\n";
 319                 Wprint '</form>'."\n";
 320                 }
 321
 322         my @packages_used=(
 323                         $W->{"__PACKAGE__"},
 324                         __PACKAGE__,
 325                         @{$W->{"packages_used"}{"__My::Web"}},
 326                         map((!$_ ? () : @$_),$W->{"packages_used"}{$W->{"__PACKAGE__"}}),
 327                         );
 328         my %packages_used;
 329         @packages_used=grep((!$packages_used{$_}++),@packages_used);
 330         if ($W->{"footer_ids"}) {
 331                 Wprint '<p class="cvs-id">';
 332                 Wprint join("<br />\n",map({ my $package=$_;
 333                         my $cvs_id=(eval('$'.$package."::CVS_ID")
 334 #                                       || $package     # debug
 335                                         );
 336                         if (!$cvs_id) {
 337                                 ();
 338                                 }
 339                         else {
 340                                 $cvs_id='$'.$cvs_id.'$';        # Eaten by 'q' operator.
 341                                 my @cvs_id_split=split / +/,$cvs_id;
 342                                 if (@cvs_id_split==8) {
 343                                         my $file=$package;
 344                                         $file=~s#::#/#g;
 345                                         my $ext;
 346                                         my @tried;
 347                                         for (qw(.html.pl .pl .pm),"") {
 348                                                 $ext=$_;
 349                                                 my $pathname=top_dir_disk()."/$file$ext";
 350                                                 push @tried,$pathname;
 351                                                 last if -r $pathname;
 352                                                 cluck "Class file $file not found; tried: ".join(" ",@tried) if !$ext;
 353                                                 }
 354                                         $file.=$ext;
 355                                         $cvs_id_split[2]=""
 356                                                         .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $W->{"viewcvs"}))[0]."$file?rev=".$cvs_id_split[2],
 357                                                                         $cvs_id_split[2]);
 358                                         $cvs_id_split[1]=a_href($W->{"viewcvs"}.$file,
 359                                                         ($package!~/^Apache::/ ? $package : $cvs_id_split[1]));
 360                                         $cvs_id_split[5]=&{$W->{"cvs_id_author"}}($cvs_id_split[5]);
 361                                         }
 362                                 join " ",@cvs_id_split;
 363                                 }
 364                         } @packages_used));
 365                 Wprint "</p>\n";
 366                 }
 367
 368         for my $package (@packages_used) {
 369                 my $cvs_id=(eval('$'.$package."::CVS_ID")
 370 #                               || $package     # debug
 371                                 );
 372                 Wprint '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
 373                 }
 374
 375         do { &{$_}() if $_; } for ($W->{"footing"});
 376
 377         Wprint "</body></html>\n";
 378         exit(0);
 379 }
 380
 381 sub header (%)
 382 {
 383 my(%pairs)=@_;
 384
 385         while (my($key,$val)=each(%pairs)) {
 386                 do { cluck "Headers already sent"; next; } if $W->{"heading_done"};
 387                 for ($W->{"headers_lc"}{lc $key} || ()) {
 388                         delete $W->{"headers"}{$_};
 389                         }
 390                 $W->{"headers_lc"}{lc $key}=$key;
 391                 $W->{"headers"}{$key}=$val;
 392                 }
 393 }
 394
 395 sub size_display ($)
 396 {
 397 my($size)=@_;
 398
 399            if ($size<4096)
 400                 {}
 401         elsif ($size<1024*1024)
 402                 { $size=sprintf "%.1fK",$size/1024; }
 403         else
 404                 { $size=sprintf "%.1fM",$size/1024/1024; }
 405         $size.="B";
 406         return $size;
 407 }
 408
 409 sub url_is_local ($)
 410 {
 411 my($url)=@_;
 412
 413         return $url!~m#^[a-z]+://#;
 414 }
 415
 416 sub url_out($%)
 417 {
 418 my($url,%args)=@_;
 419
 420         return if !url_is_local $url;
 421         $url=top_dir($url,%args) if $url=~m#^/# || $args{"abs"};
 422
 423         my $uri=URI->new($url);
 424         for my $key (keys(%{$W->{"args_persistent"}})) {
 425                 my $val=$W->{"args"}{$key};
 426                 next if !defined $val;
 427                 $uri->query_param_append($key=>$val);
 428                 }
 429         $url="".$uri;
 430
 431         return $url;
 432 }
 433
 434 sub a_href ($;$%)
 435 {
 436 my($url,$contents,%args)=@_;
 437
 438         do { $$_=1 if !defined $$_; } for (\$args{"size"});
 439         if (!defined $contents) {
 440                 $contents=$url;
 441                 $contents=File::Basename::basename($contents) if $args{"basename"};
 442                 $contents=CGI::escapeHTML($contents);
 443                 }
 444         $contents=~s#<a\b[^>]*>##gi;
 445         $contents=~s#</a>##gi;
 446
 447         $url=url_out($url);
 448
 449         my $r='<a href="';
 450         my $urlent=CGI::escapeHTML($url);
 451            if ($url eq $urlent)
 452                 { $r.=$url; }
 453         elsif (url_is_local $url)
 454                 { $r.=$urlent; }
 455         elsif (defined $W->{"have_ent"} && !$W->{"have_ent"})   # non-ent client
 456                 { $r.=$url; }
 457         elsif ($W->{"have_ent"})        # ent client
 458                 { $r.=$urlent; }
 459         else    # unknown client, &CGI::escapeHTML should not be needed here
 460                 { $r.=CGI::escapeHTML(top_dir('/Redirect.pl?location='.uri_escape($url))); }
 461         $r.='"';
 462         do { $r.=" $_" if $_; } for ($args{"attr"});
 463         $r.='>'.$contents.'</a>';
 464         if ($args{"size"} && url_is_local($url) && ($args{"size"}>=2 || $url=~/[.](?:gz|Z|rpm|zip|deb|lha)/)) { # Downloadable?
 465                 $url=top_dir_disk().$url if $url=~m#^/#;
 466                 if (!-r $url)
 467                         { cluck "File not readable: $url"; }
 468                 else {
 469                         $r.='&nbsp;('.size_display((stat($url))[7]).')';
 470                         }
 471                 }
 472         return $r;
 473 }
 474
 475 sub input_hidden_persistents()
 476 {
 477         return join("",map({
 478                 my $key=$_;
 479                 my $val=$W->{"args"}{$key};
 480                 (!defined $val ? () : '<input type="hidden"'
 481                                 .' name="'.CGI::escapeHTML($key).'"'
 482                                 .' value="'.CGI::escapeHTML($val).'"'
 483                                 .' />'."\n");
 484                 } (keys(%{$W->{"args_persistent"}}))));
 485 }
 486
 487 sub http_moved($$;$)
 488 {
 489 my($self,$url,$status)=@_;
 490
 491         $url=url_out($url,"abs"=>1);
 492         $status||=Apache::HTTP_MOVED_TEMPORARILY;
 493         $W->{"r"}->status($status);
 494         $W->{"r"}->header_out("Location"=>$url);
 495         $W->{"header_only"}=1;
 496         My::Web->heading();
 497         exit;
 498         die "NOTREACHED";
 499 }
 500
 501 sub remote_ip ()
 502 {
 503         # Do not: PerlModule                 Apache::ForwardedFor
 504         #         PerlPostReadRequestHandler Apache::ForwardedFor
 505         # As 'Apache::ForwardedFor' takes the first of $ENV{"HTTP_X_FORWARDED_FOR"}
 506         # while the contents is '127.0.0.1, 213.220.195.171' if client has its own proxy.
 507         # We must take the last item ourselves.
 508         my $r=$W->{"r"}->headers_in()->{"X-Forwarded-For"} || $W->{"r"}->get_remote_host();
 509         $r=~s/^.*,\s*//;
 510         return $r;
 511 }
 512
 513 sub is_cz ()
 514 {
 515         return 0 if !$have_Geo_IP;
 516         return "CZ" eq Geo::IP->new()->country_code_by_addr(remote_ip());
 517 }
 518
 519 sub a_href_cz ($$;%)
 520 {
 521 my($url,$contents,%args)=@_;
 522
 523         return a_href $url,$contents,%args if is_cz();
 524         return $contents;
 525 }
 526
 527 sub make ($)
 528 {
 529 my($cmd)=@_;
 530
 531         system {'flock'} 'flock','-x',top_dir_disk(),$cmd.' >&2';
 532 }
 533
 534 sub img_size ($$)
 535 {
 536 my($width,$height)=@_;
 537
 538         return ($W->{"have_style"} ? "style=\"border:0;width:${width}px;height:${height}px\"" : "border=\"0\"")
 539                         ." width=\"$width\" height=\"$height\"";
 540 }
 541
 542 sub negotiate_variant (%)
 543 {
 544 my(%args)=@_;
 545
 546         my @fields=("id","qs","content-type","encoding","charset","lang","size");
 547         return [ map(($args{$_}),@fields) ];
 548 }
 549
 550 my @img_variants=(
 551                 { "id"=>"png","qs"=>1.0,"content-type"=>"image/png" },
 552                 { "id"=>"gif","qs"=>0.9,"content-type"=>"image/gif" },
 553                 );
 554 my $img_variants_re='[.](?:'.join('|',"jpeg",map(($_->{"id"}),@img_variants)).')$';
 555
 556 sub img_src ($)
 557 {
 558 my($file_base)=@_;
 559
 560         if (!url_is_local($file_base)) {
 561                 return $file_base if !wantarray();
 562                 return ($file_base,$file_base);
 563                 }
 564         # Known image extension?
 565         if ($file_base=~m#$img_variants_re#o) {
 566                 return $file_base if !wantarray();
 567                 return ($file_base,$file_base) if $file_base!~m#^/#;
 568                 return (top_dir($file_base),top_dir_disk().$file_base);
 569                 }
 570
 571         my $file_base_disk;
 572         my $file_base_uri;
 573         if ($file_base!~m#^/#) {
 574                 $file_base_disk=$file_base_uri=$file_base;
 575                 }
 576         else {
 577                 $file_base_disk=top_dir_disk().$file_base;
 578                 $file_base_uri=top_dir($file_base);
 579                 }
 580
 581         my @nego_variants;
 582         for my $var (@img_variants) {
 583                 my $file=$file_base_disk.".".$var->{"id"};
 584                 # TODO: Somehow quickly check dependencies?
 585                 make('make -s --no-print-directory'
 586                                                 .' -C '."'".File::Basename::dirname($file)."' '".File::Basename::basename($file)."'")
 587                                 if !-f $file;
 588                 push @nego_variants,negotiate_variant(
 589                                 %$var,
 590                                 "size"=>(stat $file)[7],
 591                                 );
 592                 }
 593         # Do not: ,$W->{"r"});
 594         # but should we provide somehow either 'HTTP::Headers' or 'HTTP::Request' ?
 595         my $ext=HTTP::Negotiate::choose(\@nego_variants);
 596         $ext||=$img_variants[0]->{"id"};        # &HTTP::Negotiate::choose failed?
 597
 598         return $file_base_uri.".".$ext if !wantarray();
 599         return ($file_base_uri.".".$ext,$file_base_disk.".".$ext);
 600 }
 601
 602 sub img ($$;%)
 603 {
 604 my($file_base,$alt,%attr)=@_;
 605
 606         my($file_uri,$file_disk)=img_src $file_base;
 607         my($width,$height)=Image::Size::imgsize($file_disk);
 608         $alt=~s/<[^>]*>//g;
 609         $alt=CGI::escapeHTML($alt);
 610         my $content="<img src=\"$file_uri\" alt=\"$alt\" title=\"$alt\" ".img_size($width,$height)
 611                         .(!$attr{"attr"} ? "" : " ".$attr{"attr"})." />";
 612         return a_href img_src($attr{"a_href_img"}),$content if $attr{"a_href_img"};
 613         return a_href $attr{"a_href"},$content if $attr{"a_href"};
 614         return $content;
 615 }
 616
 617 sub centerimg
 618 {
 619         my $r.="";
 620         $r.='<table border="0" width="100%"><tr>'."\n";
 621         @_=( [@_] ) if !ref $_[0];
 622         for (@_) {
 623                 $r.="\t".'<td align="center">'.&{\&img}(@$_).'</td>'."\n";
 624                 }
 625         $r.='</tr></table>'."\n";
 626         return $r;
 627 }
 628
 629 sub rightimg
 630 {
 631 my($text,@args_img)=@_;
 632
 633         # Workaround bug of 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)':
 634         return <<"HERE";
 635 <table border="0" width="100%">
 636         <col width="@{[ (!$W->{"browser"}->ie() ? "1*" : "90%" ) ]}" />
 637         <col width="@{[ (!$W->{"browser"}->ie() ? "0*" : "10%" ) ]}" />
 638         <tr>
 639                 <td align="left">
 640                         @{[ $text ]}
 641                 </td>
 642                 <td align="right">
 643                         @{[ &{\&img}(@args_img) ]}
 644                 </td>
 645         </tr>
 646 </table>
 647 HERE
 648 }
 649
 650 sub readfile ($$)
 651 {
 652 my($class,$filename)=@_;
 653
 654         local *F;
 655         open F,$filename or die "Cannot open \"$filename\": $!";
 656         local $/=undef();
 657         my $data=<F>;
 658         close F;
 659         return $data;
 660 }
 661
 662 sub arr_keys (@)
 663 {
 664 my(@arr)=@_;
 665
 666         my @r=();
 667         while (@arr) {
 668                 push @r,shift @arr;     # key
 669                 shift @arr;     # val
 670                 }
 671         return @r;
 672 }
 673
 674 sub no_cache($)
 675 {
 676 my($self)=@_;
 677
 678         header("Expires"=>"Mon, 26 Jul 1997 05:00:00 GMT");     # date in the past
 679         header("Last-Modified"=>strftime("%a, %d %b %Y %H:%M:%S GMT",gmtime()));        # always modified
 680         header("Cache-Control"=>"no-cache, must-revalidate");   # HTTP/1.1
 681         header("Pragma"=>"no-cache");   # HTTP/1.0
 682 }
 683
 684 sub heading ()
 685 {
 686 my($class)=@_;
 687
 688         return if $W->{"heading_passed"}++;
 689
 690         # $ENV{"CLIENT_CHARSET"} ignored (mod_czech support dropped!)
 691         my $client_charset=$W->{"force_charset"} || "us-ascii";
 692         header("Content-Style-Type"=>"text/css");
 693         header("Content-Script-Type"=>"text/javascript");
 694         $class->no_cache() if $W->{"no_cache"};
 695
 696         while (my($key,$val)=each(%{$W->{"headers"}})) {
 697                 $W->{"r"}->header_out($key,$val);
 698                 }
 699         if (!$W->{"header_only"}) {
 700                 $W->{"r"}->send_http_header("text/html; charset=$client_charset");      # "Content-type"; do not use header()
 701                 }
 702
 703         return if $W->{"heading_done"}++;
 704         exit if $W->{"r"}->header_only();
 705         return if $W->{"header_only"};
 706
 707         if (1) { # || !$msie_major || $msie_major>=4) # TODO:dyn
 708                 Wprint '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n";
 709                 }
 710         Wprint '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
 711         Wprint '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">'."\n";
 712         my $title=$W->{"title_prefix"}.join("",map({ ': '.$_; } ($W->{"title"} || ())));
 713         $title=~s#<[^>]*>##g;
 714         Wprint "<head>";
 715         Wprint "<title>$title</title>\n";
 716
 717         if ($W->{"have_css"}) {
 718                 Wprint <<'HERE';
 719 <style type="text/css"><!--
 720 .cvs-id   { font-family: monospace; }
 721 .error    { color: red;   background-color: transparent; }
 722 .quote    { font-family: monospace; }
 723 .nowrap   { white-space: nowrap; }
 724 .centered { text-align: center; }
 725 .tab-bold { font-weight: bold; }
 726 .tab-head { font-weight: bold; }
 727 /*
 728 .tab-head { font-weight: bold; color: yellow; background-color: transparent; }
 729 body {
 730                 background-color: black;
 731                 color: white;
 732                 }
 733 :link    { color: aqua;   background-color: transparent; }
 734 :visited { color: teal;   background-color: transparent; }
 735 h1,h2    { color: yellow; background-color: transparent; }
 736 */
 737 td       { padding: 2px; }
 738 caption  { caption-side: bottom; }
 739 .footer img { vertical-align: middle; }
 740 HERE
 741                 Wprint $W->{"head_css"}."\n";
 742                 Wprint "--></style>\n";
 743                 }
 744
 745         Wprint '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
 746         Wprint $W->{"head"};
 747         for my $type (qw(prev next index contents start up)) {
 748                 do { Wprint '<link rel="'.$type.'" href="'.$_.'" />'."\n" if $_; } for ($W->{"rel_$type"});
 749                 }
 750         Wprint "</head><body";
 751 #       Wprint ' bgcolor="black" text="white" link="aqua" vlink="teal"'
 752 #                       if $W->{"browser"}->netscape() && (!$W->{"browser"}->major() || $W->{"browser"}->major()<=4);
 753         do { &{$_}($W) if $_; } for $W->{"body_attr_sub"};
 754         Wprint ">\n";
 755
 756         do { &{$_}() if $_; } for ($W->{"heading"});
 757 }
 758
 759 BEGIN {
 760         delete $W->{"__My::Web_init"};
 761         }
 762
 763 1;