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 ($W->{"detect_ent"}) {
 137                          if ($W->{"QUERY_STRING"}=~/[&]amp;have_ent/)
 138                         { $W->{"have_ent"}=0; }
 139                 elsif ($W->{"QUERY_STRING"}=~    /[&]have_ent/)
 140                         { $W->{"have_ent"}=1; }
 141                 else
 142                         { delete $W->{"have_ent"}; }
 143                 if (!defined $W->{"have_ent"} && $W->{"r"}->method() eq "GET") {
 144                         $W->{"head"}.='<meta http-equiv="Refresh" content="0; URL='
 145                                         .CGI::escapeHTML("http://".&{$W->{"web_hostname_sub"}}()."/".($W->{"r"}->uri()=~m#^/*(.*)$#)[0]
 146                                                         ."?".($W->{"QUERY_STRING"} || "detect_ent_glue=1").'&have_ent=detect')
 147                                         .'" />'."\n";
 148                         }
 149                 }
 150         $W->{"QUERY_STRING"}=~s/([&])amp;/$1/g;
 151         $W->{"r"}->args($W->{"QUERY_STRING"});
 152         # Workaround: &CGI::Vars behaves weird if strings passed both as POST data and in: $QUERY_STRING
 153         do { $W->{"r"}->args(""); delete $ENV{"QUERY_STRING"}; } if $W->{"r"}->method() eq "POST";
 154         # Do not: $W->{"r"}->args()
 155         # as it parses only QUERY_STRING (not POST data).
 156         $W->{"args"}={ CGI->new($W->{"r"})->Vars() };
 157         for my $name (keys(%{$W->{"args"}})) {
 158                 my @vals=split /\x00/,$W->{"args"}{$name};
 159                 next if @vals<=1;
 160                 $W->{"args"}{$name}=[@vals];
 161                 }
 162
 163         do { $W->{$_}=$W->{"r"}->headers_in()->{"Accept"}     if !defined $W->{$_}; } for ("accept");
 164         do { $W->{$_}=$W->{"r"}->headers_in()->{"User-Agent"} if !defined $W->{$_}; } for ("user_agent");
 165
 166         $W->{"browser"}=HTTP::BrowserDetect->new($W->{"user_agent"});
 167
 168         if (!defined $W->{"have_style"}) {
 169                 $W->{"have_style"}=(!$W->{"browser"}->netscape() || ($W->{"browser"}->major() && $W->{"browser"}->major()>4) ? 1 : 0);
 170                 }
 171
 172         $W->{"have_js"}=($W->{"args"}{"have_js"} ? 1 : 0);
 173         if ($W->{"detect_js"} && !$W->{"have_js"}) {
 174                 $W->{"head"}.='<script type="text/javascript" src="'.top_dir('/have_js.js.pl').'"></script>'."\n";
 175                 }
 176
 177         do { args_check(%$_) if $_; } for ($W->{"args_check"});
 178
 179         $ENV{"HOSTNAME"}||=&{$W->{"web_hostname_sub"}}();
 180
 181         return bless $W,$class;
 182 }
 183
 184 sub Wprint($)
 185 {
 186 my($text)=@_;
 187
 188         $W->{"r"}->puts($text);
 189 }
 190
 191 # local *FH;
 192 # tie *FH,ref($W),$W;
 193 sub TIEHANDLE($)
 194 {
 195 my($class,$W)=@_;
 196
 197         my $self={};
 198         $self->{"W"}=$W or confess "Missing W";
 199         return bless $self,$class;
 200 }
 201
 202 sub WRITE
 203 {
 204 my($self,$scalar,$length,$offset)=@_;
 205
 206         Wprint substr($scalar,0,$length);
 207 }
 208
 209 sub top_dir_disk ()
 210 {
 211         do { return $_ if $_; } for ($W->{"top_dir"});
 212         return $INC[0]; # fallback
 213 }
 214
 215 # $args{"abs"}
 216 sub top_dir (;$%)
 217 {
 218 my($in,%args)=@_;
 219
 220         if (my $uri=$W->{"r"}->unparsed_uri()) {
 221                 if ($W->{"args"}{"Wabs"} || $args{"abs"}) {
 222                         # FIXME: $in may not be defined here!
 223                         # to prevent: Use of uninitialized value in ...
 224                         if ($in=~m#^/#) {
 225                                 $in=~s#^/*##;
 226                                 }
 227                         else {
 228                                 $in=$uri."/".$in;
 229                                 $in=~tr#/#/#s;
 230                                 1 while $in=~s#/(?:[^/]+)/\Q..\E/#/#g
 231                                 }
 232                         return "http://".&{$W->{"web_hostname_sub"}}()."/".(defined $in ? $in : "");
 233                         }
 234                 $uri.="Index" if $uri=~m#/$#;
 235                 if (defined $in) {
 236                         my($inpath,$inquery)=split /[?]/,$in,2;
 237                         $inpath=~tr///cs;
 238                         $uri=~tr///cs;
 239                         for (;;) {
 240                                 my($in1 ,$in2 )=($in =~m#^(/[^/]+)(/.*)$#);
 241                                 my($uri1,$uri2)=($uri=~m#^(/[^/]+)(/.*)$#);
 242                                 last if !defined $in1 || !defined $uri1 || $in1 ne $uri1;
 243                                 $in=$in2;
 244                                 $uri=$uri2;
 245                                 }
 246                         }
 247                 $uri=~s#^/*##;
 248                 $uri=~s#[^/]+#..#g;
 249                 $uri=File::Basename::dirname($uri);
 250                 my $r=$uri.(defined $in ? $in : "");
 251 #               1 while $r=~s#^[.]/##;
 252 #               $r="./$r" if $r=~m#^(?:?.*)$#;  # empty pathname?
 253                 return $r;
 254                 }
 255         return top_dir_disk().$in;
 256 }
 257
 258 sub fatal (;$);
 259
 260 sub args_check (%)
 261 {
 262 my(%tmpl)=@_;
 263
 264         while (my($name,$regex)=each(%tmpl)) {
 265                 my $name_html="Parameter <span class=\"quote\">".CGI::escapeHTML($name)."</span>";
 266                 $W->{"args"}{$name}="" if !defined $W->{"args"}{$name};
 267                 $W->{"args"}{$name}=[ $W->{"args"}{$name} ] if !ref $W->{"args"}{$name} && ref $regex;
 268                 fatal "$name_html passed as multivar although singlevar expected"
 269                                 if ref $W->{"args"}{$name} && !ref $regex;
 270                 $regex=$regex->[0] if ref $regex;
 271                 for my $val (!ref $W->{"args"}{$name} ? $W->{"args"}{$name} : @{$W->{"args"}{$name}}) {
 272                         $val="" if !defined $val;
 273                         fatal "$name_html <span class=\"quote\">".CGI::escapeHTML($val)."</span>"
 274                                                         ." does not match the required regex <span class=\"quote\">".CGI::escapeHTML($regex)."</span> "
 275                                         if $regex ne "" && $val!~/$regex/;
 276                         }
 277                 }
 278 }
 279
 280 sub vskip (;$)
 281 {
 282 my($height)=@_;
 283
 284         return '<p'.(!defined $height ? "" : ' style="height: '.$height.';"').'>&nbsp;</p>'."\n";
 285 }
 286
 287 sub fatal (;$)
 288 {
 289 my($msg)=@_;
 290
 291         $msg="UNKNOWN" if !$msg;
 292         cluck "FATAL: $msg";
 293
 294         $W->{"indexme"}=0;      # For the case no heading was sent yet.
 295         $W->{"heading_done"}=0; # for the case of already sent {"header_only"}==1
 296         $W->{"header_only"}=0;  # assurance for &heading
 297         My::Web->heading();
 298         Wprint "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
 299                         ."<p>You can report this problem's details to"
 300                         ." ".a_href("mailto:".$W->{"admin_mail"},"admin of this website").".</p>\n";
 301         footer();
 302 }
 303
 304 sub footer (;$)
 305 {
 306         exit 1 if $W->{"footer_passed"}++;      # deadlock prevention:
 307
 308         Wprint vskip if $W->{"footer_delimit"};
 309
 310         do { &{$_}() if $_; } for ($W->{"footing_delimit"});
 311
 312         Wprint "<hr />\n" if $W->{"footer"};
 313
 314         if ($W->{"footer_mailme"}) {
 315                 Wprint '<form action="'.top_dir('/SendMsg.pl').'" method="post" onsubmit="'
 316                                 ."this.elements['msgscript'].value=this.elements['msghtml'].value;"
 317                                 ."this.elements['msghtml'].value='';"
 318                                 ."this.submit();"
 319                                 .'">'."\n";
 320                         Wprint input_hidden_persistents()."\n";
 321                         Wprint '<p align="right">'."\n";
 322                                 Wprint '<input name="msgscript" type="hidden" />'."\n";
 323                                 Wprint '<input name="msghtml" type="text" size="32" alt="Message" />'."\n";
 324                                 Wprint '<input name="submit" type="submit" value="Quick Note" />'."\n";
 325                         Wprint '</p>'."\n";
 326                 Wprint '</form>'."\n";
 327                 }
 328
 329         my @packages_used=(
 330                         $W->{"__PACKAGE__"},
 331                         __PACKAGE__,
 332                         @{$W->{"packages_used"}{"__My::Web"}},
 333                         map((!$_ ? () : @$_),$W->{"packages_used"}{$W->{"__PACKAGE__"}}),
 334                         );
 335         my %packages_used;
 336         @packages_used=grep((!$packages_used{$_}++),@packages_used);
 337         if ($W->{"footer_ids"}) {
 338                 Wprint '<p class="cvs-id">';
 339                 Wprint join("<br />\n",map({ my $package=$_;
 340                         my $cvs_id=(eval('$'.$package."::CVS_ID")
 341 #                                       || $package     # debug
 342                                         );
 343                         if (!$cvs_id) {
 344                                 ();
 345                                 }
 346                         else {
 347                                 $cvs_id='$'.$cvs_id.'$';        # Eaten by 'q' operator.
 348                                 my @cvs_id_split=split / +/,$cvs_id;
 349                                 if (@cvs_id_split==8) {
 350                                         my $file=$package;
 351                                         $file=~s#::#/#g;
 352                                         my $ext;
 353                                         my @tried;
 354                                         for (qw(.html.pl .pl .pm),"") {
 355                                                 $ext=$_;
 356                                                 my $pathname=top_dir_disk()."/$file$ext";
 357                                                 push @tried,$pathname;
 358                                                 last if -r $pathname;
 359                                                 cluck "Class file $file not found; tried: ".join(" ",@tried) if !$ext;
 360                                                 }
 361                                         $file.=$ext;
 362                                         $cvs_id_split[2]=""
 363                                                         .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $W->{"viewcvs"}))[0]."$file?rev=".$cvs_id_split[2],
 364                                                                         $cvs_id_split[2]);
 365                                         $cvs_id_split[1]=a_href($W->{"viewcvs"}.$file,
 366                                                         ($package!~/^Apache::/ ? $package : $cvs_id_split[1]));
 367                                         $cvs_id_split[5]=&{$W->{"cvs_id_author"}}($cvs_id_split[5]);
 368                                         }
 369                                 join " ",@cvs_id_split;
 370                                 }
 371                         } @packages_used));
 372                 Wprint "</p>\n";
 373                 }
 374
 375         for my $package (@packages_used) {
 376                 my $cvs_id=(eval('$'.$package."::CVS_ID")
 377 #                               || $package     # debug
 378                                 );
 379                 Wprint '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
 380                 }
 381
 382         do { &{$_}() if $_; } for ($W->{"footing"});
 383
 384         Wprint "</body></html>\n";
 385         exit(0);
 386 }
 387
 388 sub header (%)
 389 {
 390 my(%pairs)=@_;
 391
 392         while (my($key,$val)=each(%pairs)) {
 393                 do { cluck "Headers already sent"; next; } if $W->{"heading_done"};
 394                 for ($W->{"headers_lc"}{lc $key} || ()) {
 395                         delete $W->{"headers"}{$_};
 396                         }
 397                 $W->{"headers_lc"}{lc $key}=$key;
 398                 $W->{"headers"}{$key}=$val;
 399                 }
 400 }
 401
 402 sub size_display ($)
 403 {
 404 my($size)=@_;
 405
 406            if ($size<4096)
 407                 {}
 408         elsif ($size<1024*1024)
 409                 { $size=sprintf "%.1fK",$size/1024; }
 410         else
 411                 { $size=sprintf "%.1fM",$size/1024/1024; }
 412         $size.="B";
 413         return $size;
 414 }
 415
 416 sub url_is_local ($)
 417 {
 418 my($url)=@_;
 419
 420         return $url!~m#^[a-z]+://#;
 421 }
 422
 423 sub url_out($%)
 424 {
 425 my($url,%args)=@_;
 426
 427         return $url if !url_is_local $url;
 428         $url=top_dir($url,%args) if $url=~m#^/# || $args{"abs"};
 429
 430         my $uri=URI->new($url);
 431         for my $key (keys(%{$W->{"args_persistent"}})) {
 432                 my $val=$W->{"args"}{$key};
 433                 next if !defined $val;
 434                 $uri->query_param_append($key=>$val);
 435                 }
 436         $url="".$uri;
 437
 438         return $url;
 439 }
 440
 441 sub a_href ($;$%)
 442 {
 443 my($url,$contents,%args)=@_;
 444
 445         do { $$_=1 if !defined $$_; } for (\$args{"size"});
 446         if (!defined $contents) {
 447                 $contents=$url;
 448                 $contents=File::Basename::basename($contents) if $args{"basename"};
 449                 $contents=CGI::escapeHTML($contents);
 450                 }
 451         $contents=~s#<a\b[^>]*>##gi;
 452         $contents=~s#</a>##gi;
 453
 454         $url=url_out($url,%args);
 455
 456         my $r='<a href="';
 457         my $urlent=CGI::escapeHTML($url);
 458            if ($url eq $urlent)
 459                 { $r.=$url; }
 460         elsif (url_is_local $url)
 461                 { $r.=$urlent; }
 462         elsif (defined $W->{"have_ent"} && !$W->{"have_ent"})   # non-ent client
 463                 { $r.=$url; }
 464         elsif ($W->{"have_ent"})        # ent client
 465                 { $r.=$urlent; }
 466         else    # unknown client, &CGI::escapeHTML should not be needed here
 467                 { $r.=CGI::escapeHTML(top_dir('/Redirect.pl?location='.uri_escape($url))); }
 468         $r.='"';
 469         do { $r.=" $_" if $_; } for ($args{"attr"});
 470         $r.='>'.$contents.'</a>';
 471         if ($args{"size"} && url_is_local($url) && ($args{"size"}>=2 || $url=~/[.](?:gz|Z|rpm|zip|deb|lha)/)) { # Downloadable?
 472                 $url=top_dir_disk().$url if $url=~m#^/#;
 473                 if (!-r $url)
 474                         { cluck "File not readable: $url"; }
 475                 else {
 476                         $r.='&nbsp;('.size_display((stat($url))[7]).')';
 477                         }
 478                 }
 479         return $r;
 480 }
 481
 482 sub input_hidden_persistents()
 483 {
 484         return join("",map({
 485                 my $key=$_;
 486                 my $val=$W->{"args"}{$key};
 487                 (!defined $val ? () : '<input type="hidden"'
 488                                 .' name="'.CGI::escapeHTML($key).'"'
 489                                 .' value="'.CGI::escapeHTML($val).'"'
 490                                 .' />'."\n");
 491                 } (keys(%{$W->{"args_persistent"}}))));
 492 }
 493
 494 sub http_moved($$;$)
 495 {
 496 my($self,$url,$status)=@_;
 497
 498         $url=url_out($url,"abs"=>1);
 499         $status||=Apache::HTTP_MOVED_TEMPORARILY;
 500         $W->{"r"}->status($status);
 501         $W->{"r"}->header_out("Location"=>$url);
 502         $W->{"header_only"}=1;
 503         My::Web->heading();
 504         exit;
 505         die "NOTREACHED";
 506 }
 507
 508 sub remote_ip ()
 509 {
 510         # Do not: PerlModule                 Apache::ForwardedFor
 511         #         PerlPostReadRequestHandler Apache::ForwardedFor
 512         # As 'Apache::ForwardedFor' takes the first of $ENV{"HTTP_X_FORWARDED_FOR"}
 513         # while the contents is '127.0.0.1, 213.220.195.171' if client has its own proxy.
 514         # We must take the last item ourselves.
 515         my $r=$W->{"r"}->headers_in()->{"X-Forwarded-For"} || $W->{"r"}->get_remote_host();
 516         $r=~s/^.*,\s*//;
 517         return $r;
 518 }
 519
 520 sub is_cz ()
 521 {
 522         return 0 if !$have_Geo_IP;
 523         return "CZ" eq Geo::IP->new()->country_code_by_addr(remote_ip());
 524 }
 525
 526 sub a_href_cz ($$;%)
 527 {
 528 my($url,$contents,%args)=@_;
 529
 530         return a_href $url,$contents,%args if is_cz();
 531         return $contents;
 532 }
 533
 534 sub make ($)
 535 {
 536 my($cmd)=@_;
 537
 538         system {'flock'} 'flock','-x',top_dir_disk(),$cmd.' >&2';
 539 }
 540
 541 sub img_size ($$)
 542 {
 543 my($width,$height)=@_;
 544
 545         return ($W->{"have_style"} ? "style=\"border:0;width:${width}px;height:${height}px\"" : "border=\"0\"")
 546                         ." width=\"$width\" height=\"$height\"";
 547 }
 548
 549 sub negotiate_variant (%)
 550 {
 551 my(%args)=@_;
 552
 553         my @fields=("id","qs","content-type","encoding","charset","lang","size");
 554         return [ map(($args{$_}),@fields) ];
 555 }
 556
 557 my @img_variants=(
 558                 { "id"=>"png","qs"=>1.0,"content-type"=>"image/png" },
 559                 { "id"=>"gif","qs"=>0.9,"content-type"=>"image/gif" },
 560                 );
 561 my $img_variants_re='[.](?:'.join('|',"jpeg",map(($_->{"id"}),@img_variants)).')$';
 562
 563 sub img_src ($)
 564 {
 565 my($file_base)=@_;
 566
 567         if (!url_is_local($file_base)) {
 568                 return $file_base if !wantarray();
 569                 return ($file_base,$file_base);
 570                 }
 571         # Known image extension?
 572         if ($file_base=~m#$img_variants_re#o) {
 573                 return $file_base if !wantarray();
 574                 return ($file_base,$file_base) if $file_base!~m#^/#;
 575                 return (top_dir($file_base),top_dir_disk().$file_base);
 576                 }
 577
 578         my $file_base_disk;
 579         my $file_base_uri;
 580         if ($file_base!~m#^/#) {
 581                 $file_base_disk=$file_base_uri=$file_base;
 582                 }
 583         else {
 584                 $file_base_disk=top_dir_disk().$file_base;
 585                 $file_base_uri=top_dir($file_base);
 586                 }
 587
 588         my @nego_variants;
 589         for my $var (@img_variants) {
 590                 my $file=$file_base_disk.".".$var->{"id"};
 591                 # TODO: Somehow quickly check dependencies?
 592                 make('make -s --no-print-directory'
 593                                                 .' -C '."'".File::Basename::dirname($file)."' '".File::Basename::basename($file)."'")
 594                                 if !-f $file;
 595                 push @nego_variants,negotiate_variant(
 596                                 %$var,
 597                                 "size"=>(stat $file)[7],
 598                                 );
 599                 }
 600         # Do not: ,$W->{"r"});
 601         # but should we provide somehow either 'HTTP::Headers' or 'HTTP::Request' ?
 602         my $ext=HTTP::Negotiate::choose(\@nego_variants);
 603         $ext||=$img_variants[0]->{"id"};        # &HTTP::Negotiate::choose failed?
 604
 605         return $file_base_uri.".".$ext if !wantarray();
 606         return ($file_base_uri.".".$ext,$file_base_disk.".".$ext);
 607 }
 608
 609 sub img ($$;%)
 610 {
 611 my($file_base,$alt,%attr)=@_;
 612
 613         my($file_uri,$file_disk)=img_src $file_base;
 614         my($width,$height)=Image::Size::imgsize($file_disk);
 615         $alt=~s/<[^>]*>//g;
 616         $alt=CGI::escapeHTML($alt);
 617         my $content="<img src=\"$file_uri\" alt=\"$alt\" title=\"$alt\" ".img_size($width,$height)
 618                         .(!$attr{"attr"} ? "" : " ".$attr{"attr"})." />";
 619         return a_href img_src($attr{"a_href_img"}),$content if $attr{"a_href_img"};
 620         return a_href $attr{"a_href"},$content if $attr{"a_href"};
 621         return $content;
 622 }
 623
 624 sub centerimg
 625 {
 626         my $r.="";
 627         $r.='<table border="0" width="100%"><tr>'."\n";
 628         @_=( [@_] ) if !ref $_[0];
 629         for (@_) {
 630                 $r.="\t".'<td align="center">'.&{\&img}(@$_).'</td>'."\n";
 631                 }
 632         $r.='</tr></table>'."\n";
 633         return $r;
 634 }
 635
 636 sub rightimg
 637 {
 638 my($text,@args_img)=@_;
 639
 640         # Workaround bug of 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)':
 641         return <<"HERE";
 642 <table border="0" width="100%">
 643         <col width="@{[ (!$W->{"browser"}->ie() ? "1*" : "90%" ) ]}" />
 644         <col width="@{[ (!$W->{"browser"}->ie() ? "0*" : "10%" ) ]}" />
 645         <tr>
 646                 <td align="left">
 647                         @{[ $text ]}
 648                 </td>
 649                 <td align="right">
 650                         @{[ &{\&img}(@args_img) ]}
 651                 </td>
 652         </tr>
 653 </table>
 654 HERE
 655 }
 656
 657 sub readfile ($$)
 658 {
 659 my($class,$filename)=@_;
 660
 661         local *F;
 662         open F,$filename or die "Cannot open \"$filename\": $!";
 663         local $/=undef();
 664         my $data=<F>;
 665         close F;
 666         return $data;
 667 }
 668
 669 sub arr_keys (@)
 670 {
 671 my(@arr)=@_;
 672
 673         my @r=();
 674         while (@arr) {
 675                 push @r,shift @arr;     # key
 676                 shift @arr;     # val
 677                 }
 678         return @r;
 679 }
 680
 681 sub no_cache($)
 682 {
 683 my($self)=@_;
 684
 685         header("Expires"=>"Mon, 26 Jul 1997 05:00:00 GMT");     # date in the past
 686         header("Last-Modified"=>strftime("%a, %d %b %Y %H:%M:%S GMT",gmtime()));        # always modified
 687         header("Cache-Control"=>"no-cache, must-revalidate");   # HTTP/1.1
 688         header("Pragma"=>"no-cache");   # HTTP/1.0
 689 }
 690
 691 sub heading ()
 692 {
 693 my($class)=@_;
 694
 695         # $ENV{"CLIENT_CHARSET"} ignored (mod_czech support dropped!)
 696         my $client_charset=$W->{"force_charset"} || "us-ascii";
 697         header("Content-Style-Type"=>"text/css");
 698         header("Content-Script-Type"=>"text/javascript");
 699         $class->no_cache() if $W->{"no_cache"};
 700
 701         while (my($key,$val)=each(%{$W->{"headers"}})) {
 702                 $W->{"r"}->header_out($key,$val);
 703                 }
 704         if (!$W->{"header_only"}) {
 705                 $W->{"r"}->send_http_header("text/html; charset=$client_charset");      # "Content-type"; do not use header()
 706                 }
 707
 708         exit if $W->{"r"}->header_only();
 709         return if $W->{"header_only"};
 710         # We still can append headers before we put out some text.
 711         # FIXME: It is not clean to still append them without overwriting.
 712         return if $W->{"heading_done"}++;
 713
 714         if (1) { # || !$msie_major || $msie_major>=4) # TODO:dyn
 715                 Wprint '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n";
 716                 }
 717         Wprint '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
 718         Wprint '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">'."\n";
 719         my $title=$W->{"title_prefix"}.join("",map({ ': '.$_; } ($W->{"title"} || ())));
 720         $title=~s#<[^>]*>##g;
 721         Wprint "<head>";
 722         Wprint "<title>$title</title>\n";
 723
 724         if ($W->{"have_css"}) {
 725                 Wprint <<'HERE';
 726 <style type="text/css"><!--
 727 .cvs-id   { font-family: monospace; }
 728 .error    { color: red;   background-color: transparent; }
 729 .quote    { font-family: monospace; }
 730 .nowrap   { white-space: nowrap; }
 731 .centered { text-align: center; }
 732 .tab-bold { font-weight: bold; }
 733 .tab-head { font-weight: bold; }
 734 /*
 735 .tab-head { font-weight: bold; color: yellow; background-color: transparent; }
 736 body {
 737                 background-color: black;
 738                 color: white;
 739                 }
 740 :link    { color: aqua;   background-color: transparent; }
 741 :visited { color: teal;   background-color: transparent; }
 742 h1,h2    { color: yellow; background-color: transparent; }
 743 */
 744 td       { padding: 2px; }
 745 caption  { caption-side: bottom; }
 746 .footer img { vertical-align: middle; }
 747 HERE
 748                 Wprint $W->{"head_css"}."\n";
 749                 Wprint "--></style>\n";
 750                 }
 751
 752         Wprint '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
 753         Wprint $W->{"head"};
 754         for my $type (qw(prev next index contents start up)) {
 755                 do { Wprint '<link rel="'.$type.'" href="'.$_.'" />'."\n" if $_; } for ($W->{"rel_$type"});
 756                 }
 757         Wprint "</head><body";
 758 #       Wprint ' bgcolor="black" text="white" link="aqua" vlink="teal"'
 759 #                       if $W->{"browser"}->netscape() && (!$W->{"browser"}->major() || $W->{"browser"}->major()<=4);
 760         do { &{$_}($W) if $_; } for $W->{"body_attr_sub"};
 761         Wprint ">\n";
 762
 763         do { &{$_}() if $_; } for ($W->{"heading"});
 764 }
 765
 766 BEGIN {
 767         delete $W->{"__My::Web_init"};
 768         }
 769
 770 1;