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 $W->{"__My::Web_init"};
  49                 if ($who) {
  50                         my $aref=($W->{"packages_used"}{$who}||=[]);
  51                         push @$aref,$class
  52                                         if !{ map(($_=>1),@$aref) }->{$class};  # Prevent duplicated entries.
  53                         }
  54                 CORE::require $file;
  55                 1;      # Otherwise 'require' would already file above.
  56         }
  57
  58         sub Wuse ($@)
  59         {
  60         my($file,@list)=@_;
  61
  62 #               print STDERR "Wuse $file\n";
  63                 Wrequire $file;
  64                 local $Exporter::ExportLevel=$Exporter::ExportLevel+1;
  65                 $file->import(@list);
  66                 1;
  67         }
  68 }
  69
  70 BEGIN { Wuse 'WebConfig'; }     # for %WebConfig
  71 require CGI;    # for &escapeHTML
  72 require Image::Size;    # for &imgsize
  73 use File::Basename;     # &basename
  74 use Carp qw(cluck confess);
  75 use URI::Escape;
  76 require HTTP::BrowserDetect;
  77 require HTTP::Negotiate;
  78 my $have_Geo_IP; BEGIN { $have_Geo_IP=eval { require Geo::IP; 1; }; }
  79 use ModPerl::Util qw(exit);
  80 use POSIX qw(strftime);
  81 use Tie::Handle;
  82 use Apache::Const qw(HTTP_MOVED_TEMPORARILY);
  83 use URI;
  84 use URI::QueryParam;
  85
  86
  87 #our $W;
  88                 # $W->{"title"}
  89                 # $W->{"head"}
  90                 # $W->{"force_charset"}
  91                 # $W->{"heading_done"}
  92                 # $W->{"footer_passed"}
  93                 # %{$W->{"headers"}}
  94                 # %{$W->{"headers_lc"}} # maps lc($headers_key)=>$headers_key
  95                 # @{$W->{"packages_used"}{$W->{"__PACKAGE__"}}}
  96                 # @{$W->{"packages_used"}{"__My::Web"}}
  97                 # %{$W->{"args"}}
  98
  99 sub init ($%)
 100 {
 101 my($class,%args)=@_;
 102
 103         print STDERR "$class->init ".Apache->request()->unparsed_uri()."\n";
 104
 105         my $packages_used_save=$W->{"packages_used"};
 106         $W={ %WebConfig,%args };        # override %WebConfig settings
 107         $W->{"packages_used"}=$packages_used_save;
 108
 109         # {"__PACKAGE__"} is mandatory for mod_perl-2.0;
 110         # $Apache::Registry::curstash is no longer supported.
 111         do { cluck "No $_" if !$W->{$_}; } for "__PACKAGE__";
 112
 113         $W->{"top_dir"}||=eval '$'.$W->{"__PACKAGE__"}.'::top_dir';
 114
 115         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_ent");
 116         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_js");
 117         do { $W->{$_}=1  if !defined $W->{$_}; } for ("have_css");      # AFAIK it does not hurt anyone.
 118         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer");
 119         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_delimit");
 120         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_mailme");
 121         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_ids");
 122         do { $W->{$_}=1  if !defined $W->{$_}; } for ("indexme");
 123         do { $W->{$_}="" if !defined $W->{$_}; } for ("head");
 124         do { $W->{$_}="" if !defined $W->{$_}; } for ("body_attr");
 125         do { $W->{$_}="en-US" if !defined $W->{$_}; } for ("language");
 126
 127         my $footer_any=0;
 128         for (qw(footer_mailme footer_ids)) {
 129                 $W->{$_}=0 if !$W->{"footer"};
 130                 $footer_any=1 if $W->{$_};
 131                 }
 132         $W->{"footer"}=0 if !$footer_any;
 133         $W->{"footer_delimit"}=0 if !$W->{"footer"};
 134
 135         $W->{"r"}=Apache->request();
 136
 137         $W->{"QUERY_STRING"}=$W->{"r"}->args() || "";
 138         if ($W->{"detect_ent"}) {
 139                          if ($W->{"QUERY_STRING"}=~/[&]amp;have_ent/)
 140                         { $W->{"have_ent"}=0; }
 141                 elsif ($W->{"QUERY_STRING"}=~    /[&]have_ent/)
 142                         { $W->{"have_ent"}=1; }
 143                 else
 144                         { delete $W->{"have_ent"}; }
 145                 if (!defined $W->{"have_ent"} && $W->{"r"}->method() eq "GET") {
 146                         $W->{"head"}.='<meta http-equiv="Refresh" content="0; URL='
 147                                         .CGI::escapeHTML("http://".&{$W->{"web_hostname_sub"}}()."/".($W->{"r"}->uri()=~m#^/*(.*)$#)[0]
 148                                                         ."?".($W->{"QUERY_STRING"} || "detect_ent_glue=1").'&have_ent=detect')
 149                                         .'" />'."\n";
 150                         }
 151                 }
 152         $W->{"QUERY_STRING"}=~s/([&])amp;/$1/g;
 153         $W->{"r"}->args($W->{"QUERY_STRING"});
 154         # Workaround: &CGI::Vars behaves weird if strings passed both as POST data and in: $QUERY_STRING
 155         do { $W->{"r"}->args(""); delete $ENV{"QUERY_STRING"}; } if $W->{"r"}->method() eq "POST";
 156         # Do not: $W->{"r"}->args()
 157         # as it parses only QUERY_STRING (not POST data).
 158         $W->{"args"}={ CGI->new($W->{"r"})->Vars() };
 159         for my $name (keys(%{$W->{"args"}})) {
 160                 my @vals=split /\x00/,$W->{"args"}{$name};
 161                 next if @vals<=1;
 162                 $W->{"args"}{$name}=[@vals];
 163                 }
 164
 165         do { $W->{$_}=$W->{"r"}->headers_in()->{"Accept"}     if !defined $W->{$_}; } for ("accept");
 166         do { $W->{$_}=$W->{"r"}->headers_in()->{"User-Agent"} if !defined $W->{$_}; } for ("user_agent");
 167
 168         $W->{"browser"}=HTTP::BrowserDetect->new($W->{"user_agent"});
 169
 170         if (!defined $W->{"have_style"}) {
 171                 $W->{"have_style"}=(!$W->{"browser"}->netscape() || ($W->{"browser"}->major() && $W->{"browser"}->major()>4) ? 1 : 0);
 172                 }
 173
 174         $W->{"have_js"}=($W->{"args"}{"have_js"} ? 1 : 0);
 175         if ($W->{"detect_js"} && !$W->{"have_js"}) {
 176                 $W->{"head"}.='<script type="text/javascript" src="'.top_dir('/have_js.js.pl').'"></script>'."\n";
 177                 }
 178
 179         do { args_check(%$_) if $_; } for ($W->{"args_check"});
 180
 181         $ENV{"HOSTNAME"}||=&{$W->{"web_hostname_sub"}}();
 182
 183         return bless $W,$class;
 184 }
 185
 186 sub Wprint($)
 187 {
 188 my($text)=@_;
 189
 190         $W->{"r"}->puts($text);
 191 }
 192
 193 # local *FH;
 194 # tie *FH,ref($W),$W;
 195 sub TIEHANDLE($)
 196 {
 197 my($class,$W)=@_;
 198
 199         my $self={};
 200         $self->{"W"}=$W or confess "Missing W";
 201         return bless $self,$class;
 202 }
 203
 204 sub WRITE
 205 {
 206 my($self,$scalar,$length,$offset)=@_;
 207
 208         Wprint substr($scalar,0,$length);
 209 }
 210
 211 sub top_dir_disk ()
 212 {
 213         do { return $_ if $_; } for ($W->{"top_dir"});
 214         return $INC[0]; # fallback
 215 }
 216
 217 # $args{"abs"}
 218 sub top_dir (;$%)
 219 {
 220 my($in,%args)=@_;
 221
 222         if (my $uri=$W->{"r"}->unparsed_uri()) {
 223                 if ($W->{"args"}{"Wabs"} || $args{"abs"}) {
 224                         # FIXME: $in may not be defined here!
 225                         # to prevent: Use of uninitialized value in ...
 226                         if ($in=~m#^/#) {
 227                                 $in=~s#^/*##;
 228                                 }
 229                         else {
 230                                 $in=$uri."/".$in;
 231                                 $in=~tr#/#/#s;
 232                                 1 while $in=~s#/(?:[^/]+)/\Q..\E/#/#g
 233                                 }
 234                         return "http://".&{$W->{"web_hostname_sub"}}()."/".(defined $in ? $in : "");
 235                         }
 236                 $uri.="Index" if $uri=~m#/$#;
 237                 if (defined $in) {
 238                         my($inpath,$inquery)=split /[?]/,$in,2;
 239                         $inpath=~tr///cs;
 240                         $uri=~tr///cs;
 241                         for (;;) {
 242                                 my($in1 ,$in2 )=($in =~m#^(/[^/]+)(/.*)$#);
 243                                 my($uri1,$uri2)=($uri=~m#^(/[^/]+)(/.*)$#);
 244                                 last if !defined $in1 || !defined $uri1 || $in1 ne $uri1;
 245                                 $in=$in2;
 246                                 $uri=$uri2;
 247                                 }
 248                         }
 249                 $uri=~s#^/*##;
 250                 $uri=~s#[^/]+#..#g;
 251                 $uri=File::Basename::dirname($uri);
 252                 my $r=$uri.(defined $in ? $in : "");
 253 #               1 while $r=~s#^[.]/##;
 254 #               $r="./$r" if $r=~m#^(?:?.*)$#;  # empty pathname?
 255                 return $r;
 256                 }
 257         return top_dir_disk().$in;
 258 }
 259
 260 sub fatal (;$);
 261
 262 sub args_check (%)
 263 {
 264 my(%tmpl)=@_;
 265
 266         while (my($name,$regex)=each(%tmpl)) {
 267                 my $name_html="Parameter <span class=\"quote\">".CGI::escapeHTML($name)."</span>";
 268                 $W->{"args"}{$name}="" if !defined $W->{"args"}{$name};
 269                 $W->{"args"}{$name}=[ $W->{"args"}{$name} ] if !ref $W->{"args"}{$name} && ref $regex;
 270                 fatal "$name_html passed as multivar although singlevar expected"
 271                                 if ref $W->{"args"}{$name} && !ref $regex;
 272                 $regex=$regex->[0] if ref $regex;
 273                 for my $val (!ref $W->{"args"}{$name} ? $W->{"args"}{$name} : @{$W->{"args"}{$name}}) {
 274                         $val="" if !defined $val;
 275                         fatal "$name_html <span class=\"quote\">".CGI::escapeHTML($val)."</span>"
 276                                                         ." does not match the required regex <span class=\"quote\">".CGI::escapeHTML($regex)."</span> "
 277                                         if $regex ne "" && $val!~/$regex/;
 278                         }
 279                 }
 280 }
 281
 282 sub vskip (;$)
 283 {
 284 my($height)=@_;
 285
 286         return '<p'.(!defined $height ? "" : ' style="height: '.$height.';"').'>&nbsp;</p>'."\n";
 287 }
 288
 289 sub fatal (;$)
 290 {
 291 my($msg)=@_;
 292
 293         $msg="UNKNOWN" if !$msg;
 294         cluck "FATAL: $msg";
 295
 296         $W->{"indexme"}=0;      # For the case no heading was sent yet.
 297         $W->{"heading_done"}=0; # for the case of already sent {"header_only"}==1
 298         $W->{"header_only"}=0;  # assurance for &heading
 299         My::Web->heading();
 300         Wprint "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
 301                         ."<p>You can report this problem's details to"
 302                         ." ".a_href("mailto:".$W->{"admin_mail"},"admin of this website").".</p>\n";
 303         footer();
 304 }
 305
 306 sub footer (;$)
 307 {
 308         exit 1 if $W->{"footer_passed"}++;      # deadlock prevention:
 309
 310         Wprint vskip if $W->{"footer_delimit"};
 311
 312         do { &{$_}() if $_; } for ($W->{"footing_delimit"});
 313
 314         Wprint "<hr />\n" if $W->{"footer"};
 315
 316         if ($W->{"footer_mailme"}) {
 317                 Wprint '<form action="'.top_dir('/SendMsg.pl').'" method="post" onsubmit="'
 318                                 ."this.elements['msgscript'].value=this.elements['msghtml'].value;"
 319                                 ."this.elements['msghtml'].value='';"
 320                                 ."this.submit();"
 321                                 .'">'."\n";
 322                         Wprint input_hidden_persistents()."\n";
 323                         Wprint '<p align="right">'."\n";
 324                                 Wprint '<input name="msgscript" type="hidden" />'."\n";
 325                                 Wprint '<input name="msghtml" type="text" size="32" alt="Message" />'."\n";
 326                                 Wprint '<input name="submit" type="submit" value="Quick Note" />'."\n";
 327                         Wprint '</p>'."\n";
 328                 Wprint '</form>'."\n";
 329                 }
 330
 331         my @packages_used=(
 332                         $W->{"__PACKAGE__"},
 333                         __PACKAGE__,
 334                         @{$W->{"packages_used"}{"__My::Web"}},
 335                         map((!$_ ? () : @$_),$W->{"packages_used"}{$W->{"__PACKAGE__"}}),
 336                         );
 337         my %packages_used;
 338         @packages_used=grep((!$packages_used{$_}++),@packages_used);
 339         if ($W->{"footer_ids"}) {
 340                 Wprint '<p class="cvs-id">';
 341                 Wprint join("<br />\n",map({ my $package=$_;
 342                         my $cvs_id=(eval('$'.$package."::CVS_ID")
 343 #                                       || $package     # debug
 344                                         );
 345                         if (!$cvs_id) {
 346                                 ();
 347                                 }
 348                         else {
 349                                 $cvs_id='$'.$cvs_id.'$';        # Eaten by 'q' operator.
 350                                 my @cvs_id_split=split / +/,$cvs_id;
 351                                 if (@cvs_id_split==8) {
 352                                         my $file=$package;
 353                                         $file=~s#::#/#g;
 354                                         my $ext;
 355                                         my @tried;
 356                                         for (qw(.html.pl .pl .pm),"") {
 357                                                 $ext=$_;
 358                                                 my $pathname=top_dir_disk()."/$file$ext";
 359                                                 push @tried,$pathname;
 360                                                 last if -r $pathname;
 361                                                 cluck "Class file $file not found; tried: ".join(" ",@tried) if !$ext;
 362                                                 }
 363                                         $file.=$ext;
 364                                         $cvs_id_split[2]=""
 365                                                         .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $W->{"viewcvs"}))[0]."$file?rev=".$cvs_id_split[2],
 366                                                                         $cvs_id_split[2]);
 367                                         $cvs_id_split[1]=a_href($W->{"viewcvs"}.$file,
 368                                                         ($package!~/^Apache::/ ? $package : $cvs_id_split[1]));
 369                                         $cvs_id_split[5]=&{$W->{"cvs_id_author"}}($cvs_id_split[5]);
 370                                         }
 371                                 join " ",@cvs_id_split;
 372                                 }
 373                         } @packages_used));
 374                 Wprint "</p>\n";
 375                 }
 376
 377         for my $package (@packages_used) {
 378                 my $cvs_id=(eval('$'.$package."::CVS_ID")
 379 #                               || $package     # debug
 380                                 );
 381                 Wprint '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
 382                 }
 383
 384         do { &{$_}() if $_; } for ($W->{"footing"});
 385
 386         Wprint "</body></html>\n";
 387         exit(0);
 388 }
 389
 390 sub header (%)
 391 {
 392 my(%pairs)=@_;
 393
 394         while (my($key,$val)=each(%pairs)) {
 395                 do { cluck "Headers already sent"; next; } if $W->{"heading_done"};
 396                 for ($W->{"headers_lc"}{lc $key} || ()) {
 397                         delete $W->{"headers"}{$_};
 398                         }
 399                 $W->{"headers_lc"}{lc $key}=$key;
 400                 $W->{"headers"}{$key}=$val;
 401                 }
 402 }
 403
 404 sub size_display ($)
 405 {
 406 my($size)=@_;
 407
 408            if ($size<4096)
 409                 {}
 410         elsif ($size<1024*1024)
 411                 { $size=sprintf "%.1fK",$size/1024; }
 412         else
 413                 { $size=sprintf "%.1fM",$size/1024/1024; }
 414         $size.="B";
 415         return $size;
 416 }
 417
 418 sub url_is_local ($)
 419 {
 420 my($url)=@_;
 421
 422         return $url!~m#^[a-z]+://#;
 423 }
 424
 425 sub url_out($%)
 426 {
 427 my($url,%args)=@_;
 428
 429         return $url if !url_is_local $url;
 430         $url=top_dir($url,%args) if $url=~m#^/# || $args{"abs"};
 431
 432         my $uri=URI->new($url);
 433         # Prefer the $uri values over "args_persistent" values.
 434         $uri->query_form_hash({
 435                         map({
 436                                 my $key=$_;
 437                                 my $val=$W->{"args"}{$key};
 438                                 (!defined $val ? () : ($key=>$val));
 439                                 } keys(%{$W->{"args_persistent"}})),
 440                         %{$uri->query_form_hash()},
 441                         });
 442         $url="".$uri;
 443
 444         return $url;
 445 }
 446
 447 sub a_href ($;$%)
 448 {
 449 my($url,$contents,%args)=@_;
 450
 451         do { $$_=1 if !defined $$_; } for (\$args{"size"});
 452         if (!defined $contents) {
 453                 $contents=$url;
 454                 $contents=File::Basename::basename($contents) if $args{"basename"};
 455                 $contents=CGI::escapeHTML($contents);
 456                 }
 457         $contents=~s#<a\b[^>]*>##gi;
 458         $contents=~s#</a>##gi;
 459
 460         $url=url_out($url,%args);
 461
 462         my $r='<a href="';
 463         my $urlent=CGI::escapeHTML($url);
 464            if ($url eq $urlent)
 465                 { $r.=$url; }
 466         elsif (url_is_local $url)
 467                 { $r.=$urlent; }
 468         elsif (defined $W->{"have_ent"} && !$W->{"have_ent"})   # non-ent client
 469                 { $r.=$url; }
 470         elsif ($W->{"have_ent"})        # ent client
 471                 { $r.=$urlent; }
 472         else    # unknown client, &CGI::escapeHTML should not be needed here
 473                 { $r.=CGI::escapeHTML(top_dir('/Redirect.pl?location='.uri_escape($url))); }
 474         $r.='"';
 475         do { $r.=" $_" if $_; } for ($args{"attr"});
 476         $r.='>'.$contents.'</a>';
 477         if ($args{"size"} && url_is_local($url) && ($args{"size"}>=2 || $url=~/[.](?:gz|Z|rpm|zip|deb|lha)/)) { # Downloadable?
 478                 $url=top_dir_disk().$url if $url=~m#^/#;
 479                 if (!-r $url)
 480                         { cluck "File not readable: $url"; }
 481                 else {
 482                         $r.='&nbsp;('.size_display((stat($url))[7]).')';
 483                         }
 484                 }
 485         return $r;
 486 }
 487
 488 sub input_hidden_persistents()
 489 {
 490         return join("",map({
 491                 my $key=$_;
 492                 my $val=$W->{"args"}{$key};
 493                 (!defined $val ? () : '<input type="hidden"'
 494                                 .' name="'.CGI::escapeHTML($key).'"'
 495                                 .' value="'.CGI::escapeHTML($val).'"'
 496                                 .' />'."\n");
 497                 } (keys(%{$W->{"args_persistent"}}))));
 498 }
 499
 500 sub http_moved($$;$)
 501 {
 502 my($self,$url,$status)=@_;
 503
 504         $url=url_out($url,"abs"=>1);
 505         $status||=Apache::HTTP_MOVED_TEMPORARILY;
 506         $W->{"r"}->status($status);
 507         $W->{"r"}->header_out("Location"=>$url);
 508         $W->{"header_only"}=1;
 509         My::Web->heading();
 510         exit;
 511         die "NOTREACHED";
 512 }
 513
 514 sub remote_ip ()
 515 {
 516         # Do not: PerlModule                 Apache::ForwardedFor
 517         #         PerlPostReadRequestHandler Apache::ForwardedFor
 518         # As 'Apache::ForwardedFor' takes the first of $ENV{"HTTP_X_FORWARDED_FOR"}
 519         # while the contents is '127.0.0.1, 213.220.195.171' if client has its own proxy.
 520         # We must take the last item ourselves.
 521         my $r=$W->{"r"}->headers_in()->{"X-Forwarded-For"} || $W->{"r"}->get_remote_host();
 522         $r=~s/^.*,\s*//;
 523         return $r;
 524 }
 525
 526 sub is_cz ()
 527 {
 528         return 0 if !$have_Geo_IP;
 529         return "CZ" eq Geo::IP->new()->country_code_by_addr(remote_ip());
 530 }
 531
 532 sub a_href_cz ($$;%)
 533 {
 534 my($url,$contents,%args)=@_;
 535
 536         return a_href $url,$contents,%args if is_cz();
 537         return $contents;
 538 }
 539
 540 sub make ($)
 541 {
 542 my($cmd)=@_;
 543
 544         system {'flock'} 'flock','-x',top_dir_disk(),$cmd.' >&2';
 545 }
 546
 547 sub img_size ($$)
 548 {
 549 my($width,$height)=@_;
 550
 551         return ($W->{"have_style"} ? "style=\"border:0;width:${width}px;height:${height}px\"" : "border=\"0\"")
 552                         ." width=\"$width\" height=\"$height\"";
 553 }
 554
 555 sub negotiate_variant (%)
 556 {
 557 my(%args)=@_;
 558
 559         my @fields=("id","qs","content-type","encoding","charset","lang","size");
 560         return [ map(($args{$_}),@fields) ];
 561 }
 562
 563 my @img_variants=(
 564                 { "id"=>"png","qs"=>1.0,"content-type"=>"image/png" },
 565                 { "id"=>"gif","qs"=>0.9,"content-type"=>"image/gif" },
 566                 );
 567 my $img_variants_re='[.](?:'.join('|',"jpeg",map(($_->{"id"}),@img_variants)).')$';
 568
 569 sub img_src ($)
 570 {
 571 my($file_base)=@_;
 572
 573         if (!url_is_local($file_base)) {
 574                 return $file_base if !wantarray();
 575                 return ($file_base,$file_base);
 576                 }
 577         # Known image extension?
 578         if ($file_base=~m#$img_variants_re#o) {
 579                 return $file_base if !wantarray();
 580                 return ($file_base,$file_base) if $file_base!~m#^/#;
 581                 return (top_dir($file_base),top_dir_disk().$file_base);
 582                 }
 583
 584         my $file_base_disk;
 585         my $file_base_uri;
 586         if ($file_base!~m#^/#) {
 587                 $file_base_disk=$file_base_uri=$file_base;
 588                 }
 589         else {
 590                 $file_base_disk=top_dir_disk().$file_base;
 591                 $file_base_uri=top_dir($file_base);
 592                 }
 593
 594         my @nego_variants;
 595         for my $var (@img_variants) {
 596                 my $file=$file_base_disk.".".$var->{"id"};
 597                 # TODO: Somehow quickly check dependencies?
 598                 make('make -s --no-print-directory'
 599                                                 .' -C '."'".File::Basename::dirname($file)."' '".File::Basename::basename($file)."'")
 600                                 if !-f $file;
 601                 push @nego_variants,negotiate_variant(
 602                                 %$var,
 603                                 "size"=>(stat $file)[7],
 604                                 );
 605                 }
 606         # Do not: ,$W->{"r"});
 607         # but should we provide somehow either 'HTTP::Headers' or 'HTTP::Request' ?
 608         my $ext=HTTP::Negotiate::choose(\@nego_variants);
 609         $ext||=$img_variants[0]->{"id"};        # &HTTP::Negotiate::choose failed?
 610
 611         return $file_base_uri.".".$ext if !wantarray();
 612         return ($file_base_uri.".".$ext,$file_base_disk.".".$ext);
 613 }
 614
 615 sub img ($$;%)
 616 {
 617 my($file_base,$alt,%attr)=@_;
 618
 619         my($file_uri,$file_disk)=img_src $file_base;
 620         my($width,$height)=Image::Size::imgsize($file_disk);
 621         $alt=~s/<[^>]*>//g;
 622         $alt=CGI::escapeHTML($alt);
 623         my $content="<img src=\"$file_uri\" alt=\"$alt\" title=\"$alt\" ".img_size($width,$height)
 624                         .(!$attr{"attr"} ? "" : " ".$attr{"attr"})." />";
 625         return a_href img_src($attr{"a_href_img"}),$content if $attr{"a_href_img"};
 626         return a_href $attr{"a_href"},$content if $attr{"a_href"};
 627         return $content;
 628 }
 629
 630 sub centerimg
 631 {
 632         my $r.="";
 633         $r.='<table border="0" width="100%"><tr>'."\n";
 634         @_=( [@_] ) if !ref $_[0];
 635         for (@_) {
 636                 $r.="\t".'<td align="center">'.&{\&img}(@$_).'</td>'."\n";
 637                 }
 638         $r.='</tr></table>'."\n";
 639         return $r;
 640 }
 641
 642 sub rightimg
 643 {
 644 my($text,@args_img)=@_;
 645
 646         # Workaround bug of 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)':
 647         return <<"HERE";
 648 <table border="0" width="100%">
 649         <col width="@{[ (!$W->{"browser"}->ie() ? "1*" : "90%" ) ]}" />
 650         <col width="@{[ (!$W->{"browser"}->ie() ? "0*" : "10%" ) ]}" />
 651         <tr>
 652                 <td align="left">
 653                         @{[ $text ]}
 654                 </td>
 655                 <td align="right">
 656                         @{[ &{\&img}(@args_img) ]}
 657                 </td>
 658         </tr>
 659 </table>
 660 HERE
 661 }
 662
 663 sub readfile ($$)
 664 {
 665 my($class,$filename)=@_;
 666
 667         local *F;
 668         open F,$filename or die "Cannot open \"$filename\": $!";
 669         local $/=undef();
 670         my $data=<F>;
 671         close F;
 672         return $data;
 673 }
 674
 675 sub arr_keys (@)
 676 {
 677 my(@arr)=@_;
 678
 679         my @r=();
 680         while (@arr) {
 681                 push @r,shift @arr;     # key
 682                 shift @arr;     # val
 683                 }
 684         return @r;
 685 }
 686
 687 sub no_cache($)
 688 {
 689 my($self)=@_;
 690
 691         header("Expires"=>"Mon, 26 Jul 1997 05:00:00 GMT");     # date in the past
 692         header("Last-Modified"=>strftime("%a, %d %b %Y %H:%M:%S GMT",gmtime()));        # always modified
 693         header("Cache-Control"=>"no-cache, must-revalidate");   # HTTP/1.1
 694         header("Pragma"=>"no-cache");   # HTTP/1.0
 695 }
 696
 697 sub heading ()
 698 {
 699 my($class)=@_;
 700
 701         # $ENV{"CLIENT_CHARSET"} ignored (mod_czech support dropped!)
 702         my $client_charset=$W->{"force_charset"} || "us-ascii";
 703         header("Content-Style-Type"=>"text/css");
 704         header("Content-Script-Type"=>"text/javascript");
 705         do { header("Content-Language"=>$_) if $_; } for $W->{"language"};
 706         $class->no_cache() if $W->{"no_cache"};
 707
 708         while (my($key,$val)=each(%{$W->{"headers"}})) {
 709                 $W->{"r"}->header_out($key,$val);
 710                 }
 711         if (!$W->{"header_only"}) {
 712                 $W->{"r"}->send_http_header("text/html; charset=$client_charset");      # "Content-type"; do not use header()
 713                 }
 714
 715         exit if $W->{"r"}->header_only();
 716         return if $W->{"header_only"};
 717         # We still can append headers before we put out some text.
 718         # FIXME: It is not clean to still append them without overwriting.
 719         return if $W->{"heading_done"}++;
 720
 721         if (1) { # || !$msie_major || $msie_major>=4) # TODO:dyn
 722                 Wprint '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n";
 723                 }
 724         Wprint '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
 725         Wprint '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="'
 726                         .($W->{"language"}||"en-US").'">'."\n";
 727         my $title=$W->{"title_prefix"}.join("",map({ ': '.$_; } ($W->{"title"} || ())));
 728         $title=~s#<[^>]*>##g;
 729         Wprint "<head>";
 730         Wprint "<title>$title</title>\n";
 731         if ($W->{"have_css"}) {
 732                 # Everything can get overriden later.
 733                 Wprint <<"HERE";
 734 <link rel="stylesheet" type="text/css" href="@{[ url_out("/My/Web.css") ]}" />
 735 HERE
 736                 }
 737         Wprint '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
 738         Wprint $W->{"head"};
 739         for my $type (qw(prev next index contents start up)) {
 740                 do { Wprint '<link rel="'.$type.'" href="'.$_.'" />'."\n" if $_; } for ($W->{"rel_$type"});
 741                 }
 742         Wprint "</head><body";
 743 #       Wprint ' bgcolor="black" text="white" link="aqua" vlink="teal"'
 744 #                       if $W->{"browser"}->netscape() && (!$W->{"browser"}->major() || $W->{"browser"}->major()<=4);
 745         Wprint $W->{"body_attr"};
 746         Wprint ">\n";
 747
 748         do { &{$_}() if $_; } for ($W->{"heading"});
 749 }
 750
 751 BEGIN {
 752         delete $W->{"__My::Web_init"};
 753         }
 754
 755 1;