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->{"head_css"}
  91                 # $W->{"force_charset"}
  92                 # $W->{"heading_done"}
  93                 # $W->{"footer_passed"}
  94                 # %{$W->{"headers"}}
  95                 # %{$W->{"headers_lc"}} # maps lc($headers_key)=>$headers_key
  96                 # @{$W->{"packages_used"}{$W->{"__PACKAGE__"}}}
  97                 # @{$W->{"packages_used"}{"__My::Web"}}
  98                 # %{$W->{"args"}}
  99
 100 sub init ($%)
 101 {
 102 my($class,%args)=@_;
 103
 104         print STDERR "$class->init ".Apache->request()->unparsed_uri()."\n";
 105
 106         my $packages_used_save=$W->{"packages_used"};
 107         $W={ %WebConfig,%args };        # override %WebConfig settings
 108         $W->{"packages_used"}=$packages_used_save;
 109
 110         # {"__PACKAGE__"} is mandatory for mod_perl-2.0;
 111         # $Apache::Registry::curstash is no longer supported.
 112         do { cluck "No $_" if !$W->{$_}; } for "__PACKAGE__";
 113
 114         $W->{"top_dir"}||=eval '$'.$W->{"__PACKAGE__"}.'::top_dir';
 115
 116         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_ent");
 117         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_js");
 118         do { $W->{$_}=1  if !defined $W->{$_}; } for ("have_css");      # AFAIK it does not hurt anyone.
 119         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer");
 120         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_delimit");
 121         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_mailme");
 122         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_ids");
 123         do { $W->{$_}=1  if !defined $W->{$_}; } for ("indexme");
 124         do { $W->{$_}="" if !defined $W->{$_}; } for ("head");
 125         do { $W->{$_}="" if !defined $W->{$_}; } for ("head_css");
 126         do { $W->{$_}="en-US" if !defined $W->{$_}; } for ("language");
 127
 128         my $footer_any=0;
 129         for (qw(footer_mailme footer_ids)) {
 130                 $W->{$_}=0 if !$W->{"footer"};
 131                 $footer_any=1 if $W->{$_};
 132                 }
 133         $W->{"footer"}=0 if !$footer_any;
 134         $W->{"footer_delimit"}=0 if !$W->{"footer"};
 135
 136         $W->{"r"}=Apache->request();
 137
 138         $W->{"QUERY_STRING"}=$W->{"r"}->args() || "";
 139         if ($W->{"detect_ent"}) {
 140                          if ($W->{"QUERY_STRING"}=~/[&]amp;have_ent/)
 141                         { $W->{"have_ent"}=0; }
 142                 elsif ($W->{"QUERY_STRING"}=~    /[&]have_ent/)
 143                         { $W->{"have_ent"}=1; }
 144                 else
 145                         { delete $W->{"have_ent"}; }
 146                 if (!defined $W->{"have_ent"} && $W->{"r"}->method() eq "GET") {
 147                         $W->{"head"}.='<meta http-equiv="Refresh" content="0; URL='
 148                                         .CGI::escapeHTML("http://".&{$W->{"web_hostname_sub"}}()."/".($W->{"r"}->uri()=~m#^/*(.*)$#)[0]
 149                                                         ."?".($W->{"QUERY_STRING"} || "detect_ent_glue=1").'&have_ent=detect')
 150                                         .'" />'."\n";
 151                         }
 152                 }
 153         $W->{"QUERY_STRING"}=~s/([&])amp;/$1/g;
 154         $W->{"r"}->args($W->{"QUERY_STRING"});
 155         # Workaround: &CGI::Vars behaves weird if strings passed both as POST data and in: $QUERY_STRING
 156         do { $W->{"r"}->args(""); delete $ENV{"QUERY_STRING"}; } if $W->{"r"}->method() eq "POST";
 157         # Do not: $W->{"r"}->args()
 158         # as it parses only QUERY_STRING (not POST data).
 159         $W->{"args"}={ CGI->new($W->{"r"})->Vars() };
 160         for my $name (keys(%{$W->{"args"}})) {
 161                 my @vals=split /\x00/,$W->{"args"}{$name};
 162                 next if @vals<=1;
 163                 $W->{"args"}{$name}=[@vals];
 164                 }
 165
 166         do { $W->{$_}=$W->{"r"}->headers_in()->{"Accept"}     if !defined $W->{$_}; } for ("accept");
 167         do { $W->{$_}=$W->{"r"}->headers_in()->{"User-Agent"} if !defined $W->{$_}; } for ("user_agent");
 168
 169         $W->{"browser"}=HTTP::BrowserDetect->new($W->{"user_agent"});
 170
 171         if (!defined $W->{"have_style"}) {
 172                 $W->{"have_style"}=(!$W->{"browser"}->netscape() || ($W->{"browser"}->major() && $W->{"browser"}->major()>4) ? 1 : 0);
 173                 }
 174
 175         $W->{"have_js"}=($W->{"args"}{"have_js"} ? 1 : 0);
 176         if ($W->{"detect_js"} && !$W->{"have_js"}) {
 177                 $W->{"head"}.='<script type="text/javascript" src="'.top_dir('/have_js.js.pl').'"></script>'."\n";
 178                 }
 179
 180         do { args_check(%$_) if $_; } for ($W->{"args_check"});
 181
 182         $ENV{"HOSTNAME"}||=&{$W->{"web_hostname_sub"}}();
 183
 184         return bless $W,$class;
 185 }
 186
 187 sub Wprint($)
 188 {
 189 my($text)=@_;
 190
 191         $W->{"r"}->puts($text);
 192 }
 193
 194 # local *FH;
 195 # tie *FH,ref($W),$W;
 196 sub TIEHANDLE($)
 197 {
 198 my($class,$W)=@_;
 199
 200         my $self={};
 201         $self->{"W"}=$W or confess "Missing W";
 202         return bless $self,$class;
 203 }
 204
 205 sub WRITE
 206 {
 207 my($self,$scalar,$length,$offset)=@_;
 208
 209         Wprint substr($scalar,0,$length);
 210 }
 211
 212 sub top_dir_disk ()
 213 {
 214         do { return $_ if $_; } for ($W->{"top_dir"});
 215         return $INC[0]; # fallback
 216 }
 217
 218 # $args{"abs"}
 219 sub top_dir (;$%)
 220 {
 221 my($in,%args)=@_;
 222
 223         if (my $uri=$W->{"r"}->unparsed_uri()) {
 224                 if ($W->{"args"}{"Wabs"} || $args{"abs"}) {
 225                         # FIXME: $in may not be defined here!
 226                         # to prevent: Use of uninitialized value in ...
 227                         if ($in=~m#^/#) {
 228                                 $in=~s#^/*##;
 229                                 }
 230                         else {
 231                                 $in=$uri."/".$in;
 232                                 $in=~tr#/#/#s;
 233                                 1 while $in=~s#/(?:[^/]+)/\Q..\E/#/#g
 234                                 }
 235                         return "http://".&{$W->{"web_hostname_sub"}}()."/".(defined $in ? $in : "");
 236                         }
 237                 $uri.="Index" if $uri=~m#/$#;
 238                 if (defined $in) {
 239                         my($inpath,$inquery)=split /[?]/,$in,2;
 240                         $inpath=~tr///cs;
 241                         $uri=~tr///cs;
 242                         for (;;) {
 243                                 my($in1 ,$in2 )=($in =~m#^(/[^/]+)(/.*)$#);
 244                                 my($uri1,$uri2)=($uri=~m#^(/[^/]+)(/.*)$#);
 245                                 last if !defined $in1 || !defined $uri1 || $in1 ne $uri1;
 246                                 $in=$in2;
 247                                 $uri=$uri2;
 248                                 }
 249                         }
 250                 $uri=~s#^/*##;
 251                 $uri=~s#[^/]+#..#g;
 252                 $uri=File::Basename::dirname($uri);
 253                 my $r=$uri.(defined $in ? $in : "");
 254 #               1 while $r=~s#^[.]/##;
 255 #               $r="./$r" if $r=~m#^(?:?.*)$#;  # empty pathname?
 256                 return $r;
 257                 }
 258         return top_dir_disk().$in;
 259 }
 260
 261 sub fatal (;$);
 262
 263 sub args_check (%)
 264 {
 265 my(%tmpl)=@_;
 266
 267         while (my($name,$regex)=each(%tmpl)) {
 268                 my $name_html="Parameter <span class=\"quote\">".CGI::escapeHTML($name)."</span>";
 269                 $W->{"args"}{$name}="" if !defined $W->{"args"}{$name};
 270                 $W->{"args"}{$name}=[ $W->{"args"}{$name} ] if !ref $W->{"args"}{$name} && ref $regex;
 271                 fatal "$name_html passed as multivar although singlevar expected"
 272                                 if ref $W->{"args"}{$name} && !ref $regex;
 273                 $regex=$regex->[0] if ref $regex;
 274                 for my $val (!ref $W->{"args"}{$name} ? $W->{"args"}{$name} : @{$W->{"args"}{$name}}) {
 275                         $val="" if !defined $val;
 276                         fatal "$name_html <span class=\"quote\">".CGI::escapeHTML($val)."</span>"
 277                                                         ." does not match the required regex <span class=\"quote\">".CGI::escapeHTML($regex)."</span> "
 278                                         if $regex ne "" && $val!~/$regex/;
 279                         }
 280                 }
 281 }
 282
 283 sub vskip (;$)
 284 {
 285 my($height)=@_;
 286
 287         return '<p'.(!defined $height ? "" : ' style="height: '.$height.';"').'>&nbsp;</p>'."\n";
 288 }
 289
 290 sub fatal (;$)
 291 {
 292 my($msg)=@_;
 293
 294         $msg="UNKNOWN" if !$msg;
 295         cluck "FATAL: $msg";
 296
 297         $W->{"indexme"}=0;      # For the case no heading was sent yet.
 298         $W->{"heading_done"}=0; # for the case of already sent {"header_only"}==1
 299         $W->{"header_only"}=0;  # assurance for &heading
 300         My::Web->heading();
 301         Wprint "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
 302                         ."<p>You can report this problem's details to"
 303                         ." ".a_href("mailto:".$W->{"admin_mail"},"admin of this website").".</p>\n";
 304         footer();
 305 }
 306
 307 sub footer (;$)
 308 {
 309         exit 1 if $W->{"footer_passed"}++;      # deadlock prevention:
 310
 311         Wprint vskip if $W->{"footer_delimit"};
 312
 313         do { &{$_}() if $_; } for ($W->{"footing_delimit"});
 314
 315         Wprint "<hr />\n" if $W->{"footer"};
 316
 317         if ($W->{"footer_mailme"}) {
 318                 Wprint '<form action="'.top_dir('/SendMsg.pl').'" method="post" onsubmit="'
 319                                 ."this.elements['msgscript'].value=this.elements['msghtml'].value;"
 320                                 ."this.elements['msghtml'].value='';"
 321                                 ."this.submit();"
 322                                 .'">'."\n";
 323                         Wprint input_hidden_persistents()."\n";
 324                         Wprint '<p align="right">'."\n";
 325                                 Wprint '<input name="msgscript" type="hidden" />'."\n";
 326                                 Wprint '<input name="msghtml" type="text" size="32" alt="Message" />'."\n";
 327                                 Wprint '<input name="submit" type="submit" value="Quick Note" />'."\n";
 328                         Wprint '</p>'."\n";
 329                 Wprint '</form>'."\n";
 330                 }
 331
 332         my @packages_used=(
 333                         $W->{"__PACKAGE__"},
 334                         __PACKAGE__,
 335                         @{$W->{"packages_used"}{"__My::Web"}},
 336                         map((!$_ ? () : @$_),$W->{"packages_used"}{$W->{"__PACKAGE__"}}),
 337                         );
 338         my %packages_used;
 339         @packages_used=grep((!$packages_used{$_}++),@packages_used);
 340         if ($W->{"footer_ids"}) {
 341                 Wprint '<p class="cvs-id">';
 342                 Wprint join("<br />\n",map({ my $package=$_;
 343                         my $cvs_id=(eval('$'.$package."::CVS_ID")
 344 #                                       || $package     # debug
 345                                         );
 346                         if (!$cvs_id) {
 347                                 ();
 348                                 }
 349                         else {
 350                                 $cvs_id='$'.$cvs_id.'$';        # Eaten by 'q' operator.
 351                                 my @cvs_id_split=split / +/,$cvs_id;
 352                                 if (@cvs_id_split==8) {
 353                                         my $file=$package;
 354                                         $file=~s#::#/#g;
 355                                         my $ext;
 356                                         my @tried;
 357                                         for (qw(.html.pl .pl .pm),"") {
 358                                                 $ext=$_;
 359                                                 my $pathname=top_dir_disk()."/$file$ext";
 360                                                 push @tried,$pathname;
 361                                                 last if -r $pathname;
 362                                                 cluck "Class file $file not found; tried: ".join(" ",@tried) if !$ext;
 363                                                 }
 364                                         $file.=$ext;
 365                                         $cvs_id_split[2]=""
 366                                                         .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $W->{"viewcvs"}))[0]."$file?rev=".$cvs_id_split[2],
 367                                                                         $cvs_id_split[2]);
 368                                         $cvs_id_split[1]=a_href($W->{"viewcvs"}.$file,
 369                                                         ($package!~/^Apache::/ ? $package : $cvs_id_split[1]));
 370                                         $cvs_id_split[5]=&{$W->{"cvs_id_author"}}($cvs_id_split[5]);
 371                                         }
 372                                 join " ",@cvs_id_split;
 373                                 }
 374                         } @packages_used));
 375                 Wprint "</p>\n";
 376                 }
 377
 378         for my $package (@packages_used) {
 379                 my $cvs_id=(eval('$'.$package."::CVS_ID")
 380 #                               || $package     # debug
 381                                 );
 382                 Wprint '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
 383                 }
 384
 385         do { &{$_}() if $_; } for ($W->{"footing"});
 386
 387         Wprint "</body></html>\n";
 388         exit(0);
 389 }
 390
 391 sub header (%)
 392 {
 393 my(%pairs)=@_;
 394
 395         while (my($key,$val)=each(%pairs)) {
 396                 do { cluck "Headers already sent"; next; } if $W->{"heading_done"};
 397                 for ($W->{"headers_lc"}{lc $key} || ()) {
 398                         delete $W->{"headers"}{$_};
 399                         }
 400                 $W->{"headers_lc"}{lc $key}=$key;
 401                 $W->{"headers"}{$key}=$val;
 402                 }
 403 }
 404
 405 sub size_display ($)
 406 {
 407 my($size)=@_;
 408
 409            if ($size<4096)
 410                 {}
 411         elsif ($size<1024*1024)
 412                 { $size=sprintf "%.1fK",$size/1024; }
 413         else
 414                 { $size=sprintf "%.1fM",$size/1024/1024; }
 415         $size.="B";
 416         return $size;
 417 }
 418
 419 sub url_is_local ($)
 420 {
 421 my($url)=@_;
 422
 423         return $url!~m#^[a-z]+://#;
 424 }
 425
 426 sub url_out($%)
 427 {
 428 my($url,%args)=@_;
 429
 430         return $url if !url_is_local $url;
 431         $url=top_dir($url,%args) if $url=~m#^/# || $args{"abs"};
 432
 433         my $uri=URI->new($url);
 434         for my $key (keys(%{$W->{"args_persistent"}})) {
 435                 my $val=$W->{"args"}{$key};
 436                 next if !defined $val;
 437                 $uri->query_param_append($key=>$val);
 438                 }
 439         $url="".$uri;
 440
 441         return $url;
 442 }
 443
 444 sub a_href ($;$%)
 445 {
 446 my($url,$contents,%args)=@_;
 447
 448         do { $$_=1 if !defined $$_; } for (\$args{"size"});
 449         if (!defined $contents) {
 450                 $contents=$url;
 451                 $contents=File::Basename::basename($contents) if $args{"basename"};
 452                 $contents=CGI::escapeHTML($contents);
 453                 }
 454         $contents=~s#<a\b[^>]*>##gi;
 455         $contents=~s#</a>##gi;
 456
 457         $url=url_out($url,%args);
 458
 459         my $r='<a href="';
 460         my $urlent=CGI::escapeHTML($url);
 461            if ($url eq $urlent)
 462                 { $r.=$url; }
 463         elsif (url_is_local $url)
 464                 { $r.=$urlent; }
 465         elsif (defined $W->{"have_ent"} && !$W->{"have_ent"})   # non-ent client
 466                 { $r.=$url; }
 467         elsif ($W->{"have_ent"})        # ent client
 468                 { $r.=$urlent; }
 469         else    # unknown client, &CGI::escapeHTML should not be needed here
 470                 { $r.=CGI::escapeHTML(top_dir('/Redirect.pl?location='.uri_escape($url))); }
 471         $r.='"';
 472         do { $r.=" $_" if $_; } for ($args{"attr"});
 473         $r.='>'.$contents.'</a>';
 474         if ($args{"size"} && url_is_local($url) && ($args{"size"}>=2 || $url=~/[.](?:gz|Z|rpm|zip|deb|lha)/)) { # Downloadable?
 475                 $url=top_dir_disk().$url if $url=~m#^/#;
 476                 if (!-r $url)
 477                         { cluck "File not readable: $url"; }
 478                 else {
 479                         $r.='&nbsp;('.size_display((stat($url))[7]).')';
 480                         }
 481                 }
 482         return $r;
 483 }
 484
 485 sub input_hidden_persistents()
 486 {
 487         return join("",map({
 488                 my $key=$_;
 489                 my $val=$W->{"args"}{$key};
 490                 (!defined $val ? () : '<input type="hidden"'
 491                                 .' name="'.CGI::escapeHTML($key).'"'
 492                                 .' value="'.CGI::escapeHTML($val).'"'
 493                                 .' />'."\n");
 494                 } (keys(%{$W->{"args_persistent"}}))));
 495 }
 496
 497 sub http_moved($$;$)
 498 {
 499 my($self,$url,$status)=@_;
 500
 501         $url=url_out($url,"abs"=>1);
 502         $status||=Apache::HTTP_MOVED_TEMPORARILY;
 503         $W->{"r"}->status($status);
 504         $W->{"r"}->header_out("Location"=>$url);
 505         $W->{"header_only"}=1;
 506         My::Web->heading();
 507         exit;
 508         die "NOTREACHED";
 509 }
 510
 511 sub remote_ip ()
 512 {
 513         # Do not: PerlModule                 Apache::ForwardedFor
 514         #         PerlPostReadRequestHandler Apache::ForwardedFor
 515         # As 'Apache::ForwardedFor' takes the first of $ENV{"HTTP_X_FORWARDED_FOR"}
 516         # while the contents is '127.0.0.1, 213.220.195.171' if client has its own proxy.
 517         # We must take the last item ourselves.
 518         my $r=$W->{"r"}->headers_in()->{"X-Forwarded-For"} || $W->{"r"}->get_remote_host();
 519         $r=~s/^.*,\s*//;
 520         return $r;
 521 }
 522
 523 sub is_cz ()
 524 {
 525         return 0 if !$have_Geo_IP;
 526         return "CZ" eq Geo::IP->new()->country_code_by_addr(remote_ip());
 527 }
 528
 529 sub a_href_cz ($$;%)
 530 {
 531 my($url,$contents,%args)=@_;
 532
 533         return a_href $url,$contents,%args if is_cz();
 534         return $contents;
 535 }
 536
 537 sub make ($)
 538 {
 539 my($cmd)=@_;
 540
 541         system {'flock'} 'flock','-x',top_dir_disk(),$cmd.' >&2';
 542 }
 543
 544 sub img_size ($$)
 545 {
 546 my($width,$height)=@_;
 547
 548         return ($W->{"have_style"} ? "style=\"border:0;width:${width}px;height:${height}px\"" : "border=\"0\"")
 549                         ." width=\"$width\" height=\"$height\"";
 550 }
 551
 552 sub negotiate_variant (%)
 553 {
 554 my(%args)=@_;
 555
 556         my @fields=("id","qs","content-type","encoding","charset","lang","size");
 557         return [ map(($args{$_}),@fields) ];
 558 }
 559
 560 my @img_variants=(
 561                 { "id"=>"png","qs"=>1.0,"content-type"=>"image/png" },
 562                 { "id"=>"gif","qs"=>0.9,"content-type"=>"image/gif" },
 563                 );
 564 my $img_variants_re='[.](?:'.join('|',"jpeg",map(($_->{"id"}),@img_variants)).')$';
 565
 566 sub img_src ($)
 567 {
 568 my($file_base)=@_;
 569
 570         if (!url_is_local($file_base)) {
 571                 return $file_base if !wantarray();
 572                 return ($file_base,$file_base);
 573                 }
 574         # Known image extension?
 575         if ($file_base=~m#$img_variants_re#o) {
 576                 return $file_base if !wantarray();
 577                 return ($file_base,$file_base) if $file_base!~m#^/#;
 578                 return (top_dir($file_base),top_dir_disk().$file_base);
 579                 }
 580
 581         my $file_base_disk;
 582         my $file_base_uri;
 583         if ($file_base!~m#^/#) {
 584                 $file_base_disk=$file_base_uri=$file_base;
 585                 }
 586         else {
 587                 $file_base_disk=top_dir_disk().$file_base;
 588                 $file_base_uri=top_dir($file_base);
 589                 }
 590
 591         my @nego_variants;
 592         for my $var (@img_variants) {
 593                 my $file=$file_base_disk.".".$var->{"id"};
 594                 # TODO: Somehow quickly check dependencies?
 595                 make('make -s --no-print-directory'
 596                                                 .' -C '."'".File::Basename::dirname($file)."' '".File::Basename::basename($file)."'")
 597                                 if !-f $file;
 598                 push @nego_variants,negotiate_variant(
 599                                 %$var,
 600                                 "size"=>(stat $file)[7],
 601                                 );
 602                 }
 603         # Do not: ,$W->{"r"});
 604         # but should we provide somehow either 'HTTP::Headers' or 'HTTP::Request' ?
 605         my $ext=HTTP::Negotiate::choose(\@nego_variants);
 606         $ext||=$img_variants[0]->{"id"};        # &HTTP::Negotiate::choose failed?
 607
 608         return $file_base_uri.".".$ext if !wantarray();
 609         return ($file_base_uri.".".$ext,$file_base_disk.".".$ext);
 610 }
 611
 612 sub img ($$;%)
 613 {
 614 my($file_base,$alt,%attr)=@_;
 615
 616         my($file_uri,$file_disk)=img_src $file_base;
 617         my($width,$height)=Image::Size::imgsize($file_disk);
 618         $alt=~s/<[^>]*>//g;
 619         $alt=CGI::escapeHTML($alt);
 620         my $content="<img src=\"$file_uri\" alt=\"$alt\" title=\"$alt\" ".img_size($width,$height)
 621                         .(!$attr{"attr"} ? "" : " ".$attr{"attr"})." />";
 622         return a_href img_src($attr{"a_href_img"}),$content if $attr{"a_href_img"};
 623         return a_href $attr{"a_href"},$content if $attr{"a_href"};
 624         return $content;
 625 }
 626
 627 sub centerimg
 628 {
 629         my $r.="";
 630         $r.='<table border="0" width="100%"><tr>'."\n";
 631         @_=( [@_] ) if !ref $_[0];
 632         for (@_) {
 633                 $r.="\t".'<td align="center">'.&{\&img}(@$_).'</td>'."\n";
 634                 }
 635         $r.='</tr></table>'."\n";
 636         return $r;
 637 }
 638
 639 sub rightimg
 640 {
 641 my($text,@args_img)=@_;
 642
 643         # Workaround bug of 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)':
 644         return <<"HERE";
 645 <table border="0" width="100%">
 646         <col width="@{[ (!$W->{"browser"}->ie() ? "1*" : "90%" ) ]}" />
 647         <col width="@{[ (!$W->{"browser"}->ie() ? "0*" : "10%" ) ]}" />
 648         <tr>
 649                 <td align="left">
 650                         @{[ $text ]}
 651                 </td>
 652                 <td align="right">
 653                         @{[ &{\&img}(@args_img) ]}
 654                 </td>
 655         </tr>
 656 </table>
 657 HERE
 658 }
 659
 660 sub readfile ($$)
 661 {
 662 my($class,$filename)=@_;
 663
 664         local *F;
 665         open F,$filename or die "Cannot open \"$filename\": $!";
 666         local $/=undef();
 667         my $data=<F>;
 668         close F;
 669         return $data;
 670 }
 671
 672 sub arr_keys (@)
 673 {
 674 my(@arr)=@_;
 675
 676         my @r=();
 677         while (@arr) {
 678                 push @r,shift @arr;     # key
 679                 shift @arr;     # val
 680                 }
 681         return @r;
 682 }
 683
 684 sub no_cache($)
 685 {
 686 my($self)=@_;
 687
 688         header("Expires"=>"Mon, 26 Jul 1997 05:00:00 GMT");     # date in the past
 689         header("Last-Modified"=>strftime("%a, %d %b %Y %H:%M:%S GMT",gmtime()));        # always modified
 690         header("Cache-Control"=>"no-cache, must-revalidate");   # HTTP/1.1
 691         header("Pragma"=>"no-cache");   # HTTP/1.0
 692 }
 693
 694 sub heading ()
 695 {
 696 my($class)=@_;
 697
 698         # $ENV{"CLIENT_CHARSET"} ignored (mod_czech support dropped!)
 699         my $client_charset=$W->{"force_charset"} || "us-ascii";
 700         header("Content-Style-Type"=>"text/css");
 701         header("Content-Script-Type"=>"text/javascript");
 702         do { header("Content-Language"=>$_) if $_; } for $W->{"language"};
 703         $class->no_cache() if $W->{"no_cache"};
 704
 705         while (my($key,$val)=each(%{$W->{"headers"}})) {
 706                 $W->{"r"}->header_out($key,$val);
 707                 }
 708         if (!$W->{"header_only"}) {
 709                 $W->{"r"}->send_http_header("text/html; charset=$client_charset");      # "Content-type"; do not use header()
 710                 }
 711
 712         exit if $W->{"r"}->header_only();
 713         return if $W->{"header_only"};
 714         # We still can append headers before we put out some text.
 715         # FIXME: It is not clean to still append them without overwriting.
 716         return if $W->{"heading_done"}++;
 717
 718         if (1) { # || !$msie_major || $msie_major>=4) # TODO:dyn
 719                 Wprint '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n";
 720                 }
 721         Wprint '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
 722         Wprint '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="'
 723                         .($W->{"language"}||"en-US").'">'."\n";
 724         my $title=$W->{"title_prefix"}.join("",map({ ': '.$_; } ($W->{"title"} || ())));
 725         $title=~s#<[^>]*>##g;
 726         Wprint "<head>";
 727         Wprint "<title>$title</title>\n";
 728
 729         if ($W->{"have_css"}) {
 730                 Wprint <<'HERE';
 731 <style type="text/css"><!--
 732 .cvs-id   { font-family: monospace; }
 733 .error    { color: red;   background-color: transparent; }
 734 .quote    { font-family: monospace; }
 735 .nowrap   { white-space: nowrap; }
 736 .centered { text-align: center; }
 737 .tab-bold { font-weight: bold; }
 738 .tab-head { font-weight: bold; }
 739 /*
 740 .tab-head { font-weight: bold; color: yellow; background-color: transparent; }
 741 body {
 742                 background-color: black;
 743                 color: white;
 744                 }
 745 :link    { color: aqua;   background-color: transparent; }
 746 :visited { color: teal;   background-color: transparent; }
 747 h1,h2    { color: yellow; background-color: transparent; }
 748 */
 749 td       { padding: 2px; }
 750 caption  { caption-side: bottom; }
 751 .footer img { vertical-align: middle; }
 752 HERE
 753                 Wprint $W->{"head_css"}."\n";
 754                 Wprint "--></style>\n";
 755                 }
 756
 757         Wprint '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
 758         Wprint $W->{"head"};
 759         for my $type (qw(prev next index contents start up)) {
 760                 do { Wprint '<link rel="'.$type.'" href="'.$_.'" />'."\n" if $_; } for ($W->{"rel_$type"});
 761                 }
 762         Wprint "</head><body";
 763 #       Wprint ' bgcolor="black" text="white" link="aqua" vlink="teal"'
 764 #                       if $W->{"browser"}->netscape() && (!$W->{"browser"}->major() || $W->{"browser"}->major()<=4);
 765         do { &{$_}($W) if $_; } for $W->{"body_attr_sub"};
 766         Wprint ">\n";
 767
 768         do { &{$_}() if $_; } for ($W->{"heading"});
 769 }
 770
 771 BEGIN {
 772         delete $W->{"__My::Web_init"};
 773         }
 774
 775 1;