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 # Do not: use ModPerl::Util qw(exit);
  80 # to prevent in mod_perl2: "exit" is not exported by the ModPerl::Util module
  81 # I do not know why.
  82 use POSIX qw(strftime);
  83 use Tie::Handle;
  84 use Apache2::Const qw(HTTP_MOVED_TEMPORARILY);
  85 use URI;
  86 use URI::QueryParam;
  87
  88
  89 #our $W;
  90                 # $W->{"title"}
  91                 # $W->{"head"}
  92                 # $W->{"force_charset"}
  93                 # $W->{"heading_done"}
  94                 # $W->{"footer_passed"}
  95                 # %{$W->{"headers"}}
  96                 # %{$W->{"headers_lc"}} # maps lc($headers_key)=>$headers_key
  97                 # @{$W->{"packages_used"}{$W->{"__PACKAGE__"}}}
  98                 # @{$W->{"packages_used"}{"__My::Web"}}
  99                 # %{$W->{"args"}}
 100
 101 sub init ($%)
 102 {
 103 my($class,%args)=@_;
 104
 105         print STDERR "$class->init ".Apache2::RequestUtil->request()->unparsed_uri()."\n";
 106
 107         my $packages_used_save=$W->{"packages_used"};
 108         $W={ %WebConfig,%args };        # override %WebConfig settings
 109         $W->{"packages_used"}=$packages_used_save;
 110
 111         # {"__PACKAGE__"} is mandatory for mod_perl-2.0;
 112         # $Apache2::Registry::curstash is no longer supported.
 113         do { cluck "No $_" if !$W->{$_}; } for "__PACKAGE__";
 114
 115         $W->{"top_dir"}||=eval '$'.$W->{"__PACKAGE__"}.'::top_dir';
 116
 117         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_ent");
 118         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_js");
 119         do { $W->{$_}=1  if !defined $W->{$_}; } for ("have_css");      # AFAIK it does not hurt anyone.
 120         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer");
 121         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_delimit");
 122         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_mailme");
 123         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_ids");
 124         do { $W->{$_}=1  if !defined $W->{$_}; } for ("indexme");
 125         do { $W->{$_}="" if !defined $W->{$_}; } for ("head");
 126         do { $W->{$_}="" if !defined $W->{$_}; } for ("body_attr");
 127         do { $W->{$_}="en-US" if !defined $W->{$_}; } for ("language");
 128
 129         my $footer_any=0;
 130         for (qw(footer_mailme footer_ids)) {
 131                 $W->{$_}=0 if !$W->{"footer"};
 132                 $footer_any=1 if $W->{$_};
 133                 }
 134         $W->{"footer"}=0 if !$footer_any;
 135         $W->{"footer_delimit"}=0 if !$W->{"footer"};
 136
 137         $W->{"r"}=Apache2::RequestUtil->request();
 138
 139         $W->{"QUERY_STRING"}=$W->{"r"}->args() || "";
 140         if ($W->{"detect_ent"}) {
 141                          if ($W->{"QUERY_STRING"}=~/[&]amp;have_ent/)
 142                         { $W->{"have_ent"}=0; }
 143                 elsif ($W->{"QUERY_STRING"}=~    /[&]have_ent/)
 144                         { $W->{"have_ent"}=1; }
 145                 else
 146                         { delete $W->{"have_ent"}; }
 147                 if (!defined $W->{"have_ent"} && $W->{"r"}->method() eq "GET") {
 148                         $W->{"head"}.='<meta http-equiv="Refresh" content="0; URL='
 149                                         .CGI::escapeHTML("http://".&{$W->{"web_hostname_sub"}}()."/".($W->{"r"}->uri()=~m#^/*(.*)$#)[0]
 150                                                         ."?".($W->{"QUERY_STRING"} || "detect_ent_glue=1").'&have_ent=detect')
 151                                         .'" />'."\n";
 152                         }
 153                 }
 154         $W->{"QUERY_STRING"}=~s/([&])amp;/$1/g;
 155         $W->{"r"}->args($W->{"QUERY_STRING"});
 156         # Workaround: &CGI::Vars behaves weird if strings passed both as POST data and in: $QUERY_STRING
 157         do { $W->{"r"}->args(""); delete $ENV{"QUERY_STRING"}; } if $W->{"r"}->method() eq "POST";
 158         # Do not: $W->{"r"}->args()
 159         # as it parses only QUERY_STRING (not POST data).
 160         $W->{"args"}={ CGI->new($W->{"r"})->Vars() };
 161         for my $name (keys(%{$W->{"args"}})) {
 162                 my @vals=split /\x00/,$W->{"args"}{$name};
 163                 next if @vals<=1;
 164                 $W->{"args"}{$name}=[@vals];
 165                 }
 166
 167         do { $W->{$_}=$W->{"r"}->headers_in()->{"Accept"}     if !defined $W->{$_}; } for ("accept");
 168         do { $W->{$_}=$W->{"r"}->headers_in()->{"User-Agent"} if !defined $W->{$_}; } for ("user_agent");
 169
 170         $W->{"browser"}=HTTP::BrowserDetect->new($W->{"user_agent"});
 171
 172         if (!defined $W->{"have_style"}) {
 173                 $W->{"have_style"}=(!$W->{"browser"}->netscape() || ($W->{"browser"}->major() && $W->{"browser"}->major()>4) ? 1 : 0);
 174                 }
 175
 176         $W->{"have_js"}=($W->{"args"}{"have_js"} ? 1 : 0);
 177         if ($W->{"detect_js"} && !$W->{"have_js"}) {
 178                 $W->{"head"}.='<script type="text/javascript" src="'.top_dir('/have_js.js.pl').'"></script>'."\n";
 179                 }
 180
 181         do { args_check(%$_) if $_; } for ($W->{"args_check"});
 182
 183         $ENV{"HOSTNAME"}||=&{$W->{"web_hostname_sub"}}();
 184
 185         return bless $W,$class;
 186 }
 187
 188 sub Wprint($)
 189 {
 190 my($text)=@_;
 191
 192         $W->{"r"}->puts($text);
 193 }
 194
 195 # local *FH;
 196 # tie *FH,ref($W),$W;
 197 sub TIEHANDLE($)
 198 {
 199 my($class,$W)=@_;
 200
 201         my $self={};
 202         $self->{"W"}=$W or confess "Missing W";
 203         return bless $self,$class;
 204 }
 205
 206 sub WRITE
 207 {
 208 my($self,$scalar,$length,$offset)=@_;
 209
 210         Wprint substr($scalar,0,$length);
 211 }
 212
 213 sub top_dir_disk ()
 214 {
 215         do { return $_ if $_; } for ($W->{"top_dir"});
 216         return $INC[0]; # fallback
 217 }
 218
 219 # $args{"abs"}
 220 sub top_dir (;$%)
 221 {
 222 my($in,%args)=@_;
 223
 224         if (my $uri=$W->{"r"}->unparsed_uri()) {
 225                 if ($W->{"args"}{"Wabs"} || $args{"abs"}) {
 226                         # FIXME: $in may not be defined here!
 227                         # to prevent: Use of uninitialized value in ...
 228                         if ($in=~m#^/#) {
 229                                 $in=~s#^/*##;
 230                                 }
 231                         else {
 232                                 $in=$uri."/".$in;
 233                                 $in=~tr#/#/#s;
 234                                 1 while $in=~s#/(?:[^/]+)/\Q..\E/#/#g
 235                                 }
 236                         return "http://".&{$W->{"web_hostname_sub"}}()."/".(defined $in ? $in : "");
 237                         }
 238                 $uri.="Index" if $uri=~m#/$#;
 239                 if (defined $in) {
 240                         my($inpath,$inquery)=split /[?]/,$in,2;
 241                         $inpath=~tr///cs;
 242                         $uri=~tr///cs;
 243                         for (;;) {
 244                                 my($in1 ,$in2 )=($in =~m#^(/[^/]+)(/.*)$#);
 245                                 my($uri1,$uri2)=($uri=~m#^(/[^/]+)(/.*)$#);
 246                                 last if !defined $in1 || !defined $uri1 || $in1 ne $uri1;
 247                                 $in=$in2;
 248                                 $uri=$uri2;
 249                                 }
 250                         }
 251                 $uri=~s#^/*##;
 252                 $uri=~s#[^/]+#..#g;
 253                 $uri=File::Basename::dirname($uri);
 254                 my $r=$uri.(defined $in ? $in : "");
 255 #               1 while $r=~s#^[.]/##;
 256 #               $r="./$r" if $r=~m#^(?:?.*)$#;  # empty pathname?
 257                 return $r;
 258                 }
 259         return top_dir_disk().$in;
 260 }
 261
 262 sub fatal (;$);
 263
 264 sub args_check (%)
 265 {
 266 my(%tmpl)=@_;
 267
 268         while (my($name,$regex)=each(%tmpl)) {
 269                 my $name_html="Parameter <span class=\"quote\">".CGI::escapeHTML($name)."</span>";
 270                 $W->{"args"}{$name}="" if !defined $W->{"args"}{$name};
 271                 $W->{"args"}{$name}=[ $W->{"args"}{$name} ] if !ref $W->{"args"}{$name} && ref $regex;
 272                 fatal "$name_html passed as multivar although singlevar expected"
 273                                 if ref $W->{"args"}{$name} && !ref $regex;
 274                 $regex=$regex->[0] if ref $regex;
 275                 for my $val (!ref $W->{"args"}{$name} ? $W->{"args"}{$name} : @{$W->{"args"}{$name}}) {
 276                         $val="" if !defined $val;
 277                         fatal "$name_html <span class=\"quote\">".CGI::escapeHTML($val)."</span>"
 278                                                         ." does not match the required regex <span class=\"quote\">".CGI::escapeHTML($regex)."</span> "
 279                                         if $regex ne "" && $val!~/$regex/;
 280                         }
 281                 }
 282 }
 283
 284 sub vskip (;$)
 285 {
 286 my($height)=@_;
 287
 288         return '<p'.(!defined $height ? "" : ' style="height: '.$height.';"').'>&nbsp;</p>'."\n";
 289 }
 290
 291 sub fatal (;$)
 292 {
 293 my($msg)=@_;
 294
 295         $msg="UNKNOWN" if !$msg;
 296         cluck "FATAL: $msg";
 297
 298         $W->{"indexme"}=0;      # For the case no heading was sent yet.
 299         # Do not send it unconditionally.
 300         # The intial duplicated '<?xml...' crashes Gecko parser.
 301         $W->{"heading_done"}=0 if $W->{"header_only"};
 302         $W->{"header_only"}=0;  # assurance for &heading
 303         My::Web->heading();
 304         Wprint "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
 305                         ."<p>You can report this problem's details to"
 306                         ." ".a_href("mailto:".$W->{"admin_mail"},"admin of this website").".</p>\n";
 307         footer();
 308 }
 309
 310 sub footer (;$)
 311 {
 312         exit 1 if $W->{"footer_passed"}++;      # deadlock prevention:
 313
 314         Wprint vskip if $W->{"footer_delimit"};
 315
 316         do { &{$_}() if $_; } for ($W->{"footing_delimit"});
 317
 318         Wprint "<hr />\n" if $W->{"footer"};
 319
 320         if ($W->{"footer_mailme"}) {
 321                 Wprint '<form action="'.top_dir('/SendMsg.pl').'" method="post" onsubmit="'
 322                                 ."this.elements['msgscript'].value=this.elements['msghtml'].value;"
 323                                 ."this.elements['msghtml'].value='';"
 324                                 ."this.submit();"
 325                                 .'">'."\n";
 326                         Wprint input_hidden_persistents()."\n";
 327                         Wprint '<p align="right">'."\n";
 328                                 Wprint '<input name="msgscript" type="hidden" />'."\n";
 329                                 Wprint '<input name="msghtml" type="text" size="32" alt="Message" />'."\n";
 330                                 Wprint '<input name="submit" type="submit" value="Quick Note" />'."\n";
 331                         Wprint '</p>'."\n";
 332                 Wprint '</form>'."\n";
 333                 }
 334
 335         my @packages_used=(
 336                         $W->{"__PACKAGE__"},
 337                         __PACKAGE__,
 338                         @{$W->{"packages_used"}{"__My::Web"}},
 339                         map((!$_ ? () : @$_),$W->{"packages_used"}{$W->{"__PACKAGE__"}}),
 340                         );
 341         my %packages_used;
 342         @packages_used=grep((!$packages_used{$_}++),@packages_used);
 343         if ($W->{"footer_ids"}) {
 344                 Wprint '<p class="cvs-id">';
 345                 Wprint join("<br />\n",map({ my $package=$_;
 346                         my $cvs_id=(eval('$'.$package."::CVS_ID")
 347 #                                       || $package     # debug
 348                                         );
 349                         if (!$cvs_id) {
 350                                 ();
 351                                 }
 352                         else {
 353                                 $cvs_id='$'.$cvs_id.'$';        # Eaten by 'q' operator.
 354                                 my @cvs_id_split=split / +/,$cvs_id;
 355                                 if (@cvs_id_split==8) {
 356                                         my $file=$package;
 357                                         $file=~s#::#/#g;
 358                                         my $ext;
 359                                         my @tried;
 360                                         for (qw(.html.pl .pl .pm),"") {
 361                                                 $ext=$_;
 362                                                 my $pathname=top_dir_disk()."/$file$ext";
 363                                                 push @tried,$pathname;
 364                                                 last if -r $pathname;
 365                                                 cluck "Class file $file not found; tried: ".join(" ",@tried) if !$ext;
 366                                                 }
 367                                         $file.=$ext;
 368                                         $cvs_id_split[2]=""
 369                                                         .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $W->{"viewcvs"}))[0]."$file?rev=".$cvs_id_split[2],
 370                                                                         $cvs_id_split[2]);
 371                                         $cvs_id_split[1]=a_href($W->{"viewcvs"}.$file,
 372                                                         ($package!~/^Apache2::/ ? $package : $cvs_id_split[1]));
 373                                         $cvs_id_split[5]=&{$W->{"cvs_id_author"}}($cvs_id_split[5]);
 374                                         }
 375                                 join " ",@cvs_id_split;
 376                                 }
 377                         } @packages_used));
 378                 Wprint "</p>\n";
 379                 }
 380
 381         for my $package (@packages_used) {
 382                 my $cvs_id=(eval('$'.$package."::CVS_ID")
 383 #                               || $package     # debug
 384                                 );
 385                 Wprint '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
 386                 }
 387
 388         do { &{$_}() if $_; } for ($W->{"footing"});
 389
 390         Wprint "</body></html>\n";
 391         exit(0);
 392 }
 393
 394 sub header (%)
 395 {
 396 my(%pairs)=@_;
 397
 398         while (my($key,$val)=each(%pairs)) {
 399                 do { cluck "Headers already sent"; next; } if $W->{"heading_done"};
 400                 for ($W->{"headers_lc"}{lc $key} || ()) {
 401                         delete $W->{"headers"}{$_};
 402                         }
 403                 $W->{"headers_lc"}{lc $key}=$key;
 404                 $W->{"headers"}{$key}=$val;
 405                 }
 406 }
 407
 408 sub size_display ($)
 409 {
 410 my($size)=@_;
 411
 412            if ($size<4096)
 413                 {}
 414         elsif ($size<1024*1024)
 415                 { $size=sprintf "%.1fK",$size/1024; }
 416         else
 417                 { $size=sprintf "%.1fM",$size/1024/1024; }
 418         $size.="B";
 419         return $size;
 420 }
 421
 422 sub url_is_local ($)
 423 {
 424 my($url)=@_;
 425
 426         return $url!~m#^[a-z]+://#;
 427 }
 428
 429 sub url_out($%)
 430 {
 431 my($url,%args)=@_;
 432
 433         return $url if !url_is_local $url;
 434         $url=top_dir($url,%args) if $url=~m#^/# || $args{"abs"};
 435
 436         my $uri=URI->new($url);
 437         # Prefer the $uri values over "args_persistent" values.
 438         $uri->query_form_hash({
 439                         map({
 440                                 my $key=$_;
 441                                 my $val=$W->{"args"}{$key};
 442                                 (!defined $val ? () : ($key=>$val));
 443                                 } keys(%{$W->{"args_persistent"}})),
 444                         %{$uri->query_form_hash()},
 445                         });
 446         $url="".$uri;
 447
 448         return $url;
 449 }
 450
 451 sub a_href ($;$%)
 452 {
 453 my($url,$contents,%args)=@_;
 454
 455         do { $$_=1 if !defined $$_; } for (\$args{"size"});
 456         if (!defined $contents) {
 457                 $contents=$url;
 458                 $contents=File::Basename::basename($contents) if $args{"basename"};
 459                 $contents=CGI::escapeHTML($contents);
 460                 }
 461         $contents=~s#<a\b[^>]*>##gi;
 462         $contents=~s#</a>##gi;
 463
 464         $url=url_out($url,%args);
 465
 466         my $r='<a href="';
 467         my $urlent=CGI::escapeHTML($url);
 468            if ($url eq $urlent)
 469                 { $r.=$url; }
 470         elsif (url_is_local $url)
 471                 { $r.=$urlent; }
 472         elsif (defined $W->{"have_ent"} && !$W->{"have_ent"})   # non-ent client
 473                 { $r.=$url; }
 474         elsif ($W->{"have_ent"})        # ent client
 475                 { $r.=$urlent; }
 476         else    # unknown client, &CGI::escapeHTML should not be needed here
 477                 { $r.=CGI::escapeHTML(top_dir('/Redirect.pl?location='.uri_escape($url))); }
 478         $r.='"';
 479         do { $r.=" $_" if $_; } for ($args{"attr"});
 480         $r.='>'.$contents.'</a>';
 481         if ($args{"size"} && url_is_local($url) && ($args{"size"}>=2 || $url=~/[.](?:gz|Z|rpm|zip|deb|lha)/)) { # Downloadable?
 482                 $url=top_dir_disk().$url if $url=~m#^/#;
 483                 if (!-r $url)
 484                         { cluck "File not readable: $url"; }
 485                 else {
 486                         $r.='&nbsp;('.size_display((stat($url))[7]).')';
 487                         }
 488                 }
 489         return $r;
 490 }
 491
 492 sub input_hidden_persistents()
 493 {
 494         return join("",map({
 495                 my $key=$_;
 496                 my $val=$W->{"args"}{$key};
 497                 (!defined $val ? () : '<input type="hidden"'
 498                                 .' name="'.CGI::escapeHTML($key).'"'
 499                                 .' value="'.CGI::escapeHTML($val).'"'
 500                                 .' />'."\n");
 501                 } (keys(%{$W->{"args_persistent"}}))));
 502 }
 503
 504 sub http_moved($$;$)
 505 {
 506 my($self,$url,$status)=@_;
 507
 508         $url=url_out($url,"abs"=>1);
 509         $status||=HTTP_MOVED_TEMPORARILY;
 510         $W->{"r"}->status($status);
 511         $W->{"r"}->headers_out()->{"Location"}=$url;
 512         $W->{"header_only"}=1;
 513         My::Web->heading();
 514         exit;
 515         die "NOTREACHED";
 516 }
 517
 518 sub remote_ip ()
 519 {
 520         # Do not: PerlModule                 Apache2::ForwardedFor
 521         #         PerlPostReadRequestHandler Apache2::ForwardedFor
 522         # As 'Apache2::ForwardedFor' takes the first of $ENV{"HTTP_X_FORWARDED_FOR"}
 523         # while the contents is '127.0.0.1, 213.220.195.171' if client has its own proxy.
 524         # We must take the last item ourselves.
 525         my $r=$W->{"r"}->headers_in()->{"X-Forwarded-For"} || $W->{"r"}->get_remote_host();
 526         $r=~s/^.*,\s*//;
 527         return $r;
 528 }
 529
 530 sub is_cz ()
 531 {
 532         return 0 if !$have_Geo_IP;
 533         return "CZ" eq Geo::IP->new()->country_code_by_addr(remote_ip());
 534 }
 535
 536 sub a_href_cz ($$;%)
 537 {
 538 my($url,$contents,%args)=@_;
 539
 540         return a_href $url,$contents,%args if is_cz();
 541         return $contents;
 542 }
 543
 544 sub make ($)
 545 {
 546 my($cmd)=@_;
 547
 548         system {'flock'} 'flock','-x',top_dir_disk(),$cmd.' >&2';
 549 }
 550
 551 sub img_size ($$)
 552 {
 553 my($width,$height)=@_;
 554
 555         return ($W->{"have_style"} ? "style=\"border:0;width:${width}px;height:${height}px\"" : "border=\"0\"")
 556                         ." width=\"$width\" height=\"$height\"";
 557 }
 558
 559 sub negotiate_variant (%)
 560 {
 561 my(%args)=@_;
 562
 563         my @fields=("id","qs","content-type","encoding","charset","lang","size");
 564         return [ map(($args{$_}),@fields) ];
 565 }
 566
 567 # Input: $self is required!
 568 # Input: Put the fallback variant as the first one.
 569 # Returns: always only scalar!
 570 sub Negotiate_choose($$)
 571 {
 572 my($self,$variants)=@_;
 573
 574         my $best=HTTP::Negotiate::choose($variants,
 575                         # Do not: $W->{"r"}
 576                         # to prevent: Can't locate object method "scan" via package "Apache2::RequestRec" at HTTP/Negotiate.pm line 84.
 577                         # Do not: $W->{"r"}->headers_in()
 578                         # to prevent: Can't locate object method "scan" via package "APR::Table" at HTTP/Negotiate.pm line 84.
 579                         # Do not: HTTP::Headers->new($W->{"r"}->headers_in());
 580                         # to prevent empty result or even: Odd number of elements in anonymous hash
 581                         HTTP::Headers->new(%{$W->{"r"}->headers_in()}));
 582         $best||=$variants->[0]{"id"};   # &HTTP::Negotiate::choose failed?
 583         return $best;
 584 }
 585
 586 my @img_variants=(
 587                 { "id"=>"png","qs"=>0.9,"content-type"=>"image/png" },
 588                 { "id"=>"gif","qs"=>0.7,"content-type"=>"image/gif" },
 589                 );
 590 my $img_variants_re='[.](?:'.join('|',"jpeg",map(($_->{"id"}),@img_variants)).')$';
 591
 592 sub img_src ($)
 593 {
 594 my($file_base)=@_;
 595
 596         if (!url_is_local($file_base)) {
 597                 return $file_base if !wantarray();
 598                 return ($file_base,$file_base);
 599                 }
 600         # Known image extension?
 601         if ($file_base=~m#$img_variants_re#o) {
 602                 return $file_base if !wantarray();
 603                 return ($file_base,$file_base) if $file_base!~m#^/#;
 604                 return (top_dir($file_base),top_dir_disk().$file_base);
 605                 }
 606
 607         my $file_base_disk;
 608         my $file_base_uri;
 609         if ($file_base!~m#^/#) {
 610                 $file_base_disk=$file_base_uri=$file_base;
 611                 }
 612         else {
 613                 $file_base_disk=top_dir_disk().$file_base;
 614                 $file_base_uri=top_dir($file_base);
 615                 }
 616
 617         my @nego_variants;
 618         for my $var (@img_variants) {
 619                 my $file=$file_base_disk.".".$var->{"id"};
 620                 # TODO: Somehow quickly check dependencies?
 621                 make('make -s --no-print-directory'
 622                                                 .' -C '."'".File::Basename::dirname($file)."' '".File::Basename::basename($file)."'")
 623                                 if !-f $file;
 624                 push @nego_variants,negotiate_variant(
 625                                 %$var,
 626                                 "size"=>(stat $file)[7],
 627                                 );
 628                 }
 629         my $ext=__PACKAGE__->Negotiate_choose(\@nego_variants);
 630
 631         return $file_base_uri.".".$ext if !wantarray();
 632         return ($file_base_uri.".".$ext,$file_base_disk.".".$ext);
 633 }
 634
 635 sub img ($$;%)
 636 {
 637 my($file_base,$alt,%attr)=@_;
 638
 639         my($file_uri,$file_disk)=img_src $file_base;
 640         my($width,$height)=Image::Size::imgsize($file_disk);
 641         $alt=~s/<[^>]*>//g;
 642         $alt=CGI::escapeHTML($alt);
 643         my $content="<img src=\"$file_uri\" alt=\"$alt\" title=\"$alt\" ".img_size($width,$height)
 644                         .(!$attr{"attr"} ? "" : " ".$attr{"attr"})." />";
 645         return a_href img_src($attr{"a_href_img"}),$content if $attr{"a_href_img"};
 646         return a_href $attr{"a_href"},$content if $attr{"a_href"};
 647         return $content;
 648 }
 649
 650 sub centerimg
 651 {
 652         my $r.="";
 653         $r.='<table border="0" width="100%"><tr>'."\n";
 654         @_=( [@_] ) if !ref $_[0];
 655         for (@_) {
 656                 $r.="\t".'<td align="center">'.&{\&img}(@$_).'</td>'."\n";
 657                 }
 658         $r.='</tr></table>'."\n";
 659         return $r;
 660 }
 661
 662 sub rightimg
 663 {
 664 my($text,@args_img)=@_;
 665
 666         # Workaround bug of 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)':
 667         return <<"HERE";
 668 <table border="0" width="100%">
 669         <col width="@{[ (!$W->{"browser"}->ie() ? "1*" : "90%" ) ]}" />
 670         <col width="@{[ (!$W->{"browser"}->ie() ? "0*" : "10%" ) ]}" />
 671         <tr>
 672                 <td align="left">
 673                         @{[ $text ]}
 674                 </td>
 675                 <td align="right">
 676                         @{[ &{\&img}(@args_img) ]}
 677                 </td>
 678         </tr>
 679 </table>
 680 HERE
 681 }
 682
 683 sub readfile ($$)
 684 {
 685 my($class,$filename)=@_;
 686
 687         local *F;
 688         open F,$filename or die "Cannot open \"$filename\": $!";
 689         local $/=undef();
 690         my $data=<F>;
 691         close F;
 692         return $data;
 693 }
 694
 695 sub arr_keys (@)
 696 {
 697 my(@arr)=@_;
 698
 699         my @r=();
 700         while (@arr) {
 701                 push @r,shift @arr;     # key
 702                 shift @arr;     # val
 703                 }
 704         return @r;
 705 }
 706
 707 sub no_cache($)
 708 {
 709 my($self)=@_;
 710
 711         header("Expires"=>"Mon, 26 Jul 1997 05:00:00 GMT");     # date in the past
 712         header("Last-Modified"=>strftime("%a, %d %b %Y %H:%M:%S GMT",gmtime()));        # always modified
 713         header("Cache-Control"=>"no-cache, must-revalidate");   # HTTP/1.1
 714         header("Pragma"=>"no-cache");   # HTTP/1.0
 715 }
 716
 717 sub heading ()
 718 {
 719 my($class)=@_;
 720
 721         # $ENV{"CLIENT_CHARSET"} ignored (mod_czech support dropped!)
 722         my $client_charset=$W->{"force_charset"} || "us-ascii";
 723         header("Content-Style-Type"=>"text/css");
 724         header("Content-Script-Type"=>"text/javascript");
 725         do { header("Content-Language"=>$_) if $_; } for $W->{"language"};
 726         $class->no_cache() if $W->{"no_cache"};
 727
 728         while (my($key,$val)=each(%{$W->{"headers"}})) {
 729                 $W->{"r"}->headers_out()->{$key}=$val;
 730                 }
 731         exit if $W->{"r"}->header_only();
 732         return if $W->{"header_only"};
 733         # We still can append headers before we put out some text.
 734         # FIXME: It is not clean to still append them without overwriting.
 735         return if $W->{"heading_done"}++;
 736
 737         my $lang=($W->{"language"}||"en-US");
 738         # Workaround bug
 739         #   https://bugzilla.mozilla.org/show_bug.cgi?id=120556
 740         # of at least
 741         #   Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8b) Gecko/20050217
 742         my $mime=$class->Negotiate_choose([
 743                         # Put the fallback variant as the first one.
 744                         # Rate both variants the same to prefer "text/html" for undecided clients.
 745                         # At least
 746                         #   Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8b) Gecko/20050217
 747                         # prefers "application/xhtml+xml" over "text/html" itself:
 748                         #   text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
 749                         negotiate_variant(
 750                                         "id"=>"text/html",
 751                                         "content-type"=>"text/html",
 752                                         "qs"=>0.6,
 753                                         "charset"=>$client_charset,
 754                                         "lang"=>$lang,
 755                                         ),
 756                         negotiate_variant(
 757                                         "id"=>"application/xhtml+xml",
 758                                         "content-type"=>"application/xhtml+xml",
 759                                         "qs"=>0.6,
 760                                         "charset"=>$client_charset,
 761                                         "lang"=>$lang,
 762                                         ),
 763                         # application/xml ?
 764                         # text/xml ?
 765                         ]);
 766         $W->{"r"}->content_type("$mime; charset=$client_charset");
 767         if (1) { # || !$msie_major || $msie_major>=4) # TODO:dyn
 768                 Wprint '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n";
 769                 }
 770         Wprint '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
 771         Wprint '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="'.$lang.'">'."\n";
 772         my $title=$W->{"title_prefix"}.join("",map({ ': '.$_; } ($W->{"title"} || ())));
 773         $title=~s#<[^>]*>##g;
 774         Wprint "<head>";
 775         Wprint "<title>$title</title>\n";
 776         if ($W->{"have_css"}) {
 777                 # Everything can get overriden later.
 778                 Wprint <<"HERE";
 779 <link rel="stylesheet" type="text/css" href="@{[ url_out("/My/Web.css") ]}" />
 780 HERE
 781                 }
 782         Wprint '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
 783         Wprint $W->{"head"};
 784         for my $type (qw(prev next index contents start up)) {
 785                 do { Wprint '<link rel="'.$type.'" href="'.$_.'" />'."\n" if $_; } for ($W->{"rel_$type"});
 786                 }
 787         Wprint "</head><body";
 788 #       Wprint ' bgcolor="black" text="white" link="aqua" vlink="teal"'
 789 #                       if $W->{"browser"}->netscape() && (!$W->{"browser"}->major() || $W->{"browser"}->major()<=4);
 790         Wprint $W->{"body_attr"};
 791         Wprint ">\n";
 792
 793         do { &{$_}() if $_; } for ($W->{"heading"});
 794 }
 795
 796 BEGIN {
 797         delete $W->{"__My::Web_init"};
 798         }
 799
 800 1;