Web.pm

   1 # $Id$
   2 # Common functions for HTML/XHTML output generation
   3 # Copyright (C) 2003-2005 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(
  31                 &Wrequire &Wuse
  32                 &path_web &path_abs_disk
  33                 &uri_escaped
  34                 &a_href &a_href_cc
  35                 &vskip
  36                 &img &centerimg &rightimg
  37                 $W
  38                 &input_hidden_persistents
  39                 &escapeHTML
  40                 );
  41 our @ISA=qw(Tie::Handle Exporter);
  42
  43 my %packages_used_hash; # $packages_used_hash{$W->{"__PACKAGE__"}}{"_done"}=1;
  44 my %packages_used_array;
  45
  46 BEGIN
  47 {
  48         use Carp qw(cluck confess);
  49         $W->{"__My::Web_init"}=1;
  50
  51         sub Wrequire ($)
  52         {
  53         my($file)=@_;
  54
  55 #               print STDERR "Wrequire $file\n";
  56                 $file=~s#/#::#g;
  57                 $file=~s/[.]pm$//;
  58                 my $class=$file;
  59                 $file=~s#::#/#g;
  60                 $file.=".pm";
  61                 my %callers;
  62                 for (my $depth=0;defined caller($depth);$depth++) {
  63                         $callers{caller($depth)}=1;
  64                         }
  65                 my $selfpkg=__PACKAGE__;
  66                 $callers{$selfpkg}=1;
  67                 for my $target ($class,__PACKAGE__) {
  68                         for my $caller (keys(%callers)) {
  69                                 next if $caller eq $target;
  70                                 next if $packages_used_hash{$caller}{$target}++;
  71                                 cluck "Appending to the '_done' package list: caller=$caller,target=$target"
  72                                                 if $packages_used_hash{$caller}{"_done"};
  73                                 push @{$packages_used_array{$caller}},$target;
  74                                 }
  75                         }
  76                 eval { CORE::require "$file"; } or confess $@;
  77                 1;      # Otherwise 'require' would already file above.
  78         }
  79
  80         sub Wuse ($@)
  81         {
  82         my($file,@list)=@_;
  83
  84 #               print STDERR "Wuse $file\n";
  85                 Wrequire $file;
  86                 local $Exporter::ExportLevel=$Exporter::ExportLevel+1;
  87                 $file->import(@list);
  88                 1;
  89         }
  90
  91         sub import
  92         {
  93         my($class,@rest)=@_;
  94
  95                 local $Exporter::ExportLevel=$Exporter::ExportLevel+1;
  96                 Wrequire("$class");
  97                 return $class->SUPER::import(@rest);
  98         }
  99 }
 100
 101 use WebConfig;  # see also below: Wuse 'WebConfig';
 102 require CGI;
 103 require Image::Size;    # for &imgsize
 104 use File::Basename;     # &basename
 105 use Carp qw(cluck confess);
 106 use URI::Escape;
 107 require HTTP::BrowserDetect;
 108 require HTTP::Negotiate;
 109 our $have_Geo_IP; BEGIN { $have_Geo_IP=eval { require Geo::IP; 1; }; }
 110 # Do not: use ModPerl::Util qw(exit);
 111 # to prevent in mod_perl2: "exit" is not exported by the ModPerl::Util module
 112 # I do not know why.
 113 use POSIX qw(strftime);
 114 use Tie::Handle;
 115 use Apache2::Const qw(HTTP_MOVED_TEMPORARILY OK HTTP_OK);
 116 use URI;
 117 use URI::QueryParam;
 118 use Cwd;
 119 require HTTP::Date;
 120 require Storable;
 121 require Digest::MD5;
 122 require Data::Compare;
 123 use Data::Dumper;
 124 require Encode;
 125 use Apache2::Filter;
 126 use Apache2::Connection;
 127 require MIME::Base64;
 128 use Apache2::ServerUtil;
 129 require MIME::Types;
 130
 131
 132 #our $W;
 133
 134 sub init ($%)
 135 {
 136 my($class,%args)=@_;
 137
 138         print STDERR "$class->init ".Apache2::RequestUtil->request()->unparsed_uri()."\n";
 139
 140         # We need to track package dependencies, so we need to call it from &init.
 141         # We cannot do it in BEGIN { } block
 142         # as it would not be tracked for each of the toplevel users later.
 143         Wuse 'WebConfig';
 144         Wrequire 'My::Hash';
 145
 146         $W=My::Hash->new({
 147                 "__PACKAGE__"=>scalar(caller()),
 148                 %WebConfig,
 149                 %args,  # override %WebConfig settings
 150                 },"My::Hash::Sub","My::Hash::Push");
 151
 152         # {"__PACKAGE__"} is mandatory for mod_perl-2.0;
 153         # $Apache2::Registry::curstash is no longer supported.
 154         do { cluck "No $_" if !$W->{$_}; } for "__PACKAGE__";
 155
 156         # See: &escapeHTML
 157         do { cluck "charset==$_, expecting ISO-8859-1" if $_ ne "ISO-8859-1"; } for CGI::charset();
 158         CGI::charset("utf-8");
 159
 160         do { $W->{$_}=0  if !defined $W->{$_}; } for "detect_ent";
 161         do { $W->{$_}=0  if !defined $W->{$_}; } for "detect_js";
 162         do { $W->{$_}=1  if !defined $W->{$_}; } for "have_css";        # AFAIK it does not hurt anyone.
 163         do { $W->{$_}=0  if !defined $W->{$_}; } for "css_inherit";
 164         do { $W->{$_}=1  if !defined $W->{$_}; } for "footer";
 165         do { $W->{$_}=1  if !defined $W->{$_}; } for "footer_delimit";
 166         do { $W->{$_}=1  if !defined $W->{$_}; } for "footer_ids";
 167         do { $W->{$_}=1  if !defined $W->{$_}; } for "indexme";
 168         do { $W->{$_}="" if !defined $W->{$_}; } for "head";
 169         do { $W->{$_}="" if !defined $W->{$_}; } for "body_attr";
 170         do { $W->{$_}="en-US" if !defined $W->{$_}; } for "language";
 171
 172         my $footer_any=0;
 173         for (qw(footer_ids)) {
 174                 $W->{$_}=0 if !$W->{"footer"};
 175                 $footer_any=1 if $W->{$_};
 176                 }
 177         $W->{"footer"}=0 if !$footer_any;
 178         $W->{"footer_delimit"}=0 if !$W->{"footer"};
 179
 180         $W->{"r"}=Apache2::RequestUtil->request();
 181
 182         $W->{"r"}->push_handlers("PerlCleanupHandler"=>\&cleanup);
 183
 184         $W->{"web_hostname"}||=$W->{"r"}->hostname();
 185
 186         tie *STDOUT,$W->{"r"};
 187         select *STDOUT;
 188         $|=1;
 189
 190         $W->{"QUERY_STRING"}=$W->{"r"}->args() || "";
 191         if ($W->{"detect_ent"}) {
 192                          if ($W->{"QUERY_STRING"}=~/[&]amp;have_ent/)
 193                         { $W->{"have_ent"}=0; }
 194                 elsif ($W->{"QUERY_STRING"}=~    /[&]have_ent/)
 195                         { $W->{"have_ent"}=1; }
 196                 else
 197                         { delete $W->{"have_ent"}; }
 198                 if (!defined $W->{"have_ent"} && $W->{"r"}->method() eq "GET") {
 199                         $W->{"head"}.='<meta http-equiv="Refresh" content="0; URL='
 200                                         .escapeHTML("http://".$W->{"web_hostname"}."/".($W->{"r"}->uri()=~m#^/*(.*)$#)[0]
 201                                                         ."?".($W->{"QUERY_STRING"} || "detect_ent_glue=1").'&have_ent=detect')
 202                                         .'" />'."\n";
 203                         }
 204                 }
 205         $W->{"QUERY_STRING"}=~s/([&])amp;/$1/g;
 206         $W->{"r"}->args($W->{"QUERY_STRING"});
 207         # Workaround: &CGI::Vars behaves weird if strings passed both as POST data and in: $QUERY_STRING
 208         do { $W->{"r"}->args(""); delete $ENV{"QUERY_STRING"}; } if $W->{"r"}->method() eq "POST";
 209         # Do not: $W->{"r"}->args()
 210         # as it parses only QUERY_STRING (not POST data).
 211         $W->{"args_orig_array"}=[ CGI->new($W->{"r"})->Vars() ];
 212         $W->{"args"}={ @{$W->{"args_orig_array"}} };
 213         for my $name (keys(%{$W->{"args"}})) {
 214                 my @vals=split /\x00/,$W->{"args"}{$name};
 215                 next if @vals<=1;
 216                 $W->{"args"}{$name}=[@vals];
 217                 }
 218
 219         $W->{"headers_in"}=$W->{"r"}->headers_in();
 220         Wrequire 'My::Hash::Merge';
 221         $W->{"headers_in"}=My::Hash::Merge->new(
 222                         $W->{"headers_in"},
 223                         My::Hash::Sub->new({
 224                                 "_remote_ip"=>sub { return $W->{"r"}->connection()->remote_ip(); },
 225                                 }),
 226                         );
 227         Wrequire 'My::Hash::Readonly';
 228         $W->{"headers_in"}=My::Hash::Readonly->new($W->{"headers_in"});
 229
 230         if ($W->{"r"}->method() eq "GET" || $W->{"r"}->method() eq "HEAD") {
 231                 for (\$W->{"http_safe"}) {
 232                         # Do not: # Extend the current ETag system instead if you would need it:
 233                         #         cluck "Explicitely NOT HTTP-Safe for method \"".$W->{"r"}->method()."\"?!?"
 234                         #                       if defined($$_) && !$$_;
 235                         # as sometimes it just does not make sense to cache it.
 236                         $$_=1 if !defined $$_;
 237                         }
 238                 }
 239         else {
 240                 for (\$W->{"http_safe"}) {
 241                         cluck "Undefined HTTP-Safe-ty for method \"".$W->{"r"}->method()."\"!"
 242                                         if !defined($$_);
 243                         $$_=0 if !defined $$_;
 244                         }
 245                 }
 246         if ($W->{"http_safe"}) {
 247                 Wrequire 'My::Hash::RecordKeys';
 248                 $W->{"headers_in_RecordKeys"}=My::Hash::RecordKeys->new($W->{"headers_in"});
 249                 $W->{"headers_in"}=$W->{"headers_in_RecordKeys"};
 250                 }
 251
 252         $W->{"browser"}=sub {
 253                 # Lazy-evaluation, we may not need the "User-Agent" header at all.
 254                 return our $r||=HTTP::BrowserDetect->new($W->{"headers_in"}{"User-Agent"});
 255                 };
 256
 257         if (!defined $W->{"have_style"}) {
 258                 $W->{"have_style"}=(!$W->{"browser"}->netscape() || ($W->{"browser"}->major() && $W->{"browser"}->major()>4) ? 1 : 0);
 259                 }
 260
 261         $W->{"have_js"}=($W->{"args"}{"have_js"} ? 1 : 0);
 262         if ($W->{"detect_js"} && !$W->{"have_js"}) {
 263                 $W->{"head"}.='<script type="text/javascript" src="'.uri_escaped(path_web('/My/HaveJS.pm')).'"></script>'."\n";
 264                 }
 265
 266         do { _args_check(%$_) if $_; } for ($W->{"args_check"});
 267
 268         return bless $W,$class;
 269 }
 270
 271 sub cleanup($)
 272 {
 273 my($apache_request)=@_;
 274
 275         cluck "CORE::GLOBAL::exit hook not ran" if !$W->{"_exit_ran"};
 276         cluck "packages not finalized" if !$packages_used_hash{$W->{"__PACKAGE__"}}{"_done"};
 277         cache_finish();
 278         # Sanity protection.
 279         $W=undef();
 280         return OK;
 281 }
 282
 283 # PerlResponseHandler is RUN_FIRST and &ModPerl::Util::exit returns OK, so no (sane) go.
 284 # PerlLogHandler is already too late to be able to produce any output.
 285 my $exit_orig=\&CORE::GLOBAL::exit;
 286 sub exit_hook
 287 {
 288                 # &footer will call us recursively!
 289                 footer() if !$W->{"_exit_ran"}++;
 290                 return &{$exit_orig}(@_);
 291 }
 292 {
 293         # Prevent: Subroutine CORE::GLOBAL::exit redefined
 294         no warnings 'redefine';
 295         *CORE::GLOBAL::exit=\&exit_hook;
 296         }
 297
 298 # Be aware other parts of code (non-My::Web) will NOT use this function!
 299 # Do not: Wprint $W->{"heading"},"undef"=>1;
 300 # as we would need to undef() it to turn it off and it would get defaulted in such case.
 301 # Do not: exists $W->{"heading"}
 302 # as we use a lot of 'for $W->{"heading"}' which instantiates it with the value: undef()
 303 sub Wprint($%)
 304 {
 305 my($text,%args)=@_;
 306
 307         cluck "undef Wprint" if !defined $text && !$args{"undef"};
 308         delete $args{"undef"};
 309         cluck join(" ","Invalid arguments:",keys(%args)) if keys(%args);
 310         return if !defined $text;
 311         # Do not: cluck "utf-8 untested" if Encode::is_utf8($text);
 312         # as it is valid here.
 313         $W->{"r"}->puts($text);
 314 }
 315
 316 sub request_check(;$)
 317 {
 318 my($self)=@_;
 319
 320         # Use &eval to prevent: Global $r object is not available. Set:\n\tPerlOptions +GlobalRequest\nin ...
 321         # CGI requires valid "r": check it beforehand here.
 322         confess "Calling sensitive dynamic code from a static code" if !eval { Apache2::RequestUtil->request(); };
 323         # Do not: confess "Calling sensitive dynamic code without My::Web::init" if !$W->{"__PACKAGE__"};
 324         # as it is valid at least while preparing arguments to call: &project::Lib::init
 325 }
 326
 327 sub escapeHTML($)
 328 {
 329 my($text)=@_;
 330
 331         # Prevent &CGI::escapeHTML breaking utf-8 strings like: \xC4\x9B eq \x{11B}
 332         # Prevent case if we run under mod_perl but still just initializing:
 333         request_check() if $ENV{"MOD_PERL"};
 334         # Generally we are initialized from &init but we may be used without it without mod_perl
 335         # and in such case check the change on all non-first invocations.
 336         our $init;
 337         if (!$ENV{"MOD_PERL"} && $init++) {
 338                 do { cluck "charset==$_" if $_ ne "utf-8"; } for CGI::charset();
 339                 }
 340         CGI::charset("utf-8");
 341
 342         return CGI::escapeHTML($text);
 343 }
 344
 345 # /home/user/www/webdir
 346 sub dir_top_abs_disk()
 347 {
 348         our $dir_top_abs_disk;
 349         if (!$dir_top_abs_disk) {
 350                 my $selfpkg_relpath=__PACKAGE__;
 351                 $selfpkg_relpath=~s{::}{/}g;
 352                 $selfpkg_relpath.=".pm";
 353                 my $selfpkg_abspath=$INC{$selfpkg_relpath} or do {
 354                         cluck "Unable to find self package $selfpkg_relpath";
 355                         return;
 356                         };
 357                 $selfpkg_abspath=~s{/*\Q$selfpkg_relpath\E$}{} or do {
 358                         cluck "Unable to strip myself \"$selfpkg_relpath\" from the abspath: $selfpkg_abspath";
 359                         return;
 360                         };
 361                 cluck "INC{myself} is relative?: $selfpkg_abspath" if $selfpkg_abspath!~m{^/};
 362                 $dir_top_abs_disk=$selfpkg_abspath;
 363                 }
 364         return $dir_top_abs_disk;
 365 }
 366
 367 sub unparsed_uri()
 368 {
 369         request_check();
 370         if (!$W->{"unparsed_uri"}) {
 371                 # Do not: $W->{"r"}
 372                 # as we may be called before &init from: &My::Project::init
 373                 my $r=Apache2::RequestUtil->request();
 374                 cluck "Calling ".'&unparsed_uri'." from a static code, going to fail" if !$r;
 375                 my $uri_string=$r->unparsed_uri() or cluck "Valid 'r' missing unparsed_uri()?";
 376                 my $uri=URI->new_abs($uri_string,"http://".$W->{"web_hostname"}."/");
 377                 $W->{"unparsed_uri"}=$uri;
 378                 }
 379         return $W->{"unparsed_uri"};
 380 }
 381
 382 sub in_to_uri_abs($)
 383 {
 384 my($in)=@_;
 385
 386         # Otherwise we may have been already processed and thus legally relativized.
 387         # FIXME data: Currently disabled, all the data are too violating such rule.
 388         if (0 && !ref $in) {
 389                 my $uri_check=URI->new($in);
 390                 $uri_check->scheme() || $in=~m{^\Q./\E} || $in=~m{^/}
 391                                 or cluck "Use './' or '/' prefix for all the local references: $in";
 392                 }
 393         my $uri=URI->new_abs($in,unparsed_uri());
 394         $uri=$uri->canonical();
 395         return $uri;
 396 }
 397
 398 # $args{"uri_as_in"}=1 to permit passing URI objects as: $in
 399 # $args{"abs"}=1;
 400 sub path_web($%)
 401 {
 402 my($in,%args)=@_;
 403
 404         cluck if !$args{"uri_as_in"} && ref $in;
 405         my $uri=in_to_uri_abs($in);
 406         if (uri_is_local($uri)) {
 407                 # Prefer the $uri values over "args_persistent" values.
 408                 $uri->query_form_hash({
 409                                 map({
 410                                         my $key=$_;
 411                                         my $val=$W->{"args"}{$key};
 412                                         (!defined $val ? () : ($key=>$val));
 413                                         } keys(%{$W->{"args_persistent"}})),
 414                                 %{$uri->query_form_hash()},
 415                                 });
 416                 }
 417         return $uri->abs(unparsed_uri()) if $W->{"args"}{"Wabs"} || $args{"abs"};
 418         return $uri->rel(unparsed_uri());
 419 }
 420
 421 sub path_abs_disk_register($)
 422 {
 423 my($path_abs_disk)=@_;
 424
 425         $W->{"path_abs_disk_register"}{$path_abs_disk}=1;
 426 }
 427
 428 # $args{"uri_as_in"}=1 to permit passing URI objects as: $in
 429 sub path_abs_disk($%)
 430 {
 431 my($in,%args)=@_;
 432
 433         cluck if !$args{"uri_as_in"} && ref $in;
 434         my $uri=in_to_uri_abs($in);
 435         cluck if !uri_is_local($uri);
 436         my $path=$uri->path();
 437         cluck "URI compatibility: ->path() not w/leading slash of URI \"$uri\"; path: $path" if $path!~m{^/};
 438         my $r=dir_top_abs_disk().$path;
 439         path_abs_disk_register $r if !defined $args{"register"} || $args{"register"};
 440         return $r;
 441 }
 442
 443 sub fatal (;$);
 444
 445 sub _args_check (%)
 446 {
 447 my(%tmpl)=@_;
 448
 449         while (my($name,$regex)=each(%tmpl)) {
 450                 my $name_html="Parameter <span class=\"quote\">".escapeHTML($name)."</span>";
 451                 $W->{"args"}{$name}="" if !defined $W->{"args"}{$name};
 452                 $W->{"args"}{$name}=[ $W->{"args"}{$name} ] if !ref $W->{"args"}{$name} && ref $regex;
 453                 fatal "$name_html passed as multivar although singlevar expected"
 454                                 if ref $W->{"args"}{$name} && !ref $regex;
 455                 $regex=$regex->[0] if ref $regex;
 456                 for my $val (!ref $W->{"args"}{$name} ? $W->{"args"}{$name} : @{$W->{"args"}{$name}}) {
 457                         $val="" if !defined $val;
 458                         fatal "$name_html <span class=\"quote\">".escapeHTML($val)."</span>"
 459                                                         ." does not match the required regex <span class=\"quote\">".escapeHTML($regex)."</span> "
 460                                         if $regex ne "" && $val!~/$regex/;
 461                         }
 462                 }
 463 }
 464
 465 sub vskip (;$)
 466 {
 467 my($height)=@_;
 468
 469         return '<p'.(!defined $height ? "" : ' style="height: '.$height.';"').'>&nbsp;</p>'."\n";
 470 }
 471
 472 sub fatal (;$)
 473 {
 474 my($msg)=@_;
 475
 476         $msg="UNKNOWN" if !$msg;
 477         cluck "FATAL: $msg";
 478
 479         # Do not send it unconditionally.
 480         # The intial duplicated '<?xml...' crashes Gecko parser.
 481         $W->{"heading_done"}=0 if $W->{"header_only"};
 482         # Do not send it unconditionally.
 483         # Prevents warn: Headers already sent
 484         if (!$W->{"heading_done"}) {
 485                 $W->{"indexme"}=0;      # For the case no heading was sent yet.
 486                 $W->{"header_only"}=0;  # assurance for &heading
 487                 My::Web->heading();
 488                 }
 489         Wprint "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
 490                         ."<p>You can report this problem's details to"
 491                         ." ".a_href("mailto:".$W->{"admin_mail"},"admin of this website").".</p>\n";
 492         exit;
 493 }
 494
 495 sub footer()
 496 {
 497         cluck 'Explicit &footer call is deprecated' if !$W->{"_exit_ran"};
 498         exit if $W->{"footer_passed"}++;        # deadlock prevention:
 499         if ($W->{"header_only"}) {
 500                 $packages_used_hash{$W->{"__PACKAGE__"}}{"_done"}=1;
 501                 exit;
 502                 }
 503
 504         Wprint vskip if $W->{"footer_delimit"};
 505         &{$_}() for reverse @{$W->{"footing_delimit_sub_push"}};
 506         Wprint "<hr />\n" if $W->{"footer"};
 507
 508         # Never update the package list while we examine it!
 509         $packages_used_hash{$W->{"__PACKAGE__"}}{"_done"}=1;
 510
 511         my $packages_used=$packages_used_array{$W->{"__PACKAGE__"}};
 512         if ($W->{"footer_ids"}) {
 513                 Wprint '<p class="cvs-id">';
 514                 Wprint join("<br />\n",map({ my $package=$_;
 515                         my $cvs_id=(eval('$'.$package."::CVS_ID")
 516 #                                       || $package     # debug
 517                                         );
 518                         if (!$cvs_id) {
 519                                 ();
 520                                 }
 521                         else {
 522                                 $cvs_id='$'.$cvs_id.'$';        # Eaten by 'q' operator.
 523                                 my @cvs_id_split=split / +/,$cvs_id;
 524                                 if (@cvs_id_split==8) {
 525                                         my $file=$package;
 526                                         $file=~s#::#/#g;
 527                                         my $ext;
 528                                         my @tried;
 529                                         for (qw(.pm)) {
 530                                                 $ext=$_;
 531                                                 my $path_abs_disk=path_abs_disk("/$file$ext");
 532                                                 push @tried,$path_abs_disk;
 533                                                 last if -r $path_abs_disk;
 534                                                 cluck "Class file $file not found; tried: ".join(" ",@tried) if !$ext;
 535                                                 }
 536                                         $file.=$ext;
 537                                         $cvs_id_split[2]=""
 538                                                         .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $W->{"viewcvs"}))[0]."$file?rev=".$cvs_id_split[2],
 539                                                                         $cvs_id_split[2]);
 540                                         $cvs_id_split[1]=a_href($W->{"viewcvs"}.$file,
 541                                                         ($package!~/^Apache2::/ ? $package : $cvs_id_split[1]));
 542                                         $cvs_id_split[5]=&{$W->{"cvs_id_author_sub"}}($cvs_id_split[5]);
 543                                         }
 544                                 join " ",@cvs_id_split;
 545                                 }
 546                         } @$packages_used));
 547                 Wprint "</p>\n";
 548                 }
 549
 550         for my $package (@$packages_used) {
 551                 my $cvs_id=(eval('$'.$package."::CVS_ID")
 552 #                               || $package     # debug
 553                                 );
 554                 Wprint '<!-- '.$package.' - $'.$cvs_id.'$ -->'."\n" if $cvs_id;
 555                 }
 556
 557         do { Wprint $_ if $_; } for $W->{"footing"};
 558
 559         Wprint "</body></html>\n";
 560         exit;
 561 }
 562
 563 # Existing entries are overwritten.
 564 sub header(%)
 565 {
 566 my(%pairs)=@_;
 567
 568         while (my($key,$val)=each(%pairs)) {
 569                 do { cluck "Headers already sent"; next; } if $W->{"heading_done"};
 570                 $W->{"r"}->headers_out()->set($key,$val);
 571                 }
 572 }
 573
 574 sub size_display ($)
 575 {
 576 my($size)=@_;
 577
 578            if ($size<4096)
 579                 {}
 580         elsif ($size<1024*1024)
 581                 { $size=sprintf "%.1fK",$size/1024; }
 582         else
 583                 { $size=sprintf "%.1fM",$size/1024/1024; }
 584         $size.="B";
 585         return $size;
 586 }
 587
 588 sub uri_is_local($)
 589 {
 590 my($in)=@_;
 591
 592         my $uri_rel=in_to_uri_abs($in)->rel(unparsed_uri());
 593         # Do not: defined $uri_rel->("userinfo"|"host"|"port")();
 594         # as they fail to be called for schemes not supporting them.
 595         return 0 if $uri_rel->scheme();
 596         return 0 if $uri_rel->authority();
 597         return 1;
 598 }
 599
 600 # &path_web still may be required for &uri_escaped !
 601 sub uri_escaped($)
 602 {
 603 my($uri)=@_;
 604
 605         cluck if !ref $uri;
 606         my $urient=escapeHTML($uri);
 607         return $uri    if $uri eq $urient;
 608         request_check();
 609         return $urient if uri_is_local $uri;
 610         return $uri    if defined $W->{"have_ent"} && !$W->{"have_ent"};        # non-ent client
 611         return $urient if $W->{"have_ent"};     # ent client
 612         # Unknown client, &escapeHTML should not be needed here:
 613         return escapeHTML(path_web('/My/Redirect.pm?location='.uri_escape($uri->abs(unparsed_uri()))));
 614 }
 615
 616 our $a_href_inhibited;
 617 sub a_href($;$%)
 618 {
 619 my($in,$contents,%args)=@_;
 620
 621         request_check();
 622         do { $$_=1 if !defined $$_; } for (\$args{"size"});
 623         if (!defined $contents) {
 624                 $contents=$in;
 625                 $contents=File::Basename::basename($contents) if $args{"basename"};
 626                 $contents=escapeHTML($contents);
 627                 }
 628         $contents=~s#<a\b[^>]*>##gi;
 629         $contents=~s#</a>##gi;
 630         return $contents if $a_href_inhibited;
 631
 632         my $path_web=path_web $in,%args;
 633         my $r="";
 634         $r.='<a href="';
 635         $r.=uri_escaped $path_web;
 636         $r.='"';
 637         do { $r.=" $_" if $_; } for ($args{"attr"});
 638         $r.='>'.$contents.'</a>';
 639         if ($args{"size"} && uri_is_local($in) && ($args{"size"}>=2 || $in=~/[.](?:gz|Z|rpm|zip|deb|lha)/)) {   # Downloadable?
 640                 my $path_abs_disk=path_abs_disk $in,%args;
 641                 cluck "File not readable: $path_abs_disk" if !-r $path_abs_disk;
 642                 $r.='&nbsp;('.size_display((stat($path_abs_disk))[7]).')';
 643                 }
 644         return $r;
 645 }
 646
 647 sub a_href_inhibit($$;@)
 648 {
 649 my($self,$sub,@sub_args)=@_;
 650
 651         local $a_href_inhibited=1;
 652         return &{$sub}(@sub_args);
 653 }
 654
 655 sub input_hidden_persistents()
 656 {
 657         request_check();
 658         return join("",map({
 659                 my $key=$_;
 660                 my $val=$W->{"args"}{$key};
 661                 (!defined $val ? () : '<input type="hidden"'
 662                                 .' name="'.escapeHTML($key).'"'
 663                                 .' value="'.escapeHTML($val).'"'
 664                                 .' />'."\n");
 665                 } (keys(%{$W->{"args_persistent"}}))));
 666 }
 667
 668 sub http_moved($$;$)
 669 {
 670 my($self,$url,$status)=@_;
 671
 672         $url=path_web($url,"abs"=>1);
 673         $status||=HTTP_MOVED_TEMPORARILY;
 674         $W->{"r"}->status($status);
 675         $W->{"r"}->headers_out()->{"Location"}=$url;
 676         $W->{"header_only"}=1;
 677         My::Web->heading();
 678         exit;
 679         die "NOTREACHED";
 680 }
 681
 682 sub remote_ip ()
 683 {
 684         # Do not: PerlModule                 Apache2::ForwardedFor
 685         #         PerlPostReadRequestHandler Apache2::ForwardedFor
 686         # As 'Apache2::ForwardedFor' takes the first of $ENV{"HTTP_X_FORWARDED_FOR"}
 687         # while the contents is '127.0.0.1, 213.220.195.171' if client has its own proxy.
 688         # We must take the last item ourselves.
 689         # Be VERY sure you always retrieve all the headers unconditionally to hit: My::Hash::RecordKeys
 690         my $x_forwarded_for=$W->{"headers_in"}{"X-Forwarded-For"};
 691         $x_forwarded_for=~s/^.*,\s*// if $x_forwarded_for;
 692         my $remote_ip=$W->{"headers_in"}{"_remote_ip"};
 693         my $r;
 694         $r||=$x_forwarded_for;
 695         $r||=$remote_ip;
 696         return $r;
 697 }
 698
 699 # $url={"JP"=>"http://specific",...};
 700 # $url={""=>"http://default",...};
 701 sub a_href_cc($$;%)
 702 {
 703 my($url,$contents,%args)=@_;
 704
 705         # A bit ineffective but we must process all the possibilities to get stable 'headers_in' hits!
 706         my %map=map(($_=>a_href($url->{$_},$contents,%args)),keys(%$url));
 707         my $cc;
 708         $cc||=Geo::IP->new()->country_code_by_addr(remote_ip()) if $have_Geo_IP;
 709         $cc||="";
 710         my $r=$map{$cc};
 711         return $r if $r;
 712         return $contents;
 713 }
 714
 715 sub make ($)
 716 {
 717 my($cmd)=@_;
 718
 719         # FIXME: &alarm, --timeout is now infinite.
 720         # FIXME: Try to remove bash(1).
 721         # FIXME: Use: @PATH_FLOCK@
 722         my @argv=('flock',dir_top_abs_disk(),'bash','-c',$cmd.' >&2');
 723         print STDERR join(" ","SPAWN:",@argv)."\n";
 724         system @argv;
 725 }
 726
 727 sub make_file($$)
 728 {
 729 my($self,$file)=@_;
 730
 731         cluck "Pathname not absolute: $file" if $file!~m{^/};
 732         return if -f $file;
 733         # TODO: Somehow quickly check dependencies?
 734         return make('make -s --no-print-directory'
 735                                         .' -C '."'".File::Basename::dirname($file)."' '".File::Basename::basename($file)."'");
 736 }
 737
 738 sub img_size ($$)
 739 {
 740 my($width,$height)=@_;
 741
 742         cluck if !defined $width || !defined $height;
 743         return ($W->{"have_style"} ? "style=\"border:0;width:${width}px;height:${height}px\"" : "border=\"0\"")
 744                         ." width=\"$width\" height=\"$height\"";
 745 }
 746
 747 sub negotiate_variant (%)
 748 {
 749 my(%args)=@_;
 750
 751         my @fields=("id","qs","content-type","encoding","charset","lang","size");
 752         return [ map(($args{$_}),@fields) ];
 753 }
 754
 755 # Input: $self is required!
 756 # Input: Put the fallback variant as the first one.
 757 # Returns: always only scalar!
 758 sub Negotiate_choose($$)
 759 {
 760 my($self,$variants)=@_;
 761
 762         # Limit these entries to generate proper 'Vary' header.
 763         my %hash=(map(($_=>$W->{"headers_in"}{$_}),qw(
 764                         Accept
 765                         Accept-Charset
 766                         Accept-Encoding
 767                         Accept-Language
 768                         )));
 769         my $best=HTTP::Negotiate::choose($variants,
 770                         # Do not: $W->{"r"}
 771                         # to prevent: Can't locate object method "scan" via package "Apache2::RequestRec" at HTTP/Negotiate.pm line 84.
 772                         # Do not: $W->{"r"}->headers_in()
 773                         # to prevent: Can't locate object method "scan" via package "APR::Table" at HTTP/Negotiate.pm line 84.
 774                         # Do not: HTTP::Headers->new($W->{"r"}->headers_in());
 775                         # to prevent empty result or even: Odd number of elements in anonymous hash
 776                         HTTP::Headers->new(%hash));
 777         $best||=$variants->[0][0];      # $variants->[0]{"id"}; &HTTP::Negotiate::choose failed?
 778         return $best;
 779 }
 780
 781 my @img_variants=(
 782                 { "id"=>"png","qs"=>0.9,"content-type"=>"image/png" },
 783                 { "id"=>"gif","qs"=>0.7,"content-type"=>"image/gif" },
 784                 );
 785 my $img_variants_re='[.](?:'.join('|',"jpeg",map(($_->{"id"}),@img_variants)).')$';
 786
 787 # Returns: ($path_web,$path_abs_disk)
 788 # URI path segments support ignored here. Where it is used? (';' path segment options)
 789 sub _img_src($%)
 790 {
 791 my($in,%args)=@_;
 792
 793         cluck if !uri_is_local $in;
 794         my $uri=in_to_uri_abs $in;
 795         my $path_abs_disk=path_abs_disk $uri,%args,"uri_as_in"=>1,"register"=>0;
 796
 797         # Known image extension?
 798         return path_web($uri,%args,"uri_as_in"=>1),$path_abs_disk if $uri->path()=~m#$img_variants_re#o;
 799
 800         my @nego_variants;
 801         for my $var (@img_variants) {
 802                 my $path_abs_disk_variant=$path_abs_disk.".".$var->{"id"};
 803                 path_abs_disk_register($path_abs_disk_variant);
 804                 __PACKAGE__->make_file($path_abs_disk_variant);
 805                 push @nego_variants,negotiate_variant(
 806                                 %$var,
 807                                 "size"=>(stat $path_abs_disk_variant)[7],
 808                                 );
 809                 }
 810         my $ext=__PACKAGE__->Negotiate_choose(\@nego_variants);
 811
 812         $uri->path($uri->path().".$ext");
 813         return path_web($uri,%args,"uri_as_in"=>1),path_abs_disk($uri,%args,"uri_as_in"=>1);
 814 }
 815
 816 # $args{"attr"}
 817 sub img ($$%)
 818 {
 819 my($in,$alt,%args)=@_;
 820
 821         request_check();
 822         my($path_web,$path_abs_disk)=_img_src($in,%args);
 823         my($width,$height)=Image::Size::imgsize($path_abs_disk);
 824         $alt=~s/<[^>]*>//g;
 825         $alt=escapeHTML($alt);
 826         my $content="<img src=\"".uri_escaped($path_web)."\" alt=\"$alt\" title=\"$alt\" ".img_size($width,$height)
 827                         .(!$args{"attr"} ? "" : " ".$args{"attr"})." />";
 828         do { return a_href((_img_src($_))[0],$content,"uri_as_in"=>1) if $_; } for $args{"a_href_img"};
 829         do { return a_href $_,$content if $_; } for $args{"a_href"};
 830         return $content;
 831 }
 832
 833 sub centerimg
 834 {
 835         my $r="";
 836         $r.='<table border="0" width="100%"><tr>'."\n";
 837         @_=( [@_] ) if !ref $_[0];
 838         for (@_) {
 839                 $r.="\t".'<td align="center">'.&{\&img}(@$_).'</td>'."\n";
 840                 }
 841         $r.='</tr></table>'."\n";
 842         return $r;
 843 }
 844
 845 sub rightimg
 846 {
 847 my($text,@args_img)=@_;
 848
 849         # FIXME: Workaround bug of 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)':
 850         #        <col width="@{[ (!$W->{"browser"}->ie() ? "1*" : "90%" ) ]}" />
 851         #        <col width="@{[ (!$W->{"browser"}->ie() ? "0*" : "10%" ) ]}" />
 852         # causes whole invisible projects in: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.10) Gecko/20050719 Galeon/1.3.21
 853         return <<"HERE";
 854 <table border="0" width="100%">
 855         <tr>
 856                 <td align="left">
 857                         @{[ $text ]}
 858                 </td>
 859                 <td align="right">
 860                         @{[ &{\&img}(@args_img) ]}
 861                 </td>
 862         </tr>
 863 </table>
 864 HERE
 865 }
 866
 867 sub readfile($$)
 868 {
 869 my($class,$filename)=@_;
 870
 871         local *F;
 872         open F,$filename or cluck "Cannot open \"$filename\": $!";
 873         my $F=do { local $/=undef(); <F>; };
 874         close F or cluck "Cannot close \"$filename\": $!";
 875         return $F;
 876 }
 877
 878 sub _no_cache($)
 879 {
 880 my($self)=@_;
 881
 882         header("Expires"=>HTTP::Date::time2str(1000000000));    # date in the past
 883         header("Last-Modified"=>HTTP::Date::time2str());        # always modified
 884         header("Cache-Control"=>join(", ",
 885                         "no-cache",
 886                         "no-store",
 887                         "must-revalidate",
 888                         "max-age=0",
 889                         "pre-check=0",  # MSIE
 890                         "post-check=0", # MSIE
 891                         ));     # HTTP/1.1
 892         header("Pragma"=>"no-cache");   # HTTP/1.0
 893         header("Vary"=>"*");    # content may ba based on unpredictable sources
 894 }
 895
 896 sub headers_in_filtered(@)
 897 {
 898 my(@keys)=@_;
 899
 900         return map(($_=>$W->{"headers_in"}{$_}),@keys);
 901 }
 902
 903 our %uri_args_frozen_to_headers_in_keys;
 904 our %uri_args_headers_in_frozen_to_headers_out;
 905
 906 sub uri_args_headers_in_frozen_get($)
 907 {
 908 my($headers_in_keys_arrayref)=@_;
 909
 910         my %uri_args_headers_in_hash=(
 911                 "uri_args_frozen"=>$W->{"uri_args_frozen"},
 912                 "headers_in"=>{ headers_in_filtered(@$headers_in_keys_arrayref) },
 913                 );
 914         return do { local $Storable::canonical=1; Storable::freeze(\%uri_args_headers_in_hash); };
 915 }
 916
 917 sub cache_output_filter($)
 918 {
 919 my($f)=@_;
 920
 921         while ($f->read(my $text,0x400)) {
 922                 cluck "utf-8 untested" if Encode::is_utf8($text);       # Possible here at all?
 923                 $f->print($text);
 924                 $W->{"digest-md5"}->add($text);
 925                 }
 926         return OK;
 927 }
 928
 929 sub cache_start()
 930 {
 931         if (!$W->{"http_safe"}) {
 932                 __PACKAGE__->_no_cache();
 933                 return;
 934                 }
 935
 936         {
 937                 # &Wrequire it here even if it will not be later used; to be stable!
 938                 Wrequire 'My::Hash::RestrictTo';
 939                 my %uri_args_hash=(
 940                         "uri"=>"http://".$W->{"web_hostname"}."/".$W->{"r"}->uri(),
 941                         "args"=>$W->{"args_orig_array"},
 942                         );
 943                 $W->{"uri_args_frozen"}=do { local $Storable::canonical=1; Storable::freeze(\%uri_args_hash); };
 944                 last if !(my $headers_in_keys_arrayref=$uri_args_frozen_to_headers_in_keys{$W->{"uri_args_frozen"}});
 945
 946                 # Protection to be sure we are stable:
 947                 $W->{"headers_in"}=My::Hash::RestrictTo->new($W->{"headers_in"},@$headers_in_keys_arrayref);
 948
 949                 $W->{"uri_args_headers_in_frozen"}=uri_args_headers_in_frozen_get($headers_in_keys_arrayref);
 950                 last if !(my $headers_out_hashref=$uri_args_headers_in_frozen_to_headers_out{$W->{"uri_args_headers_in_frozen"}});
 951                 header(%$headers_out_hashref);
 952                 my $status;
 953                 {
 954                         # &meets_conditions will always deny the attempt if !2xx status().
 955                         # At least ap_read_request() sets: r->status=HTTP_REQUEST_TIME_OUT;     /* Until we get a request */
 956                         my $status_old=$W->{"r"}->status();
 957                         $W->{"r"}->status(HTTP_OK);
 958                         # Update httpd's 'r->mtime' as the header "Last-Modified" is just not enough for ap_meets_conditions():
 959                         # &update_mtime() argument is really in _secs_, not in _msecs_ as the docs claim.
 960                         # Be aware '*1000000' would overflow Perl integer anyway.
 961                         # &set_last_modified would also override the "Last-Modified" headers_out!
 962                         # &mtime may exist but somehow does not work.
 963                         $W->{"r"}->update_mtime(HTTP::Date::str2time($headers_out_hashref->{"Last-Modified"}));
 964                         $status=$W->{"r"}->meets_conditions();
 965                         $W->{"r"}->status($status_old);
 966                         }
 967                 last if OK==$status;
 968                 $W->{"r"}->status($status);
 969                 $W->{"header_only"}=1;  # Inhibit &footer output.
 970                 exit;
 971                 die "NOTREACHED";
 972                 }
 973
 974         $W->{"digest-md5"}=Digest::MD5->new();
 975         $W->{"cache_active"}=1;
 976         $W->{"r"}->add_output_filter(\&cache_output_filter);
 977 }
 978
 979 sub cache_finish_last_modified()
 980 {
 981         cluck "Not yet done now? W __PACKAGE__: ".$W->{"__PACKAGE__"}
 982                         if !$packages_used_hash{$W->{"__PACKAGE__"}}{"_done"};
 983         for my $package_orig (@{$packages_used_array{$W->{"__PACKAGE__"}}}) {
 984                 local $_=$package_orig.".pm";
 985                 s{::}{/}g;
 986                 path_abs_disk "/$_","register"=>1;
 987                 }
 988         my $mtime_newest;
 989         for my $path_abs_disk (keys(%{$W->{"path_abs_disk_register"}})) {
 990                 my $mtime=(stat $path_abs_disk)[9];
 991                 do { cluck "No mtime for: $path_abs_disk"; next; } if !$mtime;
 992                 $mtime_newest=$mtime if !$mtime_newest || $mtime_newest<$mtime;
 993                 }
 994         cluck "No mtime_newest found for the current W __PACKAGE__: ".$W->{"__PACKAGE__"}
 995                         if !$mtime_newest;
 996         return HTTP::Date::time2str($mtime_newest);
 997 }
 998
 999
1000 sub cache_finish()
1001 {
1002         # Do not: return if !$W->{"uri_args_frozen"};
1003         # as we may have just gave 304 and 'exit;' without starting the caching.
1004         return if !$W->{"cache_active"};
1005
1006         # Fill-in/check: %uri_args_frozen_to_headers_in_keys
1007         my $headers_in_keys_stored_arrayref_ref=\$uri_args_frozen_to_headers_in_keys{$W->{"uri_args_frozen"}};
1008         my @headers_in_keys=tied(%{$W->{"headers_in_RecordKeys"}})->accessed();
1009         if (!$$headers_in_keys_stored_arrayref_ref
1010                         || !Data::Compare::Compare(\@headers_in_keys,$$headers_in_keys_stored_arrayref_ref)) {
1011                 cluck "Non-matching generated 'headers_in_keys' per 'uri_args_frozen' key:\n"
1012                                                 .Dumper(\@headers_in_keys,$$headers_in_keys_stored_arrayref_ref)
1013                                 if $$headers_in_keys_stored_arrayref_ref;
1014                 # Build or possibly prevent such further warn dupes:
1015                 $$headers_in_keys_stored_arrayref_ref=\@headers_in_keys;
1016                 # Build or regenerate as obsoleted now:
1017                 $W->{"uri_args_headers_in_frozen"}=uri_args_headers_in_frozen_get(\@headers_in_keys);
1018                 }
1019
1020         # Prepare 'headers_out' for the future reusal:
1021         my %headers_out;
1022         # Do not: $W->{"digest-md5"}->b64digest();
1023         # as it will not provide the trailing filling '='s.
1024         # RFC 1864 is not clear if they should be there but its sample provides them.
1025         # Do not try to provide canonical "\r\n" form of newlines as is said by RFC 1864.
1026         # RFC 2068 (HTTP/1.1) section 14.16 says the newlines should NOT be converted for HTTP.
1027         # ',""' to avoid breaking the headers by its default "\n".
1028         $headers_out{"Content-MD5"}=MIME::Base64::encode_base64($W->{"digest-md5"}->digest(),"");
1029         # In fact we could also use MD5 for ETag as if we know ETag we also know MD5.
1030         # But this way we do not need to calculate MD5 and we still can provide such ETag. So.
1031         # $W->{"r"}->set_etag() ?
1032         $headers_out{"ETag"}='"'.Digest::MD5::md5_base64($W->{"uri_args_headers_in_frozen"}).'"';
1033         # $W->{"r"}->set_content_length() ?
1034         $headers_out{"Content-Length"}=$W->{"r"}->bytes_sent();
1035         my %Vary=map(($_=>1),(@headers_in_keys));
1036         for (keys(%Vary)) {
1037                 next if !/^_/;
1038                 $Vary{"*"}=1;
1039                 delete $Vary{$_};
1040                 }
1041         %Vary=("*"=>1) if $Vary{"*"};
1042         $headers_out{"Vary"}=join(", ",sort keys(%Vary)) if keys(%Vary);
1043         # $W->{"r"}->set_last_modified() ?
1044         $headers_out{"Last-Modified"}=cache_finish_last_modified();
1045
1046         # Fill-in/check: %uri_args_headers_in_frozen_to_headers_out
1047         my $headers_out_stored_hashref_ref=\$uri_args_headers_in_frozen_to_headers_out{$W->{"uri_args_headers_in_frozen"}};
1048         if (!$$headers_out_stored_hashref_ref
1049                         || !Data::Compare::Compare(\%headers_out,$$headers_out_stored_hashref_ref)) {
1050                 cluck "Non-matching generated 'headers_out' per 'uri_args_headers_in_frozen' key:\n"
1051                                                 .Dumper(\%headers_out,$$headers_out_stored_hashref_ref)
1052                                 if $$headers_out_stored_hashref_ref;
1053                 # Build or possibly prevent such further warn dupes:
1054                 $$headers_out_stored_hashref_ref=\%headers_out;
1055                 }
1056
1057 ###print STDERR Dumper(\%uri_args_frozen_to_headers_in_keys,\%uri_args_headers_in_frozen_to_headers_out);
1058 }
1059
1060 sub heading()
1061 {
1062 my($class)=@_;
1063
1064         if (!$W->{"header_only"}) {
1065                 header("Content-Style-Type"=>"text/css");
1066                 header("Content-Script-Type"=>"text/javascript");
1067                 # $W->{"r"}->content_languages() ?
1068                 do { header("Content-Language"=>$_) if $_; } for $W->{"language"};
1069                 }
1070         # TODO: Support also: private
1071         header("Cache-Control"=>"public");      # HTTP/1.1
1072
1073         # Use $W->{"force_charset"}=0 to disable charset.
1074         my $client_charset=$W->{"force_charset"};
1075         $client_charset="us-ascii" if !defined $client_charset;
1076
1077         # Workaround bug
1078         #   https://bugzilla.mozilla.org/show_bug.cgi?id=120556
1079         # of at least
1080         #   Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8b) Gecko/20050217
1081         my $mime=$W->{"content_type"};
1082         # http://validator.w3.org/ does not send ANY "Accept" headers!
1083         $mime="application/xhtml+xml" if !$mime
1084                         && !$W->{"headers_in"}{"Accept"}
1085                         && ($W->{"headers_in"}{"User-Agent"}||"")=~m{^W3C_Validator/}i;
1086         $mime or $mime=$class->Negotiate_choose([
1087                         # Put the fallback variant as the first one.
1088                         # Rate both variants the same to prefer "text/html" for undecided clients.
1089                         # At least
1090                         #   Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8b) Gecko/20050217
1091                         # prefers "application/xhtml+xml" over "text/html" itself:
1092                         #   text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
1093                         negotiate_variant(
1094                                         "id"=>"text/html",
1095                                         "content-type"=>"text/html",
1096                                         "qs"=>0.6,
1097                                         "charset"=>$client_charset,
1098                                         "lang"=>$W->{"language"},
1099                                         ),
1100                         negotiate_variant(
1101                                         "id"=>"application/xhtml+xml",
1102                                         "content-type"=>"application/xhtml+xml",
1103                                         "qs"=>0.6,
1104                                         "charset"=>$client_charset,
1105                                         "lang"=>$W->{"language"},
1106                                         ),
1107                         # application/xml ?
1108                         # text/xml ?
1109                         ]);
1110         # mod_perl doc: If you set this header via the headers_out table directly, it
1111         #               will be ignored by Apache. So do not do that.
1112         my $type=MIME::Types->new()->type($mime) if $client_charset;
1113         cluck "MIME::Types type $mime not known" if $client_charset && !$type;
1114         $client_charset=undef() if $type && !$type->isAscii();
1115         $W->{"r"}->content_type($mime.(!$client_charset ? "" : "; charset=$client_charset"));
1116
1117         cache_start();
1118         # We still can append headers before we put out some text.
1119         # FIXME: It is not clean to still append them without overwriting.
1120         return if $W->{"heading_done"};
1121         Wprint '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n"
1122                         if (!$W->{"header_only"} || $W->{"header_only"} eq "xml") && $mime=~m{^application/\w+[+]xml$};
1123         return if $W->{"header_only"};
1124         # Split 'heading_done' for the proper handling of: /project/Rel.pm
1125         $W->{"heading_done"}++;
1126
1127         Wprint '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
1128         Wprint '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="'.$W->{"language"}.'">'."\n";
1129         my $title=$W->{"title_prefix"}.join("",map({ ': '.$_; } ($W->{"title"} || ())));
1130         # Do not: cluck if $title=~/[<>]/;
1131         # as it is not solved just by: &a_href_inhibit
1132         # as sometimes titles use also: <i>...</i>
1133         $title=~s#<[^>]*>##g;
1134         Wprint "<head>";
1135         Wprint "<title>$title</title>\n";
1136         if ($W->{"have_css"}) {
1137                 # Everything can get overriden later.
1138                 for my $css ("/My/Web.css",@{$W->{"css_push"}}) {
1139                         Wprint <<"HERE";
1140 <link rel="stylesheet" type="text/css" href="@{[ uri_escaped(path_web $css) ]}" />
1141 HERE
1142                         }
1143                 if ($W->{"css_inherit"}) {
1144                         Wprint <<"HERE";
1145 <script type="text/javascript" src="@{[ uri_escaped(path_web('/My/css_inherit.js')) ]}" />
1146 HERE
1147                         }
1148                 }
1149         Wprint '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
1150         Wprint $W->{"head"};
1151         for my $type (qw(prev next index contents start up)) {
1152                 do { Wprint '<link rel="'.$type.'" href="'.uri_escaped(path_web $_).'" />'."\n" if $_; }
1153                                 for ($W->{"rel_$type"});
1154                 }
1155         Wprint "</head><body";
1156 #       Wprint ' bgcolor="black" text="white" link="aqua" vlink="teal"'
1157 #                       if $W->{"browser"}->netscape() && (!$W->{"browser"}->major() || $W->{"browser"}->major()<=4);
1158         Wprint $W->{"body_attr"};
1159         Wprint ">\n";
1160
1161         do { Wprint $_ if $_; } for $W->{"heading"};
1162 }
1163
1164 BEGIN {
1165         delete $W->{"__My::Web_init"};
1166         }
1167
1168 1;