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 our @EXPORT=qw(&require &a_href &a_href_cz &vskip &img $W);
  28 our @ISA=qw(Exporter);
  29
  30 use WebConfig;  # for %WebConfig
  31 require CGI;    # for &escapeHTML
  32 require Image::Size;    # for &imgsize
  33 use File::Basename;     # &basename
  34 use Carp qw(cluck confess);
  35 use URI::Escape;
  36 require HTTP::BrowserDetect;
  37 require HTTP::Negotiate;
  38 require Geo::IP;
  39 require CGI;
  40
  41
  42 # Undo 'www/engine/httpd-restart' as it may use obsolete Perl for 'mod_perl'
  43 delete $ENV{"PERLLIB"};
  44 delete $ENV{"LD_LIBRARY_PATH"};
  45
  46
  47 our $W;
  48                 # $W->{"title"}
  49                 # $W->{"head"}
  50                 # $W->{"head_css"}
  51                 # $W->{"force_charset"}
  52                 # %{$W->{"packages_used"}
  53                 # $W->{"heading_done"}
  54                 # $W->{"footer_passed"}
  55                 # %{$W->{"headers"}}
  56                 # %{$W->{"headers_lc"}} # maps lc($headers_key)=>$headers_key
  57                 # @{$W->{"packages_used"}{$Apache::Registry::curstash}}}
  58                 # %{$W->{"args"}}
  59
  60 sub init ($%)
  61 {
  62 my($class,%args)=@_;
  63
  64         $W={ %WebConfig,%args };        # override %WebConfig settings
  65
  66         $W->{"__PACKAGE__"}||="Apache::ROOT".$Apache::Registry::curstash;
  67
  68         $W->{"top_dir"}||=eval '$'.$W->{"__PACKAGE__"}.'::top_dir';
  69
  70         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_ent");
  71         do { $W->{$_}=0  if !defined $W->{$_}; } for ("detect_js");
  72         do { $W->{$_}=1  if !defined $W->{$_}; } for ("have_css");      # AFAIK it does not hurt anyone.
  73         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer");
  74         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_delimit");
  75         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_mailme");
  76         do { $W->{$_}=1  if !defined $W->{$_}; } for ("footer_ids");
  77         do { $W->{$_}=1  if !defined $W->{$_}; } for ("indexme");
  78         do { $W->{$_}="" if !defined $W->{$_}; } for ("head");
  79         do { $W->{$_}="" if !defined $W->{$_}; } for ("head_css");
  80
  81         my $footer_any=0;
  82         for (qw(footer_mailme footer_ids)) {
  83                 $W->{$_}=0 if !$W->{"footer"};
  84                 $footer_any=1 if $W->{$_};
  85                 }
  86         $W->{"footer"}=0 if !$footer_any;
  87         $W->{"footer_delimit"}=0 if !$W->{"footer"};
  88
  89         $W->{"r"}=Apache->request();
  90
  91         $W->{"QUERY_STRING"}=$W->{"r"}->args() || "";
  92            if ($W->{"QUERY_STRING"}=~/[&]amp;have_ent/)
  93                 { $W->{"have_ent"}=0; }
  94         elsif ($W->{"QUERY_STRING"}=~    /[&]have_ent/)
  95                 { $W->{"have_ent"}=1; }
  96         else
  97                 { delete $W->{"have_ent"}; }
  98         if ($W->{"detect_ent"} && !defined $W->{"have_ent"} && $W->{"r"}->method() eq "GET") {
  99                 $W->{"head"}.='<meta http-equiv="Refresh" content="0; URL='
 100                                 .CGI::escapeHTML("http://".$W->{"r"}->hostname()."/".($W->{"r"}->uri()=~m#^/*(.*)$#)[0]
 101                                                 ."?".($W->{"QUERY_STRING"} || "detect_ent_glue=1").'&have_ent=detect')
 102                                 .'" />'."\n";
 103                 }
 104         $W->{"QUERY_STRING"}=~s/([&])amp;/$1/g;
 105         $W->{"r"}->args($W->{"QUERY_STRING"});
 106         $ENV{"QUERY_STRING"}=$W->{"QUERY_STRING"};
 107         # Do not: $W->{"r"}->args()
 108         # as it  parses only QUERY_STRING (not POST data).
 109         $W->{"args"}={ CGI->new()->Vars() };
 110
 111         do { $W->{$_}=$ENV{"HTTP_ACCEPT"} if !defined $W->{$_}; } for ("accept");
 112         do { $W->{$_}=$ENV{"HTTP_USER_AGENT"} if !defined $W->{$_}; } for ("user_agent");
 113
 114         $W->{"browser"}=HTTP::BrowserDetect->new($W->{"user_agent"});
 115
 116         if (!defined $W->{"have_style"}) {
 117                 $W->{"have_style"}=(!$W->{"browser"}->netscape() || $W->{"browser"}->major>4 ? 1 : 0);
 118                 }
 119
 120         $W->{"have_js"}=($W->{"args"}{"have_js"} ? 1 : 0);
 121         if ($W->{"detect_js"} && !$W->{"have_js"}) {
 122                 $W->{"head"}.='<script type="text/javascript" src="'.$W->{"top_dir"}.'/have_js.js.pl"></script>'."\n";
 123                 }
 124
 125         do { args_check(%$_) if $_; } for ($W->{"args_check"});
 126
 127         return $W;
 128 }
 129
 130 sub require ($)
 131 {
 132 my($file)=@_;
 133
 134         $file=~s#/#::#g;
 135         $file=~s/[.]pm$//;
 136         my $class=$file;
 137         $file=~s#::#/#g;
 138         $file.=".pm";
 139         my $aref=($W->{"packages_used"}{$Apache::Registry::curstash}||=[]);
 140         push @$aref,$class
 141                         if !{ map(($_=>1),@$aref) }->{$class};  # Prevent duplicated entries.
 142         CORE::require $file;
 143         1;      # Otherwise 'require' would already file above.
 144 }
 145
 146 sub fatal (;$);
 147
 148 sub args_check (%)
 149 {
 150 my(%tmpl)=@_;
 151
 152         while (my($name,$regex)=each(%tmpl)) {
 153                 my $name_html="Parametr <span class=\"quote\">".CGI::escapeHTML($name)."</span>";
 154                 my $val=$W->{"args"}{$name};
 155                 fatal "$name_html <span class=\"quote\">".CGI::escapeHTML($val)."</span>"
 156                                                 ." does not match required regex <span class=\"quote\">".CGI::escapeHTML($regex)."</span>"
 157                                 if defined $val && $val!~/$regex/;
 158                 fatal "$name_html is required"
 159                                 if !defined $val;
 160                 }
 161 }
 162
 163 sub vskip (;$)
 164 {
 165 my($height)=@_;
 166
 167         return '<p'.(!defined $height ? "" : ' style="height: '.$height.';"').'>&nbsp;</p>'."\n";
 168 }
 169
 170 sub fatal (;$)
 171 {
 172 my($msg)=@_;
 173
 174         $msg="UNKNOWN" if !$msg;
 175
 176 #       heading(false/*title*/,false/*indexme*/);       # notitle is always safe, don't index the error message
 177         print "\n".vskip("3ex")."<hr /><h1 class=\"error\">FATAL ERROR: $msg!</h1>\n"
 178                         ."<p>You can report this problem's details to"
 179                         ." ".a_href("mailto:".$W->{"admin_mail"},"admin of this website").".</p>\n";
 180         footer();
 181 }
 182
 183 sub footer (;$)
 184 {
 185         exit 1 if $W->{"footer_passed"}++;      # deadlock prevention:
 186
 187         print vskip if $W->{"footer_delimit"};
 188
 189         print "<hr />\n" if $W->{"footer"};
 190
 191         if ($W->{"footer_mailme"}) {
 192                 print '<form action="'.$W->{"top_dir"}.'/SendMsg.pl" method="post" onsubmit="'
 193                                 ."this.elements['msgscript'].value=this.elements['msghtml'].value;"
 194                                 ."this.elements['msghtml'].value='';"
 195                                 ."this.submit();"
 196                                 .'">'."\n";
 197                         print '<p align="right">'."\n";
 198                                 print '<input name="msgscript" type="hidden" />'."\n";
 199                                 print '<input name="msghtml" type="text" size="32" alt="Message" />'."\n";
 200                                 print '<input name="submit" type="submit" value="Quick Note" />'."\n";
 201                         print '</p>'."\n";
 202                 print '</form>'."\n";
 203                 }
 204
 205         if ($W->{"footer_ids"}) {
 206                 print '<p class="cvs-id">';
 207                 print join("<br />\n",map({ my $package=$_;
 208                         my $cvs_id=(eval('$'.$package."::CVS_ID")
 209 #                                       || $package     # debug
 210                                         );
 211                         if (!$cvs_id) {
 212                                 ();
 213                                 }
 214                         else {
 215                                 $cvs_id='$'.$cvs_id.'$';        # Eaten by 'q' operator.
 216                                 my @cvs_id_split=split / +/,$cvs_id;
 217                                 if (@cvs_id_split==8) {
 218                                         my $file=$package;
 219                                         $file=~s#::#/#g;
 220                                         my $ext;
 221                                         for (qw(.html.pl .pl .pm),"") {
 222                                                 $ext=$_;
 223                                                 last if -r $W->{"top_dir"}."/$file$ext";
 224                                                 cluck "Class file $file not found" if !$ext;
 225                                                 }
 226                                         $file.=$ext;
 227                                         $cvs_id_split[2]=""
 228                                                         .a_href((map({ my $s=$_; $s=~s#/viewcvs/#$&~checkout~/#; $s; } $W->{"viewcvs"}))[0]."$file?rev=".$cvs_id_split[2],
 229                                                                         $cvs_id_split[2]);
 230                                         $cvs_id_split[1]=a_href($W->{"viewcvs"}.$file,
 231                                                         ($package!~/^Apache::/ ? $package : $cvs_id_split[1]));
 232                                         $cvs_id_split[5]=&{$W->{"cvs_id_author"}}($cvs_id_split[5]);
 233                                         }
 234                                 join " ",@cvs_id_split;
 235                                 }
 236                         } (
 237                                         $W->{"__PACKAGE__"},
 238                                         __PACKAGE__,
 239                                         "WebConfig",
 240                                         @{$W->{"packages_used"}{$Apache::Registry::curstash}},
 241                                         )));
 242                 print "</p>\n";
 243                 }
 244         print "</body></html>\n";
 245         exit(0);
 246 }
 247
 248 sub header (%)
 249 {
 250 my(%pairs)=@_;
 251
 252         while (my($key,$val)=each(%pairs)) {
 253                 do { cluck "Headers already sent"; next; } if $W->{"heading_done"};
 254                 for ($W->{"headers_lc"}{lc $key} || ()) {
 255                         delete $W->{"headers"}{$_};
 256                         }
 257                 $W->{"headers_lc"}{lc $key}=$key;
 258                 $W->{"headers"}{$key}=$val;
 259                 }
 260 }
 261
 262 sub size_display ($)
 263 {
 264 my($size)=@_;
 265
 266            if ($size<4096)
 267                 {}
 268         elsif ($size<1024*1024)
 269                 { $size=sprintf "%.1fK",$size/1024; }
 270         else
 271                 { $size=sprintf "%.1fM",$size/1024/1024; }
 272         $size.="B";
 273         return $size;
 274 }
 275
 276 sub url_is_local ($)
 277 {
 278 my($url)=@_;
 279
 280         return $url!~m#^[a-z]+://#;
 281 }
 282
 283 sub a_href ($;$%)
 284 {
 285 my($url,$contents,%args)=@_;
 286
 287         do { $$_=1 if !defined $$_; } for (\$args{"size"});
 288         $contents=CGI::escapeHTML($url) if !defined $contents;
 289
 290         my $r='<a href="';
 291         my $urlent=CGI::escapeHTML($url);
 292            if ($url eq $urlent)
 293                 { $r.=$url; }
 294         elsif (url_is_local $url)
 295                 { $r.=$urlent; }
 296         elsif (defined $W->{"have_ent"} && !$W->{"have_ent"})   # non-ent client
 297                 { $r.=$url; }
 298         elsif ($W->{"have_ent"})        # ent client
 299                 { $r.=$urlent; }
 300         else    # unknown client, &CGI::escapeHTML should not be needed here
 301                 { $r.=CGI::escapeHTML($W->{"top_dir"}."/Redirect.pl?location=".uri_escape($url)); }
 302         $r.='">'.$contents.'</a>';
 303         if ($args{"size"} && url_is_local($url) && $url=~/[.](?:gz|Z|rpm|zip|deb|lha)/) {       # Downloadable?
 304                 if (!-r $url)
 305                         { cluck "File not readable: $url"; }
 306                 else {
 307                         $r.='&nbsp;('.size_display((stat($url))[7]).')';
 308                         }
 309                 }
 310         return $r;
 311 }
 312
 313 sub remote_ip ()
 314 {
 315         # Do not: PerlModule                 Apache::ForwardedFor
 316         #         PerlPostReadRequestHandler Apache::ForwardedFor
 317         # As 'Apache::ForwardedFor' takes the first of $ENV{"HTTP_X_FORWARDED_FOR"}
 318         # while the contents is '127.0.0.1, 213.220.195.171' if client has its own proxy.
 319         # We must take the last item ourselves.
 320         my $r=$ENV{"HTTP_X_FORWARDED_FOR"} || $W->{"r"}->get_remote_host();
 321         $r=~s/^.*,\s*//;
 322         return $r;
 323 }
 324
 325 sub is_cz ()
 326 {
 327         return "CZ" eq Geo::IP->new()->country_code_by_addr(remote_ip());
 328 }
 329
 330 sub a_href_cz ($$;%)
 331 {
 332 my($url,$contents,%args)=@_;
 333
 334         return a_href $url,$contents,%args if is_cz();
 335         return $contents;
 336 }
 337
 338 sub img_size ($$)
 339 {
 340 my($width,$height)=@_;
 341
 342         return ($W->{"have_style"} ? "style=\"border:0;width:${width}px;height:${height}px\"" : "border=\"0\"")
 343                         ." width=\"$width\" height=\"$height\"";
 344 }
 345
 346 sub negotiate_variant (%)
 347 {
 348 my(%args)=@_;
 349
 350         my @fields=("id","qs","content-type","encoding","charset","lang","size");
 351         return [ map(($args{$_}),@fields) ];
 352 }
 353
 354 my @img_variants=(
 355                 { "id"=>"png","qs"=>1.0,"content-type"=>"image/png" },
 356                 { "id"=>"gif","qs"=>0.9,"content-type"=>"image/gif" },
 357                 );
 358 my $img_variants_re='[.](?:'.join('|',map(($_->{"id"}),@img_variants)).')$';
 359
 360 sub img_src ($)
 361 {
 362 my($file_base)=@_;
 363
 364         return $file_base if !url_is_local($file_base)
 365                         # Known image extension?
 366                         || $file_base=~m#$img_variants_re#o;
 367
 368         my @nego_variants;
 369         for my $var (@img_variants) {
 370                 my $file=$file_base.".".$var->{"id"};
 371                 # TODO: Somehow quickly check dependencies?
 372                 system 'make >&2 -s --no-print-directory'
 373                                                 .' -C '."'".File::Basename::dirname($file)."' '".File::Basename::basename($file)."'"
 374                                 if !-f $file;
 375                 push @nego_variants,negotiate_variant(
 376                                 %$var,
 377                                 "size"=>(stat $file)[7],
 378                                 );
 379                 }
 380         # Do not: ,$W->{"r"});
 381         # but should we provide somehow either 'HTTP::Headers' or 'HTTP::Request' ?
 382         my $ext=HTTP::Negotiate::choose(\@nego_variants);
 383         $ext||=$img_variants[0]->{"id"};        # &HTTP::Negotiate::choose failed?
 384         return $file_base.".".$ext;
 385 }
 386
 387 sub img ($$;$)
 388 {
 389 my($file_base,$alt,$attrs)=@_;
 390
 391         my $file=img_src $file_base;
 392         my($width,$height)=Image::Size::imgsize($file);
 393         $alt=CGI::escapeHTML($alt);
 394         return "<img src=\"$file\" alt=\"$alt\" title=\"$alt\" ".img_size($width,$height)
 395                         .(!$attrs ? "" : " ".$attrs)." />";
 396 }
 397
 398 sub readfile ($$)
 399 {
 400 my($class,$filename)=@_;
 401
 402         local *F;
 403         open F,$filename or die "Cannot open \"$filename\": $!";
 404         local $/=undef();
 405         my $data=<F>;
 406         close F;
 407         return $data;
 408 }
 409
 410 sub arr_keys (@)
 411 {
 412 my(@arr)=@_;
 413
 414         my @r=();
 415         while (@arr) {
 416                 push @r,shift @arr;     # key
 417                 shift @arr;     # val
 418                 }
 419         return @r;
 420 }
 421
 422 sub heading ()
 423 {
 424 my($class)=@_;
 425
 426         # $ENV{"CLIENT_CHARSET"} ignored (mod_czech support dropped!)
 427         my $client_charset=$W->{"force_charset"} || "us-ascii";
 428         header("Content-Style-Type"=>"text/css");
 429         header("Content-Script-Type"=>"text/javascript");
 430
 431         while (my($key,$val)=each(%{$W->{"headers"}})) {
 432                 $W->{"r"}->header_out($key,$val);
 433                 }
 434         $W->{"r"}->send_http_header("text/html; charset=$client_charset");      # "Content-type"; do not use header()
 435
 436         return if $W->{"heading_done"}++;
 437         exit if $W->{"r"}->header_only();
 438
 439         if (1) { # || !$msie_major || $msie_major>=4) # TODO:dyn
 440                 print '<?xml version="1.0" encoding="'.$client_charset.'"?>'."\n";
 441                 }
 442         print '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'."\n";
 443         print '<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">'."\n";
 444         print '<head><title>'.CGI::escapeHTML($W->{"title_prefix"})
 445                         .join("",map({ ': '.CGI::escapeHTML($_); } ($W->{"title"} || ())))
 446                         .'</title>'."\n";
 447
 448         if ($W->{"have_css"}) {
 449                 print <<'HERE';
 450 <style type="text/css"><!--
 451 .cvs-id   { font-family: monospace; }
 452 .error    { color: red;   background-color: transparent; }
 453 .quote    { font-family: monospace; }
 454 .nowrap   { white-space: nowrap; }
 455 .centered { text-align: center; }
 456 .tab-bold { font-weight: bold; }
 457 .tab-head { font-weight: bold; color: yellow; background-color: transparent; }
 458 body {
 459                 background-color: black;
 460                 color: white;
 461                 }
 462 :link    { color: aqua;   background-color: transparent; }
 463 :visited { color: teal;   background-color: transparent; }
 464 h1,h2    { color: yellow; background-color: transparent; }
 465 td       { padding: 2px; }
 466 caption  { caption-side: bottom; }
 467 .footer img { vertical-align: middle; }
 468 HERE
 469                 print $W->{"head_css"}."\n";
 470                 print "--></style>\n";
 471                 }
 472
 473         print '<meta name="robots" content="'.($W->{"indexme"} ? "" : "no" ).'index,follow" />'."\n";
 474         print $W->{"head"};
 475         print "</head><body";
 476         print ' bgcolor="black" text="white" link="aqua" vlink="teal"'
 477                         if $W->{"browser"}->netscape() && $W->{"browser"}->major<=4;
 478         print ">\n";
 479 }
 480
 481 1;