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    1: # The LearningOnline Network with CAPA
    2: # Server for RAT Maps
    3: #
    4: # (Edit Handler for RAT Maps
    5: # (TeX Content Handler
    6: #
    7: # 05/29/00,05/30 Gerd Kortemeyer)
    8: # 7/1 Gerd Kortemeyer)
    9: # 7/1,7/3,7/4,7/7,7/8,7/10,7/26,10/2 Gerd Kortemeyer
   10: 
   11: package Apache::lonratsrv;
   12: 
   13: use strict;
   14: use Apache::Constants qw(:common);
   15: use Apache::File;
   16: use HTML::TokeParser;
   17: 
   18: 
   19: # ------------------------------------------------------------- From RAT to XML
   20: 
   21: sub qtescape {
   22:     my $str=shift;
   23:     $str=~s/\&\#58\;/\:/g;
   24:     $str=~s/\&\#39\;/\'/g;
   25:     $str=~s/\&\#44\;/\,/g;
   26:     $str=~s/\"/\&\#34\;/g;
   27:     return $str;
   28: }
   29: 
   30: # ------------------------------------------------------------- From XML to RAT
   31: 
   32: sub qtunescape {
   33:     my $str=shift;
   34:     $str=~s/\:/\&\#58\;/g;
   35:     $str=~s/\'/\&\#39\;/g;
   36:     $str=~s/\,/\&\#44\;/g;
   37:     $str=~s/\"/\&\#34\;/g;
   38:     return $str;
   39: }
   40: 
   41: # --------------------------------------------------------- Loads map from disk
   42: 
   43: sub loadmap {
   44:     my ($fn,$errtext)=@_;
   45:     my $outstr='';
   46:     my @content=();
   47:     my @obj=();
   48:     my @links=();
   49:     if (-e $fn) {
   50:         {
   51: 	    my $fh=Apache::File->new($fn);
   52:             @content=<$fh>;
   53:         }
   54:         my $instr=join('',@content);
   55:         my $parser = HTML::TokeParser->new(\$instr);
   56:         my $token;
   57:         my $graphmode=0;
   58: 
   59:         $fn=~/\.(\w+)$/;
   60:         $outstr="mode<:>$1";
   61: 
   62:         while ($token = $parser->get_token) {
   63: 	    if ($token->[0] eq 'S') {
   64:                 if ($token->[1] eq 'map') {
   65: 		    $graphmode=($token->[2]->{'mode'} eq 'rat/graphical');
   66:                 } elsif ($token->[1] eq 'resource') {
   67: # -------------------------------------------------------------------- Resource
   68:                     $outstr.='<&>objcont';
   69:                     if ($token->[2]->{'id'}) {
   70: 			$outstr.='<:>'.$token->[2]->{'id'};
   71:                         if ($obj[$token->[2]->{'id'}]==1) {
   72:                            $errtext.='Error: multiple use of ID '.
   73:                                      $token->[2]->{'id'}.'. ';
   74:                         }
   75:                         $obj[$token->[2]->{'id'}]=1; 
   76:                     } else {
   77:                         my $i=1;
   78:                         while (($i<=$#obj) && ($obj[$i]!=0)) { $i++; }
   79:                         $outstr.='<:>'.$i;
   80:                         $obj[$i]=1;
   81:                     }
   82:                     $outstr.='<:>';
   83:                     $outstr.=qtunescape($token->[2]->{'title'}).":";
   84:                     $outstr.=qtunescape($token->[2]->{'src'}).":";
   85:                     if ($token->[2]->{'src'}=~/\/\//) {
   86:                         $outstr.='true:';
   87:                     } else {
   88:                         $outstr.='false:';
   89:                     }
   90:                     if ($token->[2]->{'type'}) {
   91: 			$outstr.=$token->[2]->{'type'}.':';
   92:                     }  else {
   93:                         $outstr.='normal:';
   94:                     }
   95:                     $outstr.='res';
   96:                 } elsif ($token->[1] eq 'condition') {
   97: # ------------------------------------------------------------------- Condition
   98:                     $outstr.='<&>objcont';
   99:                     if ($token->[2]->{'id'}) {
  100: 			$outstr.='<:>'.$token->[2]->{'id'};
  101:                         if ($obj[$token->[2]->{'id'}]==1) {
  102:                            $errtext.='Error: multiple use of ID '.
  103:                                      $token->[2]->{'id'}.'. ';
  104:                         }
  105:                         $obj[$token->[2]->{'id'}]=1; 
  106:                     } else {
  107:                         my $i=1;
  108:                         while (($i<=$#obj) && ($obj[$i]!=0)) { $i++; }
  109:                         $outstr.='<:>'.$i;
  110:                         $obj[$i]=1;
  111:                     }
  112:                     $outstr.='<:>';
  113:                     $outstr.=qtunescape($token->[2]->{'value'}).':';
  114:                     if ($token->[2]->{'type'}) {
  115: 			$outstr.=$token->[2]->{'type'}.':';
  116:                     } else {
  117:                         $outstr.='normal:';
  118:                     }
  119:                     $outstr.='cond';
  120:                 } elsif ($token->[1] eq 'link') {
  121: # ----------------------------------------------------------------------- Links
  122:                     $outstr.='<&>objlinks';
  123: 
  124:                         if ($token->[2]->{'index'}) {
  125: 			   if ($links[$token->[2]->{'index'}]) {
  126:                                $errtext.='Error: multiple use of link index '.
  127: 			       $token->[2]->{'index'}.'. ';
  128:                            }
  129: 			   $outstr.='<:>'.$token->[2]->{'index'};
  130:                            $links[$token->[2]->{'index'}]=1;
  131:                         } else {
  132:                            my $i=1;
  133:                            while (($i<=$#links) && ($links[$i]==1)) { $i++; }
  134:                            $outstr.='<:>'.$i;
  135:                            $links[$i]=1;
  136: 		       }
  137: 		    
  138:                     $outstr.='<:>'.$token->[2]->{'from'}.
  139:                              ':'.$token->[2]->{'to'};
  140:                     if ($token->[2]->{'condition'}) {
  141: 			$outstr.=':'.$token->[2]->{'condition'};
  142:                     } else {
  143:  			$outstr.=':0';
  144:                     }
  145:                 } elsif ($graphmode) {
  146: # --------------------------------------------- All other tags (graphical only)
  147:                     $outstr.='<&>'.$token->[1];
  148:                     if (defined($token->[2]->{'index'})) {
  149: 			$outstr.='<:>'.$token->[2]->{'index'};
  150:                         if ($token->[1] eq 'obj') {
  151: 			    $obj[$token->[2]->{'index'}]=2;
  152:                         }
  153:                     }
  154:                     $outstr.='<:>'.$token->[2]->{'value'};
  155:                 }
  156:             }
  157:         }
  158: 
  159:     } else {
  160:         $errtext.='Map not loaded: The file does not exist. ';
  161:     }
  162:     return($outstr,$errtext);
  163: }
  164: 
  165: 
  166: # ----------------------------------------------------------- Saves map to disk
  167: 
  168: sub savemap {
  169:     my ($fn,$errtext)=@_;
  170:     if (($fn=~/\.sequence$/) ||
  171:         ($fn=~/\.page$/)) {
  172: 
  173: # ------------------------------------------------------------- Deal with input
  174:         my @tags=split(/<&>/,$ENV{'form.output'});
  175:         my $outstr='';
  176:         my $graphdef=0;
  177:         if ($tags[0] eq 'graphdef<:>yes') {
  178: 	    $outstr='<map mode="rat/graphical">'."\n";
  179:             $graphdef=1;
  180:         } else {
  181:             $outstr="<map>\n";
  182:         }
  183:         map {
  184: 	   my @parts=split(/<:>/,$_);
  185:            if ($parts[0] eq 'objcont') {
  186:                my @comp=split(/:/,$parts[$#parts]);
  187: # --------------------------------------------------------------- Logical input
  188: 	       if ($comp[$#comp] eq 'res') {
  189:                    $comp[0]=qtescape($comp[0]);
  190:                    $comp[1]=qtescape($comp[1]);
  191:                    if ($comp[2] eq 'true') {
  192: 		       if ($comp[1]!~/^http\:\/\//) {
  193: 			   $comp[1]='http://'.$comp[1];
  194:                        }
  195:                    } else {
  196: 		       if ($comp[1]=~/^http\:\/\//) {
  197: 			   $comp[1]=~s/^http\:\/\/[^\/]*\//\//;
  198:                        }
  199:                    }
  200: 		   $outstr.='<resource id="'.$parts[1].'" src="'
  201:                           .$comp[1].'"';
  202: 
  203:                    if (($comp[3] ne '') && ($comp[3] ne 'normal')) {
  204: 		       $outstr.=' type="'.$comp[3].'"';
  205:                    }
  206:                    if ($comp[0] ne '') {
  207: 		       $outstr.=' title="'.$comp[0].'"';
  208:                    }
  209:                    $outstr.="></resource>\n";
  210:                } elsif ($comp[$#comp] eq 'cond') {
  211:                    $outstr.='<condition id="'.$parts[1].'"';
  212:                    if (($comp[1] ne '') && ($comp[1] ne 'normal')) {
  213: 		       $outstr.=' type="'.$comp[1].'"';
  214:                    }
  215:                    $outstr.=' value="'.qtescape($comp[0]).'"';
  216:                    $outstr.="></condition>\n";
  217:                }
  218:            } elsif ($parts[0] eq 'objlinks') {
  219:                my @comp=split(/:/,$parts[$#parts]);
  220:                $outstr.='<link';
  221:                $outstr.=' from="'.$comp[0].'"';
  222:                $outstr.=' to="'.$comp[1].'"';
  223:                if (($comp[2] ne '') && ($comp[2]!=0)) {
  224:                   $outstr.=' condition="'.$comp[2].'"';
  225:                }
  226:                $outstr.=' index="'.$parts[1].'"';
  227:                $outstr.="></link>\n";
  228:            } elsif (($parts[0] ne '') && ($graphdef)) {
  229: # ------------------------------------------------------------- Graphical input
  230:                $outstr.='<'.$parts[0];
  231:                if ($#parts==2) {
  232: 		   $outstr.=' index="'.$parts[1].'"';
  233:                }
  234:                $outstr.=' value="'.qtescape($parts[$#parts]).'"></'.
  235:                         $parts[0].">\n";
  236:            }
  237:         } @tags;
  238:         $outstr.="</map>\n";
  239:         {
  240:           my $fh;
  241:           if ($fh=Apache::File->new(">$fn")) {
  242:              print $fh $outstr;
  243:              $errtext.="Map saved as $fn. ";
  244: 	  } else {
  245:              $errtext.='Could not write file $fn. Map not saved. ';
  246: 	  }
  247:         }
  248:     } else {
  249: # -------------------------------------------- Cannot write to that file, error
  250:         $errtext.='Map not saved: The specified path does not exist. ';
  251:     }
  252:     return $errtext;
  253: }
  254: 
  255: # ================================================================ Main Handler
  256: 
  257: sub handler {
  258:   my $r=shift;
  259:   $r->content_type('text/html');
  260:   $r->send_http_header;
  261: 
  262:   return OK if $r->header_only;
  263: 
  264:   my $url=$r->uri;
  265:   $url=~/\/(\w+)\/ratserver$/;
  266:   my $mode=$1;
  267: 
  268:   $url=~s/\/loadonly\/ratserver$/\/save\/ratserver/;
  269:   
  270:   my $fn=$r->filename;
  271:   my $errtext='';
  272:   my $outtext='';
  273:   my $onload='';
  274: 
  275:   if ($mode ne 'loadonly') {
  276:      $errtext=&savemap($fn,$errtext);
  277:      $onload='onLoad="parent.code.srvloaded();"';
  278:   }
  279:   ($outtext,$errtext)=&loadmap($fn,$errtext);
  280: 
  281:   $r->print(<<ENDDOCUMENT);
  282: <html>
  283: <body bgcolor="#FFFFFF" $onload>
  284: <form name=storage method=post action="$url">
  285: <input type=hidden name=output value="$outtext">
  286: </form>
  287: ENDDOCUMENT
  288:     if ($errtext ne '') {
  289: 	$r->print(<<ENDSCRIPT);
  290: <script>
  291:     alert("$errtext");
  292: </script>
  293: ENDSCRIPT
  294:     }
  295:     $r->print("</body>\n</html>\n");
  296: 
  297:   return OK;
  298: }
  299: 
  300: 1;
  301: __END__
  302: 
  303: 
  304: 
  305: 
  306: 
  307: 
  308: