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Bug #2942: no early outs. $errtext is not just for errors (sorry, not named
very well), but for any message to the user, including "Map saved as ..."

I don't think taking out this line hurts, since &loadmap will deliver empty
string anyway if loading fails.

    1: # The LearningOnline Network with CAPA
    2: # Server for RAT Maps
    3: #
    4: # $Id: lonratsrv.pm,v 1.27 2004/04/23 17:30:33 www Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: 
   29: 
   30: package Apache::lonratsrv;
   31: 
   32: use strict;
   33: use Apache::Constants qw(:common);
   34: use Apache::File;
   35: use HTML::TokeParser;
   36: 
   37: 
   38: # ------------------------------------------------------------- From RAT to XML
   39: 
   40: sub qtescape {
   41:     my $str=shift;
   42:     $str=~s/\&\#58\;/\:/g;
   43:     $str=~s/\&\#39\;/\'/g;
   44:     $str=~s/\&\#44\;/\,/g;
   45:     $str=~s/\"/\&\#34\;/g;
   46:     return $str;
   47: }
   48: 
   49: # ------------------------------------------------------------- From XML to RAT
   50: 
   51: sub qtunescape {
   52:     my $str=shift;
   53:     $str=~s/\:/\&colon\;/g;
   54:     $str=~s/\'/\&\#39\;/g;
   55:     $str=~s/\,/\&\#44\;/g;
   56:     $str=~s/\"/\&\#34\;/g;
   57:     return $str;
   58: }
   59: 
   60: # --------------------------------------------------------- Loads map from disk
   61: 
   62: sub loadmap {
   63:     my ($fn,$errtext)=@_;
   64:     my $outstr='';
   65:     my @obj=();
   66:     my @links=();
   67:     my $instr='';
   68:     if ($fn=~/^\/*uploaded\//) {
   69:         $instr=&Apache::lonnet::getfile($fn);
   70:     } elsif (-e $fn) {
   71:         my @content=();
   72:         {
   73: 	    my $fh=Apache::File->new($fn);
   74:             @content=<$fh>;
   75:         }
   76:         $instr=join('',@content);
   77:     }
   78:     if ($instr eq -2) {
   79:         $errtext.='Map not loaded: An error occured while trying to load the map.';
   80:     } elsif ($instr) {
   81:         my $parser = HTML::TokeParser->new(\$instr);
   82:         my $token;
   83:         my $graphmode=0;
   84: 
   85:         $fn=~/\.(\w+)$/;
   86:         $outstr="mode<:>$1";
   87: 
   88:         while ($token = $parser->get_token) {
   89: 	    if ($token->[0] eq 'S') {
   90:                 if ($token->[1] eq 'map') {
   91: 		    $graphmode=($token->[2]->{'mode'} eq 'rat/graphical');
   92:                 } elsif ($token->[1] eq 'resource') {
   93: # -------------------------------------------------------------------- Resource
   94:                     $outstr.='<&>objcont';
   95:                     if ($token->[2]->{'id'}) {
   96: 			$outstr.='<:>'.$token->[2]->{'id'};
   97:                         if ($obj[$token->[2]->{'id'}]==1) {
   98:                            $errtext.='Error: multiple use of ID '.
   99:                                      $token->[2]->{'id'}.'. ';
  100:                         }
  101:                         $obj[$token->[2]->{'id'}]=1; 
  102:                     } else {
  103:                         my $i=1;
  104:                         while (($i<=$#obj) && ($obj[$i]!=0)) { $i++; }
  105:                         $outstr.='<:>'.$i;
  106:                         $obj[$i]=1;
  107:                     }
  108:                     $outstr.='<:>';
  109:                     $outstr.=qtunescape($token->[2]->{'title'}).":";
  110:                     $outstr.=qtunescape($token->[2]->{'src'}).":";
  111:                     if ($token->[2]->{'external'} eq 'true') {
  112:                         $outstr.='true:';
  113:                     } else {
  114:                         $outstr.='false:';
  115:                     }
  116:                     if ($token->[2]->{'type'}) {
  117: 			$outstr.=$token->[2]->{'type'}.':';
  118:                     }  else {
  119:                         $outstr.='normal:';
  120:                     }
  121:                     $outstr.='res';
  122:                 } elsif ($token->[1] eq 'condition') {
  123: # ------------------------------------------------------------------- Condition
  124:                     $outstr.='<&>objcont';
  125:                     if ($token->[2]->{'id'}) {
  126: 			$outstr.='<:>'.$token->[2]->{'id'};
  127:                         if ($obj[$token->[2]->{'id'}]==1) {
  128:                            $errtext.='Error: multiple use of ID '.
  129:                                      $token->[2]->{'id'}.'. ';
  130:                         }
  131:                         $obj[$token->[2]->{'id'}]=1; 
  132:                     } else {
  133:                         my $i=1;
  134:                         while (($i<=$#obj) && ($obj[$i]!=0)) { $i++; }
  135:                         $outstr.='<:>'.$i;
  136:                         $obj[$i]=1;
  137:                     }
  138:                     $outstr.='<:>';
  139:                     $outstr.=qtunescape($token->[2]->{'value'}).':';
  140:                     if ($token->[2]->{'type'}) {
  141: 			$outstr.=$token->[2]->{'type'}.':';
  142:                     } else {
  143:                         $outstr.='normal:';
  144:                     }
  145:                     $outstr.='cond';
  146:                 } elsif ($token->[1] eq 'link') {
  147: # ----------------------------------------------------------------------- Links
  148:                     $outstr.='<&>objlinks';
  149: 
  150:                         if ($token->[2]->{'index'}) {
  151: 			   if ($links[$token->[2]->{'index'}]) {
  152:                                $errtext.='Error: multiple use of link index '.
  153: 			       $token->[2]->{'index'}.'. ';
  154:                            }
  155: 			   $outstr.='<:>'.$token->[2]->{'index'};
  156:                            $links[$token->[2]->{'index'}]=1;
  157:                         } else {
  158:                            my $i=1;
  159:                            while (($i<=$#links) && ($links[$i]==1)) { $i++; }
  160:                            $outstr.='<:>'.$i;
  161:                            $links[$i]=1;
  162: 		       }
  163: 		    
  164:                     $outstr.='<:>'.$token->[2]->{'from'}.
  165:                              ':'.$token->[2]->{'to'};
  166:                     if ($token->[2]->{'condition'}) {
  167: 			$outstr.=':'.$token->[2]->{'condition'};
  168:                     } else {
  169:  			$outstr.=':0';
  170:                     }
  171: # ------------------------------------------------------------------- Parameter
  172:                 } elsif ($token->[1] eq 'param') {
  173:                     $outstr.='<&>objparms<:>'.$token->[2]->{'to'}.'<:>'.
  174:                             $token->[2]->{'type'}.'___'.$token->[2]->{'name'}
  175:                                                  .'___'.$token->[2]->{'value'};
  176:                 } elsif ($graphmode) {
  177: # --------------------------------------------- All other tags (graphical only)
  178:                     $outstr.='<&>'.$token->[1];
  179:                     if (defined($token->[2]->{'index'})) {
  180: 			$outstr.='<:>'.$token->[2]->{'index'};
  181:                         if ($token->[1] eq 'obj') {
  182: 			    $obj[$token->[2]->{'index'}]=2;
  183:                         }
  184:                     }
  185:                     $outstr.='<:>'.$token->[2]->{'value'};
  186:                 }
  187:             }
  188:         }
  189: 
  190:     } else {
  191:         $errtext.='Map not loaded: The file does not exist. ';
  192:     }
  193:     return($outstr,$errtext);
  194: }
  195: 
  196: 
  197: # ----------------------------------------------------------- Saves map to disk
  198: 
  199: sub savemap {
  200:     my ($fn,$errtext)=@_;
  201:     my %alltypes;
  202:     my %allvalues;
  203:     if (($fn=~/\.sequence(\.tmp)*$/) ||
  204:         ($fn=~/\.page(\.tmp)*$/)) {
  205: 
  206: # ------------------------------------------------------------- Deal with input
  207:         my @tags=split(/<&>/,$ENV{'form.output'});
  208:         my $outstr='';
  209:         my $graphdef=0;
  210:         if ($tags[0] eq 'graphdef<:>yes') {
  211: 	    $outstr='<map mode="rat/graphical">'."\n";
  212:             $graphdef=1;
  213:         } else {
  214:             $outstr="<map>\n";
  215:         }
  216:         foreach (@tags) {
  217: 	   my @parts=split(/<:>/,$_);
  218:            if ($parts[0] eq 'objcont') {
  219:                my @comp=split(/:/,$parts[$#parts]);
  220: # --------------------------------------------------------------- Logical input
  221: 	       if ($comp[$#comp] eq 'res') {
  222:                    $comp[0]=qtescape($comp[0]);
  223:                    $comp[1]=qtescape($comp[1]);
  224:                    if ($comp[2] eq 'true') {
  225: 		       if ($comp[1]!~/^http\:\/\//) {
  226: 			   $comp[1]='http://'.$comp[1];
  227:                        }
  228:                        $comp[1].='" external="true';
  229:                    } else {
  230: 		       if ($comp[1]=~/^http\:\/\//) {
  231: 			   $comp[1]=~s/^http\:\/\/[^\/]*\//\//;
  232:                        }
  233:                    }
  234: 		   $outstr.='<resource id="'.$parts[1].'" src="'
  235:                           .$comp[1].'"';
  236: 
  237:                    if (($comp[3] ne '') && ($comp[3] ne 'normal')) {
  238: 		       $outstr.=' type="'.$comp[3].'"';
  239:                    }
  240:                    if ($comp[0] ne '') {
  241: 		       $outstr.=' title="'.$comp[0].'"';
  242:                    }
  243:                    $outstr.="></resource>\n";
  244:                } elsif ($comp[$#comp] eq 'cond') {
  245:                    $outstr.='<condition id="'.$parts[1].'"';
  246:                    if (($comp[1] ne '') && ($comp[1] ne 'normal')) {
  247: 		       $outstr.=' type="'.$comp[1].'"';
  248:                    }
  249:                    $outstr.=' value="'.qtescape($comp[0]).'"';
  250:                    $outstr.="></condition>\n";
  251:                }
  252:            } elsif ($parts[0] eq 'objlinks') {
  253:                my @comp=split(/:/,$parts[$#parts]);
  254:                $outstr.='<link';
  255:                $outstr.=' from="'.$comp[0].'"';
  256:                $outstr.=' to="'.$comp[1].'"';
  257:                if (($comp[2] ne '') && ($comp[2]!=0)) {
  258:                   $outstr.=' condition="'.$comp[2].'"';
  259:                }
  260:                $outstr.=' index="'.$parts[1].'"';
  261:                $outstr.="></link>\n";
  262:            } elsif ($parts[0] eq 'objparms') {
  263:                undef %alltypes;
  264:                undef %allvalues;
  265:                foreach (split(/:/,$parts[$#parts])) {
  266:                    my ($type,$name,$value)=split(/\_\_\_/,$_);
  267:                    $alltypes{$name}=$type;
  268:                    $allvalues{$name}=$value;
  269:                }
  270:                foreach (keys %allvalues) {
  271:                   if ($allvalues{$_} ne '') {
  272:                    $outstr.='<param to="'.$parts[1].'" type="'
  273:                           .$alltypes{$_}.'" name="'.$_
  274:                           .'" value="'.$allvalues{$_}.'">'
  275:                           ."</param>\n";
  276: 	          }
  277:                }
  278:            } elsif (($parts[0] ne '') && ($graphdef)) {
  279: # ------------------------------------------------------------- Graphical input
  280:                $outstr.='<'.$parts[0];
  281:                if ($#parts==2) {
  282: 		   $outstr.=' index="'.$parts[1].'"';
  283:                }
  284:                $outstr.=' value="'.qtescape($parts[$#parts]).'"></'.
  285:                         $parts[0].">\n";
  286:            }
  287:         }
  288:         $outstr.="</map>\n";
  289: 	if ($fn=~/^\/*uploaded\/(\w+)\/(\w+)\/(.*)$/) {
  290: 	    $ENV{'form.output'}=$outstr;
  291:             my $home=&Apache::lonnet::homeserver($2,$1);
  292:             my $result=&Apache::lonnet::finishuserfileupload($2,$1,$home,
  293: 						'output',$3);
  294: 	    if ($result != m|^/uploaded/|) {
  295: 		$errtext.='Map not saved: A network error occured when trying to save the map. ';
  296: 	    }
  297:         } else {
  298:           my $fh;
  299:           if ($fh=Apache::File->new(">$fn")) {
  300:              print $fh $outstr;
  301:              $errtext.="Map saved as $fn. ";
  302: 	  } else {
  303:              $errtext.='Could not write file '.$fn.'.  Map not saved. ';
  304: 	  }
  305:         }
  306:     } else {
  307: # -------------------------------------------- Cannot write to that file, error
  308:         $errtext.='Map not saved: The specified path does not exist. ';
  309:     }
  310:     return $errtext;
  311: }
  312: 
  313: # ================================================================ Main Handler
  314: 
  315: sub handler {
  316:   my $r=shift;
  317:   $r->content_type('text/html');
  318:   $r->send_http_header;
  319: 
  320:   return OK if $r->header_only;
  321: 
  322:   my $url=$r->uri;
  323:   $url=~/\/(\w+)\/ratserver$/;
  324:   my $mode=$1;
  325: 
  326:   $url=~s/\/loadonly\/ratserver$/\/save\/ratserver/;
  327:   
  328:   my $fn=$r->filename;
  329:   my $lonDocRoot=$r->dir_config('lonDocRoot');
  330:   if ( $fn =~ /$lonDocRoot/ ) {
  331:       #internal authentication, needs fixup.
  332:       $fn = $url;
  333:       $fn=~s|^/~(\w+)|/home/$1/public_html|;
  334:       $fn=~s|/[^/]*/ratserver$||;
  335:   }
  336:   my $errtext='';
  337:   my $outtext='';
  338: 
  339:   if ($mode ne 'loadonly') {
  340:      $errtext=&savemap($fn,$errtext);
  341:   }
  342:   ($outtext,$errtext)=&loadmap($fn,$errtext);
  343: 
  344:   $r->print(<<ENDDOCUMENT);
  345: <html>
  346: <body bgcolor="#FFFFFF">
  347: <form name=storage method=post action="$url">
  348: <input type=hidden name=output value="$outtext">
  349: </form>
  350: <script>
  351:     parent.flag=1;
  352: </script>
  353: ENDDOCUMENT
  354:     if ($errtext ne '') {
  355: 	$r->print(<<ENDSCRIPT);
  356: <script>
  357:     alert("$errtext");
  358: </script>
  359: ENDSCRIPT
  360:     }
  361:     $r->print("</body>\n</html>\n");
  362: 
  363:   return OK;
  364: }
  365: 
  366: 1;
  367: __END__