Annotation of rat/lonambiguous.pm, revision 1.10

1.1       www         1: # The LearningOnline Network with CAPA
                      2: # Handler to resolve ambiguous file locations
                      3: #
1.10    ! www         4: # $Id: lonambiguous.pm,v 1.9 2003/04/12 15:43:58 www Exp $
1.4       www         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: #
1.1       www        28: # (TeX Content Handler
                     29: #
                     30: # 05/29/00,05/30,10/11 Gerd Kortemeyer)
                     31: #
1.3       www        32: # 10/11,10/12,10/16 Gerd Kortemeyer
1.1       www        33: 
                     34: package Apache::lonambiguous;
                     35: 
                     36: use strict;
                     37: use Apache::lonnet;
                     38: use Apache::Constants qw(:common REDIRECT);
                     39: use GDBM_File;
1.9       www        40: use Apache::loncommon;
1.10    ! www        41: use Apache::lonlocal;
1.1       www        42: 
1.8       www        43: my %bighash;
                     44: 
                     45: sub cleanup {
                     46:     if (tied(%bighash)){
                     47: 	&Apache::lonnet::logthis('Cleanup ambiguous: bighash');
                     48:         unless (untie(%bighash)) {
                     49: 	    &Apache::lonnet::logthis('Failed cleanup ambiguous: bighash');
                     50:         }
                     51:     }
                     52: }
1.1       www        53: 
                     54: # ----------------------------------------------------------- Could not resolve
                     55: 
                     56: sub getlost {
1.2       www        57:     my ($r,$errmsg)=@_;
1.10    ! www        58:     $errmsg=&mt($errmsg);
1.1       www        59:     $r->content_type('text/html');
                     60:     $r->send_http_header;
1.2       www        61:     $r->print(
1.9       www        62:  '<head><title>Unknown Error</title></head>'.
                     63:   &Apache::loncommon::bodytag('Could not handle ambiguous resource reference').
                     64:   $errmsg.
1.2       www        65:  '</body></html>');
1.1       www        66: }
                     67: 
                     68: # ================================================================ Main Handler
                     69: 
                     70: sub handler {
                     71:    my $r=shift;
                     72: 
                     73:    if ($r->header_only) {
1.10    ! www        74:       &Apache::loncommon::content_type($r,'text/html');
1.1       www        75:       $r->send_http_header;
                     76:       return OK;
                     77:    }
                     78: 
1.2       www        79: # ---------------------------------------------------------- Is this selecting?
1.8       www        80:  
1.2       www        81:    if ($ENV{'form.selecturl'}) {
                     82:        my $envkey;
                     83:        if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
1.5       albertel   84:                     &GDBM_READER(),0640)) {
1.2       www        85:           foreach $envkey (keys %ENV) {
                     86:              if ($envkey=~/^form\.(\d+)\.(\d+)$/) {
1.3       www        87: # ---------------------------------------------------- Update symb and redirect
1.2       www        88: 	         my $mapid=$1;
                     89:                  my $resid=$2;
                     90:                  my $resurl=$bighash{'src_'.$mapid.'.'.$resid};
                     91:                  &Apache::lonnet::symblist($bighash{'map_id_'.$mapid},
                     92: 				           $resurl => $resid);
1.3       www        93:                  untie(%bighash);
1.2       www        94:                  $r->header_out(Location => 
                     95:                                 'http://'.$ENV{'HTTP_HOST'}.$resurl);
                     96:                  return REDIRECT;
                     97:              }
                     98: 	  }
                     99:           untie(%bighash);
                    100:        } else {
                    101:           &getlost($r,'Could not access course structure.');
                    102:           return OK;
                    103:        }
                    104:    }
                    105: 
1.1       www       106: # ---------------------------------------------------------- Do we have a case?
                    107: 
                    108:    my $thisfn;
                    109:    unless (($thisfn=$ENV{'request.ambiguous'})&&($ENV{'request.course.fn'})) {
1.2       www       110:        &getlost($r,'Could not find information on resource.');
1.1       www       111:        return OK;
                    112:    }
                    113:       
                    114: # ---------------------------------- Should this file have been part of a page?
                    115: 
                    116:     $thisfn=&Apache::lonnet::declutter($thisfn);
                    117:     my %hash;
                    118:     my $syval='';
                    119:     
                    120:     if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
1.5       albertel  121:                   &GDBM_READER(),0640)) {
1.1       www       122:        $syval=$hash{$thisfn};
                    123:        untie(%hash);
                    124:     }
1.2       www       125: 
1.1       www       126: # ---------------------------------------------------------- There was an entry
1.2       www       127: 
1.1       www       128:     if ($syval) {
1.2       www       129: 
1.1       www       130:        if ($syval=~/\_$/) {
                    131: # ----------------------------------- Okay, this should have appeared on a page
                    132: 	   $syval=~s/\_\_\_$//;
                    133:  	   $r->content_type('text/html');
                    134:            $r->header_out(Location => 
                    135:                 'http://'.$ENV{'HTTP_HOST'}.'/res/'.$syval);
                    136:            return REDIRECT;
                    137:        } else {
                    138: #  There is not really a problem (???), but cannot go back without endless loop
1.2       www       139:            &getlost($r,'The nature of the problem is unclear');
1.1       www       140:            return OK;
                    141:        }
                    142:     }
                    143: 
                    144: # ------------------------------------------------ Would be standalone resource
                    145: 
                    146:    if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
1.5       albertel  147:                     &GDBM_READER(),0640)) {
1.1       www       148: # ---------------------------------------------- Get ID(s) for current resource
1.7       albertel  149:       my $ids=$bighash{'ids_'.&Apache::lonnet::clutter($thisfn)};
1.1       www       150:       if ($ids) {
                    151: # ------------------------------------------------------------------- Has ID(s)
                    152:          my @possibilities=split(/\,/,$ids);
                    153:          my $couldbe='';
                    154:          map {
1.2       www       155:              if (&Apache::lonnet::allowed('bre',$bighash{'src_'.$_})) {
1.1       www       156: 	         if ($couldbe) {
                    157: 		     $couldbe.=','.$_;
                    158:                  } else {
                    159:                      $couldbe=$_;
                    160:                  }
                    161:              }
                    162: 	 } @possibilities;
                    163:          if ($couldbe) {
                    164:             @possibilities=split(/\,/,$couldbe);
                    165:             if ($#possibilities>0) {
                    166: # ----------------------------------------------- Okay, really multiple choices
                    167:                $r->content_type('text/html');
                    168:                $r->send_http_header;
1.9       www       169:                my $bodytag=
                    170:                       &Apache::loncommon::bodytag('Pick Instance of Resource');
1.2       www       171:                $r->print(<<ENDSTART);
                    172: <head><title>Choose Location</title></head>
1.9       www       173: $bodytag
1.2       www       174: The resource you had been accessing appears more than once in this course,
                    175: and LON-CAPA has insufficient session information to determine which instance
                    176: of the resource you meant.
                    177: <p>
                    178: Please click on the instance of the resource you intended to access:
                    179: <p>
                    180: <form action="/adm/ambiguous" method=post>
                    181: <input type=hidden name=orgurl value="$thisfn">
                    182: <input type=hidden name=selecturl value=1>
                    183: <table border=2>
                    184: <tr><th>&nbsp;</th><th>Title</th><th>Type</th><th>Part of ...</th></tr>
                    185: ENDSTART
                    186:                map {
                    187:                    my $mapurl=$bighash{'map_id_'.(split(/\./,$_))[0]};
                    188:                    $r->print('<tr><td><input type=submit value=Select name="'.
                    189:                               $_.'"></td><td>'.$bighash{'title_'.$_}.
                    190:                               '</td><td>'.$bighash{'type_'.$_}.
1.9       www       191:                               '</td><td>'.
                    192:                               ($mapurl=~/^\/uploaded\//?'':'<a href="'.$mapurl.'">').
                    193:                               &Apache::lonnet::gettitle($mapurl).'&nbsp;'.
                    194: 			      ($mapurl=~/^\/uploaded\//?'':'</a>').'</td></tr>');
1.2       www       195:                } @possibilities;
                    196:                $r->print('</table></form></body></html>');
1.1       www       197: 	       untie(%bighash);
                    198:                return OK;
                    199:             }
                    200:          }
                    201:       }
                    202:       untie(%bighash);
                    203:   }
                    204: 
                    205: # ------------------------------------ This handler should not have been called
1.2       www       206:    &getlost($r,'Invalid call of handler');
1.1       www       207:    return OK;
                    208: }
                    209: 
                    210: 1;
                    211: __END__
                    212: 
                    213: 
                    214: 
                    215: 
                    216: 
                    217: 
                    218: 

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