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    1: # The LearningOnline Network with CAPA
    2: #
    3: # Sequence Handler
    4: #
    5: # $Id: lonsequence.pm,v 1.27 2006/06/08 13:56:40 www Exp $
    6: #
    7: # Copyright Michigan State University Board of Trustees
    8: #
    9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   10: #
   11: # LON-CAPA is free software; you can redistribute it and/or modify
   12: # it under the terms of the GNU General Public License as published by
   13: # the Free Software Foundation; either version 2 of the License, or
   14: # (at your option) any later version.
   15: #
   16: # LON-CAPA is distributed in the hope that it will be useful,
   17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   19: # GNU General Public License for more details.
   20: #
   21: # You should have received a copy of the GNU General Public License
   22: # along with LON-CAPA; if not, write to the Free Software
   23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   24: #
   25: # /home/httpd/html/adm/gpl.txt
   26: #
   27: # http://www.lon-capa.org/
   28: #
   29: 
   30: package Apache::lonsequence;
   31: 
   32: use strict;
   33: use Apache::lonnet;
   34: use Apache::Constants qw(:common :http REDIRECT);
   35: use GDBM_File;
   36: use Apache::lonratedt;
   37: use Apache::lonratsrv;
   38: use Apache::lonpageflip;
   39: use Apache::loncommon;
   40: use Apache::lonlocal;
   41: 
   42: my %selhash;
   43: my $successtied;
   44: 
   45: # ----------------------------------------- Attempt to read from resource space
   46: 
   47: sub attemptread {
   48:     my $fn=shift;
   49:     &Apache::lonnet::repcopy($fn);
   50:     if (-e $fn) {
   51: 	return &Apache::lonratedt::attemptread($fn);
   52:     } else {
   53:         return ();
   54:     }
   55: }
   56: 
   57: sub mapread {
   58:     my $fn=shift;
   59:     &Apache::lonnet::repcopy($fn);
   60:     if (-e $fn) {
   61: 	return &Apache::lonratedt::mapread($fn,'');
   62:     } else {
   63:         return ();
   64:     }
   65: }
   66: 
   67: # ---------------------------------------------------------------- View Handler
   68: 
   69: sub viewmap {
   70:     my ($r,$url)=@_;
   71: 
   72:     my $js;
   73:     if ($env{'form.forceselect'}) {
   74: 	$js = (<<ENDSCRIPT);
   75: <script type="text/javascript">
   76: 
   77: function select_group() {
   78:     window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value;
   79: }
   80: 
   81: function queue(val) {
   82:     if (eval("document.forms."+val+".filelink.checked")) {
   83: 	var l=val.length;
   84: 	var v=val.substring(4,l);
   85: 	document.forms.fileattr.acts.value+='1a'+v+'b';
   86:     }
   87:     else {
   88: 	var l=val.length;
   89: 	var v=val.substring(4,l);
   90: 	document.forms.fileattr.acts.value+='0a'+v+'b';
   91:     }
   92: }
   93: 
   94: </script>
   95: ENDSCRIPT
   96:     }
   97: 
   98:     $r->print(&Apache::loncommon::start_page('Map Contents',$js).
   99: 	      '<h1>'.$url.'</h1>');
  100: # ------------------ This is trying to select. Provide buttons and tie %selhash
  101:     if ($env{'form.forceselect'}) { $r->print(<<ENDSELECT);
  102: <form name=fileattr><input type=hidden name=acts value=''>
  103: <input type="button" name="close" value='CLOSE' onClick="self.close()">
  104: <input type="button" name="groupimport" value='GROUP IMPORT'
  105: onClick="javascript:select_group()">
  106: </form>   
  107: ENDSELECT
  108:     my $diropendb = 
  109:     "/home/httpd/perl/tmp/$env{'user.domain'}\_$env{'user.name'}_sel_res.db";
  110:         if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
  111: 	    if ($env{'form.launch'} eq '1') {
  112: 	       &start_fresh_session();
  113: 	    }
  114:             $successtied=1;
  115: 
  116: # - Evaluate actions from previous page (both cumulatively and chronologically)
  117:         if ($env{'form.catalogmode'} eq 'import') {
  118: 	    my $acts=$env{'form.acts'};
  119: 	    my @Acts=split(/b/,$acts);
  120: 	    my %ahash;
  121: 	    my %achash;
  122: 	    my $ac=0;
  123: 	    # some initial hashes for working with data
  124: 	    foreach (@Acts) {
  125: 		my ($state,$ref)=split(/a/);
  126: 		$ahash{$ref}=$state;
  127: 		$achash{$ref}=$ac;
  128: 		$ac++;
  129: 	    }
  130: 	    # sorting through the actions and changing the tied database hash
  131: 	    foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
  132: 		my $key=$_;
  133: 		if ($ahash{$key} eq '1') {
  134: 		    $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}=
  135: 			$selhash{'pre_'.$key.'_title'};
  136: 		    $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}=
  137: 			$selhash{'storectr'}+0;
  138: 		    $selhash{'storectr'}++;
  139: 		}
  140: 		if ($ahash{$key} eq '0') {
  141: 		    if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) {
  142: 		       delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}};
  143: 		    }
  144: 		}
  145: 	    }
  146: 	    # deleting the previously cached listing
  147: 	    foreach (keys %selhash) {
  148: 		if ($_ =~ /^pre_/ && $_ =~/link$/) {
  149: 		    my $key = $_;
  150: 		    $key =~ s/^pre_//;
  151: 		    $key =~ s/_[^_]*$//;
  152: 		    delete $selhash{'pre_'.$key.'_title'};
  153: 		    delete $selhash{'pre_'.$key.'_link'};
  154: 		}
  155: 	    }
  156: 	}
  157: # -
  158:         }
  159:     }
  160: # ----------------------------- successtied is now '1' if in working selectmode
  161:     my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),'');
  162:     if ($fatal==1) {
  163:        $r->print('<p><b><font color="red">'.&mt('Map contents are not shown in order.').'</font></b></p><br />');
  164:     }
  165:     my $idx=0;
  166:     foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
  167: 	if (defined($_)) {
  168:             $idx++;
  169:             if ($successtied) { 
  170: 		$r->print('<form name="form'.$idx.'">');
  171:             }
  172: 	    my ($title,$url)=split(/\:/,$_);
  173:             $title=~s/\&colon\;/\:/g;
  174:             $url=~s/\&colon\;/\:/g;
  175:             unless ($title) { $title=(split(/\//,$url))[-1] };
  176:             unless ($title) { $title='<i>'.&mt('Empty').'</i>'; }
  177:             if ($url) {
  178: 		if ($successtied) {
  179: 		    my $checked='';
  180: 	           if ($selhash{'store_'.$url}) {
  181: 	       	      $checked=" checked";
  182: 	           }
  183: 	           $selhash{"pre_${idx}_link"}=$url;
  184: 	           $selhash{"pre_${idx}_title"}=$title;
  185: 
  186: 		    $r->print(<<ENDCHECKBOX);
  187: <input type='checkbox' name='filelink' 
  188: value='$url' onClick='javascript:queue("form$idx")'$checked>
  189: <input type='hidden' name='title' value='$title'>
  190: ENDCHECKBOX
  191:                 }
  192: 		$r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
  193:             }
  194:             $r->print(&Apache::lonratsrv::qtescape($title));
  195:             if ($url) { $r->print('</a>'); }
  196:             if ($successtied) {
  197: 		$r->print('</form>');
  198:             } else {
  199: 		$r->print('<br>');
  200:             }
  201:         }
  202:     }
  203:     $r->print(&Apache::loncommon::end_page());
  204:     if ($successtied) {
  205: 	untie %selhash;
  206:     }
  207: }
  208: 
  209: # ----------------------------------------------------------- Clean out selhash
  210: sub start_fresh_session {
  211:     foreach (keys %selhash) {
  212: 	if ($_ =~ /^pre_/) {
  213: 	    delete $selhash{$_};
  214: 	}
  215: 	if ($_ =~ /^store/) {
  216: 	    delete $selhash{$_};
  217: 	}
  218:     }
  219: }
  220: 
  221: 
  222: # ================================================================ Main Handler
  223: 
  224: sub handler {
  225:    my $r=shift;
  226: 
  227:    if ($r->header_only) {
  228:       &Apache::loncommon::content_type($r,'text/html');
  229:       $r->send_http_header;
  230:       return OK;
  231:    }
  232:  
  233:    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
  234:                                           ['forceselect','launch']);
  235: 
  236:    my %hash;
  237:    my %bighash;
  238:    my $requrl=$r->uri;
  239: 
  240:    $successtied=0;
  241: # ------------------------------------------------------------ Tie symb db file
  242:   my $disurl='';
  243:   my $dismapid='';
  244:   my $exitdisid = '';
  245:   my $arrow_dir = '';
  246: 
  247:   if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) {
  248:        my $last;
  249:        if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
  250:                     &GDBM_READER(),0640)) {
  251: 	   $last=$hash{'last_direction'};
  252:            untie(%hash);
  253:        }
  254:        my $direction='';
  255:        my $prevmap='';
  256:        if ($last) {
  257: 	   ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last);
  258:        }
  259: # ------------------------------------------------------------- Tie big db file
  260:        if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
  261:                     &GDBM_READER(),0640)) {
  262: 	   my $disid='';
  263:            my $randomout ='';
  264: 
  265:            if ($direction eq 'back') {
  266: 	       $disid=$bighash{'map_finish_'.$requrl};
  267:            } else {
  268:                $disid=$bighash{'map_start_'.$requrl};
  269:            }
  270:            if ($disid) {
  271: 	       $disurl=$bighash{'src_'.$disid};
  272:                $dismapid=(split(/\./,$disid))[1];
  273: 	       if (!$env{'request.role.adv'}) {
  274: 		   $randomout = $bighash{'randomout_'.$disid};
  275: 	       }
  276:            } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
  277:                     &GDBM_READER(),0640)) {
  278:                $last=$hash{'last_known'};
  279:                untie(%hash);
  280:            }
  281: 
  282: 
  283: # ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one
  284:            while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) {
  285: 	       $direction=($direction?$direction:'forward');
  286:                ($disid,$requrl)=
  287:                          &Apache::lonpageflip::fullmove($disid,
  288:                            &Apache::lonnet::declutter($requrl),$direction);
  289:                if ($disid) {
  290: 	           $disurl=$bighash{'src_'.$disid};
  291:                    $dismapid=(split(/\./,$disid))[1];
  292: 		   if (!$env{'request.role.adv'}) {
  293: 		       $randomout = $bighash{'randomout_'.$disid};
  294: 		   }
  295:                }
  296:  	   }
  297:            $exitdisid = $disid;
  298:            $arrow_dir = $direction;
  299: 
  300: # --------------------------------------- Untie hash, make sure to come by here
  301:            untie(%bighash);
  302:        }
  303:    }
  304: 
  305: # now either disurl is set (going to first page), or we need another display
  306:    if ($disurl) {
  307: # -------------------------------------------------- Has first or last resource
  308:       &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid],
  309: 				'last_known' => [$disurl,$dismapid]); 
  310:       &Apache::loncommon::content_type($r,'text/html');
  311:       $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
  312:       return REDIRECT;
  313:    } else {
  314:        &Apache::loncommon::content_type($r,'text/html');
  315:        $r->send_http_header;
  316:        if ($exitdisid eq '' && $arrow_dir ne '') {
  317:            my %lt =&Apache::lonlocal::texthash(
  318:                    'back' => 'beginning',
  319:                    'forward' => 'end',
  320:                    'nere' => 'Next resource could not be displayed',
  321:                    'goba' => 'Go Back',
  322:                    'nacc' => 'Navigate Course Content',
  323:                           );
  324:            my $warnmsg = &mt('As all folders and sequences ');
  325:            if ($arrow_dir eq 'forward') {
  326:                $warnmsg .= &mt('following the current resource were empty').',';
  327:            } elsif ($arrow_dir eq 'back') {
  328:                $warnmsg .= &mt('preceding the current resource were empty').',';
  329:            }
  330:            $warnmsg .= &mt('you have now reached the').' '.$lt{$arrow_dir}.' '.&mt('of the course.');
  331:            my $start_page=
  332: 	       &Apache::loncommon::start_page('Empty Folder/Sequence');
  333:            my $end_page=
  334: 	       &Apache::loncommon::end_page();
  335:            $r->print(<<ENDNONE);
  336: $start_page
  337: <h3>$lt{'nere'}</h3>
  338: <p>$warnmsg</p>
  339: <ul>
  340:   <li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li>
  341:   <li><a href="/adm/navmaps">$lt{'nacc'}</a></li>
  342: </ul>
  343: $end_page
  344: ENDNONE
  345:        } else {
  346:            &viewmap($r,$requrl);
  347:        }
  348:        return OK;
  349:    }
  350: }
  351: 
  352: 1;
  353: __END__
  354: 
  355: 
  356: 
  357: 
  358: 
  359: 
  360: