--- rat/lonpageflip.pm 2000/11/16 11:58:30 1.13 +++ rat/lonpageflip.pm 2004/04/08 09:14:41 1.47 @@ -2,6 +2,30 @@ # # Page flip handler # +# $Id: lonpageflip.pm,v 1.47 2004/04/08 09:14:41 raeburn Exp $ +# +# Copyright Michigan State University Board of Trustees +# +# This file is part of the LearningOnline Network with CAPA (LON-CAPA). +# +# LON-CAPA is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# LON-CAPA is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with LON-CAPA; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# +# /home/httpd/html/adm/gpl.txt +# +# http://www.lon-capa.org/ +# # (Page Handler # # (TeX Content Handler @@ -11,7 +35,8 @@ # 10/02 Gerd Kortemeyer) # # 10/03,10/05,10/06,10/07,10/09,10/10,10/11,10/16,10/17, -# 11/14,11/16 Gerd Kortemeyer +# 11/14,11/16, +# 10/01/01,05/01,05/28,07/05 Gerd Kortemeyer package Apache::lonpageflip; @@ -25,19 +50,130 @@ use GDBM_File; my %hash; +sub cleanup { + if (tied(%hash)){ + &Apache::lonnet::logthis('Cleanup pageflip: hash'); + unless (untie(%hash)) { + &Apache::lonnet::logthis('Failed cleanup pageflip: hash'); + } + } +} + sub addrid { my ($current,$new,$condid)=@_; unless ($condid) { $condid=0; } - if (&Apache::lonnet::allowed('bre',$hash{'src_'.$new})) { + if ($current) { $current.=','.$new; } else { $current=''.$new; } - } + return $current; } +sub fullmove { + my ($rid,$mapurl,$direction)=@_; + if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', + &GDBM_READER(),0640)) { + ($rid,$mapurl)=&move($rid,$mapurl,$direction); + untie(%hash); + } + return($rid,$mapurl); +} + +sub move { + my ($rid,$mapurl,$direction)=@_; + my $startoutrid=$rid; + + my $next=''; + + my $mincond=1; + my $posnext=''; + if ($direction eq 'forward') { +# --------------------------------------------------------------------- Forward + while ($hash{'type_'.$rid} eq 'finish') { + $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}}; + } + map { + my $thiscond= + &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); + if ($thiscond>=$mincond) { + if ($posnext) { + $posnext.=','.$_.':'.$thiscond; + } else { + $posnext=$_.':'.$thiscond; + } + if ($thiscond>$mincond) { $mincond=$thiscond; } + } + } split(/\,/,$hash{'to_'.$rid}); + map { + my ($linkid,$condval)=split(/\:/,$_); + if ($condval>=$mincond) { + $next=&addrid($next,$hash{'goesto_'.$linkid}, + $hash{'condid_'.$hash{'undercond_'.$linkid}}); + } + } split(/\,/,$posnext); + if ($hash{'is_map_'.$next}) { +# This jumps to the beginning of a new map (going down level) + if ( + $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') { + $mapurl=$hash{'src_'.$next}; + $next=$hash{'map_start_'.$hash{'src_'.$next}}; + } elsif ( +# This jumps back up from an empty sequence, to a page up one level + $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') { + $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; + } + } elsif + ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) { +# This comes up from a map (coming up one level); + $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; + } + } elsif ($direction eq 'back') { +# ------------------------------------------------------------------- Backwards + while ($hash{'type_'.$rid} eq 'start') { + $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}}; + } + map { + my $thiscond= + &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); + if ($thiscond>=$mincond) { + if ($posnext) { + $posnext.=','.$_.':'.$thiscond; + } else { + $posnext=$_.':'.$thiscond; + } + if ($thiscond>$mincond) { $mincond=$thiscond; } + } + } split(/\,/,$hash{'from_'.$rid}); + map { + my ($linkid,$condval)=split(/\:/,$_); + if ($condval>=$mincond) { + $next=&addrid($next,$hash{'comesfrom_'.$linkid}, + $hash{'condid_'.$hash{'undercond_'.$linkid}}); + } + } split(/\,/,$posnext); + if ($hash{'is_map_'.$next}) { +# This jumps to the end of a new map (going down one level) + if ( + $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') { + $mapurl=$hash{'src_'.$next}; + $next=$hash{'map_finish_'.$hash{'src_'.$next}}; + } elsif ( + $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') { +# This jumps back up from an empty sequence, to a page up one level + $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; + } + } elsif + ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) { +# This comes back up from a map (going up one level); + $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; + } + } + return ($next,$mapurl); +} + # ================================================================ Main Handler sub handler { @@ -57,22 +193,30 @@ sub handler { my $redirecturl=''; my $next=''; my @possibilities=(); - + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']); if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) { $ENV{'form.postdata'}=~/(\w+)\:(.*)/; my $direction=$1; my $currenturl=$2; + $currenturl=~s/\.\d+\.(\w+)$/\.$1/; if ($direction eq 'return') { # -------------------------------------------------------- Return to last known my $last; if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', - &GDBM_READER,0640)) { + &GDBM_READER(),0640)) { $last=$hash{'last_known'}; untie(%hash); } my $newloc; - if ($last) { - $newloc='/res/'.(split(/\_\_\_/,$last))[1]; + if (($last) && (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', + &GDBM_READER(),0640))) { + my ($murl,$fn)=&Apache::lonnet::decode_symb($last); + my $id; + ($murl,$id,$fn)=&Apache::lonnet::decode_symb(&Apache::lonnet::symbread($fn)); + $newloc=$hash{'src_'. + $hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id}; + unless ($newloc) { $newloc='/adm/noidea.html'; } + untie %hash; } else { $newloc='/adm/noidea.html'; } @@ -84,15 +228,18 @@ sub handler { } $currenturl=~s/^http\:\/\///; $currenturl=~s/^[^\/]+//; - unless ($currenturl=~/\/res\//) { +# +# Is the current URL on the map? If not, start with last known URL +# + unless (&Apache::lonnet::is_on_map($currenturl)) { my $last; if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', - &GDBM_READER,0640)) { + &GDBM_READER(),0640)) { $last=$hash{'last_known'}; untie(%hash); } if ($last) { - $currenturl='/res/'.(split(/\_\_\_/,$last))[1]; + $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[1]); } else { $r->content_type('text/html'); $r->header_out(Location => @@ -104,69 +251,37 @@ sub handler { my $position; if ($position=Apache::lonnet::symbread($currenturl)) { # ------------------------------------------------------------------------- Yes - my ($mapurl,$mapnum,$thisurl)=split(/\_\_\_/,$position); - $cachehash{$thisurl}=$mapnum; + my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position); + $cachehash{$startoutmap}{$thisurl}=$mapnum; + $cachehash{$startoutmap}{'last_known'}= + &Apache::lonnet::declutter($currenturl); + # ============================================================ Tie the big hash if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', - &GDBM_READER,0640)) { - my $rid=$hash{'map_pc_/res/'.$mapurl}.'.'.$mapnum; - my $next=''; - my $mincond=1; - my $posnext=''; - if ($direction eq 'forward') { -# --------------------------------------------------------------------- Forward - map { - my $thiscond= - &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); - if ($thiscond>=$mincond) { - if ($posnext) { - $posnext.=','.$_.':'.$thiscond; - } else { - $posnext=$_.':'.$thiscond; - } - if ($thiscond>$mincond) { $mincond=$thiscond; } - } - } split(/\,/,$hash{'to_'.$rid}); - map { - my ($linkid,$condval)=split(/\:/,$_); - if ($condval>=$mincond) { - $next=&addrid($next,$hash{'goesto_'.$linkid}, - $hash{'condid_'.$hash{'undercond_'.$linkid}}); - } - } split(/\,/,$posnext); - } elsif ($direction eq 'back') { -# ------------------------------------------------------------------- Backwards - map { - my $thiscond= - &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); - if ($thiscond>=$mincond) { - if ($posnext) { - $posnext.=','.$_.':'.$thiscond; - } else { - $posnext=$_.':'.$thiscond; - } - if ($thiscond>$mincond) { $mincond=$thiscond; } - } - } split(/\,/,$hash{'from_'.$rid}); - map { - my ($linkid,$condval)=split(/\:/,$_); - if ($condval>=$mincond) { - $next=&addrid($next,$hash{'comesfrom_'.$linkid}, - $hash{'condid_'.$hash{'undercond_'.$linkid}}); - } - } split(/\,/,$posnext); - } elsif ($direction eq 'up') { -# -------------------------------------------------------------------------- Up - } elsif ($direction eq 'down') { -# ------------------------------------------------------------------------ Down - } + &GDBM_READER(),0640)) { + my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}. + '.'.$mapnum; + +# ------------------------------------------------- Move forward, backward, etc + my $endupmap; + ($next,$endupmap)=&move($rid,$startoutmap,$direction); +# -------------------------------------- Do we have one and only one empty URL? + my $safecount=0; + while (($next) && ($next!~/\,/) && + ((!$hash{'src_'.$next}) || ($hash{'randomout_'.$next})) + && ($safecount<10000)) { + ($next,$endupmap)=&move($next,$endupmap,$direction); + $safecount++; + } +# We are now at at least one non-empty URL # ----------------------------------------------------- Check out possibilities if ($next) { @possibilities=split(/\,/,$next); if ($#possibilities==0) { # ---------------------------------------------- Only one possibility, redirect $redirecturl=$hash{'src_'.$next}; - $cachehash{&Apache::lonnet::declutter($redirecturl)} + $cachehash{$endupmap} + {&Apache::lonnet::declutter($redirecturl)} =(split(/\./,$next))[1]; } else { # ------------------------ There are multiple possibilities for a next resource @@ -175,12 +290,20 @@ sub handler { $multichoicehash{'src_'.$_}=$hash{'src_'.$_}; $multichoicehash{'title_'.$_}=$hash{'title_'.$_}; $multichoicehash{'type_'.$_}=$hash{'type_'.$_}; + (my $first, my $second) = $_ =~ /(\d+).(\d+)/; + my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$_}); + $multichoicehash{'symb_'.$_} = + Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'. + $second.'___'.$symbSrc); + + my ($choicemap,$choiceres)=split(/\./,$_); $cachehash - {&Apache::lonnet::declutter( + {&Apache::lonnet::declutter($hash{'src_'.$choicemap})} + {&Apache::lonnet::declutter( $multichoicehash {'src_'.$_} )} - =(split(/\./,$_))[1]; + =$choiceres; } @possibilities; } } else { @@ -190,12 +313,33 @@ sub handler { # ----------------- The program must come past this point to untie the big hash untie(%hash); # --------------------------------------------------------- Store position info - $cachehash{'last_direction'}=$direction; - $cachehash{'last_known'}=&Apache::lonnet::declutter($currenturl); - &Apache::lonnet::symblist($mapurl,%cachehash); + $cachehash{$startoutmap}{'last_direction'}=$direction; + foreach my $thismap (keys %cachehash) { + &Apache::lonnet::symblist($thismap,%{$cachehash{$thismap}}); + } # ============================================== Do not return before this line if ($redirecturl) { # ----------------------------------------------------- There is a URL to go to + if ($direction eq 'forward') { + &Apache::lonnet::linklog($currenturl,$redirecturl); + } + if ($direction eq 'back') { + &Apache::lonnet::linklog($redirecturl,$currenturl); + } +# ------------------------------------------------- Check for critical messages + if ((time-$ENV{'user.criticalcheck.time'})>300) { + my @what=&Apache::lonnet::dump + ('critical',$ENV{'user.domain'}, + $ENV{'user.name'}); + if ($what[0]) { + if (($what[0] ne 'con_lost') && + ($what[0]!~/^error\:/)) { + $redirecturl='/adm/email?critical=display'; + } + } + &Apache::lonnet::appenv('user.criticalcheck.time'=>time); + } + $r->content_type('text/html'); $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$redirecturl); @@ -205,34 +349,41 @@ sub handler { $r->content_type('text/html'); $r->send_http_header; if ($#possibilities>0) { + my $bodytag= + &Apache::loncommon::bodytag('Multiple Resources'); $r->print(<Choose Next Location - -

LON-CAPA

-There are several possibilities of where to go next. +$bodytag +

There are several possibilities of where to go next

Please click on the the resource you intend to access:

ENDSTART - map { + foreach (@possibilities) { $r->print( ''); - } @possibilities; + } $r->print('
TitleType
'. + $multichoicehash{'src_'.$_}.'?symb=' . + Apache::lonnet::escape($multichoicehash{'symb_'.$_}).'">'. $multichoicehash{'title_'.$_}. ''.$multichoicehash{'type_'.$_}. '
'); return OK; } else { + my $bodytag=&Apache::loncommon::bodytag('No Resource'); $r->print(<Choose Next Location - - -

Sorry!

-

Next resource could not be identified.

+No Resource +$bodytag +

Next resource could not be identified.

+

You probably are at the beginning or the end of the +course.

+ ENDNONE @@ -246,7 +397,10 @@ ENDNONE } } else { # ---------------------------------------- No, could not determine where we are - $r->internal_redirect('/adm/ambiguous'); + if ( &Apache::lonnet::mod_perl_version() == 2 ) { + &Apache::lonnet::cleanenv(); + } + $r->internal_redirect('/adm/ambiguous'); } } else { # -------------------------- Class was not initialized or page fliped strangely 500 Internal Server Error

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.