--- rat/lonpageflip.pm 2000/10/11 18:31:00 1.5 +++ rat/lonpageflip.pm 2005/03/01 00:22:57 1.52 @@ -2,15 +2,30 @@ # # Page flip handler # -# (Page Handler +# $Id: lonpageflip.pm,v 1.52 2005/03/01 00:22:57 albertel Exp $ # -# (TeX Content Handler +# Copyright Michigan State University Board of Trustees # -# 05/29/00,05/30 Gerd Kortemeyer) -# 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23, -# 10/02 Gerd Kortemeyer) +# 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/ # -# 10/03,10/05,10/06,10/07,10/09,10/10,10/11 Gerd Kortemeyer package Apache::lonpageflip; @@ -24,60 +39,59 @@ 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 $current; } -# ================================================================ Main Handler +sub fullmove { + my ($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 handler { - my $r=shift; +sub hash_src { + my ($id)=@_; + if ($hash{'encrypted_'.$id}) { + return &Apache::lonenc::encrypted($hash{'src_'.$id}); + } + return $hash{'src_'.$id}; +} -# ------------------------------------------- Set document type for header only +sub move { + my ($rid,$mapurl,$direction)=@_; + my $startoutrid=$rid; - if ($r->header_only) { - $r->content_type('text/html'); - $r->send_http_header; - return OK; - } + my $next=''; - my %cachehash=(); - my $multichoice=0; - my %multichoicehash=(); - my $redirecturl=''; - my $next=''; - my @possibilities=(); - - if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) { - $ENV{'form.postdata'}=~/(\w+)\:(.*)/; - my $direction=$1; - my $currenturl=$2; - $currenturl=~s/^http\:\/\///; - $currenturl=~s/^[^\/]+//; -# ------------------------------------------- Do we have any idea where we are? - my $position; - if ($position=Apache::lonnet::symbread($currenturl)) { -# ------------------------------------------------------------------------- Yes - my ($mapurl,$mapnum,$thisurl)=split(/\_\_\_/,$position); - $cachehash{$thisurl}=$mapnum; -# ============================================================ Tie the big hash - if (tie(%hash,'GDBM_File',$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 + while ($hash{'type_'.$rid} eq 'finish') { + $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}}; + } map { my $thiscond= &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); @@ -97,8 +111,27 @@ sub handler { $hash{'condid_'.$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_'.$hash{'undercond_'.$_}}); @@ -118,31 +151,158 @@ sub handler { $hash{'condid_'.$hash{'undercond_'.$linkid}}); } } split(/\,/,$posnext); - } elsif ($direction eq 'up') { -# -------------------------------------------------------------------------- Up - } elsif ($direction eq 'down') { -# ------------------------------------------------------------------------ Down + 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 { + my $r=shift; + +# ------------------------------------------- Set document type for header only + + if ($r->header_only) { + &Apache::loncommon::content_type($r,'text/html'); + $r->send_http_header; + return OK; + } + + my %cachehash=(); + my $multichoice=0; + my %multichoicehash=(); + 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=$2; + if ($currenturl=~m|^/enc/|) { + $currenturl=&Apache::lonenc::unencrypted($currenturl); + } + $currenturl=~s/\.\d+\.(\w+)$/\.$1/; + if ($direction eq 'return') { +# -------------------------------------------------------- Return to last known + my $last; + if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', + &GDBM_READER(),0640)) { + $last=$hash{'last_known'}; + untie(%hash); + } + my $newloc; + if (($last) && (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', + &GDBM_READER(),0640))) { + my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last); + $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id; + $newloc=$hash{'src_'.$id}; + if ($newloc) { + if ($hash{'encrypted_'.$id}) { $newloc=&Apache::lonenc::encrypted($newloc); } + + } else { + $newloc='/adm/noidea.html'; + } + untie %hash; + } else { + $newloc='/adm/noidea.html'; + } + &Apache::loncommon::content_type($r,'text/html'); + $r->header_out(Location => + 'http://'.$ENV{'HTTP_HOST'}.$newloc); + + return REDIRECT; + } + $currenturl=~s/^http\:\/\///; + $currenturl=~s/^[^\/]+//; +# +# Is the current URL on the map? If not, start with last known URL +# + unless (&Apache::lonnet::is_on_map($currenturl)) { + my $last; + if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', + &GDBM_READER(),0640)) { + $last=$hash{'last_known'}; + untie(%hash); + } + if ($last) { + $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]); + } else { + &Apache::loncommon::content_type($r,'text/html'); + $r->header_out(Location => + 'http://'.$ENV{'HTTP_HOST'}.'/adm/noidea.html'); + return REDIRECT; + } + } +# ------------------------------------------- Do we have any idea where we are? + my $position; + if ($position=Apache::lonnet::symbread($currenturl)) { +# ------------------------------------------------------------------------- Yes + my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position); + $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum]; + $cachehash{$startoutmap}{'last_known'}= + [&Apache::lonnet::declutter($currenturl),$mapnum]; + +# ============================================================ Tie the big hash + if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', + &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_'.$next}) || + ((!$ENV{'request.role.adv'}) && $hash{'randomout_'.$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)} - =(split(/\./,$next))[1]; + $redirecturl=&hash_src($next); + $cachehash{$endupmap}{$redirecturl}= + [$redirecturl,(split(/\./,$next))[1]]; } else { # ------------------------ There are multiple possibilities for a next resource $multichoice=1; map { $multichoicehash{'src_'.$_}=$hash{'src_'.$_}; $multichoicehash{'title_'.$_}=$hash{'title_'.$_}; - $cachehash - {&Apache::lonnet::declutter( - $multichoicehash - {'src_'.$_} - )} - =(split(/\./,$_))[1]; + $multichoicehash{'type_'.$_}=$hash{'type_'.$_}; + (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(/\./,$_); + my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap}); + my $url=$multichoicehash{'src_'.$_}; + $cachehash{$map}{$url}=[$url,$choiceres]; } @possibilities; } } else { @@ -152,18 +312,86 @@ sub handler { # ----------------- The program must come past this point to untie the big hash untie(%hash); # --------------------------------------------------------- Store position info - $cachehash{'last_direction'}=$direction; - &Apache::lonnet::symblist($mapurl,%cachehash); + $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb']; + foreach my $thismap (keys %cachehash) { + my $mapnum=$cachehash{$thismap}->{'mapnum'}; + delete($cachehash{$thismap}->{'mapnum'}); + &Apache::lonnet::symblist($thismap, + %{$cachehash{$thismap}}); + } # ============================================== Do not return before this line if ($redirecturl) { # ----------------------------------------------------- There is a URL to go to - $r->content_type('text/html'); + if ($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\:/)) { + $redirecturl='/adm/email?critical=display'; + } + } + &Apache::lonnet::appenv('user.criticalcheck.time'=>time); + } + + &Apache::loncommon::content_type($r,'text/html'); $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$redirecturl); return REDIRECT; } else { # --------------------------------------------------------- There was a problem - } + &Apache::loncommon::content_type($r,'text/html'); + $r->send_http_header; + if ($#possibilities>0) { + my $bodytag= + &Apache::loncommon::bodytag('Multiple Resources'); + $r->print(<Choose Next Location +$bodytag +

There are several possibilities of where to go next

+

+Please click on the the resource you intend to access: +

+ + +ENDSTART + foreach (@possibilities) { + $r->print( + ''); + } + $r->print('
TitleType
'. + $multichoicehash{'title_'.$_}. + ''.$multichoicehash{'type_'.$_}. + '
'); + return OK; + } else { + my $bodytag=&Apache::loncommon::bodytag('No Resource'); + $r->print(<No Resource +$bodytag +

Next resource could not be identified.

+

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

+ + + +ENDNONE + return OK; + } + } } else { # ------------------------------------------------- Problem, could not tie hash $ENV{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing"; @@ -171,6 +399,10 @@ sub handler { } } else { # ---------------------------------------- No, could not determine where we are + if ( &Apache::lonnet::mod_perl_version() == 2 ) { + &Apache::lonnet::cleanenv(); + } + $r->internal_redirect('/adm/ambiguous'); } } else { # -------------------------- Class was not initialized or page fliped strangely