--- rat/lonpageflip.pm 2000/10/07 22:30:30 1.3 +++ rat/lonpageflip.pm 2003/03/08 01:39:29 1.37 @@ -2,6 +2,30 @@ # # Page flip handler # +# $Id: lonpageflip.pm,v 1.37 2003/03/08 01:39:29 www 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 @@ -10,12 +34,14 @@ # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23, # 10/02 Gerd Kortemeyer) # -# 10/03,10/05,10/06,10/07 Gerd Kortemeyer +# 10/03,10/05,10/06,10/07,10/09,10/10,10/11,10/16,10/17, +# 11/14,11/16, +# 10/01/01,05/01,05/28,07/05 Gerd Kortemeyer package Apache::lonpageflip; use strict; -use Apache::Constants qw(:common :http); +use Apache::Constants qw(:common :http REDIRECT); use Apache::lonnet(); use HTML::TokeParser; use GDBM_File; @@ -24,18 +50,122 @@ 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)=@_; - if (&Apache::lonnet::allowed('bre',$hash{'src_'.$new})) { + my ($current,$new,$condid)=@_; + unless ($condid) { $condid=0; } + if ($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 + ((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 + ((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 { @@ -49,73 +179,216 @@ sub handler { return OK; } - -# --------BEGIN DEBUG ONLY TRASH - $r->content_type('text/html'); - $r->send_http_header; - - $r->print(''); -# --------END DEBUG ONLY TRASH - - my %cachehash=(); - my $redir=0; - + 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; - my $redirecturl=$currenturl; + 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,$fn)=split(/\_\_\_/,$last); + my $id; + ($murl,$id,$fn)=split(/\_\_\_/,&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'; + } + $r->content_type('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) { + $currenturl=&Apache::lonnet::clutter((split(/\_\_\_/,$last))[1]); + } else { + $r->content_type('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($currenturl)) { # ------------------------------------------------------------------------- Yes - my ($mapurl,$mapnum,$thisurl)=split(/\_\_\_/,$position); - $cachehash{$thisurl}=$mapnum; + my ($startoutmap,$mapnum,$thisurl)=split(/\_\_\_/,$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 $next=''; - if ($direction eq 'forward') { - map { - $next=&addrid($next,$hash{'goesto_'.$_}); - } split(/\,/,$hash{'to_'.$rid}); - my @possibilities=split(/,/,$next); - if ($#possibilities==1) { - my $goto=$possibilities[0]; - } - } elsif ($direction eq 'back') { - } elsif ($direction eq 'up') { - } elsif ($direction eq '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}; + $cachehash{$endupmap} + {&Apache::lonnet::declutter($redirecturl)} + =(split(/\./,$next))[1]; + } else { +# ------------------------ There are multiple possibilities for a next resource + $multichoice=1; + map { + $multichoicehash{'src_'.$_}=$hash{'src_'.$_}; + $multichoicehash{'title_'.$_}=$hash{'title_'.$_}; + $multichoicehash{'type_'.$_}=$hash{'type_'.$_}; + (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(/\./,$_); + $cachehash + {&Apache::lonnet::declutter($hash{'src_'.$choicemap})} + {&Apache::lonnet::declutter( + $multichoicehash + {'src_'.$_} + )} + =$choiceres; + } @possibilities; + } + } else { +# -------------------------------------------------------------- No place to go + $multichoice=-1; } +# ----------------- The program must come past this point to untie the big hash untie(%hash); - $r->print($rid.' - '.$next); +# --------------------------------------------------------- Store position info + $cachehash{$startoutmap}{'last_direction'}=$direction; + foreach my $thismap (keys %cachehash) { + &Apache::lonnet::symblist($thismap,%{$cachehash{$thismap}}); + } +# ============================================== Do not return before this line + if ($redirecturl) { +# ----------------------------------------------------- There is a URL to go to +# ------------------------------------------------- Check for critical messages + if ((time-$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); + return REDIRECT; + } else { +# --------------------------------------------------------- There was a problem + $r->content_type('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"; + return HTTP_NOT_ACCEPTABLE; } } else { -# -------------------------------------------------------------------------- No - $r->print('No idea '.$currenturl); +# ---------------------------------------- No, could not determine where we are + $r->internal_redirect('/adm/ambiguous'); } -# -------------------------- Class was not initialized or page fliped strangely } else { +# -------------------------- Class was not initialized or page fliped strangely $ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course"; return HTTP_NOT_ACCEPTABLE; } - - - - -# ------TRASH BELOW -# --------------------------- TRASH - - $r->print(''); - return OK; - - -# ========================================================= TOTAL TRASH - -# &Apache::lonnet::symblist($requrl,%symbhash); - } 1;