--- rat/lonpageflip.pm 2000/10/09 19:37:35 1.4 +++ rat/lonpageflip.pm 2018/11/13 03:59:17 1.98 @@ -2,21 +2,43 @@ # # Page flip handler # -# (Page Handler +# $Id: lonpageflip.pm,v 1.98 2018/11/13 03:59:17 raeburn 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). # -# 10/03,10/05,10/06,10/07,10/09 Gerd Kortemeyer +# 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/ +# + + package Apache::lonpageflip; use strict; +use LONCAPA; use Apache::Constants qw(:common :http REDIRECT); -use Apache::lonnet(); +use Apache::lonnet; +use Apache::loncommon(); +use Apache::lonnavmaps(); +use Apache::lonuserstate; +use Apache::lonlocal; use HTML::TokeParser; use GDBM_File; @@ -24,19 +46,305 @@ 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'); + } + } + return OK; +} + sub addrid { my ($current,$new,$condid)=@_; unless ($condid) { $condid=0; } - if (&Apache::lonnet::allowed('bre',$hash{'src_'.$new})) { + if ($current) { - $current.=','.$new.':'.$condid; + $current.=','.$new; } else { - $current=''.$new.':'.$condid; + $current=''.$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 hash_src { + my ($id)=@_; + my ($mapid,$resid)=split(/\./,$id); + my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid}, + $resid,$hash{'src_'.$id}); + my $anchor; + if ($hash{'ext_'.$id} eq 'true:') { + if ($hash{'src_'.$id} =~ /(\#.+)$/) { + $anchor = $1; + } + } + if ($hash{'encrypted_'.$id}) { + return (&Apache::lonenc::encrypted($hash{'src_'.$id}), + &Apache::lonenc::encrypted($symb), + $hash{'encrypted_'.$id},$anchor); + } + return ($hash{'src_'.$id},$symb,$hash{'encrypted_'.$id},$anchor); +} + +sub move { + my ($next,$endupmap,$direction) = @_; + my $safecount=0; + my $allowed=0; + my $deeplinkonly=0; + my $prev=$next; + my ($prevmapid)=split(/\./,$next); + do { + ($next,$endupmap)=&get_next_possible_move($next,$endupmap,$direction); + + my $url = $hash{'src_'.$next}; + my ($mapid,$resid)=split(/\./,$next); + my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid}, + $resid,$url); + if ($url eq '' || $symb eq '') { + $allowed = 0; + } else { + my $priv = &Apache::lonnet::allowed('bre',$url,$symb); + $allowed = (($priv eq 'F') || ($priv eq '2')); + } + $deeplinkonly = 0; + if ($hash{'deeplinkonly_'.$next}) { + my ($value,$level) = split(/:/,$hash{'deeplinkonly_'.$next}); + if ($level eq 'resource') { + $deeplinkonly = 1; + } elsif ($level eq 'map') { + if ($mapid != $prevmapid) { + $deeplinkonly = 1; + } + } + } elsif ($hash{'deeplinkonly_'.$prev}) { + my ($value,$level) = split(/:/,$hash{'deeplinkonly_'.$prev}); + if ($level eq 'resource') { + $deeplinkonly = 1; + } elsif ($level eq 'map') { + if ($mapid != $prevmapid) { + $deeplinkonly = 1; + } + } + } + $safecount++; + } while ( ($next) + && ($next!~/\,/) + && ( + (!$hash{'src_'.$next}) + || ( + (!$env{'request.role.adv'}) + && (($hash{'randomout_'.$next}) + || ($deeplinkonly)) + ) + || (!$allowed) + ) + && ($safecount<10000)); + + return ($next,$endupmap); +} + +sub get_next_possible_move { + my ($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]}}; + } + foreach my $id (split(/\,/,$hash{'to_'.$rid})) { + my $condition= $hash{'conditions_'.$hash{'goesto_'.$id}}; + my $rescond = &Apache::lonnet::docondval($condition); + my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}}); + my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond; + if ($thiscond>=$mincond) { + if ($posnext) { + $posnext.=','.$id.':'.$thiscond; + } else { + $posnext=$id.':'.$thiscond; + } + if ($thiscond>$mincond) { $mincond=$thiscond; } + } + } + foreach my $id (split(/\,/,$posnext)) { + my ($linkid,$condval)=split(/\:/,$id); + if ($condval>=$mincond) { + $next=&addrid($next,$hash{'goesto_'.$linkid}, + $hash{'condid_'.$hash{'undercond_'.$linkid}}); + } + } + if ($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]}}; + } + foreach my $id (split(/\,/,$hash{'from_'.$rid})) { + my $condition= $hash{'conditions_'.$hash{'comesfrom_'.$id}}; + my $rescond = &Apache::lonnet::docondval($condition); + my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}}); + my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond; + if ($thiscond>=$mincond) { + if ($posnext) { + $posnext.=','.$id.':'.$thiscond; + } else { + $posnext=$id.':'.$thiscond; + } + if ($thiscond>$mincond) { $mincond=$thiscond; } + } + } + foreach my $id (split(/\,/,$posnext)) { + my ($linkid,$condval)=split(/\:/,$id); + if ($condval>=$mincond) { + $next=&addrid($next,$hash{'comesfrom_'.$linkid}, + $hash{'condid_'.$hash{'undercond_'.$linkid}}); + } + } + if ($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); +} + +sub first_accessible_resource { + my $furl; + if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db', + &GDBM_READER(),0640)) { + $furl=$hash{'first_url'}; + my %args; + my ($url,$args) = split(/\?/,$furl); + foreach my $pair (split(/\&/,$args)) { + my ($name,$value) = split(/=/,$pair); + $args{&unescape($name)} = &unescape($value); + } + if (!&Apache::lonnet::allowed('bre',$url,$args{'symb'})) { +# Wow, we cannot see this ... move forward to the next one that we can see + my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward'); +# Build the new URL + my ($newmapid,$newresid)=split(/\./,$newrid); + my $symb=&Apache::lonnet::encode_symb($newmap,$newresid,$hash{'src_'.$newrid}); + $furl=&add_get_param($hash{'src_'.$newrid},{ 'symb' => $symb }); + if ($hash{'encrypted_'.$newrid}) { + $furl=&Apache::lonenc::encrypted($furl); + } + } + untie(%hash); + return $furl; + } else { + return '/adm/navmaps'; + } +} + +sub first_answerable_ressymb { + my $navmap = Apache::lonnavmaps::navmap->new; + return unless (ref($navmap)); + my $iterator = $navmap->getIterator(undef,undef,undef,1); + return unless (ref($iterator)); + my ($curRes,$result); + while ($curRes = $iterator->next()) { + if (ref($curRes) && $curRes->is_problem()) { + foreach my $part (@{$curRes->parts()}) { + if ($curRes->tries($part) < $curRes->maxtries($part)) { + $result = $curRes->link().'?symb='.$curRes->shown_symb(); + last; + } + } + } + } + if ($result) { + return $result; + } else { + return &first_accessible_resource(); + } +} + +sub check_http_req { + my ($srcref) = @_; + return unless (ref($srcref) eq 'SCALAR'); + my $usehttp; + if ($env{'request.course.id'}) { + my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'}; + my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'}; + if (($$srcref =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) && + ($ENV{'SERVER_PORT'} == 443) && + ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) { + $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1'; + $usehttp = 1; + } elsif (($$srcref =~ m{^\Q/adm/wrapper/ext/\E(?!https:)}) && + ($ENV{'SERVER_PORT'} == 443)) { + $usehttp = 1; + } + } + return $usehttp; +} + +sub reinited_js { + my ($url,$cid,$timeout) = @_; + if (!$timeout) { + $timeout = 0; + } + return <<"END"; + +END +} + # ================================================================ Main Handler sub handler { @@ -45,99 +353,479 @@ sub handler { # ------------------------------------------- Set document type for header only if ($r->header_only) { - $r->content_type('text/html'); - $r->send_http_header; - return OK; + &Apache::loncommon::content_type($r,'text/html'); + $r->send_http_header; + return OK; } - my %cachehash=(); - my $redirecturl=''; + my %cachehash=(); + my $multichoice=0; + my %multichoicehash=(); + my %prog_state=(); + my ($redirecturl,$redirectsymb,$enc,$anchor,$deeplinklevel); my $next=''; + my $hostname = $r->hostname(); my @possibilities=(); - - if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) { - $ENV{'form.postdata'}=~/(\w+)\:(.*)/; - my $direction=$1; - my $currenturl=$2; - my $redirecturl=$currenturl; - $currenturl=~s/^http\:\/\///; + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']); + if (($env{'form.postdata'})&&($env{'request.course.fn'})) { + my ($direction,$currenturl) = ($env{'form.postdata'}=~/(\w+)\:(.*)/); + if ($currenturl=~m|^/enc/|) { + $currenturl=&Apache::lonenc::unencrypted($currenturl); + } + $currenturl=~s/\.\d+\.(\w+)$/\.$1/; + $currenturl=~s/^https?\:\/\///; $currenturl=~s/^[^\/]+//; + my ($preupdatepos,$last,$reinitcheck); + if ($direction eq 'return') { + if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db', + &GDBM_READER(),0640)) { + $last=$hash{'last_known'}; + untie(%hash); + } + } elsif ($direction eq 'firstanswerable') { + my $furl = &first_answerable_ressymb(); + my $usehttp = &check_http_req(\$furl); + if (($usehttp) && ($hostname ne '')) { + $furl='http://'.$hostname.$furl; + } else { + $furl=&Apache::lonnet::absolute_url().$furl; + } + &Apache::loncommon::content_type($r,'text/html'); + $r->header_out(Location => $furl); + return REDIRECT; + } elsif ($direction eq 'endplacement') { + &Apache::loncommon::content_type($r,'text/html'); + $r->send_http_header; + $r->print(&Apache::lonplacementtest::showresult()); + return OK; + } + if ($env{'request.course.id'}) { + # Check if course needs to be re-initialized + my $loncaparev = $r->dir_config('lonVersion'); + ($reinitcheck,my @reinit) = &Apache::loncommon::needs_coursereinit($loncaparev); + if ($reinitcheck eq 'switch') { + &Apache::loncommon::content_type($r,'text/html'); + $r->send_http_header; + $r->print(&Apache::loncommon::check_release_result(@reinit)); + return OK; + } elsif ($reinitcheck eq 'update') { + my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'}; + my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'}; + $preupdatepos = &Apache::lonnet::symbread($currenturl); + unless ($direction eq 'return') { + if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db', + &GDBM_READER(),0640)) { + $last=$hash{'last_known'}; + untie(%hash); + } + } + &Apache::loncommon::content_type($r,'text/html'); + $r->send_http_header; + $r->print(&Apache::loncommon::start_page('Content Changed')); + my $preamble = '
+$lt{'pick'}: +
+
$lt{'titleheader'} | $lt{'type'} |
---|---|
'. + $multichoicehash{'title_'.$id}. + ' | '.$multichoicehash{'type_'.$id}. + ' |
'.$lt{'expupdate'}.'
'
+ .$lt{'gonav'}.'
'.$lt{'deeplinkres'}.'
'); + } elsif ($deeplinklevel eq 'map') { + $r->print(''.$lt{'deeplinkmap'}.'
'); + } else { + $r->print(''.$lt{'explain'}.'
'); + } + } + } + } + unless (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') || + ($env{'request.role.adv'})) { + if ($deeplinklevel) { + $r->print( + &Apache::lonhtmlcommon::actionbox( + [''.$lt{'back'}.''])); + } elsif ((!@possibilities) && ($reinitcheck)) { + $r->print( + &Apache::lonhtmlcommon::actionbox( + [''.$lt{'nav'}.'' + ])); + } else { + $r->print( + &Apache::lonhtmlcommon::actionbox( + [''.$lt{'back'}.'', + ''.$lt{'nav'}.'' + ])); + } + + } + $r->print(&Apache::loncommon::end_page()); + + return OK; + } + } else { +# ------------------------------------------------- Problem, could not tie hash + if ($reinitcheck eq 'update') { + &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state); + $r->print(&Apache::loncommon::end_page()); + } + $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing"; + return HTTP_NOT_ACCEPTABLE; } + } else { +# ---------------------------------------- No, could not determine where we are + my $newloc = '/adm/ambiguous'; + if ($reinitcheck eq 'update') { + &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state); + $r->print(&reinited_js($newloc,$env{'request.course.id'},100)); + $r->print(&Apache::loncommon::end_page()); + } else { + $r->internal_redirect($newloc); + } + return OK; } -# -------------------------------------------------------- No, could not decide - } - $r->content_type('text/html'); - $r->send_http_header; - - $r->print(''); - -# -------------------------- Class was not initialized or page fliped strangely } else { - $ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course"; +# -------------------------- Class was not initialized or page fliped strangely + $env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course"; return HTTP_NOT_ACCEPTABLE; } +} +1; +__END__ +=pod +=head1 NAME -# ------TRASH BELOW -# --------------------------- TRASH +Apache::lonpageflip - $r->print(''); - return OK; +=head1 SYNOPSIS +Deals with forward, backward, and other page flips. -# ========================================================= TOTAL TRASH +This is part of the LearningOnline Network with CAPA project +described at http://www.lon-capa.org. -# &Apache::lonnet::symblist($requrl,%symbhash); +=head1 OVERVIEW -} +(empty) -1; -__END__ +=head1 SUBROUTINES + +=over cleanup() + +=item addrid() + +=item fullmove() + +=item hash_src() + +=item move() + +=item get_next_possible_move() + +=item first_accessible_resource() + +=item handler() + +=back +=cut