# The LearningOnline Network with CAPA
#
# Page flip handler
#
# $Id: lonpageflip.pm,v 1.114 2022/10/29 18:13:29 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/
#
package Apache::lonpageflip;
use strict;
use LONCAPA;
use Apache::Constants qw(:common :http REDIRECT);
use Apache::lonnet;
use Apache::loncommon();
use Apache::lonnavmaps();
use Apache::lonuserstate;
use Apache::lonlocal;
use HTML::TokeParser;
use GDBM_File;
# ========================================================== Module Global Hash
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) { $condid=0; }
if ($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 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,$firstres) = @_;
my $safecount=0;
my $allowed=0;
my $deeplinkonly=0;
my $deeplinkchecked;
my $deeplink_login_pc;
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 $nodeeplinkcheck = 0;
if ($hash{'is_map_'.$next}) {
$nodeeplinkcheck = 1;
}
my $priv = &Apache::lonnet::allowed('bre',$url,$symb,'','','','',$nodeeplinkcheck);
$allowed = (($priv eq 'F') || ($priv eq '2') || ($priv eq 'A'));
}
$deeplinkonly = 0;
if ($hash{'deeplinkonly_'.$next}) {
my ($value,$level) = map { &unescape($_); } split(/:/,$hash{'deeplinkonly_'.$next});
my ($state,$others,$listed,$scope,$protect) = split(/,/,$value);
unless (($state eq 'both') || ($hash{'is_map_'.$next})) {
if ($level eq 'resource') {
$deeplinkonly = 1;
} elsif ($level eq 'map') {
if ($scope eq 'rec') {
unless ($mapid == $prevmapid) {
unless ($deeplinkchecked) {
$deeplink_login_pc = &get_deeplink_login_pc();
$deeplinkchecked = 1;
}
if ($deeplink_login_pc) {
my $poss_map_pc;
if ($hash{'is_map_'.$next}) {
$poss_map_pc = $hash{'map_pc_'.$url};
} else {
$poss_map_pc = $hash{'map_pc_'.$hash{'map_id_'.$mapid}};
}
unless ($deeplink_login_pc == $poss_map_pc) {
unless (grep(/^$deeplink_login_pc$/,split(/,/,$hash{'map_hierarchy_'.$poss_map_pc}))) {
$deeplinkonly = 1;
}
}
} else {
$deeplinkonly = 1;
}
}
} elsif ($mapid != $prevmapid) {
$deeplinkonly = 1;
}
}
}
} elsif (($hash{'deeplinkonly_'.$prev}) && (!$firstres)) {
my ($value,$level) = map { &unescape($_); } split(/:/,$hash{'deeplinkonly_'.$prev});
my ($state,$others,$listed,$scope,$protect) = split(/,/,$value);
unless (($state eq 'both') || ($hash{'is_map_'.$prev})) {
if ($level eq 'resource') {
$deeplinkonly = 1;
} elsif ($level eq 'map') {
if ($scope eq 'rec') {
unless ($mapid == $prevmapid) {
unless ($deeplinkchecked) {
$deeplink_login_pc = &get_deeplink_login_pc();
$deeplinkchecked = 1;
}
if ($deeplink_login_pc) {
my $poss_map_pc;
if ($hash{'is_map_'.$prev}) {
$poss_map_pc = $hash{'map_pc_'.$url};
} else {
$poss_map_pc = $hash{'map_pc_'.$hash{'map_id_'.$mapid}};
}
unless ($deeplink_login_pc == $poss_map_pc) {
unless (grep(/^$deeplink_login_pc$/,split(/,/,$hash{'map_hierarchy_'.$poss_map_pc}))) {
$deeplinkonly = 1;
}
}
}
}
} else {
if ($mapid != $prevmapid) {
$deeplinkonly = 1;
}
}
}
}
}
$safecount++;
} while ( ($next)
&& ($next!~/\,/)
&& (
(!$hash{'src_'.$next})
|| (
(!$env{'request.role.adv'})
&& (($hash{'randomout_'.$next})
|| ($deeplinkonly)
|| ($hash{'deeplinkout_'.$next}))
)
|| (!$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,$url,$argstr);
if ($furl =~ m{^/enc/}) {
($url,$argstr) = split(/\?/,&Apache::lonenc::unencrypted($furl));
} else {
($url,$argstr) = split(/\?/,$furl);
}
foreach my $pair (split(/\&/,$argstr)) {
my ($name,$value) = split(/=/,$pair);
$args{&unescape($name)} = &unescape($value);
}
my $priv = &Apache::lonnet::allowed('bre',$url,$args{'symb'});
my $allowed = (($priv eq 'F') || ($priv eq '2') || ($priv eq 'A'));
if (!$allowed) {
# Wow, we cannot see this ... move forward to the next one that we can see
my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward',1);
# Build the new URL
if ($newrid eq '') {
$furl = '/adm/navmaps';
} else {
my ($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,$hostname) = @_;
return unless (ref($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 (($$srcref =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) &&
($ENV{'SERVER_PORT'} == 443) &&
($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
unless ((&Apache::lonnet::uses_sts()) ||
(&Apache::lonnet::waf_allssl($hostname))) {
$$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
$usehttp = 1;
}
} elsif (($$srcref =~ m{^\Q/adm/wrapper/ext/\E(?!https:)}) &&
($ENV{'SERVER_PORT'} == 443)) {
unless ((&Apache::lonnet::uses_sts()) ||
(&Apache::lonnet::waf_allssl($hostname))) {
my ($url,$anchor) = ($$srcref =~ /^([^\#]+)(?:|(\#[^\#]+))$/);
$$srcref = $url . (($$srcref =~/\?/)? '&':'?') . 'usehttp=1' .$anchor;
$usehttp = 1;
}
}
}
return $usehttp;
}
sub reinited_js {
my ($url,$cid,$timeout) = @_;
if (!$timeout) {
$timeout = 0;
}
return <<"END";
<script type="text/javascript">
// <![CDATA[
setTimeout(function() {
var newurl = '$url';
if (document.getElementById('LC_update_$cid')) {
document.getElementById('LC_update_$cid').style.display = 'none';
}
if ((newurl !== null) && (newurl !== '') && (newurl !== 'undefined')) {
window.location.href = "$url";
}
}, $timeout);
// ]]>
</script>
END
}
sub get_deeplink_login_pc {
my $deeplink_login_pc;
if (($env{'request.deeplink.login'}) && ($env{'request.course.id'})) {
my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
my $deeplink_symb = &Apache::loncommon::deeplink_login_symb($cnum,$cdom);
if ($deeplink_symb) {
my $loginmap;
if ($deeplink_symb =~ /\.(page|sequence)$/) {
$loginmap = &Apache::lonnet::clutter((&Apache::lonnet::decode_symb($deeplink_symb))[2]);
} else {
$loginmap = &Apache::lonnet::clutter((&Apache::lonnet::decode_symb($deeplink_symb))[0]);
}
$deeplink_login_pc = $hash{'map_pc_'.$loginmap};
}
}
return $deeplink_login_pc;
}
# ================================================================ 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 $multichoice=0;
my %multichoicehash=();
my %prog_state=();
my ($redirecturl,$redirectsymb,$enc,$anchor,$deeplinklevel);
my $next='';
my $hostname = $r->hostname();
my @possibilities=();
&Apache::loncommon::get_unprocessed_cgi($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 $usehttp = &check_http_req(\$furl,$hostname);
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;
$r->print(&Apache::loncommon::check_release_result(@reinit));
return OK;
}
my ($cnum,$cdom);
if ($reinitcheck) {
$cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
$cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
}
if (($reinitcheck eq 'main') || ($reinitcheck eq 'both')) {
$preupdatepos = &Apache::lonnet::symbread($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 $preamble = '<div id="LC_update_'.$env{'request.course.id'}.'" class="LC_info">'.
'<br />'.
&mt('Your course session is being updated because of recent changes by course personnel.').
' '.&mt('Please be patient').'.<br /></div>'.
'<div style="padding:0;clear:both;margin:0;border:0"></div>';
%prog_state = &Apache::lonhtmlcommon::Create_PrgWin($r,undef,$preamble);
&Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Updating course'));
my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
&Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished!'));
if ($ferr) {
&Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
my $requrl = $r->uri;
$env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
$env{'user.reinit'} = 1;
return HTTP_NOT_ACCEPTABLE;
} else {
if ($last) {
my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
unless (&Apache::lonnet::symbverify($last,$fn)) {
undef($last);
}
}
}
}
if (($reinitcheck eq 'both') || ($reinitcheck eq 'supp')) {
my $possdel;
if ($reinitcheck eq 'supp') {
$possdel = 1;
}
my ($supplemental,$refs_updated) = &Apache::loncommon::get_supplemental($cnum,$cdom,'',$possdel);
unless ($refs_updated) {
&Apache::loncommon::set_supp_httprefs($cnum,$cdom,$supplemental);
}
}
}
if ($direction eq 'firstres') {
my $furl=&first_accessible_resource();
my $usehttp = &check_http_req(\$furl,$hostname);
if (($usehttp) && ($hostname ne '')) {
$furl='http://'.$hostname.$furl;
} else {
$furl=&Apache::lonnet::absolute_url().$furl;
}
if ($reinitcheck eq 'update') {
&Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
$r->print(&reinited_js($furl,$env{'request.course.id'},100));
$r->print(&Apache::loncommon::end_page());
return OK;
} else {
&Apache::loncommon::content_type($r,'text/html');
$r->header_out(Location => $furl);
return REDIRECT;
}
}
if ($direction eq 'return') {
# -------------------------------------------------------- Return to last known
my ($newloc,$usehttp);
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) {
$usehttp = &check_http_req(\$newloc,$hostname);
if ($hash{'encrypted_'.$id}) {
$newloc=&Apache::lonenc::encrypted($newloc);
}
if ($newloc =~ m{^(/adm/wrapper/ext/[^\#]+)(?:|(\#[^\#]+))$}) {
my ($url,$anchor) = ($1,$2);
if ($anchor) {
$newloc = $url.(($url=~/\?/)?'&':'?').'symb='.&escape($last).$anchor;
}
}
} else {
$newloc='/adm/navmaps';
}
untie %hash;
} else {
$newloc='/adm/navmaps';
}
if (($usehttp) && ($hostname ne '')) {
$newloc='http://'.$hostname.$newloc;
} else {
$newloc=&Apache::lonnet::absolute_url().$newloc
}
if ($reinitcheck eq 'update') {
$r->print(&reinited_js($newloc,$env{'request.course.id'},100));
$r->print(&Apache::loncommon::end_page());
return OK;
} else {
&Apache::loncommon::content_type($r,'text/html');
$r->header_out(Location => $newloc);
return REDIRECT;
}
}
#
# Is the current URL on the map? If not, start with last known URL
#
unless (&Apache::lonnet::is_on_map($currenturl)) {
if ($preupdatepos) {
undef($preupdatepos);
} elsif (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 {
my $newloc = &Apache::lonnet::absolute_url().
'/adm/navmaps';
if ($reinitcheck eq 'update') {
&Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
$r->print(&reinited_js($newloc,$env{'request.course.id'},100));
$r->print(&Apache::loncommon::end_page());
return OK;
} else {
&Apache::loncommon::content_type($r,'text/html');
$r->header_out(Location => $newloc);
return REDIRECT;
}
}
}
# ------------------------------------------- Do we have any idea where we are?
my $position;
if ($preupdatepos) {
$position = $preupdatepos;
} else {
$position=Apache::lonnet::symbread($currenturl);
}
if ($position) {
# ------------------------------------------------------------------------- Yes
my ($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?
# 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,$redirectsymb,$enc,$anchor)=&hash_src($next);
$cachehash{$endupmap}{$redirecturl}=
[$redirecturl,(split(/\./,$next))[1]];
} else {
# ------------------------ There are multiple possibilities for a next resource
$multichoice=1;
foreach my $id (@possibilities) {
$multichoicehash{'src_'.$id}=$hash{'src_'.$id};
$multichoicehash{'title_'.$id}=$hash{'title_'.$id};
$multichoicehash{'type_'.$id}=$hash{'type_'.$id};
(my $first, my $second) = $id =~ /(\d+).(\d+)/;
my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id});
$multichoicehash{'symb_'.$id} =
Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
$second.'___'.$symbSrc);
my ($choicemap,$choiceres)=split(/\./,$id);
my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap});
my $url=$multichoicehash{'src_'.$id};
$cachehash{$map}{$url}=[$url,$choiceres];
}
}
} else {
# -------------------------------------------------------------- No place to go
$multichoice=-1;
if ($position && $env{'request.deeplink.login'}) {
my ($map,$resid,$url) = &Apache::lonnet::decode_symb($position);
my $mapid = $hash{'map_pc_'.&Apache::lonnet::clutter($map)};
my $position_deeplink = $hash{'deeplinkonly_'.$mapid.'.'.$resid};
if ($position_deeplink) {
(my $value,$deeplinklevel) = map { &unescape($_); }
split(/:/,$position_deeplink);
}
}
}
# ----------------- The program must come past this point to untie the big hash
untie(%hash);
# --------------------------------------------------------- Store position info
$cachehash{$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 ($redirecturl) {
# ----------------------------------------------------- There is a URL to go to
if ($direction eq 'forward') {
&Apache::lonnet::linklog($currenturl,$redirecturl);
}
if ($direction eq 'back') {
&Apache::lonnet::linklog($redirecturl,$currenturl);
}
# ------------------------------------- Check for and display critical messages
my ($redirect, $url) = &Apache::loncommon::critical_redirect(300,'flip');
unless ($redirect) {
my $usehttp = &check_http_req(\$redirecturl,$hostname);
if (($usehttp) && ($hostname ne '')) {
$url='http://'.$hostname.$redirecturl;
} else {
$url=&Apache::lonnet::absolute_url().$redirecturl;
}
my $addanchor;
if (($anchor ne '') && (!$enc || $env{'request.role.adv'})) {
$addanchor = 1;
$url =~ s/\#.+$//;
}
$url = &add_get_param($url, { 'symb' => $redirectsymb});
if ($addanchor) {
$url .= $anchor;
}
}
if ($reinitcheck eq 'update') {
&Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
$r->print(&reinited_js($url,$env{'request.course.id'},100));
$r->print(&Apache::loncommon::end_page());
return OK;
} else {
&Apache::loncommon::content_type($r,'text/html');
$r->header_out(Location => $url);
return REDIRECT;
}
} else {
# --------------------------------------------------------- There was a problem
&Apache::loncommon::content_type($r,'text/html');
$r->send_http_header;
my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence',
'deeplink' => 'No link available',
'deeplinkres' =>
'Navigation to other content is unavailable when accessing content via deep-linking',
'deeplinkmap' =>
'You have reached the end of the sequence of available materials for access via deep-linking',
'explain' =>
'You have reached the end of the sequence of materials.',
'back' => 'Go Back',
'nav' => 'Course Contents',
'wherenext' =>
'There are several possibilities of where to go next',
'pick' =>
'Please click on the the resource you intend to access',
'titleheader' => 'Title',
'type' => 'Type',
'update' => 'Content updated',
'expupdate' => 'As a result of a recent update to the sequence of materials, it is not possible to complete the page flip.',
'gonav' => 'Go to the Contents page to select a resource to display.',
);
if (&Apache::loncommon::course_type() eq 'Community') {
$lt{'nav'} = &mt('Community Contents');
}
if ($#possibilities>0) {
my $start_page=
&Apache::loncommon::start_page('Multiple Resources');
$r->print(<<ENDSTART);
$start_page
<h3>$lt{'wherenext'}</h3>
<p>
$lt{'pick'}:
<p>
<table border="2">
<tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
ENDSTART
foreach my $id (@possibilities) {
my $src = $multichoicehash{'src_'.$id};
my $usehttp = &check_http_req(\$src,$hostname);
if (($usehttp) && ($hostname ne '')) {
$src = 'http://'.$hostname.$src;
}
$r->print(
'<tr><td><a href="'.
&add_get_param($src,
{'symb' =>
$multichoicehash{'symb_'.$id},
}).'">'.
$multichoicehash{'title_'.$id}.
'</a></td><td>'.$multichoicehash{'type_'.$id}.
'</td></tr>');
}
$r->print('</table>');
} else {
if ($reinitcheck) {
if (&Apache::loncommon::course_type() eq 'Community') {
$r->print(
&Apache::loncommon::start_page('Community Contents Updated'));
} else {
$r->print(
&Apache::loncommon::start_page('Course Contents Updated'));
}
$r->print('<h2>'.$lt{'update'}.'</h2>'
.'<p>'.$lt{'expupdate'}.'<br />'
.$lt{'gonav'}.'</p>');
} else {
if (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
(!$env{'request.role.adv'})) {
my ($score,$incomplete) = &Apache::lonplacementtest::check_completion(undef,undef,1);
if ($incomplete) {
$r->print(&Apache::lonplacementtest::showincomplete($incomplete));
} else {
$r->print(&Apache::lonplacementtest::showresult(1));
}
} else {
$r->print(
&Apache::loncommon::start_page('No Resource'));
if ($deeplinklevel eq 'resource') {
$r->print('<h2>'.$lt{'deeplink'}.'</h2>'
.'<p>'.$lt{'deeplinkres'}.'</p>');
} elsif ($deeplinklevel eq 'map') {
$r->print('<h2>'.$lt{'title'}.'</h2>'
.'<p>'.$lt{'deeplinkmap'}.'</p>');
} else {
$r->print('<h2>'.$lt{'title'}.'</h2>'
.'<p>'.$lt{'explain'}.'</p>');
}
}
}
}
unless (($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') &&
(!$env{'request.role.adv'})) {
if ($deeplinklevel) {
$r->print(
&Apache::lonhtmlcommon::actionbox(
['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a>']));
} elsif ((!@possibilities) && ($reinitcheck)) {
$r->print(
&Apache::lonhtmlcommon::actionbox(
['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
]));
} else {
$r->print(
&Apache::lonhtmlcommon::actionbox(
['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
'<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
]));
}
}
$r->print(&Apache::loncommon::end_page());
return OK;
}
} else {
# ------------------------------------------------- Problem, could not tie hash
if ($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;
}
} else {
# -------------------------- 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
Apache::lonpageflip
=head1 SYNOPSIS
Deals with forward, backward, and other page flips.
This is part of the LearningOnline Network with CAPA project
described at http://www.lon-capa.org.
=head1 OVERVIEW
(empty)
=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
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