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[LON-CAPA] /
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lonpageflip.pm
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Sat Apr 12 16:03:16 2003 UTC (21 years, 7 months ago) by
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CVS tags:
version_0_99_5,
version_0_99_4,
version_0_99_3,
version_0_99_2,
version_0_99_1,
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Link logging, and installation of managekeys handler.
# The LearningOnline Network with CAPA
#
# Page flip handler
#
# $Id: lonpageflip.pm,v 1.38 2003/04/12 16:03:16 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
#
# 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)
#
# 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 REDIRECT);
use Apache::lonnet();
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');
}
}
}
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 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 {
my $r=shift;
# ------------------------------------------- Set document type for header only
if ($r->header_only) {
$r->content_type('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=$2;
if ($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($currenturl)) {
# ------------------------------------------------------------------------- Yes
my ($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_'.&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);
# --------------------------------------------------------- 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 ($redirecturl) {
# ----------------------------------------------------- There is a URL to go to
if ($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);
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(<<ENDSTART);
<head><title>Choose Next Location</title></head>
$bodytag
<h3>There are several possibilities of where to go next</h3>
<p>
Please click on the the resource you intend to access:
<p>
<table border=2>
<tr><th>Title</th><th>Type</th></tr>
ENDSTART
foreach (@possibilities) {
$r->print(
'<tr><td><a href="'.
$multichoicehash{'src_'.$_}.'?symb=' .
Apache::lonnet::escape($multichoicehash{'symb_'.$_}).'">'.
$multichoicehash{'title_'.$_}.
'</a></td><td>'.$multichoicehash{'type_'.$_}.
'</td></tr>');
}
$r->print('</table></body></html>');
return OK;
} else {
my $bodytag=&Apache::loncommon::bodytag('No Resource');
$r->print(<<ENDNONE);
<head><title>No Resource</title></head>
$bodytag
<h3>Next resource could not be identified.</h3>
<p>You probably are at the <b>beginning</b> or the <b>end</b> of the
course.</p>
<ul>
<li><a href="/adm/flip?postdata=return:">Go Back</a></li>
<li><a href="/adm/navmaps">Navigate Course Content</a></li>
</ul>
</body>
</html>
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, could not determine where we are
$r->internal_redirect('/adm/ambiguous');
}
} 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__
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