# Automated Enrollment manager
# $Id: Enrollment.pm,v 1.14 2004/03/31 19:31:56 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 LONCAPA::Enrollment;
use Apache::loncoursedata;
use Apache::lonnet;
use Apache::lonmsg;
use HTML::Entities;
use LONCAPA::Configuration;
use Time::Local;
use lib '/home/httpd/lib/perl';
use localenroll;
use strict;
sub update_LC {
my ($dom,$crs,$adds,$drops,$startdate,$enddate,$authtype,$autharg,$classesref,$groupref,$logmsg,$newusermsg,$context) = @_;
# Get current LON-CAPA student enrollment for this class
my $configvars = &LONCAPA::Configuration::read_conf('loncapa.conf');
my $cid = $dom."_".$crs;
my $roster = &Apache::loncoursedata::get_classlist($cid,$dom,$crs);
my $cend = &Apache::loncoursedata::CL_END;
my $cstart = &Apache::loncoursedata::CL_START;
my $stuid=&Apache::loncoursedata::CL_ID;
my $sec=&Apache::loncoursedata::CL_SECTION;
my $status=&Apache::loncoursedata::CL_STATUS;
my $type=&Apache::loncoursedata::CL_TYPE;
my @localstudents = ();
my $currlist;
foreach my $uname (keys %{$roster} ) {
if ($uname =~ m/^(.+):$dom$/) {
if ($$roster{$uname}[$status] eq "Active") {
push @localstudents, $1;
@{$$currlist{$1}} = @{$$roster{$uname}};
}
}
}
my $linefeed = '';
my $addresult = '';
my $dropresult = '';
if ($context eq "updatenow") {
$linefeed = "</li>\n<li>";
} elsif ($context eq "automated") {
$linefeed = "\n";
}
my $enrollcount = 0;
my $dropcount = 0;
srand( time() ^ ($$ + ($$ << 15)) ); # Seed rand in case initial passwords have to be generated for new users.
# Get mapping of IDs to usernames for current LON-CAPA student enrollment for this class
my @LCids = ();
my %unameFromLCid = ();
foreach my $uname (sort keys %{$currlist}) {
my $stuID = $$currlist{$uname}[$stuid];
if (!grep/^$stuID$/,@LCids) {
push @LCids, $stuID;
@{$unameFromLCid{$stuID}} = ();
}
push @{$unameFromLCid{$stuID}},$uname;
}
# Get latest institutional enrollment for this class.
my %allenrolled = ();
my @reg_students = ();
my %place = ();
$place{'autharg'} = &CL_autharg();
$place{'authtype'} = &CL_authtype();
$place{'email'} = &CL_email();
$place{'enddate'} = &CL_enddate();
$place{'firstname'} = &CL_firstname();
$place{'generation'} = &CL_generation();
$place{'groupID'} = &CL_groupID();
$place{'lastname'} = &CL_lastname();
$place{'middlename'} = &CL_middlename();
$place{'startdate'} = &CL_startdate();
$place{'studentID'} = &CL_studentID();
my %ucount = ();
my %enrollinfo = ();
foreach my $class (@{$classesref}) {
my %enrolled = ();
&parse_classlist($$configvars{'lonDaemons'},$dom,$crs,$class,\%place,$$groupref{$class},\%enrolled);
foreach my $uname (sort keys %enrolled ) {
if (!grep/^$uname$/,@reg_students) {
push @reg_students,$uname;
$ucount{$uname} = 0;
@{$allenrolled{$uname}} = ();
}
@{$allenrolled{$uname}[$ucount{$uname}]} = @{$enrolled{$uname}};
$ucount{$uname} ++;
}
}
# Check for multiple sections for a single student
my @okusers = ();
foreach my $uname (@reg_students) {
if (@{$allenrolled{$uname}} > 1) {
my @sections = ();
my $saved;
for (my $i=0; $i<@{$allenrolled{$uname}}; $i++) {
my @stuinfo = @{$allenrolled{$uname}[$i]};
my $secnum = $stuinfo[ $place{'groupID'} ];
unless ($secnum eq '') {
unless (grep/^$secnum$/,@sections) {
$saved = $i;
push @sections,$secnum;
}
}
}
if (@sections == 0) {
@{$enrollinfo{$uname}} = @{$allenrolled{$uname}[0]};
push @okusers, $uname;
}
elsif (@sections == 1) {
@{$enrollinfo{$uname}} = @{$allenrolled{$uname}[$saved]};
push @okusers, $uname;
}
elsif (@sections > 1) {
$$logmsg = "$uname appears in classlists for the more than one section of this course, i.e. in sections: ";
foreach (@sections) {
$$logmsg .= " $_,";
}
chop($$logmsg);
$$logmsg .= ". Because of this ambiguity, no enrollment action was taken for this student.".$linefeed;
}
} else {
@{$enrollinfo{$uname}} = @{$allenrolled{$uname}[0]};
push @okusers, $uname;
}
}
# Get mapping of student IDs to usernames for users in institutional data for this class
my @allINids = ();
my %unameFromINid = ();
foreach my $uname (@okusers) {
$enrollinfo{$uname}[ $place{'studentID'} ] =~ tr/A-Z/a-z/;
my $stuID = $enrollinfo{$uname}[ $place{'studentID'} ];
if (grep/^$stuID$/,@allINids) {
push @{$unameFromINid{$stuID}},$uname;
} else {
push @allINids, $stuID;
@{$unameFromINid{$stuID}} = $uname;
}
}
# Explicitly allow access to creation/modification of students if called as an automated process.
if ($context eq 'automated') {
$ENV{'allowed.cst'}='F';
}
# Compare IDs with existing LON-CAPA enrollment for this class
foreach my $uname (@okusers) {
unless ($uname eq '') {
my %uidhash=&Apache::lonnet::idrget($dom,$uname);
my @stuinfo = @{$enrollinfo{$uname}};
if (grep/^$uname$/,@localstudents) {
# Check for studentID changes
if ( ($uidhash{$uname}) && ($uidhash{$uname} !~ /error\:/) ) {
unless ( ($uidhash{$uname}) eq ($stuinfo[ $place{studentID} ]) ) {
$$logmsg .= "Change in ID for $uname. StudentID in LON-CAPA system is $uidhash{$uname}; StudentID in institutional data is $stuinfo[ $place{studentID} ]".$linefeed;
}
}
# Check for section changes
unless ($$currlist{$uname}[$sec] eq $stuinfo[ $place{groupID} ]) {
if ( ($$currlist{$uname}[$type] eq "auto") && ($adds == 1) ) {
# Delete from roles.db for current section
my $expiretime = time;
my $uurl='/'.$cid;
$uurl=~s/\_/\//g;
if ($$currlist{$uname}[$sec]) {
$uurl.='/'.$$currlist{$uname}[$sec];
}
my $expire_role_result = &Apache::lonnet::assignrole($dom,$uname,$uurl,'st',$expiretime);
if ($expire_role_result eq 'ok') {
my $modify_section_result = &Apache::lonnet::modify_student_enrollment($dom,$uname,undef,undef,undef,undef,undef,$stuinfo[ $place{groupID} ],$$currlist{$uname}[$cend],$$currlist{$uname}[$cstart],'auto',$cid);
if ($modify_section_result =~ /^ok/) {
$$logmsg .= "Section for $uname switched from old section: ".$$currlist{$uname}[$sec] ." to new section: ".$stuinfo[ $place{groupID} ].".".$linefeed;
} else {
$$logmsg .= "Error when attempting section change for $uname from old section ".$$currlist{$uname}[$sec]." to new section: ".$stuinfo[ $place{groupID} ]." -error: $modify_section_result".$linefeed;
}
} else {
$$logmsg .= "Error when attempting to expire role for $uname in old section" .$$currlist{$uname}[$sec]." -error: $expire_role_result".$linefeed;
}
}
}
} else {
# Check for changed usernames by checking studentIDs
if ( ($stuinfo[ $place{studentID} ] ne '') && (grep/^$stuinfo[ $place{studentID} ]$/,@LCids) ) {
if (grep/^$$currlist{$uname}[ $place{'studentID'} ]$/,@allINids) {
foreach my $match ( @{ $unameFromLCid{ $stuinfo[ $place{studentID} ] } } ) {
if (grep/^$match$/,@okusers) {
$$logmsg .= "A possible change in username has been detected for a student enrolled in this course. The existing LON-CAPA classlist contains user: $uname and student ID: ".$$currlist{$uname}[ $place{studentID} ].". This username has been dropped from the institutional classlist, but the same student ID is used for user: $match who still appears in the institutional classlist. You may need to contact your Domain Coordinator to request a move of the student data files for user: $uname to $match".$linefeed;
}
}
}
} elsif ($adds == 1) {
# Add student to LON-CAPA classlist
my $auth = $stuinfo[ $place{'authtype'} ];
my $authparam = $stuinfo[ $place{'autharg'} ];
my $first = $stuinfo[ $place{'firstname'} ];
my $middle = $stuinfo[ $place{'middlename'} ];
my $last = $stuinfo[ $place{'lastname'} ];
my $gene = $stuinfo[ $place{'generation'} ];
my $usec = $stuinfo[ $place{'groupID'} ];
my $end = $stuinfo[ $place{'enddate'} ];
my $start = $stuinfo[ $place{'startdate'} ];
my $emailaddr = $stuinfo[ $place{'email'} ];
my $pid = $stuinfo[ $place{'studentID'} ];
# remove non alphanumeric values from section
$usec =~ s/\W//g;
unless ($emailaddr =~/^[^\@]+\@[^\@]+$/) { $emailaddr =''; }
my $emailenc = &HTML::Entities::encode($emailaddr,'<>&"');
# Use course defaults where entry is absent
if ( ($auth eq '') || (!defined($auth)) ) {
$auth = $authtype;
}
if ( ($authparam eq '') || (!defined($authparam)) ) {
$authparam = $autharg;
}
if ( ($end eq '') || (!defined($end)) ) {
$end = $enddate;
}
if ( ($start eq '') || (!defined($start)) ) {
$start = $startdate;
}
# Clean up whitespace
foreach (\$dom,\$uname,\$pid,\$first,\$middle,\$last,\$gene,\$usec) {
$$_ =~ s/(\s+$|^\s+)//g;
}
# Check for existing account in this LON-CAPA domain for this username
my $uhome=&Apache::lonnet::homeserver($uname,$dom);
if ($uhome eq 'no_host') { # User does not exist
my $create_passwd = 0;
my $authchk = '';
unless ($authparam eq '') { $authchk = 'ok'; };
# If no account exists and passwords should be generated
if ($auth eq "internal") {
if ($authparam eq '') {
($authparam) = &create_password();
if ($authparam eq '') {
$authchk = '';
} else {
$create_passwd = 1;
$authchk = 'ok';
}
}
} elsif ($auth eq "localauth") {
($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam);
} elsif ($auth =~ m/^krb/) {
if ($authparam eq '') {
$$logmsg .= "No Kerberos domain was provided for the new user - $uname, so the new student was not enrolled in the course.".$linefeed;
$authchk = 'invalid';
}
} else {
$authchk = 'invalid';
$$logmsg .= "An invalid authentication type was provided for the new user - $uname, so the student was not enrolled in the course.".$linefeed;
}
if ($authchk eq 'ok') {
# Now create user.
my $reply=&Apache::lonnet::modifystudent($dom,$uname,$pid,$auth,$authparam,$first,$middle,$last,$gene,$usec,$end,$start,'',undef,$emailaddr,'auto',$cid);
if ($reply eq 'ok') {
$enrollcount ++;
$addresult .= "$first $last ($pid) - $uname enrolled in section/group $usec.".$linefeed;
if ($context eq 'automated') {
$$logmsg .= "New $dom user $uname added successfully.";
}
unless ($emailenc eq '') {
my %emailHash;
$emailHash{'critnotification'} = $emailenc;
$emailHash{'notification'} = $emailenc;
my $putresult = &Apache::lonnet::put('environment',\%emailHash,$dom,$uname);
}
if ($create_passwd) {
# Send e-mail with initial password to new user at $emailaddr.
# If e-mail address is invalid, send password via message to courseowner i
# (if automated call) or to user if roster update.
if ($emailaddr eq '') {
$$newusermsg .= " username: $uname, password: ".$authparam.$linefeed."\n";
} else {
my $subject = "New LON-CAPA account";
my $body = "You have been enrolled in the LON-CAPA system at your school, because you are a registered student in a class that is using the LON-CAPA course management and online homework system.\n\nYou should log-in to the system using the following credentials:\nusername: $uname\npassword: $authparam\n\nThe URL you should use to access the LON-CAPA system at your school is: http://".$ENV{'SERVER_NAME'};
&Apache::lonmsg::sendemail($emailaddr,$subject,$body);
}
if ($context eq 'automated') {
$$logmsg .= " Initial password - - sent to ".$emailaddr.$linefeed;
}
} else {
if ($context eq 'automated') {
$$logmsg .= $linefeed;
}
}
} else {
$$logmsg .= "An error occurred adding new user $uname - ".$reply.$linefeed;
}
}
} else {
# Get the user's information and authentication
my %userenv = &Apache::lonnet::get('environment',['firstname','middlename','lastname','generation','id','critnotification','notification'],$dom,$uname);
my ($tmp) = keys(%userenv);
if ($tmp =~ /^(con_lost|error)/i) {
%userenv = ();
}
# Get the user's e-mail address
if ($userenv{critnotification} =~ m/%40/) {
unless ($emailenc eq $userenv{critnotification}) {
$$logmsg .= "Current critical notification e-mail - ".$userenv{critnotification}." for $uname is different to e-mail address in Institutional classlist - ".$emailenc.$linefeed;
}
}
if ($userenv{notification} =~ m/%40/) {
unless ($emailenc eq $userenv{critnotification}) {
$$logmsg .= "Current standard notification e-mail - ".$userenv{notification}." for $uname is different to e-mail address in institutional classlist - ".$emailenc.$linefeed;
}
}
my $krbdefdom = '';
my $currentauth=&Apache::lonnet::queryauthenticate($uname,$dom);
if ($currentauth=~/^(krb[45]):(.*)/) {
$currentauth = $1;
$krbdefdom = $2;
} elsif ($currentauth=~ /^(unix|internal|localauth):/) {
$currentauth = $1;
} else {
$$logmsg .= "Invalid authentication method $currentauth for $uname.".$linefeed;
}
# Report if authentication methods are different.
if ($currentauth ne $auth) {
$$logmsg .= "Authentication type mismatch for $uname - '$currentauth' in system, '$auth' based on information in classlist or default for this course.".$linefeed;
} elsif ($auth =~ m/^krb/) {
if ($krbdefdom ne $authparam) {
$$logmsg .= "Kerberos domain mismatch for $uname - '$krbdefdom' in system, '$authparam' based on information in classlist or default for this course.".$linefeed;
}
}
# Check user data
if ($first ne $userenv{'firstname'} ||
$middle ne $userenv{'middlename'} ||
$last ne $userenv{'lastname'} ||
$gene ne $userenv{'generation'} ||
$pid ne $userenv{'id'} ) {
# Make the change(s)
my %changeHash;
$changeHash{'firstname'} = $first;
$changeHash{'middlename'} = $middle;
$changeHash{'lastname'} = $last;
$changeHash{'generation'} = $gene;
$changeHash{'id'} = $pid;
my $putresult = &Apache::lonnet::put('environment',\%changeHash,$dom,$uname);
if ($putresult eq 'ok') {
$$logmsg .= "User information updated for user: $uname prior to enrollment.".$linefeed;
} else {
$$logmsg .= "There was a problem modifying user data for existing user - $uname -error: $putresult, enrollment will still be attempted.".$linefeed;
}
}
# Assign the role of student in the course.
my $classlist_reply = &Apache::lonnet::modify_student_enrollment($dom,$uname,$pid,$first,$middle,$last,$gene,$usec,$end,$start,'auto',$cid);
if ($classlist_reply eq 'ok') {
$enrollcount ++;
$addresult .= "$first $last ($pid) - $uname enrolled in section/group $usec.".$linefeed;
if ($context eq 'automated') {
$$logmsg .= "Existing $dom user $uname enrolled successfully.".$linefeed;
}
} else {
$$logmsg .= "There was a problem updating the classlist db file for user $uname to show the new enrollment -error: $classlist_reply, so no enrollment occurred for this user.".$linefeed;
}
}
}
}
}
}
# Do drops
if ( ($drops == 1) && (@reg_students > 0) ) {
foreach my $uname (@localstudents) {
if ($$currlist{$uname}[$type] eq "auto") {
my @saved = ();
if (!grep/^$uname$/,@reg_students) {
# Check for changed usernames by checking studentIDs
if (grep/^$$currlist{$uname}[ $stuid ]$/,@allINids) {
foreach my $match (@{$unameFromINid{$$currlist{$uname}[ $stuid ]}} ) {
$$logmsg .= "A possible change in username has been detected for a student enrolled in this course. The existing LON-CAPA classlist contains user: $uname and student ID: $$currlist{$uname}[ $place{studentID} ]. This username has been dropped from the institutional classlist, but the same student ID is used for user: $match who still appears in the institutional classlist. You may need to move the student data files for user: $uname to $match.".$linefeed;
push @saved,$uname;
}
} elsif (@saved == 0) {
my $drop_reply = &Apache::lonnet::modifystudent($dom,$uname,'','','',undef,undef,undef,undef,$$currlist{$uname}[$sec],time,undef,undef,undef,undef,undef,$cid);
if ($drop_reply !~ /^ok/) {
$$logmsg .= "An error occured during the attempt to expire the $uname from the old section $$currlist{$uname}[$sec] - $drop_reply.".$linefeed;
} else {
$dropcount ++;
my %userenv = &Apache::lonnet::get('environment',['firstname','lastname','id'],$dom,$uname);
$dropresult .= $userenv{'firstname'}." ".$userenv{'lastname'}." (".$userenv{'id'}.") - ".$uname." dropped from section/group ".$$currlist{$uname}[$sec].$linefeed;
if ($context eq 'automated') {
$$logmsg .= "User $uname student role expired from course.".$linefeed;
}
}
}
}
}
}
}
# Terminated explictly allowed access to student creation/modification
if ($context eq 'automated') {
delete($ENV{'allowed.cst'});
}
if ($enrollcount > 0) {
if ($context eq "updatenow") {
$addresult = substr($addresult,0,rindex($addresult,"<li>"));
$addresult = "The following $enrollcount student(s) was/were added to this LON-CAPA course:<br/><ul><li>".$addresult."</li></ul><br/><br/>";
} else {
$addresult = "The following $enrollcount student(s) was/were added to this LON-CAPA course:\n\n".$addresult."\n\n";
}
}
if ($dropcount > 0) {
if ($context eq "updatenow") {
$dropresult = substr($dropresult,0,rindex($dropresult,"<li>"));
$dropresult = "The following $dropcount student(s) was/were expired from this LON-CAPA course:<br/><ul><li>".$dropresult."</li></ul><br/><br/>";
} else {
$dropresult = "The following $dropcount student(s) was/were expired from this LON-CAPA course:\n\n".$dropresult."\n\n";
}
}
if ( ($adds) && ($enrollcount == 0) ) {
$addresult = "There were no new students to add to the course.";
if ($context eq "updatenow") {
$addresult .="<br/><br/>";
} else {
$addresult .="\n";
}
}
if ( ($drops) && ($dropcount == 0) ) {
$dropresult = "There were no students with roles to expire because all active students previously added to the course from institutional classlist(s) are still officially registered.";
if ($context eq "updatenow") {
$dropresult .="<br/>";
} else {
$dropresult .="\n";
}
}
my $changecount = $enrollcount + $dropcount;
return ($changecount,$addresult.$dropresult);
}
sub parse_classlist {
my ($tmpdir,$dom,$crs,$class,$placeref,$groupID,$studentsref) = @_;
my $xmlfile = $tmpdir."/tmp/".$dom."_".$crs."_".$class."_classlist.xml";
my $uname = '';
my @state;
my @items = ('autharg','authtype','email','firstname','generation','lastname','middlename','studentID');
my $p = HTML::Parser->new
(
xml_mode => 1,
start_h =>
[sub {
my ($tagname, $attr) = @_;
push @state, $tagname;
if ("@state" eq "students student") {
$uname = $attr->{username};
}
}, "tagname, attr"],
text_h =>
[sub {
my ($text) = @_;
if ("@state" eq "students student groupID") {
$$studentsref{$uname}[ $$placeref{'groupID'} ] = $groupID;
} elsif ("@state" eq "students student startdate") {
my $start = $text;
unless ($text eq '') {
$start = &process_date($text);
}
$$studentsref{$uname}[ $$placeref{'startdate'} ] = $start;
} elsif ("@state" eq "students student enddate") {
my $end = $text;
unless ($text eq '') {
$end = &process_date($text);
}
$$studentsref{$uname}[ $$placeref{'enddate'} ] = $end;
} else {
foreach my $item (@items) {
if ("@state" eq "students student $item") {
$$studentsref{$uname}[ $$placeref{$item} ] = $text;
}
}
}
}, "dtext"],
end_h =>
[sub {
my ($tagname) = @_;
pop @state;
}, "tagname"],
);
$p->parse_file($xmlfile);
$p->eof;
if (-e "$xmlfile") {
unlink $xmlfile;
}
return;
}
sub process_date {
my $timestr = shift;
my $timestamp = '';
if ($timestr =~ m/^\d{4}:\d{2}:\d{2}/) {
my @entries = split/:/,$timestr;
for (my $j=0; $j<@entries; $j++) {
if ( length($entries[$j]) > 1 ) {
$entries[$j] =~ s/^0//;
}
}
$entries[1] = $entries[1] - 1;
$timestamp = timelocal($entries[5],$entries[4],$entries[3],$entries[2],$entries[1],$entries[0]);
}
return $timestamp;
}
sub create_password {
my $passwd = '';
my @letts = ("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");
for (my $i=0; $i<8; $i++) {
my $lettnum = int (rand 2);
my $item = '';
if ($lettnum) {
$item = $letts[int( rand(26) )];
my $uppercase = int(rand 2);
if ($uppercase) {
$item =~ tr/a-z/A-Z/;
}
} else {
$item = int( rand(10) );
}
$passwd .= $item;
}
return ($passwd);
}
sub check_user_status {
my ($udom,$uname,$cdom,$crs,$role,$secgrp) = @_;
my %userinfo = &Apache::lonnet::dump('roles',$udom,$uname);
my @uroles = keys %userinfo;
my $srchstr;
my $active_chk = 'none';
if (@uroles > 0) {
if ( ($role eq 'cc') || ($secgrp eq '') || ( !defined($secgrp) ) ) {
$srchstr = '/'.$cdom.'/'.$crs.'_'.$role;
} else {
$srchstr = '/'.$cdom.'/'.$crs.'/'.$secgrp.'_'.$role;
}
if (grep/^$srchstr$/,@uroles) {
my $role_end = 0;
my $role_start = 0;
$active_chk = 'ok';
if ( $userinfo{$srchstr} =~ m/^($role)_(\d+)/ ) {
$role_end = $2;
if ( $userinfo{$srchstr} =~ m/^($role)_($role_end)_(\d+)$/ )
{
$role_start = $3;
}
}
if ($role_start > 0) {
if (time < $role_start) {
$active_chk = 'expired';
}
}
if ($role_end > 0) {
if (time > $role_end) {
$active_chk = 'expired';
}
}
}
}
return $active_chk;
}
sub CL_autharg { return 0; }
sub CL_authtype { return 1;}
sub CL_email { return 2;}
sub CL_enddate { return 3;}
sub CL_firstname { return 4;}
sub CL_generation { return 5;}
sub CL_groupID { return 6;}
sub CL_lastname { return 7;}
sub CL_middlename { return 8;}
sub CL_startdate { return 9; }
sub CL_studentID { return 10; }
1;
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