# The LearningOnline Network
# TCP networking package
#
# $Id: lonnet.pm,v 1.338 2003/03/14 02:26:12 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/
#
# 6/1/99,6/2,6/10,6/11,6/12,6/14,6/26,6/28,6/29,6/30,
# 7/1,7/2,7/9,7/10,7/12,7/14,7/15,7/19,
# 11/8,11/16,11/18,11/22,11/23,12/22,
# 01/06,01/13,02/24,02/28,02/29,
# 03/01,03/02,03/06,03/07,03/13,
# 04/05,05/29,05/31,06/01,
# 06/05,06/26 Gerd Kortemeyer
# 06/26 Ben Tyszka
# 06/30,07/15,07/17,07/18,07/20,07/21,07/22,07/25 Gerd Kortemeyer
# 08/14 Ben Tyszka
# 08/22,08/28,08/31,09/01,09/02,09/04,09/05,09/25,09/28,09/30 Gerd Kortemeyer
# 10/04 Gerd Kortemeyer
# 10/04 Guy Albertelli
# 10/06,10/09,10/10,10/11,10/14,10/20,10/23,10/25,10/26,10/27,10/28,10/29,
# 10/30,10/31,
# 11/2,11/14,11/15,11/16,11/20,11/21,11/22,11/25,11/27,
# 12/02,12/12,12/13,12/14,12/28,12/29 Gerd Kortemeyer
# 05/01/01 Guy Albertelli
# 05/01,06/01,09/01 Gerd Kortemeyer
# 09/01 Guy Albertelli
# 09/01,10/01,11/01 Gerd Kortemeyer
# YEAR=2001
# 3/2 Gerd Kortemeyer
# 3/19,3/20 Gerd Kortemeyer
# 5/26,5/28 Gerd Kortemeyer
# 5/30 H. K. Ng
# 6/1 Gerd Kortemeyer
# July Guy Albertelli
# 8/4,8/7,8/8,8/9,8/11,8/16,8/17,8/18,8/20,8/23,9/20,9/21,9/26,
# 10/2 Gerd Kortemeyer
# 11/17,11/20,11/22,11/29 Gerd Kortemeyer
# 12/5 Matthew Hall
# 12/5 Guy Albertelli
# 12/6,12/7,12/12 Gerd Kortemeyer
# 12/21,12/22,12/27,12/28 Gerd Kortemeyer
# YEAR=2002
# 1/4,2/4,2/7 Gerd Kortemeyer
#
###
package Apache::lonnet;
use strict;
use Apache::File;
use LWP::UserAgent();
use HTTP::Headers;
use vars
qw(%perlvar %hostname %homecache %badServerCache %hostip %iphost %spareid %hostdom
%libserv %pr %prp %metacache %packagetab %titlecache
%courselogs %accesshash $processmarker $dumpcount
%coursedombuf %coursehombuf %courseresdatacache
%domaindescription %domain_auth_def %domain_auth_arg_def $tmpdir);
use IO::Socket;
use GDBM_File;
use Apache::Constants qw(:common :http);
use HTML::LCParser;
use Fcntl qw(:flock);
use Apache::loncoursedata;
my $readit;
# --------------------------------------------------------------------- Logging
sub logtouch {
my $execdir=$perlvar{'lonDaemons'};
unless (-e "$execdir/logs/lonnet.log") {
my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
close $fh;
}
my ($wwwuid,$wwwgid)=(getpwnam('www'))[2,3];
chown($wwwuid,$wwwgid,$execdir.'/logs/lonnet.log');
}
sub logthis {
my $message=shift;
my $execdir=$perlvar{'lonDaemons'};
my $now=time;
my $local=localtime($now);
my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
print $fh "$local ($$): $message\n";
return 1;
}
sub logperm {
my $message=shift;
my $execdir=$perlvar{'lonDaemons'};
my $now=time;
my $local=localtime($now);
my $fh=Apache::File->new(">>$execdir/logs/lonnet.perm.log");
print $fh "$now:$message:$local\n";
return 1;
}
# -------------------------------------------------- Non-critical communication
sub subreply {
my ($cmd,$server)=@_;
my $peerfile="$perlvar{'lonSockDir'}/$server";
my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
Type => SOCK_STREAM,
Timeout => 10)
or return "con_lost";
print $client "$cmd\n";
my $answer=<$client>;
if (!$answer) { $answer="con_lost"; }
chomp($answer);
return $answer;
}
sub reply {
my ($cmd,$server)=@_;
unless (defined($hostname{$server})) { return 'no_such_host'; }
my $answer=subreply($cmd,$server);
if ($answer eq 'con_lost') {
#sleep 5;
#$answer=subreply($cmd,$server);
#if ($answer eq 'con_lost') {
# &logthis("Second attempt con_lost on $server");
# my $peerfile="$perlvar{'lonSockDir'}/$server";
# my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
# Type => SOCK_STREAM,
# Timeout => 10)
# or return "con_lost";
# &logthis("Killing socket");
# print $client "close_connection_exit\n";
#sleep 5;
# $answer=subreply($cmd,$server);
#}
}
if (($answer=~/^refused/) || ($answer=~/^rejected/)) {
&logthis("WARNING:".
" $cmd to $server returned $answer");
}
return $answer;
}
# ----------------------------------------------------------- Send USR1 to lonc
sub reconlonc {
my $peerfile=shift;
&logthis("Trying to reconnect for $peerfile");
my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
if (my $fh=Apache::File->new("$loncfile")) {
my $loncpid=<$fh>;
chomp($loncpid);
if (kill 0 => $loncpid) {
&logthis("lonc at pid $loncpid responding, sending USR1");
kill USR1 => $loncpid;
sleep 1;
if (-e "$peerfile") { return; }
&logthis("$peerfile still not there, give it another try");
sleep 5;
if (-e "$peerfile") { return; }
&logthis(
"WARNING: $peerfile still not there, giving up");
} else {
&logthis(
"WARNING:".
" lonc at pid $loncpid not responding, giving up");
}
} else {
&logthis('WARNING: lonc not running, giving up');
}
}
# ------------------------------------------------------ Critical communication
sub critical {
my ($cmd,$server)=@_;
unless ($hostname{$server}) {
&logthis("WARNING:".
" Critical message to unknown server ($server)");
return 'no_such_host';
}
my $answer=reply($cmd,$server);
if ($answer eq 'con_lost') {
my $pingreply=reply('ping',$server);
&reconlonc("$perlvar{'lonSockDir'}/$server");
my $pongreply=reply('pong',$server);
&logthis("Ping/Pong for $server: $pingreply/$pongreply");
$answer=reply($cmd,$server);
if ($answer eq 'con_lost') {
my $now=time;
my $middlename=$cmd;
$middlename=substr($middlename,0,16);
$middlename=~s/\W//g;
my $dfilename=
"$perlvar{'lonSockDir'}/delayed/$now.$dumpcount.$$.$middlename.$server";
$dumpcount++;
{
my $dfh;
if ($dfh=Apache::File->new(">$dfilename")) {
print $dfh "$cmd\n";
}
}
sleep 2;
my $wcmd='';
{
my $dfh;
if ($dfh=Apache::File->new("$dfilename")) {
$wcmd=<$dfh>;
}
}
chomp($wcmd);
if ($wcmd eq $cmd) {
&logthis("WARNING: ".
"Connection buffer $dfilename: $cmd");
&logperm("D:$server:$cmd");
return 'con_delayed';
} else {
&logthis("CRITICAL:"
." Critical connection failed: $server $cmd");
&logperm("F:$server:$cmd");
return 'con_failed';
}
}
}
return $answer;
}
# ---------------------------------------------------------- Append Environment
sub appenv {
my %newenv=@_;
foreach (keys %newenv) {
if (($newenv{$_}=~/^user\.role/) || ($newenv{$_}=~/^user\.priv/)) {
&logthis("WARNING: ".
"Attempt to modify environment ".$_." to ".$newenv{$_}
.'');
delete($newenv{$_});
} else {
$ENV{$_}=$newenv{$_};
}
}
my $lockfh;
unless ($lockfh=Apache::File->new("$ENV{'user.environment'}")) {
return 'error: '.$!;
}
unless (flock($lockfh,LOCK_EX)) {
&logthis("WARNING: ".
'Could not obtain exclusive lock in appenv: '.$!);
$lockfh->close();
return 'error: '.$!;
}
my @oldenv;
{
my $fh;
unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
return 'error: '.$!;
}
@oldenv=<$fh>;
$fh->close();
}
for (my $i=0; $i<=$#oldenv; $i++) {
chomp($oldenv[$i]);
if ($oldenv[$i] ne '') {
my ($name,$value)=split(/=/,$oldenv[$i]);
unless (defined($newenv{$name})) {
$newenv{$name}=$value;
}
}
}
{
my $fh;
unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
return 'error';
}
my $newname;
foreach $newname (keys %newenv) {
print $fh "$newname=$newenv{$newname}\n";
}
$fh->close();
}
$lockfh->close();
return 'ok';
}
# ----------------------------------------------------- Delete from Environment
sub delenv {
my $delthis=shift;
my %newenv=();
if (($delthis=~/user\.role/) || ($delthis=~/user\.priv/)) {
&logthis("WARNING: ".
"Attempt to delete from environment ".$delthis);
return 'error';
}
my @oldenv;
{
my $fh;
unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
return 'error';
}
unless (flock($fh,LOCK_SH)) {
&logthis("WARNING: ".
'Could not obtain shared lock in delenv: '.$!);
$fh->close();
return 'error: '.$!;
}
@oldenv=<$fh>;
$fh->close();
}
{
my $fh;
unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
return 'error';
}
unless (flock($fh,LOCK_EX)) {
&logthis("WARNING: ".
'Could not obtain exclusive lock in delenv: '.$!);
$fh->close();
return 'error: '.$!;
}
foreach (@oldenv) {
unless ($_=~/^$delthis/) { print $fh $_; }
}
$fh->close();
}
return 'ok';
}
# ------------------------------------------ Fight off request when overloaded
sub overloaderror {
my ($r,$checkserver)=@_;
unless ($checkserver) { $checkserver=$perlvar{'lonHostID'}; }
my $loadavg;
if ($checkserver eq $perlvar{'lonHostID'}) {
my $loadfile=Apache::File->new('/proc/loadavg');
$loadavg=<$loadfile>;
$loadavg =~ s/\s.*//g;
$loadavg = 100*$loadavg/$perlvar{'lonLoadLim'};
} else {
$loadavg=&reply('load',$checkserver);
}
my $overload=$loadavg-100;
if ($overload>0) {
$r->err_headers_out->{'Retry-After'}=$overload;
$r->log_error('Overload of '.$overload.' on '.$checkserver);
return 413;
}
return '';
}
# ------------------------------ Find server with least workload from spare.tab
sub spareserver {
my $loadpercent = shift;
my $tryserver;
my $spareserver='';
my $lowestserver=$loadpercent;
foreach $tryserver (keys %spareid) {
my $answer=reply('load',$tryserver);
if (($answer =~ /\d/) && ($answer<$lowestserver)) {
$spareserver="http://$hostname{$tryserver}";
$lowestserver=$answer;
}
}
return $spareserver;
}
# --------------------------------------------- Try to change a user's password
sub changepass {
my ($uname,$udom,$currentpass,$newpass,$server)=@_;
$currentpass = &escape($currentpass);
$newpass = &escape($newpass);
my $answer = reply("encrypt:passwd:$udom:$uname:$currentpass:$newpass",
$server);
if (! $answer) {
&logthis("No reply on password change request to $server ".
"by $uname in domain $udom.");
} elsif ($answer =~ "^ok") {
&logthis("$uname in $udom successfully changed their password ".
"on $server.");
} elsif ($answer =~ "^pwchange_failure") {
&logthis("$uname in $udom was unable to change their password ".
"on $server. The action was blocked by either lcpasswd ".
"or pwchange");
} elsif ($answer =~ "^non_authorized") {
&logthis("$uname in $udom did not get their password correct when ".
"attempting to change it on $server.");
} elsif ($answer =~ "^auth_mode_error") {
&logthis("$uname in $udom attempted to change their password despite ".
"not being locally or internally authenticated on $server.");
} elsif ($answer =~ "^unknown_user") {
&logthis("$uname in $udom attempted to change their password ".
"on $server but were unable to because $server is not ".
"their home server.");
} elsif ($answer =~ "^refused") {
&logthis("$server refused to change $uname in $udom password because ".
"it was sent an unencrypted request to change the password.");
}
return $answer;
}
# ----------------------- Try to determine user's current authentication scheme
sub queryauthenticate {
my ($uname,$udom)=@_;
if (($perlvar{'lonRole'} eq 'library') &&
($udom eq $perlvar{'lonDefDomain'})) {
my $answer=reply("encrypt:currentauth:$udom:$uname",
$perlvar{'lonHostID'});
unless ($answer eq 'unknown_user' or $answer eq 'refused') {
if (length($answer)) {
return $answer;
}
else {
&logthis("User $uname at $udom lacks an authentication mechanism");
return 'no_host';
}
}
}
my $tryserver;
foreach $tryserver (keys %libserv) {
if ($hostdom{$tryserver} eq $udom) {
my $answer=reply("encrypt:currentauth:$udom:$uname",$tryserver);
unless ($answer eq 'unknown_user' or $answer eq 'refused') {
if (length($answer)) {
return $answer;
}
else {
&logthis("User $uname at $udom lacks an authentication mechanism");
return 'no_host';
}
}
}
}
&logthis("User $uname at $udom lacks an authentication mechanism");
return 'no_host';
}
# --------- Try to authenticate user from domain's lib servers (first this one)
sub authenticate {
my ($uname,$upass,$udom)=@_;
$upass=escape($upass);
$uname=~s/\W//g;
if (($perlvar{'lonRole'} eq 'library') &&
($udom eq $perlvar{'lonDefDomain'})) {
my $answer=reply("encrypt:auth:$udom:$uname:$upass",$perlvar{'lonHostID'});
if ($answer =~ /authorized/) {
if ($answer eq 'authorized') {
&logthis("User $uname at $udom authorized by local server");
return $perlvar{'lonHostID'};
}
if ($answer eq 'non_authorized') {
&logthis("User $uname at $udom rejected by local server");
return 'no_host';
}
}
}
my $tryserver;
foreach $tryserver (keys %libserv) {
if ($hostdom{$tryserver} eq $udom) {
my $answer=reply("encrypt:auth:$udom:$uname:$upass",$tryserver);
if ($answer =~ /authorized/) {
if ($answer eq 'authorized') {
&logthis("User $uname at $udom authorized by $tryserver");
return $tryserver;
}
if ($answer eq 'non_authorized') {
&logthis("User $uname at $udom rejected by $tryserver");
return 'no_host';
}
}
}
}
&logthis("User $uname at $udom could not be authenticated");
return 'no_host';
}
# ---------------------- Find the homebase for a user from domain's lib servers
sub homeserver {
my ($uname,$udom,$ignoreBadCache)=@_;
my $index="$uname:$udom";
if ($homecache{$index}) {
return "$homecache{$index}";
}
my $tryserver;
foreach $tryserver (keys %libserv) {
next if ($ignoreBadCache ne 'true' &&
exists($badServerCache{$tryserver}));
if ($hostdom{$tryserver} eq $udom) {
my $answer=reply("home:$udom:$uname",$tryserver);
if ($answer eq 'found') {
$homecache{$index}=$tryserver;
return $tryserver;
} elsif ($answer eq 'no_host') {
$badServerCache{$tryserver}=1;
}
}
}
return 'no_host';
}
# ------------------------------------- Find the usernames behind a list of IDs
sub idget {
my ($udom,@ids)=@_;
my %returnhash=();
my $tryserver;
foreach $tryserver (keys %libserv) {
if ($hostdom{$tryserver} eq $udom) {
my $idlist=join('&',@ids);
$idlist=~tr/A-Z/a-z/;
my $reply=&reply("idget:$udom:".$idlist,$tryserver);
my @answer=();
if (($reply ne 'con_lost') && ($reply!~/^error\:/)) {
@answer=split(/\&/,$reply);
} ;
my $i;
for ($i=0;$i<=$#ids;$i++) {
if ($answer[$i]) {
$returnhash{$ids[$i]}=$answer[$i];
}
}
}
}
return %returnhash;
}
# ------------------------------------- Find the IDs behind a list of usernames
sub idrget {
my ($udom,@unames)=@_;
my %returnhash=();
foreach (@unames) {
$returnhash{$_}=(&userenvironment($udom,$_,'id'))[1];
}
return %returnhash;
}
# ------------------------------- Store away a list of names and associated IDs
sub idput {
my ($udom,%ids)=@_;
my %servers=();
foreach (keys %ids) {
my $uhom=&homeserver($_,$udom);
if ($uhom ne 'no_host') {
my $id=&escape($ids{$_});
$id=~tr/A-Z/a-z/;
my $unam=&escape($_);
if ($servers{$uhom}) {
$servers{$uhom}.='&'.$id.'='.$unam;
} else {
$servers{$uhom}=$id.'='.$unam;
}
&critical('put:'.$udom.':'.$unam.':environment:id='.$id,$uhom);
}
}
foreach (keys %servers) {
&critical('idput:'.$udom.':'.$servers{$_},$_);
}
}
# ------------------------------------- Find the section of student in a course
sub getsection {
my ($udom,$unam,$courseid)=@_;
$courseid=~s/\_/\//g;
$courseid=~s/^(\w)/\/$1/;
my %Pending;
my %Expired;
#
# Each role can either have not started yet (pending), be active,
# or have expired.
#
# If there is an active role, we are done.
#
# If there is more than one role which has not started yet,
# choose the one which will start sooner
# If there is one role which has not started yet, return it.
#
# If there is more than one expired role, choose the one which ended last.
# If there is a role which has expired, return it.
#
foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
&homeserver($unam,$udom)))) {
my ($key,$value)=split(/\=/,$_);
$key=&unescape($key);
next if ($key !~/^$courseid(?:\/)*(\w+)*\_st$/);
my $section=$1;
if ($key eq $courseid.'_st') { $section=''; }
my ($dummy,$end,$start)=split(/\_/,&unescape($value));
my $now=time;
if (defined($end) && ($now > $end)) {
$Expired{$end}=$section;
next;
}
if (defined($start) && ($now < $start)) {
$Pending{$start}=$section;
next;
}
return $section;
}
#
# Presumedly there will be few matching roles from the above
# loop and the sorting time will be negligible.
if (scalar(keys(%Pending))) {
my ($time) = sort {$a <=> $b} keys(%Pending);
return $Pending{$time};
}
if (scalar(keys(%Expired))) {
my @sorted = sort {$a <=> $b} keys(%Expired);
my $time = pop(@sorted);
return $Expired{$time};
}
return '-1';
}
sub usection {
my ($udom,$unam,$courseid)=@_;
$courseid=~s/\_/\//g;
$courseid=~s/^(\w)/\/$1/;
foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
&homeserver($unam,$udom)))) {
my ($key,$value)=split(/\=/,$_);
$key=&unescape($key);
if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
my $section=$1;
if ($key eq $courseid.'_st') { $section=''; }
my ($dummy,$end,$start)=split(/\_/,&unescape($value));
my $now=time;
my $notactive=0;
if ($start) {
if ($now<$start) { $notactive=1; }
}
if ($end) {
if ($now>$end) { $notactive=1; }
}
unless ($notactive) { return $section; }
}
}
return '-1';
}
# ------------------------------------- Read an entry from a user's environment
sub userenvironment {
my ($udom,$unam,@what)=@_;
my %returnhash=();
my @answer=split(/\&/,
&reply('get:'.$udom.':'.$unam.':environment:'.join('&',@what),
&homeserver($unam,$udom)));
my $i;
for ($i=0;$i<=$#what;$i++) {
$returnhash{$what[$i]}=&unescape($answer[$i]);
}
return %returnhash;
}
# -------------------------------------------------------------------- New chat
sub chatsend {
my ($newentry,$anon)=@_;
my $cnum=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
my $chome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
&reply('chatsend:'.$cdom.':'.$cnum.':'.
&escape($ENV{'user.domain'}.':'.$ENV{'user.name'}.':'.$anon.':'.
&escape($newentry)),$chome);
}
# ------------------------------------------ Find current version of a resource
sub getversion {
my $fname=&clutter(shift);
unless ($fname=~/^\/res\//) { return -1; }
return ¤tversion(&filelocation('',$fname));
}
sub currentversion {
my $fname=shift;
my $author=$fname;
$author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
my ($udom,$uname)=split(/\//,$author);
my $home=homeserver($uname,$udom);
if ($home eq 'no_host') {
return -1;
}
my $answer=reply("currentversion:$fname",$home);
if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
return -1;
}
return $answer;
}
# ----------------------------- Subscribe to a resource, return URL if possible
sub subscribe {
my $fname=shift;
if ($fname=~/\/(aboutme|syllabus|bulletinboard|smppg)$/) { return ''; }
my $author=$fname;
$author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
my ($udom,$uname)=split(/\//,$author);
my $home=homeserver($uname,$udom);
if ($home eq 'no_host') {
return 'not_found';
}
my $answer=reply("sub:$fname",$home);
if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
$answer.=' by '.$home;
}
return $answer;
}
# -------------------------------------------------------------- Replicate file
sub repcopy {
my $filename=shift;
$filename=~s/\/+/\//g;
if ($filename=~/^\/home\/httpd\/html\/adm\//) { return OK; }
my $transname="$filename.in.transfer";
if ((-e $filename) || (-e $transname)) { return OK; }
my $remoteurl=subscribe($filename);
if ($remoteurl =~ /^con_lost by/) {
&logthis("Subscribe returned $remoteurl: $filename");
return HTTP_SERVICE_UNAVAILABLE;
} elsif ($remoteurl eq 'not_found') {
&logthis("Subscribe returned not_found: $filename");
return HTTP_NOT_FOUND;
} elsif ($remoteurl =~ /^rejected by/) {
&logthis("Subscribe returned $remoteurl: $filename");
return FORBIDDEN;
} elsif ($remoteurl eq 'directory') {
return OK;
} else {
my $author=$filename;
$author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
my ($udom,$uname)=split(/\//,$author);
my $home=homeserver($uname,$udom);
unless ($home eq $perlvar{'lonHostID'}) {
my @parts=split(/\//,$filename);
my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";
if ($path ne "$perlvar{'lonDocRoot'}/res") {
&logthis("Malconfiguration for replication: $filename");
return HTTP_BAD_REQUEST;
}
my $count;
for ($count=5;$count<$#parts;$count++) {
$path.="/$parts[$count]";
if ((-e $path)!=1) {
mkdir($path,0777);
}
}
my $ua=new LWP::UserAgent;
my $request=new HTTP::Request('GET',"$remoteurl");
my $response=$ua->request($request,$transname);
if ($response->is_error()) {
unlink($transname);
my $message=$response->status_line;
&logthis("WARNING:"
." LWP get: $message: $filename");
return HTTP_SERVICE_UNAVAILABLE;
} else {
if ($remoteurl!~/\.meta$/) {
my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
my $mresponse=$ua->request($mrequest,$filename.'.meta');
if ($mresponse->is_error()) {
unlink($filename.'.meta');
&logthis(
"INFO: No metadata: $filename");
}
}
rename($transname,$filename);
return OK;
}
}
}
}
# ------------------------------------------------ Get server side include body
sub ssi_body {
my $filelink=shift;
my $output=($filelink=~/^http\:/?&externalssi($filelink):
&ssi($filelink));
$output=~s/^.*\]*\>//si;
$output=~s/\<\/body\s*\>.*$//si;
$output=~
s/\/\/ BEGIN LON\-CAPA Internal.+\/\/ END LON\-CAPA Internal\s//gs;
return $output;
}
# --------------------------------------------------------- Server Side Include
sub ssi {
my ($fn,%form)=@_;
my $ua=new LWP::UserAgent;
my $request;
if (%form) {
$request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);
$request->content(join('&',map { &escape($_).'='.&escape($form{$_}) } keys %form));
} else {
$request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);
}
$request->header(Cookie => $ENV{'HTTP_COOKIE'});
my $response=$ua->request($request);
return $response->content;
}
sub externalssi {
my ($url)=@_;
my $ua=new LWP::UserAgent;
my $request=new HTTP::Request('GET',$url);
my $response=$ua->request($request);
return $response->content;
}
# ------- Add a token to a remote URI's query string to vouch for access rights
sub tokenwrapper {
my $uri=shift;
$uri=~s/^http\:\/\/([^\/]+)//;
$uri=~s/^\///;
$ENV{'user.environment'}=~/\/([^\/]+)\.id/;
my $token=$1;
if ($uri=~/^uploaded\/([^\/]+)\/([^\/]+)\/([^\/]+)(\?\.*)*$/) {
&appenv('userfile.'.$1.'/'.$2.'/'.$3 => $ENV{'request.course.id'});
return 'http://'.$hostname{ &homeserver($2,$1)}.'/'.$uri.
(($uri=~/\?/)?'&':'?').'token='.$token.
'&tokenissued='.$perlvar{'lonHostID'};
} else {
return '/adm/notfound.html';
}
}
# --------------- Take an uploaded file and put it into the userfiles directory
# input: name of form element, coursedoc=1 means this is for the course
# output: url of file in userspace
sub userfileupload {
my ($formname,$coursedoc)=@_;
my $fname=$ENV{'form.'.$formname.'.filename'};
# Replace Windows backslashes by forward slashes
$fname=~s/\\/\//g;
# Get rid of everything but the actual filename
$fname=~s/^.*\/([^\/]+)$/$1/;
# Replace spaces by underscores
$fname=~s/\s+/\_/g;
# Replace all other weird characters by nothing
$fname=~s/[^\w\.\-]//g;
# See if there is anything left
unless ($fname) { return 'error: no uploaded file'; }
chop($ENV{'form.'.$formname});
# Create the directory if not present
my $docuname='';
my $docudom='';
my $docuhome='';
if ($coursedoc) {
$docuname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
$docudom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
$docuhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
} else {
$docuname=$ENV{'user.name'};
$docudom=$ENV{'user.domain'};
$docuhome=$ENV{'user.home'};
}
return
&finishuserfileupload($docuname,$docudom,$docuhome,$formname,$fname);
}
sub finishuserfileupload {
my ($docuname,$docudom,$docuhome,$formname,$fname)=@_;
my $path=$docudom.'/'.$docuname.'/';
my $filepath=$perlvar{'lonDocRoot'};
my @parts=split(/\//,$filepath.'/userfiles/'.$path);
my $count;
for ($count=4;$count<=$#parts;$count++) {
$filepath.="/$parts[$count]";
if ((-e $filepath)!=1) {
mkdir($filepath,0777);
}
}
# Save the file
{
my $fh=Apache::File->new('>'.$filepath.'/'.$fname);
print $fh $ENV{'form.'.$formname};
}
# Notify homeserver to grep it
#
my $fetchresult=
&reply('fetchuserfile:'.$docudom.'/'.$docuname.'/'.$fname,$docuhome);
if ($fetchresult eq 'ok') {
#
# Return the URL to it
return '/uploaded/'.$path.$fname;
} else {
&logthis('Failed to transfer '.$docudom.'/'.$docuname.'/'.$fname.
' to host '.$docuhome.': '.$fetchresult);
return '/adm/notfound.html';
}
}
# ------------------------------------------------------------------------- Log
sub log {
my ($dom,$nam,$hom,$what)=@_;
return critical("log:$dom:$nam:$what",$hom);
}
# ------------------------------------------------------------------ Course Log
sub flushcourselogs {
&logthis('Flushing course log buffers');
foreach (keys %courselogs) {
my $crsid=$_;
if (&reply('log:'.$coursedombuf{$crsid}.':'.
&escape($courselogs{$crsid}),
$coursehombuf{$crsid}) eq 'ok') {
delete $courselogs{$crsid};
} else {
&logthis('Failed to flush log buffer for '.$crsid);
if (length($courselogs{$crsid})>40000) {
&logthis("WARNING: Buffer for ".$crsid.
" exceeded maximum size, deleting.");
delete $courselogs{$crsid};
}
}
}
&logthis('Flushing access logs');
foreach (keys %accesshash) {
my $entry=$_;
$entry=~/\_\_\_(\w+)\/(\w+)\/(.*)\_\_\_(\w+)$/;
my %temphash=($entry => $accesshash{$entry});
if (&Apache::lonnet::put('nohist_resevaldata',\%temphash,$1,$2) eq 'ok') {
delete $accesshash{$entry};
}
}
$dumpcount++;
}
sub courselog {
my $what=shift;
$what=time.':'.$what;
unless ($ENV{'request.course.id'}) { return ''; }
$coursedombuf{$ENV{'request.course.id'}}=
$ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.
$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
$coursehombuf{$ENV{'request.course.id'}}=
$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
if (defined $courselogs{$ENV{'request.course.id'}}) {
$courselogs{$ENV{'request.course.id'}}.='&'.$what;
} else {
$courselogs{$ENV{'request.course.id'}}.=$what;
}
if (length($courselogs{$ENV{'request.course.id'}})>4048) {
&flushcourselogs();
}
}
sub courseacclog {
my $fnsymb=shift;
unless ($ENV{'request.course.id'}) { return ''; }
my $what=$fnsymb.':'.$ENV{'user.name'}.':'.$ENV{'user.domain'};
if ($fnsymb=~/(problem|exam|quiz|assess|survey|form)$/) {
$what.=':POST';
foreach (keys %ENV) {
if ($_=~/^form\.(.*)/) {
$what.=':'.$1.'='.$ENV{$_};
}
}
}
&courselog($what);
}
sub countacc {
my $url=&declutter(shift);
unless ($ENV{'request.course.id'}) { return ''; }
$accesshash{$ENV{'request.course.id'}.'___'.$url.'___course'}=1;
my $key=$$.$processmarker.'_'.$dumpcount.'___'.$url.'___count';
if (defined($accesshash{$key})) {
$accesshash{$key}++;
} else {
$accesshash{$key}=1;
}
}
# ----------------------------------------------------------- Check out an item
sub checkout {
my ($symb,$tuname,$tudom,$tcrsid)=@_;
my $now=time;
my $lonhost=$perlvar{'lonHostID'};
my $infostr=&escape(
'CHECKOUTTOKEN&'.
$tuname.'&'.
$tudom.'&'.
$tcrsid.'&'.
$symb.'&'.
$now.'&'.$ENV{'REMOTE_ADDR'});
my $token=&reply('tmpput:'.$infostr,$lonhost);
if ($token=~/^error\:/) {
&logthis("WARNING: ".
"Checkout tmpput failed ".$tudom.' - '.$tuname.' - '.$symb.
"");
return '';
}
$token=~s/^(\d+)\_.*\_(\d+)$/$1\*$2\*$lonhost/;
$token=~tr/a-z/A-Z/;
my %infohash=('resource.0.outtoken' => $token,
'resource.0.checkouttime' => $now,
'resource.0.outremote' => $ENV{'REMOTE_ADDR'});
unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
return '';
} else {
&logthis("WARNING: ".
"Checkout cstore failed ".$tudom.' - '.$tuname.' - '.$symb.
"");
}
if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
&escape('Checkout '.$infostr.' - '.
$token)) ne 'ok') {
return '';
} else {
&logthis("WARNING: ".
"Checkout log failed ".$tudom.' - '.$tuname.' - '.$symb.
"");
}
return $token;
}
# ------------------------------------------------------------ Check in an item
sub checkin {
my $token=shift;
my $now=time;
my ($ta,$tb,$lonhost)=split(/\*/,$token);
$lonhost=~tr/A-Z/a-z/;
my $dtoken=$ta.'_'.$hostip{$lonhost}.'_'.$tb;
$dtoken=~s/\W/\_/g;
my ($dummy,$tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=
split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));
unless (($tuname) && ($tudom)) {
&logthis('Check in '.$token.' ('.$dtoken.') failed');
return '';
}
unless (&allowed('mgr',$tcrsid)) {
&logthis('Check in '.$token.' ('.$dtoken.') unauthorized: '.
$ENV{'user.name'}.' - '.$ENV{'user.domain'});
return '';
}
my %infohash=('resource.0.intoken' => $token,
'resource.0.checkintime' => $now,
'resource.0.inremote' => $ENV{'REMOTE_ADDR'});
unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
return '';
}
if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
&escape('Checkin - '.$token)) ne 'ok') {
return '';
}
return ($symb,$tuname,$tudom,$tcrsid);
}
# --------------------------------------------- Set Expire Date for Spreadsheet
sub expirespread {
my ($uname,$udom,$stype,$usymb)=@_;
my $cid=$ENV{'request.course.id'};
if ($cid) {
my $now=time;
my $key=$uname.':'.$udom.':'.$stype.':'.$usymb;
return &reply('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
$ENV{'course.'.$cid.'.num'}.
':nohist_expirationdates:'.
&escape($key).'='.$now,
$ENV{'course.'.$cid.'.home'})
}
return 'ok';
}
# ----------------------------------------------------- Devalidate Spreadsheets
sub devalidate {
my ($symb,$uname,$udom)=@_;
my $cid=$ENV{'request.course.id'};
if ($cid) {
# delete the stored spreadsheets for
# - the student level sheet of this user in course's homespace
# - the assessment level sheet for this resource
# for this user in user's homespace
my $key=$uname.':'.$udom.':';
my $status=
&del('nohist_calculatedsheets',
[$key.'studentcalc'],
$ENV{'course.'.$cid.'.domain'},
$ENV{'course.'.$cid.'.num'})
.' '.
&del('nohist_calculatedsheets_'.$cid,
[$key.'assesscalc:'.$symb]);
unless ($status eq 'ok ok') {
&logthis('Could not devalidate spreadsheet '.
$uname.' at '.$udom.' for '.
$symb.': '.$status);
}
}
}
sub get_scalar {
my ($string,$end) = @_;
my $value;
if ($$string =~ s/^([^&]*?)($end)/$2/) {
$value = $1;
} elsif ($$string =~ s/^([^&]*?)&//) {
$value = $1;
}
return &unescape($value);
}
sub array2str {
my (@array) = @_;
my $result=&arrayref2str(\@array);
$result=~s/^__ARRAY_REF__//;
$result=~s/__END_ARRAY_REF__$//;
return $result;
}
sub arrayref2str {
my ($arrayref) = @_;
my $result='__ARRAY_REF__';
foreach my $elem (@$arrayref) {
if(ref($elem) eq 'ARRAY') {
$result.=&arrayref2str($elem).'&';
} elsif(ref($elem) eq 'HASH') {
$result.=&hashref2str($elem).'&';
} elsif(ref($elem)) {
#print("Got a ref of ".(ref($elem))." skipping.");
} else {
$result.=&escape($elem).'&';
}
}
$result=~s/\&$//;
$result .= '__END_ARRAY_REF__';
return $result;
}
sub hash2str {
my (%hash) = @_;
my $result=&hashref2str(\%hash);
$result=~s/^__HASH_REF__//;
$result=~s/__END_HASH_REF__$//;
return $result;
}
sub hashref2str {
my ($hashref)=@_;
my $result='__HASH_REF__';
foreach (keys(%$hashref)) {
if (ref($_) eq 'ARRAY') {
$result.=&arrayref2str($_).'=';
} elsif (ref($_) eq 'HASH') {
$result.=&hashref2str($_).'=';
} elsif (ref($_)) {
$result.='=';
#print("Got a ref of ".(ref($_))." skipping.");
} else {
if ($_) {$result.=&escape($_).'=';} else { last; }
}
if(ref($hashref->{$_}) eq 'ARRAY') {
$result.=&arrayref2str($hashref->{$_}).'&';
} elsif(ref($hashref->{$_}) eq 'HASH') {
$result.=&hashref2str($hashref->{$_}).'&';
} elsif(ref($hashref->{$_})) {
$result.='&';
#print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
} else {
$result.=&escape($hashref->{$_}).'&';
}
}
$result=~s/\&$//;
$result .= '__END_HASH_REF__';
return $result;
}
sub str2hash {
my ($string)=@_;
my ($hash)=&str2hashref('__HASH_REF__'.$string.'__END_HASH_REF__');
return %$hash;
}
sub str2hashref {
my ($string) = @_;
my %hash;
if($string !~ /^__HASH_REF__/) {
if (! ($string eq '' || !defined($string))) {
$hash{'error'}='Not hash reference';
}
return (\%hash, $string);
}
$string =~ s/^__HASH_REF__//;
while($string !~ /^__END_HASH_REF__/) {
#key
my $key='';
if($string =~ /^__HASH_REF__/) {
($key, $string)=&str2hashref($string);
if(defined($key->{'error'})) {
$hash{'error'}='Bad data';
return (\%hash, $string);
}
} elsif($string =~ /^__ARRAY_REF__/) {
($key, $string)=&str2arrayref($string);
if($key->[0] eq 'Array reference error') {
$hash{'error'}='Bad data';
return (\%hash, $string);
}
} else {
$string =~ s/^(.*?)=//;
$key=&unescape($1);
}
$string =~ s/^=//;
#value
my $value='';
if($string =~ /^__HASH_REF__/) {
($value, $string)=&str2hashref($string);
if(defined($value->{'error'})) {
$hash{'error'}='Bad data';
return (\%hash, $string);
}
} elsif($string =~ /^__ARRAY_REF__/) {
($value, $string)=&str2arrayref($string);
if($value->[0] eq 'Array reference error') {
$hash{'error'}='Bad data';
return (\%hash, $string);
}
} else {
$value=&get_scalar(\$string,'__END_HASH_REF__');
}
$string =~ s/^&//;
$hash{$key}=$value;
}
$string =~ s/^__END_HASH_REF__//;
return (\%hash, $string);
}
sub str2array {
my ($string)=@_;
my ($array)=&str2arrayref('__ARRAY_REF__'.$string.'__END_ARRAY_REF__');
return @$array;
}
sub str2arrayref {
my ($string) = @_;
my @array;
if($string !~ /^__ARRAY_REF__/) {
if (! ($string eq '' || !defined($string))) {
$array[0]='Array reference error';
}
return (\@array, $string);
}
$string =~ s/^__ARRAY_REF__//;
while($string !~ /^__END_ARRAY_REF__/) {
my $value='';
if($string =~ /^__HASH_REF__/) {
($value, $string)=&str2hashref($string);
if(defined($value->{'error'})) {
$array[0] ='Array reference error';
return (\@array, $string);
}
} elsif($string =~ /^__ARRAY_REF__/) {
($value, $string)=&str2arrayref($string);
if($value->[0] eq 'Array reference error') {
$array[0] ='Array reference error';
return (\@array, $string);
}
} else {
$value=&get_scalar(\$string,'__END_ARRAY_REF__');
}
$string =~ s/^&//;
push(@array, $value);
}
$string =~ s/^__END_ARRAY_REF__//;
return (\@array, $string);
}
# -------------------------------------------------------------------Temp Store
sub tmpreset {
my ($symb,$namespace,$domain,$stuname) = @_;
if (!$symb) {
$symb=&symbread();
if (!$symb) { $symb= $ENV{'REQUEST_URI'}; }
}
$symb=escape($symb);
if (!$namespace) { $namespace=$ENV{'request.state'}; }
$namespace=~s/\//\_/g;
$namespace=~s/\W//g;
#FIXME needs to do something for /pub resources
if (!$domain) { $domain=$ENV{'user.domain'}; }
if (!$stuname) { $stuname=$ENV{'user.name'}; }
my $path=$perlvar{'lonDaemons'}.'/tmp';
my %hash;
if (tie(%hash,'GDBM_File',
$path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
&GDBM_WRCREAT(),0640)) {
foreach my $key (keys %hash) {
if ($key=~ /:$symb/) {
delete($hash{$key});
}
}
}
}
sub tmpstore {
my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
if (!$symb) {
$symb=&symbread();
if (!$symb) { $symb= $ENV{'request.url'}; }
}
$symb=escape($symb);
if (!$namespace) {
# I don't think we would ever want to store this for a course.
# it seems this will only be used if we don't have a course.
#$namespace=$ENV{'request.course.id'};
#if (!$namespace) {
$namespace=$ENV{'request.state'};
#}
}
$namespace=~s/\//\_/g;
$namespace=~s/\W//g;
#FIXME needs to do something for /pub resources
if (!$domain) { $domain=$ENV{'user.domain'}; }
if (!$stuname) { $stuname=$ENV{'user.name'}; }
my $now=time;
my %hash;
my $path=$perlvar{'lonDaemons'}.'/tmp';
if (tie(%hash,'GDBM_File',
$path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
&GDBM_WRCREAT(),0640)) {
$hash{"version:$symb"}++;
my $version=$hash{"version:$symb"};
my $allkeys='';
foreach my $key (keys(%$storehash)) {
$allkeys.=$key.':';
$hash{"$version:$symb:$key"}=$$storehash{$key};
}
$hash{"$version:$symb:timestamp"}=$now;
$allkeys.='timestamp';
$hash{"$version:keys:$symb"}=$allkeys;
if (untie(%hash)) {
return 'ok';
} else {
return "error:$!";
}
} else {
return "error:$!";
}
}
# -----------------------------------------------------------------Temp Restore
sub tmprestore {
my ($symb,$namespace,$domain,$stuname) = @_;
if (!$symb) {
$symb=&symbread();
if (!$symb) { $symb= $ENV{'request.url'}; }
}
$symb=escape($symb);
if (!$namespace) { $namespace=$ENV{'request.state'}; }
#FIXME needs to do something for /pub resources
if (!$domain) { $domain=$ENV{'user.domain'}; }
if (!$stuname) { $stuname=$ENV{'user.name'}; }
my %returnhash;
$namespace=~s/\//\_/g;
$namespace=~s/\W//g;
my %hash;
my $path=$perlvar{'lonDaemons'}.'/tmp';
if (tie(%hash,'GDBM_File',
$path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
&GDBM_READER(),0640)) {
my $version=$hash{"version:$symb"};
$returnhash{'version'}=$version;
my $scope;
for ($scope=1;$scope<=$version;$scope++) {
my $vkeys=$hash{"$scope:keys:$symb"};
my @keys=split(/:/,$vkeys);
my $key;
$returnhash{"$scope:keys"}=$vkeys;
foreach $key (@keys) {
$returnhash{"$scope:$key"}=$hash{"$scope:$symb:$key"};
$returnhash{"$key"}=$hash{"$scope:$symb:$key"};
}
}
if (!(untie(%hash))) {
return "error:$!";
}
} else {
return "error:$!";
}
return %returnhash;
}
# ----------------------------------------------------------------------- Store
sub store {
my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
my $home='';
if ($stuname) { $home=&homeserver($stuname,$domain); }
$symb=&symbclean($symb);
if (!$symb) { unless ($symb=&symbread()) { return ''; } }
if (!$domain) { $domain=$ENV{'user.domain'}; }
if (!$stuname) { $stuname=$ENV{'user.name'}; }
&devalidate($symb,$stuname,$domain);
$symb=escape($symb);
if (!$namespace) {
unless ($namespace=$ENV{'request.course.id'}) {
return '';
}
}
if (!$home) { $home=$ENV{'user.home'}; }
my $namevalue='';
foreach (keys %$storehash) {
$namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
}
$namevalue=~s/\&$//;
&courselog($symb.':'.$stuname.':'.$domain.':STORE:'.$namevalue);
return reply("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
}
# -------------------------------------------------------------- Critical Store
sub cstore {
my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
my $home='';
if ($stuname) { $home=&homeserver($stuname,$domain); }
$symb=&symbclean($symb);
if (!$symb) { unless ($symb=&symbread()) { return ''; } }
if (!$domain) { $domain=$ENV{'user.domain'}; }
if (!$stuname) { $stuname=$ENV{'user.name'}; }
&devalidate($symb,$stuname,$domain);
$symb=escape($symb);
if (!$namespace) {
unless ($namespace=$ENV{'request.course.id'}) {
return '';
}
}
if (!$home) { $home=$ENV{'user.home'}; }
my $namevalue='';
foreach (keys %$storehash) {
$namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
}
$namevalue=~s/\&$//;
&courselog($symb.':'.$stuname.':'.$domain.':CSTORE:'.$namevalue);
return critical
("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
}
# --------------------------------------------------------------------- Restore
sub restore {
my ($symb,$namespace,$domain,$stuname) = @_;
my $home='';
if ($stuname) { $home=&homeserver($stuname,$domain); }
if (!$symb) {
unless ($symb=escape(&symbread())) { return ''; }
} else {
$symb=&escape(&symbclean($symb));
}
if (!$namespace) {
unless ($namespace=$ENV{'request.course.id'}) {
return '';
}
}
if (!$domain) { $domain=$ENV{'user.domain'}; }
if (!$stuname) { $stuname=$ENV{'user.name'}; }
if (!$home) { $home=$ENV{'user.home'}; }
my $answer=&reply("restore:$domain:$stuname:$namespace:$symb","$home");
my %returnhash=();
foreach (split(/\&/,$answer)) {
my ($name,$value)=split(/\=/,$_);
$returnhash{&unescape($name)}=&unescape($value);
}
my $version;
for ($version=1;$version<=$returnhash{'version'};$version++) {
foreach (split(/\:/,$returnhash{$version.':keys'})) {
$returnhash{$_}=$returnhash{$version.':'.$_};
}
}
return %returnhash;
}
# ---------------------------------------------------------- Course Description
sub coursedescription {
my $courseid=shift;
$courseid=~s/^\///;
$courseid=~s/\_/\//g;
my ($cdomain,$cnum)=split(/\//,$courseid);
my $chome=&homeserver($cnum,$cdomain);
my $normalid=$cdomain.'_'.$cnum;
# need to always cache even if we get errors otherwise we keep
# trying and trying and trying to get the course description.
my %envhash=();
my %returnhash=();
$envhash{'course.'.$normalid.'.last_cache'}=time;
if ($chome ne 'no_host') {
%returnhash=&dump('environment',$cdomain,$cnum);
if (!exists($returnhash{'con_lost'})) {
$returnhash{'home'}= $chome;
$returnhash{'domain'} = $cdomain;
$returnhash{'num'} = $cnum;
while (my ($name,$value) = each %returnhash) {
$envhash{'course.'.$normalid.'.'.$name}=$value;
}
$returnhash{'url'}=&clutter($returnhash{'url'});
$returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
$ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
$envhash{'course.'.$normalid.'.home'}=$chome;
$envhash{'course.'.$normalid.'.domain'}=$cdomain;
$envhash{'course.'.$normalid.'.num'}=$cnum;
}
}
&appenv(%envhash);
return %returnhash;
}
# -------------------------------------------------------- Get user privileges
sub rolesinit {
my ($domain,$username,$authhost)=@_;
my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return ''; }
my %allroles=();
my %thesepriv=();
my $now=time;
my $userroles="user.login.time=$now\n";
my $thesestr;
if ($rolesdump ne '') {
foreach (split(/&/,$rolesdump)) {
if ($_!~/^rolesdef\&/) {
my ($area,$role)=split(/=/,$_);
$area=~s/\_\w\w$//;
my ($trole,$tend,$tstart)=split(/_/,$role);
$userroles.='user.role.'.$trole.'.'.$area.'='.
$tstart.'.'.$tend."\n";
if ($tend!=0) {
if ($tend<$now) {
$trole='';
}
}
if ($tstart!=0) {
if ($tstart>$now) {
$trole='';
}
}
if (($area ne '') && ($trole ne '')) {
my $spec=$trole.'.'.$area;
my ($tdummy,$tdomain,$trest)=split(/\//,$area);
if ($trole =~ /^cr\//) {
my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
my $homsvr=homeserver($rauthor,$rdomain);
if ($hostname{$homsvr} ne '') {
my $roledef=
reply("get:$rdomain:$rauthor:roles:rolesdef_$rrole",
$homsvr);
if (($roledef ne 'con_lost') && ($roledef ne '')) {
my ($syspriv,$dompriv,$coursepriv)=
split(/\_/,unescape($roledef));
$allroles{'cm./'}.=':'.$syspriv;
$allroles{$spec.'./'}.=':'.$syspriv;
if ($tdomain ne '') {
$allroles{'cm./'.$tdomain.'/'}.=':'.$dompriv;
$allroles{$spec.'./'.$tdomain.'/'}.=':'.$dompriv;
if ($trest ne '') {
$allroles{'cm.'.$area}.=':'.$coursepriv;
$allroles{$spec.'.'.$area}.=':'.$coursepriv;
}
}
}
}
} else {
$allroles{'cm./'}.=':'.$pr{$trole.':s'};
$allroles{$spec.'./'}.=':'.$pr{$trole.':s'};
if ($tdomain ne '') {
$allroles{'cm./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
$allroles{$spec.'./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
if ($trest ne '') {
$allroles{'cm.'.$area}.=':'.$pr{$trole.':c'};
$allroles{$spec.'.'.$area}.=':'.$pr{$trole.':c'};
}
}
}
}
}
}
my $adv=0;
my $author=0;
foreach (keys %allroles) {
%thesepriv=();
if (($_!~/^st/) && ($_!~/^ta/) && ($_!~/^cm/)) { $adv=1; }
if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }
foreach (split(/:/,$allroles{$_})) {
if ($_ ne '') {
my ($privilege,$restrictions)=split(/&/,$_);
if ($restrictions eq '') {
$thesepriv{$privilege}='F';
} else {
if ($thesepriv{$privilege} ne 'F') {
$thesepriv{$privilege}.=$restrictions;
}
}
}
}
$thesestr='';
foreach (keys %thesepriv) { $thesestr.=':'.$_.'&'.$thesepriv{$_}; }
$userroles.='user.priv.'.$_.'='.$thesestr."\n";
}
$userroles.='user.adv='.$adv."\n".
'user.author='.$author."\n";
$ENV{'user.adv'}=$adv;
}
return $userroles;
}
# --------------------------------------------------------------- get interface
sub get {
my ($namespace,$storearr,$udomain,$uname)=@_;
my $items='';
foreach (@$storearr) {
$items.=escape($_).'&';
}
$items=~s/\&$//;
if (!$udomain) { $udomain=$ENV{'user.domain'}; }
if (!$uname) { $uname=$ENV{'user.name'}; }
my $uhome=&homeserver($uname,$udomain);
my $rep=&reply("get:$udomain:$uname:$namespace:$items",$uhome);
my @pairs=split(/\&/,$rep);
if ( $#pairs==0 && $pairs[0] =~ /^(con_lost|error|no_such_host)/i) {
return @pairs;
}
my %returnhash=();
my $i=0;
foreach (@$storearr) {
$returnhash{$_}=unescape($pairs[$i]);
$i++;
}
return %returnhash;
}
# --------------------------------------------------------------- del interface
sub del {
my ($namespace,$storearr,$udomain,$uname)=@_;
my $items='';
foreach (@$storearr) {
$items.=escape($_).'&';
}
$items=~s/\&$//;
if (!$udomain) { $udomain=$ENV{'user.domain'}; }
if (!$uname) { $uname=$ENV{'user.name'}; }
my $uhome=&homeserver($uname,$udomain);
return &reply("del:$udomain:$uname:$namespace:$items",$uhome);
}
# -------------------------------------------------------------- dump interface
sub dump {
my ($namespace,$udomain,$uname,$regexp)=@_;
if (!$udomain) { $udomain=$ENV{'user.domain'}; }
if (!$uname) { $uname=$ENV{'user.name'}; }
my $uhome=&homeserver($uname,$udomain);
if ($regexp) {
$regexp=&escape($regexp);
} else {
$regexp='.';
}
my $rep=reply("dump:$udomain:$uname:$namespace:$regexp",$uhome);
my @pairs=split(/\&/,$rep);
my %returnhash=();
foreach (@pairs) {
my ($key,$value)=split(/=/,$_);
$returnhash{unescape($key)}=unescape($value);
}
return %returnhash;
}
# --------------------------------------------------------------- currentdump
sub currentdump {
my ($courseid,$sdom,$sname)=@_;
$courseid = $ENV{'request.course.id'} if (! defined($courseid));
$sdom = $ENV{'user.domain'} if (! defined($sdom));
$sname = $ENV{'user.name'} if (! defined($sname));
my $uhome = &homeserver($sname,$sdom);
my $rep=reply('currentdump:'.$sdom.':'.$sname.':'.$courseid,$uhome);
return if ($rep =~ /^(error:|no_such_host)/);
#
my %returnhash=();
#
if ($rep eq "unknown_cmd") {
# an old lond will not know currentdump
# Do a dump and make it look like a currentdump
my @tmp = &dump($courseid,$sdom,$sname,'.');
return if ($tmp[0] =~ /^(error:|no_such_host)/);
my %hash = @tmp;
@tmp=();
# Code ripped from lond, essentially. The only difference
# here is the unescaping done by lonnet::dump(). Conceivably
# we might run in to problems with parameter names =~ /^v\./
while (my ($key,$value) = each(%hash)) {
my ($v,$symb,$param) = split(/:/,$key);
next if ($v eq 'version' || $symb eq 'keys');
next if (exists($returnhash{$symb}) &&
exists($returnhash{$symb}->{$param}) &&
$returnhash{$symb}->{'v.'.$param} > $v);
$returnhash{$symb}->{$param}=$value;
$returnhash{$symb}->{'v.'.$param}=$v;
}
#
# Remove all of the keys in the hashes which keep track of
# the version of the parameter.
while (my ($symb,$param_hash) = each(%returnhash)) {
# use a foreach because we are going to delete from the hash.
foreach my $key (keys(%$param_hash)) {
delete($param_hash->{$key}) if ($key =~ /^v\./);
}
}
} else {
my @pairs=split(/\&/,$rep);
foreach (@pairs) {
my ($key,$value)=split(/=/,$_);
my ($symb,$param) = split(/:/,$key);
$returnhash{&unescape($symb)}->{&unescape($param)} =
&unescape($value);
}
}
return %returnhash;
}
# --------------------------------------------------------------- put interface
sub put {
my ($namespace,$storehash,$udomain,$uname)=@_;
if (!$udomain) { $udomain=$ENV{'user.domain'}; }
if (!$uname) { $uname=$ENV{'user.name'}; }
my $uhome=&homeserver($uname,$udomain);
my $items='';
foreach (keys %$storehash) {
$items.=&escape($_).'='.&escape($$storehash{$_}).'&';
}
$items=~s/\&$//;
return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
}
# ------------------------------------------------------ critical put interface
sub cput {
my ($namespace,$storehash,$udomain,$uname)=@_;
if (!$udomain) { $udomain=$ENV{'user.domain'}; }
if (!$uname) { $uname=$ENV{'user.name'}; }
my $uhome=&homeserver($uname,$udomain);
my $items='';
foreach (keys %$storehash) {
$items.=escape($_).'='.escape($$storehash{$_}).'&';
}
$items=~s/\&$//;
return &critical("put:$udomain:$uname:$namespace:$items",$uhome);
}
# -------------------------------------------------------------- eget interface
sub eget {
my ($namespace,$storearr,$udomain,$uname)=@_;
my $items='';
foreach (@$storearr) {
$items.=escape($_).'&';
}
$items=~s/\&$//;
if (!$udomain) { $udomain=$ENV{'user.domain'}; }
if (!$uname) { $uname=$ENV{'user.name'}; }
my $uhome=&homeserver($uname,$udomain);
my $rep=&reply("eget:$udomain:$uname:$namespace:$items",$uhome);
my @pairs=split(/\&/,$rep);
my %returnhash=();
my $i=0;
foreach (@$storearr) {
$returnhash{$_}=unescape($pairs[$i]);
$i++;
}
return %returnhash;
}
# ------------------------------------------------- Check for a user privilege
sub allowed {
my ($priv,$uri)=@_;
my $orguri=$uri;
$uri=&declutter($uri);
# Free bre access to adm and meta resources
if ((($uri=~/^adm\//) || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {
return 'F';
}
# Free bre to public access
if ($priv eq 'bre') {
my $copyright=&metadata($uri,'copyright');
if (($copyright eq 'public') && (!$ENV{'request.course.id'})) {
return 'F';
}
if ($copyright eq 'priv') {
$uri=~/([^\/]+)\/([^\/]+)\//;
unless (($ENV{'user.name'} eq $2) && ($ENV{'user.domain'} eq $1)) {
return '';
}
}
if ($copyright eq 'domain') {
$uri=~/([^\/]+)\/([^\/]+)\//;
unless (($ENV{'user.domain'} eq $1) ||
($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $1)) {
return '';
}
}
if ($ENV{'request.role'}=~ /li\.\//) {
# Library role, so allow browsing of resources in this domain.
return 'F';
}
}
# Domain coordinator is trying to create a course
if (($priv eq 'ccc') && ($ENV{'request.role'} =~ /^dc\./)) {
# uri is the requested domain in this case.
# comparison to 'request.role.domain' shows if the user has selected
# a role of dc for the domain in question.
return 'F' if ($uri eq $ENV{'request.role.domain'});
}
my $thisallowed='';
my $statecond=0;
my $courseprivid='';
# Course
if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'}=~/$priv\&([^\:]*)/) {
$thisallowed.=$1;
}
# Domain
if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
=~/$priv\&([^\:]*)/) {
$thisallowed.=$1;
}
# Course: uri itself is a course
my $courseuri=$uri;
$courseuri=~s/\_(\d)/\/$1/;
$courseuri=~s/^([^\/])/\/$1/;
if ($ENV{'user.priv.'.$ENV{'request.role'}.'.'.$courseuri}
=~/$priv\&([^\:]*)/) {
$thisallowed.=$1;
}
# URI is an uploaded document for this course
if (($priv eq 'bre') &&
($uri=~/^uploaded\/$ENV{'course.'.$ENV{'request.course.id'}.'.domain'}\/$ENV{'course.'.$ENV{'request.course.id'}.'.num'}/)) {
return 'F';
}
# Full access at system, domain or course-wide level? Exit.
if ($thisallowed=~/F/) {
return 'F';
}
# If this is generating or modifying users, exit with special codes
if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:cca:'=~/\:$priv\:/) {
return $thisallowed;
}
#
# Gathered so far: system, domain and course wide privileges
#
# Course: See if uri or referer is an individual resource that is part of
# the course
if ($ENV{'request.course.id'}) {
$courseprivid=$ENV{'request.course.id'};
if ($ENV{'request.course.sec'}) {
$courseprivid.='/'.$ENV{'request.course.sec'};
}
$courseprivid=~s/\_/\//;
my $checkreferer=1;
my ($match,$cond)=&is_on_map($uri);
if ($match) {
$statecond=$cond;
if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
=~/$priv\&([^\:]*)/) {
$thisallowed.=$1;
$checkreferer=0;
}
}
if ($checkreferer) {
my $refuri=$ENV{'httpref.'.$orguri};
unless ($refuri) {
foreach (keys %ENV) {
if ($_=~/^httpref\..*\*/) {
my $pattern=$_;
$pattern=~s/^httpref\.\/res\///;
$pattern=~s/\*/\[\^\/\]\+/g;
$pattern=~s/\//\\\//g;
if ($orguri=~/$pattern/) {
$refuri=$ENV{$_};
}
}
}
}
if ($refuri) {
$refuri=&declutter($refuri);
my ($match,$cond)=&is_on_map($refuri);
if ($match) {
my $refstatecond=$cond;
if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
=~/$priv\&([^\:]*)/) {
$thisallowed.=$1;
$uri=$refuri;
$statecond=$refstatecond;
}
}
}
}
}
#
# Gathered now: all privileges that could apply, and condition number
#
#
# Full or no access?
#
if ($thisallowed=~/F/) {
return 'F';
}
unless ($thisallowed) {
return '';
}
# Restrictions exist, deal with them
#
# C:according to course preferences
# R:according to resource settings
# L:unless locked
# X:according to user session state
#
# Possibly locked functionality, check all courses
# Locks might take effect only after 10 minutes cache expiration for other
# courses, and 2 minutes for current course
my $envkey;
if ($thisallowed=~/L/) {
foreach $envkey (keys %ENV) {
if ($envkey=~/^user\.role\.(st|ta)\.([^\.]*)/) {
my $courseid=$2;
my $roleid=$1.'.'.$2;
$courseid=~s/^\///;
my $expiretime=600;
if ($ENV{'request.role'} eq $roleid) {
$expiretime=120;
}
my ($cdom,$cnum,$csec)=split(/\//,$courseid);
my $prefix='course.'.$cdom.'_'.$cnum.'.';
if ((time-$ENV{$prefix.'last_cache'})>$expiretime) {
&coursedescription($courseid);
}
if (($ENV{$prefix.'res.'.$uri.'.lock.sections'}=~/\,$csec\,/)
|| ($ENV{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {
if ($ENV{$prefix.'res.'.$uri.'.lock.expire'}>time) {
&log($ENV{'user.domain'},$ENV{'user.name'},
$ENV{'user.home'},
'Locked by res: '.$priv.' for '.$uri.' due to '.
$cdom.'/'.$cnum.'/'.$csec.' expire '.
$ENV{$prefix.'priv.'.$priv.'.lock.expire'});
return '';
}
}
if (($ENV{$prefix.'priv.'.$priv.'.lock.sections'}=~/\,$csec\,/)
|| ($ENV{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {
if ($ENV{'priv.'.$priv.'.lock.expire'}>time) {
&log($ENV{'user.domain'},$ENV{'user.name'},
$ENV{'user.home'},
'Locked by priv: '.$priv.' for '.$uri.' due to '.
$cdom.'/'.$cnum.'/'.$csec.' expire '.
$ENV{$prefix.'priv.'.$priv.'.lock.expire'});
return '';
}
}
}
}
}
#
# Rest of the restrictions depend on selected course
#
unless ($ENV{'request.course.id'}) {
return '1';
}
#
# Now user is definitely in a course
#
# Course preferences
if ($thisallowed=~/C/) {
my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
my $unamedom=$ENV{'user.name'}.':'.$ENV{'user.domain'};
if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.roles.denied'}
=~/$rolecode/) {
&log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.
$ENV{'request.course.id'});
return '';
}
if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.users.denied'}
=~/$unamedom/) {
&log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
'Denied by user: '.$priv.' for '.$uri.' as '.$unamedom.' in '.
$ENV{'request.course.id'});
return '';
}
}
# Resource preferences
if ($thisallowed=~/R/) {
my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
my $filename=$perlvar{'lonDocRoot'}.'/res/'.$uri.'.meta';
if (-e $filename) {
my @content;
{
my $fh=Apache::File->new($filename);
@content=<$fh>;
}
if (join('',@content)=~
/\]*\>[^\<]*$rolecode[^\<]*\<\/roledeny\>/) {
&log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);
return '';
}
}
}
# Restricted by state or randomout?
if ($thisallowed=~/X/) {
if ($ENV{'acc.randomout'}) {
my $symb=&symbread($uri,1);
if (($symb) && ($ENV{'acc.randomout'}=~/\&$symb\&/)) {
return '';
}
}
if (&condval($statecond)) {
return '2';
} else {
return '';
}
}
return 'F';
}
# --------------------------------------------------- Is a resource on the map?
sub is_on_map {
my $uri=&declutter(shift);
my @uriparts=split(/\//,$uri);
my $filename=$uriparts[$#uriparts];
my $pathname=$uri;
$pathname=~s|/\Q$filename\E$||;
$pathname=~s/^adm\/wrapper\///;
#Trying to find the conditional for the file
my $match=($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
/\&\Q$filename\E\:([\d\|]+)\&/);
if ($match) {
return (1,$1);
} else {
return (0,0);
}
}
# ----------------------------------------------------------------- Define Role
sub definerole {
if (allowed('mcr','/')) {
my ($rolename,$sysrole,$domrole,$courole)=@_;
foreach (split('/',$sysrole)) {
my ($crole,$cqual)=split(/\&/,$_);
if ($pr{'cr:s'}!~/$crole/) { return "refused:s:$crole"; }
if ($pr{'cr:s'}=~/$crole\&/) {
if ($pr{'cr:s'}!~/$crole\&\w*$cqual/) {
return "refused:s:$crole&$cqual";
}
}
}
foreach (split('/',$domrole)) {
my ($crole,$cqual)=split(/\&/,$_);
if ($pr{'cr:d'}!~/$crole/) { return "refused:d:$crole"; }
if ($pr{'cr:d'}=~/$crole\&/) {
if ($pr{'cr:d'}!~/$crole\&\w*$cqual/) {
return "refused:d:$crole&$cqual";
}
}
}
foreach (split('/',$courole)) {
my ($crole,$cqual)=split(/\&/,$_);
if ($pr{'cr:c'}!~/$crole/) { return "refused:c:$crole"; }
if ($pr{'cr:c'}=~/$crole\&/) {
if ($pr{'cr:c'}!~/$crole\&\w*$cqual/) {
return "refused:c:$crole&$cqual";
}
}
}
my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
"$ENV{'user.domain'}:$ENV{'user.name'}:".
"rolesdef_$rolename=".
escape($sysrole.'_'.$domrole.'_'.$courole);
return reply($command,$ENV{'user.home'});
} else {
return 'refused';
}
}
# ---------------- Make a metadata query against the network of library servers
sub metadata_query {
my ($query,$custom,$customshow,$server_array)=@_;
my %rhash;
my @server_list = (defined($server_array) ? @$server_array
: keys(%libserv) );
for my $server (@server_list) {
unless ($custom or $customshow) {
my $reply=&reply("querysend:".&escape($query),$server);
$rhash{$server}=$reply;
}
else {
my $reply=&reply("querysend:".&escape($query).':'.
&escape($custom).':'.&escape($customshow),
$server);
$rhash{$server}=$reply;
}
}
return \%rhash;
}
# ----------------------------------------- Send log queries and wait for reply
sub log_query {
my ($uname,$udom,$query,%filters)=@_;
my $uhome=&homeserver($uname,$udom);
if ($uhome eq 'no_host') { return 'error: no_host'; }
my $uhost=$hostname{$uhome};
my $command=&escape(join(':',map{$_.'='.$filters{$_}} keys %filters));
my $queryid=&reply("querysend:".$query.':'.$udom.':'.$uname.':'.$command,
$uhome);
unless ($queryid=~/^$uhost\_/) { return 'error: '.$queryid; }
return get_query_reply($queryid);
}
sub get_query_reply {
my $queryid=shift;
my $replyfile=$perlvar{'lonDaemons'}.'/tmp/'.$queryid;
my $reply='';
for (1..100) {
sleep 2;
if (-e $replyfile.'.end') {
if (my $fh=Apache::File->new($replyfile)) {
$reply.=<$fh>;
$fh->close;
} else { return 'error: reply_file_error'; }
return &unescape($reply);
}
}
return 'timeout:'.$queryid;
}
sub courselog_query {
#
# possible filters:
# url: url or symb
# username
# domain
# action: view, submit, grade
# start: timestamp
# end: timestamp
#
my (%filters)=@_;
unless ($ENV{'request.course.id'}) { return 'no_course'; }
if ($filters{'url'}) {
$filters{'url'}=&symbclean(&declutter($filters{'url'}));
$filters{'url'}=~s/\.(\w+)$/(\\.\\d+)*\\.$1/;
$filters{'url'}=~s/\.(\w+)\_\_\_/(\\.\\d+)*\\.$1/;
}
my $cname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
return &log_query($cname,$cdom,'courselog',%filters);
}
sub userlog_query {
my ($uname,$udom,%filters)=@_;
return &log_query($uname,$udom,'userlog',%filters);
}
# ------------------------------------------------------------------ Plain Text
sub plaintext {
my $short=shift;
return $prp{$short};
}
# ----------------------------------------------------------------- Assign Role
sub assignrole {
my ($udom,$uname,$url,$role,$end,$start)=@_;
my $mrole;
if ($role =~ /^cr\//) {
unless (&allowed('ccr',$url)) {
&logthis('Refused custom assignrole: '.
$udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
$ENV{'user.name'}.' at '.$ENV{'user.domain'});
return 'refused';
}
$mrole='cr';
} else {
my $cwosec=$url;
$cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
unless (&allowed('c'.$role,$cwosec)) {
&logthis('Refused assignrole: '.
$udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
$ENV{'user.name'}.' at '.$ENV{'user.domain'});
return 'refused';
}
$mrole=$role;
}
my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
"$udom:$uname:$url".'_'."$mrole=$role";
if ($end) { $command.='_'.$end; }
if ($start) {
if ($end) {
$command.='_'.$start;
} else {
$command.='_0_'.$start;
}
}
return &reply($command,&homeserver($uname,$udom));
}
# -------------------------------------------------- Modify user authentication
# Overrides without validation
sub modifyuserauth {
my ($udom,$uname,$umode,$upass)=@_;
my $uhome=&homeserver($uname,$udom);
unless (&allowed('mau',$udom)) { return 'refused'; }
&logthis('Call to modify user authentication '.$udom.', '.$uname.', '.
$umode.' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'}.
' in domain '.$ENV{'request.role.domain'});
my $reply=&reply('encrypt:changeuserauth:'.$udom.':'.$uname.':'.$umode.':'.
&escape($upass),$uhome);
&log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},
'Authentication changed for '.$udom.', '.$uname.', '.$umode.
'(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
&log($udom,,$uname,$uhome,
'Authentication changed by '.$ENV{'user.domain'}.', '.
$ENV{'user.name'}.', '.$umode.
'(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
unless ($reply eq 'ok') {
&logthis('Authentication mode error: '.$reply);
return 'error: '.$reply;
}
return 'ok';
}
# --------------------------------------------------------------- Modify a user
sub modifyuser {
my ($udom, $uname, $uid,
$umode, $upass, $first,
$middle, $last, $gene,
$forceid, $desiredhome)=@_;
$udom=~s/\W//g;
$uname=~s/\W//g;
&logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.
$umode.', '.$first.', '.$middle.', '.
$last.', '.$gene.'(forceid: '.$forceid.')'.
(defined($desiredhome) ? ' desiredhome = '.$desiredhome :
' desiredhome not specified').
' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'}.
' in domain '.$ENV{'request.role.domain'});
my $uhome=&homeserver($uname,$udom,'true');
# ----------------------------------------------------------------- Create User
if (($uhome eq 'no_host') && ($umode) && ($upass)) {
my $unhome='';
if (defined($desiredhome) && $hostdom{$desiredhome} eq $udom) {
$unhome = $desiredhome;
} elsif($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $udom) {
$unhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
} else { # load balancing routine for determining $unhome
my $tryserver;
my $loadm=10000000;
foreach $tryserver (keys %libserv) {
if ($hostdom{$tryserver} eq $udom) {
my $answer=reply('load',$tryserver);
if (($answer=~/\d+/) && ($answer<$loadm)) {
$loadm=$answer;
$unhome=$tryserver;
}
}
}
}
if (($unhome eq '') || ($unhome eq 'no_host')) {
return 'error: unable to find a home server for '.$uname.
' in domain '.$udom;
}
my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':'.$umode.':'.
&escape($upass),$unhome);
unless ($reply eq 'ok') {
return 'error: '.$reply;
}
$uhome=&homeserver($uname,$udom,'true');
if (($uhome eq '') || ($uhome eq 'no_host') || ($uhome ne $unhome)) {
return 'error: verify home';
}
} # End of creation of new user
# ---------------------------------------------------------------------- Add ID
if ($uid) {
$uid=~tr/A-Z/a-z/;
my %uidhash=&idrget($udom,$uname);
if (($uidhash{$uname}) && ($uidhash{$uname}!~/error\:/)
&& (!$forceid)) {
unless ($uid eq $uidhash{$uname}) {
return 'error: mismatch '.$uidhash{$uname}.' versus '.$uid;
}
} else {
&idput($udom,($uname => $uid));
}
}
# -------------------------------------------------------------- Add names, etc
my @tmp=&get('environment',
['firstname','middlename','lastname','generation'],
$udom,$uname);
my %names;
if ($tmp[0] =~ m/^error:.*/) {
%names=();
} else {
%names = @tmp;
}
if ($first) { $names{'firstname'} = $first; }
if ($middle) { $names{'middlename'} = $middle; }
if ($last) { $names{'lastname'} = $last; }
if ($gene) { $names{'generation'} = $gene; }
my $reply = &put('environment', \%names, $udom,$uname);
if ($reply ne 'ok') { return 'error: '.$reply; }
&logthis('Success modifying user '.$udom.', '.$uname.', '.$uid.', '.
$umode.', '.$first.', '.$middle.', '.
$last.', '.$gene.' by '.
$ENV{'user.name'}.' at '.$ENV{'user.domain'});
return 'ok';
}
# -------------------------------------------------------------- Modify student
sub modifystudent {
my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,
$end,$start,$forceid,$desiredhome)=@_;
my $cid='';
unless ($cid=$ENV{'request.course.id'}) {
return 'not_in_class';
}
# --------------------------------------------------------------- Make the user
my $reply=&modifyuser
($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$forceid,
$desiredhome);
unless ($reply eq 'ok') { return $reply; }
# This will cause &modify_student_enrollment to get the uid from the
# students environment
$uid = undef if (!$forceid);
$reply = &modify_student_enrollment($udom,$uname,$uid,$first,$middle,
$last,$gene,$usec,$end,$start);
return $reply;
}
sub modify_student_enrollment {
my ($udom,$uname,$uid,$first,$middle,$last,$gene,$usec,$end,$start) = @_;
# Get the course id from the environment
my $cid='';
unless ($cid=$ENV{'request.course.id'}) {
return 'not_in_class';
}
# Make sure the user exists
my $uhome=&homeserver($uname,$udom);
if (($uhome eq '') || ($uhome eq 'no_host')) {
return 'error: no such user';
}
#
# Get student data if we were not given enough information
if (!defined($first) || $first eq '' ||
!defined($last) || $last eq '' ||
!defined($uid) || $uid eq '' ||
!defined($middle) || $middle eq '' ||
!defined($gene) || $gene eq '') {
# They did not supply us with enough data to enroll the student, so
# we need to pick up more information.
my %tmp = &get('environment',
['firstname','middlename','lastname', 'generation','id']
,$udom,$uname);
foreach (keys(%tmp)) {
&logthis("key $_ = ".$tmp{$_});
}
$first = $tmp{'firstname'} if (!defined($first) || $first eq '');
$middle = $tmp{'middlename'} if (!defined($middle) || $middle eq '');
$last = $tmp{'lastname'} if (!defined($last) || $last eq '');
$gene = $tmp{'generation'} if (!defined($gene) || $gene eq '');
$uid = $tmp{'id'} if (!defined($uid) || $uid eq '');
}
my $fullname = &Apache::loncoursedata::ProcessFullName($last,$gene,
$first,$middle);
my $reply=critical('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
$ENV{'course.'.$cid.'.num'}.':classlist:'.
&escape($uname.':'.$udom).'='.
&escape(join(':',$end,$start,$uid,$usec,$fullname)),
$ENV{'course.'.$cid.'.home'});
unless (($reply eq 'ok') || ($reply eq 'delayed')) {
return 'error: '.$reply;
}
# Add student role to user
my $uurl='/'.$cid;
$uurl=~s/\_/\//g;
if ($usec) {
$uurl.='/'.$usec;
}
return &assignrole($udom,$uname,$uurl,'st',$end,$start);
}
# ------------------------------------------------- Write to course preferences
sub writecoursepref {
my ($courseid,%prefs)=@_;
$courseid=~s/^\///;
$courseid=~s/\_/\//g;
my ($cdomain,$cnum)=split(/\//,$courseid);
my $chome=homeserver($cnum,$cdomain);
if (($chome eq '') || ($chome eq 'no_host')) {
return 'error: no such course';
}
my $cstring='';
foreach (keys %prefs) {
$cstring.=escape($_).'='.escape($prefs{$_}).'&';
}
$cstring=~s/\&$//;
return reply('put:'.$cdomain.':'.$cnum.':environment:'.$cstring,$chome);
}
# ---------------------------------------------------------- Make/modify course
sub createcourse {
my ($udom,$description,$url,$course_server,$nonstandard)=@_;
$url=&declutter($url);
my $cid='';
unless (&allowed('ccc',$udom)) {
return 'refused';
}
# ------------------------------------------------------------------- Create ID
my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
# ----------------------------------------------- Make sure that does not exist
my $uhome=&homeserver($uname,$udom,'true');
unless (($uhome eq '') || ($uhome eq 'no_host')) {
$uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
$uhome=&homeserver($uname,$udom,'true');
unless (($uhome eq '') || ($uhome eq 'no_host')) {
return 'error: unable to generate unique course-ID';
}
}
# ------------------------------------------------ Check supplied server name
$course_server = $ENV{'user.homeserver'} if (! defined($course_server));
if (! exists($libserv{$course_server})) {
return 'error:bad server name '.$course_server;
}
# ------------------------------------------------------------- Make the course
my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
$course_server);
unless ($reply eq 'ok') { return 'error: '.$reply; }
$uhome=&homeserver($uname,$udom,'true');
if (($uhome eq '') || ($uhome eq 'no_host')) {
return 'error: no such course';
}
# ----------------------------------------------------------------- Course made
my $topurl=$url;
unless ($nonstandard) {
# ------------------------------------------ For standard courses, make top url
my $mapurl=&clutter($url);
if ($mapurl eq '/res/') { $mapurl=''; }
$ENV{'form.initmap'}=(<
ENDINITMAP
$topurl=&declutter(
&finishuserfileupload($uname,$udom,$uhome,'initmap','default.sequence')
);
}
# ----------------------------------------------------------- Write preferences
&writecoursepref($udom.'_'.$uname,
('description' => $description,
'url' => $topurl));
return '/'.$udom.'/'.$uname;
}
# ---------------------------------------------------------- Assign Custom Role
sub assigncustomrole {
my ($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start)=@_;
return &assignrole($udom,$uname,$url,'cr/'.$rdom.'/'.$rnam.'/'.$rolename,
$end,$start);
}
# ----------------------------------------------------------------- Revoke Role
sub revokerole {
my ($udom,$uname,$url,$role)=@_;
my $now=time;
return &assignrole($udom,$uname,$url,$role,$now);
}
# ---------------------------------------------------------- Revoke Custom Role
sub revokecustomrole {
my ($udom,$uname,$url,$rdom,$rnam,$rolename)=@_;
my $now=time;
return &assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$now);
}
# ------------------------------------------------------------ Directory lister
sub dirlist {
my ($uri,$userdomain,$username,$alternateDirectoryRoot)=@_;
$uri=~s/^\///;
$uri=~s/\/$//;
my ($udom, $uname);
(undef,$udom,$uname)=split(/\//,$uri);
if(defined($userdomain)) {
$udom = $userdomain;
}
if(defined($username)) {
$uname = $username;
}
my $dirRoot = $perlvar{'lonDocRoot'};
if(defined($alternateDirectoryRoot)) {
$dirRoot = $alternateDirectoryRoot;
$dirRoot =~ s/\/$//;
}
if($udom) {
if($uname) {
my $listing=reply('ls:'.$dirRoot.'/'.$uri,
homeserver($uname,$udom));
return split(/:/,$listing);
} elsif(!defined($alternateDirectoryRoot)) {
my $tryserver;
my %allusers=();
foreach $tryserver (keys %libserv) {
if($hostdom{$tryserver} eq $udom) {
my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.
$udom, $tryserver);
if (($listing ne 'no_such_dir') && ($listing ne 'empty')
&& ($listing ne 'con_lost')) {
foreach (split(/:/,$listing)) {
my ($entry,@stat)=split(/&/,$_);
$allusers{$entry}=1;
}
}
}
}
my $alluserstr='';
foreach (sort keys %allusers) {
$alluserstr.=$_.'&user:';
}
$alluserstr=~s/:$//;
return split(/:/,$alluserstr);
} else {
my @emptyResults = ();
push(@emptyResults, 'missing user name');
return split(':',@emptyResults);
}
} elsif(!defined($alternateDirectoryRoot)) {
my $tryserver;
my %alldom=();
foreach $tryserver (keys %libserv) {
$alldom{$hostdom{$tryserver}}=1;
}
my $alldomstr='';
foreach (sort keys %alldom) {
$alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
}
$alldomstr=~s/:$//;
return split(/:/,$alldomstr);
} else {
my @emptyResults = ();
push(@emptyResults, 'missing domain');
return split(':',@emptyResults);
}
}
# --------------------------------------------- GetFileTimestamp
# This function utilizes dirlist and returns the date stamp for
# when it was last modified. It will also return an error of -1
# if an error occurs
sub GetFileTimestamp {
my ($studentDomain,$studentName,$filename,$root)=@_;
$studentDomain=~s/\W//g;
$studentName=~s/\W//g;
my $subdir=$studentName.'__';
$subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
my $proname="$studentDomain/$subdir/$studentName";
$proname .= '/'.$filename;
my @dir = &Apache::lonnet::dirlist($proname, $studentDomain, $studentName,
$root);
my $fileStat = $dir[0];
my @stats = split('&', $fileStat);
if($stats[0] ne 'empty' && $stats[0] ne 'no_such_dir') {
return $stats[9];
} else {
return -1;
}
}
# -------------------------------------------------------- Value of a Condition
sub directcondval {
my $number=shift;
if ($ENV{'user.state.'.$ENV{'request.course.id'}}) {
return substr($ENV{'user.state.'.$ENV{'request.course.id'}},$number,1);
} else {
return 2;
}
}
sub condval {
my $condidx=shift;
my $result=0;
my $allpathcond='';
foreach (split(/\|/,$condidx)) {
if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_})) {
$allpathcond.=
'('.$ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_}.')|';
}
}
$allpathcond=~s/\|$//;
if ($ENV{'request.course.id'}) {
if ($allpathcond) {
my $operand='|';
my @stack;
foreach ($allpathcond=~/(\d+|\(|\)|\&|\|)/g) {
if ($_ eq '(') {
push @stack,($operand,$result)
} elsif ($_ eq ')') {
my $before=pop @stack;
if (pop @stack eq '&') {
$result=$result>$before?$before:$result;
} else {
$result=$result>$before?$result:$before;
}
} elsif (($_ eq '&') || ($_ eq '|')) {
$operand=$_;
} else {
my $new=directcondval($_);
if ($operand eq '&') {
$result=$result>$new?$new:$result;
} else {
$result=$result>$new?$result:$new;
}
}
}
}
}
return $result;
}
# ---------------------------------------------------- Devalidate courseresdata
sub devalidatecourseresdata {
my ($coursenum,$coursedomain)=@_;
my $hashid=$coursenum.':'.$coursedomain;
delete $courseresdatacache{$hashid.'.time'};
}
# --------------------------------------------------- Course Resourcedata Query
sub courseresdata {
my ($coursenum,$coursedomain,@which)=@_;
my $coursehom=&homeserver($coursenum,$coursedomain);
my $hashid=$coursenum.':'.$coursedomain;
my $dodump=0;
if (!defined($courseresdatacache{$hashid.'.time'})) {
$dodump=1;
} else {
if (time-$courseresdatacache{$hashid.'.time'}>300) { $dodump=1; }
}
if ($dodump) {
my %dumpreply=&dump('resourcedata',$coursedomain,$coursenum);
my ($tmp) = keys(%dumpreply);
if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
$courseresdatacache{$hashid.'.time'}=time;
$courseresdatacache{$hashid}=\%dumpreply;
} elsif ($tmp =~ /^(con_lost|no_such_host)/) {
return $tmp;
}
}
foreach my $item (@which) {
if (defined($courseresdatacache{$hashid}->{$item})) {
return $courseresdatacache{$hashid}->{$item};
}
}
return undef;
}
# --------------------------------------------------------- Value of a Variable
sub EXT {
my ($varname,$symbparm,$udom,$uname,)=@_;
unless ($varname) { return ''; }
#get real user name/domain, courseid and symb
my $courseid;
if (!($uname && $udom)) {
(my $cursymb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
if (!$symbparm) { $symbparm=$cursymb; }
} else {
$courseid=$ENV{'request.course.id'};
}
my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
my $rest;
if (defined($therest[0])) {
$rest=join('.',@therest);
} else {
$rest='';
}
my $qualifierrest=$qualifier;
if ($rest) { $qualifierrest.='.'.$rest; }
my $spacequalifierrest=$space;
if ($qualifierrest) { $spacequalifierrest.='.'.$qualifierrest; }
if ($realm eq 'user') {
# --------------------------------------------------------------- user.resource
if ($space eq 'resource') {
if (defined($Apache::lonhomework::parsing_a_problem)) {
return $Apache::lonhomework::history{$qualifierrest};
} else {
my %restored=&restore($symbparm,$courseid,$udom,$uname);
return $restored{$qualifierrest};
}
# ----------------------------------------------------------------- user.access
} elsif ($space eq 'access') {
# FIXME - not supporting calls for a specific user
return &allowed($qualifier,$rest);
# ------------------------------------------ user.preferences, user.environment
} elsif (($space eq 'preferences') || ($space eq 'environment')) {
if (($uname eq $ENV{'user.name'}) &&
($udom eq $ENV{'user.domain'})) {
return $ENV{join('.',('environment',$qualifierrest))};
} else {
my %returnhash=&userenvironment($udom,$uname,$qualifierrest);
return $returnhash{$qualifierrest};
}
# ----------------------------------------------------------------- user.course
} elsif ($space eq 'course') {
# FIXME - not supporting calls for a specific user
return $ENV{join('.',('request.course',$qualifier))};
# ------------------------------------------------------------------- user.role
} elsif ($space eq 'role') {
# FIXME - not supporting calls for a specific user
my ($role,$where)=split(/\./,$ENV{'request.role'});
if ($qualifier eq 'value') {
return $role;
} elsif ($qualifier eq 'extent') {
return $where;
}
# ----------------------------------------------------------------- user.domain
} elsif ($space eq 'domain') {
return $udom;
# ------------------------------------------------------------------- user.name
} elsif ($space eq 'name') {
return $uname;
# ---------------------------------------------------- Any other user namespace
} else {
my %reply=&get($space,[$qualifierrest],$udom,$uname);
return $reply{$qualifierrest};
}
} elsif ($realm eq 'query') {
# ---------------------------------------------- pull stuff out of query string
&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},[$space]);
return $ENV{'form.'.$space};
} elsif ($realm eq 'request') {
# ------------------------------------------------------------- request.browser
if ($space eq 'browser') {
return $ENV{'browser.'.$qualifier};
# ------------------------------------------------------------ request.filename
} else {
return $ENV{'request.'.$spacequalifierrest};
}
} elsif ($realm eq 'course') {
# ---------------------------------------------------------- course.description
return $ENV{'course.'.$courseid.'.'.$spacequalifierrest};
} elsif ($realm eq 'resource') {
if ($courseid eq $ENV{'request.course.id'}) {
#print ' '.$space.' - '.$qualifier.' - '.$spacequalifierrest;
# ----------------------------------------------------- Cascading lookup scheme
if (!$symbparm) { $symbparm=&symbread(); }
my $symbp=$symbparm;
my $mapp=(split(/\_\_\_/,$symbp))[0];
my $symbparm=$symbp.'.'.$spacequalifierrest;
my $mapparm=$mapp.'___(all).'.$spacequalifierrest;
my $section;
if (($ENV{'user.name'} eq $uname) &&
($ENV{'user.domain'} eq $udom)) {
$section=$ENV{'request.course.sec'};
} else {
$section=&usection($udom,$uname,$courseid);
}
my $seclevel=$courseid.'.['.$section.'].'.$spacequalifierrest;
my $seclevelr=$courseid.'.['.$section.'].'.$symbparm;
my $seclevelm=$courseid.'.['.$section.'].'.$mapparm;
my $courselevel=$courseid.'.'.$spacequalifierrest;
my $courselevelr=$courseid.'.'.$symbparm;
my $courselevelm=$courseid.'.'.$mapparm;
# ----------------------------------------------------------- first, check user
#most student don't have any data set, check if there is some data
#every thirty minutes
if (!
(exists($ENV{'cache.studentresdata'})
&& (($ENV{'cache.studentresdata'}+1800) > time))) {
my %resourcedata=&get('resourcedata',
[$courselevelr,$courselevelm,$courselevel],
$udom,$uname);
my ($tmp)=keys(%resourcedata);
if (($tmp!~/^error\:/) && ($tmp!~/^con_lost/)) {
if ($resourcedata{$courselevelr}) {
return $resourcedata{$courselevelr}; }
if ($resourcedata{$courselevelm}) {
return $resourcedata{$courselevelm}; }
if ($resourcedata{$courselevel}) {
return $resourcedata{$courselevel}; }
} else {
if ($tmp!~/No such file/) {
&logthis("WARNING:".
" Trying to get resource data for ".
$uname." at ".$udom.": ".
$tmp."");
} elsif ($tmp=~/error:No such file/) {
$ENV{'cache.studentresdata'}=time;
&appenv(('cache.studentresdata'=>
$ENV{'cache.studentresdata'}));
} elsif ($tmp =~ /^(con_lost|no_such_host)/) {
return $tmp;
}
}
}
# -------------------------------------------------------- second, check course
my $coursereply=&courseresdata($ENV{'course.'.$courseid.'.num'},
$ENV{'course.'.$courseid.'.domain'},
($seclevelr,$seclevelm,$seclevel,
$courselevelr,$courselevelm,
$courselevel));
if (defined($coursereply)) { return $coursereply; }
# ------------------------------------------------------ third, check map parms
my %parmhash=();
my $thisparm='';
if (tie(%parmhash,'GDBM_File',
$ENV{'request.course.fn'}.'_parms.db',
&GDBM_READER(),0640)) {
$thisparm=$parmhash{$symbparm};
untie(%parmhash);
}
if ($thisparm) { return $thisparm; }
}
# --------------------------------------------- last, look in resource metadata
$spacequalifierrest=~s/\./\_/;
my $filename;
if (!$symbparm) { $symbparm=&symbread(); }
if ($symbparm) {
$filename=(split(/\_\_\_/,$symbparm))[2];
} else {
$filename=$ENV{'request.filename'};
}
my $metadata=&metadata($filename,$spacequalifierrest);
if (defined($metadata)) { return $metadata; }
$metadata=&metadata($filename,'parameter_'.$spacequalifierrest);
if (defined($metadata)) { return $metadata; }
# ------------------------------------------------------------------ Cascade up
unless ($space eq '0') {
my @parts=split(/_/,$space);
my $id=pop(@parts);
my $part=join('_',@parts);
if ($part eq '') { $part='0'; }
my $partgeneral=&EXT('resource.'.$part.'.'.$qualifierrest,
$symbparm,$udom,$uname);
if (defined($partgeneral)) { return $partgeneral; }
}
# ---------------------------------------------------- Any other user namespace
} elsif ($realm eq 'environment') {
# ----------------------------------------------------------------- environment
if (($uname eq $ENV{'user.name'})&&($udom eq $ENV{'user.domain'})) {
return $ENV{'environment.'.$spacequalifierrest};
} else {
my %returnhash=&userenvironment($udom,$uname,
$spacequalifierrest);
return $returnhash{$spacequalifierrest};
}
} elsif ($realm eq 'system') {
# ----------------------------------------------------------------- system.time
if ($space eq 'time') {
return time;
}
}
return '';
}
sub add_prefix_and_part {
my ($prefix,$part)=@_;
my $keyroot;
if (defined($prefix) && $prefix !~ /^__/) {
# prefix that has a part already
$keyroot=$prefix;
} elsif (defined($prefix)) {
# prefix that is missing a part
if (defined($part)) { $keyroot='_'.$part.substr($prefix,1); }
} else {
# no prefix at all
if (defined($part)) { $keyroot='_'.$part; }
}
return $keyroot;
}
# ---------------------------------------------------------------- Get metadata
sub metadata {
my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
$uri=&declutter($uri);
# if it is a non metadata possible uri return quickly
if (($uri eq '') || (($uri =~ m|^/*adm/|) && ($uri !~ m|^adm/includes|)) ||
($uri =~ m|/$|) || ($uri =~ m|/.meta$|)) {
return '';
}
my $filename=$uri;
$uri=~s/\.meta$//;
#
# Is the metadata already cached?
# Look at timestamp of caching
# Everything is cached by the main uri, libraries are never directly cached
#
unless (abs($metacache{$uri.':cachedtimestamp'}-time)<600 && !defined($liburi)) {
#
# Is this a recursive call for a library?
#
if ($liburi) {
$liburi=&declutter($liburi);
$filename=$liburi;
}
my %metathesekeys=();
unless ($filename=~/\.meta$/) { $filename.='.meta'; }
my $metastring=&getfile(&filelocation('',&clutter($filename)));
my $parser=HTML::LCParser->new(\$metastring);
my $token;
undef %metathesekeys;
while ($token=$parser->get_token) {
if ($token->[0] eq 'S') {
if (defined($token->[2]->{'package'})) {
#
# This is a package - get package info
#
my $package=$token->[2]->{'package'};
my $keyroot=&add_prefix_and_part($prefix,$token->[2]->{'part'});
if (defined($token->[2]->{'id'})) {
$keyroot.='_'.$token->[2]->{'id'};
}
if ($metacache{$uri.':packages'}) {
$metacache{$uri.':packages'}.=','.$package.$keyroot;
} else {
$metacache{$uri.':packages'}=$package.$keyroot;
}
foreach (keys %packagetab) {
if ($_=~/^$package\&/) {
my ($pack,$name,$subp)=split(/\&/,$_);
my $value=$packagetab{$_};
my $part=$keyroot;
$part=~s/^\_//;
if ($subp eq 'display') {
$value.=' [Part: '.$part.']';
}
my $unikey='parameter'.$keyroot.'_'.$name;
$metathesekeys{$unikey}=1;
$metacache{$uri.':'.$unikey.'.part'}=$part;
unless (defined($metacache{$uri.':'.$unikey.'.'.$subp})) {
$metacache{$uri.':'.$unikey.'.'.$subp}=$value;
}
if (defined($metacache{$uri.':'.$unikey.'.default'})) {
$metacache{$uri.':'.$unikey}=
$metacache{$uri.':'.$unikey.'.default'}
}
}
}
} else {
#
# This is not a package - some other kind of start tag
#
my $entry=$token->[1];
my $unikey;
if ($entry eq 'import') {
$unikey='';
} else {
$unikey=$entry;
}
$unikey.=&add_prefix_and_part($prefix,$token->[2]->{'part'});
if (defined($token->[2]->{'id'})) {
$unikey.='_'.$token->[2]->{'id'};
}
if ($entry eq 'import') {
#
# Importing a library here
#
if ($depthcount<20) {
my $location=$parser->get_text('/import');
my $dir=$filename;
$dir=~s|[^/]*$||;
$location=&filelocation($dir,$location);
foreach (sort(split(/\,/,&metadata($uri,'keys',
$location,$unikey,
$depthcount+1)))) {
$metathesekeys{$_}=1;
}
}
} else {
if (defined($token->[2]->{'name'})) {
$unikey.='_'.$token->[2]->{'name'};
}
$metathesekeys{$unikey}=1;
foreach (@{$token->[3]}) {
$metacache{$uri.':'.$unikey.'.'.$_}=$token->[2]->{$_};
}
my $internaltext=&HTML::Entities::decode($parser->get_text('/'.$entry));
my $default=$metacache{$uri.':'.$unikey.'.default'};
if ( $internaltext =~ /^\s*$/ && $default !~ /^\s*$/) {
# only ws inside the tag, and not in default, so use default
# as value
$metacache{$uri.':'.$unikey}=$default;
} else {
# either something interesting inside the tag or default
# uninteresting
$metacache{$uri.':'.$unikey}=$internaltext;
}
# end of not-a-package not-a-library import
}
# end of not-a-package start tag
}
# the next is the end of "start tag"
}
}
# are there custom rights to evaluate
if ($metacache{$uri.':copyright'} eq 'custom') {
#
# Importing a rights file here
#
unless ($depthcount) {
my $location=$metacache{$uri.':customdistributionfile'};
my $dir=$filename;
$dir=~s|[^/]*$||;
$location=&filelocation($dir,$location);
foreach (sort(split(/\,/,&metadata($uri,'keys',
$location,'_rights',
$depthcount+1)))) {
$metathesekeys{$_}=1;
}
}
}
$metacache{$uri.':keys'}=join(',',keys %metathesekeys);
&metadata_generate_part0(\%metathesekeys,\%metacache,$uri);
$metacache{$uri.':allpossiblekeys'}=join(',',keys %metathesekeys);
$metacache{$uri.':cachedtimestamp'}=time;
# this is the end of "was not already recently cached
}
return $metacache{$uri.':'.$what};
}
sub metadata_generate_part0 {
my ($metadata,$metacache,$uri) = @_;
my %allnames;
foreach my $metakey (sort keys %$metadata) {
if ($metakey=~/^parameter\_(.*)/) {
my $part=$$metacache{$uri.':'.$metakey.'.part'};
my $name=$$metacache{$uri.':'.$metakey.'.name'};
if (! exists($$metadata{'parameter_0_'.$name})) {
$allnames{$name}=$part;
}
}
}
foreach my $name (keys(%allnames)) {
$$metadata{"parameter_0_$name"}=1;
my $key="$uri:parameter_0_$name";
$$metacache{"$key.part"}='0';
$$metacache{"$key.name"}=$name;
$$metacache{"$key.type"}=$$metacache{$uri.':parameter_'.
$allnames{$name}.'_'.$name.
'.type'};
my $olddis=$$metacache{$uri.':parameter_'.$allnames{$name}.'_'.$name.
'.display'};
my $expr='\\[Part: '.$allnames{$name}.'\\]';
$olddis=~s/$expr/\[Part: 0\]/;
$$metacache{"$key.display"}=$olddis;
}
}
# ------------------------------------------------- Get the title of a resource
sub gettitle {
my $urlsymb=shift;
my $symb=&symbread($urlsymb);
unless ($symb) {
unless ($urlsymb) { $urlsymb=$ENV{'request.filename'}; }
return &metadata($urlsymb,'title');
}
if ($titlecache{$symb}) { return $titlecache{$symb}; }
my ($map,$resid,$url)=split(/\_\_\_/,$symb);
my $title='';
my %bighash;
if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
&GDBM_READER(),0640)) {
my $mapid=$bighash{'map_pc_'.&clutter($map)};
$title=$bighash{'title_'.$mapid.'.'.$resid};
untie %bighash;
}
if ($title) {
$titlecache{$symb}=$title;
return $title;
} else {
return &metadata($urlsymb,'title');
}
}
# ------------------------------------------------- Update symbolic store links
sub symblist {
my ($mapname,%newhash)=@_;
$mapname=declutter($mapname);
my %hash;
if (($ENV{'request.course.fn'}) && (%newhash)) {
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
&GDBM_WRCREAT(),0640)) {
foreach (keys %newhash) {
$hash{declutter($_)}=$mapname.'___'.$newhash{$_};
}
if (untie(%hash)) {
return 'ok';
}
}
}
return 'error';
}
# --------------------------------------------------------------- Verify a symb
sub symbverify {
my ($symb,$thisfn)=@_;
$thisfn=&declutter($thisfn);
# direct jump to resource in page or to a sequence - will construct own symbs
if ($thisfn=~/\.(page|sequence)$/) { return 1; }
# check URL part
my ($map,$resid,$url)=split(/\_\_\_/,$symb);
unless (&symbclean($url) eq &symbclean($thisfn)) { return 0; }
$symb=&symbclean($symb);
my %bighash;
my $okay=0;
if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
&GDBM_READER(),0640)) {
my $ids=$bighash{'ids_'.&clutter($thisfn)};
unless ($ids) {
$ids=$bighash{'ids_/'.$thisfn};
}
if ($ids) {
# ------------------------------------------------------------------- Has ID(s)
foreach (split(/\,/,$ids)) {
my ($mapid,$resid)=split(/\./,$_);
if (
&symbclean(&declutter($bighash{'map_id_'.$mapid}).'___'.$resid.'___'.$thisfn)
eq $symb) {
$okay=1;
}
}
}
untie(%bighash);
}
return $okay;
}
# --------------------------------------------------------------- Clean-up symb
sub symbclean {
my $symb=shift;
# remove version from map
$symb=~s/\.(\d+)\.(\w+)\_\_\_/\.$2\_\_\_/;
# remove version from URL
$symb=~s/\.(\d+)\.(\w+)$/\.$2/;
return $symb;
}
# ------------------------------------------------------ Return symb list entry
sub symbread {
my ($thisfn,$donotrecurse)=@_;
# no filename provided? try from environment
unless ($thisfn) {
if ($ENV{'request.symb'}) { return &symbclean($ENV{'request.symb'}); }
$thisfn=$ENV{'request.filename'};
}
# is that filename actually a symb? Verify, clean, and return
if ($thisfn=~/\_\_\_\d+\_\_\_(.*)$/) {
if (&symbverify($thisfn,$1)) { return &symbclean($thisfn); }
}
$thisfn=declutter($thisfn);
my %hash;
my %bighash;
my $syval='';
if (($ENV{'request.course.fn'}) && ($thisfn)) {
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
&GDBM_READER(),0640)) {
$syval=$hash{$thisfn};
untie(%hash);
}
# ---------------------------------------------------------- There was an entry
if ($syval) {
unless ($syval=~/\_\d+$/) {
unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {
&appenv('request.ambiguous' => $thisfn);
return '';
}
$syval.=$1;
}
} else {
# ------------------------------------------------------- Was not in symb table
if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
&GDBM_READER(),0640)) {
# ---------------------------------------------- Get ID(s) for current resource
my $ids=$bighash{'ids_'.&clutter($thisfn)};
unless ($ids) {
$ids=$bighash{'ids_/'.$thisfn};
}
unless ($ids) {
# alias?
$ids=$bighash{'mapalias_'.$thisfn};
}
if ($ids) {
# ------------------------------------------------------------------- Has ID(s)
my @possibilities=split(/\,/,$ids);
if ($#possibilities==0) {
# ----------------------------------------------- There is only one possibility
my ($mapid,$resid)=split(/\./,$ids);
$syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;
} elsif (!$donotrecurse) {
# ------------------------------------------ There is more than one possibility
my $realpossible=0;
foreach (@possibilities) {
my $file=$bighash{'src_'.$_};
if (&allowed('bre',$file)) {
my ($mapid,$resid)=split(/\./,$_);
if ($bighash{'map_type_'.$mapid} ne 'page') {
$realpossible++;
$syval=declutter($bighash{'map_id_'.$mapid}).
'___'.$resid;
}
}
}
if ($realpossible!=1) { $syval=''; }
} else {
$syval='';
}
}
untie(%bighash)
}
}
if ($syval) {
return &symbclean($syval.'___'.$thisfn);
}
}
&appenv('request.ambiguous' => $thisfn);
return '';
}
# ---------------------------------------------------------- Return random seed
sub numval {
my $txt=shift;
$txt=~tr/A-J/0-9/;
$txt=~tr/a-j/0-9/;
$txt=~tr/K-T/0-9/;
$txt=~tr/k-t/0-9/;
$txt=~tr/U-Z/0-5/;
$txt=~tr/u-z/0-5/;
$txt=~s/\D//g;
return int($txt);
}
sub rndseed {
my ($symb,$courseid,$domain,$username)=@_;
if (!$symb) {
unless ($symb=&symbread()) { return time; }
}
if (!$courseid) { $courseid=$ENV{'request.course.id'};}
if (!$domain) {$domain=$ENV{'user.domain'};}
if (!$username) {$username=$ENV{'user.name'};}
{
use integer;
my $symbchck=unpack("%32C*",$symb) << 27;
my $symbseed=numval($symb) << 22;
my $namechck=unpack("%32C*",$username) << 17;
my $nameseed=numval($username) << 12;
my $domainseed=unpack("%32C*",$domain) << 7;
my $courseseed=unpack("%32C*",$courseid);
my $num=$symbseed+$nameseed+$domainseed+$courseseed+$namechck+$symbchck;
#uncommenting these lines can break things!
#&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
#&Apache::lonxml::debug("rndseed :$num:$symb");
return $num;
}
}
sub ireceipt {
my ($funame,$fudom,$fucourseid,$fusymb)=@_;
my $cuname=unpack("%32C*",$funame);
my $cudom=unpack("%32C*",$fudom);
my $cucourseid=unpack("%32C*",$fucourseid);
my $cusymb=unpack("%32C*",$fusymb);
my $cunique=unpack("%32C*",$perlvar{'lonReceipt'});
return unpack("%32C*",$perlvar{'lonHostID'}).'-'.
($cunique%$cuname+
$cunique%$cudom+
$cusymb%$cuname+
$cusymb%$cudom+
$cucourseid%$cuname+
$cucourseid%$cudom);
}
sub receipt {
my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
return &ireceipt($name,$domain,$courseid,$symb);
}
# ------------------------------------------------------------ Serves up a file
# returns either the contents of the file or a -1
sub getfile {
my $file=shift;
if ($file=~/^\/*uploaded\//) { # user file
my $ua=new LWP::UserAgent;
my $request=new HTTP::Request('GET',&tokenwrapper($file));
my $response=$ua->request($request);
if ($response->is_success()) {
return $response->content;
} else {
return -1;
}
} else { # normal file from res space
&repcopy($file);
if (! -e $file ) { return -1; };
my $fh=Apache::File->new($file);
my $a='';
while (<$fh>) { $a .=$_; }
return $a;
}
}
sub filelocation {
my ($dir,$file) = @_;
my $location;
$file=~ s/^\s*(\S+)\s*$/$1/; ## strip off leading and trailing spaces
if ($file=~m:^/~:) { # is a contruction space reference
$location = $file;
$location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
} elsif ($file=~/^\/*uploaded/) { # is an uploaded file
$location=$file;
} else {
$file=~s/^$perlvar{'lonDocRoot'}//;
$file=~s:^/*res::;
if ( !( $file =~ m:^/:) ) {
$location = $dir. '/'.$file;
} else {
$location = '/home/httpd/html/res'.$file;
}
}
$location=~s://+:/:g; # remove duplicate /
while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
return $location;
}
sub hreflocation {
my ($dir,$file)=@_;
unless (($file=~/^http:\/\//i) || ($file=~/^\//)) {
my $finalpath=filelocation($dir,$file);
$finalpath=~s/^\/home\/httpd\/html//;
$finalpath=~s-/home/(\w+)/public_html/-/~$1/-;
return $finalpath;
} else {
return $file;
}
}
# ------------------------------------------------------------- Declutters URLs
sub declutter {
my $thisfn=shift;
$thisfn=~s/^$perlvar{'lonDocRoot'}//;
$thisfn=~s/^\///;
$thisfn=~s/^res\///;
$thisfn=~s/\?.+$//;
return $thisfn;
}
# ------------------------------------------------------------- Clutter up URLs
sub clutter {
my $thisfn='/'.&declutter(shift);
unless ($thisfn=~/^\/(uploaded|adm|userfiles|ext|raw|priv)\//) {
$thisfn='/res'.$thisfn;
}
return $thisfn;
}
# -------------------------------------------------------- Escape Special Chars
sub escape {
my $str=shift;
$str =~ s/(\W)/"%".unpack('H2',$1)/eg;
return $str;
}
# ----------------------------------------------------- Un-Escape Special Chars
sub unescape {
my $str=shift;
$str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
return $str;
}
# ================================================================ Main Program
sub goodbye {
&logthis("Starting Shut down");
&flushcourselogs();
&logthis("Shutting down");
}
BEGIN {
# ----------------------------------- Read loncapa.conf and loncapa_apache.conf
unless ($readit) {
{
my $config=Apache::File->new("/etc/httpd/conf/loncapa.conf");
while (my $configline=<$config>) {
if ($configline =~ /^[^\#]*PerlSetVar/) {
my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
chomp($varvalue);
$perlvar{$varname}=$varvalue;
}
}
}
{
my $config=Apache::File->new("/etc/httpd/conf/loncapa_apache.conf");
while (my $configline=<$config>) {
if ($configline =~ /^[^\#]*PerlSetVar/) {
my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
chomp($varvalue);
$perlvar{$varname}=$varvalue;
}
}
}
# ------------------------------------------------------------ Read domain file
{
my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.
'/domain.tab');
%domaindescription = ();
%domain_auth_def = ();
%domain_auth_arg_def = ();
if ($fh) {
while (<$fh>) {
next if /^\#/;
chomp;
my ($domain, $domain_description, $def_auth, $def_auth_arg)
= split(/:/,$_,4);
$domain_auth_def{$domain}=$def_auth;
$domain_auth_arg_def{$domain}=$def_auth_arg;
$domaindescription{$domain}=$domain_description;
# &logthis("Domain.tab: $domain, $domain_auth_def{$domain}, $domain_auth_arg_def{$domain},$domaindescription{$domain}");
# &logthis("Domain.tab: $domain ".$domaindescription{$domain} );
}
}
}
# ------------------------------------------------------------- Read hosts file
{
my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
while (my $configline=<$config>) {
next if ($configline =~ /^(\#|\s*$)/);
chomp($configline);
my ($id,$domain,$role,$name,$ip,$domdescr)=split(/:/,$configline);
if ($id && $domain && $role && $name && $ip) {
$hostname{$id}=$name;
$hostdom{$id}=$domain;
$hostip{$id}=$ip;
$iphost{$ip}=$id;
if ($role eq 'library') { $libserv{$id}=$name; }
} else {
if ($configline) {
&logthis("Skipping hosts.tab line -$configline-");
}
}
}
}
# ------------------------------------------------------ Read spare server file
{
my $config=Apache::File->new("$perlvar{'lonTabDir'}/spare.tab");
while (my $configline=<$config>) {
chomp($configline);
if ($configline) {
$spareid{$configline}=1;
}
}
}
# ------------------------------------------------------------ Read permissions
{
my $config=Apache::File->new("$perlvar{'lonTabDir'}/roles.tab");
while (my $configline=<$config>) {
chomp($configline);
if ($configline) {
my ($role,$perm)=split(/ /,$configline);
if ($perm ne '') { $pr{$role}=$perm; }
}
}
}
# -------------------------------------------- Read plain texts for permissions
{
my $config=Apache::File->new("$perlvar{'lonTabDir'}/rolesplain.tab");
while (my $configline=<$config>) {
chomp($configline);
if ($configline) {
my ($short,$plain)=split(/:/,$configline);
if ($plain ne '') { $prp{$short}=$plain; }
}
}
}
# ---------------------------------------------------------- Read package table
{
my $config=Apache::File->new("$perlvar{'lonTabDir'}/packages.tab");
while (my $configline=<$config>) {
chomp($configline);
my ($short,$plain)=split(/:/,$configline);
my ($pack,$name)=split(/\&/,$short);
if ($plain ne '') {
$packagetab{$pack.'&'.$name.'&name'}=$name;
$packagetab{$short}=$plain;
}
}
}
# ------------- set up temporary directory
{
$tmpdir = $perlvar{'lonDaemons'}.'/tmp/';
}
%metacache=();
$processmarker='_'.time.'_'.$perlvar{'lonHostID'};
$dumpcount=0;
&logtouch();
&logthis('INFO: Read configuration');
$readit=1;
}
}
1;
__END__
=pod
=head1 NAME
Apache::lonnet - Subroutines to ask questions about things in the network.
=head1 SYNOPSIS
Invoked by other LON-CAPA modules, when they need to talk to or about objects in the network.
&Apache::lonnet::SUBROUTINENAME(ARGUMENTS);
Common parameters:
=over 4
=item *
$uname : an internal username (if $cname expecting a course Id specifically)
=item *
$udom : a domain (if $cdom expecting a course's domain specifically)
=item *
$symb : a resource instance identifier
=item *
$namespace : the name of a .db file that contains the data needed or
being set.
=back
=head1 INTRODUCTION
This module provides subroutines which interact with the
lonc/lond (TCP) network layer of LON-CAPA. And Can be used to ask about
- classes
- users
- resources
For many of these objects you can also use this to store data about
them or modify them in various ways.
This is part of the LearningOnline Network with CAPA project
described at http://www.lon-capa.org.
=head1 RETURN MESSAGES
=over 4
=item *
con_lost : unable to contact remote host
=item *
con_delayed : unable to contact remote host, message will be delivered
when the connection is brought back up
=item *
con_failed : unable to contact remote host and unable to save message
for later delivery
=item *
error: : an error a occured, a description of the error follows the :
=item *
no_such_host : unable to fund a host associated with the user/domain
that was requested
=back
=head1 PUBLIC SUBROUTINES
=head2 Session Environment Functions
=over 4
=item *
appenv(%hash) : the value of %hash is written to the user envirnoment
file, and will be restored for each access this user makes during this
session, also modifies the %ENV for the current process
=item *
delenv($regexp) : removes all items from the session environment file that matches the regular expression in $regexp. The values are also delted from the current processes %ENV.
=back
=head2 User Information
=over 4
=item *
queryauthenticate($uname,$udom) : try to determine user's current
authentication scheme
=item *
authenticate($uname,$upass,$udom) : try to authenticate user from domain's lib
servers (first use the current one), $upass should be the users password
=item *
homeserver($uname,$udom) : find the server which has the user's
directory and files (there must be only one), this caches the answer,
and also caches if there is a borken connection.
=item *
idget($udom,@ids) : find the usernames behind a list of IDs (IDs are a
unique resource in a domain, there must be only 1 ID per username, and
only 1 username per ID in a specific domain) (returns hash:
id=>name,id=>name)
=item *
idrget($udom,@unames) : find the IDs behind a list of usernames (returns hash:
name=>id,name=>id)
=item *
idput($udom,%ids) : store away a list of names and associated IDs
=item *
rolesinit($udom,$username,$authhost) : get user privileges
=item *
usection($udom,$uname,$cname) : finds the section of student in the
course $cname, return section name/number or '' for "not in course"
and '-1' for "no section"
=item *
userenvironment($udom,$uname,@what) : gets the values of the keys
passed in @what from the requested user's environment, returns a hash
=back
=head2 User Roles
=over 4
=item *
allowed($priv,$uri) : check for a user privilege; returns codes for allowed
actions
F: full access
U,I,K: authentication modes (cxx only)
'': forbidden
1: user needs to choose course
2: browse allowed
=item *
definerole($rolename,$sysrole,$domrole,$courole) : define role; define a custom
role rolename set privileges in format of lonTabs/roles.tab for system, domain,
and course level
=item *
plaintext($short) : return value in %prp hash (rolesplain.tab); plain text
explanation of a user role term
=back
=head2 User Modification
=over 4
=item *
assignrole($udom,$uname,$url,$role,$end,$start) : assign role; give a role to a
user for the level given by URL. Optional start and end dates (leave empty
string or zero for "no date")
=item *
changepass($uname,$udom,$currentpass,$newpass,$server) : attempts to
change a users, password, possible return values are: ok,
pwchange_failure, non_authorized, auth_mode_error, unknown_user,
refused
=item *
modifyuserauth($udom,$uname,$umode,$upass) : modify user authentication
=item *
modifyuser($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene) :
modify user
=item *
modifystudent
modify a students enrollment and identification information.
The course id is resolved based on the current users environment.
This means the envoking user must be a course coordinator or otherwise
associated with a course.
This call is essentially a wrapper for lonnet::modifyuser and
lonnet::modify_student_enrollment
Inputs:
=over 4
=item B<$udom> Students loncapa domain
=item B<$uname> Students loncapa login name
=item B<$uid> Students id/student number
=item B<$umode> Students authentication mode
=item B<$upass> Students password
=item B<$first> Students first name
=item B<$middle> Students middle name
=item B<$last> Students last name
=item B<$gene> Students generation
=item B<$usec> Students section in course
=item B<$end> Unix time of the roles expiration
=item B<$start> Unix time of the roles start date
=item B<$forceid> If defined, allow $uid to be changed
=item B<$desiredhome> server to use as home server for student
=back
=item *
modify_student_enrollment
Change a students enrollment status in a class. The environment variable
'role.request.course' must be defined for this function to proceed.
Inputs:
=over 4
=item $udom, students domain
=item $uname, students name
=item $uid, students user id
=item $first, students first name
=item $middle
=item $last
=item $gene
=item $usec
=item $end
=item $start
=back
=item *
assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start) : assign
custom role; give a custom role to a user for the level given by URL. Specify
name and domain of role author, and role name
=item *
revokerole($udom,$uname,$url,$role) : revoke a role for url
=item *
revokecustomrole($udom,$uname,$url,$role) : revoke a custom role
=back
=head2 Course Infomation
=over 4
=item *
coursedescription($courseid) : course description
=item *
courseresdata($coursenum,$coursedomain,@which) : request for current
parameter setting for a specific course, @what should be a list of
parameters to ask about. This routine caches answers for 5 minutes.
=back
=head2 Course Modification
=over 4
=item *
writecoursepref($courseid,%prefs) : write preferences (environment
database) for a course
=item *
createcourse($udom,$description,$url) : make/modify course
=back
=head2 Resource Subroutines
=over 4
=item *
subscribe($fname) : subscribe to a resource, returns URL if possible (probably should use repcopy instead)
=item *
repcopy($filename) : subscribes to the requested file, and attempts to
replicate from the owning library server, Might return
HTTP_SERVICE_UNAVAILABLE, HTTP_NOT_FOUND, FORBIDDEN, OK, or
HTTP_BAD_REQUEST, also attempts to grab the metadata for the
resource. Expects the local filesystem pathname
(/home/httpd/html/res/....)
=back
=head2 Resource Information
=over 4
=item *
EXT($varname,$symb,$udom,$uname) : evaluates and returns the value of
a vairety of different possible values, $varname should be a request
string, and the other parameters can be used to specify who and what
one is asking about.
Possible values for $varname are environment.lastname (or other item
from the envirnment hash), user.name (or someother aspect about the
user), resource.0.maxtries (or some other part and parameter of a
resource)
=item *
directcondval($number) : get current value of a condition; reads from a state
string
=item *
condval($condidx) : value of condition index based on state
=item *
metadata($uri,$what,$liburi,$prefix,$depthcount) : request a
resource's metadata, $what should be either a specific key, or either
'keys' (to get a list of possible keys) or 'packages' to get a list of
packages that this resource currently uses, the last 3 arguments are only used internally for recursive metadata.
this function automatically caches all requests
=item *
metadata_query($query,$custom,$customshow) : make a metadata query against the
network of library servers; returns file handle of where SQL and regex results
will be stored for query
=item *
symbread($filename) : return symbolic list entry (filename argument optional);
returns the data handle
=item *
symbverify($symb,$thisfn) : verifies that $symb actually exists and is
a possible symb for the URL in $thisfn, returns a 1 on success, 0 on
failure, user must be in a course, as it assumes the existance of the
course initi hash, and uses $ENV('request.course.id'}
=item *
symbclean($symb) : removes versions numbers from a symb, returns the
cleaned symb
=item *
is_on_map($uri) : checks if the $uri is somewhere on the current
course map, user must be in a course for it to work.
=item *
numval($salt) : return random seed value (addend for rndseed)
=item *
rndseed($symb,$courseid,$udom,$uname) : create a random sum; returns
a random seed, all arguments are optional, if they aren't sent it uses the
environment to derive them. Note: if symb isn't sent and it can't get one
from &symbread it will use the current time as its return value
=item *
ireceipt($funame,$fudom,$fucourseid,$fusymb) : return unique,
unfakeable, receipt
=item *
receipt() : API to ireceipt working off of ENV values; given out to users
=item *
countacc($url) : count the number of accesses to a given URL
=item *
checkout($symb,$tuname,$tudom,$tcrsid) : creates a record of a user having looked at an item, most likely printed out or otherwise using a resource
=item *
checkin($token) : updates that a resource has beeen returned (a hard copy version for instance) and returns the data that $token was Checkout with ($symb, $tuname, $tudom, and $tcrsid)
=item *
expirespread($uname,$udom,$stype,$usymb) : set expire date for spreadsheet
=item *
devalidate($symb) : devalidate temporary spreadsheet calculations,
forcing spreadsheet to reevaluate the resource scores next time.
=back
=head2 Storing/Retreiving Data
=over 4
=item *
store($storehash,$symb,$namespace,$udom,$uname) : stores hash permanently
for this url; hashref needs to be given and should be a \%hashname; the
remaining args aren't required and if they aren't passed or are '' they will
be derived from the ENV
=item *
cstore($storehash,$symb,$namespace,$udom,$uname) : same as store but
uses critical subroutine
=item *
restore($symb,$namespace,$udom,$uname) : returns hash for this symb;
all args are optional
=item *
tmpstore($storehash,$symb,$namespace,$udom,$uname) : storage that
works very similar to store/cstore, but all data is stored in a
temporary location and can be reset using tmpreset, $storehash should
be a hash reference, returns nothing on success
=item *
tmprestore($symb,$namespace,$udom,$uname) : storage that works very
similar to restore, but all data is stored in a temporary location and
can be reset using tmpreset. Returns a hash of values on success,
error string otherwise.
=item *
tmpreset($symb,$namespace,$udom,$uname) : temporary storage reset,
deltes all keys for $symb form the temporary storage hash.
=item *
get($namespace,$storearr,$udom,$uname) : returns hash with keys from array
reference filled in from namesp ($udom and $uname are optional)
=item *
del($namespace,$storearr,$udom,$uname) : deletes keys out of array from
namesp ($udom and $uname are optional)
=item *
dump($namespace,$udom,$uname,$regexp) :
dumps the complete (or key matching regexp) namespace into a hash
($udom, $uname and $regexp are optional)
=item *
put($namespace,$storehash,$udom,$uname) : stores hash in namesp
($udom and $uname are optional)
=item *
cput($namespace,$storehash,$udom,$uname) : critical put
($udom and $uname are optional)
=item *
eget($namespace,$storearr,$udom,$uname) : returns hash with keys from array
reference filled in from namesp (encrypts the return communication)
($udom and $uname are optional)
=item *
log($udom,$name,$home,$message) : write to permanent log for user; use
critical subroutine
=back
=head2 Network Status Functions
=over 4
=item *
dirlist($uri) : return directory list based on URI
=item *
spareserver() : find server with least workload from spare.tab
=back
=head2 Apache Request
=over 4
=item *
ssi($url,%hash) : server side include, does a complete request cycle on url to
localhost, posts hash
=back
=head2 Data to String to Data
=over 4
=item *
hash2str(%hash) : convert a hash into a string complete with escaping and '='
and '&' separators, supports elements that are arrayrefs and hashrefs
=item *
hashref2str($hashref) : convert a hashref into a string complete with
escaping and '=' and '&' separators, supports elements that are
arrayrefs and hashrefs
=item *
arrayref2str($arrayref) : convert an arrayref into a string complete
with escaping and '&' separators, supports elements that are arrayrefs
and hashrefs
=item *
str2hash($string) : convert string to hash using unescaping and
splitting on '=' and '&', supports elements that are arrayrefs and
hashrefs
=item *
str2array($string) : convert string to hash using unescaping and
splitting on '&', supports elements that are arrayrefs and hashrefs
=back
=head2 Logging Routines
=over 4
These routines allow one to make log messages in the lonnet.log and
lonnet.perm logfiles.
=item *
logtouch() : make sure the logfile, lonnet.log, exists
=item *
logthis() : append message to the normal lonnet.log file, it gets
preiodically rolled over and deleted.
=item *
logperm() : append a permanent message to lonnet.perm.log, this log
file never gets deleted by any automated portion of the system, only
messages of critical importance should go in here.
=back
=head2 General File Helper Routines
=over 4
=item *
getfile($file) : returns the entire contents of a file or -1; it
properly subscribes to and replicates the file if neccessary.
=item *
filelocation($dir,$file) : returns file system location of a file
based on URI; meant to be "fairly clean" absolute reference, $dir is a
directory that relative $file lookups are to looked in ($dir of /a/dir
and a file of ../bob will become /a/bob)
=item *
hreflocation($dir,$file) : returns file system location or a URL; same as
filelocation except for hrefs
=item *
declutter() : declutters URLs (remove docroot, beginning slashes, 'res' etc)
=back
=head2 HTTP Helper Routines
=over 4
=item *
escape() : unpack non-word characters into CGI-compatible hex codes
=item *
unescape() : pack CGI-compatible hex codes into actual non-word ASCII character
=back
=head1 PRIVATE SUBROUTINES
=head2 Underlying communication routines (Shouldn't call)
=over 4
=item *
subreply() : tries to pass a message to lonc, returns con_lost if incapable
=item *
reply() : uses subreply to send a message to remote machine, logs all failures
=item *
critical() : passes a critical message to another server; if cannot
get through then place message in connection buffer directory and
returns con_delayed, if incapable of saving message, returns
con_failed
=item *
reconlonc() : tries to reconnect lonc client processes.
=back
=head2 Resource Access Logging
=over 4
=item *
flushcourselogs() : flush (save) buffer logs and access logs
=item *
courselog($what) : save message for course in hash
=item *
courseacclog($what) : save message for course using &courselog(). Perform
special processing for specific resource types (problems, exams, quizzes, etc).
=item *
goodbye() : flush course logs and log shutting down; it is called in srm.conf
as a PerlChildExitHandler
=back
=head2 Other
=over 4
=item *
symblist($mapname,%newhash) : update symbolic storage links
=back
=cut