# The LearningOnline Network
# TCP networking package
#
# Functions for use by content handlers:
#
# plaintext(short) : plain text explanation of short term
# fileembstyle(ext) : embed style in page for file extension
# filedescription(ext) : descriptor text for file extension
# allowed(short,url) : 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
# definerole(rolename,sys,dom,cou) : define a custom role rolename
# set priviledges in format of lonTabs/roles.tab for
# system, domain and course level,
# assignrole(udom,uname,url,role,end,start) : 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")
# assigncustomrole (udom,uname,url,rdom,rnam,rolename,end,start) : give a
# custom role to a user for the level given by url.
# Specify name and domain of role author, and role name
# revokerole (udom,uname,url,role) : Revoke a role for url
# revokecustomrole (udom,uname,url,rdom,rnam,rolename) : Revoke a custom role
# appenv(hash) : adds hash to session environment
# delenv(varname) : deletes all environment entries starting with varname
# store(hash) : stores hash permanently for this url
# cstore(hash) : critical store
# restore : returns hash for this url
# eget(namesp,array) : returns hash with keys from array filled in from namesp
# get(namesp,array) : returns hash with keys from array filled in from namesp
# del(namesp,array) : deletes keys out of array from namesp
# put(namesp,hash) : stores hash in namesp
# cput(namesp,hash) : critical put
# dump(namesp) : dumps the complete namespace into a hash
# ssi(url,hash) : does a complete request cycle on url to localhost, posts
# hash
# coursedescription(id) : returns and caches course description for id
# repcopy(filename) : replicate file
# dirlist(url) : gets a directory listing
# directcondval(index) : reading condition value of single condition from
# state string
# condval(index) : value of condition index based on state
# EXT(name) : value of a variable
# symblist(map,hash) : Updates symbolic storage links
# symbread([filename]) : returns the data handle (filename optional)
# rndseed() : returns a random seed
# receipt() : returns a receipt to be given out to users
# getfile(filename) : returns the contents of filename, or a -1 if it can't
# be found, replicates and subscribes to the file
# filelocation(dir,file) : returns a farily clean absolute reference to file
# from the directory dir
# hreflocation(dir,file) : same as filelocation, but for hrefs
# log(domain,user,home,msg) : write to permanent log for user
# usection(domain,user,courseid) : output of section name/number or '' for
# "not in course" and '-1' for "no section"
# userenvironment(domain,user,what) : puts out any environment parameter
# for a user
# idput(domain,hash) : writes IDs for users from hash (name=>id,name=>id)
# idget(domain,array): returns hash with usernames (id=>name,id=>name) for
# an array of IDs
# idrget(domain,array): returns hash with IDs for usernames (name=>id,...) for
# an array of names
# metadata(file,entry): returns the metadata entry for a file. entry='keys'
# returns a comma separated list of keys
#
# 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 Gerd Kortemeyer
package Apache::lonnet;
use strict;
use Apache::File;
use LWP::UserAgent();
use HTTP::Headers;
use vars
qw(%perlvar %hostname %homecache %spareid %hostdom %libserv %pr %prp %fe %fd $readit %metacache);
use IO::Socket;
use GDBM_File;
use Apache::Constants qw(:common :http);
use HTML::TokeParser;
# --------------------------------------------------------------------- Logging
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)=@_;
my $answer=subreply($cmd,$server);
if ($answer eq 'con_lost') { $answer=subreply($cmd,$server); }
if (($answer=~/^refused/) || ($answer=~/^rejected/)) {
&logthis("<font color=blue>WARNING:".
" $cmd to $server returned $answer</font>");
}
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(
"<font color=blue>WARNING: $peerfile still not there, giving up</font>");
} else {
&logthis(
"<font color=blue>WARNING:".
" lonc at pid $loncpid not responding, giving up</font>");
}
} else {
&logthis('<font color=blue>WARNING: lonc not running, giving up</font>');
}
}
# ------------------------------------------------------ Critical communication
sub critical {
my ($cmd,$server)=@_;
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/$now.$middlename.$server";
{
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("<font color=blue>WARNING: ".
"Connection buffer $dfilename: $cmd</font>");
&logperm("D:$server:$cmd");
return 'con_delayed';
} else {
&logthis("<font color=red>CRITICAL:"
." Critical connection failed: $server $cmd</font>");
&logperm("F:$server:$cmd");
return 'con_failed';
}
}
}
return $answer;
}
# ---------------------------------------------------------- Append Environment
sub appenv {
my %newenv=@_;
map {
if (($newenv{$_}=~/^user\.role/) || ($newenv{$_}=~/^user\.priv/)) {
&logthis("<font color=blue>WARNING: ".
"Attempt to modify environment ".$_." to ".$newenv{$_});
delete($newenv{$_});
} else {
$ENV{$_}=$newenv{$_};
}
} keys %newenv;
my @oldenv;
{
my $fh;
unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
return 'error';
}
@oldenv=<$fh>;
}
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";
}
}
return 'ok';
}
# ----------------------------------------------------- Delete from Environment
sub delenv {
my $delthis=shift;
my %newenv=();
if (($delthis=~/user\.role/) || ($delthis=~/user\.priv/)) {
&logthis("<font color=blue>WARNING: ".
"Attempt to delete from environment ".$delthis);
return 'error';
}
my @oldenv;
{
my $fh;
unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
return 'error';
}
@oldenv=<$fh>;
}
{
my $fh;
unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
return 'error';
}
map {
unless ($_=~/^$delthis/) { print $fh $_; }
} @oldenv;
}
return 'ok';
}
# ------------------------------ Find server with least workload from spare.tab
sub spareserver {
my $tryserver;
my $spareserver='';
my $lowestserver=100;
foreach $tryserver (keys %spareid) {
my $answer=reply('load',$tryserver);
if (($answer =~ /\d/) && ($answer<$lowestserver)) {
$spareserver="http://$hostname{$tryserver}";
$lowestserver=$answer;
}
}
return $spareserver;
}
# --------- Try to authenticate user from domain's lib servers (first this one)
sub authenticate {
my ($uname,$upass,$udom)=@_;
$upass=escape($upass);
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)=@_;
my $index="$uname:$udom";
if ($homecache{$index}) { return "$homecache{$index}"; }
my $tryserver;
foreach $tryserver (keys %libserv) {
if ($hostdom{$tryserver} eq $udom) {
my $answer=reply("home:$udom:$uname",$tryserver);
if ($answer eq 'found') {
$homecache{$index}=$tryserver;
return $tryserver;
}
}
}
return 'no_host';
}
# ------------------------------------- Find the usernames behind a list of IDs
sub idget {
my ($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=();
map {
$returnhash{$_}=(&userenvironment($udom,$_,'id'))[1];
} @unames;
return %returnhash;
}
# ------------------------------- Store away a list of names and associated IDs
sub idput {
my ($udom,%ids)=@_;
my %servers=();
map {
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);
}
} keys %ids;
map {
&critical('idput:'.$udom.':'.$servers{$_},$_);
} keys %servers;
}
# ------------------------------------- Find the section of student in a course
sub usection {
my ($udom,$unam,$courseid)=@_;
$courseid=~s/\_/\//g;
$courseid=~s/^(\w)/\/$1/;
map {
my ($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 $section; }
}
} split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
&homeserver($unam,$udom)));
return '-1';
}
# ------------------------------------- Read an entry from a user's environment
sub userenvironment {
my ($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;
}
# ----------------------------- Subscribe to a resource, return URL if possible
sub subscribe {
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') || ($home eq $perlvar{'lonHostID'})) {
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;
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 @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("<font color=blue>WARNING:"
." LWP get: $message: $filename</font>");
return HTTP_SERVICE_UNAVAILABLE;
} else {
if ($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(
"<font color=yellow>INFO: No metadata: $filename</font>");
}
}
rename($transname,$filename);
return OK;
}
}
}
# --------------------------------------------------------- Server Side Include
sub ssi {
my ($fn,%form)=@_;
my $ua=new LWP::UserAgent;
my $request;
if (%form) {
$request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);
$request->content(join '&', map { "$_=$form{$_}" } 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 $response->content;
}
# ------------------------------------------------------------------------- Log
sub log {
my ($dom,$nam,$hom,$what)=@_;
return critical("log:$dom:$nam:$what",$hom);
}
# ----------------------------------------------------------------------- Store
sub store {
my %storehash=@_;
my $symb;
unless ($symb=escape(&symbread())) { return ''; }
my $namespace;
unless ($namespace=$ENV{'request.course.id'}) { return ''; }
my $namevalue='';
map {
$namevalue.=escape($_).'='.escape($storehash{$_}).'&';
} keys %storehash;
$namevalue=~s/\&$//;
return reply(
"store:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb:$namevalue",
"$ENV{'user.home'}");
}
# -------------------------------------------------------------- Critical Store
sub cstore {
my %storehash=@_;
my $symb;
unless ($symb=escape(&symbread())) { return ''; }
my $namespace;
unless ($namespace=$ENV{'request.course.id'}) { return ''; }
my $namevalue='';
map {
$namevalue.=escape($_).'='.escape($storehash{$_}).'&';
} keys %storehash;
$namevalue=~s/\&$//;
return critical(
"store:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb:$namevalue",
"$ENV{'user.home'}");
}
# --------------------------------------------------------------------- Restore
sub restore {
my $symb;
unless ($symb=escape(&symbread())) { return ''; }
my $namespace;
unless ($namespace=$ENV{'request.course.id'}) { return ''; }
my $answer=reply(
"restore:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb",
"$ENV{'user.home'}");
my %returnhash=();
map {
my ($name,$value)=split(/\=/,$_);
$returnhash{&unescape($name)}=&unescape($value);
} split(/\&/,$answer);
my $version;
for ($version=1;$version<=$returnhash{'version'};$version++) {
map {
$returnhash{$_}=$returnhash{$version.':'.$_};
} split(/\:/,$returnhash{$version.':keys'});
}
return %returnhash;
}
# ---------------------------------------------------------- Course Description
sub coursedescription {
my $courseid=shift;
$courseid=~s/^\///;
$courseid=~s/\_/\//g;
my ($cdomain,$cnum)=split(/\//,$courseid);
my $chome=homeserver($cnum,$cdomain);
if ($chome ne 'no_host') {
my $rep=reply("dump:$cdomain:$cnum:environment",$chome);
if ($rep ne 'con_lost') {
my $normalid=$courseid;
$normalid=~s/\//\_/g;
my %envhash=();
my %returnhash=('home' => $chome,
'domain' => $cdomain,
'num' => $cnum);
map {
my ($name,$value)=split(/\=/,$_);
$name=&unescape($name);
$value=&unescape($value);
$returnhash{$name}=$value;
$envhash{'course.'.$normalid.'.'.$name}=$value;
} split(/\&/,$rep);
$returnhash{'url'}='/res/'.declutter($returnhash{'url'});
$returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
$ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
$envhash{'course.'.$normalid.'.last_cache'}=time;
$envhash{'course.'.$normalid.'.home'}=$chome;
$envhash{'course.'.$normalid.'.domain'}=$cdomain;
$envhash{'course.'.$normalid.'.num'}=$cnum;
&appenv(%envhash);
return %returnhash;
}
}
return ();
}
# -------------------------------------------------------- Get user priviledges
sub rolesinit {
my ($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 '') {
map {
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{$trole.':c'};
}
}
}
}
}
} split(/&/,$rolesdump);
map {
%thesepriv=();
map {
if ($_ ne '') {
my ($priviledge,$restrictions)=split(/&/,$_);
if ($restrictions eq '') {
$thesepriv{$priviledge}='F';
} else {
if ($thesepriv{$priviledge} ne 'F') {
$thesepriv{$priviledge}.=$restrictions;
}
}
}
} split(/:/,$allroles{$_});
$thesestr='';
map { $thesestr.=':'.$_.'&'.$thesepriv{$_}; } keys %thesepriv;
$userroles.='user.priv.'.$_.'='.$thesestr."\n";
} keys %allroles;
}
return $userroles;
}
# --------------------------------------------------------------- get interface
sub get {
my ($namespace,@storearr)=@_;
my $items='';
map {
$items.=escape($_).'&';
} @storearr;
$items=~s/\&$//;
my $rep=reply("get:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
$ENV{'user.home'});
my @pairs=split(/\&/,$rep);
my %returnhash=();
my $i=0;
map {
$returnhash{$_}=unescape($pairs[$i]);
$i++;
} @storearr;
return %returnhash;
}
# --------------------------------------------------------------- del interface
sub del {
my ($namespace,@storearr)=@_;
my $items='';
map {
$items.=escape($_).'&';
} @storearr;
$items=~s/\&$//;
return reply("del:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
$ENV{'user.home'});
}
# -------------------------------------------------------------- dump interface
sub dump {
my $namespace=shift;
my $rep=reply("dump:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace",
$ENV{'user.home'});
my @pairs=split(/\&/,$rep);
my %returnhash=();
map {
my ($key,$value)=split(/=/,$_);
$returnhash{unescape($key)}=unescape($value);
} @pairs;
return %returnhash;
}
# --------------------------------------------------------------- put interface
sub put {
my ($namespace,%storehash)=@_;
my $items='';
map {
$items.=escape($_).'='.escape($storehash{$_}).'&';
} keys %storehash;
$items=~s/\&$//;
return reply("put:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
$ENV{'user.home'});
}
# ------------------------------------------------------ critical put interface
sub cput {
my ($namespace,%storehash)=@_;
my $items='';
map {
$items.=escape($_).'='.escape($storehash{$_}).'&';
} keys %storehash;
$items=~s/\&$//;
return critical
("put:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
$ENV{'user.home'});
}
# -------------------------------------------------------------- eget interface
sub eget {
my ($namespace,@storearr)=@_;
my $items='';
map {
$items.=escape($_).'&';
} @storearr;
$items=~s/\&$//;
my $rep=reply("eget:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
$ENV{'user.home'});
my @pairs=split(/\&/,$rep);
my %returnhash=();
my $i=0;
map {
$returnhash{$_}=unescape($pairs[$i]);
$i++;
} @storearr;
return %returnhash;
}
# ------------------------------------------------- Check for a user priviledge
sub allowed {
my ($priv,$uri)=@_;
$uri=&declutter($uri);
# Free bre access to adm and meta resources
if ((($uri=~/^adm\//) || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {
return 'F';
}
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)/\/$1/;
if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseuri}
=~/$priv\&([^\:]*)/) {
$thisallowed.=$1;
}
# Full access at system, domain or course-wide level? Exit.
if ($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:'=~/\:$priv\:/) {
return $thisallowed;
}
#
# Gathered so far: system, domain and course wide priviledges
#
# Course: See if uri or referer is an individual resource that is part of
# the course
if ($ENV{'request.course.id'}) {
$courseprivid=$ENV{'request.course.id'};
if ($ENV{'request.course.sec'}) {
$courseprivid.='/'.$ENV{'request.course.sec'};
}
$courseprivid=~s/\_/\//;
my $checkreferer=1;
my @uriparts=split(/\//,$uri);
my $filename=$uriparts[$#uriparts];
my $pathname=$uri;
$pathname=~s/\/$filename$//;
if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
/\&$filename\:([\d\|]+)\&/) {
$statecond=$1;
if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
=~/$priv\&([^\:]*)/) {
$thisallowed.=$1;
$checkreferer=0;
}
}
if (($ENV{'HTTP_REFERER'}) && ($checkreferer)) {
my $refuri=$ENV{'HTTP_REFERER'};
$refuri=~s/^http\:\/\/$ENV{'request.host'}//i;
$refuri=&declutter($refuri);
my @uriparts=split(/\//,$refuri);
my $filename=$uriparts[$#uriparts];
my $pathname=$refuri;
$pathname=~s/\/$filename$//;
my @filenameparts=split(/\./,$uri);
if (&fileembstyle($filenameparts[$#filenameparts]) ne 'ssi') {
if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
/\&$filename\:([\d\|]+)\&/) {
my $refstatecond=$1;
if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
=~/$priv\&([^\:]*)/) {
$thisallowed.=$1;
$uri=$refuri;
$statecond=$refstatecond;
}
}
}
}
}
#
# Gathered now: all priviledges 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;
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'},
$ENV{'user.host'},
'Locked by res: '.$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'},
$ENV{'user.host'},
'Locked by priv: '.$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];
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 '.
$ENV{'request.course.id'});
return '';
}
}
# Resource preferences
if ($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=<$fh>;
}
if (join('',@content)=~
/\<roledeny[^\>]*\>[^\<]*$rolecode[^\<]*\<\/roledeny\>/) {
&log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);
return '';
}
}
}
# Restricted by state?
if ($thisallowed=~/X/) {
if (&condval($statecond)) {
return '2';
} else {
return '';
}
}
return 'F';
}
# ----------------------------------------------------------------- Define Role
sub definerole {
if (allowed('mcr','/')) {
my ($rolename,$sysrole,$domrole,$courole)=@_;
map {
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&$cqual";
}
}
} split('/',$sysrole);
map {
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&$cqual";
}
}
} split('/',$domrole);
map {
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&$cqual";
}
}
} split('/',$courole);
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';
}
}
# ------------------------------------------------------------------ Plain Text
sub plaintext {
my $short=shift;
return $prp{$short};
}
# ------------------------------------------------------------------ Plain Text
sub fileembstyle {
my $ending=shift;
return $fe{$ending};
}
# ------------------------------------------------------------ Description Text
sub filedescription {
my $ending=shift;
return $fd{$ending};
}
# ----------------------------------------------------------------- Assign Role
sub assignrole {
my ($udom,$uname,$url,$role,$end,$start)=@_;
my $mrole;
$url=declutter($url);
if ($role =~ /^cr\//) {
unless ($url=~/\.course$/) { return 'invalid'; }
unless (allowed('ccr',$url)) { return 'refused'; }
$mrole='cr';
} else {
unless (($url=~/\.course$/) || ($url=~/\/$/)) { return 'invalid'; }
unless (allowed('c'+$role)) { 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,$udom));
}
# ---------------------------------------------------------- Assign Custom Role
sub assigncustomrole {
my ($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=shift;
$uri=~s/^\///;
$uri=~s/\/$//;
my ($res,$udom,$uname,@rest)=split(/\//,$uri);
if ($udom) {
if ($uname) {
my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/'.$uri,
homeserver($uname,$udom));
return split(/:/,$listing);
} else {
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')) {
map {
my ($entry,@stat)=split(/&/,$_);
$allusers{$entry}=1;
} split(/:/,$listing);
}
}
}
my $alluserstr='';
map {
$alluserstr.=$_.'&user:';
} sort keys %allusers;
$alluserstr=~s/:$//;
return split(/:/,$alluserstr);
}
} else {
my $tryserver;
my %alldom=();
foreach $tryserver (keys %libserv) {
$alldom{$hostdom{$tryserver}}=1;
}
my $alldomstr='';
map {
$alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
} sort keys %alldom;
$alldomstr=~s/:$//;
return split(/:/,$alldomstr);
}
}
# -------------------------------------------------------- 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 $allpathcond='';
map {
if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_})) {
$allpathcond.=
'('.$ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_}.')|';
}
} split(/\|/,$condidx);
$allpathcond=~s/\|$//;
if ($ENV{'request.course.id'}) {
if ($allpathcond) {
my $operand='|';
my @stack;
map {
if ($_ 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:$new;
}
}
} ($allpathcond=~/(\d+|\(|\)|\&|\|)/g);
}
}
return $result;
}
# --------------------------------------------------------- Value of a Variable
sub EXT {
my $varname=shift;
unless ($varname) { return ''; }
my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
my $rest;
if ($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') {
my %restored=&restore;
return $restored{$qualifierrest};
# ----------------------------------------------------------------- user.access
} elsif ($space eq 'access') {
return &allowed($qualifier,$rest);
# ------------------------------------------ user.preferences, user.environment
} elsif (($space eq 'preferences') || ($space eq 'environment')) {
return $ENV{join('.',('environment',$qualifierrest))};
# ----------------------------------------------------------------- user.course
} elsif ($space eq 'course') {
return $ENV{join('.',('request.course',$qualifier))};
# ------------------------------------------------------------------- user.role
} elsif ($space eq 'role') {
my ($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 $ENV{'user.domain'};
# ------------------------------------------------------------------- user.name
} elsif ($space eq 'name') {
return $ENV{'user.name'};
# ---------------------------------------------------- Any other user namespace
} else {
my $item=($rest)?$qualifier.'.'.$rest:$qualifier;
my %reply=&get($space,$item);
return $reply{$item};
}
} 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
my $section='';
if ($ENV{'request.course.sec'}) {
$section='_'.$ENV{'request.course.sec'};
}
return $ENV{'course.'.$ENV{'request.course.id'}.$section.'.'.
$spacequalifierrest};
} elsif ($realm eq 'resource') {
if ($ENV{'request.course.id'}) {
# ----------------------------------------------------- Cascading lookup scheme
my $symbp=&symbread();
my $mapp=(split(/\_\_\_/,$symbp))[0];
my $symbparm=$symbp.'.'.$spacequalifierrest;
my $mapparm=$mapp.'___(all).'.$spacequalifierrest;
my $seclevel=
$ENV{'request.course.id'}.'.['.
$ENV{'request.course.sec'}.'].'.$spacequalifierrest;
my $seclevelr=
$ENV{'request.course.id'}.'.['.
$ENV{'request.course.sec'}.'].'.$symbparm;
my $seclevelm=
$ENV{'request.course.id'}.'.['.
$ENV{'request.course.sec'}.'].'.$mapparm;
my $courselevel=
$ENV{'request.course.id'}.'.'.$spacequalifierrest;
my $courselevelr=
$ENV{'request.course.id'}.'.'.$symbparm;
my $courselevelm=
$ENV{'request.course.id'}.'.'.$mapparm;
# ----------------------------------------------------------- first, check user
my %resourcedata=get('resourcedata',
($courselevelr,$courselevelm,$courselevel));
if ($resourcedata{$courselevelr}!~/^error\:/) {
if ($resourcedata{$courselevelr}) {
return $resourcedata{$courselevelr}; }
if ($resourcedata{$courselevelm}) {
return $resourcedata{$courselevelm}; }
if ($resourcedata{$courselevel}) { return $resourcedata{$courselevel}; }
}
# -------------------------------------------------------- second, check course
my $section='';
if ($ENV{'request.course.sec'}) {
$section='_'.$ENV{'request.course.sec'};
}
my $reply=&reply('get:'.
$ENV{'course.'.$ENV{'request.course.id'}.$section.'.domain'}.':'.
$ENV{'course.'.$ENV{'request.course.id'}.$section.'.num'}.
':resourcedata:'.
escape($seclevelr).':'.escape($seclevelm).':'.escape($seclevel).':'.
escape($courselevelr).':'.escape($courselevelm).':'.escape($courselevel),
$ENV{'course.'.$ENV{'request.course.id'}.$section.'.home'});
if ($reply!~/^error\:/) {
map {
my ($name,$value)=split(/\=/,$_);
$resourcedata{unescape($name)}=unescape($value);
} split(/\&/,$reply);
if ($resourcedata{$seclevelr}) { return $resourcedata{$seclevelr}; }
if ($resourcedata{$seclevelm}) { return $resourcedata{$seclevelm}; }
if ($resourcedata{$seclevel}) { return $resourcedata{$seclevel}; }
if ($resourcedata{$courselevelr}) {
return $resourcedata{$courselevelr}; }
if ($resourcedata{$courselevelm}) {
return $resourcedata{$courselevelm}; }
if ($resourcedata{$courselevel}) { return $resourcedata{$courselevel}; }
}
# ------------------------------------------------------ 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 $metadata=&metadata($ENV{'request.filename'},$spacequalifierrest);
if ($metadata) { return $metadata; }
$metadata=&metadata($ENV{'request.filename'},
'parameter_'.$spacequalifierrest);
if ($metadata) { return $metadata; }
# ---------------------------------------------------- Any other user namespace
} elsif ($realm eq 'environment') {
# ----------------------------------------------------------------- environment
return $ENV{$spacequalifierrest};
} elsif ($realm eq 'system') {
# ----------------------------------------------------------------- system.time
if ($space eq 'time') {
return time;
}
}
return '';
}
# ---------------------------------------------------------------- Get metadata
sub metadata {
my ($uri,$what)=@_;
$uri=&declutter($uri);
my $filename=$uri;
$uri=~s/\.meta$//;
unless ($metacache{$uri.':keys'}) {
unless ($filename=~/\.meta$/) { $filename.='.meta'; }
my $metastring=&getfile($perlvar{'lonDocRoot'}.'/res/'.$filename);
my $parser=HTML::TokeParser->new(\$metastring);
my $token;
while ($token=$parser->get_token) {
if ($token->[0] eq 'S') {
my $entry=$token->[1];
my $unikey=$entry;
if (defined($token->[2]->{'part'})) {
$unikey.='_'.$token->[2]->{'part'};
}
if (defined($token->[2]->{'name'})) {
$unikey.='_'.$token->[2]->{'name'};
}
if ($metacache{$uri.':keys'}) {
$metacache{$uri.':keys'}.=','.$unikey;
} else {
$metacache{$uri.':keys'}=$unikey;
}
map {
$metacache{$uri.':'.$unikey.'.'.$_}=$token->[2]->{$_};
} @{$token->[3]};
unless (
$metacache{$uri.':'.$unikey}=$parser->get_text('/'.$entry)
) { $metacache{$uri.':'.$unikey}=
$metacache{$uri.':'.$unikey.'.default'};
}
}
}
}
return $metacache{$uri.':'.$what};
}
# ------------------------------------------------- Update symbolic store links
sub symblist {
my ($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)) {
map {
$hash{declutter($_)}=$mapname.'___'.$newhash{$_};
} keys %newhash;
if (untie(%hash)) {
return 'ok';
}
}
}
return 'error';
}
# ------------------------------------------------------ Return symb list entry
sub symbread {
my $thisfn=shift;
unless ($thisfn) {
$thisfn=$ENV{'request.filename'};
}
$thisfn=declutter($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_/res/'.$thisfn};
unless ($ids) {
$ids=$bighash{'ids_/'.$thisfn};
}
if ($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;
} else {
# ------------------------------------------ There is more than one possibility
my $realpossible=0;
map {
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;
}
}
} @possibilities;
if ($realpossible!=1) { $syval=''; }
}
}
untie(%bighash)
}
}
if ($syval) {
return $syval.'___'.$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 $symb;
unless ($symb=&symbread()) { return time; }
my $symbchck=unpack("%32C*",$symb);
my $symbseed=numval($symb)%$symbchck;
my $namechck=unpack("%32C*",$ENV{'user.name'});
my $nameseed=numval($ENV{'user.name'})%$namechck;
return int( $symbseed
.$nameseed
.unpack("%32C*",$ENV{'user.domain'})
.unpack("%32C*",$ENV{'request.course.id'})
.$namechck
.$symbchck);
}
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 {
return &ireceipt($ENV{'user.name'},$ENV{'user.domain'},
$ENV{'request.course.id'},&symbread());
}
# ------------------------------------------------------------ Serves up a file
# returns either the contents of the file or a -1
sub getfile {
my $file=shift;
&repcopy($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:;
} 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,$file)=@_;
unless (($_=~/^http:\/\//i) || ($_=~/^\//)) {
my $finalpath=filelocation($dir,$file);
$finalpath=~s/^\/home\/httpd\/html//;
return $finalpath;
} else {
return $file;
}
}
# ------------------------------------------------------------- Declutters URLs
sub declutter {
my $thisfn=shift;
$thisfn=~s/^$perlvar{'lonDocRoot'}//;
$thisfn=~s/^\///;
$thisfn=~s/^res\///;
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 $str;
}
# ================================================================ Main Program
sub BEGIN {
if ($readit ne 'done') {
# ------------------------------------------------------------ Read access.conf
{
my $config=Apache::File->new("/etc/httpd/conf/access.conf");
while (my $configline=<$config>) {
if ($configline =~ /PerlSetVar/) {
my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
chomp($varvalue);
$perlvar{$varname}=$varvalue;
}
}
}
# ------------------------------------------------------------- Read hosts file
{
my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
while (my $configline=<$config>) {
my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
$hostname{$id}=$name;
$hostdom{$id}=$domain;
if ($role eq 'library') { $libserv{$id}=$name; }
}
}
# ------------------------------------------------------ Read spare server file
{
my $config=Apache::File->new("$perlvar{'lonTabDir'}/spare.tab");
while (my $configline=<$config>) {
chomp($configline);
if (($configline) && ($configline ne $perlvar{'lonHostID'})) {
$spareid{$configline}=1;
}
}
}
# ------------------------------------------------------------ Read permissions
{
my $config=Apache::File->new("$perlvar{'lonTabDir'}/roles.tab");
while (my $configline=<$config>) {
chomp($configline);
my ($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($configline);
my ($short,$plain)=split(/:/,$configline);
if ($plain ne '') { $prp{$short}=$plain; }
}
}
# ------------------------------------------------------------- Read file types
{
my $config=Apache::File->new("$perlvar{'lonTabDir'}/filetypes.tab");
while (my $configline=<$config>) {
chomp($configline);
my ($ending,$emb,@descr)=split(/\s+/,$configline);
if ($descr[0] ne '') {
$fe{$ending}=$emb;
$fd{$ending}=join(' ',@descr);
}
}
}
%metacache=();
$readit='done';
&logthis('<font color=yellow>INFO: Read configuration</font>');
}
}
1;
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