1: # The LearningOnline Network
2: # TCP networking package
3: #
4: # $Id: lonnet.pm,v 1.401 2003/08/14 22:23:53 bowersj2 Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # 6/1/99,6/2,6/10,6/11,6/12,6/14,6/26,6/28,6/29,6/30,
29: # 7/1,7/2,7/9,7/10,7/12,7/14,7/15,7/19,
30: # 11/8,11/16,11/18,11/22,11/23,12/22,
31: # 01/06,01/13,02/24,02/28,02/29,
32: # 03/01,03/02,03/06,03/07,03/13,
33: # 04/05,05/29,05/31,06/01,
34: # 06/05,06/26 Gerd Kortemeyer
35: # 06/26 Ben Tyszka
36: # 06/30,07/15,07/17,07/18,07/20,07/21,07/22,07/25 Gerd Kortemeyer
37: # 08/14 Ben Tyszka
38: # 08/22,08/28,08/31,09/01,09/02,09/04,09/05,09/25,09/28,09/30 Gerd Kortemeyer
39: # 10/04 Gerd Kortemeyer
40: # 10/04 Guy Albertelli
41: # 10/06,10/09,10/10,10/11,10/14,10/20,10/23,10/25,10/26,10/27,10/28,10/29,
42: # 10/30,10/31,
43: # 11/2,11/14,11/15,11/16,11/20,11/21,11/22,11/25,11/27,
44: # 12/02,12/12,12/13,12/14,12/28,12/29 Gerd Kortemeyer
45: # 05/01/01 Guy Albertelli
46: # 05/01,06/01,09/01 Gerd Kortemeyer
47: # 09/01 Guy Albertelli
48: # 09/01,10/01,11/01 Gerd Kortemeyer
49: # YEAR=2001
50: # 3/2 Gerd Kortemeyer
51: # 3/19,3/20 Gerd Kortemeyer
52: # 5/26,5/28 Gerd Kortemeyer
53: # 5/30 H. K. Ng
54: # 6/1 Gerd Kortemeyer
55: # July Guy Albertelli
56: # 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,
57: # 10/2 Gerd Kortemeyer
58: # 11/17,11/20,11/22,11/29 Gerd Kortemeyer
59: # 12/5 Matthew Hall
60: # 12/5 Guy Albertelli
61: # 12/6,12/7,12/12 Gerd Kortemeyer
62: # 12/21,12/22,12/27,12/28 Gerd Kortemeyer
63: # YEAR=2002
64: # 1/4,2/4,2/7 Gerd Kortemeyer
65: #
66: ###
67:
68: package Apache::lonnet;
69:
70: use strict;
71: use Apache::File;
72: use LWP::UserAgent();
73: use HTTP::Headers;
74: use vars
75: qw(%perlvar %hostname %homecache %badServerCache %hostip %iphost %spareid %hostdom
76: %libserv %pr %prp %metacache %packagetab %titlecache
77: %courselogs %accesshash %userrolehash $processmarker $dumpcount
78: %coursedombuf %coursenumbuf %coursehombuf %coursedescrbuf %courseresdatacache
79: %domaindescription %domain_auth_def %domain_auth_arg_def $tmpdir);
80: use IO::Socket;
81: use GDBM_File;
82: use Apache::Constants qw(:common :http);
83: use HTML::LCParser;
84: use Fcntl qw(:flock);
85: use Apache::loncoursedata;
86:
87: my $readit;
88:
89: # --------------------------------------------------------------------- Logging
90:
91: sub logtouch {
92: my $execdir=$perlvar{'lonDaemons'};
93: unless (-e "$execdir/logs/lonnet.log") {
94: my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
95: close $fh;
96: }
97: my ($wwwuid,$wwwgid)=(getpwnam('www'))[2,3];
98: chown($wwwuid,$wwwgid,$execdir.'/logs/lonnet.log');
99: }
100:
101: sub logthis {
102: my $message=shift;
103: my $execdir=$perlvar{'lonDaemons'};
104: my $now=time;
105: my $local=localtime($now);
106: my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
107: print $fh "$local ($$): $message\n";
108: return 1;
109: }
110:
111: sub logperm {
112: my $message=shift;
113: my $execdir=$perlvar{'lonDaemons'};
114: my $now=time;
115: my $local=localtime($now);
116: my $fh=Apache::File->new(">>$execdir/logs/lonnet.perm.log");
117: print $fh "$now:$message:$local\n";
118: return 1;
119: }
120:
121: # -------------------------------------------------- Non-critical communication
122: sub subreply {
123: my ($cmd,$server)=@_;
124: my $peerfile="$perlvar{'lonSockDir'}/$server";
125: my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
126: Type => SOCK_STREAM,
127: Timeout => 10)
128: or return "con_lost";
129: print $client "$cmd\n";
130: my $answer=<$client>;
131: if (!$answer) { $answer="con_lost"; }
132: chomp($answer);
133: return $answer;
134: }
135:
136: sub reply {
137: my ($cmd,$server)=@_;
138: unless (defined($hostname{$server})) { return 'no_such_host'; }
139: my $answer=subreply($cmd,$server);
140: if ($answer eq 'con_lost') {
141: #sleep 5;
142: #$answer=subreply($cmd,$server);
143: #if ($answer eq 'con_lost') {
144: # &logthis("Second attempt con_lost on $server");
145: # my $peerfile="$perlvar{'lonSockDir'}/$server";
146: # my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
147: # Type => SOCK_STREAM,
148: # Timeout => 10)
149: # or return "con_lost";
150: # &logthis("Killing socket");
151: # print $client "close_connection_exit\n";
152: #sleep 5;
153: # $answer=subreply($cmd,$server);
154: #}
155: }
156: if (($answer=~/^refused/) || ($answer=~/^rejected/)) {
157: &logthis("<font color=blue>WARNING:".
158: " $cmd to $server returned $answer</font>");
159: }
160: return $answer;
161: }
162:
163: # ----------------------------------------------------------- Send USR1 to lonc
164:
165: sub reconlonc {
166: my $peerfile=shift;
167: &logthis("Trying to reconnect for $peerfile");
168: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
169: if (my $fh=Apache::File->new("$loncfile")) {
170: my $loncpid=<$fh>;
171: chomp($loncpid);
172: if (kill 0 => $loncpid) {
173: &logthis("lonc at pid $loncpid responding, sending USR1");
174: kill USR1 => $loncpid;
175: sleep 1;
176: if (-e "$peerfile") { return; }
177: &logthis("$peerfile still not there, give it another try");
178: sleep 5;
179: if (-e "$peerfile") { return; }
180: &logthis(
181: "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
182: } else {
183: &logthis(
184: "<font color=blue>WARNING:".
185: " lonc at pid $loncpid not responding, giving up</font>");
186: }
187: } else {
188: &logthis('<font color=blue>WARNING: lonc not running, giving up</font>');
189: }
190: }
191:
192: # ------------------------------------------------------ Critical communication
193:
194: sub critical {
195: my ($cmd,$server)=@_;
196: unless ($hostname{$server}) {
197: &logthis("<font color=blue>WARNING:".
198: " Critical message to unknown server ($server)</font>");
199: return 'no_such_host';
200: }
201: my $answer=reply($cmd,$server);
202: if ($answer eq 'con_lost') {
203: my $pingreply=reply('ping',$server);
204: &reconlonc("$perlvar{'lonSockDir'}/$server");
205: my $pongreply=reply('pong',$server);
206: &logthis("Ping/Pong for $server: $pingreply/$pongreply");
207: $answer=reply($cmd,$server);
208: if ($answer eq 'con_lost') {
209: my $now=time;
210: my $middlename=$cmd;
211: $middlename=substr($middlename,0,16);
212: $middlename=~s/\W//g;
213: my $dfilename=
214: "$perlvar{'lonSockDir'}/delayed/$now.$dumpcount.$$.$middlename.$server";
215: $dumpcount++;
216: {
217: my $dfh;
218: if ($dfh=Apache::File->new(">$dfilename")) {
219: print $dfh "$cmd\n";
220: }
221: }
222: sleep 2;
223: my $wcmd='';
224: {
225: my $dfh;
226: if ($dfh=Apache::File->new("$dfilename")) {
227: $wcmd=<$dfh>;
228: }
229: }
230: chomp($wcmd);
231: if ($wcmd eq $cmd) {
232: &logthis("<font color=blue>WARNING: ".
233: "Connection buffer $dfilename: $cmd</font>");
234: &logperm("D:$server:$cmd");
235: return 'con_delayed';
236: } else {
237: &logthis("<font color=red>CRITICAL:"
238: ." Critical connection failed: $server $cmd</font>");
239: &logperm("F:$server:$cmd");
240: return 'con_failed';
241: }
242: }
243: }
244: return $answer;
245: }
246:
247: # ------------------------------------------- Transfer profile into environment
248:
249: sub transfer_profile_to_env {
250: my ($lonidsdir,$handle)=@_;
251: my @profile;
252: {
253: my $idf=Apache::File->new("$lonidsdir/$handle.id");
254: flock($idf,LOCK_SH);
255: @profile=<$idf>;
256: $idf->close();
257: }
258: my $envi;
259: for ($envi=0;$envi<=$#profile;$envi++) {
260: chomp($profile[$envi]);
261: my ($envname,$envvalue)=split(/=/,$profile[$envi]);
262: $ENV{$envname} = $envvalue;
263: }
264: $ENV{'user.environment'} = "$lonidsdir/$handle.id";
265: }
266:
267: # ---------------------------------------------------------- Append Environment
268:
269: sub appenv {
270: my %newenv=@_;
271: foreach (keys %newenv) {
272: if (($newenv{$_}=~/^user\.role/) || ($newenv{$_}=~/^user\.priv/)) {
273: &logthis("<font color=blue>WARNING: ".
274: "Attempt to modify environment ".$_." to ".$newenv{$_}
275: .'</font>');
276: delete($newenv{$_});
277: } else {
278: $ENV{$_}=$newenv{$_};
279: }
280: }
281:
282: my $lockfh;
283: unless ($lockfh=Apache::File->new("$ENV{'user.environment'}")) {
284: return 'error: '.$!;
285: }
286: unless (flock($lockfh,LOCK_EX)) {
287: &logthis("<font color=blue>WARNING: ".
288: 'Could not obtain exclusive lock in appenv: '.$!);
289: $lockfh->close();
290: return 'error: '.$!;
291: }
292:
293: my @oldenv;
294: {
295: my $fh;
296: unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
297: return 'error: '.$!;
298: }
299: @oldenv=<$fh>;
300: $fh->close();
301: }
302: for (my $i=0; $i<=$#oldenv; $i++) {
303: chomp($oldenv[$i]);
304: if ($oldenv[$i] ne '') {
305: my ($name,$value)=split(/=/,$oldenv[$i]);
306: unless (defined($newenv{$name})) {
307: $newenv{$name}=$value;
308: }
309: }
310: }
311: {
312: my $fh;
313: unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
314: return 'error';
315: }
316: my $newname;
317: foreach $newname (keys %newenv) {
318: print $fh "$newname=$newenv{$newname}\n";
319: }
320: $fh->close();
321: }
322:
323: $lockfh->close();
324: return 'ok';
325: }
326: # ----------------------------------------------------- Delete from Environment
327:
328: sub delenv {
329: my $delthis=shift;
330: my %newenv=();
331: if (($delthis=~/user\.role/) || ($delthis=~/user\.priv/)) {
332: &logthis("<font color=blue>WARNING: ".
333: "Attempt to delete from environment ".$delthis);
334: return 'error';
335: }
336: my @oldenv;
337: {
338: my $fh;
339: unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
340: return 'error';
341: }
342: unless (flock($fh,LOCK_SH)) {
343: &logthis("<font color=blue>WARNING: ".
344: 'Could not obtain shared lock in delenv: '.$!);
345: $fh->close();
346: return 'error: '.$!;
347: }
348: @oldenv=<$fh>;
349: $fh->close();
350: }
351: {
352: my $fh;
353: unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
354: return 'error';
355: }
356: unless (flock($fh,LOCK_EX)) {
357: &logthis("<font color=blue>WARNING: ".
358: 'Could not obtain exclusive lock in delenv: '.$!);
359: $fh->close();
360: return 'error: '.$!;
361: }
362: foreach (@oldenv) {
363: unless ($_=~/^$delthis/) { print $fh $_; }
364: }
365: $fh->close();
366: }
367: return 'ok';
368: }
369:
370: # ------------------------------------------ Find out current server userload
371: # there is a copy in lond
372: sub userload {
373: my $numusers=0;
374: {
375: opendir(LONIDS,$perlvar{'lonIDsDir'});
376: my $filename;
377: my $curtime=time;
378: while ($filename=readdir(LONIDS)) {
379: if ($filename eq '.' || $filename eq '..') {next;}
380: my ($atime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[8];
381: if ($curtime-$atime < 3600) { $numusers++; }
382: }
383: closedir(LONIDS);
384: }
385: my $userloadpercent=0;
386: my $maxuserload=$perlvar{'lonUserLoadLim'};
387: if ($maxuserload) {
388: $userloadpercent=100*$numusers/$maxuserload;
389: }
390: $userloadpercent=sprintf("%.2f",$userloadpercent);
391: return $userloadpercent;
392: }
393:
394: # ------------------------------------------ Fight off request when overloaded
395:
396: sub overloaderror {
397: my ($r,$checkserver)=@_;
398: unless ($checkserver) { $checkserver=$perlvar{'lonHostID'}; }
399: my $loadavg;
400: if ($checkserver eq $perlvar{'lonHostID'}) {
401: my $loadfile=Apache::File->new('/proc/loadavg');
402: $loadavg=<$loadfile>;
403: $loadavg =~ s/\s.*//g;
404: $loadavg = 100*$loadavg/$perlvar{'lonLoadLim'};
405: } else {
406: $loadavg=&reply('load',$checkserver);
407: }
408: my $overload=$loadavg-100;
409: if ($overload>0) {
410: $r->err_headers_out->{'Retry-After'}=$overload;
411: $r->log_error('Overload of '.$overload.' on '.$checkserver);
412: return 413;
413: }
414: return '';
415: }
416:
417: # ------------------------------ Find server with least workload from spare.tab
418:
419: sub spareserver {
420: my ($loadpercent,$userloadpercent) = @_;
421: my $tryserver;
422: my $spareserver='';
423: if ($userloadpercent !~ /\d/) { $userloadpercent=0; }
424: my $lowestserver=$loadpercent > $userloadpercent?
425: $loadpercent : $userloadpercent;
426: foreach $tryserver (keys %spareid) {
427: my $loadans=reply('load',$tryserver);
428: my $userloadans=reply('userload',$tryserver);
429: if ($userloadans !~ /\d/) { $userloadans=0; }
430: my $answer=$loadans > $userloadans?
431: $loadans : $userloadans;
432: if (($answer =~ /\d/) && ($answer<$lowestserver)) {
433: $spareserver="http://$hostname{$tryserver}";
434: $lowestserver=$answer;
435: }
436: }
437: return $spareserver;
438: }
439:
440: # --------------------------------------------- Try to change a user's password
441:
442: sub changepass {
443: my ($uname,$udom,$currentpass,$newpass,$server)=@_;
444: $currentpass = &escape($currentpass);
445: $newpass = &escape($newpass);
446: my $answer = reply("encrypt:passwd:$udom:$uname:$currentpass:$newpass",
447: $server);
448: if (! $answer) {
449: &logthis("No reply on password change request to $server ".
450: "by $uname in domain $udom.");
451: } elsif ($answer =~ "^ok") {
452: &logthis("$uname in $udom successfully changed their password ".
453: "on $server.");
454: } elsif ($answer =~ "^pwchange_failure") {
455: &logthis("$uname in $udom was unable to change their password ".
456: "on $server. The action was blocked by either lcpasswd ".
457: "or pwchange");
458: } elsif ($answer =~ "^non_authorized") {
459: &logthis("$uname in $udom did not get their password correct when ".
460: "attempting to change it on $server.");
461: } elsif ($answer =~ "^auth_mode_error") {
462: &logthis("$uname in $udom attempted to change their password despite ".
463: "not being locally or internally authenticated on $server.");
464: } elsif ($answer =~ "^unknown_user") {
465: &logthis("$uname in $udom attempted to change their password ".
466: "on $server but were unable to because $server is not ".
467: "their home server.");
468: } elsif ($answer =~ "^refused") {
469: &logthis("$server refused to change $uname in $udom password because ".
470: "it was sent an unencrypted request to change the password.");
471: }
472: return $answer;
473: }
474:
475: # ----------------------- Try to determine user's current authentication scheme
476:
477: sub queryauthenticate {
478: my ($uname,$udom)=@_;
479: if (($perlvar{'lonRole'} eq 'library') &&
480: ($udom eq $perlvar{'lonDefDomain'})) {
481: my $answer=reply("encrypt:currentauth:$udom:$uname",
482: $perlvar{'lonHostID'});
483: unless ($answer eq 'unknown_user' or $answer eq 'refused') {
484: if (length($answer)) {
485: return $answer;
486: }
487: else {
488: &logthis("User $uname at $udom lacks an authentication mechanism");
489: return 'no_host';
490: }
491: }
492: }
493:
494: my $tryserver;
495: foreach $tryserver (keys %libserv) {
496: if ($hostdom{$tryserver} eq $udom) {
497: my $answer=reply("encrypt:currentauth:$udom:$uname",$tryserver);
498: unless ($answer eq 'unknown_user' or $answer eq 'refused') {
499: if (length($answer)) {
500: return $answer;
501: }
502: else {
503: &logthis("User $uname at $udom lacks an authentication mechanism");
504: return 'no_host';
505: }
506: }
507: }
508: }
509: &logthis("User $uname at $udom lacks an authentication mechanism");
510: return 'no_host';
511: }
512:
513: # --------- Try to authenticate user from domain's lib servers (first this one)
514:
515: sub authenticate {
516: my ($uname,$upass,$udom)=@_;
517: $upass=escape($upass);
518: $uname=~s/\W//g;
519: if (($perlvar{'lonRole'} eq 'library') &&
520: ($udom eq $perlvar{'lonDefDomain'})) {
521: my $answer=reply("encrypt:auth:$udom:$uname:$upass",$perlvar{'lonHostID'});
522: if ($answer =~ /authorized/) {
523: if ($answer eq 'authorized') {
524: &logthis("User $uname at $udom authorized by local server");
525: return $perlvar{'lonHostID'};
526: }
527: if ($answer eq 'non_authorized') {
528: &logthis("User $uname at $udom rejected by local server");
529: return 'no_host';
530: }
531: }
532: }
533:
534: my $tryserver;
535: foreach $tryserver (keys %libserv) {
536: if ($hostdom{$tryserver} eq $udom) {
537: my $answer=reply("encrypt:auth:$udom:$uname:$upass",$tryserver);
538: if ($answer =~ /authorized/) {
539: if ($answer eq 'authorized') {
540: &logthis("User $uname at $udom authorized by $tryserver");
541: return $tryserver;
542: }
543: if ($answer eq 'non_authorized') {
544: &logthis("User $uname at $udom rejected by $tryserver");
545: return 'no_host';
546: }
547: }
548: }
549: }
550: &logthis("User $uname at $udom could not be authenticated");
551: return 'no_host';
552: }
553:
554: # ---------------------- Find the homebase for a user from domain's lib servers
555:
556: sub homeserver {
557: my ($uname,$udom,$ignoreBadCache)=@_;
558: my $index="$uname:$udom";
559: if ($homecache{$index}) {
560: return "$homecache{$index}";
561: }
562: my $tryserver;
563: foreach $tryserver (keys %libserv) {
564: next if ($ignoreBadCache ne 'true' &&
565: exists($badServerCache{$tryserver}));
566: if ($hostdom{$tryserver} eq $udom) {
567: my $answer=reply("home:$udom:$uname",$tryserver);
568: if ($answer eq 'found') {
569: $homecache{$index}=$tryserver;
570: return $tryserver;
571: } elsif ($answer eq 'no_host') {
572: $badServerCache{$tryserver}=1;
573: }
574: }
575: }
576: return 'no_host';
577: }
578:
579: # ------------------------------------- Find the usernames behind a list of IDs
580:
581: sub idget {
582: my ($udom,@ids)=@_;
583: my %returnhash=();
584:
585: my $tryserver;
586: foreach $tryserver (keys %libserv) {
587: if ($hostdom{$tryserver} eq $udom) {
588: my $idlist=join('&',@ids);
589: $idlist=~tr/A-Z/a-z/;
590: my $reply=&reply("idget:$udom:".$idlist,$tryserver);
591: my @answer=();
592: if (($reply ne 'con_lost') && ($reply!~/^error\:/)) {
593: @answer=split(/\&/,$reply);
594: } ;
595: my $i;
596: for ($i=0;$i<=$#ids;$i++) {
597: if ($answer[$i]) {
598: $returnhash{$ids[$i]}=$answer[$i];
599: }
600: }
601: }
602: }
603: return %returnhash;
604: }
605:
606: # ------------------------------------- Find the IDs behind a list of usernames
607:
608: sub idrget {
609: my ($udom,@unames)=@_;
610: my %returnhash=();
611: foreach (@unames) {
612: $returnhash{$_}=(&userenvironment($udom,$_,'id'))[1];
613: }
614: return %returnhash;
615: }
616:
617: # ------------------------------- Store away a list of names and associated IDs
618:
619: sub idput {
620: my ($udom,%ids)=@_;
621: my %servers=();
622: foreach (keys %ids) {
623: my $uhom=&homeserver($_,$udom);
624: if ($uhom ne 'no_host') {
625: my $id=&escape($ids{$_});
626: $id=~tr/A-Z/a-z/;
627: my $unam=&escape($_);
628: if ($servers{$uhom}) {
629: $servers{$uhom}.='&'.$id.'='.$unam;
630: } else {
631: $servers{$uhom}=$id.'='.$unam;
632: }
633: &critical('put:'.$udom.':'.$unam.':environment:id='.$id,$uhom);
634: }
635: }
636: foreach (keys %servers) {
637: &critical('idput:'.$udom.':'.$servers{$_},$_);
638: }
639: }
640:
641: # --------------------------------------------------- Assign a key to a student
642:
643: sub assign_access_key {
644: #
645: # a valid key looks like uname:udom#comments
646: # comments are being appended
647: #
648: my ($ckey,$cdom,$cnum,$udom,$uname,$logentry)=@_;
649: $cdom=
650: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'} unless (defined($cdom));
651: $cnum=
652: $ENV{'course.'.$ENV{'request.course.id'}.'.num'} unless (defined($cnum));
653: $udom=$ENV{'user.name'} unless (defined($udom));
654: $uname=$ENV{'user.domain'} unless (defined($uname));
655: my %existing=&get('accesskeys',[$ckey],$cdom,$cnum);
656: if (($existing{$ckey}=~/^\#(.*)$/) || # - new key
657: ($existing{$ckey}=~/^$uname\:$udom\#(.*)$/)) {
658: # assigned to this person
659: # - this should not happen,
660: # unless something went wrong
661: # the first time around
662: # ready to assign
663: $logentry=$1.'; '.$logentry;
664: if (&put('accesskey',{$ckey=>$uname.':'.$udom.'#'.$logentry},
665: $cdom,$cnum) eq 'ok') {
666: # key now belongs to user
667: my $envkey='key.'.$cdom.'_'.$cnum;
668: if (&put('environment',{$envkey => $ckey}) eq 'ok') {
669: &appenv('environment.'.$envkey => $ckey);
670: return 'ok';
671: } else {
672: return
673: 'error: Count not permanently assign key, will need to be re-entered later.';
674: }
675: } else {
676: return 'error: Could not assign key, try again later.';
677: }
678: } elsif (!$existing{$ckey}) {
679: # the key does not exist
680: return 'error: The key does not exist';
681: } else {
682: # the key is somebody else's
683: return 'error: The key is already in use';
684: }
685: }
686:
687: # ------------------------------------------ put an additional comment on a key
688:
689: sub comment_access_key {
690: #
691: # a valid key looks like uname:udom#comments
692: # comments are being appended
693: #
694: my ($ckey,$cdom,$cnum,$logentry)=@_;
695: $cdom=
696: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'} unless (defined($cdom));
697: $cnum=
698: $ENV{'course.'.$ENV{'request.course.id'}.'.num'} unless (defined($cnum));
699: my %existing=&get('accesskeys',[$ckey],$cdom,$cnum);
700: if ($existing{$ckey}) {
701: $existing{$ckey}.='; '.$logentry;
702: # ready to assign
703: if (&put('accesskeys',{$ckey=>$existing{$ckey}},
704: $cdom,$cnum) eq 'ok') {
705: return 'ok';
706: } else {
707: return 'error: Count not store comment.';
708: }
709: } else {
710: # the key does not exist
711: return 'error: The key does not exist';
712: }
713: }
714:
715: # ------------------------------------------------------ Generate a set of keys
716:
717: sub generate_access_keys {
718: my ($number,$cdom,$cnum,$logentry)=@_;
719: $cdom=
720: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'} unless (defined($cdom));
721: $cnum=
722: $ENV{'course.'.$ENV{'request.course.id'}.'.num'} unless (defined($cnum));
723: unless (&allowed('mky',$cdom)) { return 0; }
724: unless (($cdom) && ($cnum)) { return 0; }
725: if ($number>10000) { return 0; }
726: sleep(2); # make sure don't get same seed twice
727: srand(time()^($$+($$<<15))); # from "Programming Perl"
728: my $total=0;
729: for (my $i=1;$i<=$number;$i++) {
730: my $newkey=sprintf("%lx",int(100000*rand)).'-'.
731: sprintf("%lx",int(100000*rand)).'-'.
732: sprintf("%lx",int(100000*rand));
733: $newkey=~s/1/g/g; # folks mix up 1 and l
734: $newkey=~s/0/h/g; # and also 0 and O
735: my %existing=&get('accesskeys',[$newkey],$cdom,$cnum);
736: if ($existing{$newkey}) {
737: $i--;
738: } else {
739: if (&put('accesskeys',
740: { $newkey => '# generated '.localtime().
741: ' by '.$ENV{'user.name'}.'@'.$ENV{'user.domain'}.
742: '; '.$logentry },
743: $cdom,$cnum) eq 'ok') {
744: $total++;
745: }
746: }
747: }
748: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},
749: 'Generated '.$total.' keys for '.$cnum.' at '.$cdom);
750: return $total;
751: }
752:
753: # ------------------------------------------------------- Validate an accesskey
754:
755: sub validate_access_key {
756: my ($ckey,$cdom,$cnum,$udom,$uname)=@_;
757: $cdom=
758: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'} unless (defined($cdom));
759: $cnum=
760: $ENV{'course.'.$ENV{'request.course.id'}.'.num'} unless (defined($cnum));
761: $udom=$ENV{'user.name'} unless (defined($udom));
762: $uname=$ENV{'user.domain'} unless (defined($uname));
763: my %existing=&get('accesskeys',[$ckey],$cdom,$cnum);
764: return ($existing{$ckey}=~/^$uname\:$udom\#/);
765: }
766:
767: # ------------------------------------- Find the section of student in a course
768:
769: sub getsection {
770: my ($udom,$unam,$courseid)=@_;
771: $courseid=~s/\_/\//g;
772: $courseid=~s/^(\w)/\/$1/;
773: my %Pending;
774: my %Expired;
775: #
776: # Each role can either have not started yet (pending), be active,
777: # or have expired.
778: #
779: # If there is an active role, we are done.
780: #
781: # If there is more than one role which has not started yet,
782: # choose the one which will start sooner
783: # If there is one role which has not started yet, return it.
784: #
785: # If there is more than one expired role, choose the one which ended last.
786: # If there is a role which has expired, return it.
787: #
788: foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
789: &homeserver($unam,$udom)))) {
790: my ($key,$value)=split(/\=/,$_);
791: $key=&unescape($key);
792: next if ($key !~/^$courseid(?:\/)*(\w+)*\_st$/);
793: my $section=$1;
794: if ($key eq $courseid.'_st') { $section=''; }
795: my ($dummy,$end,$start)=split(/\_/,&unescape($value));
796: my $now=time;
797: if (defined($end) && ($now > $end)) {
798: $Expired{$end}=$section;
799: next;
800: }
801: if (defined($start) && ($now < $start)) {
802: $Pending{$start}=$section;
803: next;
804: }
805: return $section;
806: }
807: #
808: # Presumedly there will be few matching roles from the above
809: # loop and the sorting time will be negligible.
810: if (scalar(keys(%Pending))) {
811: my ($time) = sort {$a <=> $b} keys(%Pending);
812: return $Pending{$time};
813: }
814: if (scalar(keys(%Expired))) {
815: my @sorted = sort {$a <=> $b} keys(%Expired);
816: my $time = pop(@sorted);
817: return $Expired{$time};
818: }
819: return '-1';
820: }
821:
822: sub usection {
823: my ($udom,$unam,$courseid)=@_;
824: $courseid=~s/\_/\//g;
825: $courseid=~s/^(\w)/\/$1/;
826: foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
827: &homeserver($unam,$udom)))) {
828: my ($key,$value)=split(/\=/,$_);
829: $key=&unescape($key);
830: if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
831: my $section=$1;
832: if ($key eq $courseid.'_st') { $section=''; }
833: my ($dummy,$end,$start)=split(/\_/,&unescape($value));
834: my $now=time;
835: my $notactive=0;
836: if ($start) {
837: if ($now<$start) { $notactive=1; }
838: }
839: if ($end) {
840: if ($now>$end) { $notactive=1; }
841: }
842: unless ($notactive) { return $section; }
843: }
844: }
845: return '-1';
846: }
847:
848: # ------------------------------------- Read an entry from a user's environment
849:
850: sub userenvironment {
851: my ($udom,$unam,@what)=@_;
852: my %returnhash=();
853: my @answer=split(/\&/,
854: &reply('get:'.$udom.':'.$unam.':environment:'.join('&',@what),
855: &homeserver($unam,$udom)));
856: my $i;
857: for ($i=0;$i<=$#what;$i++) {
858: $returnhash{$what[$i]}=&unescape($answer[$i]);
859: }
860: return %returnhash;
861: }
862:
863: # -------------------------------------------------------------------- New chat
864:
865: sub chatsend {
866: my ($newentry,$anon)=@_;
867: my $cnum=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
868: my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
869: my $chome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
870: &reply('chatsend:'.$cdom.':'.$cnum.':'.
871: &escape($ENV{'user.domain'}.':'.$ENV{'user.name'}.':'.$anon.':'.
872: &escape($newentry)),$chome);
873: }
874:
875: # ------------------------------------------ Find current version of a resource
876:
877: sub getversion {
878: my $fname=&clutter(shift);
879: unless ($fname=~/^\/res\//) { return -1; }
880: return ¤tversion(&filelocation('',$fname));
881: }
882:
883: sub currentversion {
884: my $fname=shift;
885: my $author=$fname;
886: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
887: my ($udom,$uname)=split(/\//,$author);
888: my $home=homeserver($uname,$udom);
889: if ($home eq 'no_host') {
890: return -1;
891: }
892: my $answer=reply("currentversion:$fname",$home);
893: if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
894: return -1;
895: }
896: return $answer;
897: }
898:
899: # ----------------------------- Subscribe to a resource, return URL if possible
900:
901: sub subscribe {
902: my $fname=shift;
903: if ($fname=~/\/(aboutme|syllabus|bulletinboard|smppg)$/) { return ''; }
904: my $author=$fname;
905: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
906: my ($udom,$uname)=split(/\//,$author);
907: my $home=homeserver($uname,$udom);
908: if ($home eq 'no_host') {
909: return 'not_found';
910: }
911: my $answer=reply("sub:$fname",$home);
912: if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
913: $answer.=' by '.$home;
914: }
915: return $answer;
916: }
917:
918: # -------------------------------------------------------------- Replicate file
919:
920: sub repcopy {
921: my $filename=shift;
922: $filename=~s/\/+/\//g;
923: if ($filename=~/^\/home\/httpd\/html\/adm\//) { return OK; }
924: my $transname="$filename.in.transfer";
925: if ((-e $filename) || (-e $transname)) { return OK; }
926: my $remoteurl=subscribe($filename);
927: if ($remoteurl =~ /^con_lost by/) {
928: &logthis("Subscribe returned $remoteurl: $filename");
929: return HTTP_SERVICE_UNAVAILABLE;
930: } elsif ($remoteurl eq 'not_found') {
931: &logthis("Subscribe returned not_found: $filename");
932: return HTTP_NOT_FOUND;
933: } elsif ($remoteurl =~ /^rejected by/) {
934: &logthis("Subscribe returned $remoteurl: $filename");
935: return FORBIDDEN;
936: } elsif ($remoteurl eq 'directory') {
937: return OK;
938: } else {
939: my $author=$filename;
940: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
941: my ($udom,$uname)=split(/\//,$author);
942: my $home=homeserver($uname,$udom);
943: unless ($home eq $perlvar{'lonHostID'}) {
944: my @parts=split(/\//,$filename);
945: my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";
946: if ($path ne "$perlvar{'lonDocRoot'}/res") {
947: &logthis("Malconfiguration for replication: $filename");
948: return HTTP_BAD_REQUEST;
949: }
950: my $count;
951: for ($count=5;$count<$#parts;$count++) {
952: $path.="/$parts[$count]";
953: if ((-e $path)!=1) {
954: mkdir($path,0777);
955: }
956: }
957: my $ua=new LWP::UserAgent;
958: my $request=new HTTP::Request('GET',"$remoteurl");
959: my $response=$ua->request($request,$transname);
960: if ($response->is_error()) {
961: unlink($transname);
962: my $message=$response->status_line;
963: &logthis("<font color=blue>WARNING:"
964: ." LWP get: $message: $filename</font>");
965: return HTTP_SERVICE_UNAVAILABLE;
966: } else {
967: if ($remoteurl!~/\.meta$/) {
968: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
969: my $mresponse=$ua->request($mrequest,$filename.'.meta');
970: if ($mresponse->is_error()) {
971: unlink($filename.'.meta');
972: &logthis(
973: "<font color=yellow>INFO: No metadata: $filename</font>");
974: }
975: }
976: rename($transname,$filename);
977: return OK;
978: }
979: }
980: }
981: }
982:
983: # ------------------------------------------------ Get server side include body
984: sub ssi_body {
985: my ($filelink,%form)=@_;
986: my $output=($filelink=~/^http\:/?&externalssi($filelink):
987: &ssi($filelink,%form));
988: $output=~s/^.*\<body[^\>]*\>//si;
989: $output=~s/\<\/body\s*\>.*$//si;
990: $output=~
991: s/\/\/ BEGIN LON\-CAPA Internal.+\/\/ END LON\-CAPA Internal\s//gs;
992: return $output;
993: }
994:
995: # --------------------------------------------------------- Server Side Include
996:
997: sub ssi {
998:
999: my ($fn,%form)=@_;
1000:
1001: my $ua=new LWP::UserAgent;
1002:
1003: my $request;
1004:
1005: if (%form) {
1006: $request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);
1007: $request->content(join('&',map { &escape($_).'='.&escape($form{$_}) } keys %form));
1008: } else {
1009: $request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);
1010: }
1011:
1012: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
1013: my $response=$ua->request($request);
1014:
1015: return $response->content;
1016: }
1017:
1018: sub externalssi {
1019: my ($url)=@_;
1020: my $ua=new LWP::UserAgent;
1021: my $request=new HTTP::Request('GET',$url);
1022: my $response=$ua->request($request);
1023: return $response->content;
1024: }
1025:
1026: # ------- Add a token to a remote URI's query string to vouch for access rights
1027:
1028: sub tokenwrapper {
1029: my $uri=shift;
1030: $uri=~s/^http\:\/\/([^\/]+)//;
1031: $uri=~s/^\///;
1032: $ENV{'user.environment'}=~/\/([^\/]+)\.id/;
1033: my $token=$1;
1034: if ($uri=~/^uploaded\/([^\/]+)\/([^\/]+)\/([^\/]+)(\?\.*)*$/) {
1035: &appenv('userfile.'.$1.'/'.$2.'/'.$3 => $ENV{'request.course.id'});
1036: return 'http://'.$hostname{ &homeserver($2,$1)}.'/'.$uri.
1037: (($uri=~/\?/)?'&':'?').'token='.$token.
1038: '&tokenissued='.$perlvar{'lonHostID'};
1039: } else {
1040: return '/adm/notfound.html';
1041: }
1042: }
1043:
1044: # --------------- Take an uploaded file and put it into the userfiles directory
1045: # input: name of form element, coursedoc=1 means this is for the course
1046: # output: url of file in userspace
1047:
1048: sub userfileupload {
1049: my ($formname,$coursedoc)=@_;
1050: my $fname=$ENV{'form.'.$formname.'.filename'};
1051: # Replace Windows backslashes by forward slashes
1052: $fname=~s/\\/\//g;
1053: # Get rid of everything but the actual filename
1054: $fname=~s/^.*\/([^\/]+)$/$1/;
1055: # Replace spaces by underscores
1056: $fname=~s/\s+/\_/g;
1057: # Replace all other weird characters by nothing
1058: $fname=~s/[^\w\.\-]//g;
1059: # See if there is anything left
1060: unless ($fname) { return 'error: no uploaded file'; }
1061: chop($ENV{'form.'.$formname});
1062: # Create the directory if not present
1063: my $docuname='';
1064: my $docudom='';
1065: my $docuhome='';
1066: if ($coursedoc) {
1067: $docuname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
1068: $docudom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
1069: $docuhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
1070: } else {
1071: $docuname=$ENV{'user.name'};
1072: $docudom=$ENV{'user.domain'};
1073: $docuhome=$ENV{'user.home'};
1074: }
1075: return
1076: &finishuserfileupload($docuname,$docudom,$docuhome,$formname,$fname);
1077: }
1078:
1079: sub finishuserfileupload {
1080: my ($docuname,$docudom,$docuhome,$formname,$fname)=@_;
1081: my $path=$docudom.'/'.$docuname.'/';
1082: my $filepath=$perlvar{'lonDocRoot'};
1083: my @parts=split(/\//,$filepath.'/userfiles/'.$path);
1084: my $count;
1085: for ($count=4;$count<=$#parts;$count++) {
1086: $filepath.="/$parts[$count]";
1087: if ((-e $filepath)!=1) {
1088: mkdir($filepath,0777);
1089: }
1090: }
1091: # Save the file
1092: {
1093: my $fh=Apache::File->new('>'.$filepath.'/'.$fname);
1094: print $fh $ENV{'form.'.$formname};
1095: }
1096: # Notify homeserver to grep it
1097: #
1098:
1099: my $fetchresult=
1100: &reply('fetchuserfile:'.$docudom.'/'.$docuname.'/'.$fname,$docuhome);
1101: if ($fetchresult eq 'ok') {
1102: #
1103: # Return the URL to it
1104: return '/uploaded/'.$path.$fname;
1105: } else {
1106: &logthis('Failed to transfer '.$docudom.'/'.$docuname.'/'.$fname.
1107: ' to host '.$docuhome.': '.$fetchresult);
1108: return '/adm/notfound.html';
1109: }
1110: }
1111:
1112: # ------------------------------------------------------------------------- Log
1113:
1114: sub log {
1115: my ($dom,$nam,$hom,$what)=@_;
1116: return critical("log:$dom:$nam:$what",$hom);
1117: }
1118:
1119: # ------------------------------------------------------------------ Course Log
1120: #
1121: # This routine flushes several buffers of non-mission-critical nature
1122: #
1123:
1124: sub flushcourselogs {
1125: &logthis('Flushing log buffers');
1126: #
1127: # course logs
1128: # This is a log of all transactions in a course, which can be used
1129: # for data mining purposes
1130: #
1131: # It also collects the courseid database, which lists last transaction
1132: # times and course titles for all courseids
1133: #
1134: my %courseidbuffer=();
1135: foreach (keys %courselogs) {
1136: my $crsid=$_;
1137: if (&reply('log:'.$coursedombuf{$crsid}.':'.$coursenumbuf{$crsid}.':'.
1138: &escape($courselogs{$crsid}),
1139: $coursehombuf{$crsid}) eq 'ok') {
1140: delete $courselogs{$crsid};
1141: } else {
1142: &logthis('Failed to flush log buffer for '.$crsid);
1143: if (length($courselogs{$crsid})>40000) {
1144: &logthis("<font color=blue>WARNING: Buffer for ".$crsid.
1145: " exceeded maximum size, deleting.</font>");
1146: delete $courselogs{$crsid};
1147: }
1148: }
1149: if ($courseidbuffer{$coursehombuf{$crsid}}) {
1150: $courseidbuffer{$coursehombuf{$crsid}}.='&'.
1151: &escape($crsid).'='.&escape($coursedescrbuf{$crsid});
1152: } else {
1153: $courseidbuffer{$coursehombuf{$crsid}}=
1154: &escape($crsid).'='.&escape($coursedescrbuf{$crsid});
1155: }
1156: }
1157: #
1158: # Write course id database (reverse lookup) to homeserver of courses
1159: # Is used in pickcourse
1160: #
1161: foreach (keys %courseidbuffer) {
1162: &courseidput($hostdom{$_},$courseidbuffer{$_},$_);
1163: }
1164: #
1165: # File accesses
1166: # Writes to the dynamic metadata of resources to get hit counts, etc.
1167: #
1168: foreach (keys %accesshash) {
1169: my $entry=$_;
1170: $entry=~/\_\_\_(\w+)\/(\w+)\/(.*)\_\_\_(\w+)$/;
1171: my %temphash=($entry => $accesshash{$entry});
1172: if (&Apache::lonnet::put('nohist_resevaldata',\%temphash,$1,$2) eq 'ok') {
1173: delete $accesshash{$entry};
1174: }
1175: }
1176: #
1177: # Roles
1178: # Reverse lookup of user roles for course faculty/staff and co-authorship
1179: #
1180: foreach (keys %userrolehash) {
1181: my $entry=$_;
1182: my ($role,$uname,$udom,$runame,$rudom,$rsec)=
1183: split(/\:/,$entry);
1184: if (&Apache::lonnet::put('nohist_userroles',
1185: { $role.':'.$uname.':'.$udom.':'.$rsec => $userrolehash{$entry} },
1186: $rudom,$runame) eq 'ok') {
1187: delete $userrolehash{$entry};
1188: }
1189: }
1190: $dumpcount++;
1191: }
1192:
1193: sub courselog {
1194: my $what=shift;
1195: $what=time.':'.$what;
1196: unless ($ENV{'request.course.id'}) { return ''; }
1197: $coursedombuf{$ENV{'request.course.id'}}=
1198: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
1199: $coursenumbuf{$ENV{'request.course.id'}}=
1200: $ENV{'course.'.$ENV{'request.course.id'}.'.num'};
1201: $coursehombuf{$ENV{'request.course.id'}}=
1202: $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
1203: $coursedescrbuf{$ENV{'request.course.id'}}=
1204: $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
1205: if (defined $courselogs{$ENV{'request.course.id'}}) {
1206: $courselogs{$ENV{'request.course.id'}}.='&'.$what;
1207: } else {
1208: $courselogs{$ENV{'request.course.id'}}.=$what;
1209: }
1210: if (length($courselogs{$ENV{'request.course.id'}})>4048) {
1211: &flushcourselogs();
1212: }
1213: }
1214:
1215: sub courseacclog {
1216: my $fnsymb=shift;
1217: unless ($ENV{'request.course.id'}) { return ''; }
1218: my $what=$fnsymb.':'.$ENV{'user.name'}.':'.$ENV{'user.domain'};
1219: if ($fnsymb=~/(problem|exam|quiz|assess|survey|form)$/) {
1220: $what.=':POST';
1221: foreach (keys %ENV) {
1222: if ($_=~/^form\.(.*)/) {
1223: $what.=':'.$1.'='.$ENV{$_};
1224: }
1225: }
1226: }
1227: &courselog($what);
1228: }
1229:
1230: sub countacc {
1231: my $url=&declutter(shift);
1232: unless ($ENV{'request.course.id'}) { return ''; }
1233: $accesshash{$ENV{'request.course.id'}.'___'.$url.'___course'}=1;
1234: my $key=$$.$processmarker.'_'.$dumpcount.'___'.$url.'___count';
1235: if (defined($accesshash{$key})) {
1236: $accesshash{$key}++;
1237: } else {
1238: $accesshash{$key}=1;
1239: }
1240: }
1241:
1242: sub linklog {
1243: my ($from,$to)=@_;
1244: $from=&declutter($from);
1245: $to=&declutter($to);
1246: $accesshash{$from.'___'.$to.'___comefrom'}=1;
1247: $accesshash{$to.'___'.$from.'___goto'}=1;
1248: }
1249:
1250: sub userrolelog {
1251: my ($trole,$username,$domain,$area,$tstart,$tend)=@_;
1252: if (($trole=~/^ca/) || ($trole=~/^in/) ||
1253: ($trole=~/^cc/) || ($trole=~/^ep/) ||
1254: ($trole=~/^cr/)) {
1255: my (undef,$rudom,$runame,$rsec)=split(/\//,$area);
1256: $userrolehash
1257: {$trole.':'.$username.':'.$domain.':'.$runame.':'.$rudom.':'.$rsec}
1258: =$tend.':'.$tstart;
1259: }
1260: }
1261:
1262: sub get_course_adv_roles {
1263: my $cid=shift;
1264: $cid=$ENV{'request.course.id'} unless (defined($cid));
1265: my %coursehash=&coursedescription($cid);
1266: my %returnhash=();
1267: my %dumphash=
1268: &dump('nohist_userroles',$coursehash{'domain'},$coursehash{'num'});
1269: my $now=time;
1270: foreach (keys %dumphash) {
1271: my ($tend,$tstart)=split(/\:/,$dumphash{$_});
1272: if (($tstart) && ($tstart<0)) { next; }
1273: if (($tend) && ($tend<$now)) { next; }
1274: if (($tstart) && ($now<$tstart)) { next; }
1275: my ($role,$username,$domain,$section)=split(/\:/,$_);
1276: my $key=&plaintext($role);
1277: if ($section) { $key.=' (Sec/Grp '.$section.')'; }
1278: if ($returnhash{$key}) {
1279: $returnhash{$key}.=','.$username.':'.$domain;
1280: } else {
1281: $returnhash{$key}=$username.':'.$domain;
1282: }
1283: }
1284: return %returnhash;
1285: }
1286:
1287: sub get_my_roles {
1288: my ($uname,$udom)=@_;
1289: unless (defined($uname)) { $uname=$ENV{'user.name'}; }
1290: unless (defined($udom)) { $udom=$ENV{'user.domain'}; }
1291: my %dumphash=
1292: &dump('nohist_userroles',$udom,$uname);
1293: my %returnhash=();
1294: my $now=time;
1295: foreach (keys %dumphash) {
1296: my ($tend,$tstart)=split(/\:/,$dumphash{$_});
1297: if (($tstart) && ($tstart<0)) { next; }
1298: if (($tend) && ($tend<$now)) { next; }
1299: if (($tstart) && ($now<$tstart)) { next; }
1300: my ($role,$username,$domain,$section)=split(/\:/,$_);
1301: $returnhash{$username.':'.$domain.':'.$role}=$tstart.':'.$tend;
1302: }
1303: return %returnhash;
1304: }
1305:
1306: # ----------------------------------------------------- Frontpage Announcements
1307: #
1308: #
1309:
1310: sub postannounce {
1311: my ($server,$text)=@_;
1312: unless (&allowed('psa',$hostdom{$server})) { return 'refused'; }
1313: unless ($text=~/\w/) { $text=''; }
1314: return &reply('setannounce:'.&escape($text),$server);
1315: }
1316:
1317: sub getannounce {
1318: if (my $fh=Apache::File->new($perlvar{'lonDocRoot'}.'/announcement.txt')) {
1319: my $announcement='';
1320: while (<$fh>) { $announcement .=$_; }
1321: $fh->close();
1322: if ($announcement=~/\w/) {
1323: return
1324: '<table bgcolor="#FF5555" cellpadding="5" cellspacing="3">'.
1325: '<tr><td bgcolor="#FFFFFF"><pre>'.$announcement.'</pre></td></tr></table>';
1326: } else {
1327: return '';
1328: }
1329: } else {
1330: return '';
1331: }
1332: }
1333:
1334: # ---------------------------------------------------------- Course ID routines
1335: # Deal with domain's nohist_courseid.db files
1336: #
1337:
1338: sub courseidput {
1339: my ($domain,$what,$coursehome)=@_;
1340: return &reply('courseidput:'.$domain.':'.$what,$coursehome);
1341: }
1342:
1343: sub courseiddump {
1344: my ($domfilter,$descfilter,$sincefilter)=@_;
1345: my %returnhash=();
1346: unless ($domfilter) { $domfilter=''; }
1347: foreach my $tryserver (keys %libserv) {
1348: if ((!$domfilter) || ($hostdom{$tryserver} eq $domfilter)) {
1349: foreach (
1350: split(/\&/,&reply('courseiddump:'.$hostdom{$tryserver}.':'.
1351: $sincefilter.':'.&escape($descfilter),
1352: $tryserver))) {
1353: my ($key,$value)=split(/\=/,$_);
1354: if (($key) && ($value)) {
1355: $returnhash{&unescape($key)}=&unescape($value);
1356: }
1357: }
1358:
1359: }
1360: }
1361: return %returnhash;
1362: }
1363:
1364: #
1365: # ----------------------------------------------------------- Check out an item
1366:
1367: sub checkout {
1368: my ($symb,$tuname,$tudom,$tcrsid)=@_;
1369: my $now=time;
1370: my $lonhost=$perlvar{'lonHostID'};
1371: my $infostr=&escape(
1372: 'CHECKOUTTOKEN&'.
1373: $tuname.'&'.
1374: $tudom.'&'.
1375: $tcrsid.'&'.
1376: $symb.'&'.
1377: $now.'&'.$ENV{'REMOTE_ADDR'});
1378: my $token=&reply('tmpput:'.$infostr,$lonhost);
1379: if ($token=~/^error\:/) {
1380: &logthis("<font color=blue>WARNING: ".
1381: "Checkout tmpput failed ".$tudom.' - '.$tuname.' - '.$symb.
1382: "</font>");
1383: return '';
1384: }
1385:
1386: $token=~s/^(\d+)\_.*\_(\d+)$/$1\*$2\*$lonhost/;
1387: $token=~tr/a-z/A-Z/;
1388:
1389: my %infohash=('resource.0.outtoken' => $token,
1390: 'resource.0.checkouttime' => $now,
1391: 'resource.0.outremote' => $ENV{'REMOTE_ADDR'});
1392:
1393: unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
1394: return '';
1395: } else {
1396: &logthis("<font color=blue>WARNING: ".
1397: "Checkout cstore failed ".$tudom.' - '.$tuname.' - '.$symb.
1398: "</font>");
1399: }
1400:
1401: if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
1402: &escape('Checkout '.$infostr.' - '.
1403: $token)) ne 'ok') {
1404: return '';
1405: } else {
1406: &logthis("<font color=blue>WARNING: ".
1407: "Checkout log failed ".$tudom.' - '.$tuname.' - '.$symb.
1408: "</font>");
1409: }
1410: return $token;
1411: }
1412:
1413: # ------------------------------------------------------------ Check in an item
1414:
1415: sub checkin {
1416: my $token=shift;
1417: my $now=time;
1418: my ($ta,$tb,$lonhost)=split(/\*/,$token);
1419: $lonhost=~tr/A-Z/a-z/;
1420: my $dtoken=$ta.'_'.$hostip{$lonhost}.'_'.$tb;
1421: $dtoken=~s/\W/\_/g;
1422: my ($dummy,$tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=
1423: split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));
1424:
1425: unless (($tuname) && ($tudom)) {
1426: &logthis('Check in '.$token.' ('.$dtoken.') failed');
1427: return '';
1428: }
1429:
1430: unless (&allowed('mgr',$tcrsid)) {
1431: &logthis('Check in '.$token.' ('.$dtoken.') unauthorized: '.
1432: $ENV{'user.name'}.' - '.$ENV{'user.domain'});
1433: return '';
1434: }
1435:
1436: my %infohash=('resource.0.intoken' => $token,
1437: 'resource.0.checkintime' => $now,
1438: 'resource.0.inremote' => $ENV{'REMOTE_ADDR'});
1439:
1440: unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
1441: return '';
1442: }
1443:
1444: if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
1445: &escape('Checkin - '.$token)) ne 'ok') {
1446: return '';
1447: }
1448:
1449: return ($symb,$tuname,$tudom,$tcrsid);
1450: }
1451:
1452: # --------------------------------------------- Set Expire Date for Spreadsheet
1453:
1454: sub expirespread {
1455: my ($uname,$udom,$stype,$usymb)=@_;
1456: my $cid=$ENV{'request.course.id'};
1457: if ($cid) {
1458: my $now=time;
1459: my $key=$uname.':'.$udom.':'.$stype.':'.$usymb;
1460: return &reply('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
1461: $ENV{'course.'.$cid.'.num'}.
1462: ':nohist_expirationdates:'.
1463: &escape($key).'='.$now,
1464: $ENV{'course.'.$cid.'.home'})
1465: }
1466: return 'ok';
1467: }
1468:
1469: # ----------------------------------------------------- Devalidate Spreadsheets
1470:
1471: sub devalidate {
1472: my ($symb,$uname,$udom)=@_;
1473: my $cid=$ENV{'request.course.id'};
1474: if ($cid) {
1475: # delete the stored spreadsheets for
1476: # - the student level sheet of this user in course's homespace
1477: # - the assessment level sheet for this resource
1478: # for this user in user's homespace
1479: my $key=$uname.':'.$udom.':';
1480: my $status=
1481: &del('nohist_calculatedsheets',
1482: [$key.'studentcalc:'],
1483: $ENV{'course.'.$cid.'.domain'},
1484: $ENV{'course.'.$cid.'.num'})
1485: .' '.
1486: &del('nohist_calculatedsheets_'.$cid,
1487: [$key.'assesscalc:'.$symb],$udom,$uname);
1488: unless ($status eq 'ok ok') {
1489: &logthis('Could not devalidate spreadsheet '.
1490: $uname.' at '.$udom.' for '.
1491: $symb.': '.$status);
1492: }
1493: }
1494: }
1495:
1496: sub get_scalar {
1497: my ($string,$end) = @_;
1498: my $value;
1499: if ($$string =~ s/^([^&]*?)($end)/$2/) {
1500: $value = $1;
1501: } elsif ($$string =~ s/^([^&]*?)&//) {
1502: $value = $1;
1503: }
1504: return &unescape($value);
1505: }
1506:
1507: sub array2str {
1508: my (@array) = @_;
1509: my $result=&arrayref2str(\@array);
1510: $result=~s/^__ARRAY_REF__//;
1511: $result=~s/__END_ARRAY_REF__$//;
1512: return $result;
1513: }
1514:
1515: sub arrayref2str {
1516: my ($arrayref) = @_;
1517: my $result='__ARRAY_REF__';
1518: foreach my $elem (@$arrayref) {
1519: if(ref($elem) eq 'ARRAY') {
1520: $result.=&arrayref2str($elem).'&';
1521: } elsif(ref($elem) eq 'HASH') {
1522: $result.=&hashref2str($elem).'&';
1523: } elsif(ref($elem)) {
1524: #print("Got a ref of ".(ref($elem))." skipping.");
1525: } else {
1526: $result.=&escape($elem).'&';
1527: }
1528: }
1529: $result=~s/\&$//;
1530: $result .= '__END_ARRAY_REF__';
1531: return $result;
1532: }
1533:
1534: sub hash2str {
1535: my (%hash) = @_;
1536: my $result=&hashref2str(\%hash);
1537: $result=~s/^__HASH_REF__//;
1538: $result=~s/__END_HASH_REF__$//;
1539: return $result;
1540: }
1541:
1542: sub hashref2str {
1543: my ($hashref)=@_;
1544: my $result='__HASH_REF__';
1545: foreach (keys(%$hashref)) {
1546: if (ref($_) eq 'ARRAY') {
1547: $result.=&arrayref2str($_).'=';
1548: } elsif (ref($_) eq 'HASH') {
1549: $result.=&hashref2str($_).'=';
1550: } elsif (ref($_)) {
1551: $result.='=';
1552: #print("Got a ref of ".(ref($_))." skipping.");
1553: } else {
1554: if ($_) {$result.=&escape($_).'=';} else { last; }
1555: }
1556:
1557: if(ref($hashref->{$_}) eq 'ARRAY') {
1558: $result.=&arrayref2str($hashref->{$_}).'&';
1559: } elsif(ref($hashref->{$_}) eq 'HASH') {
1560: $result.=&hashref2str($hashref->{$_}).'&';
1561: } elsif(ref($hashref->{$_})) {
1562: $result.='&';
1563: #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
1564: } else {
1565: $result.=&escape($hashref->{$_}).'&';
1566: }
1567: }
1568: $result=~s/\&$//;
1569: $result .= '__END_HASH_REF__';
1570: return $result;
1571: }
1572:
1573: sub str2hash {
1574: my ($string)=@_;
1575: my ($hash)=&str2hashref('__HASH_REF__'.$string.'__END_HASH_REF__');
1576: return %$hash;
1577: }
1578:
1579: sub str2hashref {
1580: my ($string) = @_;
1581:
1582: my %hash;
1583:
1584: if($string !~ /^__HASH_REF__/) {
1585: if (! ($string eq '' || !defined($string))) {
1586: $hash{'error'}='Not hash reference';
1587: }
1588: return (\%hash, $string);
1589: }
1590:
1591: $string =~ s/^__HASH_REF__//;
1592:
1593: while($string !~ /^__END_HASH_REF__/) {
1594: #key
1595: my $key='';
1596: if($string =~ /^__HASH_REF__/) {
1597: ($key, $string)=&str2hashref($string);
1598: if(defined($key->{'error'})) {
1599: $hash{'error'}='Bad data';
1600: return (\%hash, $string);
1601: }
1602: } elsif($string =~ /^__ARRAY_REF__/) {
1603: ($key, $string)=&str2arrayref($string);
1604: if($key->[0] eq 'Array reference error') {
1605: $hash{'error'}='Bad data';
1606: return (\%hash, $string);
1607: }
1608: } else {
1609: $string =~ s/^(.*?)=//;
1610: $key=&unescape($1);
1611: }
1612: $string =~ s/^=//;
1613:
1614: #value
1615: my $value='';
1616: if($string =~ /^__HASH_REF__/) {
1617: ($value, $string)=&str2hashref($string);
1618: if(defined($value->{'error'})) {
1619: $hash{'error'}='Bad data';
1620: return (\%hash, $string);
1621: }
1622: } elsif($string =~ /^__ARRAY_REF__/) {
1623: ($value, $string)=&str2arrayref($string);
1624: if($value->[0] eq 'Array reference error') {
1625: $hash{'error'}='Bad data';
1626: return (\%hash, $string);
1627: }
1628: } else {
1629: $value=&get_scalar(\$string,'__END_HASH_REF__');
1630: }
1631: $string =~ s/^&//;
1632:
1633: $hash{$key}=$value;
1634: }
1635:
1636: $string =~ s/^__END_HASH_REF__//;
1637:
1638: return (\%hash, $string);
1639: }
1640:
1641: sub str2array {
1642: my ($string)=@_;
1643: my ($array)=&str2arrayref('__ARRAY_REF__'.$string.'__END_ARRAY_REF__');
1644: return @$array;
1645: }
1646:
1647: sub str2arrayref {
1648: my ($string) = @_;
1649: my @array;
1650:
1651: if($string !~ /^__ARRAY_REF__/) {
1652: if (! ($string eq '' || !defined($string))) {
1653: $array[0]='Array reference error';
1654: }
1655: return (\@array, $string);
1656: }
1657:
1658: $string =~ s/^__ARRAY_REF__//;
1659:
1660: while($string !~ /^__END_ARRAY_REF__/) {
1661: my $value='';
1662: if($string =~ /^__HASH_REF__/) {
1663: ($value, $string)=&str2hashref($string);
1664: if(defined($value->{'error'})) {
1665: $array[0] ='Array reference error';
1666: return (\@array, $string);
1667: }
1668: } elsif($string =~ /^__ARRAY_REF__/) {
1669: ($value, $string)=&str2arrayref($string);
1670: if($value->[0] eq 'Array reference error') {
1671: $array[0] ='Array reference error';
1672: return (\@array, $string);
1673: }
1674: } else {
1675: $value=&get_scalar(\$string,'__END_ARRAY_REF__');
1676: }
1677: $string =~ s/^&//;
1678:
1679: push(@array, $value);
1680: }
1681:
1682: $string =~ s/^__END_ARRAY_REF__//;
1683:
1684: return (\@array, $string);
1685: }
1686:
1687: # -------------------------------------------------------------------Temp Store
1688:
1689: sub tmpreset {
1690: my ($symb,$namespace,$domain,$stuname) = @_;
1691: if (!$symb) {
1692: $symb=&symbread();
1693: if (!$symb) { $symb= $ENV{'request.url'}; }
1694: }
1695: $symb=escape($symb);
1696:
1697: if (!$namespace) { $namespace=$ENV{'request.state'}; }
1698: $namespace=~s/\//\_/g;
1699: $namespace=~s/\W//g;
1700:
1701: #FIXME needs to do something for /pub resources
1702: if (!$domain) { $domain=$ENV{'user.domain'}; }
1703: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1704: my $path=$perlvar{'lonDaemons'}.'/tmp';
1705: my %hash;
1706: if (tie(%hash,'GDBM_File',
1707: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1708: &GDBM_WRCREAT(),0640)) {
1709: foreach my $key (keys %hash) {
1710: if ($key=~ /:$symb/) {
1711: delete($hash{$key});
1712: }
1713: }
1714: }
1715: }
1716:
1717: sub tmpstore {
1718: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1719:
1720: if (!$symb) {
1721: $symb=&symbread();
1722: if (!$symb) { $symb= $ENV{'request.url'}; }
1723: }
1724: $symb=escape($symb);
1725:
1726: if (!$namespace) {
1727: # I don't think we would ever want to store this for a course.
1728: # it seems this will only be used if we don't have a course.
1729: #$namespace=$ENV{'request.course.id'};
1730: #if (!$namespace) {
1731: $namespace=$ENV{'request.state'};
1732: #}
1733: }
1734: $namespace=~s/\//\_/g;
1735: $namespace=~s/\W//g;
1736: #FIXME needs to do something for /pub resources
1737: if (!$domain) { $domain=$ENV{'user.domain'}; }
1738: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1739: my $now=time;
1740: my %hash;
1741: my $path=$perlvar{'lonDaemons'}.'/tmp';
1742: if (tie(%hash,'GDBM_File',
1743: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1744: &GDBM_WRCREAT(),0640)) {
1745: $hash{"version:$symb"}++;
1746: my $version=$hash{"version:$symb"};
1747: my $allkeys='';
1748: foreach my $key (keys(%$storehash)) {
1749: $allkeys.=$key.':';
1750: $hash{"$version:$symb:$key"}=$$storehash{$key};
1751: }
1752: $hash{"$version:$symb:timestamp"}=$now;
1753: $allkeys.='timestamp';
1754: $hash{"$version:keys:$symb"}=$allkeys;
1755: if (untie(%hash)) {
1756: return 'ok';
1757: } else {
1758: return "error:$!";
1759: }
1760: } else {
1761: return "error:$!";
1762: }
1763: }
1764:
1765: # -----------------------------------------------------------------Temp Restore
1766:
1767: sub tmprestore {
1768: my ($symb,$namespace,$domain,$stuname) = @_;
1769:
1770: if (!$symb) {
1771: $symb=&symbread();
1772: if (!$symb) { $symb= $ENV{'request.url'}; }
1773: }
1774: $symb=escape($symb);
1775:
1776: if (!$namespace) { $namespace=$ENV{'request.state'}; }
1777: #FIXME needs to do something for /pub resources
1778: if (!$domain) { $domain=$ENV{'user.domain'}; }
1779: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1780:
1781: my %returnhash;
1782: $namespace=~s/\//\_/g;
1783: $namespace=~s/\W//g;
1784: my %hash;
1785: my $path=$perlvar{'lonDaemons'}.'/tmp';
1786: if (tie(%hash,'GDBM_File',
1787: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1788: &GDBM_READER(),0640)) {
1789: my $version=$hash{"version:$symb"};
1790: $returnhash{'version'}=$version;
1791: my $scope;
1792: for ($scope=1;$scope<=$version;$scope++) {
1793: my $vkeys=$hash{"$scope:keys:$symb"};
1794: my @keys=split(/:/,$vkeys);
1795: my $key;
1796: $returnhash{"$scope:keys"}=$vkeys;
1797: foreach $key (@keys) {
1798: $returnhash{"$scope:$key"}=$hash{"$scope:$symb:$key"};
1799: $returnhash{"$key"}=$hash{"$scope:$symb:$key"};
1800: }
1801: }
1802: if (!(untie(%hash))) {
1803: return "error:$!";
1804: }
1805: } else {
1806: return "error:$!";
1807: }
1808: return %returnhash;
1809: }
1810:
1811: # ----------------------------------------------------------------------- Store
1812:
1813: sub store {
1814: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1815: my $home='';
1816:
1817: if ($stuname) { $home=&homeserver($stuname,$domain); }
1818:
1819: $symb=&symbclean($symb);
1820: if (!$symb) { unless ($symb=&symbread()) { return ''; } }
1821:
1822: if (!$domain) { $domain=$ENV{'user.domain'}; }
1823: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1824:
1825: &devalidate($symb,$stuname,$domain);
1826:
1827: $symb=escape($symb);
1828: if (!$namespace) {
1829: unless ($namespace=$ENV{'request.course.id'}) {
1830: return '';
1831: }
1832: }
1833: if (!$home) { $home=$ENV{'user.home'}; }
1834: my $namevalue='';
1835: foreach (keys %$storehash) {
1836: $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
1837: }
1838: $namevalue=~s/\&$//;
1839: &courselog($symb.':'.$stuname.':'.$domain.':STORE:'.$namevalue);
1840: return reply("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
1841: }
1842:
1843: # -------------------------------------------------------------- Critical Store
1844:
1845: sub cstore {
1846: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1847: my $home='';
1848:
1849: if ($stuname) { $home=&homeserver($stuname,$domain); }
1850:
1851: $symb=&symbclean($symb);
1852: if (!$symb) { unless ($symb=&symbread()) { return ''; } }
1853:
1854: if (!$domain) { $domain=$ENV{'user.domain'}; }
1855: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1856:
1857: &devalidate($symb,$stuname,$domain);
1858:
1859: $symb=escape($symb);
1860: if (!$namespace) {
1861: unless ($namespace=$ENV{'request.course.id'}) {
1862: return '';
1863: }
1864: }
1865: if (!$home) { $home=$ENV{'user.home'}; }
1866:
1867: my $namevalue='';
1868: foreach (keys %$storehash) {
1869: $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
1870: }
1871: $namevalue=~s/\&$//;
1872: &courselog($symb.':'.$stuname.':'.$domain.':CSTORE:'.$namevalue);
1873: return critical
1874: ("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
1875: }
1876:
1877: # --------------------------------------------------------------------- Restore
1878:
1879: sub restore {
1880: my ($symb,$namespace,$domain,$stuname) = @_;
1881: my $home='';
1882:
1883: if ($stuname) { $home=&homeserver($stuname,$domain); }
1884:
1885: if (!$symb) {
1886: unless ($symb=escape(&symbread())) { return ''; }
1887: } else {
1888: $symb=&escape(&symbclean($symb));
1889: }
1890: if (!$namespace) {
1891: unless ($namespace=$ENV{'request.course.id'}) {
1892: return '';
1893: }
1894: }
1895: if (!$domain) { $domain=$ENV{'user.domain'}; }
1896: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1897: if (!$home) { $home=$ENV{'user.home'}; }
1898: my $answer=&reply("restore:$domain:$stuname:$namespace:$symb","$home");
1899:
1900: my %returnhash=();
1901: foreach (split(/\&/,$answer)) {
1902: my ($name,$value)=split(/\=/,$_);
1903: $returnhash{&unescape($name)}=&unescape($value);
1904: }
1905: my $version;
1906: for ($version=1;$version<=$returnhash{'version'};$version++) {
1907: foreach (split(/\:/,$returnhash{$version.':keys'})) {
1908: $returnhash{$_}=$returnhash{$version.':'.$_};
1909: }
1910: }
1911: return %returnhash;
1912: }
1913:
1914: # ---------------------------------------------------------- Course Description
1915:
1916: sub coursedescription {
1917: my $courseid=shift;
1918: $courseid=~s/^\///;
1919: $courseid=~s/\_/\//g;
1920: my ($cdomain,$cnum)=split(/\//,$courseid);
1921: my $chome=&homeserver($cnum,$cdomain);
1922: my $normalid=$cdomain.'_'.$cnum;
1923: # need to always cache even if we get errors otherwise we keep
1924: # trying and trying and trying to get the course description.
1925: my %envhash=();
1926: my %returnhash=();
1927: $envhash{'course.'.$normalid.'.last_cache'}=time;
1928: if ($chome ne 'no_host') {
1929: %returnhash=&dump('environment',$cdomain,$cnum);
1930: if (!exists($returnhash{'con_lost'})) {
1931: $returnhash{'home'}= $chome;
1932: $returnhash{'domain'} = $cdomain;
1933: $returnhash{'num'} = $cnum;
1934: while (my ($name,$value) = each %returnhash) {
1935: $envhash{'course.'.$normalid.'.'.$name}=$value;
1936: }
1937: $returnhash{'url'}=&clutter($returnhash{'url'});
1938: $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
1939: $ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
1940: $envhash{'course.'.$normalid.'.home'}=$chome;
1941: $envhash{'course.'.$normalid.'.domain'}=$cdomain;
1942: $envhash{'course.'.$normalid.'.num'}=$cnum;
1943: }
1944: }
1945: &appenv(%envhash);
1946: return %returnhash;
1947: }
1948:
1949: # -------------------------------------------------------- Get user privileges
1950:
1951: sub rolesinit {
1952: my ($domain,$username,$authhost)=@_;
1953: my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
1954: if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return ''; }
1955: my %allroles=();
1956: my %thesepriv=();
1957: my $now=time;
1958: my $userroles="user.login.time=$now\n";
1959: my $thesestr;
1960:
1961: if ($rolesdump ne '') {
1962: foreach (split(/&/,$rolesdump)) {
1963: if ($_!~/^rolesdef\&/) {
1964: my ($area,$role)=split(/=/,$_);
1965: $area=~s/\_\w\w$//;
1966: my ($trole,$tend,$tstart)=split(/_/,$role);
1967: $userroles.='user.role.'.$trole.'.'.$area.'='.
1968: $tstart.'.'.$tend."\n";
1969: # log the associated role with the area
1970: &userrolelog($trole,$username,$domain,$area,$tstart,$tend);
1971: if ($tend!=0) {
1972: if ($tend<$now) {
1973: $trole='';
1974: }
1975: }
1976: if ($tstart!=0) {
1977: if ($tstart>$now) {
1978: $trole='';
1979: }
1980: }
1981: if (($area ne '') && ($trole ne '')) {
1982: my $spec=$trole.'.'.$area;
1983: my ($tdummy,$tdomain,$trest)=split(/\//,$area);
1984: if ($trole =~ /^cr\//) {
1985: my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
1986: my $homsvr=homeserver($rauthor,$rdomain);
1987: if ($hostname{$homsvr} ne '') {
1988: my ($rdummy,$roledef)=
1989: &get('roles',["rolesdef_$rrole"],$rdomain,$rauthor);
1990:
1991: if (($rdummy ne 'con_lost') && ($roledef ne '')) {
1992: my ($syspriv,$dompriv,$coursepriv)=
1993: split(/\_/,$roledef);
1994: if (defined($syspriv)) {
1995: $allroles{'cm./'}.=':'.$syspriv;
1996: $allroles{$spec.'./'}.=':'.$syspriv;
1997: }
1998: if ($tdomain ne '') {
1999: if (defined($dompriv)) {
2000: $allroles{'cm./'.$tdomain.'/'}.=':'.$dompriv;
2001: $allroles{$spec.'./'.$tdomain.'/'}.=':'.$dompriv;
2002: }
2003: if ($trest ne '') {
2004: if (defined($coursepriv)) {
2005: $allroles{'cm.'.$area}.=':'.$coursepriv;
2006: $allroles{$spec.'.'.$area}.=':'.$coursepriv;
2007: }
2008: }
2009: }
2010: }
2011: }
2012: } else {
2013: if (defined($pr{$trole.':s'})) {
2014: $allroles{'cm./'}.=':'.$pr{$trole.':s'};
2015: $allroles{$spec.'./'}.=':'.$pr{$trole.':s'};
2016: }
2017: if ($tdomain ne '') {
2018: if (defined($pr{$trole.':d'})) {
2019: $allroles{'cm./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
2020: $allroles{$spec.'./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
2021: }
2022: if ($trest ne '') {
2023: if (defined($pr{$trole.':c'})) {
2024: $allroles{'cm.'.$area}.=':'.$pr{$trole.':c'};
2025: $allroles{$spec.'.'.$area}.=':'.$pr{$trole.':c'};
2026: }
2027: }
2028: }
2029: }
2030: }
2031: }
2032: }
2033: my $adv=0;
2034: my $author=0;
2035: foreach (keys %allroles) {
2036: %thesepriv=();
2037: if (($_!~/^st/) && ($_!~/^ta/) && ($_!~/^cm/)) { $adv=1; }
2038: if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }
2039: foreach (split(/:/,$allroles{$_})) {
2040: if ($_ ne '') {
2041: my ($privilege,$restrictions)=split(/&/,$_);
2042: if ($restrictions eq '') {
2043: $thesepriv{$privilege}='F';
2044: } else {
2045: if ($thesepriv{$privilege} ne 'F') {
2046: $thesepriv{$privilege}.=$restrictions;
2047: }
2048: }
2049: }
2050: }
2051: $thesestr='';
2052: foreach (keys %thesepriv) { $thesestr.=':'.$_.'&'.$thesepriv{$_}; }
2053: $userroles.='user.priv.'.$_.'='.$thesestr."\n";
2054: }
2055: $userroles.='user.adv='.$adv."\n".
2056: 'user.author='.$author."\n";
2057: $ENV{'user.adv'}=$adv;
2058: }
2059: return $userroles;
2060: }
2061:
2062: # --------------------------------------------------------------- get interface
2063:
2064: sub get {
2065: my ($namespace,$storearr,$udomain,$uname)=@_;
2066: my $items='';
2067: foreach (@$storearr) {
2068: $items.=escape($_).'&';
2069: }
2070: $items=~s/\&$//;
2071: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
2072: if (!$uname) { $uname=$ENV{'user.name'}; }
2073: my $uhome=&homeserver($uname,$udomain);
2074:
2075: my $rep=&reply("get:$udomain:$uname:$namespace:$items",$uhome);
2076: my @pairs=split(/\&/,$rep);
2077: if ( $#pairs==0 && $pairs[0] =~ /^(con_lost|error|no_such_host)/i) {
2078: return @pairs;
2079: }
2080: my %returnhash=();
2081: my $i=0;
2082: foreach (@$storearr) {
2083: $returnhash{$_}=unescape($pairs[$i]);
2084: $i++;
2085: }
2086: return %returnhash;
2087: }
2088:
2089: # --------------------------------------------------------------- del interface
2090:
2091: sub del {
2092: my ($namespace,$storearr,$udomain,$uname)=@_;
2093: my $items='';
2094: foreach (@$storearr) {
2095: $items.=escape($_).'&';
2096: }
2097: $items=~s/\&$//;
2098: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
2099: if (!$uname) { $uname=$ENV{'user.name'}; }
2100: my $uhome=&homeserver($uname,$udomain);
2101:
2102: return &reply("del:$udomain:$uname:$namespace:$items",$uhome);
2103: }
2104:
2105: # -------------------------------------------------------------- dump interface
2106:
2107: sub dump {
2108: my ($namespace,$udomain,$uname,$regexp)=@_;
2109: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
2110: if (!$uname) { $uname=$ENV{'user.name'}; }
2111: my $uhome=&homeserver($uname,$udomain);
2112: if ($regexp) {
2113: $regexp=&escape($regexp);
2114: } else {
2115: $regexp='.';
2116: }
2117: my $rep=reply("dump:$udomain:$uname:$namespace:$regexp",$uhome);
2118: my @pairs=split(/\&/,$rep);
2119: my %returnhash=();
2120: foreach (@pairs) {
2121: my ($key,$value)=split(/=/,$_);
2122: $returnhash{unescape($key)}=unescape($value);
2123: }
2124: return %returnhash;
2125: }
2126:
2127: # --------------------------------------------------------------- currentdump
2128: sub currentdump {
2129: my ($courseid,$sdom,$sname)=@_;
2130: $courseid = $ENV{'request.course.id'} if (! defined($courseid));
2131: $sdom = $ENV{'user.domain'} if (! defined($sdom));
2132: $sname = $ENV{'user.name'} if (! defined($sname));
2133: my $uhome = &homeserver($sname,$sdom);
2134: my $rep=reply('currentdump:'.$sdom.':'.$sname.':'.$courseid,$uhome);
2135: return if ($rep =~ /^(error:|no_such_host)/);
2136: #
2137: my %returnhash=();
2138: #
2139: if ($rep eq "unknown_cmd") {
2140: # an old lond will not know currentdump
2141: # Do a dump and make it look like a currentdump
2142: my @tmp = &dump($courseid,$sdom,$sname,'.');
2143: return if ($tmp[0] =~ /^(error:|no_such_host)/);
2144: my %hash = @tmp;
2145: @tmp=();
2146: # Code ripped from lond, essentially. The only difference
2147: # here is the unescaping done by lonnet::dump(). Conceivably
2148: # we might run in to problems with parameter names =~ /^v\./
2149: while (my ($key,$value) = each(%hash)) {
2150: my ($v,$symb,$param) = split(/:/,$key);
2151: next if ($v eq 'version' || $symb eq 'keys');
2152: next if (exists($returnhash{$symb}) &&
2153: exists($returnhash{$symb}->{$param}) &&
2154: $returnhash{$symb}->{'v.'.$param} > $v);
2155: $returnhash{$symb}->{$param}=$value;
2156: $returnhash{$symb}->{'v.'.$param}=$v;
2157: }
2158: #
2159: # Remove all of the keys in the hashes which keep track of
2160: # the version of the parameter.
2161: while (my ($symb,$param_hash) = each(%returnhash)) {
2162: # use a foreach because we are going to delete from the hash.
2163: foreach my $key (keys(%$param_hash)) {
2164: delete($param_hash->{$key}) if ($key =~ /^v\./);
2165: }
2166: }
2167: } else {
2168: my @pairs=split(/\&/,$rep);
2169: foreach (@pairs) {
2170: my ($key,$value)=split(/=/,$_);
2171: my ($symb,$param) = split(/:/,$key);
2172: $returnhash{&unescape($symb)}->{&unescape($param)} =
2173: &unescape($value);
2174: }
2175: }
2176: return %returnhash;
2177: }
2178:
2179: # --------------------------------------------------------------- put interface
2180:
2181: sub put {
2182: my ($namespace,$storehash,$udomain,$uname)=@_;
2183: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
2184: if (!$uname) { $uname=$ENV{'user.name'}; }
2185: my $uhome=&homeserver($uname,$udomain);
2186: my $items='';
2187: foreach (keys %$storehash) {
2188: $items.=&escape($_).'='.&escape($$storehash{$_}).'&';
2189: }
2190: $items=~s/\&$//;
2191: return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
2192: }
2193:
2194: # ------------------------------------------------------ critical put interface
2195:
2196: sub cput {
2197: my ($namespace,$storehash,$udomain,$uname)=@_;
2198: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
2199: if (!$uname) { $uname=$ENV{'user.name'}; }
2200: my $uhome=&homeserver($uname,$udomain);
2201: my $items='';
2202: foreach (keys %$storehash) {
2203: $items.=escape($_).'='.escape($$storehash{$_}).'&';
2204: }
2205: $items=~s/\&$//;
2206: return &critical("put:$udomain:$uname:$namespace:$items",$uhome);
2207: }
2208:
2209: # -------------------------------------------------------------- eget interface
2210:
2211: sub eget {
2212: my ($namespace,$storearr,$udomain,$uname)=@_;
2213: my $items='';
2214: foreach (@$storearr) {
2215: $items.=escape($_).'&';
2216: }
2217: $items=~s/\&$//;
2218: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
2219: if (!$uname) { $uname=$ENV{'user.name'}; }
2220: my $uhome=&homeserver($uname,$udomain);
2221: my $rep=&reply("eget:$udomain:$uname:$namespace:$items",$uhome);
2222: my @pairs=split(/\&/,$rep);
2223: my %returnhash=();
2224: my $i=0;
2225: foreach (@$storearr) {
2226: $returnhash{$_}=unescape($pairs[$i]);
2227: $i++;
2228: }
2229: return %returnhash;
2230: }
2231:
2232: # ---------------------------------------------- Custom access rule evaluation
2233:
2234: sub customaccess {
2235: my ($priv,$uri)=@_;
2236: my ($urole,$urealm)=split(/\./,$ENV{'request.role'});
2237: $urealm=~s/^\W//;
2238: my ($udom,$ucrs,$usec)=split(/\//,$urealm);
2239: my $access=0;
2240: foreach (split(/\s*\,\s*/,&metadata($uri,'rule_rights'))) {
2241: my ($effect,$realm,$role)=split(/\:/,$_);
2242: if ($role) {
2243: if ($role ne $urole) { next; }
2244: }
2245: foreach (split(/\s*\,\s*/,$realm)) {
2246: my ($tdom,$tcrs,$tsec)=split(/\_/,$_);
2247: if ($tdom) {
2248: if ($tdom ne $udom) { next; }
2249: }
2250: if ($tcrs) {
2251: if ($tcrs ne $ucrs) { next; }
2252: }
2253: if ($tsec) {
2254: if ($tsec ne $usec) { next; }
2255: }
2256: $access=($effect eq 'allow');
2257: last;
2258: }
2259: }
2260: return $access;
2261: }
2262:
2263: # ------------------------------------------------- Check for a user privilege
2264:
2265: sub allowed {
2266: my ($priv,$uri)=@_;
2267:
2268: my $orguri=$uri;
2269: $uri=&declutter($uri);
2270:
2271: if (defined($ENV{'allowed.'.$priv})) { return $ENV{'allowed.'.$priv}; }
2272: # Free bre access to adm and meta resources
2273:
2274: if ((($uri=~/^adm\//) || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {
2275: return 'F';
2276: }
2277:
2278: # Free bre to public access
2279:
2280: if ($priv eq 'bre') {
2281: my $copyright=&metadata($uri,'copyright');
2282: if (($copyright eq 'public') && (!$ENV{'request.course.id'})) {
2283: return 'F';
2284: }
2285: if ($copyright eq 'priv') {
2286: $uri=~/([^\/]+)\/([^\/]+)\//;
2287: unless (($ENV{'user.name'} eq $2) && ($ENV{'user.domain'} eq $1)) {
2288: return '';
2289: }
2290: }
2291: if ($copyright eq 'domain') {
2292: $uri=~/([^\/]+)\/([^\/]+)\//;
2293: unless (($ENV{'user.domain'} eq $1) ||
2294: ($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $1)) {
2295: return '';
2296: }
2297: }
2298: if ($ENV{'request.role'}=~ /li\.\//) {
2299: # Library role, so allow browsing of resources in this domain.
2300: return 'F';
2301: }
2302: if ($copyright eq 'custom') {
2303: unless (&customaccess($priv,$uri)) { return ''; }
2304: }
2305: }
2306: # Domain coordinator is trying to create a course
2307: if (($priv eq 'ccc') && ($ENV{'request.role'} =~ /^dc\./)) {
2308: # uri is the requested domain in this case.
2309: # comparison to 'request.role.domain' shows if the user has selected
2310: # a role of dc for the domain in question.
2311: return 'F' if ($uri eq $ENV{'request.role.domain'});
2312: }
2313:
2314: my $thisallowed='';
2315: my $statecond=0;
2316: my $courseprivid='';
2317:
2318: # Course
2319:
2320: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'}=~/$priv\&([^\:]*)/) {
2321: $thisallowed.=$1;
2322: }
2323:
2324: # Domain
2325:
2326: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
2327: =~/$priv\&([^\:]*)/) {
2328: $thisallowed.=$1;
2329: }
2330:
2331: # Course: uri itself is a course
2332: my $courseuri=$uri;
2333: $courseuri=~s/\_(\d)/\/$1/;
2334: $courseuri=~s/^([^\/])/\/$1/;
2335:
2336: if ($ENV{'user.priv.'.$ENV{'request.role'}.'.'.$courseuri}
2337: =~/$priv\&([^\:]*)/) {
2338: $thisallowed.=$1;
2339: }
2340:
2341: # URI is an uploaded document for this course
2342:
2343: if (($priv eq 'bre') &&
2344: ($uri=~/^uploaded\/$ENV{'course.'.$ENV{'request.course.id'}.'.domain'}\/$ENV{'course.'.$ENV{'request.course.id'}.'.num'}/)) {
2345: return 'F';
2346: }
2347: # Full access at system, domain or course-wide level? Exit.
2348:
2349: if ($thisallowed=~/F/) {
2350: return 'F';
2351: }
2352:
2353: # If this is generating or modifying users, exit with special codes
2354:
2355: if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:cca:'=~/\:$priv\:/) {
2356: return $thisallowed;
2357: }
2358: #
2359: # Gathered so far: system, domain and course wide privileges
2360: #
2361: # Course: See if uri or referer is an individual resource that is part of
2362: # the course
2363:
2364: if ($ENV{'request.course.id'}) {
2365:
2366: $courseprivid=$ENV{'request.course.id'};
2367: if ($ENV{'request.course.sec'}) {
2368: $courseprivid.='/'.$ENV{'request.course.sec'};
2369: }
2370: $courseprivid=~s/\_/\//;
2371: my $checkreferer=1;
2372: my ($match,$cond)=&is_on_map($uri);
2373: if ($match) {
2374: $statecond=$cond;
2375: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
2376: =~/$priv\&([^\:]*)/) {
2377: $thisallowed.=$1;
2378: $checkreferer=0;
2379: }
2380: }
2381:
2382: if ($checkreferer) {
2383: my $refuri=$ENV{'httpref.'.$orguri};
2384: unless ($refuri) {
2385: foreach (keys %ENV) {
2386: if ($_=~/^httpref\..*\*/) {
2387: my $pattern=$_;
2388: $pattern=~s/^httpref\.\/res\///;
2389: $pattern=~s/\*/\[\^\/\]\+/g;
2390: $pattern=~s/\//\\\//g;
2391: if ($orguri=~/$pattern/) {
2392: $refuri=$ENV{$_};
2393: }
2394: }
2395: }
2396: }
2397:
2398: if ($refuri) {
2399: $refuri=&declutter($refuri);
2400: my ($match,$cond)=&is_on_map($refuri);
2401: if ($match) {
2402: my $refstatecond=$cond;
2403: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
2404: =~/$priv\&([^\:]*)/) {
2405: $thisallowed.=$1;
2406: $uri=$refuri;
2407: $statecond=$refstatecond;
2408: }
2409: }
2410: }
2411: }
2412: }
2413:
2414: #
2415: # Gathered now: all privileges that could apply, and condition number
2416: #
2417: #
2418: # Full or no access?
2419: #
2420:
2421: if ($thisallowed=~/F/) {
2422: return 'F';
2423: }
2424:
2425: unless ($thisallowed) {
2426: return '';
2427: }
2428:
2429: # Restrictions exist, deal with them
2430: #
2431: # C:according to course preferences
2432: # R:according to resource settings
2433: # L:unless locked
2434: # X:according to user session state
2435: #
2436:
2437: # Possibly locked functionality, check all courses
2438: # Locks might take effect only after 10 minutes cache expiration for other
2439: # courses, and 2 minutes for current course
2440:
2441: my $envkey;
2442: if ($thisallowed=~/L/) {
2443: foreach $envkey (keys %ENV) {
2444: if ($envkey=~/^user\.role\.(st|ta)\.([^\.]*)/) {
2445: my $courseid=$2;
2446: my $roleid=$1.'.'.$2;
2447: $courseid=~s/^\///;
2448: my $expiretime=600;
2449: if ($ENV{'request.role'} eq $roleid) {
2450: $expiretime=120;
2451: }
2452: my ($cdom,$cnum,$csec)=split(/\//,$courseid);
2453: my $prefix='course.'.$cdom.'_'.$cnum.'.';
2454: if ((time-$ENV{$prefix.'last_cache'})>$expiretime) {
2455: &coursedescription($courseid);
2456: }
2457: if (($ENV{$prefix.'res.'.$uri.'.lock.sections'}=~/\,$csec\,/)
2458: || ($ENV{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {
2459: if ($ENV{$prefix.'res.'.$uri.'.lock.expire'}>time) {
2460: &log($ENV{'user.domain'},$ENV{'user.name'},
2461: $ENV{'user.home'},
2462: 'Locked by res: '.$priv.' for '.$uri.' due to '.
2463: $cdom.'/'.$cnum.'/'.$csec.' expire '.
2464: $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
2465: return '';
2466: }
2467: }
2468: if (($ENV{$prefix.'priv.'.$priv.'.lock.sections'}=~/\,$csec\,/)
2469: || ($ENV{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {
2470: if ($ENV{'priv.'.$priv.'.lock.expire'}>time) {
2471: &log($ENV{'user.domain'},$ENV{'user.name'},
2472: $ENV{'user.home'},
2473: 'Locked by priv: '.$priv.' for '.$uri.' due to '.
2474: $cdom.'/'.$cnum.'/'.$csec.' expire '.
2475: $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
2476: return '';
2477: }
2478: }
2479: }
2480: }
2481: }
2482:
2483: #
2484: # Rest of the restrictions depend on selected course
2485: #
2486:
2487: unless ($ENV{'request.course.id'}) {
2488: return '1';
2489: }
2490:
2491: #
2492: # Now user is definitely in a course
2493: #
2494:
2495:
2496: # Course preferences
2497:
2498: if ($thisallowed=~/C/) {
2499: my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
2500: my $unamedom=$ENV{'user.name'}.':'.$ENV{'user.domain'};
2501: if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.roles.denied'}
2502: =~/$rolecode/) {
2503: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
2504: 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.
2505: $ENV{'request.course.id'});
2506: return '';
2507: }
2508:
2509: if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.users.denied'}
2510: =~/$unamedom/) {
2511: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
2512: 'Denied by user: '.$priv.' for '.$uri.' as '.$unamedom.' in '.
2513: $ENV{'request.course.id'});
2514: return '';
2515: }
2516: }
2517:
2518: # Resource preferences
2519:
2520: if ($thisallowed=~/R/) {
2521: my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
2522: if (&metadata($uri,'roledeny')=~/$rolecode/) {
2523: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
2524: 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);
2525: return '';
2526: }
2527: }
2528:
2529: # Restricted by state or randomout?
2530:
2531: if ($thisallowed=~/X/) {
2532: if ($ENV{'acc.randomout'}) {
2533: my $symb=&symbread($uri,1);
2534: if (($symb) && ($ENV{'acc.randomout'}=~/\&$symb\&/)) {
2535: return '';
2536: }
2537: }
2538: if (&condval($statecond)) {
2539: return '2';
2540: } else {
2541: return '';
2542: }
2543: }
2544:
2545: return 'F';
2546: }
2547:
2548: # --------------------------------------------------- Is a resource on the map?
2549:
2550: sub is_on_map {
2551: my $uri=&declutter(shift);
2552: my @uriparts=split(/\//,$uri);
2553: my $filename=$uriparts[$#uriparts];
2554: my $pathname=$uri;
2555: $pathname=~s|/\Q$filename\E$||;
2556: $pathname=~s/^adm\/wrapper\///;
2557: #Trying to find the conditional for the file
2558: my $match=($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
2559: /\&\Q$filename\E\:([\d\|]+)\&/);
2560: if ($match) {
2561: return (1,$1);
2562: } else {
2563: return (0,0);
2564: }
2565: }
2566:
2567: # ----------------------------------------------------------------- Define Role
2568:
2569: sub definerole {
2570: if (allowed('mcr','/')) {
2571: my ($rolename,$sysrole,$domrole,$courole)=@_;
2572: foreach (split(':',$sysrole)) {
2573: my ($crole,$cqual)=split(/\&/,$_);
2574: if ($pr{'cr:s'}!~/$crole/) { return "refused:s:$crole"; }
2575: if ($pr{'cr:s'}=~/$crole\&/) {
2576: if ($pr{'cr:s'}!~/$crole\&\w*$cqual/) {
2577: return "refused:s:$crole&$cqual";
2578: }
2579: }
2580: }
2581: foreach (split(':',$domrole)) {
2582: my ($crole,$cqual)=split(/\&/,$_);
2583: if ($pr{'cr:d'}!~/$crole/) { return "refused:d:$crole"; }
2584: if ($pr{'cr:d'}=~/$crole\&/) {
2585: if ($pr{'cr:d'}!~/$crole\&\w*$cqual/) {
2586: return "refused:d:$crole&$cqual";
2587: }
2588: }
2589: }
2590: foreach (split(':',$courole)) {
2591: my ($crole,$cqual)=split(/\&/,$_);
2592: if ($pr{'cr:c'}!~/$crole/) { return "refused:c:$crole"; }
2593: if ($pr{'cr:c'}=~/$crole\&/) {
2594: if ($pr{'cr:c'}!~/$crole\&\w*$cqual/) {
2595: return "refused:c:$crole&$cqual";
2596: }
2597: }
2598: }
2599: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
2600: "$ENV{'user.domain'}:$ENV{'user.name'}:".
2601: "rolesdef_$rolename=".
2602: escape($sysrole.'_'.$domrole.'_'.$courole);
2603: return reply($command,$ENV{'user.home'});
2604: } else {
2605: return 'refused';
2606: }
2607: }
2608:
2609: # ---------------- Make a metadata query against the network of library servers
2610:
2611: sub metadata_query {
2612: my ($query,$custom,$customshow,$server_array)=@_;
2613: my %rhash;
2614: my @server_list = (defined($server_array) ? @$server_array
2615: : keys(%libserv) );
2616: for my $server (@server_list) {
2617: unless ($custom or $customshow) {
2618: my $reply=&reply("querysend:".&escape($query),$server);
2619: $rhash{$server}=$reply;
2620: }
2621: else {
2622: my $reply=&reply("querysend:".&escape($query).':'.
2623: &escape($custom).':'.&escape($customshow),
2624: $server);
2625: $rhash{$server}=$reply;
2626: }
2627: }
2628: return \%rhash;
2629: }
2630:
2631: # ----------------------------------------- Send log queries and wait for reply
2632:
2633: sub log_query {
2634: my ($uname,$udom,$query,%filters)=@_;
2635: my $uhome=&homeserver($uname,$udom);
2636: if ($uhome eq 'no_host') { return 'error: no_host'; }
2637: my $uhost=$hostname{$uhome};
2638: my $command=&escape(join(':',map{$_.'='.$filters{$_}} keys %filters));
2639: my $queryid=&reply("querysend:".$query.':'.$udom.':'.$uname.':'.$command,
2640: $uhome);
2641: unless ($queryid=~/^$uhost\_/) { return 'error: '.$queryid; }
2642: return get_query_reply($queryid);
2643: }
2644:
2645: sub get_query_reply {
2646: my $queryid=shift;
2647: my $replyfile=$perlvar{'lonDaemons'}.'/tmp/'.$queryid;
2648: my $reply='';
2649: for (1..100) {
2650: sleep 2;
2651: if (-e $replyfile.'.end') {
2652: if (my $fh=Apache::File->new($replyfile)) {
2653: $reply.=<$fh>;
2654: $fh->close;
2655: } else { return 'error: reply_file_error'; }
2656: return &unescape($reply);
2657: }
2658: }
2659: return 'timeout:'.$queryid;
2660: }
2661:
2662: sub courselog_query {
2663: #
2664: # possible filters:
2665: # url: url or symb
2666: # username
2667: # domain
2668: # action: view, submit, grade
2669: # start: timestamp
2670: # end: timestamp
2671: #
2672: my (%filters)=@_;
2673: unless ($ENV{'request.course.id'}) { return 'no_course'; }
2674: if ($filters{'url'}) {
2675: $filters{'url'}=&symbclean(&declutter($filters{'url'}));
2676: $filters{'url'}=~s/\.(\w+)$/(\\.\\d+)*\\.$1/;
2677: $filters{'url'}=~s/\.(\w+)\_\_\_/(\\.\\d+)*\\.$1/;
2678: }
2679: my $cname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
2680: my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
2681: return &log_query($cname,$cdom,'courselog',%filters);
2682: }
2683:
2684: sub userlog_query {
2685: my ($uname,$udom,%filters)=@_;
2686: return &log_query($uname,$udom,'userlog',%filters);
2687: }
2688:
2689: # ------------------------------------------------------------------ Plain Text
2690:
2691: sub plaintext {
2692: my $short=shift;
2693: return $prp{$short};
2694: }
2695:
2696: # ----------------------------------------------------------------- Assign Role
2697:
2698: sub assignrole {
2699: my ($udom,$uname,$url,$role,$end,$start,$deleteflag)=@_;
2700: my $mrole;
2701: if ($role =~ /^cr\//) {
2702: my $cwosec=$url;
2703: $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
2704: unless (&allowed('ccr',$cwosec)) {
2705: &logthis('Refused custom assignrole: '.
2706: $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
2707: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
2708: return 'refused';
2709: }
2710: $mrole='cr';
2711: } else {
2712: my $cwosec=$url;
2713: $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
2714: unless ((&allowed('c'.$role,$cwosec)) || &allowed('c'.$role,$udom)) {
2715: &logthis('Refused assignrole: '.
2716: $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
2717: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
2718: return 'refused';
2719: }
2720: $mrole=$role;
2721: }
2722: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
2723: "$udom:$uname:$url".'_'."$mrole=$role";
2724: if ($end) { $command.='_'.$end; }
2725: if ($start) {
2726: if ($end) {
2727: $command.='_'.$start;
2728: } else {
2729: $command.='_0_'.$start;
2730: }
2731: }
2732: # actually delete
2733: if ($deleteflag) {
2734: if ((&allowed('dro',$udom)) || (&allowed('dro',$url))) {
2735: # modify command to delete the role
2736: $command="encrypt:rolesdel:$ENV{'user.domain'}:$ENV{'user.name'}:".
2737: "$udom:$uname:$url".'_'."$mrole";
2738: &logthis("$ENV{'user.name'} at $ENV{'user.domain'} deletes $mrole in $url for $uname at $udom");
2739: # set start and finish to negative values for userrolelog
2740: $start=-1;
2741: $end=-1;
2742: }
2743: }
2744: # send command
2745: my $answer=&reply($command,&homeserver($uname,$udom));
2746: # log new user role if status is ok
2747: if ($answer eq 'ok') {
2748: &userrolelog($mrole,$uname,$udom,$url,$start,$end);
2749: }
2750: return $answer;
2751: }
2752:
2753: # -------------------------------------------------- Modify user authentication
2754: # Overrides without validation
2755:
2756: sub modifyuserauth {
2757: my ($udom,$uname,$umode,$upass)=@_;
2758: my $uhome=&homeserver($uname,$udom);
2759: unless (&allowed('mau',$udom)) { return 'refused'; }
2760: &logthis('Call to modify user authentication '.$udom.', '.$uname.', '.
2761: $umode.' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'}.
2762: ' in domain '.$ENV{'request.role.domain'});
2763: my $reply=&reply('encrypt:changeuserauth:'.$udom.':'.$uname.':'.$umode.':'.
2764: &escape($upass),$uhome);
2765: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},
2766: 'Authentication changed for '.$udom.', '.$uname.', '.$umode.
2767: '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
2768: &log($udom,,$uname,$uhome,
2769: 'Authentication changed by '.$ENV{'user.domain'}.', '.
2770: $ENV{'user.name'}.', '.$umode.
2771: '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
2772: unless ($reply eq 'ok') {
2773: &logthis('Authentication mode error: '.$reply);
2774: return 'error: '.$reply;
2775: }
2776: return 'ok';
2777: }
2778:
2779: # --------------------------------------------------------------- Modify a user
2780:
2781: sub modifyuser {
2782: my ($udom, $uname, $uid,
2783: $umode, $upass, $first,
2784: $middle, $last, $gene,
2785: $forceid, $desiredhome, $email)=@_;
2786: $udom=~s/\W//g;
2787: $uname=~s/\W//g;
2788: &logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.
2789: $umode.', '.$first.', '.$middle.', '.
2790: $last.', '.$gene.'(forceid: '.$forceid.')'.
2791: (defined($desiredhome) ? ' desiredhome = '.$desiredhome :
2792: ' desiredhome not specified').
2793: ' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'}.
2794: ' in domain '.$ENV{'request.role.domain'});
2795: my $uhome=&homeserver($uname,$udom,'true');
2796: # ----------------------------------------------------------------- Create User
2797: if (($uhome eq 'no_host') && ($umode) && ($upass)) {
2798: my $unhome='';
2799: if (defined($desiredhome) && $hostdom{$desiredhome} eq $udom) {
2800: $unhome = $desiredhome;
2801: } elsif($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $udom) {
2802: $unhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
2803: } else { # load balancing routine for determining $unhome
2804: my $tryserver;
2805: my $loadm=10000000;
2806: foreach $tryserver (keys %libserv) {
2807: if ($hostdom{$tryserver} eq $udom) {
2808: my $answer=reply('load',$tryserver);
2809: if (($answer=~/\d+/) && ($answer<$loadm)) {
2810: $loadm=$answer;
2811: $unhome=$tryserver;
2812: }
2813: }
2814: }
2815: }
2816: if (($unhome eq '') || ($unhome eq 'no_host')) {
2817: return 'error: unable to find a home server for '.$uname.
2818: ' in domain '.$udom;
2819: }
2820: my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':'.$umode.':'.
2821: &escape($upass),$unhome);
2822: unless ($reply eq 'ok') {
2823: return 'error: '.$reply;
2824: }
2825: $uhome=&homeserver($uname,$udom,'true');
2826: if (($uhome eq '') || ($uhome eq 'no_host') || ($uhome ne $unhome)) {
2827: return 'error: unable verify users home machine.';
2828: }
2829: } # End of creation of new user
2830: # ---------------------------------------------------------------------- Add ID
2831: if ($uid) {
2832: $uid=~tr/A-Z/a-z/;
2833: my %uidhash=&idrget($udom,$uname);
2834: if (($uidhash{$uname}) && ($uidhash{$uname}!~/error\:/)
2835: && (!$forceid)) {
2836: unless ($uid eq $uidhash{$uname}) {
2837: return 'error: user id "'.$uid.'" does not match '.
2838: 'current user id "'.$uidhash{$uname}.'".';
2839: }
2840: } else {
2841: &idput($udom,($uname => $uid));
2842: }
2843: }
2844: # -------------------------------------------------------------- Add names, etc
2845: my @tmp=&get('environment',
2846: ['firstname','middlename','lastname','generation'],
2847: $udom,$uname);
2848: my %names;
2849: if ($tmp[0] =~ m/^error:.*/) {
2850: %names=();
2851: } else {
2852: %names = @tmp;
2853: }
2854: #
2855: # Make sure to not trash student environment if instructor does not bother
2856: # to supply name and email information
2857: #
2858: if ($first) { $names{'firstname'} = $first; }
2859: if (defined($middle)) { $names{'middlename'} = $middle; }
2860: if ($last) { $names{'lastname'} = $last; }
2861: if (defined($gene)) { $names{'generation'} = $gene; }
2862: if ($email) { $names{'notification'} = $email;
2863: $names{'critnotification'} = $email; }
2864:
2865: my $reply = &put('environment', \%names, $udom,$uname);
2866: if ($reply ne 'ok') { return 'error: '.$reply; }
2867: &logthis('Success modifying user '.$udom.', '.$uname.', '.$uid.', '.
2868: $umode.', '.$first.', '.$middle.', '.
2869: $last.', '.$gene.' by '.
2870: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
2871: return 'ok';
2872: }
2873:
2874: # -------------------------------------------------------------- Modify student
2875:
2876: sub modifystudent {
2877: my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,
2878: $end,$start,$forceid,$desiredhome,$email)=@_;
2879: my $cid='';
2880: unless ($cid=$ENV{'request.course.id'}) {
2881: return 'not_in_class';
2882: }
2883: # --------------------------------------------------------------- Make the user
2884: my $reply=&modifyuser
2885: ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$forceid,
2886: $desiredhome,$email);
2887: unless ($reply eq 'ok') { return $reply; }
2888: # This will cause &modify_student_enrollment to get the uid from the
2889: # students environment
2890: $uid = undef if (!$forceid);
2891: $reply = &modify_student_enrollment($udom,$uname,$uid,$first,$middle,
2892: $last,$gene,$usec,$end,$start);
2893: return $reply;
2894: }
2895:
2896: sub modify_student_enrollment {
2897: my ($udom,$uname,$uid,$first,$middle,$last,$gene,$usec,$end,$start) = @_;
2898: # Get the course id from the environment
2899: my $cid='';
2900: unless ($cid=$ENV{'request.course.id'}) {
2901: return 'not_in_class';
2902: }
2903: # Make sure the user exists
2904: my $uhome=&homeserver($uname,$udom);
2905: if (($uhome eq '') || ($uhome eq 'no_host')) {
2906: return 'error: no such user';
2907: }
2908: #
2909: # Get student data if we were not given enough information
2910: if (!defined($first) || $first eq '' ||
2911: !defined($last) || $last eq '' ||
2912: !defined($uid) || $uid eq '' ||
2913: !defined($middle) || $middle eq '' ||
2914: !defined($gene) || $gene eq '') {
2915: # They did not supply us with enough data to enroll the student, so
2916: # we need to pick up more information.
2917: my %tmp = &get('environment',
2918: ['firstname','middlename','lastname', 'generation','id']
2919: ,$udom,$uname);
2920:
2921: foreach (keys(%tmp)) {
2922: &logthis("key $_ = ".$tmp{$_});
2923: }
2924: $first = $tmp{'firstname'} if (!defined($first) || $first eq '');
2925: $middle = $tmp{'middlename'} if (!defined($middle) || $middle eq '');
2926: $last = $tmp{'lastname'} if (!defined($last) || $last eq '');
2927: $gene = $tmp{'generation'} if (!defined($gene) || $gene eq '');
2928: $uid = $tmp{'id'} if (!defined($uid) || $uid eq '');
2929: }
2930: my $fullname = &Apache::loncoursedata::ProcessFullName($last,$gene,
2931: $first,$middle);
2932: my $reply=critical('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
2933: $ENV{'course.'.$cid.'.num'}.':classlist:'.
2934: &escape($uname.':'.$udom).'='.
2935: &escape(join(':',$end,$start,$uid,$usec,$fullname)),
2936: $ENV{'course.'.$cid.'.home'});
2937: unless (($reply eq 'ok') || ($reply eq 'delayed')) {
2938: return 'error: '.$reply;
2939: }
2940: # Add student role to user
2941: my $uurl='/'.$cid;
2942: $uurl=~s/\_/\//g;
2943: if ($usec) {
2944: $uurl.='/'.$usec;
2945: }
2946: return &assignrole($udom,$uname,$uurl,'st',$end,$start);
2947: }
2948:
2949: # ------------------------------------------------- Write to course preferences
2950:
2951: sub writecoursepref {
2952: my ($courseid,%prefs)=@_;
2953: $courseid=~s/^\///;
2954: $courseid=~s/\_/\//g;
2955: my ($cdomain,$cnum)=split(/\//,$courseid);
2956: my $chome=homeserver($cnum,$cdomain);
2957: if (($chome eq '') || ($chome eq 'no_host')) {
2958: return 'error: no such course';
2959: }
2960: my $cstring='';
2961: foreach (keys %prefs) {
2962: $cstring.=escape($_).'='.escape($prefs{$_}).'&';
2963: }
2964: $cstring=~s/\&$//;
2965: return reply('put:'.$cdomain.':'.$cnum.':environment:'.$cstring,$chome);
2966: }
2967:
2968: # ---------------------------------------------------------- Make/modify course
2969:
2970: sub createcourse {
2971: my ($udom,$description,$url,$course_server,$nonstandard)=@_;
2972: $url=&declutter($url);
2973: my $cid='';
2974: unless (&allowed('ccc',$udom)) {
2975: return 'refused';
2976: }
2977: # ------------------------------------------------------------------- Create ID
2978: my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
2979: unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
2980: # ----------------------------------------------- Make sure that does not exist
2981: my $uhome=&homeserver($uname,$udom,'true');
2982: unless (($uhome eq '') || ($uhome eq 'no_host')) {
2983: $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
2984: unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
2985: $uhome=&homeserver($uname,$udom,'true');
2986: unless (($uhome eq '') || ($uhome eq 'no_host')) {
2987: return 'error: unable to generate unique course-ID';
2988: }
2989: }
2990: # ------------------------------------------------ Check supplied server name
2991: $course_server = $ENV{'user.homeserver'} if (! defined($course_server));
2992: if (! exists($libserv{$course_server})) {
2993: return 'error:bad server name '.$course_server;
2994: }
2995: # ------------------------------------------------------------- Make the course
2996: my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
2997: $course_server);
2998: unless ($reply eq 'ok') { return 'error: '.$reply; }
2999: $uhome=&homeserver($uname,$udom,'true');
3000: if (($uhome eq '') || ($uhome eq 'no_host')) {
3001: return 'error: no such course';
3002: }
3003: # ----------------------------------------------------------------- Course made
3004: # log existance
3005: &courseidput($udom,&escape($udom.'_'.$uname).'='.&escape($description),
3006: $uhome);
3007: &flushcourselogs();
3008: # set toplevel url
3009: my $topurl=$url;
3010: unless ($nonstandard) {
3011: # ------------------------------------------ For standard courses, make top url
3012: my $mapurl=&clutter($url);
3013: if ($mapurl eq '/res/') { $mapurl=''; }
3014: $ENV{'form.initmap'}=(<<ENDINITMAP);
3015: <map>
3016: <resource id="1" type="start"></resource>
3017: <resource id="2" src="$mapurl"></resource>
3018: <resource id="3" type="finish"></resource>
3019: <link index="1" from="1" to="2"></link>
3020: <link index="2" from="2" to="3"></link>
3021: </map>
3022: ENDINITMAP
3023: $topurl=&declutter(
3024: &finishuserfileupload($uname,$udom,$uhome,'initmap','default.sequence')
3025: );
3026: }
3027: # ----------------------------------------------------------- Write preferences
3028: &writecoursepref($udom.'_'.$uname,
3029: ('description' => $description,
3030: 'url' => $topurl));
3031: return '/'.$udom.'/'.$uname;
3032: }
3033:
3034: # ---------------------------------------------------------- Assign Custom Role
3035:
3036: sub assigncustomrole {
3037: my ($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start,$deleteflag)=@_;
3038: return &assignrole($udom,$uname,$url,'cr/'.$rdom.'/'.$rnam.'/'.$rolename,
3039: $end,$start,$deleteflag);
3040: }
3041:
3042: # ----------------------------------------------------------------- Revoke Role
3043:
3044: sub revokerole {
3045: my ($udom,$uname,$url,$role,$deleteflag)=@_;
3046: my $now=time;
3047: return &assignrole($udom,$uname,$url,$role,$now,$deleteflag);
3048: }
3049:
3050: # ---------------------------------------------------------- Revoke Custom Role
3051:
3052: sub revokecustomrole {
3053: my ($udom,$uname,$url,$rdom,$rnam,$rolename,$deleteflag)=@_;
3054: my $now=time;
3055: return &assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$now,
3056: $deleteflag);
3057: }
3058:
3059: # ------------------------------------------------------------ Directory lister
3060:
3061: sub dirlist {
3062: my ($uri,$userdomain,$username,$alternateDirectoryRoot)=@_;
3063:
3064: $uri=~s/^\///;
3065: $uri=~s/\/$//;
3066: my ($udom, $uname);
3067: (undef,$udom,$uname)=split(/\//,$uri);
3068: if(defined($userdomain)) {
3069: $udom = $userdomain;
3070: }
3071: if(defined($username)) {
3072: $uname = $username;
3073: }
3074:
3075: my $dirRoot = $perlvar{'lonDocRoot'};
3076: if(defined($alternateDirectoryRoot)) {
3077: $dirRoot = $alternateDirectoryRoot;
3078: $dirRoot =~ s/\/$//;
3079: }
3080:
3081: if($udom) {
3082: if($uname) {
3083: my $listing=reply('ls:'.$dirRoot.'/'.$uri,
3084: homeserver($uname,$udom));
3085: return split(/:/,$listing);
3086: } elsif(!defined($alternateDirectoryRoot)) {
3087: my $tryserver;
3088: my %allusers=();
3089: foreach $tryserver (keys %libserv) {
3090: if($hostdom{$tryserver} eq $udom) {
3091: my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.
3092: $udom, $tryserver);
3093: if (($listing ne 'no_such_dir') && ($listing ne 'empty')
3094: && ($listing ne 'con_lost')) {
3095: foreach (split(/:/,$listing)) {
3096: my ($entry,@stat)=split(/&/,$_);
3097: $allusers{$entry}=1;
3098: }
3099: }
3100: }
3101: }
3102: my $alluserstr='';
3103: foreach (sort keys %allusers) {
3104: $alluserstr.=$_.'&user:';
3105: }
3106: $alluserstr=~s/:$//;
3107: return split(/:/,$alluserstr);
3108: } else {
3109: my @emptyResults = ();
3110: push(@emptyResults, 'missing user name');
3111: return split(':',@emptyResults);
3112: }
3113: } elsif(!defined($alternateDirectoryRoot)) {
3114: my $tryserver;
3115: my %alldom=();
3116: foreach $tryserver (keys %libserv) {
3117: $alldom{$hostdom{$tryserver}}=1;
3118: }
3119: my $alldomstr='';
3120: foreach (sort keys %alldom) {
3121: $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'/&domain:';
3122: }
3123: $alldomstr=~s/:$//;
3124: return split(/:/,$alldomstr);
3125: } else {
3126: my @emptyResults = ();
3127: push(@emptyResults, 'missing domain');
3128: return split(':',@emptyResults);
3129: }
3130: }
3131:
3132: # --------------------------------------------- GetFileTimestamp
3133: # This function utilizes dirlist and returns the date stamp for
3134: # when it was last modified. It will also return an error of -1
3135: # if an error occurs
3136:
3137: sub GetFileTimestamp {
3138: my ($studentDomain,$studentName,$filename,$root)=@_;
3139: $studentDomain=~s/\W//g;
3140: $studentName=~s/\W//g;
3141: my $subdir=$studentName.'__';
3142: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
3143: my $proname="$studentDomain/$subdir/$studentName";
3144: $proname .= '/'.$filename;
3145: my ($fileStat) = &Apache::lonnet::dirlist($proname, $studentDomain,
3146: $studentName, $root);
3147: my @stats = split('&', $fileStat);
3148: if($stats[0] ne 'empty' && $stats[0] ne 'no_such_dir') {
3149: # @stats contains first the filename, then the stat output
3150: return $stats[10]; # so this is 10 instead of 9.
3151: } else {
3152: return -1;
3153: }
3154: }
3155:
3156: # -------------------------------------------------------- Value of a Condition
3157:
3158: sub directcondval {
3159: my $number=shift;
3160: if ($ENV{'user.state.'.$ENV{'request.course.id'}}) {
3161: return substr($ENV{'user.state.'.$ENV{'request.course.id'}},$number,1);
3162: } else {
3163: return 2;
3164: }
3165: }
3166:
3167: sub condval {
3168: my $condidx=shift;
3169: my $result=0;
3170: my $allpathcond='';
3171: foreach (split(/\|/,$condidx)) {
3172: if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_})) {
3173: $allpathcond.=
3174: '('.$ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_}.')|';
3175: }
3176: }
3177: $allpathcond=~s/\|$//;
3178: if ($ENV{'request.course.id'}) {
3179: if ($allpathcond) {
3180: my $operand='|';
3181: my @stack;
3182: foreach ($allpathcond=~/(\d+|\(|\)|\&|\|)/g) {
3183: if ($_ eq '(') {
3184: push @stack,($operand,$result)
3185: } elsif ($_ eq ')') {
3186: my $before=pop @stack;
3187: if (pop @stack eq '&') {
3188: $result=$result>$before?$before:$result;
3189: } else {
3190: $result=$result>$before?$result:$before;
3191: }
3192: } elsif (($_ eq '&') || ($_ eq '|')) {
3193: $operand=$_;
3194: } else {
3195: my $new=directcondval($_);
3196: if ($operand eq '&') {
3197: $result=$result>$new?$new:$result;
3198: } else {
3199: $result=$result>$new?$result:$new;
3200: }
3201: }
3202: }
3203: }
3204: }
3205: return $result;
3206: }
3207:
3208: # ---------------------------------------------------- Devalidate courseresdata
3209:
3210: sub devalidatecourseresdata {
3211: my ($coursenum,$coursedomain)=@_;
3212: my $hashid=$coursenum.':'.$coursedomain;
3213: delete $courseresdatacache{$hashid.'.time'};
3214: }
3215:
3216: # --------------------------------------------------- Course Resourcedata Query
3217:
3218: sub courseresdata {
3219: my ($coursenum,$coursedomain,@which)=@_;
3220: my $coursehom=&homeserver($coursenum,$coursedomain);
3221: my $hashid=$coursenum.':'.$coursedomain;
3222: my $dodump=0;
3223: if (!defined($courseresdatacache{$hashid.'.time'})) {
3224: $dodump=1;
3225: } else {
3226: if (time-$courseresdatacache{$hashid.'.time'}>300) { $dodump=1; }
3227: }
3228: if ($dodump) {
3229: my %dumpreply=&dump('resourcedata',$coursedomain,$coursenum);
3230: my ($tmp) = keys(%dumpreply);
3231: if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
3232: $courseresdatacache{$hashid.'.time'}=time;
3233: $courseresdatacache{$hashid}=\%dumpreply;
3234: } elsif ($tmp =~ /^(con_lost|no_such_host)/) {
3235: return $tmp;
3236: }
3237: }
3238: foreach my $item (@which) {
3239: if (defined($courseresdatacache{$hashid}->{$item})) {
3240: return $courseresdatacache{$hashid}->{$item};
3241: }
3242: }
3243: return undef;
3244: }
3245:
3246: #
3247: # EXT resource caching routines
3248: #
3249:
3250: sub clear_EXT_cache_status {
3251: &delenv('cache.EXT.');
3252: }
3253:
3254: sub EXT_cache_status {
3255: my ($target_domain,$target_user) = @_;
3256: my $cachename = 'cache.EXT.'.$target_user.'.'.$target_domain;
3257: if (exists($ENV{$cachename}) && ($ENV{$cachename}+600) > time) {
3258: # We know already the user has no data
3259: return 1;
3260: } else {
3261: return 0;
3262: }
3263: }
3264:
3265: sub EXT_cache_set {
3266: my ($target_domain,$target_user) = @_;
3267: my $cachename = 'cache.EXT.'.$target_user.'.'.$target_domain;
3268: &appenv($cachename => time);
3269: }
3270:
3271: # --------------------------------------------------------- Value of a Variable
3272: sub EXT {
3273: my ($varname,$symbparm,$udom,$uname,$usection,$recurse)=@_;
3274:
3275: unless ($varname) { return ''; }
3276: #get real user name/domain, courseid and symb
3277: my $courseid;
3278: my $publicuser;
3279: if (!($uname && $udom)) {
3280: (my $cursymb,$courseid,$udom,$uname,$publicuser)=
3281: &Apache::lonxml::whichuser($symbparm);
3282: if (!$symbparm) { $symbparm=$cursymb; }
3283: } else {
3284: $courseid=$ENV{'request.course.id'};
3285: }
3286: my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
3287: my $rest;
3288: if (defined($therest[0])) {
3289: $rest=join('.',@therest);
3290: } else {
3291: $rest='';
3292: }
3293:
3294: my $qualifierrest=$qualifier;
3295: if ($rest) { $qualifierrest.='.'.$rest; }
3296: my $spacequalifierrest=$space;
3297: if ($qualifierrest) { $spacequalifierrest.='.'.$qualifierrest; }
3298: if ($realm eq 'user') {
3299: # --------------------------------------------------------------- user.resource
3300: if ($space eq 'resource') {
3301: if (defined($Apache::lonhomework::parsing_a_problem)) {
3302: return $Apache::lonhomework::history{$qualifierrest};
3303: } else {
3304: my %restored;
3305: if ($publicuser || $ENV{'request.state'} eq 'construct') {
3306: %restored=&tmprestore($symbparm,$courseid,$udom,$uname);
3307: } else {
3308: %restored=&restore($symbparm,$courseid,$udom,$uname);
3309: }
3310: return $restored{$qualifierrest};
3311: }
3312: # ----------------------------------------------------------------- user.access
3313: } elsif ($space eq 'access') {
3314: # FIXME - not supporting calls for a specific user
3315: return &allowed($qualifier,$rest);
3316: # ------------------------------------------ user.preferences, user.environment
3317: } elsif (($space eq 'preferences') || ($space eq 'environment')) {
3318: if (($uname eq $ENV{'user.name'}) &&
3319: ($udom eq $ENV{'user.domain'})) {
3320: return $ENV{join('.',('environment',$qualifierrest))};
3321: } else {
3322: my %returnhash;
3323: if (!$publicuser) {
3324: %returnhash=&userenvironment($udom,$uname,
3325: $qualifierrest);
3326: }
3327: return $returnhash{$qualifierrest};
3328: }
3329: # ----------------------------------------------------------------- user.course
3330: } elsif ($space eq 'course') {
3331: # FIXME - not supporting calls for a specific user
3332: return $ENV{join('.',('request.course',$qualifier))};
3333: # ------------------------------------------------------------------- user.role
3334: } elsif ($space eq 'role') {
3335: # FIXME - not supporting calls for a specific user
3336: my ($role,$where)=split(/\./,$ENV{'request.role'});
3337: if ($qualifier eq 'value') {
3338: return $role;
3339: } elsif ($qualifier eq 'extent') {
3340: return $where;
3341: }
3342: # ----------------------------------------------------------------- user.domain
3343: } elsif ($space eq 'domain') {
3344: return $udom;
3345: # ------------------------------------------------------------------- user.name
3346: } elsif ($space eq 'name') {
3347: return $uname;
3348: # ---------------------------------------------------- Any other user namespace
3349: } else {
3350: my %reply;
3351: if (!$publicuser) {
3352: %reply=&get($space,[$qualifierrest],$udom,$uname);
3353: }
3354: return $reply{$qualifierrest};
3355: }
3356: } elsif ($realm eq 'query') {
3357: # ---------------------------------------------- pull stuff out of query string
3358: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
3359: [$spacequalifierrest]);
3360: return $ENV{'form.'.$spacequalifierrest};
3361: } elsif ($realm eq 'request') {
3362: # ------------------------------------------------------------- request.browser
3363: if ($space eq 'browser') {
3364: return $ENV{'browser.'.$qualifier};
3365: # ------------------------------------------------------------ request.filename
3366: } else {
3367: return $ENV{'request.'.$spacequalifierrest};
3368: }
3369: } elsif ($realm eq 'course') {
3370: # ---------------------------------------------------------- course.description
3371: return $ENV{'course.'.$courseid.'.'.$spacequalifierrest};
3372: } elsif ($realm eq 'resource') {
3373:
3374: my $section;
3375: if (defined($courseid) && $courseid eq $ENV{'request.course.id'}) {
3376:
3377: #print '<br>'.$space.' - '.$qualifier.' - '.$spacequalifierrest;
3378:
3379: # ----------------------------------------------------- Cascading lookup scheme
3380: if (!$symbparm) { $symbparm=&symbread(); }
3381: my $symbp=$symbparm;
3382: my $mapp=(split(/\_\_\_/,$symbp))[0];
3383:
3384: my $symbparm=$symbp.'.'.$spacequalifierrest;
3385: my $mapparm=$mapp.'___(all).'.$spacequalifierrest;
3386:
3387: if (($ENV{'user.name'} eq $uname) &&
3388: ($ENV{'user.domain'} eq $udom)) {
3389: $section=$ENV{'request.course.sec'};
3390: } else {
3391: if (! defined($usection)) {
3392: $section=&usection($udom,$uname,$courseid);
3393: } else {
3394: $section = $usection;
3395: }
3396: }
3397:
3398: my $seclevel=$courseid.'.['.$section.'].'.$spacequalifierrest;
3399: my $seclevelr=$courseid.'.['.$section.'].'.$symbparm;
3400: my $seclevelm=$courseid.'.['.$section.'].'.$mapparm;
3401:
3402: my $courselevel=$courseid.'.'.$spacequalifierrest;
3403: my $courselevelr=$courseid.'.'.$symbparm;
3404: my $courselevelm=$courseid.'.'.$mapparm;
3405:
3406: # ----------------------------------------------------------- first, check user
3407: #most student don\'t have any data set, check if there is some data
3408: #every thirty minutes
3409: if (! &EXT_cache_status($udom,$uname)) {
3410: my %resourcedata=&get('resourcedata',
3411: [$courselevelr,$courselevelm,$courselevel],
3412: $udom,$uname);
3413: my ($tmp)=keys(%resourcedata);
3414: if (($tmp!~/^error\:/) && ($tmp!~/^con_lost/)) {
3415: if ($resourcedata{$courselevelr}) {
3416: return $resourcedata{$courselevelr}; }
3417: if ($resourcedata{$courselevelm}) {
3418: return $resourcedata{$courselevelm}; }
3419: if ($resourcedata{$courselevel}) {
3420: return $resourcedata{$courselevel}; }
3421: } else {
3422: if ($tmp!~/No such file/) {
3423: &logthis("<font color=blue>WARNING:".
3424: " Trying to get resource data for ".
3425: $uname." at ".$udom.": ".
3426: $tmp."</font>");
3427: } elsif ($tmp=~/error:No such file/) {
3428: &EXT_cache_set($udom,$uname);
3429: } elsif ($tmp =~ /^(con_lost|no_such_host)/) {
3430: return $tmp;
3431: }
3432: }
3433: }
3434:
3435: # -------------------------------------------------------- second, check course
3436:
3437: my $coursereply=&courseresdata($ENV{'course.'.$courseid.'.num'},
3438: $ENV{'course.'.$courseid.'.domain'},
3439: ($seclevelr,$seclevelm,$seclevel,
3440: $courselevelr,$courselevelm,
3441: $courselevel));
3442: if (defined($coursereply)) { return $coursereply; }
3443:
3444: # ------------------------------------------------------ third, check map parms
3445: my %parmhash=();
3446: my $thisparm='';
3447: if (tie(%parmhash,'GDBM_File',
3448: $ENV{'request.course.fn'}.'_parms.db',
3449: &GDBM_READER(),0640)) {
3450: $thisparm=$parmhash{$symbparm};
3451: untie(%parmhash);
3452: }
3453: if ($thisparm) { return $thisparm; }
3454: }
3455: # --------------------------------------------- last, look in resource metadata
3456:
3457: $spacequalifierrest=~s/\./\_/;
3458: my $filename;
3459: if (!$symbparm) { $symbparm=&symbread(); }
3460: if ($symbparm) {
3461: $filename=(split(/\_\_\_/,$symbparm))[2];
3462: } else {
3463: $filename=$ENV{'request.filename'};
3464: }
3465: my $metadata=&metadata($filename,$spacequalifierrest);
3466: if (defined($metadata)) { return $metadata; }
3467: $metadata=&metadata($filename,'parameter_'.$spacequalifierrest);
3468: if (defined($metadata)) { return $metadata; }
3469:
3470: # ------------------------------------------------------------------ Cascade up
3471: unless ($space eq '0') {
3472: my @parts=split(/_/,$space);
3473: my $id=pop(@parts);
3474: my $part=join('_',@parts);
3475: if ($part eq '') { $part='0'; }
3476: my $partgeneral=&EXT('resource.'.$part.'.'.$qualifierrest,
3477: $symbparm,$udom,$uname,$section,1);
3478: if (defined($partgeneral)) { return $partgeneral; }
3479: }
3480: if ($recurse) { return undef; }
3481: my $pack_def=&packages_tab_default($filename,$varname);
3482: if (defined($pack_def)) { return $pack_def; }
3483:
3484: # ---------------------------------------------------- Any other user namespace
3485: } elsif ($realm eq 'environment') {
3486: # ----------------------------------------------------------------- environment
3487: if (($uname eq $ENV{'user.name'})&&($udom eq $ENV{'user.domain'})) {
3488: return $ENV{'environment.'.$spacequalifierrest};
3489: } else {
3490: my %returnhash=&userenvironment($udom,$uname,
3491: $spacequalifierrest);
3492: return $returnhash{$spacequalifierrest};
3493: }
3494: } elsif ($realm eq 'system') {
3495: # ----------------------------------------------------------------- system.time
3496: if ($space eq 'time') {
3497: return time;
3498: }
3499: }
3500: return '';
3501: }
3502:
3503: sub packages_tab_default {
3504: my ($uri,$varname)=@_;
3505: my (undef,$part,$name)=split(/\./,$varname);
3506: my $packages=&metadata($uri,'packages');
3507: foreach my $package (split(/,/,$packages)) {
3508: my ($pack_type,$pack_part)=split(/_/,$package,2);
3509: if ($pack_part eq $part) {
3510: return $packagetab{"$pack_type&$name&default"};
3511: }
3512: }
3513: return undef;
3514: }
3515:
3516: sub add_prefix_and_part {
3517: my ($prefix,$part)=@_;
3518: my $keyroot;
3519: if (defined($prefix) && $prefix !~ /^__/) {
3520: # prefix that has a part already
3521: $keyroot=$prefix;
3522: } elsif (defined($prefix)) {
3523: # prefix that is missing a part
3524: if (defined($part)) { $keyroot='_'.$part.substr($prefix,1); }
3525: } else {
3526: # no prefix at all
3527: if (defined($part)) { $keyroot='_'.$part; }
3528: }
3529: return $keyroot;
3530: }
3531:
3532: # ---------------------------------------------------------------- Get metadata
3533:
3534: sub metadata {
3535: my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
3536:
3537: $uri=&declutter($uri);
3538: # if it is a non metadata possible uri return quickly
3539: if (($uri eq '') || (($uri =~ m|^/*adm/|) && ($uri !~ m|^adm/includes|)) ||
3540: ($uri =~ m|/$|) || ($uri =~ m|/.meta$|)) {
3541: return '';
3542: }
3543: my $filename=$uri;
3544: $uri=~s/\.meta$//;
3545: #
3546: # Is the metadata already cached?
3547: # Look at timestamp of caching
3548: # Everything is cached by the main uri, libraries are never directly cached
3549: #
3550: unless (abs($metacache{$uri.':cachedtimestamp'}-time)<600 && !defined($liburi)) {
3551: #
3552: # Is this a recursive call for a library?
3553: #
3554: if ($liburi) {
3555: $liburi=&declutter($liburi);
3556: $filename=$liburi;
3557: } else {
3558: delete($metacache{$uri.':packages'});
3559: }
3560: my %metathesekeys=();
3561: unless ($filename=~/\.meta$/) { $filename.='.meta'; }
3562: my $metastring=&getfile(&filelocation('',&clutter($filename)));
3563: my $parser=HTML::LCParser->new(\$metastring);
3564: my $token;
3565: undef %metathesekeys;
3566: while ($token=$parser->get_token) {
3567: if ($token->[0] eq 'S') {
3568: if (defined($token->[2]->{'package'})) {
3569: #
3570: # This is a package - get package info
3571: #
3572: my $package=$token->[2]->{'package'};
3573: my $keyroot=&add_prefix_and_part($prefix,$token->[2]->{'part'});
3574: if (defined($token->[2]->{'id'})) {
3575: $keyroot.='_'.$token->[2]->{'id'};
3576: }
3577: if ($metacache{$uri.':packages'}) {
3578: $metacache{$uri.':packages'}.=','.$package.$keyroot;
3579: } else {
3580: $metacache{$uri.':packages'}=$package.$keyroot;
3581: }
3582: foreach (keys %packagetab) {
3583: if ($_=~/^$package\&/) {
3584: my ($pack,$name,$subp)=split(/\&/,$_);
3585: # ignore package.tab specified default values
3586: # here &package_tab_default() will fetch those
3587: if ($subp eq 'default') { next; }
3588: my $value=$packagetab{$_};
3589: my $part=$keyroot;
3590: $part=~s/^\_//;
3591: if ($subp eq 'display') {
3592: $value.=' [Part: '.$part.']';
3593: }
3594: my $unikey='parameter'.$keyroot.'_'.$name;
3595: $metacache{$uri.':'.$unikey.'.part'}=$part;
3596: $metathesekeys{$unikey}=1;
3597: unless (defined($metacache{$uri.':'.$unikey.'.'.$subp})) {
3598: $metacache{$uri.':'.$unikey.'.'.$subp}=$value;
3599: }
3600: if (defined($metacache{$uri.':'.$unikey.'.default'})) {
3601: $metacache{$uri.':'.$unikey}=
3602: $metacache{$uri.':'.$unikey.'.default'};
3603: }
3604: }
3605: }
3606: } else {
3607: #
3608: # This is not a package - some other kind of start tag
3609: #
3610: my $entry=$token->[1];
3611: my $unikey;
3612: if ($entry eq 'import') {
3613: $unikey='';
3614: } else {
3615: $unikey=$entry;
3616: }
3617: $unikey.=&add_prefix_and_part($prefix,$token->[2]->{'part'});
3618:
3619: if (defined($token->[2]->{'id'})) {
3620: $unikey.='_'.$token->[2]->{'id'};
3621: }
3622:
3623: if ($entry eq 'import') {
3624: #
3625: # Importing a library here
3626: #
3627: if ($depthcount<20) {
3628: my $location=$parser->get_text('/import');
3629: my $dir=$filename;
3630: $dir=~s|[^/]*$||;
3631: $location=&filelocation($dir,$location);
3632: foreach (sort(split(/\,/,&metadata($uri,'keys',
3633: $location,$unikey,
3634: $depthcount+1)))) {
3635: $metathesekeys{$_}=1;
3636: }
3637: }
3638: } else {
3639:
3640: if (defined($token->[2]->{'name'})) {
3641: $unikey.='_'.$token->[2]->{'name'};
3642: }
3643: $metathesekeys{$unikey}=1;
3644: foreach (@{$token->[3]}) {
3645: $metacache{$uri.':'.$unikey.'.'.$_}=$token->[2]->{$_};
3646: }
3647: my $internaltext=&HTML::Entities::decode($parser->get_text('/'.$entry));
3648: my $default=$metacache{$uri.':'.$unikey.'.default'};
3649: if ( $internaltext =~ /^\s*$/ && $default !~ /^\s*$/) {
3650: # only ws inside the tag, and not in default, so use default
3651: # as value
3652: $metacache{$uri.':'.$unikey}=$default;
3653: } else {
3654: # either something interesting inside the tag or default
3655: # uninteresting
3656: $metacache{$uri.':'.$unikey}=$internaltext;
3657: }
3658: # end of not-a-package not-a-library import
3659: }
3660: # end of not-a-package start tag
3661: }
3662: # the next is the end of "start tag"
3663: }
3664: }
3665: # are there custom rights to evaluate
3666: if ($metacache{$uri.':copyright'} eq 'custom') {
3667:
3668: #
3669: # Importing a rights file here
3670: #
3671: unless ($depthcount) {
3672: my $location=$metacache{$uri.':customdistributionfile'};
3673: my $dir=$filename;
3674: $dir=~s|[^/]*$||;
3675: $location=&filelocation($dir,$location);
3676: foreach (sort(split(/\,/,&metadata($uri,'keys',
3677: $location,'_rights',
3678: $depthcount+1)))) {
3679: $metathesekeys{$_}=1;
3680: }
3681: }
3682: }
3683: $metacache{$uri.':keys'}=join(',',keys %metathesekeys);
3684: &metadata_generate_part0(\%metathesekeys,\%metacache,$uri);
3685: $metacache{$uri.':allpossiblekeys'}=join(',',keys %metathesekeys);
3686: $metacache{$uri.':cachedtimestamp'}=time;
3687: # this is the end of "was not already recently cached
3688: }
3689: return $metacache{$uri.':'.$what};
3690: }
3691:
3692: sub metadata_generate_part0 {
3693: my ($metadata,$metacache,$uri) = @_;
3694: my %allnames;
3695: foreach my $metakey (sort keys %$metadata) {
3696: if ($metakey=~/^parameter\_(.*)/) {
3697: my $part=$$metacache{$uri.':'.$metakey.'.part'};
3698: my $name=$$metacache{$uri.':'.$metakey.'.name'};
3699: if (! exists($$metadata{'parameter_0_'.$name.'.name'})) {
3700: $allnames{$name}=$part;
3701: }
3702: }
3703: }
3704: foreach my $name (keys(%allnames)) {
3705: $$metadata{"parameter_0_$name"}=1;
3706: my $key="$uri:parameter_0_$name";
3707: $$metacache{"$key.part"}='0';
3708: $$metacache{"$key.name"}=$name;
3709: $$metacache{"$key.type"}=$$metacache{$uri.':parameter_'.
3710: $allnames{$name}.'_'.$name.
3711: '.type'};
3712: my $olddis=$$metacache{$uri.':parameter_'.$allnames{$name}.'_'.$name.
3713: '.display'};
3714: my $expr='\\[Part: '.$allnames{$name}.'\\]';
3715: $olddis=~s/$expr/\[Part: 0\]/;
3716: $$metacache{"$key.display"}=$olddis;
3717: }
3718: }
3719:
3720: # ------------------------------------------------- Get the title of a resource
3721:
3722: sub gettitle {
3723: my $urlsymb=shift;
3724: my $symb=&symbread($urlsymb);
3725: unless ($symb) {
3726: unless ($urlsymb) { $urlsymb=$ENV{'request.filename'}; }
3727: return &metadata($urlsymb,'title');
3728: }
3729: if ($titlecache{$symb}) {
3730: if (time < ($titlecache{$symb}[1] + 600)) {
3731: return $titlecache{$symb}[0];
3732: } else {
3733: delete($titlecache{$symb});
3734: }
3735: }
3736: my ($map,$resid,$url)=split(/\_\_\_/,$symb);
3737: my $title='';
3738: my %bighash;
3739: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
3740: &GDBM_READER(),0640)) {
3741: my $mapid=$bighash{'map_pc_'.&clutter($map)};
3742: $title=$bighash{'title_'.$mapid.'.'.$resid};
3743: untie %bighash;
3744: }
3745: $title=~s/\&colon\;/\:/gs;
3746: if ($title) {
3747: $titlecache{$symb}=[$title,time];
3748: return $title;
3749: } else {
3750: return &metadata($urlsymb,'title');
3751: }
3752: }
3753:
3754: # ------------------------------------------------- Update symbolic store links
3755:
3756: sub symblist {
3757: my ($mapname,%newhash)=@_;
3758: $mapname=declutter($mapname);
3759: my %hash;
3760: if (($ENV{'request.course.fn'}) && (%newhash)) {
3761: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
3762: &GDBM_WRCREAT(),0640)) {
3763: foreach (keys %newhash) {
3764: $hash{declutter($_)}=$mapname.'___'.$newhash{$_};
3765: }
3766: if (untie(%hash)) {
3767: return 'ok';
3768: }
3769: }
3770: }
3771: return 'error';
3772: }
3773:
3774: # --------------------------------------------------------------- Verify a symb
3775:
3776: sub symbverify {
3777: my ($symb,$thisfn)=@_;
3778: $thisfn=&declutter($thisfn);
3779: # direct jump to resource in page or to a sequence - will construct own symbs
3780: if ($thisfn=~/\.(page|sequence)$/) { return 1; }
3781: # check URL part
3782: my ($map,$resid,$url)=split(/\_\_\_/,$symb);
3783: unless (&symbclean($url) eq &symbclean($thisfn)) { return 0; }
3784:
3785: $symb=&symbclean($symb);
3786:
3787: my %bighash;
3788: my $okay=0;
3789: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
3790: &GDBM_READER(),0640)) {
3791: my $ids=$bighash{'ids_'.&clutter($thisfn)};
3792: unless ($ids) {
3793: $ids=$bighash{'ids_/'.$thisfn};
3794: }
3795: if ($ids) {
3796: # ------------------------------------------------------------------- Has ID(s)
3797: foreach (split(/\,/,$ids)) {
3798: my ($mapid,$resid)=split(/\./,$_);
3799: if (
3800: &symbclean(&declutter($bighash{'map_id_'.$mapid}).'___'.$resid.'___'.$thisfn)
3801: eq $symb) {
3802: $okay=1;
3803: }
3804: }
3805: }
3806: untie(%bighash);
3807: }
3808: return $okay;
3809: }
3810:
3811: # --------------------------------------------------------------- Clean-up symb
3812:
3813: sub symbclean {
3814: my $symb=shift;
3815:
3816: # remove version from map
3817: $symb=~s/\.(\d+)\.(\w+)\_\_\_/\.$2\_\_\_/;
3818:
3819: # remove version from URL
3820: $symb=~s/\.(\d+)\.(\w+)$/\.$2/;
3821:
3822: return $symb;
3823: }
3824:
3825: # ------------------------------------------------------ Return symb list entry
3826:
3827: sub symbread {
3828: my ($thisfn,$donotrecurse)=@_;
3829: # no filename provided? try from environment
3830: unless ($thisfn) {
3831: if ($ENV{'request.symb'}) { return &symbclean($ENV{'request.symb'}); }
3832: $thisfn=$ENV{'request.filename'};
3833: }
3834: # is that filename actually a symb? Verify, clean, and return
3835: if ($thisfn=~/\_\_\_\d+\_\_\_(.*)$/) {
3836: if (&symbverify($thisfn,$1)) { return &symbclean($thisfn); }
3837: }
3838: $thisfn=declutter($thisfn);
3839: my %hash;
3840: my %bighash;
3841: my $syval='';
3842: if (($ENV{'request.course.fn'}) && ($thisfn)) {
3843: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
3844: &GDBM_READER(),0640)) {
3845: $syval=$hash{$thisfn};
3846: untie(%hash);
3847: }
3848: # ---------------------------------------------------------- There was an entry
3849: if ($syval) {
3850: unless ($syval=~/\_\d+$/) {
3851: unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {
3852: &appenv('request.ambiguous' => $thisfn);
3853: return '';
3854: }
3855: $syval.=$1;
3856: }
3857: } else {
3858: # ------------------------------------------------------- Was not in symb table
3859: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
3860: &GDBM_READER(),0640)) {
3861: # ---------------------------------------------- Get ID(s) for current resource
3862: my $ids=$bighash{'ids_'.&clutter($thisfn)};
3863: unless ($ids) {
3864: $ids=$bighash{'ids_/'.$thisfn};
3865: }
3866: unless ($ids) {
3867: # alias?
3868: $ids=$bighash{'mapalias_'.$thisfn};
3869: }
3870: if ($ids) {
3871: # ------------------------------------------------------------------- Has ID(s)
3872: my @possibilities=split(/\,/,$ids);
3873: if ($#possibilities==0) {
3874: # ----------------------------------------------- There is only one possibility
3875: my ($mapid,$resid)=split(/\./,$ids);
3876: $syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;
3877: } elsif (!$donotrecurse) {
3878: # ------------------------------------------ There is more than one possibility
3879: my $realpossible=0;
3880: foreach (@possibilities) {
3881: my $file=$bighash{'src_'.$_};
3882: if (&allowed('bre',$file)) {
3883: my ($mapid,$resid)=split(/\./,$_);
3884: if ($bighash{'map_type_'.$mapid} ne 'page') {
3885: $realpossible++;
3886: $syval=declutter($bighash{'map_id_'.$mapid}).
3887: '___'.$resid;
3888: }
3889: }
3890: }
3891: if ($realpossible!=1) { $syval=''; }
3892: } else {
3893: $syval='';
3894: }
3895: }
3896: untie(%bighash)
3897: }
3898: }
3899: if ($syval) {
3900: return &symbclean($syval.'___'.$thisfn);
3901: }
3902: }
3903: &appenv('request.ambiguous' => $thisfn);
3904: return '';
3905: }
3906:
3907: # ---------------------------------------------------------- Return random seed
3908:
3909: sub numval {
3910: my $txt=shift;
3911: $txt=~tr/A-J/0-9/;
3912: $txt=~tr/a-j/0-9/;
3913: $txt=~tr/K-T/0-9/;
3914: $txt=~tr/k-t/0-9/;
3915: $txt=~tr/U-Z/0-5/;
3916: $txt=~tr/u-z/0-5/;
3917: $txt=~s/\D//g;
3918: return int($txt);
3919: }
3920:
3921: sub latest_rnd_algorithm_id {
3922: return '64bit';
3923: }
3924:
3925: sub rndseed {
3926: my ($symb,$courseid,$domain,$username)=@_;
3927:
3928: my ($wsymb,$wcourseid,$wdomain,$wusername)=&Apache::lonxml::whichuser();
3929: if (!$symb) {
3930: unless ($symb=$wsymb) { return time; }
3931: }
3932: if (!$courseid) { $courseid=$wcourseid; }
3933: if (!$domain) { $domain=$wdomain; }
3934: if (!$username) { $username=$wusername }
3935: my $which=$ENV{"course.$courseid.rndseed"};
3936: my $CODE=$ENV{'scantron.CODE'};
3937: if (defined($CODE)) {
3938: &rndseed_CODE_64bit($symb,$courseid,$domain,$username);
3939: } elsif ($which eq '64bit') {
3940: return &rndseed_64bit($symb,$courseid,$domain,$username);
3941: }
3942: return &rndseed_32bit($symb,$courseid,$domain,$username);
3943: }
3944:
3945: sub rndseed_32bit {
3946: my ($symb,$courseid,$domain,$username)=@_;
3947: {
3948: use integer;
3949: my $symbchck=unpack("%32C*",$symb) << 27;
3950: my $symbseed=numval($symb) << 22;
3951: my $namechck=unpack("%32C*",$username) << 17;
3952: my $nameseed=numval($username) << 12;
3953: my $domainseed=unpack("%32C*",$domain) << 7;
3954: my $courseseed=unpack("%32C*",$courseid);
3955: my $num=$symbseed+$nameseed+$domainseed+$courseseed+$namechck+$symbchck;
3956: #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
3957: #&Apache::lonxml::debug("rndseed :$num:$symb");
3958: return $num;
3959: }
3960: }
3961:
3962: sub rndseed_64bit {
3963: my ($symb,$courseid,$domain,$username)=@_;
3964: {
3965: use integer;
3966: my $symbchck=unpack("%32S*",$symb) << 21;
3967: my $symbseed=numval($symb) << 10;
3968: my $namechck=unpack("%32S*",$username);
3969:
3970: my $nameseed=numval($username) << 21;
3971: my $domainseed=unpack("%32S*",$domain) << 10;
3972: my $courseseed=unpack("%32S*",$courseid);
3973:
3974: my $num1=$symbchck+$symbseed+$namechck;
3975: my $num2=$nameseed+$domainseed+$courseseed;
3976: #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
3977: #&Apache::lonxml::debug("rndseed :$num:$symb");
3978: return "$num1,$num2";
3979: }
3980: }
3981:
3982: sub rndseed_CODE_64bit {
3983: my ($symb,$courseid,$domain,$username)=@_;
3984: {
3985: use integer;
3986: my $symbchck=unpack("%32S*",$symb) << 16;
3987: my $symbseed=numval($symb);
3988: my $CODEseed=numval($ENV{'scantron.CODE'}) << 16;
3989: my $courseseed=unpack("%32S*",$courseid);
3990: my $num1=$symbseed+$CODEseed;
3991: my $num2=$courseseed+$symbchck;
3992: #&Apache::lonxml::debug("$symbseed:$CODEseed|$courseseed:$symbchck");
3993: #&Apache::lonxml::debug("rndseed :$num1:$num2:$symb");
3994: return "$num1,$num2";
3995: }
3996: }
3997:
3998: sub setup_random_from_rndseed {
3999: my ($rndseed)=@_;
4000: if ($rndseed =~/,/) {
4001: my ($num1,$num2)=split(/,/,$rndseed);
4002: &Math::Random::random_set_seed(abs($num1),abs($num2));
4003: } else {
4004: &Math::Random::random_set_seed_from_phrase($rndseed);
4005: }
4006: }
4007:
4008: sub ireceipt {
4009: my ($funame,$fudom,$fucourseid,$fusymb)=@_;
4010: my $cuname=unpack("%32C*",$funame);
4011: my $cudom=unpack("%32C*",$fudom);
4012: my $cucourseid=unpack("%32C*",$fucourseid);
4013: my $cusymb=unpack("%32C*",$fusymb);
4014: my $cunique=unpack("%32C*",$perlvar{'lonReceipt'});
4015: return unpack("%32C*",$perlvar{'lonHostID'}).'-'.
4016: ($cunique%$cuname+
4017: $cunique%$cudom+
4018: $cusymb%$cuname+
4019: $cusymb%$cudom+
4020: $cucourseid%$cuname+
4021: $cucourseid%$cudom);
4022: }
4023:
4024: sub receipt {
4025: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
4026: return &ireceipt($name,$domain,$courseid,$symb);
4027: }
4028:
4029: # ------------------------------------------------------------ Serves up a file
4030: # returns either the contents of the file or a -1
4031: sub getfile {
4032: my $file=shift;
4033: if ($file=~/^\/*uploaded\//) { # user file
4034: my $ua=new LWP::UserAgent;
4035: my $request=new HTTP::Request('GET',&tokenwrapper($file));
4036: my $response=$ua->request($request);
4037: if ($response->is_success()) {
4038: return $response->content;
4039: } else {
4040: return -1;
4041: }
4042: } else { # normal file from res space
4043: &repcopy($file);
4044: if (! -e $file ) { return -1; };
4045: my $fh=Apache::File->new($file);
4046: my $a='';
4047: while (<$fh>) { $a .=$_; }
4048: return $a;
4049: }
4050: }
4051:
4052: sub filelocation {
4053: my ($dir,$file) = @_;
4054: my $location;
4055: $file=~ s/^\s*(\S+)\s*$/$1/; ## strip off leading and trailing spaces
4056: if ($file=~m:^/~:) { # is a contruction space reference
4057: $location = $file;
4058: $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
4059: } elsif ($file=~/^\/*uploaded/) { # is an uploaded file
4060: $location=$file;
4061: } else {
4062: $file=~s/^$perlvar{'lonDocRoot'}//;
4063: $file=~s:^/*res::;
4064: if ( !( $file =~ m:^/:) ) {
4065: $location = $dir. '/'.$file;
4066: } else {
4067: $location = '/home/httpd/html/res'.$file;
4068: }
4069: }
4070: $location=~s://+:/:g; # remove duplicate /
4071: while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
4072: return $location;
4073: }
4074:
4075: sub hreflocation {
4076: my ($dir,$file)=@_;
4077: unless (($file=~/^http:\/\//i) || ($file=~/^\//)) {
4078: my $finalpath=filelocation($dir,$file);
4079: $finalpath=~s/^\/home\/httpd\/html//;
4080: $finalpath=~s-/home/(\w+)/public_html/-/~$1/-;
4081: return $finalpath;
4082: } else {
4083: return $file;
4084: }
4085: }
4086:
4087: # ------------------------------------------------------------- Declutters URLs
4088:
4089: sub declutter {
4090: my $thisfn=shift;
4091: $thisfn=~s/^$perlvar{'lonDocRoot'}//;
4092: $thisfn=~s/^\///;
4093: $thisfn=~s/^res\///;
4094: $thisfn=~s/\?.+$//;
4095: return $thisfn;
4096: }
4097:
4098: # ------------------------------------------------------------- Clutter up URLs
4099:
4100: sub clutter {
4101: my $thisfn='/'.&declutter(shift);
4102: unless ($thisfn=~/^\/(uploaded|adm|userfiles|ext|raw|priv)\//) {
4103: $thisfn='/res'.$thisfn;
4104: }
4105: return $thisfn;
4106: }
4107:
4108: # -------------------------------------------------------- Escape Special Chars
4109:
4110: sub escape {
4111: my $str=shift;
4112: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
4113: return $str;
4114: }
4115:
4116: # ----------------------------------------------------- Un-Escape Special Chars
4117:
4118: sub unescape {
4119: my $str=shift;
4120: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
4121: return $str;
4122: }
4123:
4124: # ================================================================ Main Program
4125:
4126: sub goodbye {
4127: &logthis("Starting Shut down");
4128: &flushcourselogs();
4129: &logthis("Shutting down");
4130: return DONE;
4131: }
4132:
4133: BEGIN {
4134: # ----------------------------------- Read loncapa.conf and loncapa_apache.conf
4135: unless ($readit) {
4136: {
4137: my $config=Apache::File->new("/etc/httpd/conf/loncapa.conf");
4138:
4139: while (my $configline=<$config>) {
4140: if ($configline =~ /^[^\#]*PerlSetVar/) {
4141: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
4142: chomp($varvalue);
4143: $perlvar{$varname}=$varvalue;
4144: }
4145: }
4146: }
4147: {
4148: my $config=Apache::File->new("/etc/httpd/conf/loncapa_apache.conf");
4149:
4150: while (my $configline=<$config>) {
4151: if ($configline =~ /^[^\#]*PerlSetVar/) {
4152: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
4153: chomp($varvalue);
4154: $perlvar{$varname}=$varvalue;
4155: }
4156: }
4157: }
4158:
4159: # ------------------------------------------------------------ Read domain file
4160: {
4161: my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.
4162: '/domain.tab');
4163: %domaindescription = ();
4164: %domain_auth_def = ();
4165: %domain_auth_arg_def = ();
4166: if ($fh) {
4167: while (<$fh>) {
4168: next if (/^(\#|\s*$)/);
4169: # next if /^\#/;
4170: chomp;
4171: my ($domain, $domain_description, $def_auth, $def_auth_arg)
4172: = split(/:/,$_,4);
4173: $domain_auth_def{$domain}=$def_auth;
4174: $domain_auth_arg_def{$domain}=$def_auth_arg;
4175: $domaindescription{$domain}=$domain_description;
4176: # &logthis("Domain.tab: $domain, $domain_auth_def{$domain}, $domain_auth_arg_def{$domain},$domaindescription{$domain}");
4177: # &logthis("Domain.tab: $domain ".$domaindescription{$domain} );
4178: }
4179: }
4180: }
4181:
4182:
4183: # ------------------------------------------------------------- Read hosts file
4184: {
4185: my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
4186:
4187: while (my $configline=<$config>) {
4188: next if ($configline =~ /^(\#|\s*$)/);
4189: chomp($configline);
4190: my ($id,$domain,$role,$name,$ip,$domdescr)=split(/:/,$configline);
4191: if ($id && $domain && $role && $name && $ip) {
4192: $hostname{$id}=$name;
4193: $hostdom{$id}=$domain;
4194: $hostip{$id}=$ip;
4195: $iphost{$ip}=$id;
4196: if ($role eq 'library') { $libserv{$id}=$name; }
4197: } else {
4198: if ($configline) {
4199: &logthis("Skipping hosts.tab line -$configline-");
4200: }
4201: }
4202: }
4203: }
4204:
4205: # ------------------------------------------------------ Read spare server file
4206: {
4207: my $config=Apache::File->new("$perlvar{'lonTabDir'}/spare.tab");
4208:
4209: while (my $configline=<$config>) {
4210: chomp($configline);
4211: if ($configline) {
4212: $spareid{$configline}=1;
4213: }
4214: }
4215: }
4216: # ------------------------------------------------------------ Read permissions
4217: {
4218: my $config=Apache::File->new("$perlvar{'lonTabDir'}/roles.tab");
4219:
4220: while (my $configline=<$config>) {
4221: chomp($configline);
4222: if ($configline) {
4223: my ($role,$perm)=split(/ /,$configline);
4224: if ($perm ne '') { $pr{$role}=$perm; }
4225: }
4226: }
4227: }
4228:
4229: # -------------------------------------------- Read plain texts for permissions
4230: {
4231: my $config=Apache::File->new("$perlvar{'lonTabDir'}/rolesplain.tab");
4232:
4233: while (my $configline=<$config>) {
4234: chomp($configline);
4235: if ($configline) {
4236: my ($short,$plain)=split(/:/,$configline);
4237: if ($plain ne '') { $prp{$short}=$plain; }
4238: }
4239: }
4240: }
4241:
4242: # ---------------------------------------------------------- Read package table
4243: {
4244: my $config=Apache::File->new("$perlvar{'lonTabDir'}/packages.tab");
4245:
4246: while (my $configline=<$config>) {
4247: chomp($configline);
4248: my ($short,$plain)=split(/:/,$configline);
4249: my ($pack,$name)=split(/\&/,$short);
4250: if ($plain ne '') {
4251: $packagetab{$pack.'&'.$name.'&name'}=$name;
4252: $packagetab{$short}=$plain;
4253: }
4254: }
4255: }
4256:
4257: # ------------- set up temporary directory
4258: {
4259: $tmpdir = $perlvar{'lonDaemons'}.'/tmp/';
4260:
4261: }
4262:
4263: %metacache=();
4264:
4265: $processmarker='_'.time.'_'.$perlvar{'lonHostID'};
4266: $dumpcount=0;
4267:
4268: &logtouch();
4269: &logthis('<font color=yellow>INFO: Read configuration</font>');
4270: $readit=1;
4271: }
4272: }
4273:
4274: 1;
4275: __END__
4276:
4277: =pod
4278:
4279: =head1 NAME
4280:
4281: Apache::lonnet - Subroutines to ask questions about things in the network.
4282:
4283: =head1 SYNOPSIS
4284:
4285: Invoked by other LON-CAPA modules, when they need to talk to or about objects in the network.
4286:
4287: &Apache::lonnet::SUBROUTINENAME(ARGUMENTS);
4288:
4289: Common parameters:
4290:
4291: =over 4
4292:
4293: =item *
4294:
4295: $uname : an internal username (if $cname expecting a course Id specifically)
4296:
4297: =item *
4298:
4299: $udom : a domain (if $cdom expecting a course's domain specifically)
4300:
4301: =item *
4302:
4303: $symb : a resource instance identifier
4304:
4305: =item *
4306:
4307: $namespace : the name of a .db file that contains the data needed or
4308: being set.
4309:
4310: =back
4311:
4312: =head1 OVERVIEW
4313:
4314: lonnet provides subroutines which interact with the
4315: lonc/lond (TCP) network layer of LON-CAPA. They can be used to ask
4316: about classes, users, and resources.
4317:
4318: For many of these objects you can also use this to store data about
4319: them or modify them in various ways.
4320:
4321: =head2 Symbs
4322:
4323: To identify a specific instance of a resource, LON-CAPA uses symbols
4324: or "symbs"X<symb>. These identifiers are built from the URL of the
4325: map, the resource number of the resource in the map, and the URL of
4326: the resource itself. The latter is somewhat redundant, but might help
4327: if maps change.
4328:
4329: An example is
4330:
4331: msu/korte/parts/part1.sequence___19___msu/korte/tests/part12.problem
4332:
4333: The respective map entry is
4334:
4335: <resource id="19" src="/res/msu/korte/tests/part12.problem"
4336: title="Problem 2">
4337: </resource>
4338:
4339: Symbs are used by the random number generator, as well as to store and
4340: restore data specific to a certain instance of for example a problem.
4341:
4342: =head2 Storing And Retrieving Data
4343:
4344: X<store()>X<cstore()>X<restore()>Three of the most important functions
4345: in C<lonnet.pm> are C<&Apache::lonnet::cstore()>,
4346: C<&Apache::lonnet:restore()>, and C<&Apache::lonnet::store()>, which
4347: is is the non-critical message twin of cstore. These functions are for
4348: handlers to store a perl hash to a user's permanent data space in an
4349: easy manner, and to retrieve it again on another call. It is expected
4350: that a handler would use this once at the beginning to retrieve data,
4351: and then again once at the end to send only the new data back.
4352:
4353: The data is stored in the user's data directory on the user's
4354: homeserver under the ID of the course.
4355:
4356: The hash that is returned by restore will have all of the previous
4357: value for all of the elements of the hash.
4358:
4359: Example:
4360:
4361: #creating a hash
4362: my %hash;
4363: $hash{'foo'}='bar';
4364:
4365: #storing it
4366: &Apache::lonnet::cstore(\%hash);
4367:
4368: #changing a value
4369: $hash{'foo'}='notbar';
4370:
4371: #adding a new value
4372: $hash{'bar'}='foo';
4373: &Apache::lonnet::cstore(\%hash);
4374:
4375: #retrieving the hash
4376: my %history=&Apache::lonnet::restore();
4377:
4378: #print the hash
4379: foreach my $key (sort(keys(%history))) {
4380: print("\%history{$key} = $history{$key}");
4381: }
4382:
4383: Will print out:
4384:
4385: %history{1:foo} = bar
4386: %history{1:keys} = foo:timestamp
4387: %history{1:timestamp} = 990455579
4388: %history{2:bar} = foo
4389: %history{2:foo} = notbar
4390: %history{2:keys} = foo:bar:timestamp
4391: %history{2:timestamp} = 990455580
4392: %history{bar} = foo
4393: %history{foo} = notbar
4394: %history{timestamp} = 990455580
4395: %history{version} = 2
4396:
4397: Note that the special hash entries C<keys>, C<version> and
4398: C<timestamp> were added to the hash. C<version> will be equal to the
4399: total number of versions of the data that have been stored. The
4400: C<timestamp> attribute will be the UNIX time the hash was
4401: stored. C<keys> is available in every historical section to list which
4402: keys were added or changed at a specific historical revision of a
4403: hash.
4404:
4405: B<Warning>: do not store the hash that restore returns directly. This
4406: will cause a mess since it will restore the historical keys as if the
4407: were new keys. I.E. 1:foo will become 1:1:foo etc.
4408:
4409: Calling convention:
4410:
4411: my %record=&Apache::lonnet::restore($symb,$courseid,$domain,$uname,$home);
4412: &Apache::lonnet::cstore(\%newrecord,$symb,$courseid,$domain,$uname,$home);
4413:
4414: For more detailed information, see lonnet specific documentation.
4415:
4416: =head1 RETURN MESSAGES
4417:
4418: =over 4
4419:
4420: =item * B<con_lost>: unable to contact remote host
4421:
4422: =item * B<con_delayed>: unable to contact remote host, message will be delivered
4423: when the connection is brought back up
4424:
4425: =item * B<con_failed>: unable to contact remote host and unable to save message
4426: for later delivery
4427:
4428: =item * B<error:>: an error a occured, a description of the error follows the :
4429:
4430: =item * B<no_such_host>: unable to fund a host associated with the user/domain
4431: that was requested
4432:
4433: =back
4434:
4435: =head1 PUBLIC SUBROUTINES
4436:
4437: =head2 Session Environment Functions
4438:
4439: =over 4
4440:
4441: =item *
4442: X<appenv()>
4443: B<appenv(%hash)>: the value of %hash is written to
4444: the user envirnoment file, and will be restored for each access this
4445: user makes during this session, also modifies the %ENV for the current
4446: process
4447:
4448: =item *
4449: X<delenv()>
4450: B<delenv($regexp)>: removes all items from the session
4451: environment file that matches the regular expression in $regexp. The
4452: values are also delted from the current processes %ENV.
4453:
4454: =back
4455:
4456: =head2 User Information
4457:
4458: =over 4
4459:
4460: =item *
4461: X<queryauthenticate()>
4462: B<queryauthenticate($uname,$udom)>: try to determine user's current
4463: authentication scheme
4464:
4465: =item *
4466: X<authenticate()>
4467: B<authenticate($uname,$upass,$udom)>: try to
4468: authenticate user from domain's lib servers (first use the current
4469: one). C<$upass> should be the users password.
4470:
4471: =item *
4472: X<homeserver()>
4473: B<homeserver($uname,$udom)>: find the server which has
4474: the user's directory and files (there must be only one), this caches
4475: the answer, and also caches if there is a borken connection.
4476:
4477: =item *
4478: X<idget()>
4479: B<idget($udom,@ids)>: find the usernames behind a list of IDs
4480: (IDs are a unique resource in a domain, there must be only 1 ID per
4481: username, and only 1 username per ID in a specific domain) (returns
4482: hash: id=>name,id=>name)
4483:
4484: =item *
4485: X<idrget()>
4486: B<idrget($udom,@unames)>: find the IDs behind a list of
4487: usernames (returns hash: name=>id,name=>id)
4488:
4489: =item *
4490: X<idput()>
4491: B<idput($udom,%ids)>: store away a list of names and associated IDs
4492:
4493: =item *
4494: X<rolesinit()>
4495: B<rolesinit($udom,$username,$authhost)>: get user privileges
4496:
4497: =item *
4498: X<usection()>
4499: B<usection($udom,$uname,$cname)>: finds the section of student in the
4500: course $cname, return section name/number or '' for "not in course"
4501: and '-1' for "no section"
4502:
4503: =item *
4504: X<userenvironment()>
4505: B<userenvironment($udom,$uname,@what)>: gets the values of the keys
4506: passed in @what from the requested user's environment, returns a hash
4507:
4508: =back
4509:
4510: =head2 User Roles
4511:
4512: =over 4
4513:
4514: =item *
4515:
4516: allowed($priv,$uri) : check for a user privilege; returns codes for allowed
4517: actions
4518: F: full access
4519: U,I,K: authentication modes (cxx only)
4520: '': forbidden
4521: 1: user needs to choose course
4522: 2: browse allowed
4523:
4524: =item *
4525:
4526: definerole($rolename,$sysrole,$domrole,$courole) : define role; define a custom
4527: role rolename set privileges in format of lonTabs/roles.tab for system, domain,
4528: and course level
4529:
4530: =item *
4531:
4532: plaintext($short) : return value in %prp hash (rolesplain.tab); plain text
4533: explanation of a user role term
4534:
4535: =back
4536:
4537: =head2 User Modification
4538:
4539: =over 4
4540:
4541: =item *
4542:
4543: assignrole($udom,$uname,$url,$role,$end,$start) : assign role; give a role to a
4544: user for the level given by URL. Optional start and end dates (leave empty
4545: string or zero for "no date")
4546:
4547: =item *
4548:
4549: changepass($uname,$udom,$currentpass,$newpass,$server) : attempts to
4550: change a users, password, possible return values are: ok,
4551: pwchange_failure, non_authorized, auth_mode_error, unknown_user,
4552: refused
4553:
4554: =item *
4555:
4556: modifyuserauth($udom,$uname,$umode,$upass) : modify user authentication
4557:
4558: =item *
4559:
4560: modifyuser($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene) :
4561: modify user
4562:
4563: =item *
4564:
4565: modifystudent
4566:
4567: modify a students enrollment and identification information.
4568: The course id is resolved based on the current users environment.
4569: This means the envoking user must be a course coordinator or otherwise
4570: associated with a course.
4571:
4572: This call is essentially a wrapper for lonnet::modifyuser and
4573: lonnet::modify_student_enrollment
4574:
4575: Inputs:
4576:
4577: =over 4
4578:
4579: =item B<$udom> Students loncapa domain
4580:
4581: =item B<$uname> Students loncapa login name
4582:
4583: =item B<$uid> Students id/student number
4584:
4585: =item B<$umode> Students authentication mode
4586:
4587: =item B<$upass> Students password
4588:
4589: =item B<$first> Students first name
4590:
4591: =item B<$middle> Students middle name
4592:
4593: =item B<$last> Students last name
4594:
4595: =item B<$gene> Students generation
4596:
4597: =item B<$usec> Students section in course
4598:
4599: =item B<$end> Unix time of the roles expiration
4600:
4601: =item B<$start> Unix time of the roles start date
4602:
4603: =item B<$forceid> If defined, allow $uid to be changed
4604:
4605: =item B<$desiredhome> server to use as home server for student
4606:
4607: =back
4608:
4609: =item *
4610:
4611: modify_student_enrollment
4612:
4613: Change a students enrollment status in a class. The environment variable
4614: 'role.request.course' must be defined for this function to proceed.
4615:
4616: Inputs:
4617:
4618: =over 4
4619:
4620: =item $udom, students domain
4621:
4622: =item $uname, students name
4623:
4624: =item $uid, students user id
4625:
4626: =item $first, students first name
4627:
4628: =item $middle
4629:
4630: =item $last
4631:
4632: =item $gene
4633:
4634: =item $usec
4635:
4636: =item $end
4637:
4638: =item $start
4639:
4640: =back
4641:
4642:
4643: =item *
4644:
4645: assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start) : assign
4646: custom role; give a custom role to a user for the level given by URL. Specify
4647: name and domain of role author, and role name
4648:
4649: =item *
4650:
4651: revokerole($udom,$uname,$url,$role) : revoke a role for url
4652:
4653: =item *
4654:
4655: revokecustomrole($udom,$uname,$url,$role) : revoke a custom role
4656:
4657: =back
4658:
4659: =head2 Course Infomation
4660:
4661: =over 4
4662:
4663: =item *
4664:
4665: coursedescription($courseid) : course description
4666:
4667: =item *
4668:
4669: courseresdata($coursenum,$coursedomain,@which) : request for current
4670: parameter setting for a specific course, @what should be a list of
4671: parameters to ask about. This routine caches answers for 5 minutes.
4672:
4673: =back
4674:
4675: =head2 Course Modification
4676:
4677: =over 4
4678:
4679: =item *
4680:
4681: writecoursepref($courseid,%prefs) : write preferences (environment
4682: database) for a course
4683:
4684: =item *
4685:
4686: createcourse($udom,$description,$url) : make/modify course
4687:
4688: =back
4689:
4690: =head2 Resource Subroutines
4691:
4692: =over 4
4693:
4694: =item *
4695:
4696: subscribe($fname) : subscribe to a resource, returns URL if possible (probably should use repcopy instead)
4697:
4698: =item *
4699:
4700: repcopy($filename) : subscribes to the requested file, and attempts to
4701: replicate from the owning library server, Might return
4702: HTTP_SERVICE_UNAVAILABLE, HTTP_NOT_FOUND, FORBIDDEN, OK, or
4703: HTTP_BAD_REQUEST, also attempts to grab the metadata for the
4704: resource. Expects the local filesystem pathname
4705: (/home/httpd/html/res/....)
4706:
4707: =back
4708:
4709: =head2 Resource Information
4710:
4711: =over 4
4712:
4713: =item *
4714:
4715: EXT($varname,$symb,$udom,$uname) : evaluates and returns the value of
4716: a vairety of different possible values, $varname should be a request
4717: string, and the other parameters can be used to specify who and what
4718: one is asking about.
4719:
4720: Possible values for $varname are environment.lastname (or other item
4721: from the envirnment hash), user.name (or someother aspect about the
4722: user), resource.0.maxtries (or some other part and parameter of a
4723: resource)
4724:
4725: =item *
4726:
4727: directcondval($number) : get current value of a condition; reads from a state
4728: string
4729:
4730: =item *
4731:
4732: condval($condidx) : value of condition index based on state
4733:
4734: =item *
4735:
4736: metadata($uri,$what,$liburi,$prefix,$depthcount) : request a
4737: resource's metadata, $what should be either a specific key, or either
4738: 'keys' (to get a list of possible keys) or 'packages' to get a list of
4739: packages that this resource currently uses, the last 3 arguments are only used internally for recursive metadata.
4740:
4741: this function automatically caches all requests
4742:
4743: =item *
4744:
4745: metadata_query($query,$custom,$customshow) : make a metadata query against the
4746: network of library servers; returns file handle of where SQL and regex results
4747: will be stored for query
4748:
4749: =item *
4750:
4751: symbread($filename) : return symbolic list entry (filename argument optional);
4752: returns the data handle
4753:
4754: =item *
4755:
4756: symbverify($symb,$thisfn) : verifies that $symb actually exists and is
4757: a possible symb for the URL in $thisfn, returns a 1 on success, 0 on
4758: failure, user must be in a course, as it assumes the existance of the
4759: course initi hash, and uses $ENV('request.course.id'}
4760:
4761:
4762: =item *
4763:
4764: symbclean($symb) : removes versions numbers from a symb, returns the
4765: cleaned symb
4766:
4767: =item *
4768:
4769: is_on_map($uri) : checks if the $uri is somewhere on the current
4770: course map, user must be in a course for it to work.
4771:
4772: =item *
4773:
4774: numval($salt) : return random seed value (addend for rndseed)
4775:
4776: =item *
4777:
4778: rndseed($symb,$courseid,$udom,$uname) : create a random sum; returns
4779: a random seed, all arguments are optional, if they aren't sent it uses the
4780: environment to derive them. Note: if symb isn't sent and it can't get one
4781: from &symbread it will use the current time as its return value
4782:
4783: =item *
4784:
4785: ireceipt($funame,$fudom,$fucourseid,$fusymb) : return unique,
4786: unfakeable, receipt
4787:
4788: =item *
4789:
4790: receipt() : API to ireceipt working off of ENV values; given out to users
4791:
4792: =item *
4793:
4794: countacc($url) : count the number of accesses to a given URL
4795:
4796: =item *
4797:
4798: checkout($symb,$tuname,$tudom,$tcrsid) : creates a record of a user having looked at an item, most likely printed out or otherwise using a resource
4799:
4800: =item *
4801:
4802: checkin($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 $tcrsid)
4803:
4804: =item *
4805:
4806: expirespread($uname,$udom,$stype,$usymb) : set expire date for spreadsheet
4807:
4808: =item *
4809:
4810: devalidate($symb) : devalidate temporary spreadsheet calculations,
4811: forcing spreadsheet to reevaluate the resource scores next time.
4812:
4813: =back
4814:
4815: =head2 Storing/Retreiving Data
4816:
4817: =over 4
4818:
4819: =item *
4820:
4821: store($storehash,$symb,$namespace,$udom,$uname) : stores hash permanently
4822: for this url; hashref needs to be given and should be a \%hashname; the
4823: remaining args aren't required and if they aren't passed or are '' they will
4824: be derived from the ENV
4825:
4826: =item *
4827:
4828: cstore($storehash,$symb,$namespace,$udom,$uname) : same as store but
4829: uses critical subroutine
4830:
4831: =item *
4832:
4833: restore($symb,$namespace,$udom,$uname) : returns hash for this symb;
4834: all args are optional
4835:
4836: =item *
4837:
4838: tmpstore($storehash,$symb,$namespace,$udom,$uname) : storage that
4839: works very similar to store/cstore, but all data is stored in a
4840: temporary location and can be reset using tmpreset, $storehash should
4841: be a hash reference, returns nothing on success
4842:
4843: =item *
4844:
4845: tmprestore($symb,$namespace,$udom,$uname) : storage that works very
4846: similar to restore, but all data is stored in a temporary location and
4847: can be reset using tmpreset. Returns a hash of values on success,
4848: error string otherwise.
4849:
4850: =item *
4851:
4852: tmpreset($symb,$namespace,$udom,$uname) : temporary storage reset,
4853: deltes all keys for $symb form the temporary storage hash.
4854:
4855: =item *
4856:
4857: get($namespace,$storearr,$udom,$uname) : returns hash with keys from array
4858: reference filled in from namesp ($udom and $uname are optional)
4859:
4860: =item *
4861:
4862: del($namespace,$storearr,$udom,$uname) : deletes keys out of array from
4863: namesp ($udom and $uname are optional)
4864:
4865: =item *
4866:
4867: dump($namespace,$udom,$uname,$regexp) :
4868: dumps the complete (or key matching regexp) namespace into a hash
4869: ($udom, $uname and $regexp are optional)
4870:
4871: =item *
4872:
4873: put($namespace,$storehash,$udom,$uname) : stores hash in namesp
4874: ($udom and $uname are optional)
4875:
4876: =item *
4877:
4878: cput($namespace,$storehash,$udom,$uname) : critical put
4879: ($udom and $uname are optional)
4880:
4881: =item *
4882:
4883: eget($namespace,$storearr,$udom,$uname) : returns hash with keys from array
4884: reference filled in from namesp (encrypts the return communication)
4885: ($udom and $uname are optional)
4886:
4887: =item *
4888:
4889: log($udom,$name,$home,$message) : write to permanent log for user; use
4890: critical subroutine
4891:
4892: =back
4893:
4894: =head2 Network Status Functions
4895:
4896: =over 4
4897:
4898: =item *
4899:
4900: dirlist($uri) : return directory list based on URI
4901:
4902: =item *
4903:
4904: spareserver() : find server with least workload from spare.tab
4905:
4906: =back
4907:
4908: =head2 Apache Request
4909:
4910: =over 4
4911:
4912: =item *
4913:
4914: ssi($url,%hash) : server side include, does a complete request cycle on url to
4915: localhost, posts hash
4916:
4917: =back
4918:
4919: =head2 Data to String to Data
4920:
4921: =over 4
4922:
4923: =item *
4924:
4925: hash2str(%hash) : convert a hash into a string complete with escaping and '='
4926: and '&' separators, supports elements that are arrayrefs and hashrefs
4927:
4928: =item *
4929:
4930: hashref2str($hashref) : convert a hashref into a string complete with
4931: escaping and '=' and '&' separators, supports elements that are
4932: arrayrefs and hashrefs
4933:
4934: =item *
4935:
4936: arrayref2str($arrayref) : convert an arrayref into a string complete
4937: with escaping and '&' separators, supports elements that are arrayrefs
4938: and hashrefs
4939:
4940: =item *
4941:
4942: str2hash($string) : convert string to hash using unescaping and
4943: splitting on '=' and '&', supports elements that are arrayrefs and
4944: hashrefs
4945:
4946: =item *
4947:
4948: str2array($string) : convert string to hash using unescaping and
4949: splitting on '&', supports elements that are arrayrefs and hashrefs
4950:
4951: =back
4952:
4953: =head2 Logging Routines
4954:
4955: =over 4
4956:
4957: These routines allow one to make log messages in the lonnet.log and
4958: lonnet.perm logfiles.
4959:
4960: =item *
4961:
4962: logtouch() : make sure the logfile, lonnet.log, exists
4963:
4964: =item *
4965:
4966: logthis() : append message to the normal lonnet.log file, it gets
4967: preiodically rolled over and deleted.
4968:
4969: =item *
4970:
4971: logperm() : append a permanent message to lonnet.perm.log, this log
4972: file never gets deleted by any automated portion of the system, only
4973: messages of critical importance should go in here.
4974:
4975: =back
4976:
4977: =head2 General File Helper Routines
4978:
4979: =over 4
4980:
4981: =item *
4982:
4983: getfile($file) : returns the entire contents of a file or -1; it
4984: properly subscribes to and replicates the file if neccessary.
4985:
4986: =item *
4987:
4988: filelocation($dir,$file) : returns file system location of a file
4989: based on URI; meant to be "fairly clean" absolute reference, $dir is a
4990: directory that relative $file lookups are to looked in ($dir of /a/dir
4991: and a file of ../bob will become /a/bob)
4992:
4993: =item *
4994:
4995: hreflocation($dir,$file) : returns file system location or a URL; same as
4996: filelocation except for hrefs
4997:
4998: =item *
4999:
5000: declutter() : declutters URLs (remove docroot, beginning slashes, 'res' etc)
5001:
5002: =back
5003:
5004: =head2 HTTP Helper Routines
5005:
5006: =over 4
5007:
5008: =item *
5009:
5010: escape() : unpack non-word characters into CGI-compatible hex codes
5011:
5012: =item *
5013:
5014: unescape() : pack CGI-compatible hex codes into actual non-word ASCII character
5015:
5016: =back
5017:
5018: =head1 PRIVATE SUBROUTINES
5019:
5020: =head2 Underlying communication routines (Shouldn't call)
5021:
5022: =over 4
5023:
5024: =item *
5025:
5026: subreply() : tries to pass a message to lonc, returns con_lost if incapable
5027:
5028: =item *
5029:
5030: reply() : uses subreply to send a message to remote machine, logs all failures
5031:
5032: =item *
5033:
5034: critical() : passes a critical message to another server; if cannot
5035: get through then place message in connection buffer directory and
5036: returns con_delayed, if incapable of saving message, returns
5037: con_failed
5038:
5039: =item *
5040:
5041: reconlonc() : tries to reconnect lonc client processes.
5042:
5043: =back
5044:
5045: =head2 Resource Access Logging
5046:
5047: =over 4
5048:
5049: =item *
5050:
5051: flushcourselogs() : flush (save) buffer logs and access logs
5052:
5053: =item *
5054:
5055: courselog($what) : save message for course in hash
5056:
5057: =item *
5058:
5059: courseacclog($what) : save message for course using &courselog(). Perform
5060: special processing for specific resource types (problems, exams, quizzes, etc).
5061:
5062: =item *
5063:
5064: goodbye() : flush course logs and log shutting down; it is called in srm.conf
5065: as a PerlChildExitHandler
5066:
5067: =back
5068:
5069: =head2 Other
5070:
5071: =over 4
5072:
5073: =item *
5074:
5075: symblist($mapname,%newhash) : update symbolic storage links
5076:
5077: =back
5078:
5079: =cut
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