File:
[LON-CAPA] /
loncom /
lonnet /
perl /
lonnet.pm
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1.218:
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Mon May 13 09:26:29 2002 UTC (22 years, 3 months ago) by
albertel
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- &EXT() takes optional $udom and $uname args, it they aren't specified
it checks with &Apache::lonxml::whichuser() to figure out who we are
running for
- However user.role
user.course
user.access currently ignore this information
(user.access needs a &allowed to support this kind of user shifting)
(user.course is only broken if the current user's current role is
not the specific course they are asking about, this
arguably shouldn't happen, and maybe should just
explicitly return a blank when it happens)
(user.role will return incorrect information since the requesting
user will generally have a different role from what the
user would have)
1: # The LearningOnline Network
2: # TCP networking package
3: #
4: # $Id: lonnet.pm,v 1.218 2002/05/13 09:26:29 albertel 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: # 02/27/01 Scott Harrison
51: # 3/2 Gerd Kortemeyer
52: # 3/15,3/19 Scott Harrison
53: # 3/19,3/20 Gerd Kortemeyer
54: # 3/22,3/27,4/2,4/16,4/17 Scott Harrison
55: # 5/26,5/28 Gerd Kortemeyer
56: # 5/30 H. K. Ng
57: # 6/1 Gerd Kortemeyer
58: # July Guy Albertelli
59: # 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,
60: # 10/2 Gerd Kortemeyer
61: # 10/5,10/10,11/13,11/15 Scott Harrison
62: # 11/17,11/20,11/22,11/29 Gerd Kortemeyer
63: # 12/5 Matthew Hall
64: # 12/5 Guy Albertelli
65: # 12/6,12/7,12/12 Gerd Kortemeyer
66: # 12/18 Scott Harrison
67: # 12/21,12/22,12/27,12/28 Gerd Kortemeyer
68: # YEAR=2002
69: # 1/4,2/4,2/7 Gerd Kortemeyer
70: #
71: ###
72:
73: package Apache::lonnet;
74:
75: use strict;
76: use Apache::File;
77: use LWP::UserAgent();
78: use HTTP::Headers;
79: use vars
80: qw(%perlvar %hostname %homecache %hostip %spareid %hostdom
81: %libserv %pr %prp %metacache %packagetab
82: %courselogs %accesshash $processmarker $dumpcount
83: %coursedombuf %coursehombuf %courseresdatacache);
84: use IO::Socket;
85: use GDBM_File;
86: use Apache::Constants qw(:common :http);
87: use HTML::LCParser;
88: use Fcntl qw(:flock);
89: my $readit;
90:
91: # --------------------------------------------------------------------- Logging
92:
93: sub logtouch {
94: my $execdir=$perlvar{'lonDaemons'};
95: unless (-e "$execdir/logs/lonnet.log") {
96: my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
97: close $fh;
98: }
99: my ($wwwuid,$wwwgid)=(getpwnam('www'))[2,3];
100: chown($wwwuid,$wwwgid,$execdir.'/logs/lonnet.log');
101: }
102:
103: sub logthis {
104: my $message=shift;
105: my $execdir=$perlvar{'lonDaemons'};
106: my $now=time;
107: my $local=localtime($now);
108: my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
109: print $fh "$local ($$): $message\n";
110: return 1;
111: }
112:
113: sub logperm {
114: my $message=shift;
115: my $execdir=$perlvar{'lonDaemons'};
116: my $now=time;
117: my $local=localtime($now);
118: my $fh=Apache::File->new(">>$execdir/logs/lonnet.perm.log");
119: print $fh "$now:$message:$local\n";
120: return 1;
121: }
122:
123: # -------------------------------------------------- Non-critical communication
124: sub subreply {
125: my ($cmd,$server)=@_;
126: my $peerfile="$perlvar{'lonSockDir'}/$server";
127: my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
128: Type => SOCK_STREAM,
129: Timeout => 10)
130: or return "con_lost";
131: print $client "$cmd\n";
132: my $answer=<$client>;
133: if (!$answer) { $answer="con_lost"; }
134: chomp($answer);
135: return $answer;
136: }
137:
138: sub reply {
139: my ($cmd,$server)=@_;
140: unless (defined($hostname{$server})) { return 'no_such_host'; }
141: my $answer=subreply($cmd,$server);
142: if ($answer eq 'con_lost') {
143: sleep 5;
144: $answer=subreply($cmd,$server);
145: if ($answer eq 'con_lost') {
146: &logthis("Second attempt con_lost on $server");
147: my $peerfile="$perlvar{'lonSockDir'}/$server";
148: my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
149: Type => SOCK_STREAM,
150: Timeout => 10)
151: or return "con_lost";
152: &logthis("Killing socket");
153: print $client "close_connection_exit\n";
154: sleep 5;
155: $answer=subreply($cmd,$server);
156: }
157: }
158: if (($answer=~/^refused/) || ($answer=~/^rejected/)) {
159: &logthis("<font color=blue>WARNING:".
160: " $cmd to $server returned $answer</font>");
161: }
162: return $answer;
163: }
164:
165: # ----------------------------------------------------------- Send USR1 to lonc
166:
167: sub reconlonc {
168: my $peerfile=shift;
169: &logthis("Trying to reconnect for $peerfile");
170: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
171: if (my $fh=Apache::File->new("$loncfile")) {
172: my $loncpid=<$fh>;
173: chomp($loncpid);
174: if (kill 0 => $loncpid) {
175: &logthis("lonc at pid $loncpid responding, sending USR1");
176: kill USR1 => $loncpid;
177: sleep 1;
178: if (-e "$peerfile") { return; }
179: &logthis("$peerfile still not there, give it another try");
180: sleep 5;
181: if (-e "$peerfile") { return; }
182: &logthis(
183: "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
184: } else {
185: &logthis(
186: "<font color=blue>WARNING:".
187: " lonc at pid $loncpid not responding, giving up</font>");
188: }
189: } else {
190: &logthis('<font color=blue>WARNING: lonc not running, giving up</font>');
191: }
192: }
193:
194: # ------------------------------------------------------ Critical communication
195:
196: sub critical {
197: my ($cmd,$server)=@_;
198: unless ($hostname{$server}) {
199: &logthis("<font color=blue>WARNING:".
200: " Critical message to unknown server ($server)</font>");
201: return 'no_such_host';
202: }
203: my $answer=reply($cmd,$server);
204: if ($answer eq 'con_lost') {
205: my $pingreply=reply('ping',$server);
206: &reconlonc("$perlvar{'lonSockDir'}/$server");
207: my $pongreply=reply('pong',$server);
208: &logthis("Ping/Pong for $server: $pingreply/$pongreply");
209: $answer=reply($cmd,$server);
210: if ($answer eq 'con_lost') {
211: my $now=time;
212: my $middlename=$cmd;
213: $middlename=substr($middlename,0,16);
214: $middlename=~s/\W//g;
215: my $dfilename=
216: "$perlvar{'lonSockDir'}/delayed/$now.$middlename.$server";
217: {
218: my $dfh;
219: if ($dfh=Apache::File->new(">$dfilename")) {
220: print $dfh "$cmd\n";
221: }
222: }
223: sleep 2;
224: my $wcmd='';
225: {
226: my $dfh;
227: if ($dfh=Apache::File->new("$dfilename")) {
228: $wcmd=<$dfh>;
229: }
230: }
231: chomp($wcmd);
232: if ($wcmd eq $cmd) {
233: &logthis("<font color=blue>WARNING: ".
234: "Connection buffer $dfilename: $cmd</font>");
235: &logperm("D:$server:$cmd");
236: return 'con_delayed';
237: } else {
238: &logthis("<font color=red>CRITICAL:"
239: ." Critical connection failed: $server $cmd</font>");
240: &logperm("F:$server:$cmd");
241: return 'con_failed';
242: }
243: }
244: }
245: return $answer;
246: }
247:
248: # ---------------------------------------------------------- Append Environment
249:
250: sub appenv {
251: my %newenv=@_;
252: foreach (keys %newenv) {
253: if (($newenv{$_}=~/^user\.role/) || ($newenv{$_}=~/^user\.priv/)) {
254: &logthis("<font color=blue>WARNING: ".
255: "Attempt to modify environment ".$_." to ".$newenv{$_}
256: .'</font>');
257: delete($newenv{$_});
258: } else {
259: $ENV{$_}=$newenv{$_};
260: }
261: }
262:
263: my $lockfh;
264: unless ($lockfh=Apache::File->new("$ENV{'user.environment'}")) {
265: return 'error: '.$!;
266: }
267: unless (flock($lockfh,LOCK_EX)) {
268: &logthis("<font color=blue>WARNING: ".
269: 'Could not obtain exclusive lock in appenv: '.$!);
270: $lockfh->close();
271: return 'error: '.$!;
272: }
273:
274: my @oldenv;
275: {
276: my $fh;
277: unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
278: return 'error: '.$!;
279: }
280: @oldenv=<$fh>;
281: $fh->close();
282: }
283: for (my $i=0; $i<=$#oldenv; $i++) {
284: chomp($oldenv[$i]);
285: if ($oldenv[$i] ne '') {
286: my ($name,$value)=split(/=/,$oldenv[$i]);
287: unless (defined($newenv{$name})) {
288: $newenv{$name}=$value;
289: }
290: }
291: }
292: {
293: my $fh;
294: unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
295: return 'error';
296: }
297: my $newname;
298: foreach $newname (keys %newenv) {
299: print $fh "$newname=$newenv{$newname}\n";
300: }
301: $fh->close();
302: }
303:
304: $lockfh->close();
305: return 'ok';
306: }
307: # ----------------------------------------------------- Delete from Environment
308:
309: sub delenv {
310: my $delthis=shift;
311: my %newenv=();
312: if (($delthis=~/user\.role/) || ($delthis=~/user\.priv/)) {
313: &logthis("<font color=blue>WARNING: ".
314: "Attempt to delete from environment ".$delthis);
315: return 'error';
316: }
317: my @oldenv;
318: {
319: my $fh;
320: unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
321: return 'error';
322: }
323: unless (flock($fh,LOCK_SH)) {
324: &logthis("<font color=blue>WARNING: ".
325: 'Could not obtain shared lock in delenv: '.$!);
326: $fh->close();
327: return 'error: '.$!;
328: }
329: @oldenv=<$fh>;
330: $fh->close();
331: }
332: {
333: my $fh;
334: unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
335: return 'error';
336: }
337: unless (flock($fh,LOCK_EX)) {
338: &logthis("<font color=blue>WARNING: ".
339: 'Could not obtain exclusive lock in delenv: '.$!);
340: $fh->close();
341: return 'error: '.$!;
342: }
343: foreach (@oldenv) {
344: unless ($_=~/^$delthis/) { print $fh $_; }
345: }
346: $fh->close();
347: }
348: return 'ok';
349: }
350:
351: # ------------------------------ Find server with least workload from spare.tab
352:
353: sub spareserver {
354: my $tryserver;
355: my $spareserver='';
356: my $lowestserver=100;
357: foreach $tryserver (keys %spareid) {
358: my $answer=reply('load',$tryserver);
359: if (($answer =~ /\d/) && ($answer<$lowestserver)) {
360: $spareserver="http://$hostname{$tryserver}";
361: $lowestserver=$answer;
362: }
363: }
364: return $spareserver;
365: }
366:
367: # --------------------------------------------- Try to change a user's password
368:
369: sub changepass {
370: my ($uname,$udom,$currentpass,$newpass,$server)=@_;
371: $currentpass = &escape($currentpass);
372: $newpass = &escape($newpass);
373: my $answer = reply("encrypt:passwd:$udom:$uname:$currentpass:$newpass",
374: $server);
375: if (! $answer) {
376: &logthis("No reply on password change request to $server ".
377: "by $uname in domain $udom.");
378: } elsif ($answer =~ "^ok") {
379: &logthis("$uname in $udom successfully changed their password ".
380: "on $server.");
381: } elsif ($answer =~ "^pwchange_failure") {
382: &logthis("$uname in $udom was unable to change their password ".
383: "on $server. The action was blocked by either lcpasswd ".
384: "or pwchange");
385: } elsif ($answer =~ "^non_authorized") {
386: &logthis("$uname in $udom did not get their password correct when ".
387: "attempting to change it on $server.");
388: } elsif ($answer =~ "^auth_mode_error") {
389: &logthis("$uname in $udom attempted to change their password despite ".
390: "not being locally or internally authenticated on $server.");
391: } elsif ($answer =~ "^unknown_user") {
392: &logthis("$uname in $udom attempted to change their password ".
393: "on $server but were unable to because $server is not ".
394: "their home server.");
395: } elsif ($answer =~ "^refused") {
396: &logthis("$server refused to change $uname in $udom password because ".
397: "it was sent an unencrypted request to change the password.");
398: }
399: return $answer;
400: }
401:
402: # ----------------------- Try to determine user's current authentication scheme
403:
404: sub queryauthenticate {
405: my ($uname,$udom)=@_;
406: if (($perlvar{'lonRole'} eq 'library') &&
407: ($udom eq $perlvar{'lonDefDomain'})) {
408: my $answer=reply("encrypt:currentauth:$udom:$uname",
409: $perlvar{'lonHostID'});
410: unless ($answer eq 'unknown_user' or $answer eq 'refused') {
411: if (length($answer)) {
412: return $answer;
413: }
414: else {
415: &logthis("User $uname at $udom lacks an authentication mechanism");
416: return 'no_host';
417: }
418: }
419: }
420:
421: my $tryserver;
422: foreach $tryserver (keys %libserv) {
423: if ($hostdom{$tryserver} eq $udom) {
424: my $answer=reply("encrypt:currentauth:$udom:$uname",$tryserver);
425: unless ($answer eq 'unknown_user' or $answer eq 'refused') {
426: if (length($answer)) {
427: return $answer;
428: }
429: else {
430: &logthis("User $uname at $udom lacks an authentication mechanism");
431: return 'no_host';
432: }
433: }
434: }
435: }
436: &logthis("User $uname at $udom lacks an authentication mechanism");
437: return 'no_host';
438: }
439:
440: # --------- Try to authenticate user from domain's lib servers (first this one)
441:
442: sub authenticate {
443: my ($uname,$upass,$udom)=@_;
444: $upass=escape($upass);
445: $uname=~s/\W//g;
446: if (($perlvar{'lonRole'} eq 'library') &&
447: ($udom eq $perlvar{'lonDefDomain'})) {
448: my $answer=reply("encrypt:auth:$udom:$uname:$upass",$perlvar{'lonHostID'});
449: if ($answer =~ /authorized/) {
450: if ($answer eq 'authorized') {
451: &logthis("User $uname at $udom authorized by local server");
452: return $perlvar{'lonHostID'};
453: }
454: if ($answer eq 'non_authorized') {
455: &logthis("User $uname at $udom rejected by local server");
456: return 'no_host';
457: }
458: }
459: }
460:
461: my $tryserver;
462: foreach $tryserver (keys %libserv) {
463: if ($hostdom{$tryserver} eq $udom) {
464: my $answer=reply("encrypt:auth:$udom:$uname:$upass",$tryserver);
465: if ($answer =~ /authorized/) {
466: if ($answer eq 'authorized') {
467: &logthis("User $uname at $udom authorized by $tryserver");
468: return $tryserver;
469: }
470: if ($answer eq 'non_authorized') {
471: &logthis("User $uname at $udom rejected by $tryserver");
472: return 'no_host';
473: }
474: }
475: }
476: }
477: &logthis("User $uname at $udom could not be authenticated");
478: return 'no_host';
479: }
480:
481: # ---------------------- Find the homebase for a user from domain's lib servers
482:
483: sub homeserver {
484: my ($uname,$udom)=@_;
485:
486: my $index="$uname:$udom";
487: if ($homecache{$index}) { return "$homecache{$index}"; }
488:
489: my $tryserver;
490: foreach $tryserver (keys %libserv) {
491: if ($hostdom{$tryserver} eq $udom) {
492: my $answer=reply("home:$udom:$uname",$tryserver);
493: if ($answer eq 'found') {
494: $homecache{$index}=$tryserver;
495: return $tryserver;
496: }
497: }
498: }
499: return 'no_host';
500: }
501:
502: # ------------------------------------- Find the usernames behind a list of IDs
503:
504: sub idget {
505: my ($udom,@ids)=@_;
506: my %returnhash=();
507:
508: my $tryserver;
509: foreach $tryserver (keys %libserv) {
510: if ($hostdom{$tryserver} eq $udom) {
511: my $idlist=join('&',@ids);
512: $idlist=~tr/A-Z/a-z/;
513: my $reply=&reply("idget:$udom:".$idlist,$tryserver);
514: my @answer=();
515: if (($reply ne 'con_lost') && ($reply!~/^error\:/)) {
516: @answer=split(/\&/,$reply);
517: } ;
518: my $i;
519: for ($i=0;$i<=$#ids;$i++) {
520: if ($answer[$i]) {
521: $returnhash{$ids[$i]}=$answer[$i];
522: }
523: }
524: }
525: }
526: return %returnhash;
527: }
528:
529: # ------------------------------------- Find the IDs behind a list of usernames
530:
531: sub idrget {
532: my ($udom,@unames)=@_;
533: my %returnhash=();
534: foreach (@unames) {
535: $returnhash{$_}=(&userenvironment($udom,$_,'id'))[1];
536: }
537: return %returnhash;
538: }
539:
540: # ------------------------------- Store away a list of names and associated IDs
541:
542: sub idput {
543: my ($udom,%ids)=@_;
544: my %servers=();
545: foreach (keys %ids) {
546: my $uhom=&homeserver($_,$udom);
547: if ($uhom ne 'no_host') {
548: my $id=&escape($ids{$_});
549: $id=~tr/A-Z/a-z/;
550: my $unam=&escape($_);
551: if ($servers{$uhom}) {
552: $servers{$uhom}.='&'.$id.'='.$unam;
553: } else {
554: $servers{$uhom}=$id.'='.$unam;
555: }
556: &critical('put:'.$udom.':'.$unam.':environment:id='.$id,$uhom);
557: }
558: }
559: foreach (keys %servers) {
560: &critical('idput:'.$udom.':'.$servers{$_},$_);
561: }
562: }
563:
564: # ------------------------------------- Find the section of student in a course
565:
566: sub usection {
567: my ($udom,$unam,$courseid)=@_;
568: $courseid=~s/\_/\//g;
569: $courseid=~s/^(\w)/\/$1/;
570: foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
571: &homeserver($unam,$udom)))) {
572: my ($key,$value)=split(/\=/,$_);
573: $key=&unescape($key);
574: if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
575: my $section=$1;
576: if ($key eq $courseid.'_st') { $section=''; }
577: my ($dummy,$end,$start)=split(/\_/,&unescape($value));
578: my $now=time;
579: my $notactive=0;
580: if ($start) {
581: if ($now<$start) { $notactive=1; }
582: }
583: if ($end) {
584: if ($now>$end) { $notactive=1; }
585: }
586: unless ($notactive) { return $section; }
587: }
588: }
589: return '-1';
590: }
591:
592: # ------------------------------------- Read an entry from a user's environment
593:
594: sub userenvironment {
595: my ($udom,$unam,@what)=@_;
596: my %returnhash=();
597: my @answer=split(/\&/,
598: &reply('get:'.$udom.':'.$unam.':environment:'.join('&',@what),
599: &homeserver($unam,$udom)));
600: my $i;
601: for ($i=0;$i<=$#what;$i++) {
602: $returnhash{$what[$i]}=&unescape($answer[$i]);
603: }
604: return %returnhash;
605: }
606:
607: # ----------------------------- Subscribe to a resource, return URL if possible
608:
609: sub subscribe {
610: my $fname=shift;
611: my $author=$fname;
612: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
613: my ($udom,$uname)=split(/\//,$author);
614: my $home=homeserver($uname,$udom);
615: if (($home eq 'no_host') || ($home eq $perlvar{'lonHostID'})) {
616: return 'not_found';
617: }
618: my $answer=reply("sub:$fname",$home);
619: if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
620: $answer.=' by '.$home;
621: }
622: return $answer;
623: }
624:
625: # -------------------------------------------------------------- Replicate file
626:
627: sub repcopy {
628: my $filename=shift;
629: $filename=~s/\/+/\//g;
630: if ($filename=~/^\/home\/httpd\/html\/adm\//) { return OK; }
631: my $transname="$filename.in.transfer";
632: if ((-e $filename) || (-e $transname)) { return OK; }
633: my $remoteurl=subscribe($filename);
634: if ($remoteurl =~ /^con_lost by/) {
635: &logthis("Subscribe returned $remoteurl: $filename");
636: return HTTP_SERVICE_UNAVAILABLE;
637: } elsif ($remoteurl eq 'not_found') {
638: &logthis("Subscribe returned not_found: $filename");
639: return HTTP_NOT_FOUND;
640: } elsif ($remoteurl =~ /^rejected by/) {
641: &logthis("Subscribe returned $remoteurl: $filename");
642: return FORBIDDEN;
643: } elsif ($remoteurl eq 'directory') {
644: return OK;
645: } else {
646: my @parts=split(/\//,$filename);
647: my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";
648: if ($path ne "$perlvar{'lonDocRoot'}/res") {
649: &logthis("Malconfiguration for replication: $filename");
650: return HTTP_BAD_REQUEST;
651: }
652: my $count;
653: for ($count=5;$count<$#parts;$count++) {
654: $path.="/$parts[$count]";
655: if ((-e $path)!=1) {
656: mkdir($path,0777);
657: }
658: }
659: my $ua=new LWP::UserAgent;
660: my $request=new HTTP::Request('GET',"$remoteurl");
661: my $response=$ua->request($request,$transname);
662: if ($response->is_error()) {
663: unlink($transname);
664: my $message=$response->status_line;
665: &logthis("<font color=blue>WARNING:"
666: ." LWP get: $message: $filename</font>");
667: return HTTP_SERVICE_UNAVAILABLE;
668: } else {
669: if ($remoteurl!~/\.meta$/) {
670: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
671: my $mresponse=$ua->request($mrequest,$filename.'.meta');
672: if ($mresponse->is_error()) {
673: unlink($filename.'.meta');
674: &logthis(
675: "<font color=yellow>INFO: No metadata: $filename</font>");
676: }
677: }
678: rename($transname,$filename);
679: return OK;
680: }
681: }
682: }
683:
684: # --------------------------------------------------------- Server Side Include
685:
686: sub ssi {
687:
688: my ($fn,%form)=@_;
689:
690: my $ua=new LWP::UserAgent;
691:
692: my $request;
693:
694: if (%form) {
695: $request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);
696: $request->content(join('&',map { &escape($_).'='.&escape($form{$_}) } keys %form));
697: } else {
698: $request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);
699: }
700:
701: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
702: my $response=$ua->request($request);
703:
704: return $response->content;
705: }
706:
707: # ------------------------------------------------------------------------- Log
708:
709: sub log {
710: my ($dom,$nam,$hom,$what)=@_;
711: return critical("log:$dom:$nam:$what",$hom);
712: }
713:
714: # ------------------------------------------------------------------ Course Log
715:
716: sub flushcourselogs {
717: &logthis('Flushing course log buffers');
718: foreach (keys %courselogs) {
719: my $crsid=$_;
720: if (&reply('log:'.$coursedombuf{$crsid}.':'.
721: &escape($courselogs{$crsid}),
722: $coursehombuf{$crsid}) eq 'ok') {
723: delete $courselogs{$crsid};
724: } else {
725: &logthis('Failed to flush log buffer for '.$crsid);
726: if (length($courselogs{$crsid})>40000) {
727: &logthis("<font color=blue>WARNING: Buffer for ".$crsid.
728: " exceeded maximum size, deleting.</font>");
729: delete $courselogs{$crsid};
730: }
731: }
732: }
733: &logthis('Flushing access logs');
734: foreach (keys %accesshash) {
735: my $entry=$_;
736: $entry=~/\_\_\_(\w+)\/(\w+)\/(.*)\_\_\_(\w+)$/;
737: my %temphash=($entry => $accesshash{$entry});
738: if (&Apache::lonnet::put('resevaldata',\%temphash,$1,$2) eq 'ok') {
739: delete $accesshash{$entry};
740: }
741: }
742: $dumpcount++;
743: }
744:
745: sub courselog {
746: my $what=shift;
747: $what=time.':'.$what;
748: unless ($ENV{'request.course.id'}) { return ''; }
749: $coursedombuf{$ENV{'request.course.id'}}=
750: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.
751: $ENV{'course.'.$ENV{'request.course.id'}.'.num'};
752: $coursehombuf{$ENV{'request.course.id'}}=
753: $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
754: if (defined $courselogs{$ENV{'request.course.id'}}) {
755: $courselogs{$ENV{'request.course.id'}}.='&'.$what;
756: } else {
757: $courselogs{$ENV{'request.course.id'}}.=$what;
758: }
759: if (length($courselogs{$ENV{'request.course.id'}})>4048) {
760: &flushcourselogs();
761: }
762: }
763:
764: sub courseacclog {
765: my $fnsymb=shift;
766: unless ($ENV{'request.course.id'}) { return ''; }
767: my $what=$fnsymb.':'.$ENV{'user.name'}.':'.$ENV{'user.domain'};
768: if ($fnsymb=~/(problem|exam|quiz|assess|survey|form)$/) {
769: $what.=':POST';
770: foreach (keys %ENV) {
771: if ($_=~/^form\.(.*)/) {
772: $what.=':'.$1.'='.$ENV{$_};
773: }
774: }
775: }
776: &courselog($what);
777: }
778:
779: sub countacc {
780: my $url=&declutter(shift);
781: unless ($ENV{'request.course.id'}) { return ''; }
782: $accesshash{$ENV{'request.course.id'}.'___'.$url.'___course'}=1;
783: my $key=$processmarker.'_'.$dumpcount.'___'.$url.'___count';
784: if (defined($accesshash{$key})) {
785: $accesshash{$key}++;
786: } else {
787: $accesshash{$key}=1;
788: }
789: }
790:
791: # ----------------------------------------------------------- Check out an item
792:
793: sub checkout {
794: my ($symb,$tuname,$tudom,$tcrsid)=@_;
795: my $now=time;
796: my $lonhost=$perlvar{'lonHostID'};
797: my $infostr=&escape(
798: $tuname.'&'.
799: $tudom.'&'.
800: $tcrsid.'&'.
801: $symb.'&'.
802: $now.'&'.$ENV{'REMOTE_ADDR'});
803: my $token=&reply('tmpput:'.$infostr,$lonhost);
804: if ($token=~/^error\:/) {
805: &logthis("<font color=blue>WARNING: ".
806: "Checkout tmpput failed ".$tudom.' - '.$tuname.' - '.$symb.
807: "</font>");
808: return '';
809: }
810:
811: $token=~s/^(\d+)\_.*\_(\d+)$/$1\*$2\*$lonhost/;
812: $token=~tr/a-z/A-Z/;
813:
814: my %infohash=('resource.0.outtoken' => $token,
815: 'resource.0.checkouttime' => $now,
816: 'resource.0.outremote' => $ENV{'REMOTE_ADDR'});
817:
818: unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
819: return '';
820: } else {
821: &logthis("<font color=blue>WARNING: ".
822: "Checkout cstore failed ".$tudom.' - '.$tuname.' - '.$symb.
823: "</font>");
824: }
825:
826: if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
827: &escape('Checkout '.$infostr.' - '.
828: $token)) ne 'ok') {
829: return '';
830: } else {
831: &logthis("<font color=blue>WARNING: ".
832: "Checkout log failed ".$tudom.' - '.$tuname.' - '.$symb.
833: "</font>");
834: }
835: return $token;
836: }
837:
838: # ------------------------------------------------------------ Check in an item
839:
840: sub checkin {
841: my $token=shift;
842: my $now=time;
843: my ($ta,$tb,$lonhost)=split(/\*/,$token);
844: $lonhost=~tr/A-Z/a-z/;
845: my $dtoken=$ta.'_'.$hostip{$lonhost}.'_'.$tb;
846: $dtoken=~s/\W/\_/g;
847: my ($tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=
848: split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));
849:
850: unless (($tuname) && ($tudom)) {
851: &logthis('Check in '.$token.' ('.$dtoken.') failed');
852: return '';
853: }
854:
855: unless (&allowed('mgr',$tcrsid)) {
856: &logthis('Check in '.$token.' ('.$dtoken.') unauthorized: '.
857: $ENV{'user.name'}.' - '.$ENV{'user.domain'});
858: return '';
859: }
860:
861: my %infohash=('resource.0.intoken' => $token,
862: 'resource.0.checkintime' => $now,
863: 'resource.0.inremote' => $ENV{'REMOTE_ADDR'});
864:
865: unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
866: return '';
867: }
868:
869: if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
870: &escape('Checkin - '.$token)) ne 'ok') {
871: return '';
872: }
873:
874: return ($symb,$tuname,$tudom,$tcrsid);
875: }
876:
877: # --------------------------------------------- Set Expire Date for Spreadsheet
878:
879: sub expirespread {
880: my ($uname,$udom,$stype,$usymb)=@_;
881: my $cid=$ENV{'request.course.id'};
882: if ($cid) {
883: my $now=time;
884: my $key=$uname.':'.$udom.':'.$stype.':'.$usymb;
885: return &reply('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
886: $ENV{'course.'.$cid.'.num'}.
887: ':nohist_expirationdates:'.
888: &escape($key).'='.$now,
889: $ENV{'course.'.$cid.'.home'})
890: }
891: return 'ok';
892: }
893:
894: # ----------------------------------------------------- Devalidate Spreadsheets
895:
896: sub devalidate {
897: my $symb=shift;
898: my $cid=$ENV{'request.course.id'};
899: if ($cid) {
900: my $key=$ENV{'user.name'}.':'.$ENV{'user.domain'}.':';
901: my $status=
902: &del('nohist_calculatedsheet',
903: [$key.'studentcalc'],
904: $ENV{'course.'.$cid.'.domain'},
905: $ENV{'course.'.$cid.'.num'})
906: .' '.
907: &del('nohist_calculatedsheets_'.$cid,
908: [$key.'assesscalc:'.$symb]);
909: unless ($status eq 'ok ok') {
910: &logthis('Could not devalidate spreadsheet '.
911: $ENV{'user.name'}.' at '.$ENV{'user.domain'}.' for '.
912: $symb.': '.$status);
913: }
914: }
915: }
916:
917: sub arrayref2str {
918: my ($arrayref) = @_;
919: my $result='_ARRAY_REF__';
920: foreach my $elem (@$arrayref) {
921: if (ref($elem) eq 'ARRAY') {
922: $result.=&escape(&arrayref2str($elem)).'&';
923: } elsif (ref($elem) eq 'HASH') {
924: $result.=&escape(&hashref2str($elem)).'&';
925: } elsif (ref($elem)) {
926: &logthis("Got a ref of ".(ref($elem))." skipping.");
927: } else {
928: $result.=&escape($elem).'&';
929: }
930: }
931: $result=~s/\&$//;
932: return $result;
933: }
934:
935: sub hash2str {
936: my (%hash) = @_;
937: my $result=&hashref2str(\%hash);
938: $result=~s/^_HASH_REF__//;
939: return $result;
940: }
941:
942: sub hashref2str {
943: my ($hashref)=@_;
944: my $result='_HASH_REF__';
945: foreach (keys(%$hashref)) {
946: if (ref($_) eq 'ARRAY') {
947: $result.=&escape(&arrayref2str($_)).'=';
948: } elsif (ref($_) eq 'HASH') {
949: $result.=&escape(&hashref2str($_)).'=';
950: } elsif (ref($_)) {
951: &logthis("Got a ref of ".(ref($_))." skipping.");
952: } else {
953: $result.=&escape($_).'=';
954: }
955:
956: if (ref($$hashref{$_}) eq 'ARRAY') {
957: $result.=&escape(&arrayref2str($$hashref{$_})).'&';
958: } elsif (ref($$hashref{$_}) eq 'HASH') {
959: $result.=&escape(&hashref2str($$hashref{$_})).'&';
960: } elsif (ref($$hashref{$_})) {
961: &logthis("Got a ref of ".(ref($$hashref{$_}))." skipping.");
962: } else {
963: $result.=&escape($$hashref{$_}).'&';
964: }
965: }
966: $result=~s/\&$//;
967: return $result;
968: }
969:
970: sub str2hash {
971: my ($string) = @_;
972: my %returnhash;
973: foreach (split(/\&/,$string)) {
974: my ($name,$value)=split(/\=/,$_);
975: $name=&unescape($name);
976: $value=&unescape($value);
977: if ($value =~ /^_HASH_REF__/) {
978: $value =~ s/^_HASH_REF__//;
979: my %hash=&str2hash($value);
980: $value=\%hash;
981: } elsif ($value =~ /^_ARRAY_REF__/) {
982: $value =~ s/^_ARRAY_REF__//;
983: my @array=&str2array($value);
984: $value=\@array;
985: }
986: $returnhash{$name}=$value;
987: }
988: return (%returnhash);
989: }
990:
991: sub str2array {
992: my ($string) = @_;
993: my @returnarray;
994: foreach my $value (split(/\&/,$string)) {
995: $value=&unescape($value);
996: if ($value =~ /^_HASH_REF__/) {
997: $value =~ s/^_HASH_REF__//;
998: my %hash=&str2hash($value);
999: $value=\%hash;
1000: } elsif ($value =~ /^_ARRAY_REF__/) {
1001: $value =~ s/^_ARRAY_REF__//;
1002: my @array=&str2array($value);
1003: $value=\@array;
1004: }
1005: push(@returnarray,$value);
1006: }
1007: return (@returnarray);
1008: }
1009:
1010: # -------------------------------------------------------------------Temp Store
1011:
1012: sub tmpreset {
1013: my ($symb,$namespace,$domain,$stuname) = @_;
1014: if (!$symb) {
1015: $symb=&symbread();
1016: if (!$symb) { $symb= $ENV{'REQUEST_URI'}; }
1017: }
1018: $symb=escape($symb);
1019:
1020: if (!$namespace) { $namespace=$ENV{'request.state'}; }
1021: $namespace=~s/\//\_/g;
1022: $namespace=~s/\W//g;
1023:
1024: #FIXME needs to do something for /pub resources
1025: if (!$domain) { $domain=$ENV{'user.domain'}; }
1026: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1027: my $path=$perlvar{'lonDaemons'}.'/tmp';
1028: my %hash;
1029: if (tie(%hash,'GDBM_File',
1030: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1031: &GDBM_WRCREAT,0640)) {
1032: foreach my $key (keys %hash) {
1033: if ($key=~ /:$symb/) {
1034: delete($hash{$key});
1035: }
1036: }
1037: }
1038: }
1039:
1040: sub tmpstore {
1041: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1042:
1043: if (!$symb) {
1044: $symb=&symbread();
1045: if (!$symb) { $symb= $ENV{'request.url'}; }
1046: }
1047: $symb=escape($symb);
1048:
1049: if (!$namespace) {
1050: # I don't think we would ever want to store this for a course.
1051: # it seems this will only be used if we don't have a course.
1052: #$namespace=$ENV{'request.course.id'};
1053: #if (!$namespace) {
1054: $namespace=$ENV{'request.state'};
1055: #}
1056: }
1057: $namespace=~s/\//\_/g;
1058: $namespace=~s/\W//g;
1059: #FIXME needs to do something for /pub resources
1060: if (!$domain) { $domain=$ENV{'user.domain'}; }
1061: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1062: my $now=time;
1063: my %hash;
1064: my $path=$perlvar{'lonDaemons'}.'/tmp';
1065: if (tie(%hash,'GDBM_File',
1066: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1067: &GDBM_WRCREAT,0640)) {
1068: $hash{"version:$symb"}++;
1069: my $version=$hash{"version:$symb"};
1070: my $allkeys='';
1071: foreach my $key (keys(%$storehash)) {
1072: $allkeys.=$key.':';
1073: $hash{"$version:$symb:$key"}=$$storehash{$key};
1074: }
1075: $hash{"$version:$symb:timestamp"}=$now;
1076: $allkeys.='timestamp';
1077: $hash{"$version:keys:$symb"}=$allkeys;
1078: if (untie(%hash)) {
1079: return 'ok';
1080: } else {
1081: return "error:$!";
1082: }
1083: } else {
1084: return "error:$!";
1085: }
1086: }
1087:
1088: # -----------------------------------------------------------------Temp Restore
1089:
1090: sub tmprestore {
1091: my ($symb,$namespace,$domain,$stuname) = @_;
1092:
1093: if (!$symb) {
1094: $symb=&symbread();
1095: if (!$symb) { $symb= $ENV{'request.url'}; }
1096: }
1097: $symb=escape($symb);
1098:
1099: if (!$namespace) { $namespace=$ENV{'request.state'}; }
1100: #FIXME needs to do something for /pub resources
1101: if (!$domain) { $domain=$ENV{'user.domain'}; }
1102: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1103:
1104: my %returnhash;
1105: $namespace=~s/\//\_/g;
1106: $namespace=~s/\W//g;
1107: my %hash;
1108: my $path=$perlvar{'lonDaemons'}.'/tmp';
1109: if (tie(%hash,'GDBM_File',
1110: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1111: &GDBM_READER,0640)) {
1112: my $version=$hash{"version:$symb"};
1113: $returnhash{'version'}=$version;
1114: my $scope;
1115: for ($scope=1;$scope<=$version;$scope++) {
1116: my $vkeys=$hash{"$scope:keys:$symb"};
1117: my @keys=split(/:/,$vkeys);
1118: my $key;
1119: $returnhash{"$scope:keys"}=$vkeys;
1120: foreach $key (@keys) {
1121: $returnhash{"$scope:$key"}=$hash{"$scope:$symb:$key"};
1122: $returnhash{"$key"}=$hash{"$scope:$symb:$key"};
1123: }
1124: }
1125: if (!(untie(%hash))) {
1126: return "error:$!";
1127: }
1128: } else {
1129: return "error:$!";
1130: }
1131: return %returnhash;
1132: }
1133:
1134: # ----------------------------------------------------------------------- Store
1135:
1136: sub store {
1137: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1138: my $home='';
1139:
1140: if ($stuname) { $home=&homeserver($stuname,$domain); }
1141:
1142: $symb=&symbclean($symb);
1143: if (!$symb) { unless ($symb=&symbread()) { return ''; } }
1144:
1145: &devalidate($symb);
1146:
1147: $symb=escape($symb);
1148: if (!$namespace) {
1149: unless ($namespace=$ENV{'request.course.id'}) {
1150: return '';
1151: }
1152: }
1153: if (!$domain) { $domain=$ENV{'user.domain'}; }
1154: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1155: if (!$home) { $home=$ENV{'user.home'}; }
1156: my $namevalue='';
1157: foreach (keys %$storehash) {
1158: $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
1159: }
1160: $namevalue=~s/\&$//;
1161: &courselog($symb.':'.$stuname.':'.$domain.':STORE:'.$namevalue);
1162: return reply("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
1163: }
1164:
1165: # -------------------------------------------------------------- Critical Store
1166:
1167: sub cstore {
1168: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1169: my $home='';
1170:
1171: if ($stuname) { $home=&homeserver($stuname,$domain); }
1172:
1173: $symb=&symbclean($symb);
1174: if (!$symb) { unless ($symb=&symbread()) { return ''; } }
1175:
1176: &devalidate($symb);
1177:
1178: $symb=escape($symb);
1179: if (!$namespace) {
1180: unless ($namespace=$ENV{'request.course.id'}) {
1181: return '';
1182: }
1183: }
1184: if (!$domain) { $domain=$ENV{'user.domain'}; }
1185: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1186: if (!$home) { $home=$ENV{'user.home'}; }
1187:
1188: my $namevalue='';
1189: foreach (keys %$storehash) {
1190: $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
1191: }
1192: $namevalue=~s/\&$//;
1193: &courselog($symb.':'.$stuname.':'.$domain.':CSTORE:'.$namevalue);
1194: return critical
1195: ("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
1196: }
1197:
1198: # --------------------------------------------------------------------- Restore
1199:
1200: sub restore {
1201: my ($symb,$namespace,$domain,$stuname) = @_;
1202: my $home='';
1203:
1204: if ($stuname) { $home=&homeserver($stuname,$domain); }
1205:
1206: if (!$symb) {
1207: unless ($symb=escape(&symbread())) { return ''; }
1208: } else {
1209: $symb=&escape(&symbclean($symb));
1210: }
1211: if (!$namespace) {
1212: unless ($namespace=$ENV{'request.course.id'}) {
1213: return '';
1214: }
1215: }
1216: if (!$domain) { $domain=$ENV{'user.domain'}; }
1217: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1218: if (!$home) { $home=$ENV{'user.home'}; }
1219: my $answer=&reply("restore:$domain:$stuname:$namespace:$symb","$home");
1220:
1221: my %returnhash=();
1222: foreach (split(/\&/,$answer)) {
1223: my ($name,$value)=split(/\=/,$_);
1224: $returnhash{&unescape($name)}=&unescape($value);
1225: }
1226: my $version;
1227: for ($version=1;$version<=$returnhash{'version'};$version++) {
1228: foreach (split(/\:/,$returnhash{$version.':keys'})) {
1229: $returnhash{$_}=$returnhash{$version.':'.$_};
1230: }
1231: }
1232: return %returnhash;
1233: }
1234:
1235: # ---------------------------------------------------------- Course Description
1236:
1237: sub coursedescription {
1238: my $courseid=shift;
1239: $courseid=~s/^\///;
1240: $courseid=~s/\_/\//g;
1241: my ($cdomain,$cnum)=split(/\//,$courseid);
1242: my $chome=&homeserver($cnum,$cdomain);
1243: if ($chome ne 'no_host') {
1244: my %returnhash=&dump('environment',$cdomain,$cnum);
1245: if (!exists($returnhash{'con_lost'})) {
1246: my $normalid=$cdomain.'_'.$cnum;
1247: my %envhash=();
1248: $returnhash{'home'}= $chome;
1249: $returnhash{'domain'} = $cdomain;
1250: $returnhash{'num'} = $cnum;
1251: while (my ($name,$value) = each %returnhash) {
1252: $envhash{'course.'.$normalid.'.'.$name}=$value;
1253: }
1254: $returnhash{'url'}='/res/'.declutter($returnhash{'url'});
1255: $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
1256: $ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
1257: $envhash{'course.'.$normalid.'.last_cache'}=time;
1258: $envhash{'course.'.$normalid.'.home'}=$chome;
1259: $envhash{'course.'.$normalid.'.domain'}=$cdomain;
1260: $envhash{'course.'.$normalid.'.num'}=$cnum;
1261: &appenv(%envhash);
1262: return %returnhash;
1263: }
1264: }
1265: return ();
1266: }
1267:
1268: # -------------------------------------------------------- Get user privileges
1269:
1270: sub rolesinit {
1271: my ($domain,$username,$authhost)=@_;
1272: my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
1273: if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return ''; }
1274: my %allroles=();
1275: my %thesepriv=();
1276: my $now=time;
1277: my $userroles="user.login.time=$now\n";
1278: my $thesestr;
1279:
1280: if ($rolesdump ne '') {
1281: foreach (split(/&/,$rolesdump)) {
1282: if ($_!~/^rolesdef\&/) {
1283: my ($area,$role)=split(/=/,$_);
1284: $area=~s/\_\w\w$//;
1285: my ($trole,$tend,$tstart)=split(/_/,$role);
1286: $userroles.='user.role.'.$trole.'.'.$area.'='.
1287: $tstart.'.'.$tend."\n";
1288: if ($tend!=0) {
1289: if ($tend<$now) {
1290: $trole='';
1291: }
1292: }
1293: if ($tstart!=0) {
1294: if ($tstart>$now) {
1295: $trole='';
1296: }
1297: }
1298: if (($area ne '') && ($trole ne '')) {
1299: my $spec=$trole.'.'.$area;
1300: my ($tdummy,$tdomain,$trest)=split(/\//,$area);
1301: if ($trole =~ /^cr\//) {
1302: my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
1303: my $homsvr=homeserver($rauthor,$rdomain);
1304: if ($hostname{$homsvr} ne '') {
1305: my $roledef=
1306: reply("get:$rdomain:$rauthor:roles:rolesdef_$rrole",
1307: $homsvr);
1308: if (($roledef ne 'con_lost') && ($roledef ne '')) {
1309: my ($syspriv,$dompriv,$coursepriv)=
1310: split(/\_/,unescape($roledef));
1311: $allroles{'cm./'}.=':'.$syspriv;
1312: $allroles{$spec.'./'}.=':'.$syspriv;
1313: if ($tdomain ne '') {
1314: $allroles{'cm./'.$tdomain.'/'}.=':'.$dompriv;
1315: $allroles{$spec.'./'.$tdomain.'/'}.=':'.$dompriv;
1316: if ($trest ne '') {
1317: $allroles{'cm.'.$area}.=':'.$coursepriv;
1318: $allroles{$spec.'.'.$area}.=':'.$coursepriv;
1319: }
1320: }
1321: }
1322: }
1323: } else {
1324: $allroles{'cm./'}.=':'.$pr{$trole.':s'};
1325: $allroles{$spec.'./'}.=':'.$pr{$trole.':s'};
1326: if ($tdomain ne '') {
1327: $allroles{'cm./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
1328: $allroles{$spec.'./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
1329: if ($trest ne '') {
1330: $allroles{'cm.'.$area}.=':'.$pr{$trole.':c'};
1331: $allroles{$spec.'.'.$area}.=':'.$pr{$trole.':c'};
1332: }
1333: }
1334: }
1335: }
1336: }
1337: }
1338: my $adv=0;
1339: my $author=0;
1340: foreach (keys %allroles) {
1341: %thesepriv=();
1342: if (($_!~/^st/) && ($_!~/^ta/) && ($_!~/^cm/)) { $adv=1; }
1343: if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }
1344: foreach (split(/:/,$allroles{$_})) {
1345: if ($_ ne '') {
1346: my ($privilege,$restrictions)=split(/&/,$_);
1347: if ($restrictions eq '') {
1348: $thesepriv{$privilege}='F';
1349: } else {
1350: if ($thesepriv{$privilege} ne 'F') {
1351: $thesepriv{$privilege}.=$restrictions;
1352: }
1353: }
1354: }
1355: }
1356: $thesestr='';
1357: foreach (keys %thesepriv) { $thesestr.=':'.$_.'&'.$thesepriv{$_}; }
1358: $userroles.='user.priv.'.$_.'='.$thesestr."\n";
1359: }
1360: $userroles.='user.adv='.$adv."\n".
1361: 'user.author='.$author."\n";
1362: $ENV{'user.adv'}=$adv;
1363: }
1364: return $userroles;
1365: }
1366:
1367: # --------------------------------------------------------------- get interface
1368:
1369: sub get {
1370: my ($namespace,$storearr,$udomain,$uname)=@_;
1371: my $items='';
1372: foreach (@$storearr) {
1373: $items.=escape($_).'&';
1374: }
1375: $items=~s/\&$//;
1376: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1377: if (!$uname) { $uname=$ENV{'user.name'}; }
1378: my $uhome=&homeserver($uname,$udomain);
1379:
1380: my $rep=&reply("get:$udomain:$uname:$namespace:$items",$uhome);
1381: my @pairs=split(/\&/,$rep);
1382: my %returnhash=();
1383: my $i=0;
1384: foreach (@$storearr) {
1385: $returnhash{$_}=unescape($pairs[$i]);
1386: $i++;
1387: }
1388: return %returnhash;
1389: }
1390:
1391: # --------------------------------------------------------------- del interface
1392:
1393: sub del {
1394: my ($namespace,$storearr,$udomain,$uname)=@_;
1395: my $items='';
1396: foreach (@$storearr) {
1397: $items.=escape($_).'&';
1398: }
1399: $items=~s/\&$//;
1400: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1401: if (!$uname) { $uname=$ENV{'user.name'}; }
1402: my $uhome=&homeserver($uname,$udomain);
1403:
1404: return &reply("del:$udomain:$uname:$namespace:$items",$uhome);
1405: }
1406:
1407: # -------------------------------------------------------------- dump interface
1408:
1409: sub dump {
1410: my ($namespace,$udomain,$uname,$regexp)=@_;
1411: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1412: if (!$uname) { $uname=$ENV{'user.name'}; }
1413: my $uhome=&homeserver($uname,$udomain);
1414: if ($regexp) {
1415: $regexp=&escape($regexp);
1416: } else {
1417: $regexp='.';
1418: }
1419: my $rep=reply("dump:$udomain:$uname:$namespace:$regexp",$uhome);
1420: my @pairs=split(/\&/,$rep);
1421: my %returnhash=();
1422: foreach (@pairs) {
1423: my ($key,$value)=split(/=/,$_);
1424: $returnhash{unescape($key)}=unescape($value);
1425: }
1426: return %returnhash;
1427: }
1428:
1429: # --------------------------------------------------------------- put interface
1430:
1431: sub put {
1432: my ($namespace,$storehash,$udomain,$uname)=@_;
1433: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1434: if (!$uname) { $uname=$ENV{'user.name'}; }
1435: my $uhome=&homeserver($uname,$udomain);
1436: my $items='';
1437: foreach (keys %$storehash) {
1438: $items.=&escape($_).'='.&escape($$storehash{$_}).'&';
1439: }
1440: $items=~s/\&$//;
1441: return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
1442: }
1443:
1444: # ------------------------------------------------------ critical put interface
1445:
1446: sub cput {
1447: my ($namespace,$storehash,$udomain,$uname)=@_;
1448: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1449: if (!$uname) { $uname=$ENV{'user.name'}; }
1450: my $uhome=&homeserver($uname,$udomain);
1451: my $items='';
1452: foreach (keys %$storehash) {
1453: $items.=escape($_).'='.escape($$storehash{$_}).'&';
1454: }
1455: $items=~s/\&$//;
1456: return &critical("put:$udomain:$uname:$namespace:$items",$uhome);
1457: }
1458:
1459: # -------------------------------------------------------------- eget interface
1460:
1461: sub eget {
1462: my ($namespace,$storearr,$udomain,$uname)=@_;
1463: my $items='';
1464: foreach (@$storearr) {
1465: $items.=escape($_).'&';
1466: }
1467: $items=~s/\&$//;
1468: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1469: if (!$uname) { $uname=$ENV{'user.name'}; }
1470: my $uhome=&homeserver($uname,$udomain);
1471: my $rep=&reply("eget:$udomain:$uname:$namespace:$items",$uhome);
1472: my @pairs=split(/\&/,$rep);
1473: my %returnhash=();
1474: my $i=0;
1475: foreach (@$storearr) {
1476: $returnhash{$_}=unescape($pairs[$i]);
1477: $i++;
1478: }
1479: return %returnhash;
1480: }
1481:
1482: # ------------------------------------------------- Check for a user privilege
1483:
1484: sub allowed {
1485: my ($priv,$uri)=@_;
1486:
1487: my $orguri=$uri;
1488: $uri=&declutter($uri);
1489:
1490: # Free bre access to adm and meta resources
1491:
1492: if ((($uri=~/^adm\//) || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {
1493: return 'F';
1494: }
1495:
1496: # Free bre to public access
1497:
1498: if ($priv eq 'bre') {
1499: if (&metadata($uri,'copyright') eq 'public') { return 'F'; }
1500: }
1501:
1502: my $thisallowed='';
1503: my $statecond=0;
1504: my $courseprivid='';
1505:
1506: # Course
1507:
1508: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'}=~/$priv\&([^\:]*)/) {
1509: $thisallowed.=$1;
1510: }
1511:
1512: # Domain
1513:
1514: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
1515: =~/$priv\&([^\:]*)/) {
1516: $thisallowed.=$1;
1517: }
1518:
1519: # Course: uri itself is a course
1520: my $courseuri=$uri;
1521: $courseuri=~s/\_(\d)/\/$1/;
1522: $courseuri=~s/^([^\/])/\/$1/;
1523:
1524: if ($ENV{'user.priv.'.$ENV{'request.role'}.'.'.$courseuri}
1525: =~/$priv\&([^\:]*)/) {
1526: $thisallowed.=$1;
1527: }
1528:
1529: # Full access at system, domain or course-wide level? Exit.
1530:
1531: if ($thisallowed=~/F/) {
1532: return 'F';
1533: }
1534:
1535: # If this is generating or modifying users, exit with special codes
1536:
1537: if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:cca:'=~/\:$priv\:/) {
1538: return $thisallowed;
1539: }
1540: #
1541: # Gathered so far: system, domain and course wide privileges
1542: #
1543: # Course: See if uri or referer is an individual resource that is part of
1544: # the course
1545:
1546: if ($ENV{'request.course.id'}) {
1547: $courseprivid=$ENV{'request.course.id'};
1548: if ($ENV{'request.course.sec'}) {
1549: $courseprivid.='/'.$ENV{'request.course.sec'};
1550: }
1551: $courseprivid=~s/\_/\//;
1552: my $checkreferer=1;
1553: my @uriparts=split(/\//,$uri);
1554: my $filename=$uriparts[$#uriparts];
1555: my $pathname=$uri;
1556: $pathname=~s/\/$filename$//;
1557: if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
1558: /\&$filename\:([\d\|]+)\&/) {
1559: $statecond=$1;
1560: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
1561: =~/$priv\&([^\:]*)/) {
1562: $thisallowed.=$1;
1563: $checkreferer=0;
1564: }
1565: }
1566:
1567: if ($checkreferer) {
1568: my $refuri=$ENV{'httpref.'.$orguri};
1569:
1570: unless ($refuri) {
1571: foreach (keys %ENV) {
1572: if ($_=~/^httpref\..*\*/) {
1573: my $pattern=$_;
1574: $pattern=~s/^httpref\.\/res\///;
1575: $pattern=~s/\*/\[\^\/\]\+/g;
1576: $pattern=~s/\//\\\//g;
1577: if ($orguri=~/$pattern/) {
1578: $refuri=$ENV{$_};
1579: }
1580: }
1581: }
1582: }
1583: if ($refuri) {
1584: $refuri=&declutter($refuri);
1585: my @uriparts=split(/\//,$refuri);
1586: my $filename=$uriparts[$#uriparts];
1587: my $pathname=$refuri;
1588: $pathname=~s/\/$filename$//;
1589: if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
1590: /\&$filename\:([\d\|]+)\&/) {
1591: my $refstatecond=$1;
1592: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
1593: =~/$priv\&([^\:]*)/) {
1594: $thisallowed.=$1;
1595: $uri=$refuri;
1596: $statecond=$refstatecond;
1597: }
1598: }
1599: }
1600: }
1601: }
1602:
1603: #
1604: # Gathered now: all privileges that could apply, and condition number
1605: #
1606: #
1607: # Full or no access?
1608: #
1609:
1610: if ($thisallowed=~/F/) {
1611: return 'F';
1612: }
1613:
1614: unless ($thisallowed) {
1615: return '';
1616: }
1617:
1618: # Restrictions exist, deal with them
1619: #
1620: # C:according to course preferences
1621: # R:according to resource settings
1622: # L:unless locked
1623: # X:according to user session state
1624: #
1625:
1626: # Possibly locked functionality, check all courses
1627: # Locks might take effect only after 10 minutes cache expiration for other
1628: # courses, and 2 minutes for current course
1629:
1630: my $envkey;
1631: if ($thisallowed=~/L/) {
1632: foreach $envkey (keys %ENV) {
1633: if ($envkey=~/^user\.role\.(st|ta)\.([^\.]*)/) {
1634: my $courseid=$2;
1635: my $roleid=$1.'.'.$2;
1636: $courseid=~s/^\///;
1637: my $expiretime=600;
1638: if ($ENV{'request.role'} eq $roleid) {
1639: $expiretime=120;
1640: }
1641: my ($cdom,$cnum,$csec)=split(/\//,$courseid);
1642: my $prefix='course.'.$cdom.'_'.$cnum.'.';
1643: if ((time-$ENV{$prefix.'last_cache'})>$expiretime) {
1644: &coursedescription($courseid);
1645: }
1646: if (($ENV{$prefix.'res.'.$uri.'.lock.sections'}=~/\,$csec\,/)
1647: || ($ENV{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {
1648: if ($ENV{$prefix.'res.'.$uri.'.lock.expire'}>time) {
1649: &log($ENV{'user.domain'},$ENV{'user.name'},
1650: $ENV{'user.host'},
1651: 'Locked by res: '.$priv.' for '.$uri.' due to '.
1652: $cdom.'/'.$cnum.'/'.$csec.' expire '.
1653: $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
1654: return '';
1655: }
1656: }
1657: if (($ENV{$prefix.'priv.'.$priv.'.lock.sections'}=~/\,$csec\,/)
1658: || ($ENV{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {
1659: if ($ENV{'priv.'.$priv.'.lock.expire'}>time) {
1660: &log($ENV{'user.domain'},$ENV{'user.name'},
1661: $ENV{'user.host'},
1662: 'Locked by priv: '.$priv.' for '.$uri.' due to '.
1663: $cdom.'/'.$cnum.'/'.$csec.' expire '.
1664: $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
1665: return '';
1666: }
1667: }
1668: }
1669: }
1670: }
1671:
1672: #
1673: # Rest of the restrictions depend on selected course
1674: #
1675:
1676: unless ($ENV{'request.course.id'}) {
1677: return '1';
1678: }
1679:
1680: #
1681: # Now user is definitely in a course
1682: #
1683:
1684:
1685: # Course preferences
1686:
1687: if ($thisallowed=~/C/) {
1688: my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
1689: if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.roles.denied'}
1690: =~/$rolecode/) {
1691: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
1692: 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.
1693: $ENV{'request.course.id'});
1694: return '';
1695: }
1696: }
1697:
1698: # Resource preferences
1699:
1700: if ($thisallowed=~/R/) {
1701: my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
1702: my $filename=$perlvar{'lonDocRoot'}.'/res/'.$uri.'.meta';
1703: if (-e $filename) {
1704: my @content;
1705: {
1706: my $fh=Apache::File->new($filename);
1707: @content=<$fh>;
1708: }
1709: if (join('',@content)=~
1710: /\<roledeny[^\>]*\>[^\<]*$rolecode[^\<]*\<\/roledeny\>/) {
1711: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
1712: 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);
1713: return '';
1714:
1715: }
1716: }
1717: }
1718:
1719: # Restricted by state?
1720:
1721: if ($thisallowed=~/X/) {
1722: if (&condval($statecond)) {
1723: return '2';
1724: } else {
1725: return '';
1726: }
1727: }
1728:
1729: return 'F';
1730: }
1731:
1732: # ----------------------------------------------------------------- Define Role
1733:
1734: sub definerole {
1735: if (allowed('mcr','/')) {
1736: my ($rolename,$sysrole,$domrole,$courole)=@_;
1737: foreach (split('/',$sysrole)) {
1738: my ($crole,$cqual)=split(/\&/,$_);
1739: if ($pr{'cr:s'}!~/$crole/) { return "refused:s:$crole"; }
1740: if ($pr{'cr:s'}=~/$crole\&/) {
1741: if ($pr{'cr:s'}!~/$crole\&\w*$cqual/) {
1742: return "refused:s:$crole&$cqual";
1743: }
1744: }
1745: }
1746: foreach (split('/',$domrole)) {
1747: my ($crole,$cqual)=split(/\&/,$_);
1748: if ($pr{'cr:d'}!~/$crole/) { return "refused:d:$crole"; }
1749: if ($pr{'cr:d'}=~/$crole\&/) {
1750: if ($pr{'cr:d'}!~/$crole\&\w*$cqual/) {
1751: return "refused:d:$crole&$cqual";
1752: }
1753: }
1754: }
1755: foreach (split('/',$courole)) {
1756: my ($crole,$cqual)=split(/\&/,$_);
1757: if ($pr{'cr:c'}!~/$crole/) { return "refused:c:$crole"; }
1758: if ($pr{'cr:c'}=~/$crole\&/) {
1759: if ($pr{'cr:c'}!~/$crole\&\w*$cqual/) {
1760: return "refused:c:$crole&$cqual";
1761: }
1762: }
1763: }
1764: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
1765: "$ENV{'user.domain'}:$ENV{'user.name'}:".
1766: "rolesdef_$rolename=".
1767: escape($sysrole.'_'.$domrole.'_'.$courole);
1768: return reply($command,$ENV{'user.home'});
1769: } else {
1770: return 'refused';
1771: }
1772: }
1773:
1774: # ---------------- Make a metadata query against the network of library servers
1775:
1776: sub metadata_query {
1777: my ($query,$custom,$customshow)=@_;
1778: my %rhash;
1779: for my $server (keys %libserv) {
1780: unless ($custom or $customshow) {
1781: my $reply=&reply("querysend:".&escape($query),$server);
1782: $rhash{$server}=$reply;
1783: }
1784: else {
1785: my $reply=&reply("querysend:".&escape($query).':'.
1786: &escape($custom).':'.&escape($customshow),
1787: $server);
1788: $rhash{$server}=$reply;
1789: }
1790: }
1791: return \%rhash;
1792: }
1793:
1794: # ------------------------------------------------------------------ Plain Text
1795:
1796: sub plaintext {
1797: my $short=shift;
1798: return $prp{$short};
1799: }
1800:
1801: # ----------------------------------------------------------------- Assign Role
1802:
1803: sub assignrole {
1804: my ($udom,$uname,$url,$role,$end,$start)=@_;
1805: my $mrole;
1806: if ($role =~ /^cr\//) {
1807: unless (&allowed('ccr',$url)) {
1808: &logthis('Refused custom assignrole: '.
1809: $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
1810: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
1811: return 'refused';
1812: }
1813: $mrole='cr';
1814: } else {
1815: my $cwosec=$url;
1816: $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
1817: unless (&allowed('c'.$role,$cwosec)) {
1818: &logthis('Refused assignrole: '.
1819: $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
1820: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
1821: return 'refused';
1822: }
1823: $mrole=$role;
1824: }
1825: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
1826: "$udom:$uname:$url".'_'."$mrole=$role";
1827: if ($end) { $command.='_'.$end; }
1828: if ($start) {
1829: if ($end) {
1830: $command.='_'.$start;
1831: } else {
1832: $command.='_0_'.$start;
1833: }
1834: }
1835: return &reply($command,&homeserver($uname,$udom));
1836: }
1837:
1838: # -------------------------------------------------- Modify user authentication
1839: # Overrides without validation
1840:
1841: sub modifyuserauth {
1842: my ($udom,$uname,$umode,$upass)=@_;
1843: my $uhome=&homeserver($uname,$udom);
1844: unless (&allowed('mau',$udom)) { return 'refused'; }
1845: &logthis('Call to modify user authentication '.$udom.', '.$uname.', '.
1846: $umode.' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'});
1847: my $reply=&reply('encrypt:changeuserauth:'.$udom.':'.$uname.':'.$umode.':'.
1848: &escape($upass),$uhome);
1849: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},
1850: 'Authentication changed for '.$udom.', '.$uname.', '.$umode.
1851: '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
1852: &log($udom,,$uname,$uhome,
1853: 'Authentication changed by '.$ENV{'user.domain'}.', '.
1854: $ENV{'user.name'}.', '.$umode.
1855: '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
1856: unless ($reply eq 'ok') {
1857: &logthis('Authentication mode error: '.$reply);
1858: return 'error: '.$reply;
1859: }
1860: return 'ok';
1861: }
1862:
1863: # --------------------------------------------------------------- Modify a user
1864:
1865: sub modifyuser {
1866: my ($udom, $uname, $uid,
1867: $umode, $upass, $first,
1868: $middle, $last, $gene,
1869: $forceid, $desiredhome)=@_;
1870: $udom=~s/\W//g;
1871: $uname=~s/\W//g;
1872: &logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.
1873: $umode.', '.$first.', '.$middle.', '.
1874: $last.', '.$gene.'(forceid: '.$forceid.')'.
1875: (defined($desiredhome) ? ' desiredhome = '.$desiredhome :
1876: ' desiredhome not specified').
1877: ' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'});
1878: my $uhome=&homeserver($uname,$udom);
1879: # ----------------------------------------------------------------- Create User
1880: if (($uhome eq 'no_host') && ($umode) && ($upass)) {
1881: my $unhome='';
1882: if (defined($desiredhome) && $hostdom{$desiredhome} eq $udom) {
1883: $unhome = $desiredhome;
1884: } elsif($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $udom) {
1885: $unhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
1886: } else { # load balancing routine for determining $unhome
1887: my $tryserver;
1888: my $loadm=10000000;
1889: foreach $tryserver (keys %libserv) {
1890: if ($hostdom{$tryserver} eq $udom) {
1891: my $answer=reply('load',$tryserver);
1892: if (($answer=~/\d+/) && ($answer<$loadm)) {
1893: $loadm=$answer;
1894: $unhome=$tryserver;
1895: }
1896: }
1897: }
1898: }
1899: if (($unhome eq '') || ($unhome eq 'no_host')) {
1900: return 'error: unable to find a home server for '.$uname.
1901: ' in domain '.$udom;
1902: }
1903: my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':'.$umode.':'.
1904: &escape($upass),$unhome);
1905: unless ($reply eq 'ok') {
1906: return 'error: '.$reply;
1907: }
1908: $uhome=&homeserver($uname,$udom);
1909: if (($uhome eq '') || ($uhome eq 'no_host') || ($uhome ne $unhome)) {
1910: return 'error: verify home';
1911: }
1912: } # End of creation of new user
1913: # ---------------------------------------------------------------------- Add ID
1914: if ($uid) {
1915: $uid=~tr/A-Z/a-z/;
1916: my %uidhash=&idrget($udom,$uname);
1917: if (($uidhash{$uname}) && ($uidhash{$uname}!~/error\:/)
1918: && (!$forceid)) {
1919: unless ($uid eq $uidhash{$uname}) {
1920: return 'error: mismatch '.$uidhash{$uname}.' versus '.$uid;
1921: }
1922: } else {
1923: &idput($udom,($uname => $uid));
1924: }
1925: }
1926: # -------------------------------------------------------------- Add names, etc
1927: my %names=&get('environment',
1928: ['firstname','middlename','lastname','generation'],
1929: $udom,$uname);
1930: if ($names{'firstname'} =~ m/^error:.*/) { %names=(); }
1931: if ($first) { $names{'firstname'} = $first; }
1932: if ($middle) { $names{'middlename'} = $middle; }
1933: if ($last) { $names{'lastname'} = $last; }
1934: if ($gene) { $names{'generation'} = $gene; }
1935: my $reply = &put('environment', \%names, $udom,$uname);
1936: if ($reply ne 'ok') { return 'error: '.$reply; }
1937: &logthis('Success modifying user '.$udom.', '.$uname.', '.$uid.', '.
1938: $umode.', '.$first.', '.$middle.', '.
1939: $last.', '.$gene.' by '.
1940: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
1941: return 'ok';
1942: }
1943:
1944: # -------------------------------------------------------------- Modify student
1945:
1946: sub modifystudent {
1947: my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,
1948: $end,$start,$forceid,$desiredhome)=@_;
1949: my $cid='';
1950: unless ($cid=$ENV{'request.course.id'}) {
1951: return 'not_in_class';
1952: }
1953: # --------------------------------------------------------------- Make the user
1954: my $reply=&modifyuser
1955: ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$forceid,
1956: $desiredhome);
1957: unless ($reply eq 'ok') { return $reply; }
1958: my $uhome=&homeserver($uname,$udom);
1959: if (($uhome eq '') || ($uhome eq 'no_host')) {
1960: return 'error: no such user';
1961: }
1962: # -------------------------------------------------- Add student to course list
1963: $reply=critical('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
1964: $ENV{'course.'.$cid.'.num'}.':classlist:'.
1965: &escape($uname.':'.$udom).'='.
1966: &escape($end.':'.$start),
1967: $ENV{'course.'.$cid.'.home'});
1968: unless (($reply eq 'ok') || ($reply eq 'delayed')) {
1969: return 'error: '.$reply;
1970: }
1971: # ---------------------------------------------------- Add student role to user
1972: my $uurl='/'.$cid;
1973: $uurl=~s/\_/\//g;
1974: if ($usec) {
1975: $uurl.='/'.$usec;
1976: }
1977: return &assignrole($udom,$uname,$uurl,'st',$end,$start);
1978: }
1979:
1980: # ------------------------------------------------- Write to course preferences
1981:
1982: sub writecoursepref {
1983: my ($courseid,%prefs)=@_;
1984: $courseid=~s/^\///;
1985: $courseid=~s/\_/\//g;
1986: my ($cdomain,$cnum)=split(/\//,$courseid);
1987: my $chome=homeserver($cnum,$cdomain);
1988: if (($chome eq '') || ($chome eq 'no_host')) {
1989: return 'error: no such course';
1990: }
1991: my $cstring='';
1992: foreach (keys %prefs) {
1993: $cstring.=escape($_).'='.escape($prefs{$_}).'&';
1994: }
1995: $cstring=~s/\&$//;
1996: return reply('put:'.$cdomain.':'.$cnum.':environment:'.$cstring,$chome);
1997: }
1998:
1999: # ---------------------------------------------------------- Make/modify course
2000:
2001: sub createcourse {
2002: my ($udom,$description,$url)=@_;
2003: $url=&declutter($url);
2004: my $cid='';
2005: unless (&allowed('ccc',$ENV{'user.domain'})) {
2006: return 'refused';
2007: }
2008: unless ($udom eq $ENV{'user.domain'}) {
2009: return 'refused';
2010: }
2011: # ------------------------------------------------------------------- Create ID
2012: my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
2013: unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
2014: # ----------------------------------------------- Make sure that does not exist
2015: my $uhome=&homeserver($uname,$udom);
2016: unless (($uhome eq '') || ($uhome eq 'no_host')) {
2017: $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
2018: unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
2019: $uhome=&homeserver($uname,$udom);
2020: unless (($uhome eq '') || ($uhome eq 'no_host')) {
2021: return 'error: unable to generate unique course-ID';
2022: }
2023: }
2024: # ------------------------------------------------------------- Make the course
2025: my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
2026: $ENV{'user.home'});
2027: unless ($reply eq 'ok') { return 'error: '.$reply; }
2028: $uhome=&homeserver($uname,$udom);
2029: if (($uhome eq '') || ($uhome eq 'no_host')) {
2030: return 'error: no such course';
2031: }
2032: &writecoursepref($udom.'_'.$uname,
2033: ('description' => $description,
2034: 'url' => $url));
2035: return '/'.$udom.'/'.$uname;
2036: }
2037:
2038: # ---------------------------------------------------------- Assign Custom Role
2039:
2040: sub assigncustomrole {
2041: my ($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start)=@_;
2042: return &assignrole($udom,$uname,$url,'cr/'.$rdom.'/'.$rnam.'/'.$rolename,
2043: $end,$start);
2044: }
2045:
2046: # ----------------------------------------------------------------- Revoke Role
2047:
2048: sub revokerole {
2049: my ($udom,$uname,$url,$role)=@_;
2050: my $now=time;
2051: return &assignrole($udom,$uname,$url,$role,$now);
2052: }
2053:
2054: # ---------------------------------------------------------- Revoke Custom Role
2055:
2056: sub revokecustomrole {
2057: my ($udom,$uname,$url,$rdom,$rnam,$rolename)=@_;
2058: my $now=time;
2059: return &assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$now);
2060: }
2061:
2062: # ------------------------------------------------------------ Directory lister
2063:
2064: sub dirlist {
2065: my $uri=shift;
2066: $uri=~s/^\///;
2067: $uri=~s/\/$//;
2068: my ($res,$udom,$uname,@rest)=split(/\//,$uri);
2069: if ($udom) {
2070: if ($uname) {
2071: my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/'.$uri,
2072: homeserver($uname,$udom));
2073: return split(/:/,$listing);
2074: } else {
2075: my $tryserver;
2076: my %allusers=();
2077: foreach $tryserver (keys %libserv) {
2078: if ($hostdom{$tryserver} eq $udom) {
2079: my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.$udom,
2080: $tryserver);
2081: if (($listing ne 'no_such_dir') && ($listing ne 'empty')
2082: && ($listing ne 'con_lost')) {
2083: foreach (split(/:/,$listing)) {
2084: my ($entry,@stat)=split(/&/,$_);
2085: $allusers{$entry}=1;
2086: }
2087: }
2088: }
2089: }
2090: my $alluserstr='';
2091: foreach (sort keys %allusers) {
2092: $alluserstr.=$_.'&user:';
2093: }
2094: $alluserstr=~s/:$//;
2095: return split(/:/,$alluserstr);
2096: }
2097: } else {
2098: my $tryserver;
2099: my %alldom=();
2100: foreach $tryserver (keys %libserv) {
2101: $alldom{$hostdom{$tryserver}}=1;
2102: }
2103: my $alldomstr='';
2104: foreach (sort keys %alldom) {
2105: $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
2106: }
2107: $alldomstr=~s/:$//;
2108: return split(/:/,$alldomstr);
2109: }
2110: }
2111:
2112: # -------------------------------------------------------- Value of a Condition
2113:
2114: sub directcondval {
2115: my $number=shift;
2116: if ($ENV{'user.state.'.$ENV{'request.course.id'}}) {
2117: return substr($ENV{'user.state.'.$ENV{'request.course.id'}},$number,1);
2118: } else {
2119: return 2;
2120: }
2121: }
2122:
2123: sub condval {
2124: my $condidx=shift;
2125: my $result=0;
2126: my $allpathcond='';
2127: foreach (split(/\|/,$condidx)) {
2128: if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_})) {
2129: $allpathcond.=
2130: '('.$ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_}.')|';
2131: }
2132: }
2133: $allpathcond=~s/\|$//;
2134: if ($ENV{'request.course.id'}) {
2135: if ($allpathcond) {
2136: my $operand='|';
2137: my @stack;
2138: foreach ($allpathcond=~/(\d+|\(|\)|\&|\|)/g) {
2139: if ($_ eq '(') {
2140: push @stack,($operand,$result)
2141: } elsif ($_ eq ')') {
2142: my $before=pop @stack;
2143: if (pop @stack eq '&') {
2144: $result=$result>$before?$before:$result;
2145: } else {
2146: $result=$result>$before?$result:$before;
2147: }
2148: } elsif (($_ eq '&') || ($_ eq '|')) {
2149: $operand=$_;
2150: } else {
2151: my $new=directcondval($_);
2152: if ($operand eq '&') {
2153: $result=$result>$new?$new:$result;
2154: } else {
2155: $result=$result>$new?$result:$new;
2156: }
2157: }
2158: }
2159: }
2160: }
2161: return $result;
2162: }
2163:
2164: # --------------------------------------------------- Course Resourcedata Query
2165:
2166: sub courseresdata {
2167: my ($coursenum,$coursedomain,@which)=@_;
2168: my $coursehom=&homeserver($coursenum,$coursedomain);
2169: my $hashid=$coursenum.':'.$coursedomain;
2170: unless (defined($courseresdatacache{$hashid.'.time'})) {
2171: unless (time-$courseresdatacache{$hashid.'.time'}<300) {
2172: my $coursehom=&homeserver($coursenum,$coursedomain);
2173: if ($coursehom) {
2174: my $dumpreply=&reply('dump:'.$coursedomain.':'.$coursenum.
2175: ':resourcedata:.',$coursehom);
2176: unless ($dumpreply=~/^error\:/) {
2177: $courseresdatacache{$hashid.'.time'}=time;
2178: $courseresdatacache{$hashid}=$dumpreply;
2179: }
2180: }
2181: }
2182: }
2183: my @pairs=split(/\&/,$courseresdatacache{$hashid});
2184: my %returnhash=();
2185: foreach (@pairs) {
2186: my ($key,$value)=split(/=/,$_);
2187: $returnhash{unescape($key)}=unescape($value);
2188: }
2189: my $item;
2190: foreach $item (@which) {
2191: if ($returnhash{$item}) { return $returnhash{$item}; }
2192: }
2193: return '';
2194: }
2195:
2196: # --------------------------------------------------------- Value of a Variable
2197:
2198: sub EXT {
2199: my ($varname,$symbparm,$udom,$uname)=@_;
2200:
2201: unless ($varname) { return ''; }
2202:
2203: #get real user name/domain, courseid and symb
2204: my $courseid;
2205: if (!($uname && $udom)) {
2206: (my $cursymb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
2207: if (!$symbparm) { $symbparm=$cursymb; }
2208: } else {
2209: $courseid=$ENV{'request.course.id'};
2210: }
2211:
2212: my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
2213: my $rest;
2214: if ($therest[0]) {
2215: $rest=join('.',@therest);
2216: } else {
2217: $rest='';
2218: }
2219: my $qualifierrest=$qualifier;
2220: if ($rest) { $qualifierrest.='.'.$rest; }
2221: my $spacequalifierrest=$space;
2222: if ($qualifierrest) { $spacequalifierrest.='.'.$qualifierrest; }
2223: if ($realm eq 'user') {
2224: # --------------------------------------------------------------- user.resource
2225: if ($space eq 'resource') {
2226: my %restored=&restore(undef,undef,$udom,$uname);
2227: return $restored{$qualifierrest};
2228: # ----------------------------------------------------------------- user.access
2229: } elsif ($space eq 'access') {
2230: # FIXME - not supporting calls for a specific user
2231: return &allowed($qualifier,$rest);
2232: # ------------------------------------------ user.preferences, user.environment
2233: } elsif (($space eq 'preferences') || ($space eq 'environment')) {
2234: if (($uname eq $ENV{'user.name'}) &&
2235: ($udom eq $ENV{'user.domain'})) {
2236: return $ENV{join('.',('environment',$qualifierrest))};
2237: } else {
2238: my %returnhash=&userenvironment($udom,$uname,$qualifierrest);
2239: return $returnhash{$qualifierrest};
2240: }
2241: # ----------------------------------------------------------------- user.course
2242: } elsif ($space eq 'course') {
2243: # FIXME - not supporting calls for a specific user
2244: return $ENV{join('.',('request.course',$qualifier))};
2245: # ------------------------------------------------------------------- user.role
2246: } elsif ($space eq 'role') {
2247: # FIXME - not supporting calls for a specific user
2248: my ($role,$where)=split(/\./,$ENV{'request.role'});
2249: if ($qualifier eq 'value') {
2250: return $role;
2251: } elsif ($qualifier eq 'extent') {
2252: return $where;
2253: }
2254: # ----------------------------------------------------------------- user.domain
2255: } elsif ($space eq 'domain') {
2256: return $udom;
2257: # ------------------------------------------------------------------- user.name
2258: } elsif ($space eq 'name') {
2259: return $uname;
2260: # ---------------------------------------------------- Any other user namespace
2261: } else {
2262: my $item=($rest)?$qualifier.'.'.$rest:$qualifier;
2263: my %reply=&get($space,[$item]);
2264: return $reply{$item};
2265: }
2266: } elsif ($realm eq 'request') {
2267: # ------------------------------------------------------------- request.browser
2268: if ($space eq 'browser') {
2269: return $ENV{'browser.'.$qualifier};
2270: # ------------------------------------------------------------ request.filename
2271: } else {
2272: return $ENV{'request.'.$spacequalifierrest};
2273: }
2274: } elsif ($realm eq 'course') {
2275: # ---------------------------------------------------------- course.description
2276: return $ENV{'course.'.$courseid.'.'.$spacequalifierrest};
2277: } elsif ($realm eq 'resource') {
2278:
2279: if ($courseid eq $ENV{'request.course.id'}) {
2280:
2281: #print '<br>'.$space.' - '.$qualifier.' - '.$spacequalifierrest;
2282:
2283: # ----------------------------------------------------- Cascading lookup scheme
2284: if (!$symbparm) { $symbparm=&symbread(); }
2285: my $symbp=$symbparm;
2286: my $mapp=(split(/\_\_\_/,$symbp))[0];
2287:
2288: my $symbparm=$symbp.'.'.$spacequalifierrest;
2289: my $mapparm=$mapp.'___(all).'.$spacequalifierrest;
2290:
2291: my $section;
2292: if (($ENV{'user.name'} eq $uname) &&
2293: ($ENV{'user.domain'} eq $udom)) {
2294: $section={'request.course.sec'};
2295: } else {
2296: $section=&usection($udom,$uname,$courseid);
2297: }
2298:
2299: my $seclevel=$courseid.'.['.$section.'].'.$spacequalifierrest;
2300: my $seclevelr=$courseid.'.['.$section.'].'.$symbparm;
2301: my $seclevelm=$courseid.'.['.$section.'].'.$mapparm;
2302:
2303: my $courselevel=$courseid.'.'.$spacequalifierrest;
2304: my $courselevelr=$courseid.'.'.$symbparm;
2305: my $courselevelm=$courseid.'.'.$mapparm;
2306:
2307: # ----------------------------------------------------------- first, check user
2308: my %resourcedata=&get('resourcedata',
2309: [$courselevelr,$courselevelm,$courselevel],
2310: $udom,$uname);
2311: if (($resourcedata{$courselevelr}!~/^error\:/) &&
2312: ($resourcedata{$courselevelr}!~/^con_lost/)) {
2313:
2314: if ($resourcedata{$courselevelr}) {
2315: return $resourcedata{$courselevelr}; }
2316: if ($resourcedata{$courselevelm}) {
2317: return $resourcedata{$courselevelm}; }
2318: if ($resourcedata{$courselevel}) {
2319: return $resourcedata{$courselevel}; }
2320: } else {
2321: if ($resourcedata{$courselevelr}!~/No such file/) {
2322: &logthis("<font color=blue>WARNING:".
2323: " Trying to get resource data for ".
2324: $uname." at ".$udom.": ".
2325: $resourcedata{$courselevelr}."</font>");
2326: }
2327: }
2328:
2329: # -------------------------------------------------------- second, check course
2330:
2331: my $coursereply=&courseresdata($ENV{'course.'.$courseid.'.num'},
2332: $ENV{'course.'.$courseid.'.domain'},
2333: ($seclevelr,$seclevelm,$seclevel,
2334: $courselevelr,$courselevelm,
2335: $courselevel));
2336: if ($coursereply) { return $coursereply; }
2337:
2338: # ------------------------------------------------------ third, check map parms
2339: my %parmhash=();
2340: my $thisparm='';
2341: if (tie(%parmhash,'GDBM_File',
2342: $ENV{'request.course.fn'}.'_parms.db',
2343: &GDBM_READER,0640)) {
2344: $thisparm=$parmhash{$symbparm};
2345: untie(%parmhash);
2346: }
2347: if ($thisparm) { return $thisparm; }
2348: }
2349: # --------------------------------------------- last, look in resource metadata
2350:
2351: $spacequalifierrest=~s/\./\_/;
2352: my $metadata=&metadata($ENV{'request.filename'},$spacequalifierrest);
2353: if ($metadata) { return $metadata; }
2354: $metadata=&metadata($ENV{'request.filename'},
2355: 'parameter_'.$spacequalifierrest);
2356: if ($metadata) { return $metadata; }
2357:
2358: # ------------------------------------------------------------------ Cascade up
2359: unless ($space eq '0') {
2360: my ($part,$id)=split(/\_/,$space);
2361: if ($id) {
2362: my $partgeneral=&EXT('resource.'.$part.'.'.$qualifierrest,
2363: $symbparm,$udom,$uname);
2364: if ($partgeneral) { return $partgeneral; }
2365: } else {
2366: my $resourcegeneral=&EXT('resource.0.'.$qualifierrest,
2367: $symbparm,$udom,$uname);
2368: if ($resourcegeneral) { return $resourcegeneral; }
2369: }
2370: }
2371:
2372: # ---------------------------------------------------- Any other user namespace
2373: } elsif ($realm eq 'environment') {
2374: # ----------------------------------------------------------------- environment
2375: return $ENV{'environment.'.$spacequalifierrest};
2376: } elsif ($realm eq 'system') {
2377: # ----------------------------------------------------------------- system.time
2378: if ($space eq 'time') {
2379: return time;
2380: }
2381: }
2382: return '';
2383: }
2384:
2385: # ---------------------------------------------------------------- Get metadata
2386:
2387: sub metadata {
2388: my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
2389:
2390: $uri=&declutter($uri);
2391: my $filename=$uri;
2392: $uri=~s/\.meta$//;
2393: #
2394: # Is the metadata already cached?
2395: # Look at timestamp of caching
2396: # Everything is cached by the main uri, libraries are never directly cached
2397: #
2398: unless (abs($metacache{$uri.':cachedtimestamp'}-time)<600) {
2399: #
2400: # Is this a recursive call for a library?
2401: #
2402: if ($liburi) {
2403: $liburi=&declutter($liburi);
2404: $filename=$liburi;
2405: }
2406: my %metathesekeys=();
2407: unless ($filename=~/\.meta$/) { $filename.='.meta'; }
2408: my $metastring=&getfile($perlvar{'lonDocRoot'}.'/res/'.$filename);
2409: my $parser=HTML::LCParser->new(\$metastring);
2410: my $token;
2411: undef %metathesekeys;
2412: while ($token=$parser->get_token) {
2413: if ($token->[0] eq 'S') {
2414: if (defined($token->[2]->{'package'})) {
2415: #
2416: # This is a package - get package info
2417: #
2418: my $package=$token->[2]->{'package'};
2419: my $keyroot='';
2420: if ($prefix) {
2421: $keyroot.='_'.$prefix;
2422: } else {
2423: if (defined($token->[2]->{'part'})) {
2424: $keyroot.='_'.$token->[2]->{'part'};
2425: }
2426: }
2427: if (defined($token->[2]->{'id'})) {
2428: $keyroot.='_'.$token->[2]->{'id'};
2429: }
2430: if ($metacache{$uri.':packages'}) {
2431: $metacache{$uri.':packages'}.=','.$package.$keyroot;
2432: } else {
2433: $metacache{$uri.':packages'}=$package.$keyroot;
2434: }
2435: foreach (keys %packagetab) {
2436: if ($_=~/^$package\&/) {
2437: my ($pack,$name,$subp)=split(/\&/,$_);
2438: my $value=$packagetab{$_};
2439: my $part=$keyroot;
2440: $part=~s/^\_//;
2441: if ($subp eq 'display') {
2442: $value.=' [Part: '.$part.']';
2443: }
2444: my $unikey='parameter'.$keyroot.'_'.$name;
2445: $metathesekeys{$unikey}=1;
2446: $metacache{$uri.':'.$unikey.'.part'}=$part;
2447: unless
2448: (defined($metacache{$uri.':'.$unikey.'.'.$subp})) {
2449: $metacache{$uri.':'.$unikey.'.'.$subp}=$value;
2450: }
2451: }
2452: }
2453: } else {
2454: #
2455: # This is not a package - some other kind of start tag
2456: #
2457: my $entry=$token->[1];
2458: my $unikey;
2459: if ($entry eq 'import') {
2460: $unikey='';
2461: } else {
2462: $unikey=$entry;
2463: }
2464: if ($prefix) {
2465: $unikey.=$prefix;
2466: } else {
2467: if (defined($token->[2]->{'part'})) {
2468: $unikey.='_'.$token->[2]->{'part'};
2469: }
2470: }
2471: if (defined($token->[2]->{'id'})) {
2472: $unikey.='_'.$token->[2]->{'id'};
2473: }
2474:
2475: if ($entry eq 'import') {
2476: #
2477: # Importing a library here
2478: #
2479: if (defined($depthcount)) { $depthcount++; } else
2480: { $depthcount=0; }
2481: if ($depthcount<20) {
2482: foreach (split(/\,/,&metadata($uri,'keys',
2483: $parser->get_text('/import'),$unikey,
2484: $depthcount))) {
2485: $metathesekeys{$_}=1;
2486: }
2487: }
2488: } else {
2489:
2490: if (defined($token->[2]->{'name'})) {
2491: $unikey.='_'.$token->[2]->{'name'};
2492: }
2493: $metathesekeys{$unikey}=1;
2494: foreach (@{$token->[3]}) {
2495: $metacache{$uri.':'.$unikey.'.'.$_}=$token->[2]->{$_};
2496: }
2497: unless (
2498: $metacache{$uri.':'.$unikey}=&HTML::Entities::decode($parser->get_text('/'.$entry))
2499: ) { $metacache{$uri.':'.$unikey}=
2500: $metacache{$uri.':'.$unikey.'.default'};
2501: }
2502: # end of not-a-package not-a-library import
2503: }
2504: # end of not-a-package start tag
2505: }
2506: # the next is the end of "start tag"
2507: }
2508: }
2509: $metacache{$uri.':keys'}=join(',',keys %metathesekeys);
2510: $metacache{$uri.':cachedtimestamp'}=time;
2511: # this is the end of "was not already recently cached
2512: }
2513: return $metacache{$uri.':'.$what};
2514: }
2515:
2516: # ------------------------------------------------- Update symbolic store links
2517:
2518: sub symblist {
2519: my ($mapname,%newhash)=@_;
2520: $mapname=declutter($mapname);
2521: my %hash;
2522: if (($ENV{'request.course.fn'}) && (%newhash)) {
2523: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
2524: &GDBM_WRCREAT,0640)) {
2525: foreach (keys %newhash) {
2526: $hash{declutter($_)}=$mapname.'___'.$newhash{$_};
2527: }
2528: if (untie(%hash)) {
2529: return 'ok';
2530: }
2531: }
2532: }
2533: return 'error';
2534: }
2535:
2536: # --------------------------------------------------------------- Verify a symb
2537:
2538: sub symbverify {
2539: my ($symb,$thisfn)=@_;
2540: $thisfn=&declutter($thisfn);
2541: # direct jump to resource in page or to a sequence - will construct own symbs
2542: if ($thisfn=~/\.(page|sequence)$/) { return 1; }
2543: # check URL part
2544: my ($map,$resid,$url)=split(/\_\_\_/,$symb);
2545: unless (&symbclean($url) eq &symbclean($thisfn)) { return 0; }
2546:
2547: $symb=&symbclean($symb);
2548:
2549: my %bighash;
2550: my $okay=0;
2551: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
2552: &GDBM_READER,0640)) {
2553: my $ids=$bighash{'ids_/res/'.$thisfn};
2554: unless ($ids) {
2555: $ids=$bighash{'ids_/'.$thisfn};
2556: }
2557: if ($ids) {
2558: # ------------------------------------------------------------------- Has ID(s)
2559: foreach (split(/\,/,$ids)) {
2560: my ($mapid,$resid)=split(/\./,$_);
2561: if (
2562: &symbclean(&declutter($bighash{'map_id_'.$mapid}).'___'.$resid.'___'.$thisfn)
2563: eq $symb) {
2564: $okay=1;
2565: }
2566: }
2567: }
2568: untie(%bighash);
2569: }
2570: return $okay;
2571: }
2572:
2573: # --------------------------------------------------------------- Clean-up symb
2574:
2575: sub symbclean {
2576: my $symb=shift;
2577:
2578: # remove version from map
2579: $symb=~s/\.(\d+)\.(\w+)\_\_\_/\.$2\_\_\_/;
2580:
2581: # remove version from URL
2582: $symb=~s/\.(\d+)\.(\w+)$/\.$2/;
2583:
2584: return $symb;
2585: }
2586:
2587: # ------------------------------------------------------ Return symb list entry
2588:
2589: sub symbread {
2590: my $thisfn=shift;
2591: unless ($thisfn) {
2592: if ($ENV{'request.symb'}) { return &symbclean($ENV{'request.symb'}); }
2593: $thisfn=$ENV{'request.filename'};
2594: }
2595: $thisfn=declutter($thisfn);
2596: my %hash;
2597: my %bighash;
2598: my $syval='';
2599: if (($ENV{'request.course.fn'}) && ($thisfn)) {
2600: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
2601: &GDBM_READER,0640)) {
2602: $syval=$hash{$thisfn};
2603: untie(%hash);
2604: }
2605: # ---------------------------------------------------------- There was an entry
2606: if ($syval) {
2607: unless ($syval=~/\_\d+$/) {
2608: unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {
2609: &appenv('request.ambiguous' => $thisfn);
2610: return '';
2611: }
2612: $syval.=$1;
2613: }
2614: } else {
2615: # ------------------------------------------------------- Was not in symb table
2616: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
2617: &GDBM_READER,0640)) {
2618: # ---------------------------------------------- Get ID(s) for current resource
2619: my $ids=$bighash{'ids_/res/'.$thisfn};
2620: unless ($ids) {
2621: $ids=$bighash{'ids_/'.$thisfn};
2622: }
2623: if ($ids) {
2624: # ------------------------------------------------------------------- Has ID(s)
2625: my @possibilities=split(/\,/,$ids);
2626: if ($#possibilities==0) {
2627: # ----------------------------------------------- There is only one possibility
2628: my ($mapid,$resid)=split(/\./,$ids);
2629: $syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;
2630: } else {
2631: # ------------------------------------------ There is more than one possibility
2632: my $realpossible=0;
2633: foreach (@possibilities) {
2634: my $file=$bighash{'src_'.$_};
2635: if (&allowed('bre',$file)) {
2636: my ($mapid,$resid)=split(/\./,$_);
2637: if ($bighash{'map_type_'.$mapid} ne 'page') {
2638: $realpossible++;
2639: $syval=declutter($bighash{'map_id_'.$mapid}).
2640: '___'.$resid;
2641: }
2642: }
2643: }
2644: if ($realpossible!=1) { $syval=''; }
2645: }
2646: }
2647: untie(%bighash)
2648: }
2649: }
2650: if ($syval) {
2651: return &symbclean($syval.'___'.$thisfn);
2652: }
2653: }
2654: &appenv('request.ambiguous' => $thisfn);
2655: return '';
2656: }
2657:
2658: # ---------------------------------------------------------- Return random seed
2659:
2660: sub numval {
2661: my $txt=shift;
2662: $txt=~tr/A-J/0-9/;
2663: $txt=~tr/a-j/0-9/;
2664: $txt=~tr/K-T/0-9/;
2665: $txt=~tr/k-t/0-9/;
2666: $txt=~tr/U-Z/0-5/;
2667: $txt=~tr/u-z/0-5/;
2668: $txt=~s/\D//g;
2669: return int($txt);
2670: }
2671:
2672: sub rndseed {
2673: my ($symb,$courseid,$domain,$username)=@_;
2674: if (!$symb) {
2675: unless ($symb=&symbread()) { return time; }
2676: }
2677: if (!$courseid) { $courseid=$ENV{'request.course.id'};}
2678: if (!$domain) {$domain=$ENV{'user.domain'};}
2679: if (!$username) {$username=$ENV{'user.name'};}
2680: {
2681: use integer;
2682: my $symbchck=unpack("%32C*",$symb) << 27;
2683: my $symbseed=numval($symb) << 22;
2684: my $namechck=unpack("%32C*",$username) << 17;
2685: my $nameseed=numval($username) << 12;
2686: my $domainseed=unpack("%32C*",$domain) << 7;
2687: my $courseseed=unpack("%32C*",$courseid);
2688: my $num=$symbseed+$nameseed+$domainseed+$courseseed+$namechck+$symbchck;
2689: #uncommenting these lines can break things!
2690: #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
2691: #&Apache::lonxml::debug("rndseed :$num:$symb");
2692: return $num;
2693: }
2694: }
2695:
2696: sub ireceipt {
2697: my ($funame,$fudom,$fucourseid,$fusymb)=@_;
2698: my $cuname=unpack("%32C*",$funame);
2699: my $cudom=unpack("%32C*",$fudom);
2700: my $cucourseid=unpack("%32C*",$fucourseid);
2701: my $cusymb=unpack("%32C*",$fusymb);
2702: my $cunique=unpack("%32C*",$perlvar{'lonReceipt'});
2703: return unpack("%32C*",$perlvar{'lonHostID'}).'-'.
2704: ($cunique%$cuname+
2705: $cunique%$cudom+
2706: $cusymb%$cuname+
2707: $cusymb%$cudom+
2708: $cucourseid%$cuname+
2709: $cucourseid%$cudom);
2710: }
2711:
2712: sub receipt {
2713: return &ireceipt($ENV{'user.name'},$ENV{'user.domain'},
2714: $ENV{'request.course.id'},&symbread());
2715: }
2716:
2717: # ------------------------------------------------------------ Serves up a file
2718: # returns either the contents of the file or a -1
2719: sub getfile {
2720: my $file=shift;
2721: &repcopy($file);
2722: if (! -e $file ) { return -1; };
2723: my $fh=Apache::File->new($file);
2724: my $a='';
2725: while (<$fh>) { $a .=$_; }
2726: return $a
2727: }
2728:
2729: sub filelocation {
2730: my ($dir,$file) = @_;
2731: my $location;
2732: $file=~ s/^\s*(\S+)\s*$/$1/; ## strip off leading and trailing spaces
2733: if ($file=~m:^/~:) { # is a contruction space reference
2734: $location = $file;
2735: $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
2736: } else {
2737: $file=~s/^$perlvar{'lonDocRoot'}//;
2738: $file=~s:^/*res::;
2739: if ( !( $file =~ m:^/:) ) {
2740: $location = $dir. '/'.$file;
2741: } else {
2742: $location = '/home/httpd/html/res'.$file;
2743: }
2744: }
2745: $location=~s://+:/:g; # remove duplicate /
2746: while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
2747: return $location;
2748: }
2749:
2750: sub hreflocation {
2751: my ($dir,$file)=@_;
2752: unless (($file=~/^http:\/\//i) || ($file=~/^\//)) {
2753: my $finalpath=filelocation($dir,$file);
2754: $finalpath=~s/^\/home\/httpd\/html//;
2755: return $finalpath;
2756: } else {
2757: return $file;
2758: }
2759: }
2760:
2761: # ------------------------------------------------------------- Declutters URLs
2762:
2763: sub declutter {
2764: my $thisfn=shift;
2765: $thisfn=~s/^$perlvar{'lonDocRoot'}//;
2766: $thisfn=~s/^\///;
2767: $thisfn=~s/^res\///;
2768: return $thisfn;
2769: }
2770:
2771: # -------------------------------------------------------- Escape Special Chars
2772:
2773: sub escape {
2774: my $str=shift;
2775: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
2776: return $str;
2777: }
2778:
2779: # ----------------------------------------------------- Un-Escape Special Chars
2780:
2781: sub unescape {
2782: my $str=shift;
2783: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
2784: return $str;
2785: }
2786:
2787: # ================================================================ Main Program
2788:
2789: sub goodbye {
2790: &logthis("Starting Shut down");
2791: &flushcourselogs();
2792: &logthis("Shutting down");
2793: }
2794:
2795: BEGIN {
2796: # ------------------------------------------- Read access.conf and loncapa.conf
2797: # (eventually access.conf will become deprecated)
2798: unless ($readit) {
2799:
2800: {
2801: my $config=Apache::File->new("/etc/httpd/conf/access.conf");
2802:
2803: while (my $configline=<$config>) {
2804: if ($configline =~ /^[^\#]*PerlSetVar/) {
2805: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
2806: chomp($varvalue);
2807: $perlvar{$varname}=$varvalue;
2808: }
2809: }
2810: }
2811: {
2812: my $config=Apache::File->new("/etc/httpd/conf/loncapa.conf");
2813:
2814: while (my $configline=<$config>) {
2815: if ($configline =~ /^[^\#]*PerlSetVar/) {
2816: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
2817: chomp($varvalue);
2818: $perlvar{$varname}=$varvalue;
2819: }
2820: }
2821: }
2822:
2823: # ------------------------------------------------------------- Read hosts file
2824: {
2825: my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
2826:
2827: while (my $configline=<$config>) {
2828: chomp($configline);
2829: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
2830: $hostname{$id}=$name;
2831: $hostdom{$id}=$domain;
2832: $hostip{$id}=$ip;
2833: if ($role eq 'library') { $libserv{$id}=$name; }
2834: }
2835: }
2836:
2837: # ------------------------------------------------------ Read spare server file
2838: {
2839: my $config=Apache::File->new("$perlvar{'lonTabDir'}/spare.tab");
2840:
2841: while (my $configline=<$config>) {
2842: chomp($configline);
2843: if (($configline) && ($configline ne $perlvar{'lonHostID'})) {
2844: $spareid{$configline}=1;
2845: }
2846: }
2847: }
2848: # ------------------------------------------------------------ Read permissions
2849: {
2850: my $config=Apache::File->new("$perlvar{'lonTabDir'}/roles.tab");
2851:
2852: while (my $configline=<$config>) {
2853: chomp($configline);
2854: if ($configline) {
2855: my ($role,$perm)=split(/ /,$configline);
2856: if ($perm ne '') { $pr{$role}=$perm; }
2857: }
2858: }
2859: }
2860:
2861: # -------------------------------------------- Read plain texts for permissions
2862: {
2863: my $config=Apache::File->new("$perlvar{'lonTabDir'}/rolesplain.tab");
2864:
2865: while (my $configline=<$config>) {
2866: chomp($configline);
2867: if ($configline) {
2868: my ($short,$plain)=split(/:/,$configline);
2869: if ($plain ne '') { $prp{$short}=$plain; }
2870: }
2871: }
2872: }
2873:
2874: # ---------------------------------------------------------- Read package table
2875: {
2876: my $config=Apache::File->new("$perlvar{'lonTabDir'}/packages.tab");
2877:
2878: while (my $configline=<$config>) {
2879: chomp($configline);
2880: my ($short,$plain)=split(/:/,$configline);
2881: my ($pack,$name)=split(/\&/,$short);
2882: if ($plain ne '') {
2883: $packagetab{$pack.'&'.$name.'&name'}=$name;
2884: $packagetab{$short}=$plain;
2885: }
2886: }
2887: }
2888:
2889: %metacache=();
2890:
2891: $processmarker=$$.'_'.time.'_'.$perlvar{'lonHostID'};
2892: $dumpcount=0;
2893:
2894: &logtouch();
2895: &logthis('<font color=yellow>INFO: Read configuration</font>');
2896: $readit=1;
2897: }
2898: }
2899:
2900: 1;
2901: __END__
2902:
2903: =head1 NAME
2904:
2905: Apache::lonnet - TCP networking package
2906:
2907: =head1 SYNOPSIS
2908:
2909: Invoked by other LON-CAPA modules.
2910:
2911: &Apache::lonnet::SUBROUTINENAME(ARGUMENTS);
2912:
2913: =head1 INTRODUCTION
2914:
2915: This module provides subroutines which interact with the
2916: lonc/lond (TCP) network layer of LON-CAPA.
2917:
2918: This is part of the LearningOnline Network with CAPA project
2919: described at http://www.lon-capa.org.
2920:
2921: =head1 HANDLER SUBROUTINE
2922:
2923: There is no handler routine for this module.
2924:
2925: =head1 OTHER SUBROUTINES
2926:
2927: =over 4
2928:
2929: =item *
2930:
2931: logtouch() : make sure the logfile, lonnet.log, exists
2932:
2933: =item *
2934:
2935: logthis() : append message to lonnet.log
2936:
2937: =item *
2938:
2939: logperm() : append a permanent message to lonnet.perm.log
2940:
2941: =item *
2942:
2943: subreply() : non-critical communication, called by &reply
2944:
2945: =item *
2946:
2947: reply() : makes two attempts to pass message; logs refusals and rejections
2948:
2949: =item *
2950:
2951: reconlonc() : tries to reconnect lonc client processes.
2952:
2953: =item *
2954:
2955: critical() : passes a critical message to another server; if cannot get
2956: through then place message in connection buffer
2957:
2958: =item *
2959:
2960: appenv(%hash) : read in current user environment, append new environment
2961: values to make new user environment
2962:
2963: =item *
2964:
2965: delenv($varname) : read in current user environment, remove all values
2966: beginning with $varname, write new user environment (note: flock is used
2967: to prevent conflicting shared read/writes with file)
2968:
2969: =item *
2970:
2971: spareserver() : find server with least workload from spare.tab
2972:
2973: =item *
2974:
2975: queryauthenticate($uname,$udom) : try to determine user's current
2976: authentication scheme
2977:
2978: =item *
2979:
2980: authenticate($uname,$upass,$udom) : try to authenticate user from domain's lib
2981: servers (first use the current one)
2982:
2983: =item *
2984:
2985: homeserver($uname,$udom) : find the homebase for a user from domain's lib
2986: servers
2987:
2988: =item *
2989:
2990: idget($udom,@ids) : find the usernames behind a list of IDs (returns hash:
2991: id=>name,id=>name)
2992:
2993: =item *
2994:
2995: idrget($udom,@unames) : find the IDs behind a list of usernames (returns hash:
2996: name=>id,name=>id)
2997:
2998: =item *
2999:
3000: idput($udom,%ids) : store away a list of names and associated IDs
3001:
3002: =item *
3003:
3004: usection($domain,$user,$courseid) : output of section name/number or '' for
3005: "not in course" and '-1' for "no section"
3006:
3007: =item *
3008:
3009: userenvironment($domain,$user,$what) : puts out any environment parameter
3010: for a user
3011:
3012: =item *
3013:
3014: subscribe($fname) : subscribe to a resource, return URL if possible
3015:
3016: =item *
3017:
3018: repcopy($filename) : replicate file
3019:
3020: =item *
3021:
3022: ssi($url,%hash) : server side include, does a complete request cycle on url to
3023: localhost, posts hash
3024:
3025: =item *
3026:
3027: log($domain,$name,$home,$message) : write to permanent log for user; use
3028: critical subroutine
3029:
3030: =item *
3031:
3032: flushcourselogs() : flush (save) buffer logs and access logs
3033:
3034: =item *
3035:
3036: courselog($what) : save message for course in hash
3037:
3038: =item *
3039:
3040: courseacclog($what) : save message for course using &courselog(). Perform
3041: special processing for specific resource types (problems, exams, quizzes, etc).
3042:
3043: =item *
3044:
3045: countacc($url) : count the number of accesses to a given URL
3046:
3047: =item *
3048:
3049: sub checkout($symb,$tuname,$tudom,$tcrsid) : check out an item
3050:
3051: =item *
3052:
3053: sub checkin($token) : check in an item
3054:
3055: =item *
3056:
3057: sub expirespread($uname,$udom,$stype,$usymb) : set expire date for spreadsheet
3058:
3059: =item *
3060:
3061: devalidate($symb) : devalidate spreadsheets
3062:
3063: =item *
3064:
3065: hash2str(%hash) : convert a hash into a string complete with escaping and '='
3066: and '&' separators, supports elements that are arrayrefs and hashrefs
3067:
3068: =item *
3069:
3070: hashref2str($hashref) : convert a hashref into a string complete with
3071: escaping and '=' and '&' separators, supports elements that are
3072: arrayrefs and hashrefs
3073:
3074: =item *
3075:
3076: arrayref2str($arrayref) : convert an arrayref into a string complete
3077: with escaping and '&' separators, supports elements that are arrayrefs
3078: and hashrefs
3079:
3080: =item *
3081:
3082: str2hash($string) : convert string to hash using unescaping and
3083: splitting on '=' and '&', supports elements that are arrayrefs and
3084: hashrefs
3085:
3086: =item *
3087:
3088: str2array($string) : convert string to hash using unescaping and
3089: splitting on '&', supports elements that are arrayrefs and hashrefs
3090:
3091: =item *
3092:
3093: tmpreset($symb,$namespace,$domain,$stuname) : temporary storage
3094:
3095: =item *
3096:
3097: tmprestore($symb,$namespace,$domain,$stuname) : temporary restore
3098:
3099: =item *
3100:
3101: store($storehash,$symb,$namespace,$domain,$stuname) : stores hash permanently
3102: for this url; hashref needs to be given and should be a \%hashname; the
3103: remaining args aren't required and if they aren't passed or are '' they will
3104: be derived from the ENV
3105:
3106: =item *
3107:
3108: cstore($storehash,$symb,$namespace,$domain,$stuname) : same as store but
3109: uses critical subroutine
3110:
3111: =item *
3112:
3113: restore($symb,$namespace,$domain,$stuname) : returns hash for this symb;
3114: all args are optional
3115:
3116: =item *
3117:
3118: coursedescription($courseid) : course description
3119:
3120: =item *
3121:
3122: rolesinit($domain,$username,$authhost) : get user privileges
3123:
3124: =item *
3125:
3126: get($namespace,$storearr,$udomain,$uname) : returns hash with keys from array
3127: reference filled in from namesp ($udomain and $uname are optional)
3128:
3129: =item *
3130:
3131: del($namespace,$storearr,$udomain,$uname) : deletes keys out of array from
3132: namesp ($udomain and $uname are optional)
3133:
3134: =item *
3135:
3136: dump($namespace,$udomain,$uname,$regexp) :
3137: dumps the complete (or key matching regexp) namespace into a hash
3138: ($udomain, $uname and $regexp are optional)
3139:
3140: =item *
3141:
3142: put($namespace,$storehash,$udomain,$uname) : stores hash in namesp
3143: ($udomain and $uname are optional)
3144:
3145: =item *
3146:
3147: cput($namespace,$storehash,$udomain,$uname) : critical put
3148: ($udomain and $uname are optional)
3149:
3150: =item *
3151:
3152: eget($namespace,$storearr,$udomain,$uname) : returns hash with keys from array
3153: reference filled in from namesp (encrypts the return communication)
3154: ($udomain and $uname are optional)
3155:
3156: =item *
3157:
3158: allowed($priv,$uri) : check for a user privilege; returns codes for allowed
3159: actions
3160: F: full access
3161: U,I,K: authentication modes (cxx only)
3162: '': forbidden
3163: 1: user needs to choose course
3164: 2: browse allowed
3165:
3166: =item *
3167:
3168: definerole($rolename,$sysrole,$domrole,$courole) : define role; define a custom
3169: role rolename set privileges in format of lonTabs/roles.tab for system, domain,
3170: and course level
3171:
3172: =item *
3173:
3174: metadata_query($query,$custom,$customshow) : make a metadata query against the
3175: network of library servers; returns file handle of where SQL and regex results
3176: will be stored for query
3177:
3178: =item *
3179:
3180: plaintext($short) : return value in %prp hash (rolesplain.tab); plain text
3181: explanation of a user role term
3182:
3183: =item *
3184:
3185: assignrole($udom,$uname,$url,$role,$end,$start) : assign role; give a role to a
3186: user for the level given by URL. Optional start and end dates (leave empty
3187: string or zero for "no date")
3188:
3189: =item *
3190:
3191: modifyuserauth($udom,$uname,$umode,$upass) : modify user authentication
3192:
3193: =item *
3194:
3195: modifyuser($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene) :
3196: modify user
3197:
3198: =item *
3199:
3200: modifystudent($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,
3201: $end,$start) : modify student
3202:
3203: =item *
3204:
3205: writecoursepref($courseid,%prefs) : write preferences for a course
3206:
3207: =item *
3208:
3209: createcourse($udom,$description,$url) : make/modify course
3210:
3211: =item *
3212:
3213: assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start) : assign
3214: custom role; give a custom role to a user for the level given by URL. Specify
3215: name and domain of role author, and role name
3216:
3217: =item *
3218:
3219: revokerole($udom,$uname,$url,$role) : revoke a role for url
3220:
3221: =item *
3222:
3223: revokecustomrole($udom,$uname,$url,$role) : revoke a custom role
3224:
3225: =item *
3226:
3227: dirlist($uri) : return directory list based on URI
3228:
3229: =item *
3230:
3231: directcondval($number) : get current value of a condition; reads from a state
3232: string
3233:
3234: =item *
3235:
3236: condval($condidx) : value of condition index based on state
3237:
3238: =item *
3239:
3240: EXT($varname,$symbparm) : value of a variable
3241:
3242: =item *
3243:
3244: metadata($uri,$what,$liburi,$prefix,$depthcount) : get metadata; returns the
3245: metadata entry for a file; entry='keys', returns a comma separated list of keys
3246:
3247: =item *
3248:
3249: symblist($mapname,%newhash) : update symbolic storage links
3250:
3251: =item *
3252:
3253: symbread($filename) : return symbolic list entry (filename argument optional);
3254: returns the data handle
3255:
3256: =item *
3257:
3258: numval($salt) : return random seed value (addend for rndseed)
3259:
3260: =item *
3261:
3262: rndseed($symb,$courseid,$domain,$username) : create a random sum; returns
3263: a random seed, all arguments are optional, if they aren't sent it uses the
3264: environment to derive them. Note: if symb isn't sent and it can't get one
3265: from &symbread it will use the current time as its return value
3266:
3267: =item *
3268:
3269: ireceipt($funame,$fudom,$fucourseid,$fusymb) : return unique,
3270: unfakeable, receipt
3271:
3272: =item *
3273:
3274: receipt() : API to ireceipt working off of ENV values; given out to users
3275:
3276: =item *
3277:
3278: getfile($file) : serves up a file, returns the contents of a file or -1;
3279: replicates and subscribes to the file
3280:
3281: =item *
3282:
3283: filelocation($dir,$file) : returns file system location of a file based on URI;
3284: meant to be "fairly clean" absolute reference
3285:
3286: =item *
3287:
3288: hreflocation($dir,$file) : returns file system location or a URL; same as
3289: filelocation except for hrefs
3290:
3291: =item *
3292:
3293: declutter() : declutters URLs (remove docroot, beginning slashes, 'res' etc)
3294:
3295: =item *
3296:
3297: escape() : unpack non-word characters into CGI-compatible hex codes
3298:
3299: =item *
3300:
3301: unescape() : pack CGI-compatible hex codes into actual non-word ASCII character
3302:
3303: =item *
3304:
3305: goodbye() : flush course logs and log shutting down; it is called in srm.conf
3306: as a PerlChildExitHandler
3307:
3308: =back
3309:
3310: =cut
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