1: # The LearningOnline Network
2: # TCP networking package
3: #
4: # $Id: lonnet.pm,v 1.230 2002/05/21 15:00:05 stredwic 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 %badhomecache %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,$ignoreBadCache)=@_;
485: my $index="$uname:$udom";
486: if ($homecache{$index}) {
487: return "$homecache{$index}";
488: }
489: my $tryserver;
490: foreach $tryserver (keys %libserv) {
491: next if ($ignoreBadCache ne 'true' &&
492: exists($badhomecache{$index}->{$tryserver}));
493: if ($hostdom{$tryserver} eq $udom) {
494: my $answer=reply("home:$udom:$uname",$tryserver);
495: if ($answer eq 'found') {
496: $homecache{$index}=$tryserver;
497: return $tryserver;
498: } else {
499: $badhomecache{$index}->{$tryserver}=1;
500: }
501: } else {
502: $badhomecache{$index}->{$tryserver}=1;
503: }
504: }
505: return 'no_host';
506: }
507:
508: # ------------------------------------- Find the usernames behind a list of IDs
509:
510: sub idget {
511: my ($udom,@ids)=@_;
512: my %returnhash=();
513:
514: my $tryserver;
515: foreach $tryserver (keys %libserv) {
516: if ($hostdom{$tryserver} eq $udom) {
517: my $idlist=join('&',@ids);
518: $idlist=~tr/A-Z/a-z/;
519: my $reply=&reply("idget:$udom:".$idlist,$tryserver);
520: my @answer=();
521: if (($reply ne 'con_lost') && ($reply!~/^error\:/)) {
522: @answer=split(/\&/,$reply);
523: } ;
524: my $i;
525: for ($i=0;$i<=$#ids;$i++) {
526: if ($answer[$i]) {
527: $returnhash{$ids[$i]}=$answer[$i];
528: }
529: }
530: }
531: }
532: return %returnhash;
533: }
534:
535: # ------------------------------------- Find the IDs behind a list of usernames
536:
537: sub idrget {
538: my ($udom,@unames)=@_;
539: my %returnhash=();
540: foreach (@unames) {
541: $returnhash{$_}=(&userenvironment($udom,$_,'id'))[1];
542: }
543: return %returnhash;
544: }
545:
546: # ------------------------------- Store away a list of names and associated IDs
547:
548: sub idput {
549: my ($udom,%ids)=@_;
550: my %servers=();
551: foreach (keys %ids) {
552: my $uhom=&homeserver($_,$udom);
553: if ($uhom ne 'no_host') {
554: my $id=&escape($ids{$_});
555: $id=~tr/A-Z/a-z/;
556: my $unam=&escape($_);
557: if ($servers{$uhom}) {
558: $servers{$uhom}.='&'.$id.'='.$unam;
559: } else {
560: $servers{$uhom}=$id.'='.$unam;
561: }
562: &critical('put:'.$udom.':'.$unam.':environment:id='.$id,$uhom);
563: }
564: }
565: foreach (keys %servers) {
566: &critical('idput:'.$udom.':'.$servers{$_},$_);
567: }
568: }
569:
570: # ------------------------------------- Find the section of student in a course
571:
572: sub usection {
573: my ($udom,$unam,$courseid)=@_;
574: $courseid=~s/\_/\//g;
575: $courseid=~s/^(\w)/\/$1/;
576: foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
577: &homeserver($unam,$udom)))) {
578: my ($key,$value)=split(/\=/,$_);
579: $key=&unescape($key);
580: if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
581: my $section=$1;
582: if ($key eq $courseid.'_st') { $section=''; }
583: my ($dummy,$end,$start)=split(/\_/,&unescape($value));
584: my $now=time;
585: my $notactive=0;
586: if ($start) {
587: if ($now<$start) { $notactive=1; }
588: }
589: if ($end) {
590: if ($now>$end) { $notactive=1; }
591: }
592: unless ($notactive) { return $section; }
593: }
594: }
595: return '-1';
596: }
597:
598: # ------------------------------------- Read an entry from a user's environment
599:
600: sub userenvironment {
601: my ($udom,$unam,@what)=@_;
602: my %returnhash=();
603: my @answer=split(/\&/,
604: &reply('get:'.$udom.':'.$unam.':environment:'.join('&',@what),
605: &homeserver($unam,$udom)));
606: my $i;
607: for ($i=0;$i<=$#what;$i++) {
608: $returnhash{$what[$i]}=&unescape($answer[$i]);
609: }
610: return %returnhash;
611: }
612:
613: # ----------------------------- Subscribe to a resource, return URL if possible
614:
615: sub subscribe {
616: my $fname=shift;
617: my $author=$fname;
618: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
619: my ($udom,$uname)=split(/\//,$author);
620: my $home=homeserver($uname,$udom);
621: if (($home eq 'no_host') || ($home eq $perlvar{'lonHostID'})) {
622: return 'not_found';
623: }
624: my $answer=reply("sub:$fname",$home);
625: if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
626: $answer.=' by '.$home;
627: }
628: return $answer;
629: }
630:
631: # -------------------------------------------------------------- Replicate file
632:
633: sub repcopy {
634: my $filename=shift;
635: $filename=~s/\/+/\//g;
636: if ($filename=~/^\/home\/httpd\/html\/adm\//) { return OK; }
637: my $transname="$filename.in.transfer";
638: if ((-e $filename) || (-e $transname)) { return OK; }
639: my $remoteurl=subscribe($filename);
640: if ($remoteurl =~ /^con_lost by/) {
641: &logthis("Subscribe returned $remoteurl: $filename");
642: return HTTP_SERVICE_UNAVAILABLE;
643: } elsif ($remoteurl eq 'not_found') {
644: &logthis("Subscribe returned not_found: $filename");
645: return HTTP_NOT_FOUND;
646: } elsif ($remoteurl =~ /^rejected by/) {
647: &logthis("Subscribe returned $remoteurl: $filename");
648: return FORBIDDEN;
649: } elsif ($remoteurl eq 'directory') {
650: return OK;
651: } else {
652: my @parts=split(/\//,$filename);
653: my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";
654: if ($path ne "$perlvar{'lonDocRoot'}/res") {
655: &logthis("Malconfiguration for replication: $filename");
656: return HTTP_BAD_REQUEST;
657: }
658: my $count;
659: for ($count=5;$count<$#parts;$count++) {
660: $path.="/$parts[$count]";
661: if ((-e $path)!=1) {
662: mkdir($path,0777);
663: }
664: }
665: my $ua=new LWP::UserAgent;
666: my $request=new HTTP::Request('GET',"$remoteurl");
667: my $response=$ua->request($request,$transname);
668: if ($response->is_error()) {
669: unlink($transname);
670: my $message=$response->status_line;
671: &logthis("<font color=blue>WARNING:"
672: ." LWP get: $message: $filename</font>");
673: return HTTP_SERVICE_UNAVAILABLE;
674: } else {
675: if ($remoteurl!~/\.meta$/) {
676: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
677: my $mresponse=$ua->request($mrequest,$filename.'.meta');
678: if ($mresponse->is_error()) {
679: unlink($filename.'.meta');
680: &logthis(
681: "<font color=yellow>INFO: No metadata: $filename</font>");
682: }
683: }
684: rename($transname,$filename);
685: return OK;
686: }
687: }
688: }
689:
690: # --------------------------------------------------------- Server Side Include
691:
692: sub ssi {
693:
694: my ($fn,%form)=@_;
695:
696: my $ua=new LWP::UserAgent;
697:
698: my $request;
699:
700: if (%form) {
701: $request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);
702: $request->content(join('&',map { &escape($_).'='.&escape($form{$_}) } keys %form));
703: } else {
704: $request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);
705: }
706:
707: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
708: my $response=$ua->request($request);
709:
710: return $response->content;
711: }
712:
713: # ------------------------------------------------------------------------- Log
714:
715: sub log {
716: my ($dom,$nam,$hom,$what)=@_;
717: return critical("log:$dom:$nam:$what",$hom);
718: }
719:
720: # ------------------------------------------------------------------ Course Log
721:
722: sub flushcourselogs {
723: &logthis('Flushing course log buffers');
724: foreach (keys %courselogs) {
725: my $crsid=$_;
726: if (&reply('log:'.$coursedombuf{$crsid}.':'.
727: &escape($courselogs{$crsid}),
728: $coursehombuf{$crsid}) eq 'ok') {
729: delete $courselogs{$crsid};
730: } else {
731: &logthis('Failed to flush log buffer for '.$crsid);
732: if (length($courselogs{$crsid})>40000) {
733: &logthis("<font color=blue>WARNING: Buffer for ".$crsid.
734: " exceeded maximum size, deleting.</font>");
735: delete $courselogs{$crsid};
736: }
737: }
738: }
739: &logthis('Flushing access logs');
740: foreach (keys %accesshash) {
741: my $entry=$_;
742: $entry=~/\_\_\_(\w+)\/(\w+)\/(.*)\_\_\_(\w+)$/;
743: my %temphash=($entry => $accesshash{$entry});
744: if (&Apache::lonnet::put('resevaldata',\%temphash,$1,$2) eq 'ok') {
745: delete $accesshash{$entry};
746: }
747: }
748: $dumpcount++;
749: }
750:
751: sub courselog {
752: my $what=shift;
753: $what=time.':'.$what;
754: unless ($ENV{'request.course.id'}) { return ''; }
755: $coursedombuf{$ENV{'request.course.id'}}=
756: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.
757: $ENV{'course.'.$ENV{'request.course.id'}.'.num'};
758: $coursehombuf{$ENV{'request.course.id'}}=
759: $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
760: if (defined $courselogs{$ENV{'request.course.id'}}) {
761: $courselogs{$ENV{'request.course.id'}}.='&'.$what;
762: } else {
763: $courselogs{$ENV{'request.course.id'}}.=$what;
764: }
765: if (length($courselogs{$ENV{'request.course.id'}})>4048) {
766: &flushcourselogs();
767: }
768: }
769:
770: sub courseacclog {
771: my $fnsymb=shift;
772: unless ($ENV{'request.course.id'}) { return ''; }
773: my $what=$fnsymb.':'.$ENV{'user.name'}.':'.$ENV{'user.domain'};
774: if ($fnsymb=~/(problem|exam|quiz|assess|survey|form)$/) {
775: $what.=':POST';
776: foreach (keys %ENV) {
777: if ($_=~/^form\.(.*)/) {
778: $what.=':'.$1.'='.$ENV{$_};
779: }
780: }
781: }
782: &courselog($what);
783: }
784:
785: sub countacc {
786: my $url=&declutter(shift);
787: unless ($ENV{'request.course.id'}) { return ''; }
788: $accesshash{$ENV{'request.course.id'}.'___'.$url.'___course'}=1;
789: my $key=$processmarker.'_'.$dumpcount.'___'.$url.'___count';
790: if (defined($accesshash{$key})) {
791: $accesshash{$key}++;
792: } else {
793: $accesshash{$key}=1;
794: }
795: }
796:
797: # ----------------------------------------------------------- Check out an item
798:
799: sub checkout {
800: my ($symb,$tuname,$tudom,$tcrsid)=@_;
801: my $now=time;
802: my $lonhost=$perlvar{'lonHostID'};
803: my $infostr=&escape(
804: $tuname.'&'.
805: $tudom.'&'.
806: $tcrsid.'&'.
807: $symb.'&'.
808: $now.'&'.$ENV{'REMOTE_ADDR'});
809: my $token=&reply('tmpput:'.$infostr,$lonhost);
810: if ($token=~/^error\:/) {
811: &logthis("<font color=blue>WARNING: ".
812: "Checkout tmpput failed ".$tudom.' - '.$tuname.' - '.$symb.
813: "</font>");
814: return '';
815: }
816:
817: $token=~s/^(\d+)\_.*\_(\d+)$/$1\*$2\*$lonhost/;
818: $token=~tr/a-z/A-Z/;
819:
820: my %infohash=('resource.0.outtoken' => $token,
821: 'resource.0.checkouttime' => $now,
822: 'resource.0.outremote' => $ENV{'REMOTE_ADDR'});
823:
824: unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
825: return '';
826: } else {
827: &logthis("<font color=blue>WARNING: ".
828: "Checkout cstore failed ".$tudom.' - '.$tuname.' - '.$symb.
829: "</font>");
830: }
831:
832: if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
833: &escape('Checkout '.$infostr.' - '.
834: $token)) ne 'ok') {
835: return '';
836: } else {
837: &logthis("<font color=blue>WARNING: ".
838: "Checkout log failed ".$tudom.' - '.$tuname.' - '.$symb.
839: "</font>");
840: }
841: return $token;
842: }
843:
844: # ------------------------------------------------------------ Check in an item
845:
846: sub checkin {
847: my $token=shift;
848: my $now=time;
849: my ($ta,$tb,$lonhost)=split(/\*/,$token);
850: $lonhost=~tr/A-Z/a-z/;
851: my $dtoken=$ta.'_'.$hostip{$lonhost}.'_'.$tb;
852: $dtoken=~s/\W/\_/g;
853: my ($tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=
854: split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));
855:
856: unless (($tuname) && ($tudom)) {
857: &logthis('Check in '.$token.' ('.$dtoken.') failed');
858: return '';
859: }
860:
861: unless (&allowed('mgr',$tcrsid)) {
862: &logthis('Check in '.$token.' ('.$dtoken.') unauthorized: '.
863: $ENV{'user.name'}.' - '.$ENV{'user.domain'});
864: return '';
865: }
866:
867: my %infohash=('resource.0.intoken' => $token,
868: 'resource.0.checkintime' => $now,
869: 'resource.0.inremote' => $ENV{'REMOTE_ADDR'});
870:
871: unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
872: return '';
873: }
874:
875: if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
876: &escape('Checkin - '.$token)) ne 'ok') {
877: return '';
878: }
879:
880: return ($symb,$tuname,$tudom,$tcrsid);
881: }
882:
883: # --------------------------------------------- Set Expire Date for Spreadsheet
884:
885: sub expirespread {
886: my ($uname,$udom,$stype,$usymb)=@_;
887: my $cid=$ENV{'request.course.id'};
888: if ($cid) {
889: my $now=time;
890: my $key=$uname.':'.$udom.':'.$stype.':'.$usymb;
891: return &reply('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
892: $ENV{'course.'.$cid.'.num'}.
893: ':nohist_expirationdates:'.
894: &escape($key).'='.$now,
895: $ENV{'course.'.$cid.'.home'})
896: }
897: return 'ok';
898: }
899:
900: # ----------------------------------------------------- Devalidate Spreadsheets
901:
902: sub devalidate {
903: my $symb=shift;
904: my $cid=$ENV{'request.course.id'};
905: if ($cid) {
906: my $key=$ENV{'user.name'}.':'.$ENV{'user.domain'}.':';
907: my $status=
908: &del('nohist_calculatedsheet',
909: [$key.'studentcalc'],
910: $ENV{'course.'.$cid.'.domain'},
911: $ENV{'course.'.$cid.'.num'})
912: .' '.
913: &del('nohist_calculatedsheets_'.$cid,
914: [$key.'assesscalc:'.$symb]);
915: unless ($status eq 'ok ok') {
916: &logthis('Could not devalidate spreadsheet '.
917: $ENV{'user.name'}.' at '.$ENV{'user.domain'}.' for '.
918: $symb.': '.$status);
919: }
920: }
921: }
922:
923: sub arrayref2str {
924: my ($arrayref) = @_;
925: my $result='_ARRAY_REF__';
926: foreach my $elem (@$arrayref) {
927: if (ref($elem) eq 'ARRAY') {
928: $result.=&escape(&arrayref2str($elem)).'&';
929: } elsif (ref($elem) eq 'HASH') {
930: $result.=&escape(&hashref2str($elem)).'&';
931: } elsif (ref($elem)) {
932: &logthis("Got a ref of ".(ref($elem))." skipping.");
933: } else {
934: $result.=&escape($elem).'&';
935: }
936: }
937: $result=~s/\&$//;
938: return $result;
939: }
940:
941: sub hash2str {
942: my (%hash) = @_;
943: my $result=&hashref2str(\%hash);
944: $result=~s/^_HASH_REF__//;
945: return $result;
946: }
947:
948: sub hashref2str {
949: my ($hashref)=@_;
950: my $result='_HASH_REF__';
951: foreach (keys(%$hashref)) {
952: if (ref($_) eq 'ARRAY') {
953: $result.=&escape(&arrayref2str($_)).'=';
954: } elsif (ref($_) eq 'HASH') {
955: $result.=&escape(&hashref2str($_)).'=';
956: } elsif (ref($_)) {
957: &logthis("Got a ref of ".(ref($_))." skipping.");
958: } else {
959: $result.=&escape($_).'=';
960: }
961:
962: if (ref($$hashref{$_}) eq 'ARRAY') {
963: $result.=&escape(&arrayref2str($$hashref{$_})).'&';
964: } elsif (ref($$hashref{$_}) eq 'HASH') {
965: $result.=&escape(&hashref2str($$hashref{$_})).'&';
966: } elsif (ref($$hashref{$_})) {
967: &logthis("Got a ref of ".(ref($$hashref{$_}))." skipping.");
968: } else {
969: $result.=&escape($$hashref{$_}).'&';
970: }
971: }
972: $result=~s/\&$//;
973: return $result;
974: }
975:
976: sub str2hash {
977: my ($string) = @_;
978: my %returnhash;
979: foreach (split(/\&/,$string)) {
980: my ($name,$value)=split(/\=/,$_);
981: $name=&unescape($name);
982: $value=&unescape($value);
983: if ($value =~ /^_HASH_REF__/) {
984: $value =~ s/^_HASH_REF__//;
985: my %hash=&str2hash($value);
986: $value=\%hash;
987: } elsif ($value =~ /^_ARRAY_REF__/) {
988: $value =~ s/^_ARRAY_REF__//;
989: my @array=&str2array($value);
990: $value=\@array;
991: }
992: $returnhash{$name}=$value;
993: }
994: return (%returnhash);
995: }
996:
997: sub str2array {
998: my ($string) = @_;
999: my @returnarray;
1000: foreach my $value (split(/\&/,$string)) {
1001: $value=&unescape($value);
1002: if ($value =~ /^_HASH_REF__/) {
1003: $value =~ s/^_HASH_REF__//;
1004: my %hash=&str2hash($value);
1005: $value=\%hash;
1006: } elsif ($value =~ /^_ARRAY_REF__/) {
1007: $value =~ s/^_ARRAY_REF__//;
1008: my @array=&str2array($value);
1009: $value=\@array;
1010: }
1011: push(@returnarray,$value);
1012: }
1013: return (@returnarray);
1014: }
1015:
1016: # -------------------------------------------------------------------Temp Store
1017:
1018: sub tmpreset {
1019: my ($symb,$namespace,$domain,$stuname) = @_;
1020: if (!$symb) {
1021: $symb=&symbread();
1022: if (!$symb) { $symb= $ENV{'REQUEST_URI'}; }
1023: }
1024: $symb=escape($symb);
1025:
1026: if (!$namespace) { $namespace=$ENV{'request.state'}; }
1027: $namespace=~s/\//\_/g;
1028: $namespace=~s/\W//g;
1029:
1030: #FIXME needs to do something for /pub resources
1031: if (!$domain) { $domain=$ENV{'user.domain'}; }
1032: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1033: my $path=$perlvar{'lonDaemons'}.'/tmp';
1034: my %hash;
1035: if (tie(%hash,'GDBM_File',
1036: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1037: &GDBM_WRCREAT,0640)) {
1038: foreach my $key (keys %hash) {
1039: if ($key=~ /:$symb/) {
1040: delete($hash{$key});
1041: }
1042: }
1043: }
1044: }
1045:
1046: sub tmpstore {
1047: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1048:
1049: if (!$symb) {
1050: $symb=&symbread();
1051: if (!$symb) { $symb= $ENV{'request.url'}; }
1052: }
1053: $symb=escape($symb);
1054:
1055: if (!$namespace) {
1056: # I don't think we would ever want to store this for a course.
1057: # it seems this will only be used if we don't have a course.
1058: #$namespace=$ENV{'request.course.id'};
1059: #if (!$namespace) {
1060: $namespace=$ENV{'request.state'};
1061: #}
1062: }
1063: $namespace=~s/\//\_/g;
1064: $namespace=~s/\W//g;
1065: #FIXME needs to do something for /pub resources
1066: if (!$domain) { $domain=$ENV{'user.domain'}; }
1067: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1068: my $now=time;
1069: my %hash;
1070: my $path=$perlvar{'lonDaemons'}.'/tmp';
1071: if (tie(%hash,'GDBM_File',
1072: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1073: &GDBM_WRCREAT,0640)) {
1074: $hash{"version:$symb"}++;
1075: my $version=$hash{"version:$symb"};
1076: my $allkeys='';
1077: foreach my $key (keys(%$storehash)) {
1078: $allkeys.=$key.':';
1079: $hash{"$version:$symb:$key"}=$$storehash{$key};
1080: }
1081: $hash{"$version:$symb:timestamp"}=$now;
1082: $allkeys.='timestamp';
1083: $hash{"$version:keys:$symb"}=$allkeys;
1084: if (untie(%hash)) {
1085: return 'ok';
1086: } else {
1087: return "error:$!";
1088: }
1089: } else {
1090: return "error:$!";
1091: }
1092: }
1093:
1094: # -----------------------------------------------------------------Temp Restore
1095:
1096: sub tmprestore {
1097: my ($symb,$namespace,$domain,$stuname) = @_;
1098:
1099: if (!$symb) {
1100: $symb=&symbread();
1101: if (!$symb) { $symb= $ENV{'request.url'}; }
1102: }
1103: $symb=escape($symb);
1104:
1105: if (!$namespace) { $namespace=$ENV{'request.state'}; }
1106: #FIXME needs to do something for /pub resources
1107: if (!$domain) { $domain=$ENV{'user.domain'}; }
1108: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1109:
1110: my %returnhash;
1111: $namespace=~s/\//\_/g;
1112: $namespace=~s/\W//g;
1113: my %hash;
1114: my $path=$perlvar{'lonDaemons'}.'/tmp';
1115: if (tie(%hash,'GDBM_File',
1116: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1117: &GDBM_READER,0640)) {
1118: my $version=$hash{"version:$symb"};
1119: $returnhash{'version'}=$version;
1120: my $scope;
1121: for ($scope=1;$scope<=$version;$scope++) {
1122: my $vkeys=$hash{"$scope:keys:$symb"};
1123: my @keys=split(/:/,$vkeys);
1124: my $key;
1125: $returnhash{"$scope:keys"}=$vkeys;
1126: foreach $key (@keys) {
1127: $returnhash{"$scope:$key"}=$hash{"$scope:$symb:$key"};
1128: $returnhash{"$key"}=$hash{"$scope:$symb:$key"};
1129: }
1130: }
1131: if (!(untie(%hash))) {
1132: return "error:$!";
1133: }
1134: } else {
1135: return "error:$!";
1136: }
1137: return %returnhash;
1138: }
1139:
1140: # ----------------------------------------------------------------------- Store
1141:
1142: sub store {
1143: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1144: my $home='';
1145:
1146: if ($stuname) { $home=&homeserver($stuname,$domain); }
1147:
1148: $symb=&symbclean($symb);
1149: if (!$symb) { unless ($symb=&symbread()) { return ''; } }
1150:
1151: &devalidate($symb);
1152:
1153: $symb=escape($symb);
1154: if (!$namespace) {
1155: unless ($namespace=$ENV{'request.course.id'}) {
1156: return '';
1157: }
1158: }
1159: if (!$domain) { $domain=$ENV{'user.domain'}; }
1160: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1161: if (!$home) { $home=$ENV{'user.home'}; }
1162: my $namevalue='';
1163: foreach (keys %$storehash) {
1164: $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
1165: }
1166: $namevalue=~s/\&$//;
1167: &courselog($symb.':'.$stuname.':'.$domain.':STORE:'.$namevalue);
1168: return reply("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
1169: }
1170:
1171: # -------------------------------------------------------------- Critical Store
1172:
1173: sub cstore {
1174: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1175: my $home='';
1176:
1177: if ($stuname) { $home=&homeserver($stuname,$domain); }
1178:
1179: $symb=&symbclean($symb);
1180: if (!$symb) { unless ($symb=&symbread()) { return ''; } }
1181:
1182: &devalidate($symb);
1183:
1184: $symb=escape($symb);
1185: if (!$namespace) {
1186: unless ($namespace=$ENV{'request.course.id'}) {
1187: return '';
1188: }
1189: }
1190: if (!$domain) { $domain=$ENV{'user.domain'}; }
1191: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1192: if (!$home) { $home=$ENV{'user.home'}; }
1193:
1194: my $namevalue='';
1195: foreach (keys %$storehash) {
1196: $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
1197: }
1198: $namevalue=~s/\&$//;
1199: &courselog($symb.':'.$stuname.':'.$domain.':CSTORE:'.$namevalue);
1200: return critical
1201: ("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
1202: }
1203:
1204: # --------------------------------------------------------------------- Restore
1205:
1206: sub restore {
1207: my ($symb,$namespace,$domain,$stuname) = @_;
1208: my $home='';
1209:
1210: if ($stuname) { $home=&homeserver($stuname,$domain); }
1211:
1212: if (!$symb) {
1213: unless ($symb=escape(&symbread())) { return ''; }
1214: } else {
1215: $symb=&escape(&symbclean($symb));
1216: }
1217: if (!$namespace) {
1218: unless ($namespace=$ENV{'request.course.id'}) {
1219: return '';
1220: }
1221: }
1222: if (!$domain) { $domain=$ENV{'user.domain'}; }
1223: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1224: if (!$home) { $home=$ENV{'user.home'}; }
1225: my $answer=&reply("restore:$domain:$stuname:$namespace:$symb","$home");
1226:
1227: my %returnhash=();
1228: foreach (split(/\&/,$answer)) {
1229: my ($name,$value)=split(/\=/,$_);
1230: $returnhash{&unescape($name)}=&unescape($value);
1231: }
1232: my $version;
1233: for ($version=1;$version<=$returnhash{'version'};$version++) {
1234: foreach (split(/\:/,$returnhash{$version.':keys'})) {
1235: $returnhash{$_}=$returnhash{$version.':'.$_};
1236: }
1237: }
1238: return %returnhash;
1239: }
1240:
1241: # ---------------------------------------------------------- Course Description
1242:
1243: sub coursedescription {
1244: my $courseid=shift;
1245: $courseid=~s/^\///;
1246: $courseid=~s/\_/\//g;
1247: my ($cdomain,$cnum)=split(/\//,$courseid);
1248: my $chome=&homeserver($cnum,$cdomain);
1249: if ($chome ne 'no_host') {
1250: my %returnhash=&dump('environment',$cdomain,$cnum);
1251: if (!exists($returnhash{'con_lost'})) {
1252: my $normalid=$cdomain.'_'.$cnum;
1253: my %envhash=();
1254: $returnhash{'home'}= $chome;
1255: $returnhash{'domain'} = $cdomain;
1256: $returnhash{'num'} = $cnum;
1257: while (my ($name,$value) = each %returnhash) {
1258: $envhash{'course.'.$normalid.'.'.$name}=$value;
1259: }
1260: $returnhash{'url'}='/res/'.declutter($returnhash{'url'});
1261: $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
1262: $ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
1263: $envhash{'course.'.$normalid.'.last_cache'}=time;
1264: $envhash{'course.'.$normalid.'.home'}=$chome;
1265: $envhash{'course.'.$normalid.'.domain'}=$cdomain;
1266: $envhash{'course.'.$normalid.'.num'}=$cnum;
1267: &appenv(%envhash);
1268: return %returnhash;
1269: }
1270: }
1271: return ();
1272: }
1273:
1274: # -------------------------------------------------------- Get user privileges
1275:
1276: sub rolesinit {
1277: my ($domain,$username,$authhost)=@_;
1278: my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
1279: if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return ''; }
1280: my %allroles=();
1281: my %thesepriv=();
1282: my $now=time;
1283: my $userroles="user.login.time=$now\n";
1284: my $thesestr;
1285:
1286: if ($rolesdump ne '') {
1287: foreach (split(/&/,$rolesdump)) {
1288: if ($_!~/^rolesdef\&/) {
1289: my ($area,$role)=split(/=/,$_);
1290: $area=~s/\_\w\w$//;
1291: my ($trole,$tend,$tstart)=split(/_/,$role);
1292: $userroles.='user.role.'.$trole.'.'.$area.'='.
1293: $tstart.'.'.$tend."\n";
1294: if ($tend!=0) {
1295: if ($tend<$now) {
1296: $trole='';
1297: }
1298: }
1299: if ($tstart!=0) {
1300: if ($tstart>$now) {
1301: $trole='';
1302: }
1303: }
1304: if (($area ne '') && ($trole ne '')) {
1305: my $spec=$trole.'.'.$area;
1306: my ($tdummy,$tdomain,$trest)=split(/\//,$area);
1307: if ($trole =~ /^cr\//) {
1308: my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
1309: my $homsvr=homeserver($rauthor,$rdomain);
1310: if ($hostname{$homsvr} ne '') {
1311: my $roledef=
1312: reply("get:$rdomain:$rauthor:roles:rolesdef_$rrole",
1313: $homsvr);
1314: if (($roledef ne 'con_lost') && ($roledef ne '')) {
1315: my ($syspriv,$dompriv,$coursepriv)=
1316: split(/\_/,unescape($roledef));
1317: $allroles{'cm./'}.=':'.$syspriv;
1318: $allroles{$spec.'./'}.=':'.$syspriv;
1319: if ($tdomain ne '') {
1320: $allroles{'cm./'.$tdomain.'/'}.=':'.$dompriv;
1321: $allroles{$spec.'./'.$tdomain.'/'}.=':'.$dompriv;
1322: if ($trest ne '') {
1323: $allroles{'cm.'.$area}.=':'.$coursepriv;
1324: $allroles{$spec.'.'.$area}.=':'.$coursepriv;
1325: }
1326: }
1327: }
1328: }
1329: } else {
1330: $allroles{'cm./'}.=':'.$pr{$trole.':s'};
1331: $allroles{$spec.'./'}.=':'.$pr{$trole.':s'};
1332: if ($tdomain ne '') {
1333: $allroles{'cm./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
1334: $allroles{$spec.'./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
1335: if ($trest ne '') {
1336: $allroles{'cm.'.$area}.=':'.$pr{$trole.':c'};
1337: $allroles{$spec.'.'.$area}.=':'.$pr{$trole.':c'};
1338: }
1339: }
1340: }
1341: }
1342: }
1343: }
1344: my $adv=0;
1345: my $author=0;
1346: foreach (keys %allroles) {
1347: %thesepriv=();
1348: if (($_!~/^st/) && ($_!~/^ta/) && ($_!~/^cm/)) { $adv=1; }
1349: if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }
1350: foreach (split(/:/,$allroles{$_})) {
1351: if ($_ ne '') {
1352: my ($privilege,$restrictions)=split(/&/,$_);
1353: if ($restrictions eq '') {
1354: $thesepriv{$privilege}='F';
1355: } else {
1356: if ($thesepriv{$privilege} ne 'F') {
1357: $thesepriv{$privilege}.=$restrictions;
1358: }
1359: }
1360: }
1361: }
1362: $thesestr='';
1363: foreach (keys %thesepriv) { $thesestr.=':'.$_.'&'.$thesepriv{$_}; }
1364: $userroles.='user.priv.'.$_.'='.$thesestr."\n";
1365: }
1366: $userroles.='user.adv='.$adv."\n".
1367: 'user.author='.$author."\n";
1368: $ENV{'user.adv'}=$adv;
1369: }
1370: return $userroles;
1371: }
1372:
1373: # --------------------------------------------------------------- get interface
1374:
1375: sub get {
1376: my ($namespace,$storearr,$udomain,$uname)=@_;
1377: my $items='';
1378: foreach (@$storearr) {
1379: $items.=escape($_).'&';
1380: }
1381: $items=~s/\&$//;
1382: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1383: if (!$uname) { $uname=$ENV{'user.name'}; }
1384: my $uhome=&homeserver($uname,$udomain);
1385:
1386: my $rep=&reply("get:$udomain:$uname:$namespace:$items",$uhome);
1387: my @pairs=split(/\&/,$rep);
1388: my %returnhash=();
1389: my $i=0;
1390: foreach (@$storearr) {
1391: $returnhash{$_}=unescape($pairs[$i]);
1392: $i++;
1393: }
1394: return %returnhash;
1395: }
1396:
1397: # --------------------------------------------------------------- del interface
1398:
1399: sub del {
1400: my ($namespace,$storearr,$udomain,$uname)=@_;
1401: my $items='';
1402: foreach (@$storearr) {
1403: $items.=escape($_).'&';
1404: }
1405: $items=~s/\&$//;
1406: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1407: if (!$uname) { $uname=$ENV{'user.name'}; }
1408: my $uhome=&homeserver($uname,$udomain);
1409:
1410: return &reply("del:$udomain:$uname:$namespace:$items",$uhome);
1411: }
1412:
1413: # -------------------------------------------------------------- dump interface
1414:
1415: sub dump {
1416: my ($namespace,$udomain,$uname,$regexp)=@_;
1417: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1418: if (!$uname) { $uname=$ENV{'user.name'}; }
1419: my $uhome=&homeserver($uname,$udomain);
1420: if ($regexp) {
1421: $regexp=&escape($regexp);
1422: } else {
1423: $regexp='.';
1424: }
1425: my $rep=reply("dump:$udomain:$uname:$namespace:$regexp",$uhome);
1426: my @pairs=split(/\&/,$rep);
1427: my %returnhash=();
1428: foreach (@pairs) {
1429: my ($key,$value)=split(/=/,$_);
1430: $returnhash{unescape($key)}=unescape($value);
1431: }
1432: return %returnhash;
1433: }
1434:
1435: # --------------------------------------------------------------- put interface
1436:
1437: sub put {
1438: my ($namespace,$storehash,$udomain,$uname)=@_;
1439: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1440: if (!$uname) { $uname=$ENV{'user.name'}; }
1441: my $uhome=&homeserver($uname,$udomain);
1442: my $items='';
1443: foreach (keys %$storehash) {
1444: $items.=&escape($_).'='.&escape($$storehash{$_}).'&';
1445: }
1446: $items=~s/\&$//;
1447: return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
1448: }
1449:
1450: # ------------------------------------------------------ critical put interface
1451:
1452: sub cput {
1453: my ($namespace,$storehash,$udomain,$uname)=@_;
1454: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1455: if (!$uname) { $uname=$ENV{'user.name'}; }
1456: my $uhome=&homeserver($uname,$udomain);
1457: my $items='';
1458: foreach (keys %$storehash) {
1459: $items.=escape($_).'='.escape($$storehash{$_}).'&';
1460: }
1461: $items=~s/\&$//;
1462: return &critical("put:$udomain:$uname:$namespace:$items",$uhome);
1463: }
1464:
1465: # -------------------------------------------------------------- eget interface
1466:
1467: sub eget {
1468: my ($namespace,$storearr,$udomain,$uname)=@_;
1469: my $items='';
1470: foreach (@$storearr) {
1471: $items.=escape($_).'&';
1472: }
1473: $items=~s/\&$//;
1474: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1475: if (!$uname) { $uname=$ENV{'user.name'}; }
1476: my $uhome=&homeserver($uname,$udomain);
1477: my $rep=&reply("eget:$udomain:$uname:$namespace:$items",$uhome);
1478: my @pairs=split(/\&/,$rep);
1479: my %returnhash=();
1480: my $i=0;
1481: foreach (@$storearr) {
1482: $returnhash{$_}=unescape($pairs[$i]);
1483: $i++;
1484: }
1485: return %returnhash;
1486: }
1487:
1488: # ------------------------------------------------- Check for a user privilege
1489:
1490: sub allowed {
1491: my ($priv,$uri)=@_;
1492:
1493: my $orguri=$uri;
1494: $uri=&declutter($uri);
1495:
1496: # Free bre access to adm and meta resources
1497:
1498: if ((($uri=~/^adm\//) || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {
1499: return 'F';
1500: }
1501:
1502: # Free bre to public access
1503:
1504: if ($priv eq 'bre') {
1505: if (&metadata($uri,'copyright') eq 'public') { return 'F'; }
1506: }
1507:
1508: my $thisallowed='';
1509: my $statecond=0;
1510: my $courseprivid='';
1511:
1512: # Course
1513:
1514: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'}=~/$priv\&([^\:]*)/) {
1515: $thisallowed.=$1;
1516: }
1517:
1518: # Domain
1519:
1520: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
1521: =~/$priv\&([^\:]*)/) {
1522: $thisallowed.=$1;
1523: }
1524:
1525: # Course: uri itself is a course
1526: my $courseuri=$uri;
1527: $courseuri=~s/\_(\d)/\/$1/;
1528: $courseuri=~s/^([^\/])/\/$1/;
1529:
1530: if ($ENV{'user.priv.'.$ENV{'request.role'}.'.'.$courseuri}
1531: =~/$priv\&([^\:]*)/) {
1532: $thisallowed.=$1;
1533: }
1534:
1535: # Full access at system, domain or course-wide level? Exit.
1536:
1537: if ($thisallowed=~/F/) {
1538: return 'F';
1539: }
1540:
1541: # If this is generating or modifying users, exit with special codes
1542:
1543: if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:cca:'=~/\:$priv\:/) {
1544: return $thisallowed;
1545: }
1546: #
1547: # Gathered so far: system, domain and course wide privileges
1548: #
1549: # Course: See if uri or referer is an individual resource that is part of
1550: # the course
1551:
1552: if ($ENV{'request.course.id'}) {
1553: $courseprivid=$ENV{'request.course.id'};
1554: if ($ENV{'request.course.sec'}) {
1555: $courseprivid.='/'.$ENV{'request.course.sec'};
1556: }
1557: $courseprivid=~s/\_/\//;
1558: my $checkreferer=1;
1559: my @uriparts=split(/\//,$uri);
1560: my $filename=$uriparts[$#uriparts];
1561: my $pathname=$uri;
1562: $pathname=~s/\/$filename$//;
1563: if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
1564: /\&$filename\:([\d\|]+)\&/) {
1565: $statecond=$1;
1566: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
1567: =~/$priv\&([^\:]*)/) {
1568: $thisallowed.=$1;
1569: $checkreferer=0;
1570: }
1571: }
1572:
1573: if ($checkreferer) {
1574: my $refuri=$ENV{'httpref.'.$orguri};
1575:
1576: unless ($refuri) {
1577: foreach (keys %ENV) {
1578: if ($_=~/^httpref\..*\*/) {
1579: my $pattern=$_;
1580: $pattern=~s/^httpref\.\/res\///;
1581: $pattern=~s/\*/\[\^\/\]\+/g;
1582: $pattern=~s/\//\\\//g;
1583: if ($orguri=~/$pattern/) {
1584: $refuri=$ENV{$_};
1585: }
1586: }
1587: }
1588: }
1589: if ($refuri) {
1590: $refuri=&declutter($refuri);
1591: my @uriparts=split(/\//,$refuri);
1592: my $filename=$uriparts[$#uriparts];
1593: my $pathname=$refuri;
1594: $pathname=~s/\/$filename$//;
1595: if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
1596: /\&$filename\:([\d\|]+)\&/) {
1597: my $refstatecond=$1;
1598: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
1599: =~/$priv\&([^\:]*)/) {
1600: $thisallowed.=$1;
1601: $uri=$refuri;
1602: $statecond=$refstatecond;
1603: }
1604: }
1605: }
1606: }
1607: }
1608:
1609: #
1610: # Gathered now: all privileges that could apply, and condition number
1611: #
1612: #
1613: # Full or no access?
1614: #
1615:
1616: if ($thisallowed=~/F/) {
1617: return 'F';
1618: }
1619:
1620: unless ($thisallowed) {
1621: return '';
1622: }
1623:
1624: # Restrictions exist, deal with them
1625: #
1626: # C:according to course preferences
1627: # R:according to resource settings
1628: # L:unless locked
1629: # X:according to user session state
1630: #
1631:
1632: # Possibly locked functionality, check all courses
1633: # Locks might take effect only after 10 minutes cache expiration for other
1634: # courses, and 2 minutes for current course
1635:
1636: my $envkey;
1637: if ($thisallowed=~/L/) {
1638: foreach $envkey (keys %ENV) {
1639: if ($envkey=~/^user\.role\.(st|ta)\.([^\.]*)/) {
1640: my $courseid=$2;
1641: my $roleid=$1.'.'.$2;
1642: $courseid=~s/^\///;
1643: my $expiretime=600;
1644: if ($ENV{'request.role'} eq $roleid) {
1645: $expiretime=120;
1646: }
1647: my ($cdom,$cnum,$csec)=split(/\//,$courseid);
1648: my $prefix='course.'.$cdom.'_'.$cnum.'.';
1649: if ((time-$ENV{$prefix.'last_cache'})>$expiretime) {
1650: &coursedescription($courseid);
1651: }
1652: if (($ENV{$prefix.'res.'.$uri.'.lock.sections'}=~/\,$csec\,/)
1653: || ($ENV{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {
1654: if ($ENV{$prefix.'res.'.$uri.'.lock.expire'}>time) {
1655: &log($ENV{'user.domain'},$ENV{'user.name'},
1656: $ENV{'user.host'},
1657: 'Locked by res: '.$priv.' for '.$uri.' due to '.
1658: $cdom.'/'.$cnum.'/'.$csec.' expire '.
1659: $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
1660: return '';
1661: }
1662: }
1663: if (($ENV{$prefix.'priv.'.$priv.'.lock.sections'}=~/\,$csec\,/)
1664: || ($ENV{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {
1665: if ($ENV{'priv.'.$priv.'.lock.expire'}>time) {
1666: &log($ENV{'user.domain'},$ENV{'user.name'},
1667: $ENV{'user.host'},
1668: 'Locked by priv: '.$priv.' for '.$uri.' due to '.
1669: $cdom.'/'.$cnum.'/'.$csec.' expire '.
1670: $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
1671: return '';
1672: }
1673: }
1674: }
1675: }
1676: }
1677:
1678: #
1679: # Rest of the restrictions depend on selected course
1680: #
1681:
1682: unless ($ENV{'request.course.id'}) {
1683: return '1';
1684: }
1685:
1686: #
1687: # Now user is definitely in a course
1688: #
1689:
1690:
1691: # Course preferences
1692:
1693: if ($thisallowed=~/C/) {
1694: my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
1695: if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.roles.denied'}
1696: =~/$rolecode/) {
1697: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
1698: 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.
1699: $ENV{'request.course.id'});
1700: return '';
1701: }
1702: }
1703:
1704: # Resource preferences
1705:
1706: if ($thisallowed=~/R/) {
1707: my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
1708: my $filename=$perlvar{'lonDocRoot'}.'/res/'.$uri.'.meta';
1709: if (-e $filename) {
1710: my @content;
1711: {
1712: my $fh=Apache::File->new($filename);
1713: @content=<$fh>;
1714: }
1715: if (join('',@content)=~
1716: /\<roledeny[^\>]*\>[^\<]*$rolecode[^\<]*\<\/roledeny\>/) {
1717: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
1718: 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);
1719: return '';
1720:
1721: }
1722: }
1723: }
1724:
1725: # Restricted by state?
1726:
1727: if ($thisallowed=~/X/) {
1728: if (&condval($statecond)) {
1729: return '2';
1730: } else {
1731: return '';
1732: }
1733: }
1734:
1735: return 'F';
1736: }
1737:
1738: # ----------------------------------------------------------------- Define Role
1739:
1740: sub definerole {
1741: if (allowed('mcr','/')) {
1742: my ($rolename,$sysrole,$domrole,$courole)=@_;
1743: foreach (split('/',$sysrole)) {
1744: my ($crole,$cqual)=split(/\&/,$_);
1745: if ($pr{'cr:s'}!~/$crole/) { return "refused:s:$crole"; }
1746: if ($pr{'cr:s'}=~/$crole\&/) {
1747: if ($pr{'cr:s'}!~/$crole\&\w*$cqual/) {
1748: return "refused:s:$crole&$cqual";
1749: }
1750: }
1751: }
1752: foreach (split('/',$domrole)) {
1753: my ($crole,$cqual)=split(/\&/,$_);
1754: if ($pr{'cr:d'}!~/$crole/) { return "refused:d:$crole"; }
1755: if ($pr{'cr:d'}=~/$crole\&/) {
1756: if ($pr{'cr:d'}!~/$crole\&\w*$cqual/) {
1757: return "refused:d:$crole&$cqual";
1758: }
1759: }
1760: }
1761: foreach (split('/',$courole)) {
1762: my ($crole,$cqual)=split(/\&/,$_);
1763: if ($pr{'cr:c'}!~/$crole/) { return "refused:c:$crole"; }
1764: if ($pr{'cr:c'}=~/$crole\&/) {
1765: if ($pr{'cr:c'}!~/$crole\&\w*$cqual/) {
1766: return "refused:c:$crole&$cqual";
1767: }
1768: }
1769: }
1770: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
1771: "$ENV{'user.domain'}:$ENV{'user.name'}:".
1772: "rolesdef_$rolename=".
1773: escape($sysrole.'_'.$domrole.'_'.$courole);
1774: return reply($command,$ENV{'user.home'});
1775: } else {
1776: return 'refused';
1777: }
1778: }
1779:
1780: # ---------------- Make a metadata query against the network of library servers
1781:
1782: sub metadata_query {
1783: my ($query,$custom,$customshow)=@_;
1784: my %rhash;
1785: for my $server (keys %libserv) {
1786: unless ($custom or $customshow) {
1787: my $reply=&reply("querysend:".&escape($query),$server);
1788: $rhash{$server}=$reply;
1789: }
1790: else {
1791: my $reply=&reply("querysend:".&escape($query).':'.
1792: &escape($custom).':'.&escape($customshow),
1793: $server);
1794: $rhash{$server}=$reply;
1795: }
1796: }
1797: return \%rhash;
1798: }
1799:
1800: # ------------------------------------------------------------------ Plain Text
1801:
1802: sub plaintext {
1803: my $short=shift;
1804: return $prp{$short};
1805: }
1806:
1807: # ----------------------------------------------------------------- Assign Role
1808:
1809: sub assignrole {
1810: my ($udom,$uname,$url,$role,$end,$start)=@_;
1811: my $mrole;
1812: if ($role =~ /^cr\//) {
1813: unless (&allowed('ccr',$url)) {
1814: &logthis('Refused custom assignrole: '.
1815: $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
1816: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
1817: return 'refused';
1818: }
1819: $mrole='cr';
1820: } else {
1821: my $cwosec=$url;
1822: $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
1823: unless (&allowed('c'.$role,$cwosec)) {
1824: &logthis('Refused assignrole: '.
1825: $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
1826: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
1827: return 'refused';
1828: }
1829: $mrole=$role;
1830: }
1831: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
1832: "$udom:$uname:$url".'_'."$mrole=$role";
1833: if ($end) { $command.='_'.$end; }
1834: if ($start) {
1835: if ($end) {
1836: $command.='_'.$start;
1837: } else {
1838: $command.='_0_'.$start;
1839: }
1840: }
1841: return &reply($command,&homeserver($uname,$udom));
1842: }
1843:
1844: # -------------------------------------------------- Modify user authentication
1845: # Overrides without validation
1846:
1847: sub modifyuserauth {
1848: my ($udom,$uname,$umode,$upass)=@_;
1849: my $uhome=&homeserver($uname,$udom);
1850: unless (&allowed('mau',$udom)) { return 'refused'; }
1851: &logthis('Call to modify user authentication '.$udom.', '.$uname.', '.
1852: $umode.' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'});
1853: my $reply=&reply('encrypt:changeuserauth:'.$udom.':'.$uname.':'.$umode.':'.
1854: &escape($upass),$uhome);
1855: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},
1856: 'Authentication changed for '.$udom.', '.$uname.', '.$umode.
1857: '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
1858: &log($udom,,$uname,$uhome,
1859: 'Authentication changed by '.$ENV{'user.domain'}.', '.
1860: $ENV{'user.name'}.', '.$umode.
1861: '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
1862: unless ($reply eq 'ok') {
1863: &logthis('Authentication mode error: '.$reply);
1864: return 'error: '.$reply;
1865: }
1866: return 'ok';
1867: }
1868:
1869: # --------------------------------------------------------------- Modify a user
1870:
1871: sub modifyuser {
1872: my ($udom, $uname, $uid,
1873: $umode, $upass, $first,
1874: $middle, $last, $gene,
1875: $forceid, $desiredhome)=@_;
1876: $udom=~s/\W//g;
1877: $uname=~s/\W//g;
1878: &logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.
1879: $umode.', '.$first.', '.$middle.', '.
1880: $last.', '.$gene.'(forceid: '.$forceid.')'.
1881: (defined($desiredhome) ? ' desiredhome = '.$desiredhome :
1882: ' desiredhome not specified').
1883: ' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'});
1884: my $uhome=&homeserver($uname,$udom,'true');
1885: # ----------------------------------------------------------------- Create User
1886: if (($uhome eq 'no_host') && ($umode) && ($upass)) {
1887: my $unhome='';
1888: if (defined($desiredhome) && $hostdom{$desiredhome} eq $udom) {
1889: $unhome = $desiredhome;
1890: } elsif($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $udom) {
1891: $unhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
1892: } else { # load balancing routine for determining $unhome
1893: my $tryserver;
1894: my $loadm=10000000;
1895: foreach $tryserver (keys %libserv) {
1896: if ($hostdom{$tryserver} eq $udom) {
1897: my $answer=reply('load',$tryserver);
1898: if (($answer=~/\d+/) && ($answer<$loadm)) {
1899: $loadm=$answer;
1900: $unhome=$tryserver;
1901: }
1902: }
1903: }
1904: }
1905: if (($unhome eq '') || ($unhome eq 'no_host')) {
1906: return 'error: unable to find a home server for '.$uname.
1907: ' in domain '.$udom;
1908: }
1909: my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':'.$umode.':'.
1910: &escape($upass),$unhome);
1911: unless ($reply eq 'ok') {
1912: return 'error: '.$reply;
1913: }
1914: $uhome=&homeserver($uname,$udom,'true');
1915: if (($uhome eq '') || ($uhome eq 'no_host') || ($uhome ne $unhome)) {
1916: return 'error: verify home';
1917: }
1918: } # End of creation of new user
1919: # ---------------------------------------------------------------------- Add ID
1920: if ($uid) {
1921: $uid=~tr/A-Z/a-z/;
1922: my %uidhash=&idrget($udom,$uname);
1923: if (($uidhash{$uname}) && ($uidhash{$uname}!~/error\:/)
1924: && (!$forceid)) {
1925: unless ($uid eq $uidhash{$uname}) {
1926: return 'error: mismatch '.$uidhash{$uname}.' versus '.$uid;
1927: }
1928: } else {
1929: &idput($udom,($uname => $uid));
1930: }
1931: }
1932: # -------------------------------------------------------------- Add names, etc
1933: my %names=&get('environment',
1934: ['firstname','middlename','lastname','generation'],
1935: $udom,$uname);
1936: if ($names{'firstname'} =~ m/^error:.*/) { %names=(); }
1937: if ($first) { $names{'firstname'} = $first; }
1938: if ($middle) { $names{'middlename'} = $middle; }
1939: if ($last) { $names{'lastname'} = $last; }
1940: if ($gene) { $names{'generation'} = $gene; }
1941: my $reply = &put('environment', \%names, $udom,$uname);
1942: if ($reply ne 'ok') { return 'error: '.$reply; }
1943: &logthis('Success modifying user '.$udom.', '.$uname.', '.$uid.', '.
1944: $umode.', '.$first.', '.$middle.', '.
1945: $last.', '.$gene.' by '.
1946: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
1947: return 'ok';
1948: }
1949:
1950: # -------------------------------------------------------------- Modify student
1951:
1952: sub modifystudent {
1953: my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,
1954: $end,$start,$forceid,$desiredhome)=@_;
1955: my $cid='';
1956: unless ($cid=$ENV{'request.course.id'}) {
1957: return 'not_in_class';
1958: }
1959: # --------------------------------------------------------------- Make the user
1960: my $reply=&modifyuser
1961: ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$forceid,
1962: $desiredhome);
1963: unless ($reply eq 'ok') { return $reply; }
1964: my $uhome=&homeserver($uname,$udom);
1965: if (($uhome eq '') || ($uhome eq 'no_host')) {
1966: return 'error: no such user';
1967: }
1968: # -------------------------------------------------- Add student to course list
1969: $reply=critical('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
1970: $ENV{'course.'.$cid.'.num'}.':classlist:'.
1971: &escape($uname.':'.$udom).'='.
1972: &escape($end.':'.$start),
1973: $ENV{'course.'.$cid.'.home'});
1974: unless (($reply eq 'ok') || ($reply eq 'delayed')) {
1975: return 'error: '.$reply;
1976: }
1977: # ---------------------------------------------------- Add student role to user
1978: my $uurl='/'.$cid;
1979: $uurl=~s/\_/\//g;
1980: if ($usec) {
1981: $uurl.='/'.$usec;
1982: }
1983: return &assignrole($udom,$uname,$uurl,'st',$end,$start);
1984: }
1985:
1986: # ------------------------------------------------- Write to course preferences
1987:
1988: sub writecoursepref {
1989: my ($courseid,%prefs)=@_;
1990: $courseid=~s/^\///;
1991: $courseid=~s/\_/\//g;
1992: my ($cdomain,$cnum)=split(/\//,$courseid);
1993: my $chome=homeserver($cnum,$cdomain);
1994: if (($chome eq '') || ($chome eq 'no_host')) {
1995: return 'error: no such course';
1996: }
1997: my $cstring='';
1998: foreach (keys %prefs) {
1999: $cstring.=escape($_).'='.escape($prefs{$_}).'&';
2000: }
2001: $cstring=~s/\&$//;
2002: return reply('put:'.$cdomain.':'.$cnum.':environment:'.$cstring,$chome);
2003: }
2004:
2005: # ---------------------------------------------------------- Make/modify course
2006:
2007: sub createcourse {
2008: my ($udom,$description,$url)=@_;
2009: $url=&declutter($url);
2010: my $cid='';
2011: unless (&allowed('ccc',$ENV{'user.domain'})) {
2012: return 'refused';
2013: }
2014: unless ($udom eq $ENV{'user.domain'}) {
2015: return 'refused';
2016: }
2017: # ------------------------------------------------------------------- Create ID
2018: my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
2019: unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
2020: # ----------------------------------------------- Make sure that does not exist
2021: my $uhome=&homeserver($uname,$udom,'true');
2022: unless (($uhome eq '') || ($uhome eq 'no_host')) {
2023: $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
2024: unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
2025: $uhome=&homeserver($uname,$udom,'true');
2026: unless (($uhome eq '') || ($uhome eq 'no_host')) {
2027: return 'error: unable to generate unique course-ID';
2028: }
2029: }
2030: # ------------------------------------------------------------- Make the course
2031: my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
2032: $ENV{'user.home'});
2033: unless ($reply eq 'ok') { return 'error: '.$reply; }
2034: $uhome=&homeserver($uname,$udom,'true');
2035: if (($uhome eq '') || ($uhome eq 'no_host')) {
2036: return 'error: no such course';
2037: }
2038: &writecoursepref($udom.'_'.$uname,
2039: ('description' => $description,
2040: 'url' => $url));
2041: return '/'.$udom.'/'.$uname;
2042: }
2043:
2044: # ---------------------------------------------------------- Assign Custom Role
2045:
2046: sub assigncustomrole {
2047: my ($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start)=@_;
2048: return &assignrole($udom,$uname,$url,'cr/'.$rdom.'/'.$rnam.'/'.$rolename,
2049: $end,$start);
2050: }
2051:
2052: # ----------------------------------------------------------------- Revoke Role
2053:
2054: sub revokerole {
2055: my ($udom,$uname,$url,$role)=@_;
2056: my $now=time;
2057: return &assignrole($udom,$uname,$url,$role,$now);
2058: }
2059:
2060: # ---------------------------------------------------------- Revoke Custom Role
2061:
2062: sub revokecustomrole {
2063: my ($udom,$uname,$url,$rdom,$rnam,$rolename)=@_;
2064: my $now=time;
2065: return &assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$now);
2066: }
2067:
2068: # ------------------------------------------------------------ Directory lister
2069:
2070: sub dirlist {
2071: my $uri=shift;
2072: $uri=~s/^\///;
2073: $uri=~s/\/$//;
2074: my ($res,$udom,$uname,@rest)=split(/\//,$uri);
2075: if ($udom) {
2076: if ($uname) {
2077: my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/'.$uri,
2078: homeserver($uname,$udom));
2079: return split(/:/,$listing);
2080: } else {
2081: my $tryserver;
2082: my %allusers=();
2083: foreach $tryserver (keys %libserv) {
2084: if ($hostdom{$tryserver} eq $udom) {
2085: my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.$udom,
2086: $tryserver);
2087: if (($listing ne 'no_such_dir') && ($listing ne 'empty')
2088: && ($listing ne 'con_lost')) {
2089: foreach (split(/:/,$listing)) {
2090: my ($entry,@stat)=split(/&/,$_);
2091: $allusers{$entry}=1;
2092: }
2093: }
2094: }
2095: }
2096: my $alluserstr='';
2097: foreach (sort keys %allusers) {
2098: $alluserstr.=$_.'&user:';
2099: }
2100: $alluserstr=~s/:$//;
2101: return split(/:/,$alluserstr);
2102: }
2103: } else {
2104: my $tryserver;
2105: my %alldom=();
2106: foreach $tryserver (keys %libserv) {
2107: $alldom{$hostdom{$tryserver}}=1;
2108: }
2109: my $alldomstr='';
2110: foreach (sort keys %alldom) {
2111: $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
2112: }
2113: $alldomstr=~s/:$//;
2114: return split(/:/,$alldomstr);
2115: }
2116: }
2117:
2118: # -------------------------------------------------------- Value of a Condition
2119:
2120: sub directcondval {
2121: my $number=shift;
2122: if ($ENV{'user.state.'.$ENV{'request.course.id'}}) {
2123: return substr($ENV{'user.state.'.$ENV{'request.course.id'}},$number,1);
2124: } else {
2125: return 2;
2126: }
2127: }
2128:
2129: sub condval {
2130: my $condidx=shift;
2131: my $result=0;
2132: my $allpathcond='';
2133: foreach (split(/\|/,$condidx)) {
2134: if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_})) {
2135: $allpathcond.=
2136: '('.$ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_}.')|';
2137: }
2138: }
2139: $allpathcond=~s/\|$//;
2140: if ($ENV{'request.course.id'}) {
2141: if ($allpathcond) {
2142: my $operand='|';
2143: my @stack;
2144: foreach ($allpathcond=~/(\d+|\(|\)|\&|\|)/g) {
2145: if ($_ eq '(') {
2146: push @stack,($operand,$result)
2147: } elsif ($_ eq ')') {
2148: my $before=pop @stack;
2149: if (pop @stack eq '&') {
2150: $result=$result>$before?$before:$result;
2151: } else {
2152: $result=$result>$before?$result:$before;
2153: }
2154: } elsif (($_ eq '&') || ($_ eq '|')) {
2155: $operand=$_;
2156: } else {
2157: my $new=directcondval($_);
2158: if ($operand eq '&') {
2159: $result=$result>$new?$new:$result;
2160: } else {
2161: $result=$result>$new?$result:$new;
2162: }
2163: }
2164: }
2165: }
2166: }
2167: return $result;
2168: }
2169:
2170: # --------------------------------------------------- Course Resourcedata Query
2171:
2172: sub courseresdata {
2173: my ($coursenum,$coursedomain,@which)=@_;
2174: my $coursehom=&homeserver($coursenum,$coursedomain);
2175: my $hashid=$coursenum.':'.$coursedomain;
2176: unless (defined($courseresdatacache{$hashid.'.time'})) {
2177: unless (time-$courseresdatacache{$hashid.'.time'}<300) {
2178: my $coursehom=&homeserver($coursenum,$coursedomain);
2179: if ($coursehom) {
2180: my $dumpreply=&reply('dump:'.$coursedomain.':'.$coursenum.
2181: ':resourcedata:.',$coursehom);
2182: unless ($dumpreply=~/^error\:/) {
2183: $courseresdatacache{$hashid.'.time'}=time;
2184: $courseresdatacache{$hashid}=$dumpreply;
2185: }
2186: }
2187: }
2188: }
2189: my @pairs=split(/\&/,$courseresdatacache{$hashid});
2190: my %returnhash=();
2191: foreach (@pairs) {
2192: my ($key,$value)=split(/=/,$_);
2193: $returnhash{unescape($key)}=unescape($value);
2194: }
2195: my $item;
2196: foreach $item (@which) {
2197: if ($returnhash{$item}) { return $returnhash{$item}; }
2198: }
2199: return '';
2200: }
2201:
2202: # --------------------------------------------------------- Value of a Variable
2203:
2204: sub EXT {
2205: my ($varname,$symbparm,$udom,$uname)=@_;
2206:
2207: unless ($varname) { return ''; }
2208:
2209: #get real user name/domain, courseid and symb
2210: my $courseid;
2211: if (!($uname && $udom)) {
2212: (my $cursymb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
2213: if (!$symbparm) { $symbparm=$cursymb; }
2214: } else {
2215: $courseid=$ENV{'request.course.id'};
2216: }
2217:
2218: my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
2219: my $rest;
2220: if ($therest[0]) {
2221: $rest=join('.',@therest);
2222: } else {
2223: $rest='';
2224: }
2225: my $qualifierrest=$qualifier;
2226: if ($rest) { $qualifierrest.='.'.$rest; }
2227: my $spacequalifierrest=$space;
2228: if ($qualifierrest) { $spacequalifierrest.='.'.$qualifierrest; }
2229: if ($realm eq 'user') {
2230: # --------------------------------------------------------------- user.resource
2231: if ($space eq 'resource') {
2232: my %restored=&restore(undef,undef,$udom,$uname);
2233: return $restored{$qualifierrest};
2234: # ----------------------------------------------------------------- user.access
2235: } elsif ($space eq 'access') {
2236: # FIXME - not supporting calls for a specific user
2237: return &allowed($qualifier,$rest);
2238: # ------------------------------------------ user.preferences, user.environment
2239: } elsif (($space eq 'preferences') || ($space eq 'environment')) {
2240: if (($uname eq $ENV{'user.name'}) &&
2241: ($udom eq $ENV{'user.domain'})) {
2242: return $ENV{join('.',('environment',$qualifierrest))};
2243: } else {
2244: my %returnhash=&userenvironment($udom,$uname,$qualifierrest);
2245: return $returnhash{$qualifierrest};
2246: }
2247: # ----------------------------------------------------------------- user.course
2248: } elsif ($space eq 'course') {
2249: # FIXME - not supporting calls for a specific user
2250: return $ENV{join('.',('request.course',$qualifier))};
2251: # ------------------------------------------------------------------- user.role
2252: } elsif ($space eq 'role') {
2253: # FIXME - not supporting calls for a specific user
2254: my ($role,$where)=split(/\./,$ENV{'request.role'});
2255: if ($qualifier eq 'value') {
2256: return $role;
2257: } elsif ($qualifier eq 'extent') {
2258: return $where;
2259: }
2260: # ----------------------------------------------------------------- user.domain
2261: } elsif ($space eq 'domain') {
2262: return $udom;
2263: # ------------------------------------------------------------------- user.name
2264: } elsif ($space eq 'name') {
2265: return $uname;
2266: # ---------------------------------------------------- Any other user namespace
2267: } else {
2268: my $item=($rest)?$qualifier.'.'.$rest:$qualifier;
2269: my %reply=&get($space,[$item]);
2270: return $reply{$item};
2271: }
2272: } elsif ($realm eq 'request') {
2273: # ------------------------------------------------------------- request.browser
2274: if ($space eq 'browser') {
2275: return $ENV{'browser.'.$qualifier};
2276: # ------------------------------------------------------------ request.filename
2277: } else {
2278: return $ENV{'request.'.$spacequalifierrest};
2279: }
2280: } elsif ($realm eq 'course') {
2281: # ---------------------------------------------------------- course.description
2282: return $ENV{'course.'.$courseid.'.'.$spacequalifierrest};
2283: } elsif ($realm eq 'resource') {
2284:
2285: if ($courseid eq $ENV{'request.course.id'}) {
2286:
2287: #print '<br>'.$space.' - '.$qualifier.' - '.$spacequalifierrest;
2288:
2289: # ----------------------------------------------------- Cascading lookup scheme
2290: if (!$symbparm) { $symbparm=&symbread(); }
2291: my $symbp=$symbparm;
2292: my $mapp=(split(/\_\_\_/,$symbp))[0];
2293:
2294: my $symbparm=$symbp.'.'.$spacequalifierrest;
2295: my $mapparm=$mapp.'___(all).'.$spacequalifierrest;
2296:
2297: my $section;
2298: if (($ENV{'user.name'} eq $uname) &&
2299: ($ENV{'user.domain'} eq $udom)) {
2300: $section={'request.course.sec'};
2301: } else {
2302: $section=&usection($udom,$uname,$courseid);
2303: }
2304:
2305: my $seclevel=$courseid.'.['.$section.'].'.$spacequalifierrest;
2306: my $seclevelr=$courseid.'.['.$section.'].'.$symbparm;
2307: my $seclevelm=$courseid.'.['.$section.'].'.$mapparm;
2308:
2309: my $courselevel=$courseid.'.'.$spacequalifierrest;
2310: my $courselevelr=$courseid.'.'.$symbparm;
2311: my $courselevelm=$courseid.'.'.$mapparm;
2312:
2313: # ----------------------------------------------------------- first, check user
2314: my %resourcedata=&get('resourcedata',
2315: [$courselevelr,$courselevelm,$courselevel],
2316: $udom,$uname);
2317: if (($resourcedata{$courselevelr}!~/^error\:/) &&
2318: ($resourcedata{$courselevelr}!~/^con_lost/)) {
2319:
2320: if ($resourcedata{$courselevelr}) {
2321: return $resourcedata{$courselevelr}; }
2322: if ($resourcedata{$courselevelm}) {
2323: return $resourcedata{$courselevelm}; }
2324: if ($resourcedata{$courselevel}) {
2325: return $resourcedata{$courselevel}; }
2326: } else {
2327: if ($resourcedata{$courselevelr}!~/No such file/) {
2328: &logthis("<font color=blue>WARNING:".
2329: " Trying to get resource data for ".
2330: $uname." at ".$udom.": ".
2331: $resourcedata{$courselevelr}."</font>");
2332: }
2333: }
2334:
2335: # -------------------------------------------------------- second, check course
2336:
2337: my $coursereply=&courseresdata($ENV{'course.'.$courseid.'.num'},
2338: $ENV{'course.'.$courseid.'.domain'},
2339: ($seclevelr,$seclevelm,$seclevel,
2340: $courselevelr,$courselevelm,
2341: $courselevel));
2342: if ($coursereply) { return $coursereply; }
2343:
2344: # ------------------------------------------------------ third, check map parms
2345: my %parmhash=();
2346: my $thisparm='';
2347: if (tie(%parmhash,'GDBM_File',
2348: $ENV{'request.course.fn'}.'_parms.db',
2349: &GDBM_READER,0640)) {
2350: $thisparm=$parmhash{$symbparm};
2351: untie(%parmhash);
2352: }
2353: if ($thisparm) { return $thisparm; }
2354: }
2355: # --------------------------------------------- last, look in resource metadata
2356:
2357: $spacequalifierrest=~s/\./\_/;
2358: my $metadata=&metadata($ENV{'request.filename'},$spacequalifierrest);
2359: if ($metadata) { return $metadata; }
2360: $metadata=&metadata($ENV{'request.filename'},
2361: 'parameter_'.$spacequalifierrest);
2362: if ($metadata) { return $metadata; }
2363:
2364: # ------------------------------------------------------------------ Cascade up
2365: unless ($space eq '0') {
2366: my ($part,$id)=split(/\_/,$space);
2367: if ($id) {
2368: my $partgeneral=&EXT('resource.'.$part.'.'.$qualifierrest,
2369: $symbparm,$udom,$uname);
2370: if ($partgeneral) { return $partgeneral; }
2371: } else {
2372: my $resourcegeneral=&EXT('resource.0.'.$qualifierrest,
2373: $symbparm,$udom,$uname);
2374: if ($resourcegeneral) { return $resourcegeneral; }
2375: }
2376: }
2377:
2378: # ---------------------------------------------------- Any other user namespace
2379: } elsif ($realm eq 'environment') {
2380: # ----------------------------------------------------------------- environment
2381: if (($uname eq $ENV{'user.name'})&&($udom eq $ENV{'user.domain'})) {
2382: return $ENV{'environment.'.$spacequalifierrest};
2383: } else {
2384: my %returnhash=&userenvironment($udom,$uname,
2385: $spacequalifierrest);
2386: return $returnhash{$spacequalifierrest};
2387: }
2388: } elsif ($realm eq 'system') {
2389: # ----------------------------------------------------------------- system.time
2390: if ($space eq 'time') {
2391: return time;
2392: }
2393: }
2394: return '';
2395: }
2396:
2397: # ---------------------------------------------------------------- Get metadata
2398:
2399: sub metadata {
2400: my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
2401:
2402: $uri=&declutter($uri);
2403: my $filename=$uri;
2404: $uri=~s/\.meta$//;
2405: #
2406: # Is the metadata already cached?
2407: # Look at timestamp of caching
2408: # Everything is cached by the main uri, libraries are never directly cached
2409: #
2410: unless (abs($metacache{$uri.':cachedtimestamp'}-time)<600) {
2411: #
2412: # Is this a recursive call for a library?
2413: #
2414: if ($liburi) {
2415: $liburi=&declutter($liburi);
2416: $filename=$liburi;
2417: }
2418: my %metathesekeys=();
2419: unless ($filename=~/\.meta$/) { $filename.='.meta'; }
2420: my $metastring=&getfile($perlvar{'lonDocRoot'}.'/res/'.$filename);
2421: my $parser=HTML::LCParser->new(\$metastring);
2422: my $token;
2423: undef %metathesekeys;
2424: while ($token=$parser->get_token) {
2425: if ($token->[0] eq 'S') {
2426: if (defined($token->[2]->{'package'})) {
2427: #
2428: # This is a package - get package info
2429: #
2430: my $package=$token->[2]->{'package'};
2431: my $keyroot='';
2432: if ($prefix) {
2433: $keyroot.='_'.$prefix;
2434: } else {
2435: if (defined($token->[2]->{'part'})) {
2436: $keyroot.='_'.$token->[2]->{'part'};
2437: }
2438: }
2439: if (defined($token->[2]->{'id'})) {
2440: $keyroot.='_'.$token->[2]->{'id'};
2441: }
2442: if ($metacache{$uri.':packages'}) {
2443: $metacache{$uri.':packages'}.=','.$package.$keyroot;
2444: } else {
2445: $metacache{$uri.':packages'}=$package.$keyroot;
2446: }
2447: foreach (keys %packagetab) {
2448: if ($_=~/^$package\&/) {
2449: my ($pack,$name,$subp)=split(/\&/,$_);
2450: my $value=$packagetab{$_};
2451: my $part=$keyroot;
2452: $part=~s/^\_//;
2453: if ($subp eq 'display') {
2454: $value.=' [Part: '.$part.']';
2455: }
2456: my $unikey='parameter'.$keyroot.'_'.$name;
2457: $metathesekeys{$unikey}=1;
2458: $metacache{$uri.':'.$unikey.'.part'}=$part;
2459: unless
2460: (defined($metacache{$uri.':'.$unikey.'.'.$subp})) {
2461: $metacache{$uri.':'.$unikey.'.'.$subp}=$value;
2462: }
2463: }
2464: }
2465: } else {
2466: #
2467: # This is not a package - some other kind of start tag
2468: #
2469: my $entry=$token->[1];
2470: my $unikey;
2471: if ($entry eq 'import') {
2472: $unikey='';
2473: } else {
2474: $unikey=$entry;
2475: }
2476: if ($prefix) {
2477: $unikey.=$prefix;
2478: } else {
2479: if (defined($token->[2]->{'part'})) {
2480: $unikey.='_'.$token->[2]->{'part'};
2481: }
2482: }
2483: if (defined($token->[2]->{'id'})) {
2484: $unikey.='_'.$token->[2]->{'id'};
2485: }
2486:
2487: if ($entry eq 'import') {
2488: #
2489: # Importing a library here
2490: #
2491: if (defined($depthcount)) { $depthcount++; } else
2492: { $depthcount=0; }
2493: if ($depthcount<20) {
2494: foreach (split(/\,/,&metadata($uri,'keys',
2495: $parser->get_text('/import'),$unikey,
2496: $depthcount))) {
2497: $metathesekeys{$_}=1;
2498: }
2499: }
2500: } else {
2501:
2502: if (defined($token->[2]->{'name'})) {
2503: $unikey.='_'.$token->[2]->{'name'};
2504: }
2505: $metathesekeys{$unikey}=1;
2506: foreach (@{$token->[3]}) {
2507: $metacache{$uri.':'.$unikey.'.'.$_}=$token->[2]->{$_};
2508: }
2509: unless (
2510: $metacache{$uri.':'.$unikey}=&HTML::Entities::decode($parser->get_text('/'.$entry))
2511: ) { $metacache{$uri.':'.$unikey}=
2512: $metacache{$uri.':'.$unikey.'.default'};
2513: }
2514: # end of not-a-package not-a-library import
2515: }
2516: # end of not-a-package start tag
2517: }
2518: # the next is the end of "start tag"
2519: }
2520: }
2521: $metacache{$uri.':keys'}=join(',',keys %metathesekeys);
2522: $metacache{$uri.':cachedtimestamp'}=time;
2523: # this is the end of "was not already recently cached
2524: }
2525: return $metacache{$uri.':'.$what};
2526: }
2527:
2528: # ------------------------------------------------- Update symbolic store links
2529:
2530: sub symblist {
2531: my ($mapname,%newhash)=@_;
2532: $mapname=declutter($mapname);
2533: my %hash;
2534: if (($ENV{'request.course.fn'}) && (%newhash)) {
2535: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
2536: &GDBM_WRCREAT,0640)) {
2537: foreach (keys %newhash) {
2538: $hash{declutter($_)}=$mapname.'___'.$newhash{$_};
2539: }
2540: if (untie(%hash)) {
2541: return 'ok';
2542: }
2543: }
2544: }
2545: return 'error';
2546: }
2547:
2548: # --------------------------------------------------------------- Verify a symb
2549:
2550: sub symbverify {
2551: my ($symb,$thisfn)=@_;
2552: $thisfn=&declutter($thisfn);
2553: # direct jump to resource in page or to a sequence - will construct own symbs
2554: if ($thisfn=~/\.(page|sequence)$/) { return 1; }
2555: # check URL part
2556: my ($map,$resid,$url)=split(/\_\_\_/,$symb);
2557: unless (&symbclean($url) eq &symbclean($thisfn)) { return 0; }
2558:
2559: $symb=&symbclean($symb);
2560:
2561: my %bighash;
2562: my $okay=0;
2563: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
2564: &GDBM_READER,0640)) {
2565: my $ids=$bighash{'ids_/res/'.$thisfn};
2566: unless ($ids) {
2567: $ids=$bighash{'ids_/'.$thisfn};
2568: }
2569: if ($ids) {
2570: # ------------------------------------------------------------------- Has ID(s)
2571: foreach (split(/\,/,$ids)) {
2572: my ($mapid,$resid)=split(/\./,$_);
2573: if (
2574: &symbclean(&declutter($bighash{'map_id_'.$mapid}).'___'.$resid.'___'.$thisfn)
2575: eq $symb) {
2576: $okay=1;
2577: }
2578: }
2579: }
2580: untie(%bighash);
2581: }
2582: return $okay;
2583: }
2584:
2585: # --------------------------------------------------------------- Clean-up symb
2586:
2587: sub symbclean {
2588: my $symb=shift;
2589:
2590: # remove version from map
2591: $symb=~s/\.(\d+)\.(\w+)\_\_\_/\.$2\_\_\_/;
2592:
2593: # remove version from URL
2594: $symb=~s/\.(\d+)\.(\w+)$/\.$2/;
2595:
2596: return $symb;
2597: }
2598:
2599: # ------------------------------------------------------ Return symb list entry
2600:
2601: sub symbread {
2602: my $thisfn=shift;
2603: unless ($thisfn) {
2604: if ($ENV{'request.symb'}) { return &symbclean($ENV{'request.symb'}); }
2605: $thisfn=$ENV{'request.filename'};
2606: }
2607: $thisfn=declutter($thisfn);
2608: my %hash;
2609: my %bighash;
2610: my $syval='';
2611: if (($ENV{'request.course.fn'}) && ($thisfn)) {
2612: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
2613: &GDBM_READER,0640)) {
2614: $syval=$hash{$thisfn};
2615: untie(%hash);
2616: }
2617: # ---------------------------------------------------------- There was an entry
2618: if ($syval) {
2619: unless ($syval=~/\_\d+$/) {
2620: unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {
2621: &appenv('request.ambiguous' => $thisfn);
2622: return '';
2623: }
2624: $syval.=$1;
2625: }
2626: } else {
2627: # ------------------------------------------------------- Was not in symb table
2628: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
2629: &GDBM_READER,0640)) {
2630: # ---------------------------------------------- Get ID(s) for current resource
2631: my $ids=$bighash{'ids_/res/'.$thisfn};
2632: unless ($ids) {
2633: $ids=$bighash{'ids_/'.$thisfn};
2634: }
2635: if ($ids) {
2636: # ------------------------------------------------------------------- Has ID(s)
2637: my @possibilities=split(/\,/,$ids);
2638: if ($#possibilities==0) {
2639: # ----------------------------------------------- There is only one possibility
2640: my ($mapid,$resid)=split(/\./,$ids);
2641: $syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;
2642: } else {
2643: # ------------------------------------------ There is more than one possibility
2644: my $realpossible=0;
2645: foreach (@possibilities) {
2646: my $file=$bighash{'src_'.$_};
2647: if (&allowed('bre',$file)) {
2648: my ($mapid,$resid)=split(/\./,$_);
2649: if ($bighash{'map_type_'.$mapid} ne 'page') {
2650: $realpossible++;
2651: $syval=declutter($bighash{'map_id_'.$mapid}).
2652: '___'.$resid;
2653: }
2654: }
2655: }
2656: if ($realpossible!=1) { $syval=''; }
2657: }
2658: }
2659: untie(%bighash)
2660: }
2661: }
2662: if ($syval) {
2663: return &symbclean($syval.'___'.$thisfn);
2664: }
2665: }
2666: &appenv('request.ambiguous' => $thisfn);
2667: return '';
2668: }
2669:
2670: # ---------------------------------------------------------- Return random seed
2671:
2672: sub numval {
2673: my $txt=shift;
2674: $txt=~tr/A-J/0-9/;
2675: $txt=~tr/a-j/0-9/;
2676: $txt=~tr/K-T/0-9/;
2677: $txt=~tr/k-t/0-9/;
2678: $txt=~tr/U-Z/0-5/;
2679: $txt=~tr/u-z/0-5/;
2680: $txt=~s/\D//g;
2681: return int($txt);
2682: }
2683:
2684: sub rndseed {
2685: my ($symb,$courseid,$domain,$username)=@_;
2686: if (!$symb) {
2687: unless ($symb=&symbread()) { return time; }
2688: }
2689: if (!$courseid) { $courseid=$ENV{'request.course.id'};}
2690: if (!$domain) {$domain=$ENV{'user.domain'};}
2691: if (!$username) {$username=$ENV{'user.name'};}
2692: {
2693: use integer;
2694: my $symbchck=unpack("%32C*",$symb) << 27;
2695: my $symbseed=numval($symb) << 22;
2696: my $namechck=unpack("%32C*",$username) << 17;
2697: my $nameseed=numval($username) << 12;
2698: my $domainseed=unpack("%32C*",$domain) << 7;
2699: my $courseseed=unpack("%32C*",$courseid);
2700: my $num=$symbseed+$nameseed+$domainseed+$courseseed+$namechck+$symbchck;
2701: #uncommenting these lines can break things!
2702: #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
2703: #&Apache::lonxml::debug("rndseed :$num:$symb");
2704: return $num;
2705: }
2706: }
2707:
2708: sub ireceipt {
2709: my ($funame,$fudom,$fucourseid,$fusymb)=@_;
2710: my $cuname=unpack("%32C*",$funame);
2711: my $cudom=unpack("%32C*",$fudom);
2712: my $cucourseid=unpack("%32C*",$fucourseid);
2713: my $cusymb=unpack("%32C*",$fusymb);
2714: my $cunique=unpack("%32C*",$perlvar{'lonReceipt'});
2715: return unpack("%32C*",$perlvar{'lonHostID'}).'-'.
2716: ($cunique%$cuname+
2717: $cunique%$cudom+
2718: $cusymb%$cuname+
2719: $cusymb%$cudom+
2720: $cucourseid%$cuname+
2721: $cucourseid%$cudom);
2722: }
2723:
2724: sub receipt {
2725: return &ireceipt($ENV{'user.name'},$ENV{'user.domain'},
2726: $ENV{'request.course.id'},&symbread());
2727: }
2728:
2729: # ------------------------------------------------------------ Serves up a file
2730: # returns either the contents of the file or a -1
2731: sub getfile {
2732: my $file=shift;
2733: &repcopy($file);
2734: if (! -e $file ) { return -1; };
2735: my $fh=Apache::File->new($file);
2736: my $a='';
2737: while (<$fh>) { $a .=$_; }
2738: return $a
2739: }
2740:
2741: sub filelocation {
2742: my ($dir,$file) = @_;
2743: my $location;
2744: $file=~ s/^\s*(\S+)\s*$/$1/; ## strip off leading and trailing spaces
2745: if ($file=~m:^/~:) { # is a contruction space reference
2746: $location = $file;
2747: $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
2748: } else {
2749: $file=~s/^$perlvar{'lonDocRoot'}//;
2750: $file=~s:^/*res::;
2751: if ( !( $file =~ m:^/:) ) {
2752: $location = $dir. '/'.$file;
2753: } else {
2754: $location = '/home/httpd/html/res'.$file;
2755: }
2756: }
2757: $location=~s://+:/:g; # remove duplicate /
2758: while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
2759: return $location;
2760: }
2761:
2762: sub hreflocation {
2763: my ($dir,$file)=@_;
2764: unless (($file=~/^http:\/\//i) || ($file=~/^\//)) {
2765: my $finalpath=filelocation($dir,$file);
2766: $finalpath=~s/^\/home\/httpd\/html//;
2767: $finalpath=~s-/home/(\w+)/public_html/-/~$1/-;
2768: return $finalpath;
2769: } else {
2770: return $file;
2771: }
2772: }
2773:
2774: # ------------------------------------------------------------- Declutters URLs
2775:
2776: sub declutter {
2777: my $thisfn=shift;
2778: $thisfn=~s/^$perlvar{'lonDocRoot'}//;
2779: $thisfn=~s/^\///;
2780: $thisfn=~s/^res\///;
2781: return $thisfn;
2782: }
2783:
2784: # -------------------------------------------------------- Escape Special Chars
2785:
2786: sub escape {
2787: my $str=shift;
2788: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
2789: return $str;
2790: }
2791:
2792: # ----------------------------------------------------- Un-Escape Special Chars
2793:
2794: sub unescape {
2795: my $str=shift;
2796: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
2797: return $str;
2798: }
2799:
2800: # ================================================================ Main Program
2801:
2802: sub goodbye {
2803: &logthis("Starting Shut down");
2804: &flushcourselogs();
2805: &logthis("Shutting down");
2806: }
2807:
2808: BEGIN {
2809: # ----------------------------------- Read loncapa.conf and loncapa_apache.conf
2810: unless ($readit) {
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: my $config=Apache::File->new("/etc/httpd/conf/loncapa_apache.conf");
2824:
2825: while (my $configline=<$config>) {
2826: if ($configline =~ /^[^\#]*PerlSetVar/) {
2827: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
2828: chomp($varvalue);
2829: $perlvar{$varname}=$varvalue;
2830: }
2831: }
2832: }
2833:
2834: # ------------------------------------------------------------- Read hosts file
2835: {
2836: my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
2837:
2838: while (my $configline=<$config>) {
2839: chomp($configline);
2840: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
2841: $hostname{$id}=$name;
2842: $hostdom{$id}=$domain;
2843: $hostip{$id}=$ip;
2844: if ($role eq 'library') { $libserv{$id}=$name; }
2845: }
2846: }
2847:
2848: # ------------------------------------------------------ Read spare server file
2849: {
2850: my $config=Apache::File->new("$perlvar{'lonTabDir'}/spare.tab");
2851:
2852: while (my $configline=<$config>) {
2853: chomp($configline);
2854: if (($configline) && ($configline ne $perlvar{'lonHostID'})) {
2855: $spareid{$configline}=1;
2856: }
2857: }
2858: }
2859: # ------------------------------------------------------------ Read permissions
2860: {
2861: my $config=Apache::File->new("$perlvar{'lonTabDir'}/roles.tab");
2862:
2863: while (my $configline=<$config>) {
2864: chomp($configline);
2865: if ($configline) {
2866: my ($role,$perm)=split(/ /,$configline);
2867: if ($perm ne '') { $pr{$role}=$perm; }
2868: }
2869: }
2870: }
2871:
2872: # -------------------------------------------- Read plain texts for permissions
2873: {
2874: my $config=Apache::File->new("$perlvar{'lonTabDir'}/rolesplain.tab");
2875:
2876: while (my $configline=<$config>) {
2877: chomp($configline);
2878: if ($configline) {
2879: my ($short,$plain)=split(/:/,$configline);
2880: if ($plain ne '') { $prp{$short}=$plain; }
2881: }
2882: }
2883: }
2884:
2885: # ---------------------------------------------------------- Read package table
2886: {
2887: my $config=Apache::File->new("$perlvar{'lonTabDir'}/packages.tab");
2888:
2889: while (my $configline=<$config>) {
2890: chomp($configline);
2891: my ($short,$plain)=split(/:/,$configline);
2892: my ($pack,$name)=split(/\&/,$short);
2893: if ($plain ne '') {
2894: $packagetab{$pack.'&'.$name.'&name'}=$name;
2895: $packagetab{$short}=$plain;
2896: }
2897: }
2898: }
2899:
2900: %metacache=();
2901:
2902: $processmarker=$$.'_'.time.'_'.$perlvar{'lonHostID'};
2903: $dumpcount=0;
2904:
2905: &logtouch();
2906: &logthis('<font color=yellow>INFO: Read configuration</font>');
2907: $readit=1;
2908: }
2909: }
2910:
2911: 1;
2912: __END__
2913:
2914: =head1 NAME
2915:
2916: Apache::lonnet - TCP networking package
2917:
2918: =head1 SYNOPSIS
2919:
2920: Invoked by other LON-CAPA modules.
2921:
2922: &Apache::lonnet::SUBROUTINENAME(ARGUMENTS);
2923:
2924: =head1 INTRODUCTION
2925:
2926: This module provides subroutines which interact with the
2927: lonc/lond (TCP) network layer of LON-CAPA.
2928:
2929: This is part of the LearningOnline Network with CAPA project
2930: described at http://www.lon-capa.org.
2931:
2932: =head1 HANDLER SUBROUTINE
2933:
2934: There is no handler routine for this module.
2935:
2936: =head1 OTHER SUBROUTINES
2937:
2938: =over 4
2939:
2940: =item *
2941:
2942: logtouch() : make sure the logfile, lonnet.log, exists
2943:
2944: =item *
2945:
2946: logthis() : append message to lonnet.log
2947:
2948: =item *
2949:
2950: logperm() : append a permanent message to lonnet.perm.log
2951:
2952: =item *
2953:
2954: subreply() : non-critical communication, called by &reply
2955:
2956: =item *
2957:
2958: reply() : makes two attempts to pass message; logs refusals and rejections
2959:
2960: =item *
2961:
2962: reconlonc() : tries to reconnect lonc client processes.
2963:
2964: =item *
2965:
2966: critical() : passes a critical message to another server; if cannot get
2967: through then place message in connection buffer
2968:
2969: =item *
2970:
2971: appenv(%hash) : read in current user environment, append new environment
2972: values to make new user environment
2973:
2974: =item *
2975:
2976: delenv($varname) : read in current user environment, remove all values
2977: beginning with $varname, write new user environment (note: flock is used
2978: to prevent conflicting shared read/writes with file)
2979:
2980: =item *
2981:
2982: spareserver() : find server with least workload from spare.tab
2983:
2984: =item *
2985:
2986: queryauthenticate($uname,$udom) : try to determine user's current
2987: authentication scheme
2988:
2989: =item *
2990:
2991: authenticate($uname,$upass,$udom) : try to authenticate user from domain's lib
2992: servers (first use the current one)
2993:
2994: =item *
2995:
2996: homeserver($uname,$udom) : find the homebase for a user from domain's lib
2997: servers
2998:
2999: =item *
3000:
3001: idget($udom,@ids) : find the usernames behind a list of IDs (returns hash:
3002: id=>name,id=>name)
3003:
3004: =item *
3005:
3006: idrget($udom,@unames) : find the IDs behind a list of usernames (returns hash:
3007: name=>id,name=>id)
3008:
3009: =item *
3010:
3011: idput($udom,%ids) : store away a list of names and associated IDs
3012:
3013: =item *
3014:
3015: usection($domain,$user,$courseid) : output of section name/number or '' for
3016: "not in course" and '-1' for "no section"
3017:
3018: =item *
3019:
3020: userenvironment($domain,$user,$what) : puts out any environment parameter
3021: for a user
3022:
3023: =item *
3024:
3025: subscribe($fname) : subscribe to a resource, return URL if possible
3026:
3027: =item *
3028:
3029: repcopy($filename) : replicate file
3030:
3031: =item *
3032:
3033: ssi($url,%hash) : server side include, does a complete request cycle on url to
3034: localhost, posts hash
3035:
3036: =item *
3037:
3038: log($domain,$name,$home,$message) : write to permanent log for user; use
3039: critical subroutine
3040:
3041: =item *
3042:
3043: flushcourselogs() : flush (save) buffer logs and access logs
3044:
3045: =item *
3046:
3047: courselog($what) : save message for course in hash
3048:
3049: =item *
3050:
3051: courseacclog($what) : save message for course using &courselog(). Perform
3052: special processing for specific resource types (problems, exams, quizzes, etc).
3053:
3054: =item *
3055:
3056: countacc($url) : count the number of accesses to a given URL
3057:
3058: =item *
3059:
3060: sub checkout($symb,$tuname,$tudom,$tcrsid) : check out an item
3061:
3062: =item *
3063:
3064: sub checkin($token) : check in an item
3065:
3066: =item *
3067:
3068: sub expirespread($uname,$udom,$stype,$usymb) : set expire date for spreadsheet
3069:
3070: =item *
3071:
3072: devalidate($symb) : devalidate spreadsheets
3073:
3074: =item *
3075:
3076: hash2str(%hash) : convert a hash into a string complete with escaping and '='
3077: and '&' separators, supports elements that are arrayrefs and hashrefs
3078:
3079: =item *
3080:
3081: hashref2str($hashref) : convert a hashref into a string complete with
3082: escaping and '=' and '&' separators, supports elements that are
3083: arrayrefs and hashrefs
3084:
3085: =item *
3086:
3087: arrayref2str($arrayref) : convert an arrayref into a string complete
3088: with escaping and '&' separators, supports elements that are arrayrefs
3089: and hashrefs
3090:
3091: =item *
3092:
3093: str2hash($string) : convert string to hash using unescaping and
3094: splitting on '=' and '&', supports elements that are arrayrefs and
3095: hashrefs
3096:
3097: =item *
3098:
3099: str2array($string) : convert string to hash using unescaping and
3100: splitting on '&', supports elements that are arrayrefs and hashrefs
3101:
3102: =item *
3103:
3104: tmpreset($symb,$namespace,$domain,$stuname) : temporary storage
3105:
3106: =item *
3107:
3108: tmprestore($symb,$namespace,$domain,$stuname) : temporary restore
3109:
3110: =item *
3111:
3112: store($storehash,$symb,$namespace,$domain,$stuname) : stores hash permanently
3113: for this url; hashref needs to be given and should be a \%hashname; the
3114: remaining args aren't required and if they aren't passed or are '' they will
3115: be derived from the ENV
3116:
3117: =item *
3118:
3119: cstore($storehash,$symb,$namespace,$domain,$stuname) : same as store but
3120: uses critical subroutine
3121:
3122: =item *
3123:
3124: restore($symb,$namespace,$domain,$stuname) : returns hash for this symb;
3125: all args are optional
3126:
3127: =item *
3128:
3129: coursedescription($courseid) : course description
3130:
3131: =item *
3132:
3133: rolesinit($domain,$username,$authhost) : get user privileges
3134:
3135: =item *
3136:
3137: get($namespace,$storearr,$udomain,$uname) : returns hash with keys from array
3138: reference filled in from namesp ($udomain and $uname are optional)
3139:
3140: =item *
3141:
3142: del($namespace,$storearr,$udomain,$uname) : deletes keys out of array from
3143: namesp ($udomain and $uname are optional)
3144:
3145: =item *
3146:
3147: dump($namespace,$udomain,$uname,$regexp) :
3148: dumps the complete (or key matching regexp) namespace into a hash
3149: ($udomain, $uname and $regexp are optional)
3150:
3151: =item *
3152:
3153: put($namespace,$storehash,$udomain,$uname) : stores hash in namesp
3154: ($udomain and $uname are optional)
3155:
3156: =item *
3157:
3158: cput($namespace,$storehash,$udomain,$uname) : critical put
3159: ($udomain and $uname are optional)
3160:
3161: =item *
3162:
3163: eget($namespace,$storearr,$udomain,$uname) : returns hash with keys from array
3164: reference filled in from namesp (encrypts the return communication)
3165: ($udomain and $uname are optional)
3166:
3167: =item *
3168:
3169: allowed($priv,$uri) : check for a user privilege; returns codes for allowed
3170: actions
3171: F: full access
3172: U,I,K: authentication modes (cxx only)
3173: '': forbidden
3174: 1: user needs to choose course
3175: 2: browse allowed
3176:
3177: =item *
3178:
3179: definerole($rolename,$sysrole,$domrole,$courole) : define role; define a custom
3180: role rolename set privileges in format of lonTabs/roles.tab for system, domain,
3181: and course level
3182:
3183: =item *
3184:
3185: metadata_query($query,$custom,$customshow) : make a metadata query against the
3186: network of library servers; returns file handle of where SQL and regex results
3187: will be stored for query
3188:
3189: =item *
3190:
3191: plaintext($short) : return value in %prp hash (rolesplain.tab); plain text
3192: explanation of a user role term
3193:
3194: =item *
3195:
3196: assignrole($udom,$uname,$url,$role,$end,$start) : assign role; give a role to a
3197: user for the level given by URL. Optional start and end dates (leave empty
3198: string or zero for "no date")
3199:
3200: =item *
3201:
3202: modifyuserauth($udom,$uname,$umode,$upass) : modify user authentication
3203:
3204: =item *
3205:
3206: modifyuser($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene) :
3207: modify user
3208:
3209: =item *
3210:
3211: modifystudent($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,
3212: $end,$start) : modify student
3213:
3214: =item *
3215:
3216: writecoursepref($courseid,%prefs) : write preferences for a course
3217:
3218: =item *
3219:
3220: createcourse($udom,$description,$url) : make/modify course
3221:
3222: =item *
3223:
3224: assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start) : assign
3225: custom role; give a custom role to a user for the level given by URL. Specify
3226: name and domain of role author, and role name
3227:
3228: =item *
3229:
3230: revokerole($udom,$uname,$url,$role) : revoke a role for url
3231:
3232: =item *
3233:
3234: revokecustomrole($udom,$uname,$url,$role) : revoke a custom role
3235:
3236: =item *
3237:
3238: dirlist($uri) : return directory list based on URI
3239:
3240: =item *
3241:
3242: directcondval($number) : get current value of a condition; reads from a state
3243: string
3244:
3245: =item *
3246:
3247: condval($condidx) : value of condition index based on state
3248:
3249: =item *
3250:
3251: EXT($varname,$symbparm) : value of a variable
3252:
3253: =item *
3254:
3255: metadata($uri,$what,$liburi,$prefix,$depthcount) : get metadata; returns the
3256: metadata entry for a file; entry='keys', returns a comma separated list of keys
3257:
3258: =item *
3259:
3260: symblist($mapname,%newhash) : update symbolic storage links
3261:
3262: =item *
3263:
3264: symbread($filename) : return symbolic list entry (filename argument optional);
3265: returns the data handle
3266:
3267: =item *
3268:
3269: numval($salt) : return random seed value (addend for rndseed)
3270:
3271: =item *
3272:
3273: rndseed($symb,$courseid,$domain,$username) : create a random sum; returns
3274: a random seed, all arguments are optional, if they aren't sent it uses the
3275: environment to derive them. Note: if symb isn't sent and it can't get one
3276: from &symbread it will use the current time as its return value
3277:
3278: =item *
3279:
3280: ireceipt($funame,$fudom,$fucourseid,$fusymb) : return unique,
3281: unfakeable, receipt
3282:
3283: =item *
3284:
3285: receipt() : API to ireceipt working off of ENV values; given out to users
3286:
3287: =item *
3288:
3289: getfile($file) : serves up a file, returns the contents of a file or -1;
3290: replicates and subscribes to the file
3291:
3292: =item *
3293:
3294: filelocation($dir,$file) : returns file system location of a file based on URI;
3295: meant to be "fairly clean" absolute reference, $dir is a directory that relative $file lookups are to looked in ($dir of /a/dir and a file of ../bob will become /a/bob)
3296:
3297: =item *
3298:
3299: hreflocation($dir,$file) : returns file system location or a URL; same as
3300: filelocation except for hrefs
3301:
3302: =item *
3303:
3304: declutter() : declutters URLs (remove docroot, beginning slashes, 'res' etc)
3305:
3306: =item *
3307:
3308: escape() : unpack non-word characters into CGI-compatible hex codes
3309:
3310: =item *
3311:
3312: unescape() : pack CGI-compatible hex codes into actual non-word ASCII character
3313:
3314: =item *
3315:
3316: goodbye() : flush course logs and log shutting down; it is called in srm.conf
3317: as a PerlChildExitHandler
3318:
3319: =back
3320:
3321: =cut
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