1: # The LearningOnline Network
2: # TCP networking package
3: #
4: # $Id: lonnet.pm,v 1.349 2003/03/24 18:18:09 www Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # 6/1/99,6/2,6/10,6/11,6/12,6/14,6/26,6/28,6/29,6/30,
29: # 7/1,7/2,7/9,7/10,7/12,7/14,7/15,7/19,
30: # 11/8,11/16,11/18,11/22,11/23,12/22,
31: # 01/06,01/13,02/24,02/28,02/29,
32: # 03/01,03/02,03/06,03/07,03/13,
33: # 04/05,05/29,05/31,06/01,
34: # 06/05,06/26 Gerd Kortemeyer
35: # 06/26 Ben Tyszka
36: # 06/30,07/15,07/17,07/18,07/20,07/21,07/22,07/25 Gerd Kortemeyer
37: # 08/14 Ben Tyszka
38: # 08/22,08/28,08/31,09/01,09/02,09/04,09/05,09/25,09/28,09/30 Gerd Kortemeyer
39: # 10/04 Gerd Kortemeyer
40: # 10/04 Guy Albertelli
41: # 10/06,10/09,10/10,10/11,10/14,10/20,10/23,10/25,10/26,10/27,10/28,10/29,
42: # 10/30,10/31,
43: # 11/2,11/14,11/15,11/16,11/20,11/21,11/22,11/25,11/27,
44: # 12/02,12/12,12/13,12/14,12/28,12/29 Gerd Kortemeyer
45: # 05/01/01 Guy Albertelli
46: # 05/01,06/01,09/01 Gerd Kortemeyer
47: # 09/01 Guy Albertelli
48: # 09/01,10/01,11/01 Gerd Kortemeyer
49: # YEAR=2001
50: # 3/2 Gerd Kortemeyer
51: # 3/19,3/20 Gerd Kortemeyer
52: # 5/26,5/28 Gerd Kortemeyer
53: # 5/30 H. K. Ng
54: # 6/1 Gerd Kortemeyer
55: # July Guy Albertelli
56: # 8/4,8/7,8/8,8/9,8/11,8/16,8/17,8/18,8/20,8/23,9/20,9/21,9/26,
57: # 10/2 Gerd Kortemeyer
58: # 11/17,11/20,11/22,11/29 Gerd Kortemeyer
59: # 12/5 Matthew Hall
60: # 12/5 Guy Albertelli
61: # 12/6,12/7,12/12 Gerd Kortemeyer
62: # 12/21,12/22,12/27,12/28 Gerd Kortemeyer
63: # YEAR=2002
64: # 1/4,2/4,2/7 Gerd Kortemeyer
65: #
66: ###
67:
68: package Apache::lonnet;
69:
70: use strict;
71: use Apache::File;
72: use LWP::UserAgent();
73: use HTTP::Headers;
74: use vars
75: qw(%perlvar %hostname %homecache %badServerCache %hostip %iphost %spareid %hostdom
76: %libserv %pr %prp %metacache %packagetab %titlecache
77: %courselogs %accesshash %userrolehash $processmarker $dumpcount
78: %coursedombuf %coursehombuf %courseresdatacache
79: %domaindescription %domain_auth_def %domain_auth_arg_def $tmpdir);
80: use IO::Socket;
81: use GDBM_File;
82: use Apache::Constants qw(:common :http);
83: use HTML::LCParser;
84: use Fcntl qw(:flock);
85: use Apache::loncoursedata;
86:
87: my $readit;
88:
89: # --------------------------------------------------------------------- Logging
90:
91: sub logtouch {
92: my $execdir=$perlvar{'lonDaemons'};
93: unless (-e "$execdir/logs/lonnet.log") {
94: my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
95: close $fh;
96: }
97: my ($wwwuid,$wwwgid)=(getpwnam('www'))[2,3];
98: chown($wwwuid,$wwwgid,$execdir.'/logs/lonnet.log');
99: }
100:
101: sub logthis {
102: my $message=shift;
103: my $execdir=$perlvar{'lonDaemons'};
104: my $now=time;
105: my $local=localtime($now);
106: my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
107: print $fh "$local ($$): $message\n";
108: return 1;
109: }
110:
111: sub logperm {
112: my $message=shift;
113: my $execdir=$perlvar{'lonDaemons'};
114: my $now=time;
115: my $local=localtime($now);
116: my $fh=Apache::File->new(">>$execdir/logs/lonnet.perm.log");
117: print $fh "$now:$message:$local\n";
118: return 1;
119: }
120:
121: # -------------------------------------------------- Non-critical communication
122: sub subreply {
123: my ($cmd,$server)=@_;
124: my $peerfile="$perlvar{'lonSockDir'}/$server";
125: my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
126: Type => SOCK_STREAM,
127: Timeout => 10)
128: or return "con_lost";
129: print $client "$cmd\n";
130: my $answer=<$client>;
131: if (!$answer) { $answer="con_lost"; }
132: chomp($answer);
133: return $answer;
134: }
135:
136: sub reply {
137: my ($cmd,$server)=@_;
138: unless (defined($hostname{$server})) { return 'no_such_host'; }
139: my $answer=subreply($cmd,$server);
140: if ($answer eq 'con_lost') {
141: #sleep 5;
142: #$answer=subreply($cmd,$server);
143: #if ($answer eq 'con_lost') {
144: # &logthis("Second attempt con_lost on $server");
145: # my $peerfile="$perlvar{'lonSockDir'}/$server";
146: # my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
147: # Type => SOCK_STREAM,
148: # Timeout => 10)
149: # or return "con_lost";
150: # &logthis("Killing socket");
151: # print $client "close_connection_exit\n";
152: #sleep 5;
153: # $answer=subreply($cmd,$server);
154: #}
155: }
156: if (($answer=~/^refused/) || ($answer=~/^rejected/)) {
157: &logthis("<font color=blue>WARNING:".
158: " $cmd to $server returned $answer</font>");
159: }
160: return $answer;
161: }
162:
163: # ----------------------------------------------------------- Send USR1 to lonc
164:
165: sub reconlonc {
166: my $peerfile=shift;
167: &logthis("Trying to reconnect for $peerfile");
168: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
169: if (my $fh=Apache::File->new("$loncfile")) {
170: my $loncpid=<$fh>;
171: chomp($loncpid);
172: if (kill 0 => $loncpid) {
173: &logthis("lonc at pid $loncpid responding, sending USR1");
174: kill USR1 => $loncpid;
175: sleep 1;
176: if (-e "$peerfile") { return; }
177: &logthis("$peerfile still not there, give it another try");
178: sleep 5;
179: if (-e "$peerfile") { return; }
180: &logthis(
181: "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
182: } else {
183: &logthis(
184: "<font color=blue>WARNING:".
185: " lonc at pid $loncpid not responding, giving up</font>");
186: }
187: } else {
188: &logthis('<font color=blue>WARNING: lonc not running, giving up</font>');
189: }
190: }
191:
192: # ------------------------------------------------------ Critical communication
193:
194: sub critical {
195: my ($cmd,$server)=@_;
196: unless ($hostname{$server}) {
197: &logthis("<font color=blue>WARNING:".
198: " Critical message to unknown server ($server)</font>");
199: return 'no_such_host';
200: }
201: my $answer=reply($cmd,$server);
202: if ($answer eq 'con_lost') {
203: my $pingreply=reply('ping',$server);
204: &reconlonc("$perlvar{'lonSockDir'}/$server");
205: my $pongreply=reply('pong',$server);
206: &logthis("Ping/Pong for $server: $pingreply/$pongreply");
207: $answer=reply($cmd,$server);
208: if ($answer eq 'con_lost') {
209: my $now=time;
210: my $middlename=$cmd;
211: $middlename=substr($middlename,0,16);
212: $middlename=~s/\W//g;
213: my $dfilename=
214: "$perlvar{'lonSockDir'}/delayed/$now.$dumpcount.$$.$middlename.$server";
215: $dumpcount++;
216: {
217: my $dfh;
218: if ($dfh=Apache::File->new(">$dfilename")) {
219: print $dfh "$cmd\n";
220: }
221: }
222: sleep 2;
223: my $wcmd='';
224: {
225: my $dfh;
226: if ($dfh=Apache::File->new("$dfilename")) {
227: $wcmd=<$dfh>;
228: }
229: }
230: chomp($wcmd);
231: if ($wcmd eq $cmd) {
232: &logthis("<font color=blue>WARNING: ".
233: "Connection buffer $dfilename: $cmd</font>");
234: &logperm("D:$server:$cmd");
235: return 'con_delayed';
236: } else {
237: &logthis("<font color=red>CRITICAL:"
238: ." Critical connection failed: $server $cmd</font>");
239: &logperm("F:$server:$cmd");
240: return 'con_failed';
241: }
242: }
243: }
244: return $answer;
245: }
246:
247: # ---------------------------------------------------------- Append Environment
248:
249: sub appenv {
250: my %newenv=@_;
251: foreach (keys %newenv) {
252: if (($newenv{$_}=~/^user\.role/) || ($newenv{$_}=~/^user\.priv/)) {
253: &logthis("<font color=blue>WARNING: ".
254: "Attempt to modify environment ".$_." to ".$newenv{$_}
255: .'</font>');
256: delete($newenv{$_});
257: } else {
258: $ENV{$_}=$newenv{$_};
259: }
260: }
261:
262: my $lockfh;
263: unless ($lockfh=Apache::File->new("$ENV{'user.environment'}")) {
264: return 'error: '.$!;
265: }
266: unless (flock($lockfh,LOCK_EX)) {
267: &logthis("<font color=blue>WARNING: ".
268: 'Could not obtain exclusive lock in appenv: '.$!);
269: $lockfh->close();
270: return 'error: '.$!;
271: }
272:
273: my @oldenv;
274: {
275: my $fh;
276: unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
277: return 'error: '.$!;
278: }
279: @oldenv=<$fh>;
280: $fh->close();
281: }
282: for (my $i=0; $i<=$#oldenv; $i++) {
283: chomp($oldenv[$i]);
284: if ($oldenv[$i] ne '') {
285: my ($name,$value)=split(/=/,$oldenv[$i]);
286: unless (defined($newenv{$name})) {
287: $newenv{$name}=$value;
288: }
289: }
290: }
291: {
292: my $fh;
293: unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
294: return 'error';
295: }
296: my $newname;
297: foreach $newname (keys %newenv) {
298: print $fh "$newname=$newenv{$newname}\n";
299: }
300: $fh->close();
301: }
302:
303: $lockfh->close();
304: return 'ok';
305: }
306: # ----------------------------------------------------- Delete from Environment
307:
308: sub delenv {
309: my $delthis=shift;
310: my %newenv=();
311: if (($delthis=~/user\.role/) || ($delthis=~/user\.priv/)) {
312: &logthis("<font color=blue>WARNING: ".
313: "Attempt to delete from environment ".$delthis);
314: return 'error';
315: }
316: my @oldenv;
317: {
318: my $fh;
319: unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
320: return 'error';
321: }
322: unless (flock($fh,LOCK_SH)) {
323: &logthis("<font color=blue>WARNING: ".
324: 'Could not obtain shared lock in delenv: '.$!);
325: $fh->close();
326: return 'error: '.$!;
327: }
328: @oldenv=<$fh>;
329: $fh->close();
330: }
331: {
332: my $fh;
333: unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
334: return 'error';
335: }
336: unless (flock($fh,LOCK_EX)) {
337: &logthis("<font color=blue>WARNING: ".
338: 'Could not obtain exclusive lock in delenv: '.$!);
339: $fh->close();
340: return 'error: '.$!;
341: }
342: foreach (@oldenv) {
343: unless ($_=~/^$delthis/) { print $fh $_; }
344: }
345: $fh->close();
346: }
347: return 'ok';
348: }
349:
350: # ------------------------------------------ Fight off request when overloaded
351:
352: sub overloaderror {
353: my ($r,$checkserver)=@_;
354: unless ($checkserver) { $checkserver=$perlvar{'lonHostID'}; }
355: my $loadavg;
356: if ($checkserver eq $perlvar{'lonHostID'}) {
357: my $loadfile=Apache::File->new('/proc/loadavg');
358: $loadavg=<$loadfile>;
359: $loadavg =~ s/\s.*//g;
360: $loadavg = 100*$loadavg/$perlvar{'lonLoadLim'};
361: } else {
362: $loadavg=&reply('load',$checkserver);
363: }
364: my $overload=$loadavg-100;
365: if ($overload>0) {
366: $r->err_headers_out->{'Retry-After'}=$overload;
367: $r->log_error('Overload of '.$overload.' on '.$checkserver);
368: return 413;
369: }
370: return '';
371: }
372:
373: # ------------------------------ Find server with least workload from spare.tab
374:
375: sub spareserver {
376: my $loadpercent = shift;
377: my $tryserver;
378: my $spareserver='';
379: my $lowestserver=$loadpercent;
380: foreach $tryserver (keys %spareid) {
381: my $answer=reply('load',$tryserver);
382: if (($answer =~ /\d/) && ($answer<$lowestserver)) {
383: $spareserver="http://$hostname{$tryserver}";
384: $lowestserver=$answer;
385: }
386: }
387: return $spareserver;
388: }
389:
390: # --------------------------------------------- Try to change a user's password
391:
392: sub changepass {
393: my ($uname,$udom,$currentpass,$newpass,$server)=@_;
394: $currentpass = &escape($currentpass);
395: $newpass = &escape($newpass);
396: my $answer = reply("encrypt:passwd:$udom:$uname:$currentpass:$newpass",
397: $server);
398: if (! $answer) {
399: &logthis("No reply on password change request to $server ".
400: "by $uname in domain $udom.");
401: } elsif ($answer =~ "^ok") {
402: &logthis("$uname in $udom successfully changed their password ".
403: "on $server.");
404: } elsif ($answer =~ "^pwchange_failure") {
405: &logthis("$uname in $udom was unable to change their password ".
406: "on $server. The action was blocked by either lcpasswd ".
407: "or pwchange");
408: } elsif ($answer =~ "^non_authorized") {
409: &logthis("$uname in $udom did not get their password correct when ".
410: "attempting to change it on $server.");
411: } elsif ($answer =~ "^auth_mode_error") {
412: &logthis("$uname in $udom attempted to change their password despite ".
413: "not being locally or internally authenticated on $server.");
414: } elsif ($answer =~ "^unknown_user") {
415: &logthis("$uname in $udom attempted to change their password ".
416: "on $server but were unable to because $server is not ".
417: "their home server.");
418: } elsif ($answer =~ "^refused") {
419: &logthis("$server refused to change $uname in $udom password because ".
420: "it was sent an unencrypted request to change the password.");
421: }
422: return $answer;
423: }
424:
425: # ----------------------- Try to determine user's current authentication scheme
426:
427: sub queryauthenticate {
428: my ($uname,$udom)=@_;
429: if (($perlvar{'lonRole'} eq 'library') &&
430: ($udom eq $perlvar{'lonDefDomain'})) {
431: my $answer=reply("encrypt:currentauth:$udom:$uname",
432: $perlvar{'lonHostID'});
433: unless ($answer eq 'unknown_user' or $answer eq 'refused') {
434: if (length($answer)) {
435: return $answer;
436: }
437: else {
438: &logthis("User $uname at $udom lacks an authentication mechanism");
439: return 'no_host';
440: }
441: }
442: }
443:
444: my $tryserver;
445: foreach $tryserver (keys %libserv) {
446: if ($hostdom{$tryserver} eq $udom) {
447: my $answer=reply("encrypt:currentauth:$udom:$uname",$tryserver);
448: unless ($answer eq 'unknown_user' or $answer eq 'refused') {
449: if (length($answer)) {
450: return $answer;
451: }
452: else {
453: &logthis("User $uname at $udom lacks an authentication mechanism");
454: return 'no_host';
455: }
456: }
457: }
458: }
459: &logthis("User $uname at $udom lacks an authentication mechanism");
460: return 'no_host';
461: }
462:
463: # --------- Try to authenticate user from domain's lib servers (first this one)
464:
465: sub authenticate {
466: my ($uname,$upass,$udom)=@_;
467: $upass=escape($upass);
468: $uname=~s/\W//g;
469: if (($perlvar{'lonRole'} eq 'library') &&
470: ($udom eq $perlvar{'lonDefDomain'})) {
471: my $answer=reply("encrypt:auth:$udom:$uname:$upass",$perlvar{'lonHostID'});
472: if ($answer =~ /authorized/) {
473: if ($answer eq 'authorized') {
474: &logthis("User $uname at $udom authorized by local server");
475: return $perlvar{'lonHostID'};
476: }
477: if ($answer eq 'non_authorized') {
478: &logthis("User $uname at $udom rejected by local server");
479: return 'no_host';
480: }
481: }
482: }
483:
484: my $tryserver;
485: foreach $tryserver (keys %libserv) {
486: if ($hostdom{$tryserver} eq $udom) {
487: my $answer=reply("encrypt:auth:$udom:$uname:$upass",$tryserver);
488: if ($answer =~ /authorized/) {
489: if ($answer eq 'authorized') {
490: &logthis("User $uname at $udom authorized by $tryserver");
491: return $tryserver;
492: }
493: if ($answer eq 'non_authorized') {
494: &logthis("User $uname at $udom rejected by $tryserver");
495: return 'no_host';
496: }
497: }
498: }
499: }
500: &logthis("User $uname at $udom could not be authenticated");
501: return 'no_host';
502: }
503:
504: # ---------------------- Find the homebase for a user from domain's lib servers
505:
506: sub homeserver {
507: my ($uname,$udom,$ignoreBadCache)=@_;
508: my $index="$uname:$udom";
509: if ($homecache{$index}) {
510: return "$homecache{$index}";
511: }
512: my $tryserver;
513: foreach $tryserver (keys %libserv) {
514: next if ($ignoreBadCache ne 'true' &&
515: exists($badServerCache{$tryserver}));
516: if ($hostdom{$tryserver} eq $udom) {
517: my $answer=reply("home:$udom:$uname",$tryserver);
518: if ($answer eq 'found') {
519: $homecache{$index}=$tryserver;
520: return $tryserver;
521: } elsif ($answer eq 'no_host') {
522: $badServerCache{$tryserver}=1;
523: }
524: }
525: }
526: return 'no_host';
527: }
528:
529: # ------------------------------------- Find the usernames behind a list of IDs
530:
531: sub idget {
532: my ($udom,@ids)=@_;
533: my %returnhash=();
534:
535: my $tryserver;
536: foreach $tryserver (keys %libserv) {
537: if ($hostdom{$tryserver} eq $udom) {
538: my $idlist=join('&',@ids);
539: $idlist=~tr/A-Z/a-z/;
540: my $reply=&reply("idget:$udom:".$idlist,$tryserver);
541: my @answer=();
542: if (($reply ne 'con_lost') && ($reply!~/^error\:/)) {
543: @answer=split(/\&/,$reply);
544: } ;
545: my $i;
546: for ($i=0;$i<=$#ids;$i++) {
547: if ($answer[$i]) {
548: $returnhash{$ids[$i]}=$answer[$i];
549: }
550: }
551: }
552: }
553: return %returnhash;
554: }
555:
556: # ------------------------------------- Find the IDs behind a list of usernames
557:
558: sub idrget {
559: my ($udom,@unames)=@_;
560: my %returnhash=();
561: foreach (@unames) {
562: $returnhash{$_}=(&userenvironment($udom,$_,'id'))[1];
563: }
564: return %returnhash;
565: }
566:
567: # ------------------------------- Store away a list of names and associated IDs
568:
569: sub idput {
570: my ($udom,%ids)=@_;
571: my %servers=();
572: foreach (keys %ids) {
573: my $uhom=&homeserver($_,$udom);
574: if ($uhom ne 'no_host') {
575: my $id=&escape($ids{$_});
576: $id=~tr/A-Z/a-z/;
577: my $unam=&escape($_);
578: if ($servers{$uhom}) {
579: $servers{$uhom}.='&'.$id.'='.$unam;
580: } else {
581: $servers{$uhom}=$id.'='.$unam;
582: }
583: &critical('put:'.$udom.':'.$unam.':environment:id='.$id,$uhom);
584: }
585: }
586: foreach (keys %servers) {
587: &critical('idput:'.$udom.':'.$servers{$_},$_);
588: }
589: }
590:
591: # --------------------------------------------------- Assign a key to a student
592:
593: sub assign_access_key {
594: my ($ckey,$cdom,$cnum,$udom,$uname)=@_;
595: $cdom=
596: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'} unless (defined($cdom));
597: $cnum=
598: $ENV{'course.'.$ENV{'request.course.id'}.'.num'} unless (defined($cnum));
599: $udom=$ENV{'user.name'} unless (defined($udom));
600: $uname=$ENV{'user.domain'} unless (defined($uname));
601: my %existing=&get('accesskeys',[$ckey],$cdom,$cnum);
602: if (($existing{$ckey}=~/^\d+$/) || # has time - new key
603: ($existing{$ckey} eq $uname.':'.$udom)) { # this should not happen,
604: # unless something went wrong
605: # the first time around
606: # ready to assign
607: } elsif (!$existing{$ckey}) {
608: if (&put('accesskey',{$ckey=>$uname.':'.$udom},$cdom,$cnum) eq 'ok') {
609: # key now belongs to user
610: my $envkey='key.'.$cdom.'_'.$cnum;
611: if (&put('environment',{$envkey => $ckey}) eq 'ok') {
612: &appenv('environment.'.$envkey => $ckey);
613: return 'ok';
614: } else {
615: return
616: 'error: Count not permanently assign key, will need to be re-entered later.';
617: }
618: } else {
619: return 'error: Could not assign key, try again later.';
620: }
621: # the key does not exist
622: return 'error: The key does not exist';
623: } else {
624: # the key is somebody else's
625: return 'error: The key is already in use';
626: }
627: }
628:
629: # ------------------------------------------------------ Generate a set of keys
630:
631: sub generate_access_keys {
632: my ($number,$cdom,$cnum)=@_;
633: $cdom=
634: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'} unless (defined($cdom));
635: $cnum=
636: $ENV{'course.'.$ENV{'request.course.id'}.'.num'} unless (defined($cnum));
637: unless (&allowed('ccc',$cdom)) { return 0; }
638: unless (($cdom) && ($cnum)) { return 0; }
639: if ($number>10000) { return 0; }
640: sleep(2); # make sure don't get same seed twice
641: srand(time()^($$+($$<<15))); # from "Programming Perl"
642: my $total=0;
643: for (my $i=1;$i<=$number;$i++) {
644: my $newkey=sprintf("%lx",int(100000*rand)).'-'.
645: sprintf("%lx",int(100000*rand)).'-'.
646: sprintf("%lx",int(100000*rand));
647: $newkey=~s/1/g/g; # folks mix up 1 and l
648: $newkey=~s/0/h/g; # and also 0 and O
649: my %existing=&get('accesskeys',[$newkey],$cdom,$cnum);
650: if ($existing{$newkey}) {
651: $i--;
652: } else {
653: if (&put('accesskeys',{ $newkey => time() },$cdom,$cnum) eq 'ok') {
654: $total++;
655: }
656: }
657: }
658: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},
659: 'Generated '.$total.' keys for '.$cnum.' at '.$cdom);
660: return $total;
661: }
662:
663: # ------------------------------------------------------- Validate an accesskey
664:
665: sub validate_access_key {
666: my ($ckey,$cdom,$cnum,$udom,$uname)=@_;
667: $cdom=
668: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'} unless (defined($cdom));
669: $cnum=
670: $ENV{'course.'.$ENV{'request.course.id'}.'.num'} unless (defined($cnum));
671: $udom=$ENV{'user.name'} unless (defined($udom));
672: $uname=$ENV{'user.domain'} unless (defined($uname));
673: my %existing=&get('accesskeys',[$ckey],$cdom,$cnum);
674: return ($existing{$ckey} eq $uname.':'.$udom);
675: }
676:
677: # ------------------------------------- Find the section of student in a course
678:
679: sub getsection {
680: my ($udom,$unam,$courseid)=@_;
681: $courseid=~s/\_/\//g;
682: $courseid=~s/^(\w)/\/$1/;
683: my %Pending;
684: my %Expired;
685: #
686: # Each role can either have not started yet (pending), be active,
687: # or have expired.
688: #
689: # If there is an active role, we are done.
690: #
691: # If there is more than one role which has not started yet,
692: # choose the one which will start sooner
693: # If there is one role which has not started yet, return it.
694: #
695: # If there is more than one expired role, choose the one which ended last.
696: # If there is a role which has expired, return it.
697: #
698: foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
699: &homeserver($unam,$udom)))) {
700: my ($key,$value)=split(/\=/,$_);
701: $key=&unescape($key);
702: next if ($key !~/^$courseid(?:\/)*(\w+)*\_st$/);
703: my $section=$1;
704: if ($key eq $courseid.'_st') { $section=''; }
705: my ($dummy,$end,$start)=split(/\_/,&unescape($value));
706: my $now=time;
707: if (defined($end) && ($now > $end)) {
708: $Expired{$end}=$section;
709: next;
710: }
711: if (defined($start) && ($now < $start)) {
712: $Pending{$start}=$section;
713: next;
714: }
715: return $section;
716: }
717: #
718: # Presumedly there will be few matching roles from the above
719: # loop and the sorting time will be negligible.
720: if (scalar(keys(%Pending))) {
721: my ($time) = sort {$a <=> $b} keys(%Pending);
722: return $Pending{$time};
723: }
724: if (scalar(keys(%Expired))) {
725: my @sorted = sort {$a <=> $b} keys(%Expired);
726: my $time = pop(@sorted);
727: return $Expired{$time};
728: }
729: return '-1';
730: }
731:
732: sub usection {
733: my ($udom,$unam,$courseid)=@_;
734: $courseid=~s/\_/\//g;
735: $courseid=~s/^(\w)/\/$1/;
736: foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
737: &homeserver($unam,$udom)))) {
738: my ($key,$value)=split(/\=/,$_);
739: $key=&unescape($key);
740: if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
741: my $section=$1;
742: if ($key eq $courseid.'_st') { $section=''; }
743: my ($dummy,$end,$start)=split(/\_/,&unescape($value));
744: my $now=time;
745: my $notactive=0;
746: if ($start) {
747: if ($now<$start) { $notactive=1; }
748: }
749: if ($end) {
750: if ($now>$end) { $notactive=1; }
751: }
752: unless ($notactive) { return $section; }
753: }
754: }
755: return '-1';
756: }
757:
758: # ------------------------------------- Read an entry from a user's environment
759:
760: sub userenvironment {
761: my ($udom,$unam,@what)=@_;
762: my %returnhash=();
763: my @answer=split(/\&/,
764: &reply('get:'.$udom.':'.$unam.':environment:'.join('&',@what),
765: &homeserver($unam,$udom)));
766: my $i;
767: for ($i=0;$i<=$#what;$i++) {
768: $returnhash{$what[$i]}=&unescape($answer[$i]);
769: }
770: return %returnhash;
771: }
772:
773: # -------------------------------------------------------------------- New chat
774:
775: sub chatsend {
776: my ($newentry,$anon)=@_;
777: my $cnum=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
778: my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
779: my $chome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
780: &reply('chatsend:'.$cdom.':'.$cnum.':'.
781: &escape($ENV{'user.domain'}.':'.$ENV{'user.name'}.':'.$anon.':'.
782: &escape($newentry)),$chome);
783: }
784:
785: # ------------------------------------------ Find current version of a resource
786:
787: sub getversion {
788: my $fname=&clutter(shift);
789: unless ($fname=~/^\/res\//) { return -1; }
790: return ¤tversion(&filelocation('',$fname));
791: }
792:
793: sub currentversion {
794: my $fname=shift;
795: my $author=$fname;
796: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
797: my ($udom,$uname)=split(/\//,$author);
798: my $home=homeserver($uname,$udom);
799: if ($home eq 'no_host') {
800: return -1;
801: }
802: my $answer=reply("currentversion:$fname",$home);
803: if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
804: return -1;
805: }
806: return $answer;
807: }
808:
809: # ----------------------------- Subscribe to a resource, return URL if possible
810:
811: sub subscribe {
812: my $fname=shift;
813: if ($fname=~/\/(aboutme|syllabus|bulletinboard|smppg)$/) { return ''; }
814: my $author=$fname;
815: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
816: my ($udom,$uname)=split(/\//,$author);
817: my $home=homeserver($uname,$udom);
818: if ($home eq 'no_host') {
819: return 'not_found';
820: }
821: my $answer=reply("sub:$fname",$home);
822: if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
823: $answer.=' by '.$home;
824: }
825: return $answer;
826: }
827:
828: # -------------------------------------------------------------- Replicate file
829:
830: sub repcopy {
831: my $filename=shift;
832: $filename=~s/\/+/\//g;
833: if ($filename=~/^\/home\/httpd\/html\/adm\//) { return OK; }
834: my $transname="$filename.in.transfer";
835: if ((-e $filename) || (-e $transname)) { return OK; }
836: my $remoteurl=subscribe($filename);
837: if ($remoteurl =~ /^con_lost by/) {
838: &logthis("Subscribe returned $remoteurl: $filename");
839: return HTTP_SERVICE_UNAVAILABLE;
840: } elsif ($remoteurl eq 'not_found') {
841: &logthis("Subscribe returned not_found: $filename");
842: return HTTP_NOT_FOUND;
843: } elsif ($remoteurl =~ /^rejected by/) {
844: &logthis("Subscribe returned $remoteurl: $filename");
845: return FORBIDDEN;
846: } elsif ($remoteurl eq 'directory') {
847: return OK;
848: } else {
849: my $author=$filename;
850: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
851: my ($udom,$uname)=split(/\//,$author);
852: my $home=homeserver($uname,$udom);
853: unless ($home eq $perlvar{'lonHostID'}) {
854: my @parts=split(/\//,$filename);
855: my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";
856: if ($path ne "$perlvar{'lonDocRoot'}/res") {
857: &logthis("Malconfiguration for replication: $filename");
858: return HTTP_BAD_REQUEST;
859: }
860: my $count;
861: for ($count=5;$count<$#parts;$count++) {
862: $path.="/$parts[$count]";
863: if ((-e $path)!=1) {
864: mkdir($path,0777);
865: }
866: }
867: my $ua=new LWP::UserAgent;
868: my $request=new HTTP::Request('GET',"$remoteurl");
869: my $response=$ua->request($request,$transname);
870: if ($response->is_error()) {
871: unlink($transname);
872: my $message=$response->status_line;
873: &logthis("<font color=blue>WARNING:"
874: ." LWP get: $message: $filename</font>");
875: return HTTP_SERVICE_UNAVAILABLE;
876: } else {
877: if ($remoteurl!~/\.meta$/) {
878: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
879: my $mresponse=$ua->request($mrequest,$filename.'.meta');
880: if ($mresponse->is_error()) {
881: unlink($filename.'.meta');
882: &logthis(
883: "<font color=yellow>INFO: No metadata: $filename</font>");
884: }
885: }
886: rename($transname,$filename);
887: return OK;
888: }
889: }
890: }
891: }
892:
893: # ------------------------------------------------ Get server side include body
894: sub ssi_body {
895: my $filelink=shift;
896: my $output=($filelink=~/^http\:/?&externalssi($filelink):
897: &ssi($filelink));
898: $output=~s/^.*\<body[^\>]*\>//si;
899: $output=~s/\<\/body\s*\>.*$//si;
900: $output=~
901: s/\/\/ BEGIN LON\-CAPA Internal.+\/\/ END LON\-CAPA Internal\s//gs;
902: return $output;
903: }
904:
905: # --------------------------------------------------------- Server Side Include
906:
907: sub ssi {
908:
909: my ($fn,%form)=@_;
910:
911: my $ua=new LWP::UserAgent;
912:
913: my $request;
914:
915: if (%form) {
916: $request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);
917: $request->content(join('&',map { &escape($_).'='.&escape($form{$_}) } keys %form));
918: } else {
919: $request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);
920: }
921:
922: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
923: my $response=$ua->request($request);
924:
925: return $response->content;
926: }
927:
928: sub externalssi {
929: my ($url)=@_;
930: my $ua=new LWP::UserAgent;
931: my $request=new HTTP::Request('GET',$url);
932: my $response=$ua->request($request);
933: return $response->content;
934: }
935:
936: # ------- Add a token to a remote URI's query string to vouch for access rights
937:
938: sub tokenwrapper {
939: my $uri=shift;
940: $uri=~s/^http\:\/\/([^\/]+)//;
941: $uri=~s/^\///;
942: $ENV{'user.environment'}=~/\/([^\/]+)\.id/;
943: my $token=$1;
944: if ($uri=~/^uploaded\/([^\/]+)\/([^\/]+)\/([^\/]+)(\?\.*)*$/) {
945: &appenv('userfile.'.$1.'/'.$2.'/'.$3 => $ENV{'request.course.id'});
946: return 'http://'.$hostname{ &homeserver($2,$1)}.'/'.$uri.
947: (($uri=~/\?/)?'&':'?').'token='.$token.
948: '&tokenissued='.$perlvar{'lonHostID'};
949: } else {
950: return '/adm/notfound.html';
951: }
952: }
953:
954: # --------------- Take an uploaded file and put it into the userfiles directory
955: # input: name of form element, coursedoc=1 means this is for the course
956: # output: url of file in userspace
957:
958: sub userfileupload {
959: my ($formname,$coursedoc)=@_;
960: my $fname=$ENV{'form.'.$formname.'.filename'};
961: # Replace Windows backslashes by forward slashes
962: $fname=~s/\\/\//g;
963: # Get rid of everything but the actual filename
964: $fname=~s/^.*\/([^\/]+)$/$1/;
965: # Replace spaces by underscores
966: $fname=~s/\s+/\_/g;
967: # Replace all other weird characters by nothing
968: $fname=~s/[^\w\.\-]//g;
969: # See if there is anything left
970: unless ($fname) { return 'error: no uploaded file'; }
971: chop($ENV{'form.'.$formname});
972: # Create the directory if not present
973: my $docuname='';
974: my $docudom='';
975: my $docuhome='';
976: if ($coursedoc) {
977: $docuname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
978: $docudom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
979: $docuhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
980: } else {
981: $docuname=$ENV{'user.name'};
982: $docudom=$ENV{'user.domain'};
983: $docuhome=$ENV{'user.home'};
984: }
985: return
986: &finishuserfileupload($docuname,$docudom,$docuhome,$formname,$fname);
987: }
988:
989: sub finishuserfileupload {
990: my ($docuname,$docudom,$docuhome,$formname,$fname)=@_;
991: my $path=$docudom.'/'.$docuname.'/';
992: my $filepath=$perlvar{'lonDocRoot'};
993: my @parts=split(/\//,$filepath.'/userfiles/'.$path);
994: my $count;
995: for ($count=4;$count<=$#parts;$count++) {
996: $filepath.="/$parts[$count]";
997: if ((-e $filepath)!=1) {
998: mkdir($filepath,0777);
999: }
1000: }
1001: # Save the file
1002: {
1003: my $fh=Apache::File->new('>'.$filepath.'/'.$fname);
1004: print $fh $ENV{'form.'.$formname};
1005: }
1006: # Notify homeserver to grep it
1007: #
1008:
1009: my $fetchresult=
1010: &reply('fetchuserfile:'.$docudom.'/'.$docuname.'/'.$fname,$docuhome);
1011: if ($fetchresult eq 'ok') {
1012: #
1013: # Return the URL to it
1014: return '/uploaded/'.$path.$fname;
1015: } else {
1016: &logthis('Failed to transfer '.$docudom.'/'.$docuname.'/'.$fname.
1017: ' to host '.$docuhome.': '.$fetchresult);
1018: return '/adm/notfound.html';
1019: }
1020: }
1021:
1022: # ------------------------------------------------------------------------- Log
1023:
1024: sub log {
1025: my ($dom,$nam,$hom,$what)=@_;
1026: return critical("log:$dom:$nam:$what",$hom);
1027: }
1028:
1029: # ------------------------------------------------------------------ Course Log
1030:
1031: sub flushcourselogs {
1032: &logthis('Flushing course log buffers');
1033: foreach (keys %courselogs) {
1034: my $crsid=$_;
1035: if (&reply('log:'.$coursedombuf{$crsid}.':'.
1036: &escape($courselogs{$crsid}),
1037: $coursehombuf{$crsid}) eq 'ok') {
1038: delete $courselogs{$crsid};
1039: } else {
1040: &logthis('Failed to flush log buffer for '.$crsid);
1041: if (length($courselogs{$crsid})>40000) {
1042: &logthis("<font color=blue>WARNING: Buffer for ".$crsid.
1043: " exceeded maximum size, deleting.</font>");
1044: delete $courselogs{$crsid};
1045: }
1046: }
1047: }
1048: &logthis('Flushing access logs');
1049: foreach (keys %accesshash) {
1050: my $entry=$_;
1051: $entry=~/\_\_\_(\w+)\/(\w+)\/(.*)\_\_\_(\w+)$/;
1052: my %temphash=($entry => $accesshash{$entry});
1053: if (&Apache::lonnet::put('nohist_resevaldata',\%temphash,$1,$2) eq 'ok') {
1054: delete $accesshash{$entry};
1055: }
1056: }
1057: &logthis('Flushing role logs');
1058: foreach (keys %userrolehash) {
1059: my $entry=$_;
1060: my ($role,$uname,$udom,$runame,$rudom)=
1061: split(/\:/,$entry);
1062: if (&Apache::lonnet::put('nohist_userroles',
1063: { $role.':'.$uname.':'.$udom => $userrolehash{$entry} },
1064: $rudom,$runame) eq 'ok') {
1065: delete $userrolehash{$entry};
1066: }
1067: }
1068: $dumpcount++;
1069: }
1070:
1071: sub courselog {
1072: my $what=shift;
1073: $what=time.':'.$what;
1074: unless ($ENV{'request.course.id'}) { return ''; }
1075: $coursedombuf{$ENV{'request.course.id'}}=
1076: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.
1077: $ENV{'course.'.$ENV{'request.course.id'}.'.num'};
1078: $coursehombuf{$ENV{'request.course.id'}}=
1079: $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
1080: if (defined $courselogs{$ENV{'request.course.id'}}) {
1081: $courselogs{$ENV{'request.course.id'}}.='&'.$what;
1082: } else {
1083: $courselogs{$ENV{'request.course.id'}}.=$what;
1084: }
1085: if (length($courselogs{$ENV{'request.course.id'}})>4048) {
1086: &flushcourselogs();
1087: }
1088: }
1089:
1090: sub courseacclog {
1091: my $fnsymb=shift;
1092: unless ($ENV{'request.course.id'}) { return ''; }
1093: my $what=$fnsymb.':'.$ENV{'user.name'}.':'.$ENV{'user.domain'};
1094: if ($fnsymb=~/(problem|exam|quiz|assess|survey|form)$/) {
1095: $what.=':POST';
1096: foreach (keys %ENV) {
1097: if ($_=~/^form\.(.*)/) {
1098: $what.=':'.$1.'='.$ENV{$_};
1099: }
1100: }
1101: }
1102: &courselog($what);
1103: }
1104:
1105: sub countacc {
1106: my $url=&declutter(shift);
1107: unless ($ENV{'request.course.id'}) { return ''; }
1108: $accesshash{$ENV{'request.course.id'}.'___'.$url.'___course'}=1;
1109: my $key=$$.$processmarker.'_'.$dumpcount.'___'.$url.'___count';
1110: if (defined($accesshash{$key})) {
1111: $accesshash{$key}++;
1112: } else {
1113: $accesshash{$key}=1;
1114: }
1115: }
1116:
1117: sub userrolelog {
1118: my ($trole,$username,$domain,$area,$tstart,$tend)=@_;
1119: if (($trole=~/^ca/) || ($trole=~/^in/) ||
1120: ($trole=~/^cc/) || ($trole=~/^ep/) ||
1121: ($trole=~/^cr/)) {
1122: my (undef,$rudom,$runame)=split(/\//,$area);
1123: $userrolehash{$trole.':'.$username.':'.$domain.':'.$runame.':'.$rudom}
1124: =$tend.':'.$tstart;
1125: }
1126: }
1127: # ----------------------------------------------------------- Check out an item
1128:
1129: sub checkout {
1130: my ($symb,$tuname,$tudom,$tcrsid)=@_;
1131: my $now=time;
1132: my $lonhost=$perlvar{'lonHostID'};
1133: my $infostr=&escape(
1134: 'CHECKOUTTOKEN&'.
1135: $tuname.'&'.
1136: $tudom.'&'.
1137: $tcrsid.'&'.
1138: $symb.'&'.
1139: $now.'&'.$ENV{'REMOTE_ADDR'});
1140: my $token=&reply('tmpput:'.$infostr,$lonhost);
1141: if ($token=~/^error\:/) {
1142: &logthis("<font color=blue>WARNING: ".
1143: "Checkout tmpput failed ".$tudom.' - '.$tuname.' - '.$symb.
1144: "</font>");
1145: return '';
1146: }
1147:
1148: $token=~s/^(\d+)\_.*\_(\d+)$/$1\*$2\*$lonhost/;
1149: $token=~tr/a-z/A-Z/;
1150:
1151: my %infohash=('resource.0.outtoken' => $token,
1152: 'resource.0.checkouttime' => $now,
1153: 'resource.0.outremote' => $ENV{'REMOTE_ADDR'});
1154:
1155: unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
1156: return '';
1157: } else {
1158: &logthis("<font color=blue>WARNING: ".
1159: "Checkout cstore failed ".$tudom.' - '.$tuname.' - '.$symb.
1160: "</font>");
1161: }
1162:
1163: if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
1164: &escape('Checkout '.$infostr.' - '.
1165: $token)) ne 'ok') {
1166: return '';
1167: } else {
1168: &logthis("<font color=blue>WARNING: ".
1169: "Checkout log failed ".$tudom.' - '.$tuname.' - '.$symb.
1170: "</font>");
1171: }
1172: return $token;
1173: }
1174:
1175: # ------------------------------------------------------------ Check in an item
1176:
1177: sub checkin {
1178: my $token=shift;
1179: my $now=time;
1180: my ($ta,$tb,$lonhost)=split(/\*/,$token);
1181: $lonhost=~tr/A-Z/a-z/;
1182: my $dtoken=$ta.'_'.$hostip{$lonhost}.'_'.$tb;
1183: $dtoken=~s/\W/\_/g;
1184: my ($dummy,$tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=
1185: split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));
1186:
1187: unless (($tuname) && ($tudom)) {
1188: &logthis('Check in '.$token.' ('.$dtoken.') failed');
1189: return '';
1190: }
1191:
1192: unless (&allowed('mgr',$tcrsid)) {
1193: &logthis('Check in '.$token.' ('.$dtoken.') unauthorized: '.
1194: $ENV{'user.name'}.' - '.$ENV{'user.domain'});
1195: return '';
1196: }
1197:
1198: my %infohash=('resource.0.intoken' => $token,
1199: 'resource.0.checkintime' => $now,
1200: 'resource.0.inremote' => $ENV{'REMOTE_ADDR'});
1201:
1202: unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
1203: return '';
1204: }
1205:
1206: if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
1207: &escape('Checkin - '.$token)) ne 'ok') {
1208: return '';
1209: }
1210:
1211: return ($symb,$tuname,$tudom,$tcrsid);
1212: }
1213:
1214: # --------------------------------------------- Set Expire Date for Spreadsheet
1215:
1216: sub expirespread {
1217: my ($uname,$udom,$stype,$usymb)=@_;
1218: my $cid=$ENV{'request.course.id'};
1219: if ($cid) {
1220: my $now=time;
1221: my $key=$uname.':'.$udom.':'.$stype.':'.$usymb;
1222: return &reply('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
1223: $ENV{'course.'.$cid.'.num'}.
1224: ':nohist_expirationdates:'.
1225: &escape($key).'='.$now,
1226: $ENV{'course.'.$cid.'.home'})
1227: }
1228: return 'ok';
1229: }
1230:
1231: # ----------------------------------------------------- Devalidate Spreadsheets
1232:
1233: sub devalidate {
1234: my ($symb,$uname,$udom)=@_;
1235: my $cid=$ENV{'request.course.id'};
1236: if ($cid) {
1237: # delete the stored spreadsheets for
1238: # - the student level sheet of this user in course's homespace
1239: # - the assessment level sheet for this resource
1240: # for this user in user's homespace
1241: my $key=$uname.':'.$udom.':';
1242: my $status=
1243: &del('nohist_calculatedsheets',
1244: [$key.'studentcalc'],
1245: $ENV{'course.'.$cid.'.domain'},
1246: $ENV{'course.'.$cid.'.num'})
1247: .' '.
1248: &del('nohist_calculatedsheets_'.$cid,
1249: [$key.'assesscalc:'.$symb]);
1250: unless ($status eq 'ok ok') {
1251: &logthis('Could not devalidate spreadsheet '.
1252: $uname.' at '.$udom.' for '.
1253: $symb.': '.$status);
1254: }
1255: }
1256: }
1257:
1258: sub get_scalar {
1259: my ($string,$end) = @_;
1260: my $value;
1261: if ($$string =~ s/^([^&]*?)($end)/$2/) {
1262: $value = $1;
1263: } elsif ($$string =~ s/^([^&]*?)&//) {
1264: $value = $1;
1265: }
1266: return &unescape($value);
1267: }
1268:
1269: sub array2str {
1270: my (@array) = @_;
1271: my $result=&arrayref2str(\@array);
1272: $result=~s/^__ARRAY_REF__//;
1273: $result=~s/__END_ARRAY_REF__$//;
1274: return $result;
1275: }
1276:
1277: sub arrayref2str {
1278: my ($arrayref) = @_;
1279: my $result='__ARRAY_REF__';
1280: foreach my $elem (@$arrayref) {
1281: if(ref($elem) eq 'ARRAY') {
1282: $result.=&arrayref2str($elem).'&';
1283: } elsif(ref($elem) eq 'HASH') {
1284: $result.=&hashref2str($elem).'&';
1285: } elsif(ref($elem)) {
1286: #print("Got a ref of ".(ref($elem))." skipping.");
1287: } else {
1288: $result.=&escape($elem).'&';
1289: }
1290: }
1291: $result=~s/\&$//;
1292: $result .= '__END_ARRAY_REF__';
1293: return $result;
1294: }
1295:
1296: sub hash2str {
1297: my (%hash) = @_;
1298: my $result=&hashref2str(\%hash);
1299: $result=~s/^__HASH_REF__//;
1300: $result=~s/__END_HASH_REF__$//;
1301: return $result;
1302: }
1303:
1304: sub hashref2str {
1305: my ($hashref)=@_;
1306: my $result='__HASH_REF__';
1307: foreach (keys(%$hashref)) {
1308: if (ref($_) eq 'ARRAY') {
1309: $result.=&arrayref2str($_).'=';
1310: } elsif (ref($_) eq 'HASH') {
1311: $result.=&hashref2str($_).'=';
1312: } elsif (ref($_)) {
1313: $result.='=';
1314: #print("Got a ref of ".(ref($_))." skipping.");
1315: } else {
1316: if ($_) {$result.=&escape($_).'=';} else { last; }
1317: }
1318:
1319: if(ref($hashref->{$_}) eq 'ARRAY') {
1320: $result.=&arrayref2str($hashref->{$_}).'&';
1321: } elsif(ref($hashref->{$_}) eq 'HASH') {
1322: $result.=&hashref2str($hashref->{$_}).'&';
1323: } elsif(ref($hashref->{$_})) {
1324: $result.='&';
1325: #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
1326: } else {
1327: $result.=&escape($hashref->{$_}).'&';
1328: }
1329: }
1330: $result=~s/\&$//;
1331: $result .= '__END_HASH_REF__';
1332: return $result;
1333: }
1334:
1335: sub str2hash {
1336: my ($string)=@_;
1337: my ($hash)=&str2hashref('__HASH_REF__'.$string.'__END_HASH_REF__');
1338: return %$hash;
1339: }
1340:
1341: sub str2hashref {
1342: my ($string) = @_;
1343:
1344: my %hash;
1345:
1346: if($string !~ /^__HASH_REF__/) {
1347: if (! ($string eq '' || !defined($string))) {
1348: $hash{'error'}='Not hash reference';
1349: }
1350: return (\%hash, $string);
1351: }
1352:
1353: $string =~ s/^__HASH_REF__//;
1354:
1355: while($string !~ /^__END_HASH_REF__/) {
1356: #key
1357: my $key='';
1358: if($string =~ /^__HASH_REF__/) {
1359: ($key, $string)=&str2hashref($string);
1360: if(defined($key->{'error'})) {
1361: $hash{'error'}='Bad data';
1362: return (\%hash, $string);
1363: }
1364: } elsif($string =~ /^__ARRAY_REF__/) {
1365: ($key, $string)=&str2arrayref($string);
1366: if($key->[0] eq 'Array reference error') {
1367: $hash{'error'}='Bad data';
1368: return (\%hash, $string);
1369: }
1370: } else {
1371: $string =~ s/^(.*?)=//;
1372: $key=&unescape($1);
1373: }
1374: $string =~ s/^=//;
1375:
1376: #value
1377: my $value='';
1378: if($string =~ /^__HASH_REF__/) {
1379: ($value, $string)=&str2hashref($string);
1380: if(defined($value->{'error'})) {
1381: $hash{'error'}='Bad data';
1382: return (\%hash, $string);
1383: }
1384: } elsif($string =~ /^__ARRAY_REF__/) {
1385: ($value, $string)=&str2arrayref($string);
1386: if($value->[0] eq 'Array reference error') {
1387: $hash{'error'}='Bad data';
1388: return (\%hash, $string);
1389: }
1390: } else {
1391: $value=&get_scalar(\$string,'__END_HASH_REF__');
1392: }
1393: $string =~ s/^&//;
1394:
1395: $hash{$key}=$value;
1396: }
1397:
1398: $string =~ s/^__END_HASH_REF__//;
1399:
1400: return (\%hash, $string);
1401: }
1402:
1403: sub str2array {
1404: my ($string)=@_;
1405: my ($array)=&str2arrayref('__ARRAY_REF__'.$string.'__END_ARRAY_REF__');
1406: return @$array;
1407: }
1408:
1409: sub str2arrayref {
1410: my ($string) = @_;
1411: my @array;
1412:
1413: if($string !~ /^__ARRAY_REF__/) {
1414: if (! ($string eq '' || !defined($string))) {
1415: $array[0]='Array reference error';
1416: }
1417: return (\@array, $string);
1418: }
1419:
1420: $string =~ s/^__ARRAY_REF__//;
1421:
1422: while($string !~ /^__END_ARRAY_REF__/) {
1423: my $value='';
1424: if($string =~ /^__HASH_REF__/) {
1425: ($value, $string)=&str2hashref($string);
1426: if(defined($value->{'error'})) {
1427: $array[0] ='Array reference error';
1428: return (\@array, $string);
1429: }
1430: } elsif($string =~ /^__ARRAY_REF__/) {
1431: ($value, $string)=&str2arrayref($string);
1432: if($value->[0] eq 'Array reference error') {
1433: $array[0] ='Array reference error';
1434: return (\@array, $string);
1435: }
1436: } else {
1437: $value=&get_scalar(\$string,'__END_ARRAY_REF__');
1438: }
1439: $string =~ s/^&//;
1440:
1441: push(@array, $value);
1442: }
1443:
1444: $string =~ s/^__END_ARRAY_REF__//;
1445:
1446: return (\@array, $string);
1447: }
1448:
1449: # -------------------------------------------------------------------Temp Store
1450:
1451: sub tmpreset {
1452: my ($symb,$namespace,$domain,$stuname) = @_;
1453: if (!$symb) {
1454: $symb=&symbread();
1455: if (!$symb) { $symb= $ENV{'REQUEST_URI'}; }
1456: }
1457: $symb=escape($symb);
1458:
1459: if (!$namespace) { $namespace=$ENV{'request.state'}; }
1460: $namespace=~s/\//\_/g;
1461: $namespace=~s/\W//g;
1462:
1463: #FIXME needs to do something for /pub resources
1464: if (!$domain) { $domain=$ENV{'user.domain'}; }
1465: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1466: my $path=$perlvar{'lonDaemons'}.'/tmp';
1467: my %hash;
1468: if (tie(%hash,'GDBM_File',
1469: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1470: &GDBM_WRCREAT(),0640)) {
1471: foreach my $key (keys %hash) {
1472: if ($key=~ /:$symb/) {
1473: delete($hash{$key});
1474: }
1475: }
1476: }
1477: }
1478:
1479: sub tmpstore {
1480: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1481:
1482: if (!$symb) {
1483: $symb=&symbread();
1484: if (!$symb) { $symb= $ENV{'request.url'}; }
1485: }
1486: $symb=escape($symb);
1487:
1488: if (!$namespace) {
1489: # I don't think we would ever want to store this for a course.
1490: # it seems this will only be used if we don't have a course.
1491: #$namespace=$ENV{'request.course.id'};
1492: #if (!$namespace) {
1493: $namespace=$ENV{'request.state'};
1494: #}
1495: }
1496: $namespace=~s/\//\_/g;
1497: $namespace=~s/\W//g;
1498: #FIXME needs to do something for /pub resources
1499: if (!$domain) { $domain=$ENV{'user.domain'}; }
1500: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1501: my $now=time;
1502: my %hash;
1503: my $path=$perlvar{'lonDaemons'}.'/tmp';
1504: if (tie(%hash,'GDBM_File',
1505: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1506: &GDBM_WRCREAT(),0640)) {
1507: $hash{"version:$symb"}++;
1508: my $version=$hash{"version:$symb"};
1509: my $allkeys='';
1510: foreach my $key (keys(%$storehash)) {
1511: $allkeys.=$key.':';
1512: $hash{"$version:$symb:$key"}=$$storehash{$key};
1513: }
1514: $hash{"$version:$symb:timestamp"}=$now;
1515: $allkeys.='timestamp';
1516: $hash{"$version:keys:$symb"}=$allkeys;
1517: if (untie(%hash)) {
1518: return 'ok';
1519: } else {
1520: return "error:$!";
1521: }
1522: } else {
1523: return "error:$!";
1524: }
1525: }
1526:
1527: # -----------------------------------------------------------------Temp Restore
1528:
1529: sub tmprestore {
1530: my ($symb,$namespace,$domain,$stuname) = @_;
1531:
1532: if (!$symb) {
1533: $symb=&symbread();
1534: if (!$symb) { $symb= $ENV{'request.url'}; }
1535: }
1536: $symb=escape($symb);
1537:
1538: if (!$namespace) { $namespace=$ENV{'request.state'}; }
1539: #FIXME needs to do something for /pub resources
1540: if (!$domain) { $domain=$ENV{'user.domain'}; }
1541: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1542:
1543: my %returnhash;
1544: $namespace=~s/\//\_/g;
1545: $namespace=~s/\W//g;
1546: my %hash;
1547: my $path=$perlvar{'lonDaemons'}.'/tmp';
1548: if (tie(%hash,'GDBM_File',
1549: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1550: &GDBM_READER(),0640)) {
1551: my $version=$hash{"version:$symb"};
1552: $returnhash{'version'}=$version;
1553: my $scope;
1554: for ($scope=1;$scope<=$version;$scope++) {
1555: my $vkeys=$hash{"$scope:keys:$symb"};
1556: my @keys=split(/:/,$vkeys);
1557: my $key;
1558: $returnhash{"$scope:keys"}=$vkeys;
1559: foreach $key (@keys) {
1560: $returnhash{"$scope:$key"}=$hash{"$scope:$symb:$key"};
1561: $returnhash{"$key"}=$hash{"$scope:$symb:$key"};
1562: }
1563: }
1564: if (!(untie(%hash))) {
1565: return "error:$!";
1566: }
1567: } else {
1568: return "error:$!";
1569: }
1570: return %returnhash;
1571: }
1572:
1573: # ----------------------------------------------------------------------- Store
1574:
1575: sub store {
1576: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1577: my $home='';
1578:
1579: if ($stuname) { $home=&homeserver($stuname,$domain); }
1580:
1581: $symb=&symbclean($symb);
1582: if (!$symb) { unless ($symb=&symbread()) { return ''; } }
1583:
1584: if (!$domain) { $domain=$ENV{'user.domain'}; }
1585: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1586:
1587: &devalidate($symb,$stuname,$domain);
1588:
1589: $symb=escape($symb);
1590: if (!$namespace) {
1591: unless ($namespace=$ENV{'request.course.id'}) {
1592: return '';
1593: }
1594: }
1595: if (!$home) { $home=$ENV{'user.home'}; }
1596: my $namevalue='';
1597: foreach (keys %$storehash) {
1598: $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
1599: }
1600: $namevalue=~s/\&$//;
1601: &courselog($symb.':'.$stuname.':'.$domain.':STORE:'.$namevalue);
1602: return reply("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
1603: }
1604:
1605: # -------------------------------------------------------------- Critical Store
1606:
1607: sub cstore {
1608: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1609: my $home='';
1610:
1611: if ($stuname) { $home=&homeserver($stuname,$domain); }
1612:
1613: $symb=&symbclean($symb);
1614: if (!$symb) { unless ($symb=&symbread()) { return ''; } }
1615:
1616: if (!$domain) { $domain=$ENV{'user.domain'}; }
1617: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1618:
1619: &devalidate($symb,$stuname,$domain);
1620:
1621: $symb=escape($symb);
1622: if (!$namespace) {
1623: unless ($namespace=$ENV{'request.course.id'}) {
1624: return '';
1625: }
1626: }
1627: if (!$home) { $home=$ENV{'user.home'}; }
1628:
1629: my $namevalue='';
1630: foreach (keys %$storehash) {
1631: $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
1632: }
1633: $namevalue=~s/\&$//;
1634: &courselog($symb.':'.$stuname.':'.$domain.':CSTORE:'.$namevalue);
1635: return critical
1636: ("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
1637: }
1638:
1639: # --------------------------------------------------------------------- Restore
1640:
1641: sub restore {
1642: my ($symb,$namespace,$domain,$stuname) = @_;
1643: my $home='';
1644:
1645: if ($stuname) { $home=&homeserver($stuname,$domain); }
1646:
1647: if (!$symb) {
1648: unless ($symb=escape(&symbread())) { return ''; }
1649: } else {
1650: $symb=&escape(&symbclean($symb));
1651: }
1652: if (!$namespace) {
1653: unless ($namespace=$ENV{'request.course.id'}) {
1654: return '';
1655: }
1656: }
1657: if (!$domain) { $domain=$ENV{'user.domain'}; }
1658: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1659: if (!$home) { $home=$ENV{'user.home'}; }
1660: my $answer=&reply("restore:$domain:$stuname:$namespace:$symb","$home");
1661:
1662: my %returnhash=();
1663: foreach (split(/\&/,$answer)) {
1664: my ($name,$value)=split(/\=/,$_);
1665: $returnhash{&unescape($name)}=&unescape($value);
1666: }
1667: my $version;
1668: for ($version=1;$version<=$returnhash{'version'};$version++) {
1669: foreach (split(/\:/,$returnhash{$version.':keys'})) {
1670: $returnhash{$_}=$returnhash{$version.':'.$_};
1671: }
1672: }
1673: return %returnhash;
1674: }
1675:
1676: # ---------------------------------------------------------- Course Description
1677:
1678: sub coursedescription {
1679: my $courseid=shift;
1680: $courseid=~s/^\///;
1681: $courseid=~s/\_/\//g;
1682: my ($cdomain,$cnum)=split(/\//,$courseid);
1683: my $chome=&homeserver($cnum,$cdomain);
1684: my $normalid=$cdomain.'_'.$cnum;
1685: # need to always cache even if we get errors otherwise we keep
1686: # trying and trying and trying to get the course description.
1687: my %envhash=();
1688: my %returnhash=();
1689: $envhash{'course.'.$normalid.'.last_cache'}=time;
1690: if ($chome ne 'no_host') {
1691: %returnhash=&dump('environment',$cdomain,$cnum);
1692: if (!exists($returnhash{'con_lost'})) {
1693: $returnhash{'home'}= $chome;
1694: $returnhash{'domain'} = $cdomain;
1695: $returnhash{'num'} = $cnum;
1696: while (my ($name,$value) = each %returnhash) {
1697: $envhash{'course.'.$normalid.'.'.$name}=$value;
1698: }
1699: $returnhash{'url'}=&clutter($returnhash{'url'});
1700: $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
1701: $ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
1702: $envhash{'course.'.$normalid.'.home'}=$chome;
1703: $envhash{'course.'.$normalid.'.domain'}=$cdomain;
1704: $envhash{'course.'.$normalid.'.num'}=$cnum;
1705: }
1706: }
1707: &appenv(%envhash);
1708: return %returnhash;
1709: }
1710:
1711: # -------------------------------------------------------- Get user privileges
1712:
1713: sub rolesinit {
1714: my ($domain,$username,$authhost)=@_;
1715: my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
1716: if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return ''; }
1717: my %allroles=();
1718: my %thesepriv=();
1719: my $now=time;
1720: my $userroles="user.login.time=$now\n";
1721: my $thesestr;
1722:
1723: if ($rolesdump ne '') {
1724: foreach (split(/&/,$rolesdump)) {
1725: if ($_!~/^rolesdef\&/) {
1726: my ($area,$role)=split(/=/,$_);
1727: $area=~s/\_\w\w$//;
1728: my ($trole,$tend,$tstart)=split(/_/,$role);
1729: $userroles.='user.role.'.$trole.'.'.$area.'='.
1730: $tstart.'.'.$tend."\n";
1731: # log the associated role with the area
1732: &userrolelog($trole,$username,$domain,$area,$tstart,$tend);
1733: if ($tend!=0) {
1734: if ($tend<$now) {
1735: $trole='';
1736: }
1737: }
1738: if ($tstart!=0) {
1739: if ($tstart>$now) {
1740: $trole='';
1741: }
1742: }
1743: if (($area ne '') && ($trole ne '')) {
1744: my $spec=$trole.'.'.$area;
1745: my ($tdummy,$tdomain,$trest)=split(/\//,$area);
1746: if ($trole =~ /^cr\//) {
1747: my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
1748: my $homsvr=homeserver($rauthor,$rdomain);
1749: if ($hostname{$homsvr} ne '') {
1750: my $roledef=
1751: reply("get:$rdomain:$rauthor:roles:rolesdef_$rrole",
1752: $homsvr);
1753: if (($roledef ne 'con_lost') && ($roledef ne '')) {
1754: my ($syspriv,$dompriv,$coursepriv)=
1755: split(/\_/,unescape($roledef));
1756: if (defined($syspriv)) {
1757: $allroles{'cm./'}.=':'.$syspriv;
1758: $allroles{$spec.'./'}.=':'.$syspriv;
1759: }
1760: if ($tdomain ne '') {
1761: if (defined($dompriv)) {
1762: $allroles{'cm./'.$tdomain.'/'}.=':'.$dompriv;
1763: $allroles{$spec.'./'.$tdomain.'/'}.=':'.$dompriv;
1764: }
1765: if ($trest ne '') {
1766: if (defined($coursepriv)) {
1767: $allroles{'cm.'.$area}.=':'.$coursepriv;
1768: $allroles{$spec.'.'.$area}.=':'.$coursepriv;
1769: }
1770: }
1771: }
1772: }
1773: }
1774: } else {
1775: if (defined($pr{$trole.':s'})) {
1776: $allroles{'cm./'}.=':'.$pr{$trole.':s'};
1777: $allroles{$spec.'./'}.=':'.$pr{$trole.':s'};
1778: }
1779: if ($tdomain ne '') {
1780: if (defined($pr{$trole.':d'})) {
1781: $allroles{'cm./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
1782: $allroles{$spec.'./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
1783: }
1784: if ($trest ne '') {
1785: if (defined($pr{$trole.':c'})) {
1786: $allroles{'cm.'.$area}.=':'.$pr{$trole.':c'};
1787: $allroles{$spec.'.'.$area}.=':'.$pr{$trole.':c'};
1788: }
1789: }
1790: }
1791: }
1792: }
1793: }
1794: }
1795: my $adv=0;
1796: my $author=0;
1797: foreach (keys %allroles) {
1798: %thesepriv=();
1799: if (($_!~/^st/) && ($_!~/^ta/) && ($_!~/^cm/)) { $adv=1; }
1800: if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }
1801: foreach (split(/:/,$allroles{$_})) {
1802: if ($_ ne '') {
1803: my ($privilege,$restrictions)=split(/&/,$_);
1804: if ($restrictions eq '') {
1805: $thesepriv{$privilege}='F';
1806: } else {
1807: if ($thesepriv{$privilege} ne 'F') {
1808: $thesepriv{$privilege}.=$restrictions;
1809: }
1810: }
1811: }
1812: }
1813: $thesestr='';
1814: foreach (keys %thesepriv) { $thesestr.=':'.$_.'&'.$thesepriv{$_}; }
1815: $userroles.='user.priv.'.$_.'='.$thesestr."\n";
1816: }
1817: $userroles.='user.adv='.$adv."\n".
1818: 'user.author='.$author."\n";
1819: $ENV{'user.adv'}=$adv;
1820: }
1821: return $userroles;
1822: }
1823:
1824: # --------------------------------------------------------------- get interface
1825:
1826: sub get {
1827: my ($namespace,$storearr,$udomain,$uname)=@_;
1828: my $items='';
1829: foreach (@$storearr) {
1830: $items.=escape($_).'&';
1831: }
1832: $items=~s/\&$//;
1833: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1834: if (!$uname) { $uname=$ENV{'user.name'}; }
1835: my $uhome=&homeserver($uname,$udomain);
1836:
1837: my $rep=&reply("get:$udomain:$uname:$namespace:$items",$uhome);
1838: my @pairs=split(/\&/,$rep);
1839: if ( $#pairs==0 && $pairs[0] =~ /^(con_lost|error|no_such_host)/i) {
1840: return @pairs;
1841: }
1842: my %returnhash=();
1843: my $i=0;
1844: foreach (@$storearr) {
1845: $returnhash{$_}=unescape($pairs[$i]);
1846: $i++;
1847: }
1848: return %returnhash;
1849: }
1850:
1851: # --------------------------------------------------------------- del interface
1852:
1853: sub del {
1854: my ($namespace,$storearr,$udomain,$uname)=@_;
1855: my $items='';
1856: foreach (@$storearr) {
1857: $items.=escape($_).'&';
1858: }
1859: $items=~s/\&$//;
1860: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1861: if (!$uname) { $uname=$ENV{'user.name'}; }
1862: my $uhome=&homeserver($uname,$udomain);
1863:
1864: return &reply("del:$udomain:$uname:$namespace:$items",$uhome);
1865: }
1866:
1867: # -------------------------------------------------------------- dump interface
1868:
1869: sub dump {
1870: my ($namespace,$udomain,$uname,$regexp)=@_;
1871: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1872: if (!$uname) { $uname=$ENV{'user.name'}; }
1873: my $uhome=&homeserver($uname,$udomain);
1874: if ($regexp) {
1875: $regexp=&escape($regexp);
1876: } else {
1877: $regexp='.';
1878: }
1879: my $rep=reply("dump:$udomain:$uname:$namespace:$regexp",$uhome);
1880: my @pairs=split(/\&/,$rep);
1881: my %returnhash=();
1882: foreach (@pairs) {
1883: my ($key,$value)=split(/=/,$_);
1884: $returnhash{unescape($key)}=unescape($value);
1885: }
1886: return %returnhash;
1887: }
1888:
1889: # --------------------------------------------------------------- currentdump
1890: sub currentdump {
1891: my ($courseid,$sdom,$sname)=@_;
1892: $courseid = $ENV{'request.course.id'} if (! defined($courseid));
1893: $sdom = $ENV{'user.domain'} if (! defined($sdom));
1894: $sname = $ENV{'user.name'} if (! defined($sname));
1895: my $uhome = &homeserver($sname,$sdom);
1896: my $rep=reply('currentdump:'.$sdom.':'.$sname.':'.$courseid,$uhome);
1897: return if ($rep =~ /^(error:|no_such_host)/);
1898: #
1899: my %returnhash=();
1900: #
1901: if ($rep eq "unknown_cmd") {
1902: # an old lond will not know currentdump
1903: # Do a dump and make it look like a currentdump
1904: my @tmp = &dump($courseid,$sdom,$sname,'.');
1905: return if ($tmp[0] =~ /^(error:|no_such_host)/);
1906: my %hash = @tmp;
1907: @tmp=();
1908: # Code ripped from lond, essentially. The only difference
1909: # here is the unescaping done by lonnet::dump(). Conceivably
1910: # we might run in to problems with parameter names =~ /^v\./
1911: while (my ($key,$value) = each(%hash)) {
1912: my ($v,$symb,$param) = split(/:/,$key);
1913: next if ($v eq 'version' || $symb eq 'keys');
1914: next if (exists($returnhash{$symb}) &&
1915: exists($returnhash{$symb}->{$param}) &&
1916: $returnhash{$symb}->{'v.'.$param} > $v);
1917: $returnhash{$symb}->{$param}=$value;
1918: $returnhash{$symb}->{'v.'.$param}=$v;
1919: }
1920: #
1921: # Remove all of the keys in the hashes which keep track of
1922: # the version of the parameter.
1923: while (my ($symb,$param_hash) = each(%returnhash)) {
1924: # use a foreach because we are going to delete from the hash.
1925: foreach my $key (keys(%$param_hash)) {
1926: delete($param_hash->{$key}) if ($key =~ /^v\./);
1927: }
1928: }
1929: } else {
1930: my @pairs=split(/\&/,$rep);
1931: foreach (@pairs) {
1932: my ($key,$value)=split(/=/,$_);
1933: my ($symb,$param) = split(/:/,$key);
1934: $returnhash{&unescape($symb)}->{&unescape($param)} =
1935: &unescape($value);
1936: }
1937: }
1938: return %returnhash;
1939: }
1940:
1941: # --------------------------------------------------------------- put interface
1942:
1943: sub put {
1944: my ($namespace,$storehash,$udomain,$uname)=@_;
1945: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1946: if (!$uname) { $uname=$ENV{'user.name'}; }
1947: my $uhome=&homeserver($uname,$udomain);
1948: my $items='';
1949: foreach (keys %$storehash) {
1950: $items.=&escape($_).'='.&escape($$storehash{$_}).'&';
1951: }
1952: $items=~s/\&$//;
1953: return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
1954: }
1955:
1956: # ------------------------------------------------------ critical put interface
1957:
1958: sub cput {
1959: my ($namespace,$storehash,$udomain,$uname)=@_;
1960: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1961: if (!$uname) { $uname=$ENV{'user.name'}; }
1962: my $uhome=&homeserver($uname,$udomain);
1963: my $items='';
1964: foreach (keys %$storehash) {
1965: $items.=escape($_).'='.escape($$storehash{$_}).'&';
1966: }
1967: $items=~s/\&$//;
1968: return &critical("put:$udomain:$uname:$namespace:$items",$uhome);
1969: }
1970:
1971: # -------------------------------------------------------------- eget interface
1972:
1973: sub eget {
1974: my ($namespace,$storearr,$udomain,$uname)=@_;
1975: my $items='';
1976: foreach (@$storearr) {
1977: $items.=escape($_).'&';
1978: }
1979: $items=~s/\&$//;
1980: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1981: if (!$uname) { $uname=$ENV{'user.name'}; }
1982: my $uhome=&homeserver($uname,$udomain);
1983: my $rep=&reply("eget:$udomain:$uname:$namespace:$items",$uhome);
1984: my @pairs=split(/\&/,$rep);
1985: my %returnhash=();
1986: my $i=0;
1987: foreach (@$storearr) {
1988: $returnhash{$_}=unescape($pairs[$i]);
1989: $i++;
1990: }
1991: return %returnhash;
1992: }
1993:
1994: # ---------------------------------------------- Custom access rule evaluation
1995:
1996: sub customaccess {
1997: my ($priv,$uri)=@_;
1998: my ($urole,$urealm)=split(/\./,$ENV{'request.role'});
1999: $urealm=~s/^\W//;
2000: my ($udom,$ucrs,$usec)=split(/\//,$urealm);
2001: my $access=0;
2002: foreach (split(/\s*\,\s*/,&metadata($uri,'rule_rights'))) {
2003: my ($effect,$realm,$role)=split(/\:/,$_);
2004: if ($role) {
2005: if ($role ne $urole) { next; }
2006: }
2007: foreach (split(/\s*\,\s*/,$realm)) {
2008: my ($tdom,$tcrs,$tsec)=split(/\_/,$_);
2009: if ($tdom) {
2010: if ($tdom ne $udom) { next; }
2011: }
2012: if ($tcrs) {
2013: if ($tcrs ne $ucrs) { next; }
2014: }
2015: if ($tsec) {
2016: if ($tsec ne $usec) { next; }
2017: }
2018: $access=($effect eq 'allow');
2019: last;
2020: }
2021: }
2022: return $access;
2023: }
2024:
2025: # ------------------------------------------------- Check for a user privilege
2026:
2027: sub allowed {
2028: my ($priv,$uri)=@_;
2029:
2030: my $orguri=$uri;
2031: $uri=&declutter($uri);
2032:
2033: # Free bre access to adm and meta resources
2034:
2035: if ((($uri=~/^adm\//) || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {
2036: return 'F';
2037: }
2038:
2039: # Free bre to public access
2040:
2041: if ($priv eq 'bre') {
2042: my $copyright=&metadata($uri,'copyright');
2043: if (($copyright eq 'public') && (!$ENV{'request.course.id'})) {
2044: return 'F';
2045: }
2046: if ($copyright eq 'priv') {
2047: $uri=~/([^\/]+)\/([^\/]+)\//;
2048: unless (($ENV{'user.name'} eq $2) && ($ENV{'user.domain'} eq $1)) {
2049: return '';
2050: }
2051: }
2052: if ($copyright eq 'domain') {
2053: $uri=~/([^\/]+)\/([^\/]+)\//;
2054: unless (($ENV{'user.domain'} eq $1) ||
2055: ($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $1)) {
2056: return '';
2057: }
2058: }
2059: if ($ENV{'request.role'}=~ /li\.\//) {
2060: # Library role, so allow browsing of resources in this domain.
2061: return 'F';
2062: }
2063: if ($copyright eq 'custom') {
2064: unless (&customaccess($priv,$uri)) { return ''; }
2065: }
2066: }
2067: # Domain coordinator is trying to create a course
2068: if (($priv eq 'ccc') && ($ENV{'request.role'} =~ /^dc\./)) {
2069: # uri is the requested domain in this case.
2070: # comparison to 'request.role.domain' shows if the user has selected
2071: # a role of dc for the domain in question.
2072: return 'F' if ($uri eq $ENV{'request.role.domain'});
2073: }
2074:
2075: my $thisallowed='';
2076: my $statecond=0;
2077: my $courseprivid='';
2078:
2079: # Course
2080:
2081: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'}=~/$priv\&([^\:]*)/) {
2082: $thisallowed.=$1;
2083: }
2084:
2085: # Domain
2086:
2087: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
2088: =~/$priv\&([^\:]*)/) {
2089: $thisallowed.=$1;
2090: }
2091:
2092: # Course: uri itself is a course
2093: my $courseuri=$uri;
2094: $courseuri=~s/\_(\d)/\/$1/;
2095: $courseuri=~s/^([^\/])/\/$1/;
2096:
2097: if ($ENV{'user.priv.'.$ENV{'request.role'}.'.'.$courseuri}
2098: =~/$priv\&([^\:]*)/) {
2099: $thisallowed.=$1;
2100: }
2101:
2102: # URI is an uploaded document for this course
2103:
2104: if (($priv eq 'bre') &&
2105: ($uri=~/^uploaded\/$ENV{'course.'.$ENV{'request.course.id'}.'.domain'}\/$ENV{'course.'.$ENV{'request.course.id'}.'.num'}/)) {
2106: return 'F';
2107: }
2108: # Full access at system, domain or course-wide level? Exit.
2109:
2110: if ($thisallowed=~/F/) {
2111: return 'F';
2112: }
2113:
2114: # If this is generating or modifying users, exit with special codes
2115:
2116: if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:cca:'=~/\:$priv\:/) {
2117: return $thisallowed;
2118: }
2119: #
2120: # Gathered so far: system, domain and course wide privileges
2121: #
2122: # Course: See if uri or referer is an individual resource that is part of
2123: # the course
2124:
2125: if ($ENV{'request.course.id'}) {
2126:
2127: $courseprivid=$ENV{'request.course.id'};
2128: if ($ENV{'request.course.sec'}) {
2129: $courseprivid.='/'.$ENV{'request.course.sec'};
2130: }
2131: $courseprivid=~s/\_/\//;
2132: my $checkreferer=1;
2133: my ($match,$cond)=&is_on_map($uri);
2134: if ($match) {
2135: $statecond=$cond;
2136: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
2137: =~/$priv\&([^\:]*)/) {
2138: $thisallowed.=$1;
2139: $checkreferer=0;
2140: }
2141: }
2142:
2143: if ($checkreferer) {
2144: my $refuri=$ENV{'httpref.'.$orguri};
2145: unless ($refuri) {
2146: foreach (keys %ENV) {
2147: if ($_=~/^httpref\..*\*/) {
2148: my $pattern=$_;
2149: $pattern=~s/^httpref\.\/res\///;
2150: $pattern=~s/\*/\[\^\/\]\+/g;
2151: $pattern=~s/\//\\\//g;
2152: if ($orguri=~/$pattern/) {
2153: $refuri=$ENV{$_};
2154: }
2155: }
2156: }
2157: }
2158:
2159: if ($refuri) {
2160: $refuri=&declutter($refuri);
2161: my ($match,$cond)=&is_on_map($refuri);
2162: if ($match) {
2163: my $refstatecond=$cond;
2164: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
2165: =~/$priv\&([^\:]*)/) {
2166: $thisallowed.=$1;
2167: $uri=$refuri;
2168: $statecond=$refstatecond;
2169: }
2170: }
2171: }
2172: }
2173: }
2174:
2175: #
2176: # Gathered now: all privileges that could apply, and condition number
2177: #
2178: #
2179: # Full or no access?
2180: #
2181:
2182: if ($thisallowed=~/F/) {
2183: return 'F';
2184: }
2185:
2186: unless ($thisallowed) {
2187: return '';
2188: }
2189:
2190: # Restrictions exist, deal with them
2191: #
2192: # C:according to course preferences
2193: # R:according to resource settings
2194: # L:unless locked
2195: # X:according to user session state
2196: #
2197:
2198: # Possibly locked functionality, check all courses
2199: # Locks might take effect only after 10 minutes cache expiration for other
2200: # courses, and 2 minutes for current course
2201:
2202: my $envkey;
2203: if ($thisallowed=~/L/) {
2204: foreach $envkey (keys %ENV) {
2205: if ($envkey=~/^user\.role\.(st|ta)\.([^\.]*)/) {
2206: my $courseid=$2;
2207: my $roleid=$1.'.'.$2;
2208: $courseid=~s/^\///;
2209: my $expiretime=600;
2210: if ($ENV{'request.role'} eq $roleid) {
2211: $expiretime=120;
2212: }
2213: my ($cdom,$cnum,$csec)=split(/\//,$courseid);
2214: my $prefix='course.'.$cdom.'_'.$cnum.'.';
2215: if ((time-$ENV{$prefix.'last_cache'})>$expiretime) {
2216: &coursedescription($courseid);
2217: }
2218: if (($ENV{$prefix.'res.'.$uri.'.lock.sections'}=~/\,$csec\,/)
2219: || ($ENV{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {
2220: if ($ENV{$prefix.'res.'.$uri.'.lock.expire'}>time) {
2221: &log($ENV{'user.domain'},$ENV{'user.name'},
2222: $ENV{'user.home'},
2223: 'Locked by res: '.$priv.' for '.$uri.' due to '.
2224: $cdom.'/'.$cnum.'/'.$csec.' expire '.
2225: $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
2226: return '';
2227: }
2228: }
2229: if (($ENV{$prefix.'priv.'.$priv.'.lock.sections'}=~/\,$csec\,/)
2230: || ($ENV{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {
2231: if ($ENV{'priv.'.$priv.'.lock.expire'}>time) {
2232: &log($ENV{'user.domain'},$ENV{'user.name'},
2233: $ENV{'user.home'},
2234: 'Locked by priv: '.$priv.' for '.$uri.' due to '.
2235: $cdom.'/'.$cnum.'/'.$csec.' expire '.
2236: $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
2237: return '';
2238: }
2239: }
2240: }
2241: }
2242: }
2243:
2244: #
2245: # Rest of the restrictions depend on selected course
2246: #
2247:
2248: unless ($ENV{'request.course.id'}) {
2249: return '1';
2250: }
2251:
2252: #
2253: # Now user is definitely in a course
2254: #
2255:
2256:
2257: # Course preferences
2258:
2259: if ($thisallowed=~/C/) {
2260: my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
2261: my $unamedom=$ENV{'user.name'}.':'.$ENV{'user.domain'};
2262: if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.roles.denied'}
2263: =~/$rolecode/) {
2264: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
2265: 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.
2266: $ENV{'request.course.id'});
2267: return '';
2268: }
2269:
2270: if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.users.denied'}
2271: =~/$unamedom/) {
2272: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
2273: 'Denied by user: '.$priv.' for '.$uri.' as '.$unamedom.' in '.
2274: $ENV{'request.course.id'});
2275: return '';
2276: }
2277: }
2278:
2279: # Resource preferences
2280:
2281: if ($thisallowed=~/R/) {
2282: my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
2283: if (&metadata($uri,'roledeny')=~/$rolecode/) {
2284: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
2285: 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);
2286: return '';
2287: }
2288: }
2289:
2290: # Restricted by state or randomout?
2291:
2292: if ($thisallowed=~/X/) {
2293: if ($ENV{'acc.randomout'}) {
2294: my $symb=&symbread($uri,1);
2295: if (($symb) && ($ENV{'acc.randomout'}=~/\&$symb\&/)) {
2296: return '';
2297: }
2298: }
2299: if (&condval($statecond)) {
2300: return '2';
2301: } else {
2302: return '';
2303: }
2304: }
2305:
2306: return 'F';
2307: }
2308:
2309: # --------------------------------------------------- Is a resource on the map?
2310:
2311: sub is_on_map {
2312: my $uri=&declutter(shift);
2313: my @uriparts=split(/\//,$uri);
2314: my $filename=$uriparts[$#uriparts];
2315: my $pathname=$uri;
2316: $pathname=~s|/\Q$filename\E$||;
2317: $pathname=~s/^adm\/wrapper\///;
2318: #Trying to find the conditional for the file
2319: my $match=($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
2320: /\&\Q$filename\E\:([\d\|]+)\&/);
2321: if ($match) {
2322: return (1,$1);
2323: } else {
2324: return (0,0);
2325: }
2326: }
2327:
2328: # ----------------------------------------------------------------- Define Role
2329:
2330: sub definerole {
2331: if (allowed('mcr','/')) {
2332: my ($rolename,$sysrole,$domrole,$courole)=@_;
2333: foreach (split('/',$sysrole)) {
2334: my ($crole,$cqual)=split(/\&/,$_);
2335: if ($pr{'cr:s'}!~/$crole/) { return "refused:s:$crole"; }
2336: if ($pr{'cr:s'}=~/$crole\&/) {
2337: if ($pr{'cr:s'}!~/$crole\&\w*$cqual/) {
2338: return "refused:s:$crole&$cqual";
2339: }
2340: }
2341: }
2342: foreach (split('/',$domrole)) {
2343: my ($crole,$cqual)=split(/\&/,$_);
2344: if ($pr{'cr:d'}!~/$crole/) { return "refused:d:$crole"; }
2345: if ($pr{'cr:d'}=~/$crole\&/) {
2346: if ($pr{'cr:d'}!~/$crole\&\w*$cqual/) {
2347: return "refused:d:$crole&$cqual";
2348: }
2349: }
2350: }
2351: foreach (split('/',$courole)) {
2352: my ($crole,$cqual)=split(/\&/,$_);
2353: if ($pr{'cr:c'}!~/$crole/) { return "refused:c:$crole"; }
2354: if ($pr{'cr:c'}=~/$crole\&/) {
2355: if ($pr{'cr:c'}!~/$crole\&\w*$cqual/) {
2356: return "refused:c:$crole&$cqual";
2357: }
2358: }
2359: }
2360: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
2361: "$ENV{'user.domain'}:$ENV{'user.name'}:".
2362: "rolesdef_$rolename=".
2363: escape($sysrole.'_'.$domrole.'_'.$courole);
2364: return reply($command,$ENV{'user.home'});
2365: } else {
2366: return 'refused';
2367: }
2368: }
2369:
2370: # ---------------- Make a metadata query against the network of library servers
2371:
2372: sub metadata_query {
2373: my ($query,$custom,$customshow,$server_array)=@_;
2374: my %rhash;
2375: my @server_list = (defined($server_array) ? @$server_array
2376: : keys(%libserv) );
2377: for my $server (@server_list) {
2378: unless ($custom or $customshow) {
2379: my $reply=&reply("querysend:".&escape($query),$server);
2380: $rhash{$server}=$reply;
2381: }
2382: else {
2383: my $reply=&reply("querysend:".&escape($query).':'.
2384: &escape($custom).':'.&escape($customshow),
2385: $server);
2386: $rhash{$server}=$reply;
2387: }
2388: }
2389: return \%rhash;
2390: }
2391:
2392: # ----------------------------------------- Send log queries and wait for reply
2393:
2394: sub log_query {
2395: my ($uname,$udom,$query,%filters)=@_;
2396: my $uhome=&homeserver($uname,$udom);
2397: if ($uhome eq 'no_host') { return 'error: no_host'; }
2398: my $uhost=$hostname{$uhome};
2399: my $command=&escape(join(':',map{$_.'='.$filters{$_}} keys %filters));
2400: my $queryid=&reply("querysend:".$query.':'.$udom.':'.$uname.':'.$command,
2401: $uhome);
2402: unless ($queryid=~/^$uhost\_/) { return 'error: '.$queryid; }
2403: return get_query_reply($queryid);
2404: }
2405:
2406: sub get_query_reply {
2407: my $queryid=shift;
2408: my $replyfile=$perlvar{'lonDaemons'}.'/tmp/'.$queryid;
2409: my $reply='';
2410: for (1..100) {
2411: sleep 2;
2412: if (-e $replyfile.'.end') {
2413: if (my $fh=Apache::File->new($replyfile)) {
2414: $reply.=<$fh>;
2415: $fh->close;
2416: } else { return 'error: reply_file_error'; }
2417: return &unescape($reply);
2418: }
2419: }
2420: return 'timeout:'.$queryid;
2421: }
2422:
2423: sub courselog_query {
2424: #
2425: # possible filters:
2426: # url: url or symb
2427: # username
2428: # domain
2429: # action: view, submit, grade
2430: # start: timestamp
2431: # end: timestamp
2432: #
2433: my (%filters)=@_;
2434: unless ($ENV{'request.course.id'}) { return 'no_course'; }
2435: if ($filters{'url'}) {
2436: $filters{'url'}=&symbclean(&declutter($filters{'url'}));
2437: $filters{'url'}=~s/\.(\w+)$/(\\.\\d+)*\\.$1/;
2438: $filters{'url'}=~s/\.(\w+)\_\_\_/(\\.\\d+)*\\.$1/;
2439: }
2440: my $cname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
2441: my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
2442: return &log_query($cname,$cdom,'courselog',%filters);
2443: }
2444:
2445: sub userlog_query {
2446: my ($uname,$udom,%filters)=@_;
2447: return &log_query($uname,$udom,'userlog',%filters);
2448: }
2449:
2450: # ------------------------------------------------------------------ Plain Text
2451:
2452: sub plaintext {
2453: my $short=shift;
2454: return $prp{$short};
2455: }
2456:
2457: # ----------------------------------------------------------------- Assign Role
2458:
2459: sub assignrole {
2460: my ($udom,$uname,$url,$role,$end,$start)=@_;
2461: my $mrole;
2462: if ($role =~ /^cr\//) {
2463: unless (&allowed('ccr',$url)) {
2464: &logthis('Refused custom assignrole: '.
2465: $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
2466: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
2467: return 'refused';
2468: }
2469: $mrole='cr';
2470: } else {
2471: my $cwosec=$url;
2472: $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
2473: unless (&allowed('c'.$role,$cwosec)) {
2474: &logthis('Refused assignrole: '.
2475: $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
2476: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
2477: return 'refused';
2478: }
2479: $mrole=$role;
2480: }
2481: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
2482: "$udom:$uname:$url".'_'."$mrole=$role";
2483: if ($end) { $command.='_'.$end; }
2484: if ($start) {
2485: if ($end) {
2486: $command.='_'.$start;
2487: } else {
2488: $command.='_0_'.$start;
2489: }
2490: }
2491: my $answer=&reply($command,&homeserver($uname,$udom));
2492: if ($answer eq 'ok') {
2493: &userrolelog($mrole,$uname,$udom,$url,$start,$end);
2494: }
2495: return $answer;
2496: }
2497:
2498: # -------------------------------------------------- Modify user authentication
2499: # Overrides without validation
2500:
2501: sub modifyuserauth {
2502: my ($udom,$uname,$umode,$upass)=@_;
2503: my $uhome=&homeserver($uname,$udom);
2504: unless (&allowed('mau',$udom)) { return 'refused'; }
2505: &logthis('Call to modify user authentication '.$udom.', '.$uname.', '.
2506: $umode.' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'}.
2507: ' in domain '.$ENV{'request.role.domain'});
2508: my $reply=&reply('encrypt:changeuserauth:'.$udom.':'.$uname.':'.$umode.':'.
2509: &escape($upass),$uhome);
2510: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},
2511: 'Authentication changed for '.$udom.', '.$uname.', '.$umode.
2512: '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
2513: &log($udom,,$uname,$uhome,
2514: 'Authentication changed by '.$ENV{'user.domain'}.', '.
2515: $ENV{'user.name'}.', '.$umode.
2516: '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
2517: unless ($reply eq 'ok') {
2518: &logthis('Authentication mode error: '.$reply);
2519: return 'error: '.$reply;
2520: }
2521: return 'ok';
2522: }
2523:
2524: # --------------------------------------------------------------- Modify a user
2525:
2526: sub modifyuser {
2527: my ($udom, $uname, $uid,
2528: $umode, $upass, $first,
2529: $middle, $last, $gene,
2530: $forceid, $desiredhome)=@_;
2531: $udom=~s/\W//g;
2532: $uname=~s/\W//g;
2533: &logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.
2534: $umode.', '.$first.', '.$middle.', '.
2535: $last.', '.$gene.'(forceid: '.$forceid.')'.
2536: (defined($desiredhome) ? ' desiredhome = '.$desiredhome :
2537: ' desiredhome not specified').
2538: ' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'}.
2539: ' in domain '.$ENV{'request.role.domain'});
2540: my $uhome=&homeserver($uname,$udom,'true');
2541: # ----------------------------------------------------------------- Create User
2542: if (($uhome eq 'no_host') && ($umode) && ($upass)) {
2543: my $unhome='';
2544: if (defined($desiredhome) && $hostdom{$desiredhome} eq $udom) {
2545: $unhome = $desiredhome;
2546: } elsif($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $udom) {
2547: $unhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
2548: } else { # load balancing routine for determining $unhome
2549: my $tryserver;
2550: my $loadm=10000000;
2551: foreach $tryserver (keys %libserv) {
2552: if ($hostdom{$tryserver} eq $udom) {
2553: my $answer=reply('load',$tryserver);
2554: if (($answer=~/\d+/) && ($answer<$loadm)) {
2555: $loadm=$answer;
2556: $unhome=$tryserver;
2557: }
2558: }
2559: }
2560: }
2561: if (($unhome eq '') || ($unhome eq 'no_host')) {
2562: return 'error: unable to find a home server for '.$uname.
2563: ' in domain '.$udom;
2564: }
2565: my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':'.$umode.':'.
2566: &escape($upass),$unhome);
2567: unless ($reply eq 'ok') {
2568: return 'error: '.$reply;
2569: }
2570: $uhome=&homeserver($uname,$udom,'true');
2571: if (($uhome eq '') || ($uhome eq 'no_host') || ($uhome ne $unhome)) {
2572: return 'error: verify home';
2573: }
2574: } # End of creation of new user
2575: # ---------------------------------------------------------------------- Add ID
2576: if ($uid) {
2577: $uid=~tr/A-Z/a-z/;
2578: my %uidhash=&idrget($udom,$uname);
2579: if (($uidhash{$uname}) && ($uidhash{$uname}!~/error\:/)
2580: && (!$forceid)) {
2581: unless ($uid eq $uidhash{$uname}) {
2582: return 'error: mismatch '.$uidhash{$uname}.' versus '.$uid;
2583: }
2584: } else {
2585: &idput($udom,($uname => $uid));
2586: }
2587: }
2588: # -------------------------------------------------------------- Add names, etc
2589: my @tmp=&get('environment',
2590: ['firstname','middlename','lastname','generation'],
2591: $udom,$uname);
2592: my %names;
2593: if ($tmp[0] =~ m/^error:.*/) {
2594: %names=();
2595: } else {
2596: %names = @tmp;
2597: }
2598: if ($first) { $names{'firstname'} = $first; }
2599: if ($middle) { $names{'middlename'} = $middle; }
2600: if ($last) { $names{'lastname'} = $last; }
2601: if ($gene) { $names{'generation'} = $gene; }
2602: my $reply = &put('environment', \%names, $udom,$uname);
2603: if ($reply ne 'ok') { return 'error: '.$reply; }
2604: &logthis('Success modifying user '.$udom.', '.$uname.', '.$uid.', '.
2605: $umode.', '.$first.', '.$middle.', '.
2606: $last.', '.$gene.' by '.
2607: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
2608: return 'ok';
2609: }
2610:
2611: # -------------------------------------------------------------- Modify student
2612:
2613: sub modifystudent {
2614: my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,
2615: $end,$start,$forceid,$desiredhome)=@_;
2616: my $cid='';
2617: unless ($cid=$ENV{'request.course.id'}) {
2618: return 'not_in_class';
2619: }
2620: # --------------------------------------------------------------- Make the user
2621: my $reply=&modifyuser
2622: ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$forceid,
2623: $desiredhome);
2624: unless ($reply eq 'ok') { return $reply; }
2625: # This will cause &modify_student_enrollment to get the uid from the
2626: # students environment
2627: $uid = undef if (!$forceid);
2628: $reply = &modify_student_enrollment($udom,$uname,$uid,$first,$middle,
2629: $last,$gene,$usec,$end,$start);
2630: return $reply;
2631: }
2632:
2633: sub modify_student_enrollment {
2634: my ($udom,$uname,$uid,$first,$middle,$last,$gene,$usec,$end,$start) = @_;
2635: # Get the course id from the environment
2636: my $cid='';
2637: unless ($cid=$ENV{'request.course.id'}) {
2638: return 'not_in_class';
2639: }
2640: # Make sure the user exists
2641: my $uhome=&homeserver($uname,$udom);
2642: if (($uhome eq '') || ($uhome eq 'no_host')) {
2643: return 'error: no such user';
2644: }
2645: #
2646: # Get student data if we were not given enough information
2647: if (!defined($first) || $first eq '' ||
2648: !defined($last) || $last eq '' ||
2649: !defined($uid) || $uid eq '' ||
2650: !defined($middle) || $middle eq '' ||
2651: !defined($gene) || $gene eq '') {
2652: # They did not supply us with enough data to enroll the student, so
2653: # we need to pick up more information.
2654: my %tmp = &get('environment',
2655: ['firstname','middlename','lastname', 'generation','id']
2656: ,$udom,$uname);
2657:
2658: foreach (keys(%tmp)) {
2659: &logthis("key $_ = ".$tmp{$_});
2660: }
2661: $first = $tmp{'firstname'} if (!defined($first) || $first eq '');
2662: $middle = $tmp{'middlename'} if (!defined($middle) || $middle eq '');
2663: $last = $tmp{'lastname'} if (!defined($last) || $last eq '');
2664: $gene = $tmp{'generation'} if (!defined($gene) || $gene eq '');
2665: $uid = $tmp{'id'} if (!defined($uid) || $uid eq '');
2666: }
2667: my $fullname = &Apache::loncoursedata::ProcessFullName($last,$gene,
2668: $first,$middle);
2669: my $reply=critical('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
2670: $ENV{'course.'.$cid.'.num'}.':classlist:'.
2671: &escape($uname.':'.$udom).'='.
2672: &escape(join(':',$end,$start,$uid,$usec,$fullname)),
2673: $ENV{'course.'.$cid.'.home'});
2674: unless (($reply eq 'ok') || ($reply eq 'delayed')) {
2675: return 'error: '.$reply;
2676: }
2677: # Add student role to user
2678: my $uurl='/'.$cid;
2679: $uurl=~s/\_/\//g;
2680: if ($usec) {
2681: $uurl.='/'.$usec;
2682: }
2683: return &assignrole($udom,$uname,$uurl,'st',$end,$start);
2684: }
2685:
2686: # ------------------------------------------------- Write to course preferences
2687:
2688: sub writecoursepref {
2689: my ($courseid,%prefs)=@_;
2690: $courseid=~s/^\///;
2691: $courseid=~s/\_/\//g;
2692: my ($cdomain,$cnum)=split(/\//,$courseid);
2693: my $chome=homeserver($cnum,$cdomain);
2694: if (($chome eq '') || ($chome eq 'no_host')) {
2695: return 'error: no such course';
2696: }
2697: my $cstring='';
2698: foreach (keys %prefs) {
2699: $cstring.=escape($_).'='.escape($prefs{$_}).'&';
2700: }
2701: $cstring=~s/\&$//;
2702: return reply('put:'.$cdomain.':'.$cnum.':environment:'.$cstring,$chome);
2703: }
2704:
2705: # ---------------------------------------------------------- Make/modify course
2706:
2707: sub createcourse {
2708: my ($udom,$description,$url,$course_server,$nonstandard)=@_;
2709: $url=&declutter($url);
2710: my $cid='';
2711: unless (&allowed('ccc',$udom)) {
2712: return 'refused';
2713: }
2714: # ------------------------------------------------------------------- Create ID
2715: my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
2716: unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
2717: # ----------------------------------------------- Make sure that does not exist
2718: my $uhome=&homeserver($uname,$udom,'true');
2719: unless (($uhome eq '') || ($uhome eq 'no_host')) {
2720: $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
2721: unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
2722: $uhome=&homeserver($uname,$udom,'true');
2723: unless (($uhome eq '') || ($uhome eq 'no_host')) {
2724: return 'error: unable to generate unique course-ID';
2725: }
2726: }
2727: # ------------------------------------------------ Check supplied server name
2728: $course_server = $ENV{'user.homeserver'} if (! defined($course_server));
2729: if (! exists($libserv{$course_server})) {
2730: return 'error:bad server name '.$course_server;
2731: }
2732: # ------------------------------------------------------------- Make the course
2733: my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
2734: $course_server);
2735: unless ($reply eq 'ok') { return 'error: '.$reply; }
2736: $uhome=&homeserver($uname,$udom,'true');
2737: if (($uhome eq '') || ($uhome eq 'no_host')) {
2738: return 'error: no such course';
2739: }
2740: # ----------------------------------------------------------------- Course made
2741: my $topurl=$url;
2742: unless ($nonstandard) {
2743: # ------------------------------------------ For standard courses, make top url
2744: my $mapurl=&clutter($url);
2745: if ($mapurl eq '/res/') { $mapurl=''; }
2746: $ENV{'form.initmap'}=(<<ENDINITMAP);
2747: <map>
2748: <resource id="1" type="start"></resource>
2749: <resource id="2" src="$mapurl"></resource>
2750: <resource id="3" type="finish"></resource>
2751: <link index="1" from="1" to="2"></link>
2752: <link index="2" from="2" to="3"></link>
2753: </map>
2754: ENDINITMAP
2755: $topurl=&declutter(
2756: &finishuserfileupload($uname,$udom,$uhome,'initmap','default.sequence')
2757: );
2758: }
2759: # ----------------------------------------------------------- Write preferences
2760: &writecoursepref($udom.'_'.$uname,
2761: ('description' => $description,
2762: 'url' => $topurl));
2763: return '/'.$udom.'/'.$uname;
2764: }
2765:
2766: # ---------------------------------------------------------- Assign Custom Role
2767:
2768: sub assigncustomrole {
2769: my ($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start)=@_;
2770: return &assignrole($udom,$uname,$url,'cr/'.$rdom.'/'.$rnam.'/'.$rolename,
2771: $end,$start);
2772: }
2773:
2774: # ----------------------------------------------------------------- Revoke Role
2775:
2776: sub revokerole {
2777: my ($udom,$uname,$url,$role)=@_;
2778: my $now=time;
2779: return &assignrole($udom,$uname,$url,$role,$now);
2780: }
2781:
2782: # ---------------------------------------------------------- Revoke Custom Role
2783:
2784: sub revokecustomrole {
2785: my ($udom,$uname,$url,$rdom,$rnam,$rolename)=@_;
2786: my $now=time;
2787: return &assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$now);
2788: }
2789:
2790: # ------------------------------------------------------------ Directory lister
2791:
2792: sub dirlist {
2793: my ($uri,$userdomain,$username,$alternateDirectoryRoot)=@_;
2794:
2795: $uri=~s/^\///;
2796: $uri=~s/\/$//;
2797: my ($udom, $uname);
2798: (undef,$udom,$uname)=split(/\//,$uri);
2799: if(defined($userdomain)) {
2800: $udom = $userdomain;
2801: }
2802: if(defined($username)) {
2803: $uname = $username;
2804: }
2805:
2806: my $dirRoot = $perlvar{'lonDocRoot'};
2807: if(defined($alternateDirectoryRoot)) {
2808: $dirRoot = $alternateDirectoryRoot;
2809: $dirRoot =~ s/\/$//;
2810: }
2811:
2812: if($udom) {
2813: if($uname) {
2814: my $listing=reply('ls:'.$dirRoot.'/'.$uri,
2815: homeserver($uname,$udom));
2816: return split(/:/,$listing);
2817: } elsif(!defined($alternateDirectoryRoot)) {
2818: my $tryserver;
2819: my %allusers=();
2820: foreach $tryserver (keys %libserv) {
2821: if($hostdom{$tryserver} eq $udom) {
2822: my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.
2823: $udom, $tryserver);
2824: if (($listing ne 'no_such_dir') && ($listing ne 'empty')
2825: && ($listing ne 'con_lost')) {
2826: foreach (split(/:/,$listing)) {
2827: my ($entry,@stat)=split(/&/,$_);
2828: $allusers{$entry}=1;
2829: }
2830: }
2831: }
2832: }
2833: my $alluserstr='';
2834: foreach (sort keys %allusers) {
2835: $alluserstr.=$_.'&user:';
2836: }
2837: $alluserstr=~s/:$//;
2838: return split(/:/,$alluserstr);
2839: } else {
2840: my @emptyResults = ();
2841: push(@emptyResults, 'missing user name');
2842: return split(':',@emptyResults);
2843: }
2844: } elsif(!defined($alternateDirectoryRoot)) {
2845: my $tryserver;
2846: my %alldom=();
2847: foreach $tryserver (keys %libserv) {
2848: $alldom{$hostdom{$tryserver}}=1;
2849: }
2850: my $alldomstr='';
2851: foreach (sort keys %alldom) {
2852: $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
2853: }
2854: $alldomstr=~s/:$//;
2855: return split(/:/,$alldomstr);
2856: } else {
2857: my @emptyResults = ();
2858: push(@emptyResults, 'missing domain');
2859: return split(':',@emptyResults);
2860: }
2861: }
2862:
2863: # --------------------------------------------- GetFileTimestamp
2864: # This function utilizes dirlist and returns the date stamp for
2865: # when it was last modified. It will also return an error of -1
2866: # if an error occurs
2867:
2868: sub GetFileTimestamp {
2869: my ($studentDomain,$studentName,$filename,$root)=@_;
2870: $studentDomain=~s/\W//g;
2871: $studentName=~s/\W//g;
2872: my $subdir=$studentName.'__';
2873: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
2874: my $proname="$studentDomain/$subdir/$studentName";
2875: $proname .= '/'.$filename;
2876: my @dir = &Apache::lonnet::dirlist($proname, $studentDomain, $studentName,
2877: $root);
2878: my $fileStat = $dir[0];
2879: my @stats = split('&', $fileStat);
2880: if($stats[0] ne 'empty' && $stats[0] ne 'no_such_dir') {
2881: return $stats[9];
2882: } else {
2883: return -1;
2884: }
2885: }
2886:
2887: # -------------------------------------------------------- Value of a Condition
2888:
2889: sub directcondval {
2890: my $number=shift;
2891: if ($ENV{'user.state.'.$ENV{'request.course.id'}}) {
2892: return substr($ENV{'user.state.'.$ENV{'request.course.id'}},$number,1);
2893: } else {
2894: return 2;
2895: }
2896: }
2897:
2898: sub condval {
2899: my $condidx=shift;
2900: my $result=0;
2901: my $allpathcond='';
2902: foreach (split(/\|/,$condidx)) {
2903: if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_})) {
2904: $allpathcond.=
2905: '('.$ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_}.')|';
2906: }
2907: }
2908: $allpathcond=~s/\|$//;
2909: if ($ENV{'request.course.id'}) {
2910: if ($allpathcond) {
2911: my $operand='|';
2912: my @stack;
2913: foreach ($allpathcond=~/(\d+|\(|\)|\&|\|)/g) {
2914: if ($_ eq '(') {
2915: push @stack,($operand,$result)
2916: } elsif ($_ eq ')') {
2917: my $before=pop @stack;
2918: if (pop @stack eq '&') {
2919: $result=$result>$before?$before:$result;
2920: } else {
2921: $result=$result>$before?$result:$before;
2922: }
2923: } elsif (($_ eq '&') || ($_ eq '|')) {
2924: $operand=$_;
2925: } else {
2926: my $new=directcondval($_);
2927: if ($operand eq '&') {
2928: $result=$result>$new?$new:$result;
2929: } else {
2930: $result=$result>$new?$result:$new;
2931: }
2932: }
2933: }
2934: }
2935: }
2936: return $result;
2937: }
2938:
2939: # ---------------------------------------------------- Devalidate courseresdata
2940:
2941: sub devalidatecourseresdata {
2942: my ($coursenum,$coursedomain)=@_;
2943: my $hashid=$coursenum.':'.$coursedomain;
2944: delete $courseresdatacache{$hashid.'.time'};
2945: }
2946:
2947: # --------------------------------------------------- Course Resourcedata Query
2948:
2949: sub courseresdata {
2950: my ($coursenum,$coursedomain,@which)=@_;
2951: my $coursehom=&homeserver($coursenum,$coursedomain);
2952: my $hashid=$coursenum.':'.$coursedomain;
2953: my $dodump=0;
2954: if (!defined($courseresdatacache{$hashid.'.time'})) {
2955: $dodump=1;
2956: } else {
2957: if (time-$courseresdatacache{$hashid.'.time'}>300) { $dodump=1; }
2958: }
2959: if ($dodump) {
2960: my %dumpreply=&dump('resourcedata',$coursedomain,$coursenum);
2961: my ($tmp) = keys(%dumpreply);
2962: if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
2963: $courseresdatacache{$hashid.'.time'}=time;
2964: $courseresdatacache{$hashid}=\%dumpreply;
2965: } elsif ($tmp =~ /^(con_lost|no_such_host)/) {
2966: return $tmp;
2967: }
2968: }
2969: foreach my $item (@which) {
2970: if (defined($courseresdatacache{$hashid}->{$item})) {
2971: return $courseresdatacache{$hashid}->{$item};
2972: }
2973: }
2974: return undef;
2975: }
2976:
2977: # --------------------------------------------------------- Value of a Variable
2978:
2979: sub EXT {
2980: my ($varname,$symbparm,$udom,$uname,)=@_;
2981:
2982: unless ($varname) { return ''; }
2983: #get real user name/domain, courseid and symb
2984: my $courseid;
2985: if (!($uname && $udom)) {
2986: (my $cursymb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
2987: if (!$symbparm) { $symbparm=$cursymb; }
2988: } else {
2989: $courseid=$ENV{'request.course.id'};
2990: }
2991: my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
2992: my $rest;
2993: if (defined($therest[0])) {
2994: $rest=join('.',@therest);
2995: } else {
2996: $rest='';
2997: }
2998:
2999: my $qualifierrest=$qualifier;
3000: if ($rest) { $qualifierrest.='.'.$rest; }
3001: my $spacequalifierrest=$space;
3002: if ($qualifierrest) { $spacequalifierrest.='.'.$qualifierrest; }
3003: if ($realm eq 'user') {
3004: # --------------------------------------------------------------- user.resource
3005: if ($space eq 'resource') {
3006: if (defined($Apache::lonhomework::parsing_a_problem)) {
3007: return $Apache::lonhomework::history{$qualifierrest};
3008: } else {
3009: my %restored=&restore($symbparm,$courseid,$udom,$uname);
3010: return $restored{$qualifierrest};
3011: }
3012: # ----------------------------------------------------------------- user.access
3013: } elsif ($space eq 'access') {
3014: # FIXME - not supporting calls for a specific user
3015: return &allowed($qualifier,$rest);
3016: # ------------------------------------------ user.preferences, user.environment
3017: } elsif (($space eq 'preferences') || ($space eq 'environment')) {
3018: if (($uname eq $ENV{'user.name'}) &&
3019: ($udom eq $ENV{'user.domain'})) {
3020: return $ENV{join('.',('environment',$qualifierrest))};
3021: } else {
3022: my %returnhash=&userenvironment($udom,$uname,$qualifierrest);
3023: return $returnhash{$qualifierrest};
3024: }
3025: # ----------------------------------------------------------------- user.course
3026: } elsif ($space eq 'course') {
3027: # FIXME - not supporting calls for a specific user
3028: return $ENV{join('.',('request.course',$qualifier))};
3029: # ------------------------------------------------------------------- user.role
3030: } elsif ($space eq 'role') {
3031: # FIXME - not supporting calls for a specific user
3032: my ($role,$where)=split(/\./,$ENV{'request.role'});
3033: if ($qualifier eq 'value') {
3034: return $role;
3035: } elsif ($qualifier eq 'extent') {
3036: return $where;
3037: }
3038: # ----------------------------------------------------------------- user.domain
3039: } elsif ($space eq 'domain') {
3040: return $udom;
3041: # ------------------------------------------------------------------- user.name
3042: } elsif ($space eq 'name') {
3043: return $uname;
3044: # ---------------------------------------------------- Any other user namespace
3045: } else {
3046: my %reply=&get($space,[$qualifierrest],$udom,$uname);
3047: return $reply{$qualifierrest};
3048: }
3049: } elsif ($realm eq 'query') {
3050: # ---------------------------------------------- pull stuff out of query string
3051: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},[$space]);
3052: return $ENV{'form.'.$space};
3053: } elsif ($realm eq 'request') {
3054: # ------------------------------------------------------------- request.browser
3055: if ($space eq 'browser') {
3056: return $ENV{'browser.'.$qualifier};
3057: # ------------------------------------------------------------ request.filename
3058: } else {
3059: return $ENV{'request.'.$spacequalifierrest};
3060: }
3061: } elsif ($realm eq 'course') {
3062: # ---------------------------------------------------------- course.description
3063: return $ENV{'course.'.$courseid.'.'.$spacequalifierrest};
3064: } elsif ($realm eq 'resource') {
3065:
3066: if ($courseid eq $ENV{'request.course.id'}) {
3067:
3068: #print '<br>'.$space.' - '.$qualifier.' - '.$spacequalifierrest;
3069:
3070: # ----------------------------------------------------- Cascading lookup scheme
3071: if (!$symbparm) { $symbparm=&symbread(); }
3072: my $symbp=$symbparm;
3073: my $mapp=(split(/\_\_\_/,$symbp))[0];
3074:
3075: my $symbparm=$symbp.'.'.$spacequalifierrest;
3076: my $mapparm=$mapp.'___(all).'.$spacequalifierrest;
3077:
3078: my $section;
3079: if (($ENV{'user.name'} eq $uname) &&
3080: ($ENV{'user.domain'} eq $udom)) {
3081: $section=$ENV{'request.course.sec'};
3082: } else {
3083: $section=&usection($udom,$uname,$courseid);
3084: }
3085:
3086: my $seclevel=$courseid.'.['.$section.'].'.$spacequalifierrest;
3087: my $seclevelr=$courseid.'.['.$section.'].'.$symbparm;
3088: my $seclevelm=$courseid.'.['.$section.'].'.$mapparm;
3089:
3090: my $courselevel=$courseid.'.'.$spacequalifierrest;
3091: my $courselevelr=$courseid.'.'.$symbparm;
3092: my $courselevelm=$courseid.'.'.$mapparm;
3093:
3094: # ----------------------------------------------------------- first, check user
3095: #most student don't have any data set, check if there is some data
3096: #every thirty minutes
3097: if (!
3098: (exists($ENV{'cache.studentresdata'})
3099: && (($ENV{'cache.studentresdata'}+1800) > time))) {
3100: my %resourcedata=&get('resourcedata',
3101: [$courselevelr,$courselevelm,$courselevel],
3102: $udom,$uname);
3103: my ($tmp)=keys(%resourcedata);
3104: if (($tmp!~/^error\:/) && ($tmp!~/^con_lost/)) {
3105: if ($resourcedata{$courselevelr}) {
3106: return $resourcedata{$courselevelr}; }
3107: if ($resourcedata{$courselevelm}) {
3108: return $resourcedata{$courselevelm}; }
3109: if ($resourcedata{$courselevel}) {
3110: return $resourcedata{$courselevel}; }
3111: } else {
3112: if ($tmp!~/No such file/) {
3113: &logthis("<font color=blue>WARNING:".
3114: " Trying to get resource data for ".
3115: $uname." at ".$udom.": ".
3116: $tmp."</font>");
3117: } elsif ($tmp=~/error:No such file/) {
3118: $ENV{'cache.studentresdata'}=time;
3119: &appenv(('cache.studentresdata'=>
3120: $ENV{'cache.studentresdata'}));
3121: } elsif ($tmp =~ /^(con_lost|no_such_host)/) {
3122: return $tmp;
3123: }
3124: }
3125: }
3126:
3127: # -------------------------------------------------------- second, check course
3128:
3129: my $coursereply=&courseresdata($ENV{'course.'.$courseid.'.num'},
3130: $ENV{'course.'.$courseid.'.domain'},
3131: ($seclevelr,$seclevelm,$seclevel,
3132: $courselevelr,$courselevelm,
3133: $courselevel));
3134: if (defined($coursereply)) { return $coursereply; }
3135:
3136: # ------------------------------------------------------ third, check map parms
3137: my %parmhash=();
3138: my $thisparm='';
3139: if (tie(%parmhash,'GDBM_File',
3140: $ENV{'request.course.fn'}.'_parms.db',
3141: &GDBM_READER(),0640)) {
3142: $thisparm=$parmhash{$symbparm};
3143: untie(%parmhash);
3144: }
3145: if ($thisparm) { return $thisparm; }
3146: }
3147: # --------------------------------------------- last, look in resource metadata
3148:
3149: $spacequalifierrest=~s/\./\_/;
3150: my $filename;
3151: if (!$symbparm) { $symbparm=&symbread(); }
3152: if ($symbparm) {
3153: $filename=(split(/\_\_\_/,$symbparm))[2];
3154: } else {
3155: $filename=$ENV{'request.filename'};
3156: }
3157: my $metadata=&metadata($filename,$spacequalifierrest);
3158: if (defined($metadata)) { return $metadata; }
3159: $metadata=&metadata($filename,'parameter_'.$spacequalifierrest);
3160: if (defined($metadata)) { return $metadata; }
3161:
3162: # ------------------------------------------------------------------ Cascade up
3163: unless ($space eq '0') {
3164: my @parts=split(/_/,$space);
3165: my $id=pop(@parts);
3166: my $part=join('_',@parts);
3167: if ($part eq '') { $part='0'; }
3168: my $partgeneral=&EXT('resource.'.$part.'.'.$qualifierrest,
3169: $symbparm,$udom,$uname);
3170: if (defined($partgeneral)) { return $partgeneral; }
3171: }
3172:
3173: # ---------------------------------------------------- Any other user namespace
3174: } elsif ($realm eq 'environment') {
3175: # ----------------------------------------------------------------- environment
3176: if (($uname eq $ENV{'user.name'})&&($udom eq $ENV{'user.domain'})) {
3177: return $ENV{'environment.'.$spacequalifierrest};
3178: } else {
3179: my %returnhash=&userenvironment($udom,$uname,
3180: $spacequalifierrest);
3181: return $returnhash{$spacequalifierrest};
3182: }
3183: } elsif ($realm eq 'system') {
3184: # ----------------------------------------------------------------- system.time
3185: if ($space eq 'time') {
3186: return time;
3187: }
3188: }
3189: return '';
3190: }
3191:
3192: sub add_prefix_and_part {
3193: my ($prefix,$part)=@_;
3194: my $keyroot;
3195: if (defined($prefix) && $prefix !~ /^__/) {
3196: # prefix that has a part already
3197: $keyroot=$prefix;
3198: } elsif (defined($prefix)) {
3199: # prefix that is missing a part
3200: if (defined($part)) { $keyroot='_'.$part.substr($prefix,1); }
3201: } else {
3202: # no prefix at all
3203: if (defined($part)) { $keyroot='_'.$part; }
3204: }
3205: return $keyroot;
3206: }
3207:
3208: # ---------------------------------------------------------------- Get metadata
3209:
3210: sub metadata {
3211: my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
3212:
3213: $uri=&declutter($uri);
3214: # if it is a non metadata possible uri return quickly
3215: if (($uri eq '') || (($uri =~ m|^/*adm/|) && ($uri !~ m|^adm/includes|)) ||
3216: ($uri =~ m|/$|) || ($uri =~ m|/.meta$|)) {
3217: return '';
3218: }
3219: my $filename=$uri;
3220: $uri=~s/\.meta$//;
3221: #
3222: # Is the metadata already cached?
3223: # Look at timestamp of caching
3224: # Everything is cached by the main uri, libraries are never directly cached
3225: #
3226: unless (abs($metacache{$uri.':cachedtimestamp'}-time)<600 && !defined($liburi)) {
3227: #
3228: # Is this a recursive call for a library?
3229: #
3230: if ($liburi) {
3231: $liburi=&declutter($liburi);
3232: $filename=$liburi;
3233: }
3234: my %metathesekeys=();
3235: unless ($filename=~/\.meta$/) { $filename.='.meta'; }
3236: my $metastring=&getfile(&filelocation('',&clutter($filename)));
3237: my $parser=HTML::LCParser->new(\$metastring);
3238: my $token;
3239: undef %metathesekeys;
3240: while ($token=$parser->get_token) {
3241: if ($token->[0] eq 'S') {
3242: if (defined($token->[2]->{'package'})) {
3243: #
3244: # This is a package - get package info
3245: #
3246: my $package=$token->[2]->{'package'};
3247: my $keyroot=&add_prefix_and_part($prefix,$token->[2]->{'part'});
3248: if (defined($token->[2]->{'id'})) {
3249: $keyroot.='_'.$token->[2]->{'id'};
3250: }
3251: if ($metacache{$uri.':packages'}) {
3252: $metacache{$uri.':packages'}.=','.$package.$keyroot;
3253: } else {
3254: $metacache{$uri.':packages'}=$package.$keyroot;
3255: }
3256: foreach (keys %packagetab) {
3257: if ($_=~/^$package\&/) {
3258: my ($pack,$name,$subp)=split(/\&/,$_);
3259: my $value=$packagetab{$_};
3260: my $part=$keyroot;
3261: $part=~s/^\_//;
3262: if ($subp eq 'display') {
3263: $value.=' [Part: '.$part.']';
3264: }
3265: my $unikey='parameter'.$keyroot.'_'.$name;
3266: if ($subp eq 'default') { $unikey='parameter_0_'.$name; }
3267: $metathesekeys{$unikey}=1;
3268: $metacache{$uri.':'.$unikey.'.part'}=$part;
3269: unless (defined($metacache{$uri.':'.$unikey.'.'.$subp})) {
3270: $metacache{$uri.':'.$unikey.'.'.$subp}=$value;
3271: }
3272: if (defined($metacache{$uri.':'.$unikey.'.default'})) {
3273: $metacache{$uri.':'.$unikey}=
3274: $metacache{$uri.':'.$unikey.'.default'}
3275: }
3276: }
3277: }
3278: } else {
3279: #
3280: # This is not a package - some other kind of start tag
3281: #
3282: my $entry=$token->[1];
3283: my $unikey;
3284: if ($entry eq 'import') {
3285: $unikey='';
3286: } else {
3287: $unikey=$entry;
3288: }
3289: $unikey.=&add_prefix_and_part($prefix,$token->[2]->{'part'});
3290:
3291: if (defined($token->[2]->{'id'})) {
3292: $unikey.='_'.$token->[2]->{'id'};
3293: }
3294:
3295: if ($entry eq 'import') {
3296: #
3297: # Importing a library here
3298: #
3299: if ($depthcount<20) {
3300: my $location=$parser->get_text('/import');
3301: my $dir=$filename;
3302: $dir=~s|[^/]*$||;
3303: $location=&filelocation($dir,$location);
3304: foreach (sort(split(/\,/,&metadata($uri,'keys',
3305: $location,$unikey,
3306: $depthcount+1)))) {
3307: $metathesekeys{$_}=1;
3308: }
3309: }
3310: } else {
3311:
3312: if (defined($token->[2]->{'name'})) {
3313: $unikey.='_'.$token->[2]->{'name'};
3314: }
3315: $metathesekeys{$unikey}=1;
3316: foreach (@{$token->[3]}) {
3317: $metacache{$uri.':'.$unikey.'.'.$_}=$token->[2]->{$_};
3318: }
3319: my $internaltext=&HTML::Entities::decode($parser->get_text('/'.$entry));
3320: my $default=$metacache{$uri.':'.$unikey.'.default'};
3321: if ( $internaltext =~ /^\s*$/ && $default !~ /^\s*$/) {
3322: # only ws inside the tag, and not in default, so use default
3323: # as value
3324: $metacache{$uri.':'.$unikey}=$default;
3325: } else {
3326: # either something interesting inside the tag or default
3327: # uninteresting
3328: $metacache{$uri.':'.$unikey}=$internaltext;
3329: }
3330: # end of not-a-package not-a-library import
3331: }
3332: # end of not-a-package start tag
3333: }
3334: # the next is the end of "start tag"
3335: }
3336: }
3337: # are there custom rights to evaluate
3338: if ($metacache{$uri.':copyright'} eq 'custom') {
3339:
3340: #
3341: # Importing a rights file here
3342: #
3343: unless ($depthcount) {
3344: my $location=$metacache{$uri.':customdistributionfile'};
3345: my $dir=$filename;
3346: $dir=~s|[^/]*$||;
3347: $location=&filelocation($dir,$location);
3348: foreach (sort(split(/\,/,&metadata($uri,'keys',
3349: $location,'_rights',
3350: $depthcount+1)))) {
3351: $metathesekeys{$_}=1;
3352: }
3353: }
3354: }
3355: $metacache{$uri.':keys'}=join(',',keys %metathesekeys);
3356: &metadata_generate_part0(\%metathesekeys,\%metacache,$uri);
3357: $metacache{$uri.':allpossiblekeys'}=join(',',keys %metathesekeys);
3358: $metacache{$uri.':cachedtimestamp'}=time;
3359: # this is the end of "was not already recently cached
3360: }
3361: return $metacache{$uri.':'.$what};
3362: }
3363:
3364: sub metadata_generate_part0 {
3365: my ($metadata,$metacache,$uri) = @_;
3366: my %allnames;
3367: foreach my $metakey (sort keys %$metadata) {
3368: if ($metakey=~/^parameter\_(.*)/) {
3369: my $part=$$metacache{$uri.':'.$metakey.'.part'};
3370: my $name=$$metacache{$uri.':'.$metakey.'.name'};
3371: if (! exists($$metadata{'parameter_0_'.$name})) {
3372: $allnames{$name}=$part;
3373: }
3374: }
3375: }
3376: foreach my $name (keys(%allnames)) {
3377: $$metadata{"parameter_0_$name"}=1;
3378: my $key="$uri:parameter_0_$name";
3379: $$metacache{"$key.part"}='0';
3380: $$metacache{"$key.name"}=$name;
3381: $$metacache{"$key.type"}=$$metacache{$uri.':parameter_'.
3382: $allnames{$name}.'_'.$name.
3383: '.type'};
3384: my $olddis=$$metacache{$uri.':parameter_'.$allnames{$name}.'_'.$name.
3385: '.display'};
3386: my $expr='\\[Part: '.$allnames{$name}.'\\]';
3387: $olddis=~s/$expr/\[Part: 0\]/;
3388: $$metacache{"$key.display"}=$olddis;
3389: }
3390: }
3391:
3392: # ------------------------------------------------- Get the title of a resource
3393:
3394: sub gettitle {
3395: my $urlsymb=shift;
3396: my $symb=&symbread($urlsymb);
3397: unless ($symb) {
3398: unless ($urlsymb) { $urlsymb=$ENV{'request.filename'}; }
3399: return &metadata($urlsymb,'title');
3400: }
3401: if ($titlecache{$symb}) { return $titlecache{$symb}; }
3402: my ($map,$resid,$url)=split(/\_\_\_/,$symb);
3403: my $title='';
3404: my %bighash;
3405: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
3406: &GDBM_READER(),0640)) {
3407: my $mapid=$bighash{'map_pc_'.&clutter($map)};
3408: $title=$bighash{'title_'.$mapid.'.'.$resid};
3409: untie %bighash;
3410: }
3411: if ($title) {
3412: $titlecache{$symb}=$title;
3413: return $title;
3414: } else {
3415: return &metadata($urlsymb,'title');
3416: }
3417: }
3418:
3419: # ------------------------------------------------- Update symbolic store links
3420:
3421: sub symblist {
3422: my ($mapname,%newhash)=@_;
3423: $mapname=declutter($mapname);
3424: my %hash;
3425: if (($ENV{'request.course.fn'}) && (%newhash)) {
3426: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
3427: &GDBM_WRCREAT(),0640)) {
3428: foreach (keys %newhash) {
3429: $hash{declutter($_)}=$mapname.'___'.$newhash{$_};
3430: }
3431: if (untie(%hash)) {
3432: return 'ok';
3433: }
3434: }
3435: }
3436: return 'error';
3437: }
3438:
3439: # --------------------------------------------------------------- Verify a symb
3440:
3441: sub symbverify {
3442: my ($symb,$thisfn)=@_;
3443: $thisfn=&declutter($thisfn);
3444: # direct jump to resource in page or to a sequence - will construct own symbs
3445: if ($thisfn=~/\.(page|sequence)$/) { return 1; }
3446: # check URL part
3447: my ($map,$resid,$url)=split(/\_\_\_/,$symb);
3448: unless (&symbclean($url) eq &symbclean($thisfn)) { return 0; }
3449:
3450: $symb=&symbclean($symb);
3451:
3452: my %bighash;
3453: my $okay=0;
3454: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
3455: &GDBM_READER(),0640)) {
3456: my $ids=$bighash{'ids_'.&clutter($thisfn)};
3457: unless ($ids) {
3458: $ids=$bighash{'ids_/'.$thisfn};
3459: }
3460: if ($ids) {
3461: # ------------------------------------------------------------------- Has ID(s)
3462: foreach (split(/\,/,$ids)) {
3463: my ($mapid,$resid)=split(/\./,$_);
3464: if (
3465: &symbclean(&declutter($bighash{'map_id_'.$mapid}).'___'.$resid.'___'.$thisfn)
3466: eq $symb) {
3467: $okay=1;
3468: }
3469: }
3470: }
3471: untie(%bighash);
3472: }
3473: return $okay;
3474: }
3475:
3476: # --------------------------------------------------------------- Clean-up symb
3477:
3478: sub symbclean {
3479: my $symb=shift;
3480:
3481: # remove version from map
3482: $symb=~s/\.(\d+)\.(\w+)\_\_\_/\.$2\_\_\_/;
3483:
3484: # remove version from URL
3485: $symb=~s/\.(\d+)\.(\w+)$/\.$2/;
3486:
3487: return $symb;
3488: }
3489:
3490: # ------------------------------------------------------ Return symb list entry
3491:
3492: sub symbread {
3493: my ($thisfn,$donotrecurse)=@_;
3494: # no filename provided? try from environment
3495: unless ($thisfn) {
3496: if ($ENV{'request.symb'}) { return &symbclean($ENV{'request.symb'}); }
3497: $thisfn=$ENV{'request.filename'};
3498: }
3499: # is that filename actually a symb? Verify, clean, and return
3500: if ($thisfn=~/\_\_\_\d+\_\_\_(.*)$/) {
3501: if (&symbverify($thisfn,$1)) { return &symbclean($thisfn); }
3502: }
3503: $thisfn=declutter($thisfn);
3504: my %hash;
3505: my %bighash;
3506: my $syval='';
3507: if (($ENV{'request.course.fn'}) && ($thisfn)) {
3508: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
3509: &GDBM_READER(),0640)) {
3510: $syval=$hash{$thisfn};
3511: untie(%hash);
3512: }
3513: # ---------------------------------------------------------- There was an entry
3514: if ($syval) {
3515: unless ($syval=~/\_\d+$/) {
3516: unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {
3517: &appenv('request.ambiguous' => $thisfn);
3518: return '';
3519: }
3520: $syval.=$1;
3521: }
3522: } else {
3523: # ------------------------------------------------------- Was not in symb table
3524: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
3525: &GDBM_READER(),0640)) {
3526: # ---------------------------------------------- Get ID(s) for current resource
3527: my $ids=$bighash{'ids_'.&clutter($thisfn)};
3528: unless ($ids) {
3529: $ids=$bighash{'ids_/'.$thisfn};
3530: }
3531: unless ($ids) {
3532: # alias?
3533: $ids=$bighash{'mapalias_'.$thisfn};
3534: }
3535: if ($ids) {
3536: # ------------------------------------------------------------------- Has ID(s)
3537: my @possibilities=split(/\,/,$ids);
3538: if ($#possibilities==0) {
3539: # ----------------------------------------------- There is only one possibility
3540: my ($mapid,$resid)=split(/\./,$ids);
3541: $syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;
3542: } elsif (!$donotrecurse) {
3543: # ------------------------------------------ There is more than one possibility
3544: my $realpossible=0;
3545: foreach (@possibilities) {
3546: my $file=$bighash{'src_'.$_};
3547: if (&allowed('bre',$file)) {
3548: my ($mapid,$resid)=split(/\./,$_);
3549: if ($bighash{'map_type_'.$mapid} ne 'page') {
3550: $realpossible++;
3551: $syval=declutter($bighash{'map_id_'.$mapid}).
3552: '___'.$resid;
3553: }
3554: }
3555: }
3556: if ($realpossible!=1) { $syval=''; }
3557: } else {
3558: $syval='';
3559: }
3560: }
3561: untie(%bighash)
3562: }
3563: }
3564: if ($syval) {
3565: return &symbclean($syval.'___'.$thisfn);
3566: }
3567: }
3568: &appenv('request.ambiguous' => $thisfn);
3569: return '';
3570: }
3571:
3572: # ---------------------------------------------------------- Return random seed
3573:
3574: sub numval {
3575: my $txt=shift;
3576: $txt=~tr/A-J/0-9/;
3577: $txt=~tr/a-j/0-9/;
3578: $txt=~tr/K-T/0-9/;
3579: $txt=~tr/k-t/0-9/;
3580: $txt=~tr/U-Z/0-5/;
3581: $txt=~tr/u-z/0-5/;
3582: $txt=~s/\D//g;
3583: return int($txt);
3584: }
3585:
3586: sub rndseed {
3587: my ($symb,$courseid,$domain,$username)=@_;
3588: if (!$symb) {
3589: unless ($symb=&symbread()) { return time; }
3590: }
3591: if (!$courseid) { $courseid=$ENV{'request.course.id'};}
3592: if (!$domain) {$domain=$ENV{'user.domain'};}
3593: if (!$username) {$username=$ENV{'user.name'};}
3594: {
3595: use integer;
3596: my $symbchck=unpack("%32C*",$symb) << 27;
3597: my $symbseed=numval($symb) << 22;
3598: my $namechck=unpack("%32C*",$username) << 17;
3599: my $nameseed=numval($username) << 12;
3600: my $domainseed=unpack("%32C*",$domain) << 7;
3601: my $courseseed=unpack("%32C*",$courseid);
3602: my $num=$symbseed+$nameseed+$domainseed+$courseseed+$namechck+$symbchck;
3603: #uncommenting these lines can break things!
3604: #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
3605: #&Apache::lonxml::debug("rndseed :$num:$symb");
3606: return $num;
3607: }
3608: }
3609:
3610: sub ireceipt {
3611: my ($funame,$fudom,$fucourseid,$fusymb)=@_;
3612: my $cuname=unpack("%32C*",$funame);
3613: my $cudom=unpack("%32C*",$fudom);
3614: my $cucourseid=unpack("%32C*",$fucourseid);
3615: my $cusymb=unpack("%32C*",$fusymb);
3616: my $cunique=unpack("%32C*",$perlvar{'lonReceipt'});
3617: return unpack("%32C*",$perlvar{'lonHostID'}).'-'.
3618: ($cunique%$cuname+
3619: $cunique%$cudom+
3620: $cusymb%$cuname+
3621: $cusymb%$cudom+
3622: $cucourseid%$cuname+
3623: $cucourseid%$cudom);
3624: }
3625:
3626: sub receipt {
3627: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
3628: return &ireceipt($name,$domain,$courseid,$symb);
3629: }
3630:
3631: # ------------------------------------------------------------ Serves up a file
3632: # returns either the contents of the file or a -1
3633: sub getfile {
3634: my $file=shift;
3635: if ($file=~/^\/*uploaded\//) { # user file
3636: my $ua=new LWP::UserAgent;
3637: my $request=new HTTP::Request('GET',&tokenwrapper($file));
3638: my $response=$ua->request($request);
3639: if ($response->is_success()) {
3640: return $response->content;
3641: } else {
3642: return -1;
3643: }
3644: } else { # normal file from res space
3645: &repcopy($file);
3646: if (! -e $file ) { return -1; };
3647: my $fh=Apache::File->new($file);
3648: my $a='';
3649: while (<$fh>) { $a .=$_; }
3650: return $a;
3651: }
3652: }
3653:
3654: sub filelocation {
3655: my ($dir,$file) = @_;
3656: my $location;
3657: $file=~ s/^\s*(\S+)\s*$/$1/; ## strip off leading and trailing spaces
3658: if ($file=~m:^/~:) { # is a contruction space reference
3659: $location = $file;
3660: $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
3661: } elsif ($file=~/^\/*uploaded/) { # is an uploaded file
3662: $location=$file;
3663: } else {
3664: $file=~s/^$perlvar{'lonDocRoot'}//;
3665: $file=~s:^/*res::;
3666: if ( !( $file =~ m:^/:) ) {
3667: $location = $dir. '/'.$file;
3668: } else {
3669: $location = '/home/httpd/html/res'.$file;
3670: }
3671: }
3672: $location=~s://+:/:g; # remove duplicate /
3673: while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
3674: return $location;
3675: }
3676:
3677: sub hreflocation {
3678: my ($dir,$file)=@_;
3679: unless (($file=~/^http:\/\//i) || ($file=~/^\//)) {
3680: my $finalpath=filelocation($dir,$file);
3681: $finalpath=~s/^\/home\/httpd\/html//;
3682: $finalpath=~s-/home/(\w+)/public_html/-/~$1/-;
3683: return $finalpath;
3684: } else {
3685: return $file;
3686: }
3687: }
3688:
3689: # ------------------------------------------------------------- Declutters URLs
3690:
3691: sub declutter {
3692: my $thisfn=shift;
3693: $thisfn=~s/^$perlvar{'lonDocRoot'}//;
3694: $thisfn=~s/^\///;
3695: $thisfn=~s/^res\///;
3696: $thisfn=~s/\?.+$//;
3697: return $thisfn;
3698: }
3699:
3700: # ------------------------------------------------------------- Clutter up URLs
3701:
3702: sub clutter {
3703: my $thisfn='/'.&declutter(shift);
3704: unless ($thisfn=~/^\/(uploaded|adm|userfiles|ext|raw|priv)\//) {
3705: $thisfn='/res'.$thisfn;
3706: }
3707: return $thisfn;
3708: }
3709:
3710: # -------------------------------------------------------- Escape Special Chars
3711:
3712: sub escape {
3713: my $str=shift;
3714: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
3715: return $str;
3716: }
3717:
3718: # ----------------------------------------------------- Un-Escape Special Chars
3719:
3720: sub unescape {
3721: my $str=shift;
3722: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
3723: return $str;
3724: }
3725:
3726: # ================================================================ Main Program
3727:
3728: sub goodbye {
3729: &logthis("Starting Shut down");
3730: &flushcourselogs();
3731: &logthis("Shutting down");
3732: }
3733:
3734: BEGIN {
3735: # ----------------------------------- Read loncapa.conf and loncapa_apache.conf
3736: unless ($readit) {
3737: {
3738: my $config=Apache::File->new("/etc/httpd/conf/loncapa.conf");
3739:
3740: while (my $configline=<$config>) {
3741: if ($configline =~ /^[^\#]*PerlSetVar/) {
3742: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
3743: chomp($varvalue);
3744: $perlvar{$varname}=$varvalue;
3745: }
3746: }
3747: }
3748: {
3749: my $config=Apache::File->new("/etc/httpd/conf/loncapa_apache.conf");
3750:
3751: while (my $configline=<$config>) {
3752: if ($configline =~ /^[^\#]*PerlSetVar/) {
3753: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
3754: chomp($varvalue);
3755: $perlvar{$varname}=$varvalue;
3756: }
3757: }
3758: }
3759:
3760: # ------------------------------------------------------------ Read domain file
3761: {
3762: my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.
3763: '/domain.tab');
3764: %domaindescription = ();
3765: %domain_auth_def = ();
3766: %domain_auth_arg_def = ();
3767: if ($fh) {
3768: while (<$fh>) {
3769: next if /^\#/;
3770: chomp;
3771: my ($domain, $domain_description, $def_auth, $def_auth_arg)
3772: = split(/:/,$_,4);
3773: $domain_auth_def{$domain}=$def_auth;
3774: $domain_auth_arg_def{$domain}=$def_auth_arg;
3775: $domaindescription{$domain}=$domain_description;
3776: # &logthis("Domain.tab: $domain, $domain_auth_def{$domain}, $domain_auth_arg_def{$domain},$domaindescription{$domain}");
3777: # &logthis("Domain.tab: $domain ".$domaindescription{$domain} );
3778: }
3779: }
3780: }
3781:
3782:
3783: # ------------------------------------------------------------- Read hosts file
3784: {
3785: my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
3786:
3787: while (my $configline=<$config>) {
3788: next if ($configline =~ /^(\#|\s*$)/);
3789: chomp($configline);
3790: my ($id,$domain,$role,$name,$ip,$domdescr)=split(/:/,$configline);
3791: if ($id && $domain && $role && $name && $ip) {
3792: $hostname{$id}=$name;
3793: $hostdom{$id}=$domain;
3794: $hostip{$id}=$ip;
3795: $iphost{$ip}=$id;
3796: if ($role eq 'library') { $libserv{$id}=$name; }
3797: } else {
3798: if ($configline) {
3799: &logthis("Skipping hosts.tab line -$configline-");
3800: }
3801: }
3802: }
3803: }
3804:
3805: # ------------------------------------------------------ Read spare server file
3806: {
3807: my $config=Apache::File->new("$perlvar{'lonTabDir'}/spare.tab");
3808:
3809: while (my $configline=<$config>) {
3810: chomp($configline);
3811: if ($configline) {
3812: $spareid{$configline}=1;
3813: }
3814: }
3815: }
3816: # ------------------------------------------------------------ Read permissions
3817: {
3818: my $config=Apache::File->new("$perlvar{'lonTabDir'}/roles.tab");
3819:
3820: while (my $configline=<$config>) {
3821: chomp($configline);
3822: if ($configline) {
3823: my ($role,$perm)=split(/ /,$configline);
3824: if ($perm ne '') { $pr{$role}=$perm; }
3825: }
3826: }
3827: }
3828:
3829: # -------------------------------------------- Read plain texts for permissions
3830: {
3831: my $config=Apache::File->new("$perlvar{'lonTabDir'}/rolesplain.tab");
3832:
3833: while (my $configline=<$config>) {
3834: chomp($configline);
3835: if ($configline) {
3836: my ($short,$plain)=split(/:/,$configline);
3837: if ($plain ne '') { $prp{$short}=$plain; }
3838: }
3839: }
3840: }
3841:
3842: # ---------------------------------------------------------- Read package table
3843: {
3844: my $config=Apache::File->new("$perlvar{'lonTabDir'}/packages.tab");
3845:
3846: while (my $configline=<$config>) {
3847: chomp($configline);
3848: my ($short,$plain)=split(/:/,$configline);
3849: my ($pack,$name)=split(/\&/,$short);
3850: if ($plain ne '') {
3851: $packagetab{$pack.'&'.$name.'&name'}=$name;
3852: $packagetab{$short}=$plain;
3853: }
3854: }
3855: }
3856:
3857: # ------------- set up temporary directory
3858: {
3859: $tmpdir = $perlvar{'lonDaemons'}.'/tmp/';
3860:
3861: }
3862:
3863: %metacache=();
3864:
3865: $processmarker='_'.time.'_'.$perlvar{'lonHostID'};
3866: $dumpcount=0;
3867:
3868: &logtouch();
3869: &logthis('<font color=yellow>INFO: Read configuration</font>');
3870: $readit=1;
3871: }
3872: }
3873:
3874: 1;
3875: __END__
3876:
3877: =pod
3878:
3879: =head1 NAME
3880:
3881: Apache::lonnet - Subroutines to ask questions about things in the network.
3882:
3883: =head1 SYNOPSIS
3884:
3885: Invoked by other LON-CAPA modules, when they need to talk to or about objects in the network.
3886:
3887: &Apache::lonnet::SUBROUTINENAME(ARGUMENTS);
3888:
3889: Common parameters:
3890:
3891: =over 4
3892:
3893: =item *
3894:
3895: $uname : an internal username (if $cname expecting a course Id specifically)
3896:
3897: =item *
3898:
3899: $udom : a domain (if $cdom expecting a course's domain specifically)
3900:
3901: =item *
3902:
3903: $symb : a resource instance identifier
3904:
3905: =item *
3906:
3907: $namespace : the name of a .db file that contains the data needed or
3908: being set.
3909:
3910: =back
3911:
3912: =head1 INTRODUCTION
3913:
3914: This module provides subroutines which interact with the
3915: lonc/lond (TCP) network layer of LON-CAPA. And Can be used to ask about
3916: - classes
3917: - users
3918: - resources
3919:
3920: For many of these objects you can also use this to store data about
3921: them or modify them in various ways.
3922:
3923: This is part of the LearningOnline Network with CAPA project
3924: described at http://www.lon-capa.org.
3925:
3926: =head1 RETURN MESSAGES
3927:
3928: =over 4
3929:
3930: =item *
3931:
3932: con_lost : unable to contact remote host
3933:
3934: =item *
3935:
3936: con_delayed : unable to contact remote host, message will be delivered
3937: when the connection is brought back up
3938:
3939: =item *
3940:
3941: con_failed : unable to contact remote host and unable to save message
3942: for later delivery
3943:
3944: =item *
3945:
3946: error: : an error a occured, a description of the error follows the :
3947:
3948: =item *
3949:
3950: no_such_host : unable to fund a host associated with the user/domain
3951: that was requested
3952:
3953: =back
3954:
3955: =head1 PUBLIC SUBROUTINES
3956:
3957: =head2 Session Environment Functions
3958:
3959: =over 4
3960:
3961: =item *
3962:
3963: appenv(%hash) : the value of %hash is written to the user envirnoment
3964: file, and will be restored for each access this user makes during this
3965: session, also modifies the %ENV for the current process
3966:
3967: =item *
3968:
3969: delenv($regexp) : removes all items from the session environment file that matches the regular expression in $regexp. The values are also delted from the current processes %ENV.
3970:
3971: =back
3972:
3973: =head2 User Information
3974:
3975: =over 4
3976:
3977: =item *
3978:
3979: queryauthenticate($uname,$udom) : try to determine user's current
3980: authentication scheme
3981:
3982: =item *
3983:
3984: authenticate($uname,$upass,$udom) : try to authenticate user from domain's lib
3985: servers (first use the current one), $upass should be the users password
3986:
3987: =item *
3988:
3989: homeserver($uname,$udom) : find the server which has the user's
3990: directory and files (there must be only one), this caches the answer,
3991: and also caches if there is a borken connection.
3992:
3993: =item *
3994:
3995: idget($udom,@ids) : find the usernames behind a list of IDs (IDs are a
3996: unique resource in a domain, there must be only 1 ID per username, and
3997: only 1 username per ID in a specific domain) (returns hash:
3998: id=>name,id=>name)
3999:
4000: =item *
4001:
4002: idrget($udom,@unames) : find the IDs behind a list of usernames (returns hash:
4003: name=>id,name=>id)
4004:
4005: =item *
4006:
4007: idput($udom,%ids) : store away a list of names and associated IDs
4008:
4009: =item *
4010:
4011: rolesinit($udom,$username,$authhost) : get user privileges
4012:
4013: =item *
4014:
4015: usection($udom,$uname,$cname) : finds the section of student in the
4016: course $cname, return section name/number or '' for "not in course"
4017: and '-1' for "no section"
4018:
4019: =item *
4020:
4021: userenvironment($udom,$uname,@what) : gets the values of the keys
4022: passed in @what from the requested user's environment, returns a hash
4023:
4024: =back
4025:
4026: =head2 User Roles
4027:
4028: =over 4
4029:
4030: =item *
4031:
4032: allowed($priv,$uri) : check for a user privilege; returns codes for allowed
4033: actions
4034: F: full access
4035: U,I,K: authentication modes (cxx only)
4036: '': forbidden
4037: 1: user needs to choose course
4038: 2: browse allowed
4039:
4040: =item *
4041:
4042: definerole($rolename,$sysrole,$domrole,$courole) : define role; define a custom
4043: role rolename set privileges in format of lonTabs/roles.tab for system, domain,
4044: and course level
4045:
4046: =item *
4047:
4048: plaintext($short) : return value in %prp hash (rolesplain.tab); plain text
4049: explanation of a user role term
4050:
4051: =back
4052:
4053: =head2 User Modification
4054:
4055: =over 4
4056:
4057: =item *
4058:
4059: assignrole($udom,$uname,$url,$role,$end,$start) : assign role; give a role to a
4060: user for the level given by URL. Optional start and end dates (leave empty
4061: string or zero for "no date")
4062:
4063: =item *
4064:
4065: changepass($uname,$udom,$currentpass,$newpass,$server) : attempts to
4066: change a users, password, possible return values are: ok,
4067: pwchange_failure, non_authorized, auth_mode_error, unknown_user,
4068: refused
4069:
4070: =item *
4071:
4072: modifyuserauth($udom,$uname,$umode,$upass) : modify user authentication
4073:
4074: =item *
4075:
4076: modifyuser($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene) :
4077: modify user
4078:
4079: =item *
4080:
4081: modifystudent
4082:
4083: modify a students enrollment and identification information.
4084: The course id is resolved based on the current users environment.
4085: This means the envoking user must be a course coordinator or otherwise
4086: associated with a course.
4087:
4088: This call is essentially a wrapper for lonnet::modifyuser and
4089: lonnet::modify_student_enrollment
4090:
4091: Inputs:
4092:
4093: =over 4
4094:
4095: =item B<$udom> Students loncapa domain
4096:
4097: =item B<$uname> Students loncapa login name
4098:
4099: =item B<$uid> Students id/student number
4100:
4101: =item B<$umode> Students authentication mode
4102:
4103: =item B<$upass> Students password
4104:
4105: =item B<$first> Students first name
4106:
4107: =item B<$middle> Students middle name
4108:
4109: =item B<$last> Students last name
4110:
4111: =item B<$gene> Students generation
4112:
4113: =item B<$usec> Students section in course
4114:
4115: =item B<$end> Unix time of the roles expiration
4116:
4117: =item B<$start> Unix time of the roles start date
4118:
4119: =item B<$forceid> If defined, allow $uid to be changed
4120:
4121: =item B<$desiredhome> server to use as home server for student
4122:
4123: =back
4124:
4125: =item *
4126:
4127: modify_student_enrollment
4128:
4129: Change a students enrollment status in a class. The environment variable
4130: 'role.request.course' must be defined for this function to proceed.
4131:
4132: Inputs:
4133:
4134: =over 4
4135:
4136: =item $udom, students domain
4137:
4138: =item $uname, students name
4139:
4140: =item $uid, students user id
4141:
4142: =item $first, students first name
4143:
4144: =item $middle
4145:
4146: =item $last
4147:
4148: =item $gene
4149:
4150: =item $usec
4151:
4152: =item $end
4153:
4154: =item $start
4155:
4156: =back
4157:
4158:
4159: =item *
4160:
4161: assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start) : assign
4162: custom role; give a custom role to a user for the level given by URL. Specify
4163: name and domain of role author, and role name
4164:
4165: =item *
4166:
4167: revokerole($udom,$uname,$url,$role) : revoke a role for url
4168:
4169: =item *
4170:
4171: revokecustomrole($udom,$uname,$url,$role) : revoke a custom role
4172:
4173: =back
4174:
4175: =head2 Course Infomation
4176:
4177: =over 4
4178:
4179: =item *
4180:
4181: coursedescription($courseid) : course description
4182:
4183: =item *
4184:
4185: courseresdata($coursenum,$coursedomain,@which) : request for current
4186: parameter setting for a specific course, @what should be a list of
4187: parameters to ask about. This routine caches answers for 5 minutes.
4188:
4189: =back
4190:
4191: =head2 Course Modification
4192:
4193: =over 4
4194:
4195: =item *
4196:
4197: writecoursepref($courseid,%prefs) : write preferences (environment
4198: database) for a course
4199:
4200: =item *
4201:
4202: createcourse($udom,$description,$url) : make/modify course
4203:
4204: =back
4205:
4206: =head2 Resource Subroutines
4207:
4208: =over 4
4209:
4210: =item *
4211:
4212: subscribe($fname) : subscribe to a resource, returns URL if possible (probably should use repcopy instead)
4213:
4214: =item *
4215:
4216: repcopy($filename) : subscribes to the requested file, and attempts to
4217: replicate from the owning library server, Might return
4218: HTTP_SERVICE_UNAVAILABLE, HTTP_NOT_FOUND, FORBIDDEN, OK, or
4219: HTTP_BAD_REQUEST, also attempts to grab the metadata for the
4220: resource. Expects the local filesystem pathname
4221: (/home/httpd/html/res/....)
4222:
4223: =back
4224:
4225: =head2 Resource Information
4226:
4227: =over 4
4228:
4229: =item *
4230:
4231: EXT($varname,$symb,$udom,$uname) : evaluates and returns the value of
4232: a vairety of different possible values, $varname should be a request
4233: string, and the other parameters can be used to specify who and what
4234: one is asking about.
4235:
4236: Possible values for $varname are environment.lastname (or other item
4237: from the envirnment hash), user.name (or someother aspect about the
4238: user), resource.0.maxtries (or some other part and parameter of a
4239: resource)
4240:
4241: =item *
4242:
4243: directcondval($number) : get current value of a condition; reads from a state
4244: string
4245:
4246: =item *
4247:
4248: condval($condidx) : value of condition index based on state
4249:
4250: =item *
4251:
4252: metadata($uri,$what,$liburi,$prefix,$depthcount) : request a
4253: resource's metadata, $what should be either a specific key, or either
4254: 'keys' (to get a list of possible keys) or 'packages' to get a list of
4255: packages that this resource currently uses, the last 3 arguments are only used internally for recursive metadata.
4256:
4257: this function automatically caches all requests
4258:
4259: =item *
4260:
4261: metadata_query($query,$custom,$customshow) : make a metadata query against the
4262: network of library servers; returns file handle of where SQL and regex results
4263: will be stored for query
4264:
4265: =item *
4266:
4267: symbread($filename) : return symbolic list entry (filename argument optional);
4268: returns the data handle
4269:
4270: =item *
4271:
4272: symbverify($symb,$thisfn) : verifies that $symb actually exists and is
4273: a possible symb for the URL in $thisfn, returns a 1 on success, 0 on
4274: failure, user must be in a course, as it assumes the existance of the
4275: course initi hash, and uses $ENV('request.course.id'}
4276:
4277:
4278: =item *
4279:
4280: symbclean($symb) : removes versions numbers from a symb, returns the
4281: cleaned symb
4282:
4283: =item *
4284:
4285: is_on_map($uri) : checks if the $uri is somewhere on the current
4286: course map, user must be in a course for it to work.
4287:
4288: =item *
4289:
4290: numval($salt) : return random seed value (addend for rndseed)
4291:
4292: =item *
4293:
4294: rndseed($symb,$courseid,$udom,$uname) : create a random sum; returns
4295: a random seed, all arguments are optional, if they aren't sent it uses the
4296: environment to derive them. Note: if symb isn't sent and it can't get one
4297: from &symbread it will use the current time as its return value
4298:
4299: =item *
4300:
4301: ireceipt($funame,$fudom,$fucourseid,$fusymb) : return unique,
4302: unfakeable, receipt
4303:
4304: =item *
4305:
4306: receipt() : API to ireceipt working off of ENV values; given out to users
4307:
4308: =item *
4309:
4310: countacc($url) : count the number of accesses to a given URL
4311:
4312: =item *
4313:
4314: checkout($symb,$tuname,$tudom,$tcrsid) : creates a record of a user having looked at an item, most likely printed out or otherwise using a resource
4315:
4316: =item *
4317:
4318: checkin($token) : updates that a resource has beeen returned (a hard copy version for instance) and returns the data that $token was Checkout with ($symb, $tuname, $tudom, and $tcrsid)
4319:
4320: =item *
4321:
4322: expirespread($uname,$udom,$stype,$usymb) : set expire date for spreadsheet
4323:
4324: =item *
4325:
4326: devalidate($symb) : devalidate temporary spreadsheet calculations,
4327: forcing spreadsheet to reevaluate the resource scores next time.
4328:
4329: =back
4330:
4331: =head2 Storing/Retreiving Data
4332:
4333: =over 4
4334:
4335: =item *
4336:
4337: store($storehash,$symb,$namespace,$udom,$uname) : stores hash permanently
4338: for this url; hashref needs to be given and should be a \%hashname; the
4339: remaining args aren't required and if they aren't passed or are '' they will
4340: be derived from the ENV
4341:
4342: =item *
4343:
4344: cstore($storehash,$symb,$namespace,$udom,$uname) : same as store but
4345: uses critical subroutine
4346:
4347: =item *
4348:
4349: restore($symb,$namespace,$udom,$uname) : returns hash for this symb;
4350: all args are optional
4351:
4352: =item *
4353:
4354: tmpstore($storehash,$symb,$namespace,$udom,$uname) : storage that
4355: works very similar to store/cstore, but all data is stored in a
4356: temporary location and can be reset using tmpreset, $storehash should
4357: be a hash reference, returns nothing on success
4358:
4359: =item *
4360:
4361: tmprestore($symb,$namespace,$udom,$uname) : storage that works very
4362: similar to restore, but all data is stored in a temporary location and
4363: can be reset using tmpreset. Returns a hash of values on success,
4364: error string otherwise.
4365:
4366: =item *
4367:
4368: tmpreset($symb,$namespace,$udom,$uname) : temporary storage reset,
4369: deltes all keys for $symb form the temporary storage hash.
4370:
4371: =item *
4372:
4373: get($namespace,$storearr,$udom,$uname) : returns hash with keys from array
4374: reference filled in from namesp ($udom and $uname are optional)
4375:
4376: =item *
4377:
4378: del($namespace,$storearr,$udom,$uname) : deletes keys out of array from
4379: namesp ($udom and $uname are optional)
4380:
4381: =item *
4382:
4383: dump($namespace,$udom,$uname,$regexp) :
4384: dumps the complete (or key matching regexp) namespace into a hash
4385: ($udom, $uname and $regexp are optional)
4386:
4387: =item *
4388:
4389: put($namespace,$storehash,$udom,$uname) : stores hash in namesp
4390: ($udom and $uname are optional)
4391:
4392: =item *
4393:
4394: cput($namespace,$storehash,$udom,$uname) : critical put
4395: ($udom and $uname are optional)
4396:
4397: =item *
4398:
4399: eget($namespace,$storearr,$udom,$uname) : returns hash with keys from array
4400: reference filled in from namesp (encrypts the return communication)
4401: ($udom and $uname are optional)
4402:
4403: =item *
4404:
4405: log($udom,$name,$home,$message) : write to permanent log for user; use
4406: critical subroutine
4407:
4408: =back
4409:
4410: =head2 Network Status Functions
4411:
4412: =over 4
4413:
4414: =item *
4415:
4416: dirlist($uri) : return directory list based on URI
4417:
4418: =item *
4419:
4420: spareserver() : find server with least workload from spare.tab
4421:
4422: =back
4423:
4424: =head2 Apache Request
4425:
4426: =over 4
4427:
4428: =item *
4429:
4430: ssi($url,%hash) : server side include, does a complete request cycle on url to
4431: localhost, posts hash
4432:
4433: =back
4434:
4435: =head2 Data to String to Data
4436:
4437: =over 4
4438:
4439: =item *
4440:
4441: hash2str(%hash) : convert a hash into a string complete with escaping and '='
4442: and '&' separators, supports elements that are arrayrefs and hashrefs
4443:
4444: =item *
4445:
4446: hashref2str($hashref) : convert a hashref into a string complete with
4447: escaping and '=' and '&' separators, supports elements that are
4448: arrayrefs and hashrefs
4449:
4450: =item *
4451:
4452: arrayref2str($arrayref) : convert an arrayref into a string complete
4453: with escaping and '&' separators, supports elements that are arrayrefs
4454: and hashrefs
4455:
4456: =item *
4457:
4458: str2hash($string) : convert string to hash using unescaping and
4459: splitting on '=' and '&', supports elements that are arrayrefs and
4460: hashrefs
4461:
4462: =item *
4463:
4464: str2array($string) : convert string to hash using unescaping and
4465: splitting on '&', supports elements that are arrayrefs and hashrefs
4466:
4467: =back
4468:
4469: =head2 Logging Routines
4470:
4471: =over 4
4472:
4473: These routines allow one to make log messages in the lonnet.log and
4474: lonnet.perm logfiles.
4475:
4476: =item *
4477:
4478: logtouch() : make sure the logfile, lonnet.log, exists
4479:
4480: =item *
4481:
4482: logthis() : append message to the normal lonnet.log file, it gets
4483: preiodically rolled over and deleted.
4484:
4485: =item *
4486:
4487: logperm() : append a permanent message to lonnet.perm.log, this log
4488: file never gets deleted by any automated portion of the system, only
4489: messages of critical importance should go in here.
4490:
4491: =back
4492:
4493: =head2 General File Helper Routines
4494:
4495: =over 4
4496:
4497: =item *
4498:
4499: getfile($file) : returns the entire contents of a file or -1; it
4500: properly subscribes to and replicates the file if neccessary.
4501:
4502: =item *
4503:
4504: filelocation($dir,$file) : returns file system location of a file
4505: based on URI; meant to be "fairly clean" absolute reference, $dir is a
4506: directory that relative $file lookups are to looked in ($dir of /a/dir
4507: and a file of ../bob will become /a/bob)
4508:
4509: =item *
4510:
4511: hreflocation($dir,$file) : returns file system location or a URL; same as
4512: filelocation except for hrefs
4513:
4514: =item *
4515:
4516: declutter() : declutters URLs (remove docroot, beginning slashes, 'res' etc)
4517:
4518: =back
4519:
4520: =head2 HTTP Helper Routines
4521:
4522: =over 4
4523:
4524: =item *
4525:
4526: escape() : unpack non-word characters into CGI-compatible hex codes
4527:
4528: =item *
4529:
4530: unescape() : pack CGI-compatible hex codes into actual non-word ASCII character
4531:
4532: =back
4533:
4534: =head1 PRIVATE SUBROUTINES
4535:
4536: =head2 Underlying communication routines (Shouldn't call)
4537:
4538: =over 4
4539:
4540: =item *
4541:
4542: subreply() : tries to pass a message to lonc, returns con_lost if incapable
4543:
4544: =item *
4545:
4546: reply() : uses subreply to send a message to remote machine, logs all failures
4547:
4548: =item *
4549:
4550: critical() : passes a critical message to another server; if cannot
4551: get through then place message in connection buffer directory and
4552: returns con_delayed, if incapable of saving message, returns
4553: con_failed
4554:
4555: =item *
4556:
4557: reconlonc() : tries to reconnect lonc client processes.
4558:
4559: =back
4560:
4561: =head2 Resource Access Logging
4562:
4563: =over 4
4564:
4565: =item *
4566:
4567: flushcourselogs() : flush (save) buffer logs and access logs
4568:
4569: =item *
4570:
4571: courselog($what) : save message for course in hash
4572:
4573: =item *
4574:
4575: courseacclog($what) : save message for course using &courselog(). Perform
4576: special processing for specific resource types (problems, exams, quizzes, etc).
4577:
4578: =item *
4579:
4580: goodbye() : flush course logs and log shutting down; it is called in srm.conf
4581: as a PerlChildExitHandler
4582:
4583: =back
4584:
4585: =head2 Other
4586:
4587: =over 4
4588:
4589: =item *
4590:
4591: symblist($mapname,%newhash) : update symbolic storage links
4592:
4593: =back
4594:
4595: =cut
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