1: # The LearningOnline Network
2: # TCP networking package
3: #
4: # $Id: lonnet.pm,v 1.260 2002/08/02 21:11:55 ng Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # 6/1/99,6/2,6/10,6/11,6/12,6/14,6/26,6/28,6/29,6/30,
29: # 7/1,7/2,7/9,7/10,7/12,7/14,7/15,7/19,
30: # 11/8,11/16,11/18,11/22,11/23,12/22,
31: # 01/06,01/13,02/24,02/28,02/29,
32: # 03/01,03/02,03/06,03/07,03/13,
33: # 04/05,05/29,05/31,06/01,
34: # 06/05,06/26 Gerd Kortemeyer
35: # 06/26 Ben Tyszka
36: # 06/30,07/15,07/17,07/18,07/20,07/21,07/22,07/25 Gerd Kortemeyer
37: # 08/14 Ben Tyszka
38: # 08/22,08/28,08/31,09/01,09/02,09/04,09/05,09/25,09/28,09/30 Gerd Kortemeyer
39: # 10/04 Gerd Kortemeyer
40: # 10/04 Guy Albertelli
41: # 10/06,10/09,10/10,10/11,10/14,10/20,10/23,10/25,10/26,10/27,10/28,10/29,
42: # 10/30,10/31,
43: # 11/2,11/14,11/15,11/16,11/20,11/21,11/22,11/25,11/27,
44: # 12/02,12/12,12/13,12/14,12/28,12/29 Gerd Kortemeyer
45: # 05/01/01 Guy Albertelli
46: # 05/01,06/01,09/01 Gerd Kortemeyer
47: # 09/01 Guy Albertelli
48: # 09/01,10/01,11/01 Gerd Kortemeyer
49: # YEAR=2001
50: # 02/27/01 Scott Harrison
51: # 3/2 Gerd Kortemeyer
52: # 3/15,3/19 Scott Harrison
53: # 3/19,3/20 Gerd Kortemeyer
54: # 3/22,3/27,4/2,4/16,4/17 Scott Harrison
55: # 5/26,5/28 Gerd Kortemeyer
56: # 5/30 H. K. Ng
57: # 6/1 Gerd Kortemeyer
58: # July Guy Albertelli
59: # 8/4,8/7,8/8,8/9,8/11,8/16,8/17,8/18,8/20,8/23,9/20,9/21,9/26,
60: # 10/2 Gerd Kortemeyer
61: # 10/5,10/10,11/13,11/15 Scott Harrison
62: # 11/17,11/20,11/22,11/29 Gerd Kortemeyer
63: # 12/5 Matthew Hall
64: # 12/5 Guy Albertelli
65: # 12/6,12/7,12/12 Gerd Kortemeyer
66: # 12/18 Scott Harrison
67: # 12/21,12/22,12/27,12/28 Gerd Kortemeyer
68: # YEAR=2002
69: # 1/4,2/4,2/7 Gerd Kortemeyer
70: #
71: ###
72:
73: package Apache::lonnet;
74:
75: use strict;
76: use Apache::File;
77: use LWP::UserAgent();
78: use HTTP::Headers;
79: use vars
80: qw(%perlvar %hostname %homecache %badServerCache %hostip %spareid %hostdom
81: %libserv %pr %prp %metacache %packagetab
82: %courselogs %accesshash $processmarker $dumpcount
83: %coursedombuf %coursehombuf %courseresdatacache %domaindescription);
84: use IO::Socket;
85: use GDBM_File;
86: use Apache::Constants qw(:common :http);
87: use HTML::LCParser;
88: use Fcntl qw(:flock);
89: my $readit;
90:
91: # --------------------------------------------------------------------- Logging
92:
93: sub logtouch {
94: my $execdir=$perlvar{'lonDaemons'};
95: unless (-e "$execdir/logs/lonnet.log") {
96: my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
97: close $fh;
98: }
99: my ($wwwuid,$wwwgid)=(getpwnam('www'))[2,3];
100: chown($wwwuid,$wwwgid,$execdir.'/logs/lonnet.log');
101: }
102:
103: sub logthis {
104: my $message=shift;
105: my $execdir=$perlvar{'lonDaemons'};
106: my $now=time;
107: my $local=localtime($now);
108: my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
109: print $fh "$local ($$): $message\n";
110: return 1;
111: }
112:
113: sub logperm {
114: my $message=shift;
115: my $execdir=$perlvar{'lonDaemons'};
116: my $now=time;
117: my $local=localtime($now);
118: my $fh=Apache::File->new(">>$execdir/logs/lonnet.perm.log");
119: print $fh "$now:$message:$local\n";
120: return 1;
121: }
122:
123: # -------------------------------------------------- Non-critical communication
124: sub subreply {
125: my ($cmd,$server)=@_;
126: my $peerfile="$perlvar{'lonSockDir'}/$server";
127: my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
128: Type => SOCK_STREAM,
129: Timeout => 10)
130: or return "con_lost";
131: print $client "$cmd\n";
132: my $answer=<$client>;
133: if (!$answer) { $answer="con_lost"; }
134: chomp($answer);
135: return $answer;
136: }
137:
138: sub reply {
139: my ($cmd,$server)=@_;
140: unless (defined($hostname{$server})) { return 'no_such_host'; }
141: my $answer=subreply($cmd,$server);
142: if ($answer eq 'con_lost') {
143: #sleep 5;
144: #$answer=subreply($cmd,$server);
145: #if ($answer eq 'con_lost') {
146: # &logthis("Second attempt con_lost on $server");
147: # my $peerfile="$perlvar{'lonSockDir'}/$server";
148: # my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
149: # Type => SOCK_STREAM,
150: # Timeout => 10)
151: # or return "con_lost";
152: # &logthis("Killing socket");
153: # print $client "close_connection_exit\n";
154: #sleep 5;
155: # $answer=subreply($cmd,$server);
156: #}
157: }
158: if (($answer=~/^refused/) || ($answer=~/^rejected/)) {
159: &logthis("<font color=blue>WARNING:".
160: " $cmd to $server returned $answer</font>");
161: }
162: return $answer;
163: }
164:
165: # ----------------------------------------------------------- Send USR1 to lonc
166:
167: sub reconlonc {
168: my $peerfile=shift;
169: &logthis("Trying to reconnect for $peerfile");
170: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
171: if (my $fh=Apache::File->new("$loncfile")) {
172: my $loncpid=<$fh>;
173: chomp($loncpid);
174: if (kill 0 => $loncpid) {
175: &logthis("lonc at pid $loncpid responding, sending USR1");
176: kill USR1 => $loncpid;
177: sleep 1;
178: if (-e "$peerfile") { return; }
179: &logthis("$peerfile still not there, give it another try");
180: sleep 5;
181: if (-e "$peerfile") { return; }
182: &logthis(
183: "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
184: } else {
185: &logthis(
186: "<font color=blue>WARNING:".
187: " lonc at pid $loncpid not responding, giving up</font>");
188: }
189: } else {
190: &logthis('<font color=blue>WARNING: lonc not running, giving up</font>');
191: }
192: }
193:
194: # ------------------------------------------------------ Critical communication
195:
196: sub critical {
197: my ($cmd,$server)=@_;
198: unless ($hostname{$server}) {
199: &logthis("<font color=blue>WARNING:".
200: " Critical message to unknown server ($server)</font>");
201: return 'no_such_host';
202: }
203: my $answer=reply($cmd,$server);
204: if ($answer eq 'con_lost') {
205: my $pingreply=reply('ping',$server);
206: &reconlonc("$perlvar{'lonSockDir'}/$server");
207: my $pongreply=reply('pong',$server);
208: &logthis("Ping/Pong for $server: $pingreply/$pongreply");
209: $answer=reply($cmd,$server);
210: if ($answer eq 'con_lost') {
211: my $now=time;
212: my $middlename=$cmd;
213: $middlename=substr($middlename,0,16);
214: $middlename=~s/\W//g;
215: my $dfilename=
216: "$perlvar{'lonSockDir'}/delayed/$now.$middlename.$server";
217: {
218: my $dfh;
219: if ($dfh=Apache::File->new(">$dfilename")) {
220: print $dfh "$cmd\n";
221: }
222: }
223: sleep 2;
224: my $wcmd='';
225: {
226: my $dfh;
227: if ($dfh=Apache::File->new("$dfilename")) {
228: $wcmd=<$dfh>;
229: }
230: }
231: chomp($wcmd);
232: if ($wcmd eq $cmd) {
233: &logthis("<font color=blue>WARNING: ".
234: "Connection buffer $dfilename: $cmd</font>");
235: &logperm("D:$server:$cmd");
236: return 'con_delayed';
237: } else {
238: &logthis("<font color=red>CRITICAL:"
239: ." Critical connection failed: $server $cmd</font>");
240: &logperm("F:$server:$cmd");
241: return 'con_failed';
242: }
243: }
244: }
245: return $answer;
246: }
247:
248: # ---------------------------------------------------------- Append Environment
249:
250: sub appenv {
251: my %newenv=@_;
252: foreach (keys %newenv) {
253: if (($newenv{$_}=~/^user\.role/) || ($newenv{$_}=~/^user\.priv/)) {
254: &logthis("<font color=blue>WARNING: ".
255: "Attempt to modify environment ".$_." to ".$newenv{$_}
256: .'</font>');
257: delete($newenv{$_});
258: } else {
259: $ENV{$_}=$newenv{$_};
260: }
261: }
262:
263: my $lockfh;
264: unless ($lockfh=Apache::File->new("$ENV{'user.environment'}")) {
265: return 'error: '.$!;
266: }
267: unless (flock($lockfh,LOCK_EX)) {
268: &logthis("<font color=blue>WARNING: ".
269: 'Could not obtain exclusive lock in appenv: '.$!);
270: $lockfh->close();
271: return 'error: '.$!;
272: }
273:
274: my @oldenv;
275: {
276: my $fh;
277: unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
278: return 'error: '.$!;
279: }
280: @oldenv=<$fh>;
281: $fh->close();
282: }
283: for (my $i=0; $i<=$#oldenv; $i++) {
284: chomp($oldenv[$i]);
285: if ($oldenv[$i] ne '') {
286: my ($name,$value)=split(/=/,$oldenv[$i]);
287: unless (defined($newenv{$name})) {
288: $newenv{$name}=$value;
289: }
290: }
291: }
292: {
293: my $fh;
294: unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
295: return 'error';
296: }
297: my $newname;
298: foreach $newname (keys %newenv) {
299: print $fh "$newname=$newenv{$newname}\n";
300: }
301: $fh->close();
302: }
303:
304: $lockfh->close();
305: return 'ok';
306: }
307: # ----------------------------------------------------- Delete from Environment
308:
309: sub delenv {
310: my $delthis=shift;
311: my %newenv=();
312: if (($delthis=~/user\.role/) || ($delthis=~/user\.priv/)) {
313: &logthis("<font color=blue>WARNING: ".
314: "Attempt to delete from environment ".$delthis);
315: return 'error';
316: }
317: my @oldenv;
318: {
319: my $fh;
320: unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
321: return 'error';
322: }
323: unless (flock($fh,LOCK_SH)) {
324: &logthis("<font color=blue>WARNING: ".
325: 'Could not obtain shared lock in delenv: '.$!);
326: $fh->close();
327: return 'error: '.$!;
328: }
329: @oldenv=<$fh>;
330: $fh->close();
331: }
332: {
333: my $fh;
334: unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
335: return 'error';
336: }
337: unless (flock($fh,LOCK_EX)) {
338: &logthis("<font color=blue>WARNING: ".
339: 'Could not obtain exclusive lock in delenv: '.$!);
340: $fh->close();
341: return 'error: '.$!;
342: }
343: foreach (@oldenv) {
344: unless ($_=~/^$delthis/) { print $fh $_; }
345: }
346: $fh->close();
347: }
348: return 'ok';
349: }
350:
351: # ------------------------------ Find server with least workload from spare.tab
352:
353: sub spareserver {
354: my $tryserver;
355: my $spareserver='';
356: my $lowestserver=100;
357: foreach $tryserver (keys %spareid) {
358: my $answer=reply('load',$tryserver);
359: if (($answer =~ /\d/) && ($answer<$lowestserver)) {
360: $spareserver="http://$hostname{$tryserver}";
361: $lowestserver=$answer;
362: }
363: }
364: return $spareserver;
365: }
366:
367: # --------------------------------------------- Try to change a user's password
368:
369: sub changepass {
370: my ($uname,$udom,$currentpass,$newpass,$server)=@_;
371: $currentpass = &escape($currentpass);
372: $newpass = &escape($newpass);
373: my $answer = reply("encrypt:passwd:$udom:$uname:$currentpass:$newpass",
374: $server);
375: if (! $answer) {
376: &logthis("No reply on password change request to $server ".
377: "by $uname in domain $udom.");
378: } elsif ($answer =~ "^ok") {
379: &logthis("$uname in $udom successfully changed their password ".
380: "on $server.");
381: } elsif ($answer =~ "^pwchange_failure") {
382: &logthis("$uname in $udom was unable to change their password ".
383: "on $server. The action was blocked by either lcpasswd ".
384: "or pwchange");
385: } elsif ($answer =~ "^non_authorized") {
386: &logthis("$uname in $udom did not get their password correct when ".
387: "attempting to change it on $server.");
388: } elsif ($answer =~ "^auth_mode_error") {
389: &logthis("$uname in $udom attempted to change their password despite ".
390: "not being locally or internally authenticated on $server.");
391: } elsif ($answer =~ "^unknown_user") {
392: &logthis("$uname in $udom attempted to change their password ".
393: "on $server but were unable to because $server is not ".
394: "their home server.");
395: } elsif ($answer =~ "^refused") {
396: &logthis("$server refused to change $uname in $udom password because ".
397: "it was sent an unencrypted request to change the password.");
398: }
399: return $answer;
400: }
401:
402: # ----------------------- Try to determine user's current authentication scheme
403:
404: sub queryauthenticate {
405: my ($uname,$udom)=@_;
406: if (($perlvar{'lonRole'} eq 'library') &&
407: ($udom eq $perlvar{'lonDefDomain'})) {
408: my $answer=reply("encrypt:currentauth:$udom:$uname",
409: $perlvar{'lonHostID'});
410: unless ($answer eq 'unknown_user' or $answer eq 'refused') {
411: if (length($answer)) {
412: return $answer;
413: }
414: else {
415: &logthis("User $uname at $udom lacks an authentication mechanism");
416: return 'no_host';
417: }
418: }
419: }
420:
421: my $tryserver;
422: foreach $tryserver (keys %libserv) {
423: if ($hostdom{$tryserver} eq $udom) {
424: my $answer=reply("encrypt:currentauth:$udom:$uname",$tryserver);
425: unless ($answer eq 'unknown_user' or $answer eq 'refused') {
426: if (length($answer)) {
427: return $answer;
428: }
429: else {
430: &logthis("User $uname at $udom lacks an authentication mechanism");
431: return 'no_host';
432: }
433: }
434: }
435: }
436: &logthis("User $uname at $udom lacks an authentication mechanism");
437: return 'no_host';
438: }
439:
440: # --------- Try to authenticate user from domain's lib servers (first this one)
441:
442: sub authenticate {
443: my ($uname,$upass,$udom)=@_;
444: $upass=escape($upass);
445: $uname=~s/\W//g;
446: if (($perlvar{'lonRole'} eq 'library') &&
447: ($udom eq $perlvar{'lonDefDomain'})) {
448: my $answer=reply("encrypt:auth:$udom:$uname:$upass",$perlvar{'lonHostID'});
449: if ($answer =~ /authorized/) {
450: if ($answer eq 'authorized') {
451: &logthis("User $uname at $udom authorized by local server");
452: return $perlvar{'lonHostID'};
453: }
454: if ($answer eq 'non_authorized') {
455: &logthis("User $uname at $udom rejected by local server");
456: return 'no_host';
457: }
458: }
459: }
460:
461: my $tryserver;
462: foreach $tryserver (keys %libserv) {
463: if ($hostdom{$tryserver} eq $udom) {
464: my $answer=reply("encrypt:auth:$udom:$uname:$upass",$tryserver);
465: if ($answer =~ /authorized/) {
466: if ($answer eq 'authorized') {
467: &logthis("User $uname at $udom authorized by $tryserver");
468: return $tryserver;
469: }
470: if ($answer eq 'non_authorized') {
471: &logthis("User $uname at $udom rejected by $tryserver");
472: return 'no_host';
473: }
474: }
475: }
476: }
477: &logthis("User $uname at $udom could not be authenticated");
478: return 'no_host';
479: }
480:
481: # ---------------------- Find the homebase for a user from domain's lib servers
482:
483: sub homeserver {
484: my ($uname,$udom,$ignoreBadCache)=@_;
485: my $index="$uname:$udom";
486: if ($homecache{$index}) {
487: return "$homecache{$index}";
488: }
489: my $tryserver;
490: foreach $tryserver (keys %libserv) {
491: next if ($ignoreBadCache ne 'true' &&
492: exists($badServerCache{$tryserver}));
493: if ($hostdom{$tryserver} eq $udom) {
494: my $answer=reply("home:$udom:$uname",$tryserver);
495: if ($answer eq 'found') {
496: $homecache{$index}=$tryserver;
497: return $tryserver;
498: } elsif ($answer eq 'no_host') {
499: $badServerCache{$tryserver}=1;
500: }
501: }
502: }
503: return 'no_host';
504: }
505:
506: # ------------------------------------- Find the usernames behind a list of IDs
507:
508: sub idget {
509: my ($udom,@ids)=@_;
510: my %returnhash=();
511:
512: my $tryserver;
513: foreach $tryserver (keys %libserv) {
514: if ($hostdom{$tryserver} eq $udom) {
515: my $idlist=join('&',@ids);
516: $idlist=~tr/A-Z/a-z/;
517: my $reply=&reply("idget:$udom:".$idlist,$tryserver);
518: my @answer=();
519: if (($reply ne 'con_lost') && ($reply!~/^error\:/)) {
520: @answer=split(/\&/,$reply);
521: } ;
522: my $i;
523: for ($i=0;$i<=$#ids;$i++) {
524: if ($answer[$i]) {
525: $returnhash{$ids[$i]}=$answer[$i];
526: }
527: }
528: }
529: }
530: return %returnhash;
531: }
532:
533: # ------------------------------------- Find the IDs behind a list of usernames
534:
535: sub idrget {
536: my ($udom,@unames)=@_;
537: my %returnhash=();
538: foreach (@unames) {
539: $returnhash{$_}=(&userenvironment($udom,$_,'id'))[1];
540: }
541: return %returnhash;
542: }
543:
544: # ------------------------------- Store away a list of names and associated IDs
545:
546: sub idput {
547: my ($udom,%ids)=@_;
548: my %servers=();
549: foreach (keys %ids) {
550: my $uhom=&homeserver($_,$udom);
551: if ($uhom ne 'no_host') {
552: my $id=&escape($ids{$_});
553: $id=~tr/A-Z/a-z/;
554: my $unam=&escape($_);
555: if ($servers{$uhom}) {
556: $servers{$uhom}.='&'.$id.'='.$unam;
557: } else {
558: $servers{$uhom}=$id.'='.$unam;
559: }
560: &critical('put:'.$udom.':'.$unam.':environment:id='.$id,$uhom);
561: }
562: }
563: foreach (keys %servers) {
564: &critical('idput:'.$udom.':'.$servers{$_},$_);
565: }
566: }
567:
568: # ------------------------------------- Find the section of student in a course
569:
570: sub usection {
571: my ($udom,$unam,$courseid)=@_;
572: $courseid=~s/\_/\//g;
573: $courseid=~s/^(\w)/\/$1/;
574: foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
575: &homeserver($unam,$udom)))) {
576: my ($key,$value)=split(/\=/,$_);
577: $key=&unescape($key);
578: if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
579: my $section=$1;
580: if ($key eq $courseid.'_st') { $section=''; }
581: my ($dummy,$end,$start)=split(/\_/,&unescape($value));
582: my $now=time;
583: my $notactive=0;
584: if ($start) {
585: if ($now<$start) { $notactive=1; }
586: }
587: if ($end) {
588: if ($now>$end) { $notactive=1; }
589: }
590: unless ($notactive) { return $section; }
591: }
592: }
593: return '-1';
594: }
595:
596: # ------------------------------------- Read an entry from a user's environment
597:
598: sub userenvironment {
599: my ($udom,$unam,@what)=@_;
600: my %returnhash=();
601: my @answer=split(/\&/,
602: &reply('get:'.$udom.':'.$unam.':environment:'.join('&',@what),
603: &homeserver($unam,$udom)));
604: my $i;
605: for ($i=0;$i<=$#what;$i++) {
606: $returnhash{$what[$i]}=&unescape($answer[$i]);
607: }
608: return %returnhash;
609: }
610:
611: # ----------------------------- Subscribe to a resource, return URL if possible
612:
613: sub subscribe {
614: my $fname=shift;
615: my $author=$fname;
616: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
617: my ($udom,$uname)=split(/\//,$author);
618: my $home=homeserver($uname,$udom);
619: if (($home eq 'no_host') || ($home eq $perlvar{'lonHostID'})) {
620: return 'not_found';
621: }
622: my $answer=reply("sub:$fname",$home);
623: if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
624: $answer.=' by '.$home;
625: }
626: return $answer;
627: }
628:
629: # -------------------------------------------------------------- Replicate file
630:
631: sub repcopy {
632: my $filename=shift;
633: $filename=~s/\/+/\//g;
634: if ($filename=~/^\/home\/httpd\/html\/adm\//) { return OK; }
635: my $transname="$filename.in.transfer";
636: if ((-e $filename) || (-e $transname)) { return OK; }
637: my $remoteurl=subscribe($filename);
638: if ($remoteurl =~ /^con_lost by/) {
639: &logthis("Subscribe returned $remoteurl: $filename");
640: return HTTP_SERVICE_UNAVAILABLE;
641: } elsif ($remoteurl eq 'not_found') {
642: &logthis("Subscribe returned not_found: $filename");
643: return HTTP_NOT_FOUND;
644: } elsif ($remoteurl =~ /^rejected by/) {
645: &logthis("Subscribe returned $remoteurl: $filename");
646: return FORBIDDEN;
647: } elsif ($remoteurl eq 'directory') {
648: return OK;
649: } else {
650: my @parts=split(/\//,$filename);
651: my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";
652: if ($path ne "$perlvar{'lonDocRoot'}/res") {
653: &logthis("Malconfiguration for replication: $filename");
654: return HTTP_BAD_REQUEST;
655: }
656: my $count;
657: for ($count=5;$count<$#parts;$count++) {
658: $path.="/$parts[$count]";
659: if ((-e $path)!=1) {
660: mkdir($path,0777);
661: }
662: }
663: my $ua=new LWP::UserAgent;
664: my $request=new HTTP::Request('GET',"$remoteurl");
665: my $response=$ua->request($request,$transname);
666: if ($response->is_error()) {
667: unlink($transname);
668: my $message=$response->status_line;
669: &logthis("<font color=blue>WARNING:"
670: ." LWP get: $message: $filename</font>");
671: return HTTP_SERVICE_UNAVAILABLE;
672: } else {
673: if ($remoteurl!~/\.meta$/) {
674: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
675: my $mresponse=$ua->request($mrequest,$filename.'.meta');
676: if ($mresponse->is_error()) {
677: unlink($filename.'.meta');
678: &logthis(
679: "<font color=yellow>INFO: No metadata: $filename</font>");
680: }
681: }
682: rename($transname,$filename);
683: return OK;
684: }
685: }
686: }
687:
688: # --------------------------------------------------------- Server Side Include
689:
690: sub ssi {
691:
692: my ($fn,%form)=@_;
693:
694: my $ua=new LWP::UserAgent;
695:
696: my $request;
697:
698: if (%form) {
699: $request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);
700: $request->content(join('&',map { &escape($_).'='.&escape($form{$_}) } keys %form));
701: } else {
702: $request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);
703: }
704:
705: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
706: my $response=$ua->request($request);
707:
708: return $response->content;
709: }
710:
711: # ------- Add a token to a remote URI's query string to vouch for access rights
712:
713: sub tokenwrapper {
714: my $uri=shift;
715: $uri=~s/^http\:\/\/([^\/]+)//;
716: $uri=~s/^\///;
717: $ENV{'user.environment'}=~/\/([^\/]+)\.id/;
718: my $token=$1;
719: if ($uri=~/^uploaded\/([^\/]+)\/([^\/]+)\/([^\/]+)(\?\.*)*$/) {
720: &appenv('userfile.'.$1.'/'.$2.'/'.$3 => $ENV{'request.course.id'});
721: return 'http://'.$hostname{ &homeserver($2,$1)}.'/'.$uri.
722: (($uri=~/\?/)?'&':'?').'token='.$token;
723: } else {
724: return '/adm/notfound.html';
725: }
726: }
727:
728: # --------------- Take an uploaded file and put it into the userfiles directory
729: # input: name of form element, coursedoc=1 means this is for the course
730: # output: url of file in userspace
731:
732: sub userfileupload {
733: my ($formname,$coursedoc)=@_;
734: my $fname=$ENV{'form.'.$formname.'.filename'};
735: $fname=~s/\\/\//g;
736: $fname=~s/^.*\/([^\/]+)$/$1/;
737: unless ($fname) { return 'error: no uploaded file'; }
738: chop($ENV{'form.'.$formname});
739: # Create the directory if not present
740: my $docuname='';
741: my $docudom='';
742: my $docuhome='';
743: if ($coursedoc) {
744: $docuname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
745: $docudom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
746: $docuhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
747: } else {
748: $docuname=$ENV{'user.name'};
749: $docudom=$ENV{'user.domain'};
750: $docuhome=$ENV{'user.home'};
751: }
752: my $path=$docudom.'/'.$docuname.'/';
753: my $filepath=$perlvar{'lonDocRoot'};
754: my @parts=split(/\//,$filepath.'/userfiles/'.$path);
755: my $count;
756: for ($count=4;$count<=$#parts;$count++) {
757: $filepath.="/$parts[$count]";
758: if ((-e $filepath)!=1) {
759: mkdir($filepath,0777);
760: }
761: }
762: # Save the file
763: {
764: my $fh=Apache::File->new('>'.$filepath.'/'.$fname);
765: print $fh $ENV{'form.'.$formname};
766: }
767: # Notify homeserver to grep it
768: #
769: # FIXME - this still needs to happen
770: #
771: # Return the URL to it
772: return '/uploaded/'.$path.$fname;
773: }
774:
775: # ------------------------------------------------------------------------- Log
776:
777: sub log {
778: my ($dom,$nam,$hom,$what)=@_;
779: return critical("log:$dom:$nam:$what",$hom);
780: }
781:
782: # ------------------------------------------------------------------ Course Log
783:
784: sub flushcourselogs {
785: &logthis('Flushing course log buffers');
786: foreach (keys %courselogs) {
787: my $crsid=$_;
788: if (&reply('log:'.$coursedombuf{$crsid}.':'.
789: &escape($courselogs{$crsid}),
790: $coursehombuf{$crsid}) eq 'ok') {
791: delete $courselogs{$crsid};
792: } else {
793: &logthis('Failed to flush log buffer for '.$crsid);
794: if (length($courselogs{$crsid})>40000) {
795: &logthis("<font color=blue>WARNING: Buffer for ".$crsid.
796: " exceeded maximum size, deleting.</font>");
797: delete $courselogs{$crsid};
798: }
799: }
800: }
801: &logthis('Flushing access logs');
802: foreach (keys %accesshash) {
803: my $entry=$_;
804: $entry=~/\_\_\_(\w+)\/(\w+)\/(.*)\_\_\_(\w+)$/;
805: my %temphash=($entry => $accesshash{$entry});
806: if (&Apache::lonnet::put('resevaldata',\%temphash,$1,$2) eq 'ok') {
807: delete $accesshash{$entry};
808: }
809: }
810: $dumpcount++;
811: }
812:
813: sub courselog {
814: my $what=shift;
815: $what=time.':'.$what;
816: unless ($ENV{'request.course.id'}) { return ''; }
817: $coursedombuf{$ENV{'request.course.id'}}=
818: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.
819: $ENV{'course.'.$ENV{'request.course.id'}.'.num'};
820: $coursehombuf{$ENV{'request.course.id'}}=
821: $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
822: if (defined $courselogs{$ENV{'request.course.id'}}) {
823: $courselogs{$ENV{'request.course.id'}}.='&'.$what;
824: } else {
825: $courselogs{$ENV{'request.course.id'}}.=$what;
826: }
827: if (length($courselogs{$ENV{'request.course.id'}})>4048) {
828: &flushcourselogs();
829: }
830: }
831:
832: sub courseacclog {
833: my $fnsymb=shift;
834: unless ($ENV{'request.course.id'}) { return ''; }
835: my $what=$fnsymb.':'.$ENV{'user.name'}.':'.$ENV{'user.domain'};
836: if ($fnsymb=~/(problem|exam|quiz|assess|survey|form)$/) {
837: $what.=':POST';
838: foreach (keys %ENV) {
839: if ($_=~/^form\.(.*)/) {
840: $what.=':'.$1.'='.$ENV{$_};
841: }
842: }
843: }
844: &courselog($what);
845: }
846:
847: sub countacc {
848: my $url=&declutter(shift);
849: unless ($ENV{'request.course.id'}) { return ''; }
850: $accesshash{$ENV{'request.course.id'}.'___'.$url.'___course'}=1;
851: my $key=$processmarker.'_'.$dumpcount.'___'.$url.'___count';
852: if (defined($accesshash{$key})) {
853: $accesshash{$key}++;
854: } else {
855: $accesshash{$key}=1;
856: }
857: }
858:
859: # ----------------------------------------------------------- Check out an item
860:
861: sub checkout {
862: my ($symb,$tuname,$tudom,$tcrsid)=@_;
863: my $now=time;
864: my $lonhost=$perlvar{'lonHostID'};
865: my $infostr=&escape(
866: 'CHECKOUTTOKEN&'.
867: $tuname.'&'.
868: $tudom.'&'.
869: $tcrsid.'&'.
870: $symb.'&'.
871: $now.'&'.$ENV{'REMOTE_ADDR'});
872: my $token=&reply('tmpput:'.$infostr,$lonhost);
873: if ($token=~/^error\:/) {
874: &logthis("<font color=blue>WARNING: ".
875: "Checkout tmpput failed ".$tudom.' - '.$tuname.' - '.$symb.
876: "</font>");
877: return '';
878: }
879:
880: $token=~s/^(\d+)\_.*\_(\d+)$/$1\*$2\*$lonhost/;
881: $token=~tr/a-z/A-Z/;
882:
883: my %infohash=('resource.0.outtoken' => $token,
884: 'resource.0.checkouttime' => $now,
885: 'resource.0.outremote' => $ENV{'REMOTE_ADDR'});
886:
887: unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
888: return '';
889: } else {
890: &logthis("<font color=blue>WARNING: ".
891: "Checkout cstore failed ".$tudom.' - '.$tuname.' - '.$symb.
892: "</font>");
893: }
894:
895: if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
896: &escape('Checkout '.$infostr.' - '.
897: $token)) ne 'ok') {
898: return '';
899: } else {
900: &logthis("<font color=blue>WARNING: ".
901: "Checkout log failed ".$tudom.' - '.$tuname.' - '.$symb.
902: "</font>");
903: }
904: return $token;
905: }
906:
907: # ------------------------------------------------------------ Check in an item
908:
909: sub checkin {
910: my $token=shift;
911: my $now=time;
912: my ($ta,$tb,$lonhost)=split(/\*/,$token);
913: $lonhost=~tr/A-Z/a-z/;
914: my $dtoken=$ta.'_'.$hostip{$lonhost}.'_'.$tb;
915: $dtoken=~s/\W/\_/g;
916: my ($dummy,$tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=
917: split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));
918:
919: unless (($tuname) && ($tudom)) {
920: &logthis('Check in '.$token.' ('.$dtoken.') failed');
921: return '';
922: }
923:
924: unless (&allowed('mgr',$tcrsid)) {
925: &logthis('Check in '.$token.' ('.$dtoken.') unauthorized: '.
926: $ENV{'user.name'}.' - '.$ENV{'user.domain'});
927: return '';
928: }
929:
930: my %infohash=('resource.0.intoken' => $token,
931: 'resource.0.checkintime' => $now,
932: 'resource.0.inremote' => $ENV{'REMOTE_ADDR'});
933:
934: unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
935: return '';
936: }
937:
938: if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
939: &escape('Checkin - '.$token)) ne 'ok') {
940: return '';
941: }
942:
943: return ($symb,$tuname,$tudom,$tcrsid);
944: }
945:
946: # --------------------------------------------- Set Expire Date for Spreadsheet
947:
948: sub expirespread {
949: my ($uname,$udom,$stype,$usymb)=@_;
950: my $cid=$ENV{'request.course.id'};
951: if ($cid) {
952: my $now=time;
953: my $key=$uname.':'.$udom.':'.$stype.':'.$usymb;
954: return &reply('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
955: $ENV{'course.'.$cid.'.num'}.
956: ':nohist_expirationdates:'.
957: &escape($key).'='.$now,
958: $ENV{'course.'.$cid.'.home'})
959: }
960: return 'ok';
961: }
962:
963: # ----------------------------------------------------- Devalidate Spreadsheets
964:
965: sub devalidate {
966: my $symb=shift;
967: my $cid=$ENV{'request.course.id'};
968: if ($cid) {
969: my $key=$ENV{'user.name'}.':'.$ENV{'user.domain'}.':';
970: my $status=
971: &del('nohist_calculatedsheet',
972: [$key.'studentcalc'],
973: $ENV{'course.'.$cid.'.domain'},
974: $ENV{'course.'.$cid.'.num'})
975: .' '.
976: &del('nohist_calculatedsheets_'.$cid,
977: [$key.'assesscalc:'.$symb]);
978: unless ($status eq 'ok ok') {
979: &logthis('Could not devalidate spreadsheet '.
980: $ENV{'user.name'}.' at '.$ENV{'user.domain'}.' for '.
981: $symb.': '.$status);
982: }
983: }
984: }
985:
986: sub arrayref2str {
987: my ($arrayref) = @_;
988: my $result='_ARRAY_REF__';
989: foreach my $elem (@$arrayref) {
990: if (ref($elem) eq 'ARRAY') {
991: $result.=&escape(&arrayref2str($elem)).'&';
992: } elsif (ref($elem) eq 'HASH') {
993: $result.=&escape(&hashref2str($elem)).'&';
994: } elsif (ref($elem)) {
995: &logthis("Got a ref of ".(ref($elem))." skipping.");
996: } else {
997: $result.=&escape($elem).'&';
998: }
999: }
1000: $result=~s/\&$//;
1001: return $result;
1002: }
1003:
1004: sub hash2str {
1005: my (%hash) = @_;
1006: my $result=&hashref2str(\%hash);
1007: $result=~s/^_HASH_REF__//;
1008: return $result;
1009: }
1010:
1011: sub hashref2str {
1012: my ($hashref)=@_;
1013: my $result='_HASH_REF__';
1014: foreach (keys(%$hashref)) {
1015: if (ref($_) eq 'ARRAY') {
1016: $result.=&escape(&arrayref2str($_)).'=';
1017: } elsif (ref($_) eq 'HASH') {
1018: $result.=&escape(&hashref2str($_)).'=';
1019: } elsif (ref($_)) {
1020: &logthis("Got a ref of ".(ref($_))." skipping.");
1021: } else {
1022: $result.=&escape($_).'=';
1023: }
1024:
1025: if (ref($$hashref{$_}) eq 'ARRAY') {
1026: $result.=&escape(&arrayref2str($$hashref{$_})).'&';
1027: } elsif (ref($$hashref{$_}) eq 'HASH') {
1028: $result.=&escape(&hashref2str($$hashref{$_})).'&';
1029: } elsif (ref($$hashref{$_})) {
1030: &logthis("Got a ref of ".(ref($$hashref{$_}))." skipping.");
1031: } else {
1032: $result.=&escape($$hashref{$_}).'&';
1033: }
1034: }
1035: $result=~s/\&$//;
1036: return $result;
1037: }
1038:
1039: sub str2hash {
1040: my ($string) = @_;
1041: my %returnhash;
1042: foreach (split(/\&/,$string)) {
1043: my ($name,$value)=split(/\=/,$_);
1044: $name=&unescape($name);
1045: $value=&unescape($value);
1046: if ($value =~ /^_HASH_REF__/) {
1047: $value =~ s/^_HASH_REF__//;
1048: my %hash=&str2hash($value);
1049: $value=\%hash;
1050: } elsif ($value =~ /^_ARRAY_REF__/) {
1051: $value =~ s/^_ARRAY_REF__//;
1052: my @array=&str2array($value);
1053: $value=\@array;
1054: }
1055: $returnhash{$name}=$value;
1056: }
1057: return (%returnhash);
1058: }
1059:
1060: sub str2array {
1061: my ($string) = @_;
1062: my @returnarray;
1063: foreach my $value (split(/\&/,$string)) {
1064: $value=&unescape($value);
1065: if ($value =~ /^_HASH_REF__/) {
1066: $value =~ s/^_HASH_REF__//;
1067: my %hash=&str2hash($value);
1068: $value=\%hash;
1069: } elsif ($value =~ /^_ARRAY_REF__/) {
1070: $value =~ s/^_ARRAY_REF__//;
1071: my @array=&str2array($value);
1072: $value=\@array;
1073: }
1074: push(@returnarray,$value);
1075: }
1076: return (@returnarray);
1077: }
1078:
1079: # -------------------------------------------------------------------Temp Store
1080:
1081: sub tmpreset {
1082: my ($symb,$namespace,$domain,$stuname) = @_;
1083: if (!$symb) {
1084: $symb=&symbread();
1085: if (!$symb) { $symb= $ENV{'REQUEST_URI'}; }
1086: }
1087: $symb=escape($symb);
1088:
1089: if (!$namespace) { $namespace=$ENV{'request.state'}; }
1090: $namespace=~s/\//\_/g;
1091: $namespace=~s/\W//g;
1092:
1093: #FIXME needs to do something for /pub resources
1094: if (!$domain) { $domain=$ENV{'user.domain'}; }
1095: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1096: my $path=$perlvar{'lonDaemons'}.'/tmp';
1097: my %hash;
1098: if (tie(%hash,'GDBM_File',
1099: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1100: &GDBM_WRCREAT(),0640)) {
1101: foreach my $key (keys %hash) {
1102: if ($key=~ /:$symb/) {
1103: delete($hash{$key});
1104: }
1105: }
1106: }
1107: }
1108:
1109: sub tmpstore {
1110: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1111:
1112: if (!$symb) {
1113: $symb=&symbread();
1114: if (!$symb) { $symb= $ENV{'request.url'}; }
1115: }
1116: $symb=escape($symb);
1117:
1118: if (!$namespace) {
1119: # I don't think we would ever want to store this for a course.
1120: # it seems this will only be used if we don't have a course.
1121: #$namespace=$ENV{'request.course.id'};
1122: #if (!$namespace) {
1123: $namespace=$ENV{'request.state'};
1124: #}
1125: }
1126: $namespace=~s/\//\_/g;
1127: $namespace=~s/\W//g;
1128: #FIXME needs to do something for /pub resources
1129: if (!$domain) { $domain=$ENV{'user.domain'}; }
1130: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1131: my $now=time;
1132: my %hash;
1133: my $path=$perlvar{'lonDaemons'}.'/tmp';
1134: if (tie(%hash,'GDBM_File',
1135: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1136: &GDBM_WRCREAT(),0640)) {
1137: $hash{"version:$symb"}++;
1138: my $version=$hash{"version:$symb"};
1139: my $allkeys='';
1140: foreach my $key (keys(%$storehash)) {
1141: $allkeys.=$key.':';
1142: $hash{"$version:$symb:$key"}=$$storehash{$key};
1143: }
1144: $hash{"$version:$symb:timestamp"}=$now;
1145: $allkeys.='timestamp';
1146: $hash{"$version:keys:$symb"}=$allkeys;
1147: if (untie(%hash)) {
1148: return 'ok';
1149: } else {
1150: return "error:$!";
1151: }
1152: } else {
1153: return "error:$!";
1154: }
1155: }
1156:
1157: # -----------------------------------------------------------------Temp Restore
1158:
1159: sub tmprestore {
1160: my ($symb,$namespace,$domain,$stuname) = @_;
1161:
1162: if (!$symb) {
1163: $symb=&symbread();
1164: if (!$symb) { $symb= $ENV{'request.url'}; }
1165: }
1166: $symb=escape($symb);
1167:
1168: if (!$namespace) { $namespace=$ENV{'request.state'}; }
1169: #FIXME needs to do something for /pub resources
1170: if (!$domain) { $domain=$ENV{'user.domain'}; }
1171: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1172:
1173: my %returnhash;
1174: $namespace=~s/\//\_/g;
1175: $namespace=~s/\W//g;
1176: my %hash;
1177: my $path=$perlvar{'lonDaemons'}.'/tmp';
1178: if (tie(%hash,'GDBM_File',
1179: $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
1180: &GDBM_READER(),0640)) {
1181: my $version=$hash{"version:$symb"};
1182: $returnhash{'version'}=$version;
1183: my $scope;
1184: for ($scope=1;$scope<=$version;$scope++) {
1185: my $vkeys=$hash{"$scope:keys:$symb"};
1186: my @keys=split(/:/,$vkeys);
1187: my $key;
1188: $returnhash{"$scope:keys"}=$vkeys;
1189: foreach $key (@keys) {
1190: $returnhash{"$scope:$key"}=$hash{"$scope:$symb:$key"};
1191: $returnhash{"$key"}=$hash{"$scope:$symb:$key"};
1192: }
1193: }
1194: if (!(untie(%hash))) {
1195: return "error:$!";
1196: }
1197: } else {
1198: return "error:$!";
1199: }
1200: return %returnhash;
1201: }
1202:
1203: # ----------------------------------------------------------------------- Store
1204:
1205: sub store {
1206: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1207: my $home='';
1208:
1209: if ($stuname) { $home=&homeserver($stuname,$domain); }
1210:
1211: $symb=&symbclean($symb);
1212: if (!$symb) { unless ($symb=&symbread()) { return ''; } }
1213:
1214: &devalidate($symb);
1215:
1216: $symb=escape($symb);
1217: if (!$namespace) {
1218: unless ($namespace=$ENV{'request.course.id'}) {
1219: return '';
1220: }
1221: }
1222: if (!$domain) { $domain=$ENV{'user.domain'}; }
1223: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1224: if (!$home) { $home=$ENV{'user.home'}; }
1225: my $namevalue='';
1226: foreach (keys %$storehash) {
1227: $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
1228: }
1229: $namevalue=~s/\&$//;
1230: &courselog($symb.':'.$stuname.':'.$domain.':STORE:'.$namevalue);
1231: return reply("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
1232: }
1233:
1234: # -------------------------------------------------------------- Critical Store
1235:
1236: sub cstore {
1237: my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
1238: my $home='';
1239:
1240: if ($stuname) { $home=&homeserver($stuname,$domain); }
1241:
1242: $symb=&symbclean($symb);
1243: if (!$symb) { unless ($symb=&symbread()) { return ''; } }
1244:
1245: &devalidate($symb);
1246:
1247: $symb=escape($symb);
1248: if (!$namespace) {
1249: unless ($namespace=$ENV{'request.course.id'}) {
1250: return '';
1251: }
1252: }
1253: if (!$domain) { $domain=$ENV{'user.domain'}; }
1254: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1255: if (!$home) { $home=$ENV{'user.home'}; }
1256:
1257: my $namevalue='';
1258: foreach (keys %$storehash) {
1259: $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
1260: }
1261: $namevalue=~s/\&$//;
1262: &courselog($symb.':'.$stuname.':'.$domain.':CSTORE:'.$namevalue);
1263: return critical
1264: ("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
1265: }
1266:
1267: # --------------------------------------------------------------------- Restore
1268:
1269: sub restore {
1270: my ($symb,$namespace,$domain,$stuname) = @_;
1271: my $home='';
1272:
1273: if ($stuname) { $home=&homeserver($stuname,$domain); }
1274:
1275: if (!$symb) {
1276: unless ($symb=escape(&symbread())) { return ''; }
1277: } else {
1278: $symb=&escape(&symbclean($symb));
1279: }
1280: if (!$namespace) {
1281: unless ($namespace=$ENV{'request.course.id'}) {
1282: return '';
1283: }
1284: }
1285: if (!$domain) { $domain=$ENV{'user.domain'}; }
1286: if (!$stuname) { $stuname=$ENV{'user.name'}; }
1287: if (!$home) { $home=$ENV{'user.home'}; }
1288: my $answer=&reply("restore:$domain:$stuname:$namespace:$symb","$home");
1289:
1290: my %returnhash=();
1291: foreach (split(/\&/,$answer)) {
1292: my ($name,$value)=split(/\=/,$_);
1293: $returnhash{&unescape($name)}=&unescape($value);
1294: }
1295: my $version;
1296: for ($version=1;$version<=$returnhash{'version'};$version++) {
1297: foreach (split(/\:/,$returnhash{$version.':keys'})) {
1298: $returnhash{$_}=$returnhash{$version.':'.$_};
1299: }
1300: }
1301: return %returnhash;
1302: }
1303:
1304: # ---------------------------------------------------------- Course Description
1305:
1306: sub coursedescription {
1307: my $courseid=shift;
1308: $courseid=~s/^\///;
1309: $courseid=~s/\_/\//g;
1310: my ($cdomain,$cnum)=split(/\//,$courseid);
1311: my $chome=&homeserver($cnum,$cdomain);
1312: if ($chome ne 'no_host') {
1313: my %returnhash=&dump('environment',$cdomain,$cnum);
1314: if (!exists($returnhash{'con_lost'})) {
1315: my $normalid=$cdomain.'_'.$cnum;
1316: my %envhash=();
1317: $returnhash{'home'}= $chome;
1318: $returnhash{'domain'} = $cdomain;
1319: $returnhash{'num'} = $cnum;
1320: while (my ($name,$value) = each %returnhash) {
1321: $envhash{'course.'.$normalid.'.'.$name}=$value;
1322: }
1323: $returnhash{'url'}='/res/'.declutter($returnhash{'url'});
1324: $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
1325: $ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
1326: $envhash{'course.'.$normalid.'.last_cache'}=time;
1327: $envhash{'course.'.$normalid.'.home'}=$chome;
1328: $envhash{'course.'.$normalid.'.domain'}=$cdomain;
1329: $envhash{'course.'.$normalid.'.num'}=$cnum;
1330: &appenv(%envhash);
1331: return %returnhash;
1332: }
1333: }
1334: return ();
1335: }
1336:
1337: # -------------------------------------------------------- Get user privileges
1338:
1339: sub rolesinit {
1340: my ($domain,$username,$authhost)=@_;
1341: my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
1342: if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return ''; }
1343: my %allroles=();
1344: my %thesepriv=();
1345: my $now=time;
1346: my $userroles="user.login.time=$now\n";
1347: my $thesestr;
1348:
1349: if ($rolesdump ne '') {
1350: foreach (split(/&/,$rolesdump)) {
1351: if ($_!~/^rolesdef\&/) {
1352: my ($area,$role)=split(/=/,$_);
1353: $area=~s/\_\w\w$//;
1354: my ($trole,$tend,$tstart)=split(/_/,$role);
1355: $userroles.='user.role.'.$trole.'.'.$area.'='.
1356: $tstart.'.'.$tend."\n";
1357: if ($tend!=0) {
1358: if ($tend<$now) {
1359: $trole='';
1360: }
1361: }
1362: if ($tstart!=0) {
1363: if ($tstart>$now) {
1364: $trole='';
1365: }
1366: }
1367: if (($area ne '') && ($trole ne '')) {
1368: my $spec=$trole.'.'.$area;
1369: my ($tdummy,$tdomain,$trest)=split(/\//,$area);
1370: if ($trole =~ /^cr\//) {
1371: my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
1372: my $homsvr=homeserver($rauthor,$rdomain);
1373: if ($hostname{$homsvr} ne '') {
1374: my $roledef=
1375: reply("get:$rdomain:$rauthor:roles:rolesdef_$rrole",
1376: $homsvr);
1377: if (($roledef ne 'con_lost') && ($roledef ne '')) {
1378: my ($syspriv,$dompriv,$coursepriv)=
1379: split(/\_/,unescape($roledef));
1380: $allroles{'cm./'}.=':'.$syspriv;
1381: $allroles{$spec.'./'}.=':'.$syspriv;
1382: if ($tdomain ne '') {
1383: $allroles{'cm./'.$tdomain.'/'}.=':'.$dompriv;
1384: $allroles{$spec.'./'.$tdomain.'/'}.=':'.$dompriv;
1385: if ($trest ne '') {
1386: $allroles{'cm.'.$area}.=':'.$coursepriv;
1387: $allroles{$spec.'.'.$area}.=':'.$coursepriv;
1388: }
1389: }
1390: }
1391: }
1392: } else {
1393: $allroles{'cm./'}.=':'.$pr{$trole.':s'};
1394: $allroles{$spec.'./'}.=':'.$pr{$trole.':s'};
1395: if ($tdomain ne '') {
1396: $allroles{'cm./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
1397: $allroles{$spec.'./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
1398: if ($trest ne '') {
1399: $allroles{'cm.'.$area}.=':'.$pr{$trole.':c'};
1400: $allroles{$spec.'.'.$area}.=':'.$pr{$trole.':c'};
1401: }
1402: }
1403: }
1404: }
1405: }
1406: }
1407: my $adv=0;
1408: my $author=0;
1409: foreach (keys %allroles) {
1410: %thesepriv=();
1411: if (($_!~/^st/) && ($_!~/^ta/) && ($_!~/^cm/)) { $adv=1; }
1412: if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }
1413: foreach (split(/:/,$allroles{$_})) {
1414: if ($_ ne '') {
1415: my ($privilege,$restrictions)=split(/&/,$_);
1416: if ($restrictions eq '') {
1417: $thesepriv{$privilege}='F';
1418: } else {
1419: if ($thesepriv{$privilege} ne 'F') {
1420: $thesepriv{$privilege}.=$restrictions;
1421: }
1422: }
1423: }
1424: }
1425: $thesestr='';
1426: foreach (keys %thesepriv) { $thesestr.=':'.$_.'&'.$thesepriv{$_}; }
1427: $userroles.='user.priv.'.$_.'='.$thesestr."\n";
1428: }
1429: $userroles.='user.adv='.$adv."\n".
1430: 'user.author='.$author."\n";
1431: $ENV{'user.adv'}=$adv;
1432: }
1433: return $userroles;
1434: }
1435:
1436: # --------------------------------------------------------------- get interface
1437:
1438: sub get {
1439: my ($namespace,$storearr,$udomain,$uname)=@_;
1440: my $items='';
1441: foreach (@$storearr) {
1442: $items.=escape($_).'&';
1443: }
1444: $items=~s/\&$//;
1445: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1446: if (!$uname) { $uname=$ENV{'user.name'}; }
1447: my $uhome=&homeserver($uname,$udomain);
1448:
1449: my $rep=&reply("get:$udomain:$uname:$namespace:$items",$uhome);
1450: my @pairs=split(/\&/,$rep);
1451: my %returnhash=();
1452: my $i=0;
1453: foreach (@$storearr) {
1454: $returnhash{$_}=unescape($pairs[$i]);
1455: $i++;
1456: }
1457: return %returnhash;
1458: }
1459:
1460: # --------------------------------------------------------------- del interface
1461:
1462: sub del {
1463: my ($namespace,$storearr,$udomain,$uname)=@_;
1464: my $items='';
1465: foreach (@$storearr) {
1466: $items.=escape($_).'&';
1467: }
1468: $items=~s/\&$//;
1469: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1470: if (!$uname) { $uname=$ENV{'user.name'}; }
1471: my $uhome=&homeserver($uname,$udomain);
1472:
1473: return &reply("del:$udomain:$uname:$namespace:$items",$uhome);
1474: }
1475:
1476: # -------------------------------------------------------------- dump interface
1477:
1478: sub dump {
1479: my ($namespace,$udomain,$uname,$regexp)=@_;
1480: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1481: if (!$uname) { $uname=$ENV{'user.name'}; }
1482: my $uhome=&homeserver($uname,$udomain);
1483: if ($regexp) {
1484: $regexp=&escape($regexp);
1485: } else {
1486: $regexp='.';
1487: }
1488: my $rep=reply("dump:$udomain:$uname:$namespace:$regexp",$uhome);
1489: my @pairs=split(/\&/,$rep);
1490: my %returnhash=();
1491: foreach (@pairs) {
1492: my ($key,$value)=split(/=/,$_);
1493: $returnhash{unescape($key)}=unescape($value);
1494: }
1495: return %returnhash;
1496: }
1497:
1498: # --------------------------------------------------------------- put interface
1499:
1500: sub put {
1501: my ($namespace,$storehash,$udomain,$uname)=@_;
1502: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1503: if (!$uname) { $uname=$ENV{'user.name'}; }
1504: my $uhome=&homeserver($uname,$udomain);
1505: my $items='';
1506: foreach (keys %$storehash) {
1507: $items.=&escape($_).'='.&escape($$storehash{$_}).'&';
1508: }
1509: $items=~s/\&$//;
1510: return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
1511: }
1512:
1513: # ------------------------------------------------------ critical put interface
1514:
1515: sub cput {
1516: my ($namespace,$storehash,$udomain,$uname)=@_;
1517: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1518: if (!$uname) { $uname=$ENV{'user.name'}; }
1519: my $uhome=&homeserver($uname,$udomain);
1520: my $items='';
1521: foreach (keys %$storehash) {
1522: $items.=escape($_).'='.escape($$storehash{$_}).'&';
1523: }
1524: $items=~s/\&$//;
1525: return &critical("put:$udomain:$uname:$namespace:$items",$uhome);
1526: }
1527:
1528: # -------------------------------------------------------------- eget interface
1529:
1530: sub eget {
1531: my ($namespace,$storearr,$udomain,$uname)=@_;
1532: my $items='';
1533: foreach (@$storearr) {
1534: $items.=escape($_).'&';
1535: }
1536: $items=~s/\&$//;
1537: if (!$udomain) { $udomain=$ENV{'user.domain'}; }
1538: if (!$uname) { $uname=$ENV{'user.name'}; }
1539: my $uhome=&homeserver($uname,$udomain);
1540: my $rep=&reply("eget:$udomain:$uname:$namespace:$items",$uhome);
1541: my @pairs=split(/\&/,$rep);
1542: my %returnhash=();
1543: my $i=0;
1544: foreach (@$storearr) {
1545: $returnhash{$_}=unescape($pairs[$i]);
1546: $i++;
1547: }
1548: return %returnhash;
1549: }
1550:
1551: # ------------------------------------------------- Check for a user privilege
1552:
1553: sub allowed {
1554: my ($priv,$uri)=@_;
1555:
1556: my $orguri=$uri;
1557: $uri=&declutter($uri);
1558:
1559: # Free bre access to adm and meta resources
1560:
1561: if ((($uri=~/^adm\//) || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {
1562: return 'F';
1563: }
1564:
1565: # Free bre to public access
1566:
1567: if ($priv eq 'bre') {
1568: my $copyright=&metadata($uri,'copyright');
1569: if ($copyright eq 'public') { return 'F'; }
1570: if ($copyright eq 'priv') {
1571: $uri=~/([^\/]+)\/([^\/]+)\//;
1572: unless (($ENV{'user.name'} eq $2) && ($ENV{'user.domain'} eq $1)) {
1573: return '';
1574: }
1575: }
1576: if ($copyright eq 'domain') {
1577: $uri=~/([^\/]+)\/([^\/]+)\//;
1578: unless (($ENV{'user.domain'} eq $1) ||
1579: ($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $1)) {
1580: return '';
1581: }
1582: }
1583: }
1584:
1585: my $thisallowed='';
1586: my $statecond=0;
1587: my $courseprivid='';
1588:
1589: # Course
1590:
1591: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'}=~/$priv\&([^\:]*)/) {
1592: $thisallowed.=$1;
1593: }
1594:
1595: # Domain
1596:
1597: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
1598: =~/$priv\&([^\:]*)/) {
1599: $thisallowed.=$1;
1600: }
1601:
1602: # Course: uri itself is a course
1603: my $courseuri=$uri;
1604: $courseuri=~s/\_(\d)/\/$1/;
1605: $courseuri=~s/^([^\/])/\/$1/;
1606:
1607: if ($ENV{'user.priv.'.$ENV{'request.role'}.'.'.$courseuri}
1608: =~/$priv\&([^\:]*)/) {
1609: $thisallowed.=$1;
1610: }
1611:
1612: # Full access at system, domain or course-wide level? Exit.
1613:
1614: if ($thisallowed=~/F/) {
1615: return 'F';
1616: }
1617:
1618: # If this is generating or modifying users, exit with special codes
1619:
1620: if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:cca:'=~/\:$priv\:/) {
1621: return $thisallowed;
1622: }
1623: #
1624: # Gathered so far: system, domain and course wide privileges
1625: #
1626: # Course: See if uri or referer is an individual resource that is part of
1627: # the course
1628:
1629: if ($ENV{'request.course.id'}) {
1630:
1631: $courseprivid=$ENV{'request.course.id'};
1632: if ($ENV{'request.course.sec'}) {
1633: $courseprivid.='/'.$ENV{'request.course.sec'};
1634: }
1635: $courseprivid=~s/\_/\//;
1636: my $checkreferer=1;
1637: my ($match,$cond)=&is_on_map($uri);
1638: if ($match) {
1639: $statecond=$cond;
1640: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
1641: =~/$priv\&([^\:]*)/) {
1642: $thisallowed.=$1;
1643: $checkreferer=0;
1644: }
1645: }
1646:
1647: if ($checkreferer) {
1648: my $refuri=$ENV{'httpref.'.$orguri};
1649: unless ($refuri) {
1650: foreach (keys %ENV) {
1651: if ($_=~/^httpref\..*\*/) {
1652: my $pattern=$_;
1653: $pattern=~s/^httpref\.\/res\///;
1654: $pattern=~s/\*/\[\^\/\]\+/g;
1655: $pattern=~s/\//\\\//g;
1656: if ($orguri=~/$pattern/) {
1657: $refuri=$ENV{$_};
1658: }
1659: }
1660: }
1661: }
1662:
1663: if ($refuri) {
1664: $refuri=&declutter($refuri);
1665: my ($match,$cond)=&is_on_map($refuri);
1666: if ($match) {
1667: my $refstatecond=$cond;
1668: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
1669: =~/$priv\&([^\:]*)/) {
1670: $thisallowed.=$1;
1671: $uri=$refuri;
1672: $statecond=$refstatecond;
1673: }
1674: }
1675: }
1676: }
1677: }
1678:
1679: #
1680: # Gathered now: all privileges that could apply, and condition number
1681: #
1682: #
1683: # Full or no access?
1684: #
1685:
1686: if ($thisallowed=~/F/) {
1687: return 'F';
1688: }
1689:
1690: unless ($thisallowed) {
1691: return '';
1692: }
1693:
1694: # Restrictions exist, deal with them
1695: #
1696: # C:according to course preferences
1697: # R:according to resource settings
1698: # L:unless locked
1699: # X:according to user session state
1700: #
1701:
1702: # Possibly locked functionality, check all courses
1703: # Locks might take effect only after 10 minutes cache expiration for other
1704: # courses, and 2 minutes for current course
1705:
1706: my $envkey;
1707: if ($thisallowed=~/L/) {
1708: foreach $envkey (keys %ENV) {
1709: if ($envkey=~/^user\.role\.(st|ta)\.([^\.]*)/) {
1710: my $courseid=$2;
1711: my $roleid=$1.'.'.$2;
1712: $courseid=~s/^\///;
1713: my $expiretime=600;
1714: if ($ENV{'request.role'} eq $roleid) {
1715: $expiretime=120;
1716: }
1717: my ($cdom,$cnum,$csec)=split(/\//,$courseid);
1718: my $prefix='course.'.$cdom.'_'.$cnum.'.';
1719: if ((time-$ENV{$prefix.'last_cache'})>$expiretime) {
1720: &coursedescription($courseid);
1721: }
1722: if (($ENV{$prefix.'res.'.$uri.'.lock.sections'}=~/\,$csec\,/)
1723: || ($ENV{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {
1724: if ($ENV{$prefix.'res.'.$uri.'.lock.expire'}>time) {
1725: &log($ENV{'user.domain'},$ENV{'user.name'},
1726: $ENV{'user.home'},
1727: 'Locked by res: '.$priv.' for '.$uri.' due to '.
1728: $cdom.'/'.$cnum.'/'.$csec.' expire '.
1729: $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
1730: return '';
1731: }
1732: }
1733: if (($ENV{$prefix.'priv.'.$priv.'.lock.sections'}=~/\,$csec\,/)
1734: || ($ENV{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {
1735: if ($ENV{'priv.'.$priv.'.lock.expire'}>time) {
1736: &log($ENV{'user.domain'},$ENV{'user.name'},
1737: $ENV{'user.home'},
1738: 'Locked by priv: '.$priv.' for '.$uri.' due to '.
1739: $cdom.'/'.$cnum.'/'.$csec.' expire '.
1740: $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
1741: return '';
1742: }
1743: }
1744: }
1745: }
1746: }
1747:
1748: #
1749: # Rest of the restrictions depend on selected course
1750: #
1751:
1752: unless ($ENV{'request.course.id'}) {
1753: return '1';
1754: }
1755:
1756: #
1757: # Now user is definitely in a course
1758: #
1759:
1760:
1761: # Course preferences
1762:
1763: if ($thisallowed=~/C/) {
1764: my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
1765: my $unamedom=$ENV{'user.name'}.':'.$ENV{'user.domain'};
1766: if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.roles.denied'}
1767: =~/$rolecode/) {
1768: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
1769: 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.
1770: $ENV{'request.course.id'});
1771: return '';
1772: }
1773:
1774: if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.users.denied'}
1775: =~/$unamedom/) {
1776: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
1777: 'Denied by user: '.$priv.' for '.$uri.' as '.$unamedom.' in '.
1778: $ENV{'request.course.id'});
1779: return '';
1780: }
1781: }
1782:
1783: # Resource preferences
1784:
1785: if ($thisallowed=~/R/) {
1786: my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
1787: my $filename=$perlvar{'lonDocRoot'}.'/res/'.$uri.'.meta';
1788: if (-e $filename) {
1789: my @content;
1790: {
1791: my $fh=Apache::File->new($filename);
1792: @content=<$fh>;
1793: }
1794: if (join('',@content)=~
1795: /\<roledeny[^\>]*\>[^\<]*$rolecode[^\<]*\<\/roledeny\>/) {
1796: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
1797: 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);
1798: return '';
1799:
1800: }
1801: }
1802: }
1803:
1804: # Restricted by state or randomout?
1805:
1806: if ($thisallowed=~/X/) {
1807: if ($ENV{'acc.randomout'}) {
1808: my $symb=&symbread($uri,1);
1809: if (($symb) && ($ENV{'acc.randomout'}=~/\&$symb\&/)) {
1810: return '';
1811: }
1812: }
1813: if (&condval($statecond)) {
1814: return '2';
1815: } else {
1816: return '';
1817: }
1818: }
1819:
1820: return 'F';
1821: }
1822:
1823: # --------------------------------------------------- Is a resource on the map?
1824:
1825: sub is_on_map {
1826: my $uri=&declutter(shift);
1827: my @uriparts=split(/\//,$uri);
1828: my $filename=$uriparts[$#uriparts];
1829: my $pathname=$uri;
1830: $pathname=~s/\/$filename$//;
1831: my $match=($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
1832: /\&$filename\:([\d\|]+)\&/);
1833: if ($match) {
1834: return (1,$1);
1835: } else {
1836: return (0,0);
1837: }
1838: }
1839:
1840: # ----------------------------------------------------------------- Define Role
1841:
1842: sub definerole {
1843: if (allowed('mcr','/')) {
1844: my ($rolename,$sysrole,$domrole,$courole)=@_;
1845: foreach (split('/',$sysrole)) {
1846: my ($crole,$cqual)=split(/\&/,$_);
1847: if ($pr{'cr:s'}!~/$crole/) { return "refused:s:$crole"; }
1848: if ($pr{'cr:s'}=~/$crole\&/) {
1849: if ($pr{'cr:s'}!~/$crole\&\w*$cqual/) {
1850: return "refused:s:$crole&$cqual";
1851: }
1852: }
1853: }
1854: foreach (split('/',$domrole)) {
1855: my ($crole,$cqual)=split(/\&/,$_);
1856: if ($pr{'cr:d'}!~/$crole/) { return "refused:d:$crole"; }
1857: if ($pr{'cr:d'}=~/$crole\&/) {
1858: if ($pr{'cr:d'}!~/$crole\&\w*$cqual/) {
1859: return "refused:d:$crole&$cqual";
1860: }
1861: }
1862: }
1863: foreach (split('/',$courole)) {
1864: my ($crole,$cqual)=split(/\&/,$_);
1865: if ($pr{'cr:c'}!~/$crole/) { return "refused:c:$crole"; }
1866: if ($pr{'cr:c'}=~/$crole\&/) {
1867: if ($pr{'cr:c'}!~/$crole\&\w*$cqual/) {
1868: return "refused:c:$crole&$cqual";
1869: }
1870: }
1871: }
1872: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
1873: "$ENV{'user.domain'}:$ENV{'user.name'}:".
1874: "rolesdef_$rolename=".
1875: escape($sysrole.'_'.$domrole.'_'.$courole);
1876: return reply($command,$ENV{'user.home'});
1877: } else {
1878: return 'refused';
1879: }
1880: }
1881:
1882: # ---------------- Make a metadata query against the network of library servers
1883:
1884: sub metadata_query {
1885: my ($query,$custom,$customshow,$server_array)=@_;
1886: my %rhash;
1887: my @server_list = (defined($server_array) ? @$server_array
1888: : keys(%libserv) );
1889: for my $server (@server_list) {
1890: unless ($custom or $customshow) {
1891: my $reply=&reply("querysend:".&escape($query),$server);
1892: $rhash{$server}=$reply;
1893: }
1894: else {
1895: my $reply=&reply("querysend:".&escape($query).':'.
1896: &escape($custom).':'.&escape($customshow),
1897: $server);
1898: $rhash{$server}=$reply;
1899: }
1900: }
1901: return \%rhash;
1902: }
1903:
1904: # ----------------------------------------- Send log queries and wait for reply
1905:
1906: sub log_query {
1907: my ($uname,$udom,$query,%filters)=@_;
1908: my $uhome=&homeserver($uname,$udom);
1909: if ($uhome eq 'no_host') { return 'error: no_host'; }
1910: my $uhost=$hostname{$uhome};
1911: my $command=&escape(join(':',map{$_.'='.$filters{$_}} keys %filters));
1912: my $queryid=&reply("querysend:".$query.':'.$udom.':'.$uname.':'.$command,
1913: $uhome);
1914: unless ($queryid=~/^$uhost\_/) { return 'error: '.$queryid; }
1915: return get_query_reply($queryid);
1916: }
1917:
1918: sub get_query_reply {
1919: my $queryid=shift;
1920: my $replyfile=$perlvar{'lonDaemons'}.'/tmp/'.$queryid;
1921: my $reply='';
1922: for (1..100) {
1923: sleep 2;
1924: if (-e $replyfile.'.end') {
1925: if (my $fh=Apache::File->new($replyfile)) {
1926: $reply.=<$fh>;
1927: $fh->close;
1928: } else { return 'error: reply_file_error'; }
1929: return &unescape($reply);
1930: }
1931: }
1932: return 'timeout:'.$queryid;
1933: }
1934:
1935: sub courselog_query {
1936: #
1937: # possible filters:
1938: # url: url or symb
1939: # username
1940: # domain
1941: # action: view, submit, grade
1942: # start: timestamp
1943: # end: timestamp
1944: #
1945: my (%filters)=@_;
1946: unless ($ENV{'request.course.id'}) { return 'no_course'; }
1947: if ($filters{'url'}) {
1948: $filters{'url'}=&symbclean(&declutter($filters{'url'}));
1949: $filters{'url'}=~s/\.(\w+)$/(\\.\\d+)*\\.$1/;
1950: $filters{'url'}=~s/\.(\w+)\_\_\_/(\\.\\d+)*\\.$1/;
1951: }
1952: my $cname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
1953: my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
1954: return &log_query($cname,$cdom,'courselog',%filters);
1955: }
1956:
1957: sub userlog_query {
1958: my ($uname,$udom,%filters)=@_;
1959: return &log_query($uname,$udom,'userlog',%filters);
1960: }
1961:
1962: # ------------------------------------------------------------------ Plain Text
1963:
1964: sub plaintext {
1965: my $short=shift;
1966: return $prp{$short};
1967: }
1968:
1969: # ----------------------------------------------------------------- Assign Role
1970:
1971: sub assignrole {
1972: my ($udom,$uname,$url,$role,$end,$start)=@_;
1973: my $mrole;
1974: if ($role =~ /^cr\//) {
1975: unless (&allowed('ccr',$url)) {
1976: &logthis('Refused custom assignrole: '.
1977: $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
1978: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
1979: return 'refused';
1980: }
1981: $mrole='cr';
1982: } else {
1983: my $cwosec=$url;
1984: $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
1985: unless (&allowed('c'.$role,$cwosec)) {
1986: &logthis('Refused assignrole: '.
1987: $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
1988: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
1989: return 'refused';
1990: }
1991: $mrole=$role;
1992: }
1993: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
1994: "$udom:$uname:$url".'_'."$mrole=$role";
1995: if ($end) { $command.='_'.$end; }
1996: if ($start) {
1997: if ($end) {
1998: $command.='_'.$start;
1999: } else {
2000: $command.='_0_'.$start;
2001: }
2002: }
2003: return &reply($command,&homeserver($uname,$udom));
2004: }
2005:
2006: # -------------------------------------------------- Modify user authentication
2007: # Overrides without validation
2008:
2009: sub modifyuserauth {
2010: my ($udom,$uname,$umode,$upass)=@_;
2011: my $uhome=&homeserver($uname,$udom);
2012: unless (&allowed('mau',$udom)) { return 'refused'; }
2013: &logthis('Call to modify user authentication '.$udom.', '.$uname.', '.
2014: $umode.' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'});
2015: my $reply=&reply('encrypt:changeuserauth:'.$udom.':'.$uname.':'.$umode.':'.
2016: &escape($upass),$uhome);
2017: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},
2018: 'Authentication changed for '.$udom.', '.$uname.', '.$umode.
2019: '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
2020: &log($udom,,$uname,$uhome,
2021: 'Authentication changed by '.$ENV{'user.domain'}.', '.
2022: $ENV{'user.name'}.', '.$umode.
2023: '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
2024: unless ($reply eq 'ok') {
2025: &logthis('Authentication mode error: '.$reply);
2026: return 'error: '.$reply;
2027: }
2028: return 'ok';
2029: }
2030:
2031: # --------------------------------------------------------------- Modify a user
2032:
2033: sub modifyuser {
2034: my ($udom, $uname, $uid,
2035: $umode, $upass, $first,
2036: $middle, $last, $gene,
2037: $forceid, $desiredhome)=@_;
2038: $udom=~s/\W//g;
2039: $uname=~s/\W//g;
2040: &logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.
2041: $umode.', '.$first.', '.$middle.', '.
2042: $last.', '.$gene.'(forceid: '.$forceid.')'.
2043: (defined($desiredhome) ? ' desiredhome = '.$desiredhome :
2044: ' desiredhome not specified').
2045: ' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'});
2046: my $uhome=&homeserver($uname,$udom,'true');
2047: # ----------------------------------------------------------------- Create User
2048: if (($uhome eq 'no_host') && ($umode) && ($upass)) {
2049: my $unhome='';
2050: if (defined($desiredhome) && $hostdom{$desiredhome} eq $udom) {
2051: $unhome = $desiredhome;
2052: } elsif($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $udom) {
2053: $unhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
2054: } else { # load balancing routine for determining $unhome
2055: my $tryserver;
2056: my $loadm=10000000;
2057: foreach $tryserver (keys %libserv) {
2058: if ($hostdom{$tryserver} eq $udom) {
2059: my $answer=reply('load',$tryserver);
2060: if (($answer=~/\d+/) && ($answer<$loadm)) {
2061: $loadm=$answer;
2062: $unhome=$tryserver;
2063: }
2064: }
2065: }
2066: }
2067: if (($unhome eq '') || ($unhome eq 'no_host')) {
2068: return 'error: unable to find a home server for '.$uname.
2069: ' in domain '.$udom;
2070: }
2071: my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':'.$umode.':'.
2072: &escape($upass),$unhome);
2073: unless ($reply eq 'ok') {
2074: return 'error: '.$reply;
2075: }
2076: $uhome=&homeserver($uname,$udom,'true');
2077: if (($uhome eq '') || ($uhome eq 'no_host') || ($uhome ne $unhome)) {
2078: return 'error: verify home';
2079: }
2080: } # End of creation of new user
2081: # ---------------------------------------------------------------------- Add ID
2082: if ($uid) {
2083: $uid=~tr/A-Z/a-z/;
2084: my %uidhash=&idrget($udom,$uname);
2085: if (($uidhash{$uname}) && ($uidhash{$uname}!~/error\:/)
2086: && (!$forceid)) {
2087: unless ($uid eq $uidhash{$uname}) {
2088: return 'error: mismatch '.$uidhash{$uname}.' versus '.$uid;
2089: }
2090: } else {
2091: &idput($udom,($uname => $uid));
2092: }
2093: }
2094: # -------------------------------------------------------------- Add names, etc
2095: my %names=&get('environment',
2096: ['firstname','middlename','lastname','generation'],
2097: $udom,$uname);
2098: if ($names{'firstname'} =~ m/^error:.*/) { %names=(); }
2099: if ($first) { $names{'firstname'} = $first; }
2100: if ($middle) { $names{'middlename'} = $middle; }
2101: if ($last) { $names{'lastname'} = $last; }
2102: if ($gene) { $names{'generation'} = $gene; }
2103: my $reply = &put('environment', \%names, $udom,$uname);
2104: if ($reply ne 'ok') { return 'error: '.$reply; }
2105: &logthis('Success modifying user '.$udom.', '.$uname.', '.$uid.', '.
2106: $umode.', '.$first.', '.$middle.', '.
2107: $last.', '.$gene.' by '.
2108: $ENV{'user.name'}.' at '.$ENV{'user.domain'});
2109: return 'ok';
2110: }
2111:
2112: # -------------------------------------------------------------- Modify student
2113:
2114: sub modifystudent {
2115: my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,
2116: $end,$start,$forceid,$desiredhome)=@_;
2117: my $cid='';
2118: unless ($cid=$ENV{'request.course.id'}) {
2119: return 'not_in_class';
2120: }
2121: # --------------------------------------------------------------- Make the user
2122: my $reply=&modifyuser
2123: ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$forceid,
2124: $desiredhome);
2125: unless ($reply eq 'ok') { return $reply; }
2126: my $uhome=&homeserver($uname,$udom);
2127: if (($uhome eq '') || ($uhome eq 'no_host')) {
2128: return 'error: no such user';
2129: }
2130: # -------------------------------------------------- Add student to course list
2131: $reply=critical('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
2132: $ENV{'course.'.$cid.'.num'}.':classlist:'.
2133: &escape($uname.':'.$udom).'='.
2134: &escape($end.':'.$start),
2135: $ENV{'course.'.$cid.'.home'});
2136: unless (($reply eq 'ok') || ($reply eq 'delayed')) {
2137: return 'error: '.$reply;
2138: }
2139: # ---------------------------------------------------- Add student role to user
2140: my $uurl='/'.$cid;
2141: $uurl=~s/\_/\//g;
2142: if ($usec) {
2143: $uurl.='/'.$usec;
2144: }
2145: return &assignrole($udom,$uname,$uurl,'st',$end,$start);
2146: }
2147:
2148: # ------------------------------------------------- Write to course preferences
2149:
2150: sub writecoursepref {
2151: my ($courseid,%prefs)=@_;
2152: $courseid=~s/^\///;
2153: $courseid=~s/\_/\//g;
2154: my ($cdomain,$cnum)=split(/\//,$courseid);
2155: my $chome=homeserver($cnum,$cdomain);
2156: if (($chome eq '') || ($chome eq 'no_host')) {
2157: return 'error: no such course';
2158: }
2159: my $cstring='';
2160: foreach (keys %prefs) {
2161: $cstring.=escape($_).'='.escape($prefs{$_}).'&';
2162: }
2163: $cstring=~s/\&$//;
2164: return reply('put:'.$cdomain.':'.$cnum.':environment:'.$cstring,$chome);
2165: }
2166:
2167: # ---------------------------------------------------------- Make/modify course
2168:
2169: sub createcourse {
2170: my ($udom,$description,$url)=@_;
2171: $url=&declutter($url);
2172: my $cid='';
2173: unless (&allowed('ccc',$ENV{'user.domain'})) {
2174: return 'refused';
2175: }
2176: unless ($udom eq $ENV{'user.domain'}) {
2177: return 'refused';
2178: }
2179: # ------------------------------------------------------------------- Create ID
2180: my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
2181: unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
2182: # ----------------------------------------------- Make sure that does not exist
2183: my $uhome=&homeserver($uname,$udom,'true');
2184: unless (($uhome eq '') || ($uhome eq 'no_host')) {
2185: $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
2186: unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
2187: $uhome=&homeserver($uname,$udom,'true');
2188: unless (($uhome eq '') || ($uhome eq 'no_host')) {
2189: return 'error: unable to generate unique course-ID';
2190: }
2191: }
2192: # ------------------------------------------------------------- Make the course
2193: my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
2194: $ENV{'user.home'});
2195: unless ($reply eq 'ok') { return 'error: '.$reply; }
2196: $uhome=&homeserver($uname,$udom,'true');
2197: if (($uhome eq '') || ($uhome eq 'no_host')) {
2198: return 'error: no such course';
2199: }
2200: &writecoursepref($udom.'_'.$uname,
2201: ('description' => $description,
2202: 'url' => $url));
2203: return '/'.$udom.'/'.$uname;
2204: }
2205:
2206: # ---------------------------------------------------------- Assign Custom Role
2207:
2208: sub assigncustomrole {
2209: my ($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start)=@_;
2210: return &assignrole($udom,$uname,$url,'cr/'.$rdom.'/'.$rnam.'/'.$rolename,
2211: $end,$start);
2212: }
2213:
2214: # ----------------------------------------------------------------- Revoke Role
2215:
2216: sub revokerole {
2217: my ($udom,$uname,$url,$role)=@_;
2218: my $now=time;
2219: return &assignrole($udom,$uname,$url,$role,$now);
2220: }
2221:
2222: # ---------------------------------------------------------- Revoke Custom Role
2223:
2224: sub revokecustomrole {
2225: my ($udom,$uname,$url,$rdom,$rnam,$rolename)=@_;
2226: my $now=time;
2227: return &assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$now);
2228: }
2229:
2230: # ------------------------------------------------------------ Directory lister
2231:
2232: sub dirlist {
2233: my ($uri,$userdomain,$username,$alternateDirectoryRoot)=@_;
2234:
2235: $uri=~s/^\///;
2236: $uri=~s/\/$//;
2237: my ($udom, $uname);
2238: (undef,$udom,$uname)=split(/\//,$uri);
2239: if(defined($userdomain)) {
2240: $udom = $userdomain;
2241: }
2242: if(defined($username)) {
2243: $uname = $username;
2244: }
2245:
2246: my $dirRoot = $perlvar{'lonDocRoot'};
2247: if(defined($alternateDirectoryRoot)) {
2248: $dirRoot = $alternateDirectoryRoot;
2249: $dirRoot =~ s/\/$//;
2250: }
2251:
2252: if($udom) {
2253: if($uname) {
2254: my $listing=reply('ls:'.$dirRoot.'/'.$uri,
2255: homeserver($uname,$udom));
2256: return split(/:/,$listing);
2257: } elsif(!defined($alternateDirectoryRoot)) {
2258: my $tryserver;
2259: my %allusers=();
2260: foreach $tryserver (keys %libserv) {
2261: if($hostdom{$tryserver} eq $udom) {
2262: my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.
2263: $udom, $tryserver);
2264: if (($listing ne 'no_such_dir') && ($listing ne 'empty')
2265: && ($listing ne 'con_lost')) {
2266: foreach (split(/:/,$listing)) {
2267: my ($entry,@stat)=split(/&/,$_);
2268: $allusers{$entry}=1;
2269: }
2270: }
2271: }
2272: }
2273: my $alluserstr='';
2274: foreach (sort keys %allusers) {
2275: $alluserstr.=$_.'&user:';
2276: }
2277: $alluserstr=~s/:$//;
2278: return split(/:/,$alluserstr);
2279: } else {
2280: my @emptyResults = ();
2281: push(@emptyResults, 'missing user name');
2282: return split(':',@emptyResults);
2283: }
2284: } elsif(!defined($alternateDirectoryRoot)) {
2285: my $tryserver;
2286: my %alldom=();
2287: foreach $tryserver (keys %libserv) {
2288: $alldom{$hostdom{$tryserver}}=1;
2289: }
2290: my $alldomstr='';
2291: foreach (sort keys %alldom) {
2292: $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
2293: }
2294: $alldomstr=~s/:$//;
2295: return split(/:/,$alldomstr);
2296: } else {
2297: my @emptyResults = ();
2298: push(@emptyResults, 'missing domain');
2299: return split(':',@emptyResults);
2300: }
2301: }
2302:
2303: # -------------------------------------------------------- Value of a Condition
2304:
2305: sub directcondval {
2306: my $number=shift;
2307: if ($ENV{'user.state.'.$ENV{'request.course.id'}}) {
2308: return substr($ENV{'user.state.'.$ENV{'request.course.id'}},$number,1);
2309: } else {
2310: return 2;
2311: }
2312: }
2313:
2314: sub condval {
2315: my $condidx=shift;
2316: my $result=0;
2317: my $allpathcond='';
2318: foreach (split(/\|/,$condidx)) {
2319: if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_})) {
2320: $allpathcond.=
2321: '('.$ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_}.')|';
2322: }
2323: }
2324: $allpathcond=~s/\|$//;
2325: if ($ENV{'request.course.id'}) {
2326: if ($allpathcond) {
2327: my $operand='|';
2328: my @stack;
2329: foreach ($allpathcond=~/(\d+|\(|\)|\&|\|)/g) {
2330: if ($_ eq '(') {
2331: push @stack,($operand,$result)
2332: } elsif ($_ eq ')') {
2333: my $before=pop @stack;
2334: if (pop @stack eq '&') {
2335: $result=$result>$before?$before:$result;
2336: } else {
2337: $result=$result>$before?$result:$before;
2338: }
2339: } elsif (($_ eq '&') || ($_ eq '|')) {
2340: $operand=$_;
2341: } else {
2342: my $new=directcondval($_);
2343: if ($operand eq '&') {
2344: $result=$result>$new?$new:$result;
2345: } else {
2346: $result=$result>$new?$result:$new;
2347: }
2348: }
2349: }
2350: }
2351: }
2352: return $result;
2353: }
2354:
2355: # --------------------------------------------------- Course Resourcedata Query
2356:
2357: sub courseresdata {
2358: my ($coursenum,$coursedomain,@which)=@_;
2359: my $coursehom=&homeserver($coursenum,$coursedomain);
2360: my $hashid=$coursenum.':'.$coursedomain;
2361: my $dodump=0;
2362: if (!defined($courseresdatacache{$hashid.'.time'})) {
2363: $dodump=1;
2364: } else {
2365: if (time-$courseresdatacache{$hashid.'.time'}>300) { $dodump=1; }
2366: }
2367: if ($dodump) {
2368: my %dumpreply=&dump('resourcedata',$coursedomain,$coursenum);
2369: my ($tmp) = keys(%dumpreply);
2370: if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
2371: $courseresdatacache{$hashid.'.time'}=time;
2372: $courseresdatacache{$hashid}=\%dumpreply;
2373: }
2374: }
2375: foreach my $item (@which) {
2376: if ($courseresdatacache{$hashid}->{$item}) {
2377: return $courseresdatacache{$hashid}->{$item};
2378: }
2379: }
2380: return '';
2381: }
2382:
2383: # --------------------------------------------------------- Value of a Variable
2384:
2385: sub EXT {
2386: my ($varname,$symbparm,$udom,$uname)=@_;
2387:
2388: unless ($varname) { return ''; }
2389:
2390: #get real user name/domain, courseid and symb
2391: my $courseid;
2392: if (!($uname && $udom)) {
2393: (my $cursymb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
2394: if (!$symbparm) { $symbparm=$cursymb; }
2395: } else {
2396: $courseid=$ENV{'request.course.id'};
2397: }
2398:
2399: my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
2400: my $rest;
2401: if ($therest[0]) {
2402: $rest=join('.',@therest);
2403: } else {
2404: $rest='';
2405: }
2406: my $qualifierrest=$qualifier;
2407: if ($rest) { $qualifierrest.='.'.$rest; }
2408: my $spacequalifierrest=$space;
2409: if ($qualifierrest) { $spacequalifierrest.='.'.$qualifierrest; }
2410: if ($realm eq 'user') {
2411: # --------------------------------------------------------------- user.resource
2412: if ($space eq 'resource') {
2413: my %restored=&restore(undef,undef,$udom,$uname);
2414: return $restored{$qualifierrest};
2415: # ----------------------------------------------------------------- user.access
2416: } elsif ($space eq 'access') {
2417: # FIXME - not supporting calls for a specific user
2418: return &allowed($qualifier,$rest);
2419: # ------------------------------------------ user.preferences, user.environment
2420: } elsif (($space eq 'preferences') || ($space eq 'environment')) {
2421: if (($uname eq $ENV{'user.name'}) &&
2422: ($udom eq $ENV{'user.domain'})) {
2423: return $ENV{join('.',('environment',$qualifierrest))};
2424: } else {
2425: my %returnhash=&userenvironment($udom,$uname,$qualifierrest);
2426: return $returnhash{$qualifierrest};
2427: }
2428: # ----------------------------------------------------------------- user.course
2429: } elsif ($space eq 'course') {
2430: # FIXME - not supporting calls for a specific user
2431: return $ENV{join('.',('request.course',$qualifier))};
2432: # ------------------------------------------------------------------- user.role
2433: } elsif ($space eq 'role') {
2434: # FIXME - not supporting calls for a specific user
2435: my ($role,$where)=split(/\./,$ENV{'request.role'});
2436: if ($qualifier eq 'value') {
2437: return $role;
2438: } elsif ($qualifier eq 'extent') {
2439: return $where;
2440: }
2441: # ----------------------------------------------------------------- user.domain
2442: } elsif ($space eq 'domain') {
2443: return $udom;
2444: # ------------------------------------------------------------------- user.name
2445: } elsif ($space eq 'name') {
2446: return $uname;
2447: # ---------------------------------------------------- Any other user namespace
2448: } else {
2449: my $item=($rest)?$qualifier.'.'.$rest:$qualifier;
2450: my %reply=&get($space,[$item]);
2451: return $reply{$item};
2452: }
2453: } elsif ($realm eq 'query') {
2454: # ---------------------------------------------- pull stuff out of query string
2455: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},[$space]);
2456: return $ENV{'form.'.$space};
2457: } elsif ($realm eq 'request') {
2458: # ------------------------------------------------------------- request.browser
2459: if ($space eq 'browser') {
2460: return $ENV{'browser.'.$qualifier};
2461: # ------------------------------------------------------------ request.filename
2462: } else {
2463: return $ENV{'request.'.$spacequalifierrest};
2464: }
2465: } elsif ($realm eq 'course') {
2466: # ---------------------------------------------------------- course.description
2467: return $ENV{'course.'.$courseid.'.'.$spacequalifierrest};
2468: } elsif ($realm eq 'resource') {
2469:
2470: if ($courseid eq $ENV{'request.course.id'}) {
2471:
2472: #print '<br>'.$space.' - '.$qualifier.' - '.$spacequalifierrest;
2473:
2474: # ----------------------------------------------------- Cascading lookup scheme
2475: if (!$symbparm) { $symbparm=&symbread(); }
2476: my $symbp=$symbparm;
2477: my $mapp=(split(/\_\_\_/,$symbp))[0];
2478:
2479: my $symbparm=$symbp.'.'.$spacequalifierrest;
2480: my $mapparm=$mapp.'___(all).'.$spacequalifierrest;
2481:
2482: my $section;
2483: if (($ENV{'user.name'} eq $uname) &&
2484: ($ENV{'user.domain'} eq $udom)) {
2485: $section=$ENV{'request.course.sec'};
2486: } else {
2487: $section=&usection($udom,$uname,$courseid);
2488: }
2489:
2490: my $seclevel=$courseid.'.['.$section.'].'.$spacequalifierrest;
2491: my $seclevelr=$courseid.'.['.$section.'].'.$symbparm;
2492: my $seclevelm=$courseid.'.['.$section.'].'.$mapparm;
2493:
2494: my $courselevel=$courseid.'.'.$spacequalifierrest;
2495: my $courselevelr=$courseid.'.'.$symbparm;
2496: my $courselevelm=$courseid.'.'.$mapparm;
2497:
2498: # ----------------------------------------------------------- first, check user
2499: my %resourcedata=&get('resourcedata',
2500: [$courselevelr,$courselevelm,$courselevel],
2501: $udom,$uname);
2502: if (($resourcedata{$courselevelr}!~/^error\:/) &&
2503: ($resourcedata{$courselevelr}!~/^con_lost/)) {
2504:
2505: if ($resourcedata{$courselevelr}) {
2506: return $resourcedata{$courselevelr}; }
2507: if ($resourcedata{$courselevelm}) {
2508: return $resourcedata{$courselevelm}; }
2509: if ($resourcedata{$courselevel}) {
2510: return $resourcedata{$courselevel}; }
2511: } else {
2512: if ($resourcedata{$courselevelr}!~/No such file/) {
2513: &logthis("<font color=blue>WARNING:".
2514: " Trying to get resource data for ".
2515: $uname." at ".$udom.": ".
2516: $resourcedata{$courselevelr}."</font>");
2517: }
2518: }
2519:
2520: # -------------------------------------------------------- second, check course
2521:
2522: my $coursereply=&courseresdata($ENV{'course.'.$courseid.'.num'},
2523: $ENV{'course.'.$courseid.'.domain'},
2524: ($seclevelr,$seclevelm,$seclevel,
2525: $courselevelr,$courselevelm,
2526: $courselevel));
2527: if ($coursereply) { return $coursereply; }
2528:
2529: # ------------------------------------------------------ third, check map parms
2530: my %parmhash=();
2531: my $thisparm='';
2532: if (tie(%parmhash,'GDBM_File',
2533: $ENV{'request.course.fn'}.'_parms.db',
2534: &GDBM_READER(),0640)) {
2535: $thisparm=$parmhash{$symbparm};
2536: untie(%parmhash);
2537: }
2538: if ($thisparm) { return $thisparm; }
2539: }
2540: # --------------------------------------------- last, look in resource metadata
2541:
2542: $spacequalifierrest=~s/\./\_/;
2543: my $metadata=&metadata($ENV{'request.filename'},$spacequalifierrest);
2544: if ($metadata) { return $metadata; }
2545: $metadata=&metadata($ENV{'request.filename'},
2546: 'parameter_'.$spacequalifierrest);
2547: if ($metadata) { return $metadata; }
2548:
2549: # ------------------------------------------------------------------ Cascade up
2550: unless ($space eq '0') {
2551: my ($part,$id)=split(/\_/,$space);
2552: if ($id) {
2553: my $partgeneral=&EXT('resource.'.$part.'.'.$qualifierrest,
2554: $symbparm,$udom,$uname);
2555: if ($partgeneral) { return $partgeneral; }
2556: } else {
2557: my $resourcegeneral=&EXT('resource.0.'.$qualifierrest,
2558: $symbparm,$udom,$uname);
2559: if ($resourcegeneral) { return $resourcegeneral; }
2560: }
2561: }
2562:
2563: # ---------------------------------------------------- Any other user namespace
2564: } elsif ($realm eq 'environment') {
2565: # ----------------------------------------------------------------- environment
2566: if (($uname eq $ENV{'user.name'})&&($udom eq $ENV{'user.domain'})) {
2567: return $ENV{'environment.'.$spacequalifierrest};
2568: } else {
2569: my %returnhash=&userenvironment($udom,$uname,
2570: $spacequalifierrest);
2571: return $returnhash{$spacequalifierrest};
2572: }
2573: } elsif ($realm eq 'system') {
2574: # ----------------------------------------------------------------- system.time
2575: if ($space eq 'time') {
2576: return time;
2577: }
2578: }
2579: return '';
2580: }
2581:
2582: # ---------------------------------------------------------------- Get metadata
2583:
2584: sub metadata {
2585: my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
2586:
2587: $uri=&declutter($uri);
2588: my $filename=$uri;
2589: $uri=~s/\.meta$//;
2590: #
2591: # Is the metadata already cached?
2592: # Look at timestamp of caching
2593: # Everything is cached by the main uri, libraries are never directly cached
2594: #
2595: unless (abs($metacache{$uri.':cachedtimestamp'}-time)<600) {
2596: #
2597: # Is this a recursive call for a library?
2598: #
2599: if ($liburi) {
2600: $liburi=&declutter($liburi);
2601: $filename=$liburi;
2602: }
2603: my %metathesekeys=();
2604: unless ($filename=~/\.meta$/) { $filename.='.meta'; }
2605: my $metastring=&getfile($perlvar{'lonDocRoot'}.'/res/'.$filename);
2606: my $parser=HTML::LCParser->new(\$metastring);
2607: my $token;
2608: undef %metathesekeys;
2609: while ($token=$parser->get_token) {
2610: if ($token->[0] eq 'S') {
2611: if (defined($token->[2]->{'package'})) {
2612: #
2613: # This is a package - get package info
2614: #
2615: my $package=$token->[2]->{'package'};
2616: my $keyroot='';
2617: if ($prefix) {
2618: $keyroot.='_'.$prefix;
2619: } else {
2620: if (defined($token->[2]->{'part'})) {
2621: $keyroot.='_'.$token->[2]->{'part'};
2622: }
2623: }
2624: if (defined($token->[2]->{'id'})) {
2625: $keyroot.='_'.$token->[2]->{'id'};
2626: }
2627: if ($metacache{$uri.':packages'}) {
2628: $metacache{$uri.':packages'}.=','.$package.$keyroot;
2629: } else {
2630: $metacache{$uri.':packages'}=$package.$keyroot;
2631: }
2632: foreach (keys %packagetab) {
2633: if ($_=~/^$package\&/) {
2634: my ($pack,$name,$subp)=split(/\&/,$_);
2635: my $value=$packagetab{$_};
2636: my $part=$keyroot;
2637: $part=~s/^\_//;
2638: if ($subp eq 'display') {
2639: $value.=' [Part: '.$part.']';
2640: }
2641: my $unikey='parameter'.$keyroot.'_'.$name;
2642: $metathesekeys{$unikey}=1;
2643: $metacache{$uri.':'.$unikey.'.part'}=$part;
2644: unless
2645: (defined($metacache{$uri.':'.$unikey.'.'.$subp})) {
2646: $metacache{$uri.':'.$unikey.'.'.$subp}=$value;
2647: }
2648: }
2649: }
2650: } else {
2651: #
2652: # This is not a package - some other kind of start tag
2653: #
2654: my $entry=$token->[1];
2655: my $unikey;
2656: if ($entry eq 'import') {
2657: $unikey='';
2658: } else {
2659: $unikey=$entry;
2660: }
2661: if ($prefix) {
2662: $unikey.=$prefix;
2663: } else {
2664: if (defined($token->[2]->{'part'})) {
2665: $unikey.='_'.$token->[2]->{'part'};
2666: }
2667: }
2668: if (defined($token->[2]->{'id'})) {
2669: $unikey.='_'.$token->[2]->{'id'};
2670: }
2671:
2672: if ($entry eq 'import') {
2673: #
2674: # Importing a library here
2675: #
2676: if (defined($depthcount)) { $depthcount++; } else
2677: { $depthcount=0; }
2678: if ($depthcount<20) {
2679: foreach (split(/\,/,&metadata($uri,'keys',
2680: $parser->get_text('/import'),$unikey,
2681: $depthcount))) {
2682: $metathesekeys{$_}=1;
2683: }
2684: }
2685: } else {
2686:
2687: if (defined($token->[2]->{'name'})) {
2688: $unikey.='_'.$token->[2]->{'name'};
2689: }
2690: $metathesekeys{$unikey}=1;
2691: foreach (@{$token->[3]}) {
2692: $metacache{$uri.':'.$unikey.'.'.$_}=$token->[2]->{$_};
2693: }
2694: unless (
2695: $metacache{$uri.':'.$unikey}=&HTML::Entities::decode($parser->get_text('/'.$entry))
2696: ) { $metacache{$uri.':'.$unikey}=
2697: $metacache{$uri.':'.$unikey.'.default'};
2698: }
2699: # end of not-a-package not-a-library import
2700: }
2701: # end of not-a-package start tag
2702: }
2703: # the next is the end of "start tag"
2704: }
2705: }
2706: $metacache{$uri.':keys'}=join(',',keys %metathesekeys);
2707: $metacache{$uri.':cachedtimestamp'}=time;
2708: # this is the end of "was not already recently cached
2709: }
2710: return $metacache{$uri.':'.$what};
2711: }
2712:
2713: # ------------------------------------------------- Update symbolic store links
2714:
2715: sub symblist {
2716: my ($mapname,%newhash)=@_;
2717: $mapname=declutter($mapname);
2718: my %hash;
2719: if (($ENV{'request.course.fn'}) && (%newhash)) {
2720: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
2721: &GDBM_WRCREAT(),0640)) {
2722: foreach (keys %newhash) {
2723: $hash{declutter($_)}=$mapname.'___'.$newhash{$_};
2724: }
2725: if (untie(%hash)) {
2726: return 'ok';
2727: }
2728: }
2729: }
2730: return 'error';
2731: }
2732:
2733: # --------------------------------------------------------------- Verify a symb
2734:
2735: sub symbverify {
2736: my ($symb,$thisfn)=@_;
2737: $thisfn=&declutter($thisfn);
2738: # direct jump to resource in page or to a sequence - will construct own symbs
2739: if ($thisfn=~/\.(page|sequence)$/) { return 1; }
2740: # check URL part
2741: my ($map,$resid,$url)=split(/\_\_\_/,$symb);
2742: unless (&symbclean($url) eq &symbclean($thisfn)) { return 0; }
2743:
2744: $symb=&symbclean($symb);
2745:
2746: my %bighash;
2747: my $okay=0;
2748: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
2749: &GDBM_READER(),0640)) {
2750: my $ids=$bighash{'ids_/res/'.$thisfn};
2751: unless ($ids) {
2752: $ids=$bighash{'ids_/'.$thisfn};
2753: }
2754: if ($ids) {
2755: # ------------------------------------------------------------------- Has ID(s)
2756: foreach (split(/\,/,$ids)) {
2757: my ($mapid,$resid)=split(/\./,$_);
2758: if (
2759: &symbclean(&declutter($bighash{'map_id_'.$mapid}).'___'.$resid.'___'.$thisfn)
2760: eq $symb) {
2761: $okay=1;
2762: }
2763: }
2764: }
2765: untie(%bighash);
2766: }
2767: return $okay;
2768: }
2769:
2770: # --------------------------------------------------------------- Clean-up symb
2771:
2772: sub symbclean {
2773: my $symb=shift;
2774:
2775: # remove version from map
2776: $symb=~s/\.(\d+)\.(\w+)\_\_\_/\.$2\_\_\_/;
2777:
2778: # remove version from URL
2779: $symb=~s/\.(\d+)\.(\w+)$/\.$2/;
2780:
2781: return $symb;
2782: }
2783:
2784: # ------------------------------------------------------ Return symb list entry
2785:
2786: sub symbread {
2787: my ($thisfn,$donotrecurse)=@_;
2788: # no filename provided? try from environment
2789: unless ($thisfn) {
2790: if ($ENV{'request.symb'}) { return &symbclean($ENV{'request.symb'}); }
2791: $thisfn=$ENV{'request.filename'};
2792: }
2793: # is that filename actually a symb? Verify, clean, and return
2794: if ($thisfn=~/\_\_\_\d+\_\_\_(.*)$/) {
2795: if (&symbverify($thisfn,$1)) { return &symbclean($thisfn); }
2796: }
2797: $thisfn=declutter($thisfn);
2798: my %hash;
2799: my %bighash;
2800: my $syval='';
2801: if (($ENV{'request.course.fn'}) && ($thisfn)) {
2802: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
2803: &GDBM_READER(),0640)) {
2804: $syval=$hash{$thisfn};
2805: untie(%hash);
2806: }
2807: # ---------------------------------------------------------- There was an entry
2808: if ($syval) {
2809: unless ($syval=~/\_\d+$/) {
2810: unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {
2811: &appenv('request.ambiguous' => $thisfn);
2812: return '';
2813: }
2814: $syval.=$1;
2815: }
2816: } else {
2817: # ------------------------------------------------------- Was not in symb table
2818: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
2819: &GDBM_READER(),0640)) {
2820: # ---------------------------------------------- Get ID(s) for current resource
2821: my $ids=$bighash{'ids_/res/'.$thisfn};
2822: unless ($ids) {
2823: $ids=$bighash{'ids_/'.$thisfn};
2824: }
2825: unless ($ids) {
2826: # alias?
2827: $ids=$bighash{'mapalias_'.$thisfn};
2828: }
2829: if ($ids) {
2830: # ------------------------------------------------------------------- Has ID(s)
2831: my @possibilities=split(/\,/,$ids);
2832: if ($#possibilities==0) {
2833: # ----------------------------------------------- There is only one possibility
2834: my ($mapid,$resid)=split(/\./,$ids);
2835: $syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;
2836: } elsif (!$donotrecurse) {
2837: # ------------------------------------------ There is more than one possibility
2838: my $realpossible=0;
2839: foreach (@possibilities) {
2840: my $file=$bighash{'src_'.$_};
2841: if (&allowed('bre',$file)) {
2842: my ($mapid,$resid)=split(/\./,$_);
2843: if ($bighash{'map_type_'.$mapid} ne 'page') {
2844: $realpossible++;
2845: $syval=declutter($bighash{'map_id_'.$mapid}).
2846: '___'.$resid;
2847: }
2848: }
2849: }
2850: if ($realpossible!=1) { $syval=''; }
2851: } else {
2852: $syval='';
2853: }
2854: }
2855: untie(%bighash)
2856: }
2857: }
2858: if ($syval) {
2859: return &symbclean($syval.'___'.$thisfn);
2860: }
2861: }
2862: &appenv('request.ambiguous' => $thisfn);
2863: return '';
2864: }
2865:
2866: # ---------------------------------------------------------- Return random seed
2867:
2868: sub numval {
2869: my $txt=shift;
2870: $txt=~tr/A-J/0-9/;
2871: $txt=~tr/a-j/0-9/;
2872: $txt=~tr/K-T/0-9/;
2873: $txt=~tr/k-t/0-9/;
2874: $txt=~tr/U-Z/0-5/;
2875: $txt=~tr/u-z/0-5/;
2876: $txt=~s/\D//g;
2877: return int($txt);
2878: }
2879:
2880: sub rndseed {
2881: my ($symb,$courseid,$domain,$username)=@_;
2882: if (!$symb) {
2883: unless ($symb=&symbread()) { return time; }
2884: }
2885: if (!$courseid) { $courseid=$ENV{'request.course.id'};}
2886: if (!$domain) {$domain=$ENV{'user.domain'};}
2887: if (!$username) {$username=$ENV{'user.name'};}
2888: {
2889: use integer;
2890: my $symbchck=unpack("%32C*",$symb) << 27;
2891: my $symbseed=numval($symb) << 22;
2892: my $namechck=unpack("%32C*",$username) << 17;
2893: my $nameseed=numval($username) << 12;
2894: my $domainseed=unpack("%32C*",$domain) << 7;
2895: my $courseseed=unpack("%32C*",$courseid);
2896: my $num=$symbseed+$nameseed+$domainseed+$courseseed+$namechck+$symbchck;
2897: #uncommenting these lines can break things!
2898: #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
2899: #&Apache::lonxml::debug("rndseed :$num:$symb");
2900: return $num;
2901: }
2902: }
2903:
2904: sub ireceipt {
2905: my ($funame,$fudom,$fucourseid,$fusymb)=@_;
2906: my $cuname=unpack("%32C*",$funame);
2907: my $cudom=unpack("%32C*",$fudom);
2908: my $cucourseid=unpack("%32C*",$fucourseid);
2909: my $cusymb=unpack("%32C*",$fusymb);
2910: my $cunique=unpack("%32C*",$perlvar{'lonReceipt'});
2911: return unpack("%32C*",$perlvar{'lonHostID'}).'-'.
2912: ($cunique%$cuname+
2913: $cunique%$cudom+
2914: $cusymb%$cuname+
2915: $cusymb%$cudom+
2916: $cucourseid%$cuname+
2917: $cucourseid%$cudom);
2918: }
2919:
2920: sub receipt {
2921: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
2922: return &ireceipt($name,$domain,$courseid,$symb);
2923: }
2924:
2925: # ------------------------------------------------------------ Serves up a file
2926: # returns either the contents of the file or a -1
2927: sub getfile {
2928: my $file=shift;
2929: &repcopy($file);
2930: if (! -e $file ) { return -1; };
2931: my $fh=Apache::File->new($file);
2932: my $a='';
2933: while (<$fh>) { $a .=$_; }
2934: return $a
2935: }
2936:
2937: sub filelocation {
2938: my ($dir,$file) = @_;
2939: my $location;
2940: $file=~ s/^\s*(\S+)\s*$/$1/; ## strip off leading and trailing spaces
2941: if ($file=~m:^/~:) { # is a contruction space reference
2942: $location = $file;
2943: $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
2944: } else {
2945: $file=~s/^$perlvar{'lonDocRoot'}//;
2946: $file=~s:^/*res::;
2947: if ( !( $file =~ m:^/:) ) {
2948: $location = $dir. '/'.$file;
2949: } else {
2950: $location = '/home/httpd/html/res'.$file;
2951: }
2952: }
2953: $location=~s://+:/:g; # remove duplicate /
2954: while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
2955: return $location;
2956: }
2957:
2958: sub hreflocation {
2959: my ($dir,$file)=@_;
2960: unless (($file=~/^http:\/\//i) || ($file=~/^\//)) {
2961: my $finalpath=filelocation($dir,$file);
2962: $finalpath=~s/^\/home\/httpd\/html//;
2963: $finalpath=~s-/home/(\w+)/public_html/-/~$1/-;
2964: return $finalpath;
2965: } else {
2966: return $file;
2967: }
2968: }
2969:
2970: # ------------------------------------------------------------- Declutters URLs
2971:
2972: sub declutter {
2973: my $thisfn=shift;
2974: $thisfn=~s/^$perlvar{'lonDocRoot'}//;
2975: $thisfn=~s/^\///;
2976: $thisfn=~s/^res\///;
2977: $thisfn=~s/\?.+$//;
2978: return $thisfn;
2979: }
2980:
2981: # -------------------------------------------------------- Escape Special Chars
2982:
2983: sub escape {
2984: my $str=shift;
2985: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
2986: return $str;
2987: }
2988:
2989: # ----------------------------------------------------- Un-Escape Special Chars
2990:
2991: sub unescape {
2992: my $str=shift;
2993: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
2994: return $str;
2995: }
2996:
2997: # ================================================================ Main Program
2998:
2999: sub goodbye {
3000: &logthis("Starting Shut down");
3001: &flushcourselogs();
3002: &logthis("Shutting down");
3003: }
3004:
3005: BEGIN {
3006: # ----------------------------------- Read loncapa.conf and loncapa_apache.conf
3007: unless ($readit) {
3008: {
3009: my $config=Apache::File->new("/etc/httpd/conf/loncapa.conf");
3010:
3011: while (my $configline=<$config>) {
3012: if ($configline =~ /^[^\#]*PerlSetVar/) {
3013: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
3014: chomp($varvalue);
3015: $perlvar{$varname}=$varvalue;
3016: }
3017: }
3018: }
3019: {
3020: my $config=Apache::File->new("/etc/httpd/conf/loncapa_apache.conf");
3021:
3022: while (my $configline=<$config>) {
3023: if ($configline =~ /^[^\#]*PerlSetVar/) {
3024: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
3025: chomp($varvalue);
3026: $perlvar{$varname}=$varvalue;
3027: }
3028: }
3029: }
3030:
3031: # ------------------------------------------------------------- Read hosts file
3032: {
3033: my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
3034:
3035: while (my $configline=<$config>) {
3036: chomp($configline);
3037: my ($id,$domain,$role,$name,$ip,$domdescr)=split(/:/,$configline);
3038: if ($id && $domain && $role && $name && $ip) {
3039: $hostname{$id}=$name;
3040: $hostdom{$id}=$domain;
3041: $hostip{$id}=$ip;
3042: if ($domdescr) { $domaindescription{$domain}=$domdescr; }
3043: if ($role eq 'library') { $libserv{$id}=$name; }
3044: } else {
3045: if ($configline) {
3046: &logthis("Skipping hosts.tab line -$configline-");
3047: }
3048: }
3049: }
3050: }
3051:
3052: # ------------------------------------------------------ Read spare server file
3053: {
3054: my $config=Apache::File->new("$perlvar{'lonTabDir'}/spare.tab");
3055:
3056: while (my $configline=<$config>) {
3057: chomp($configline);
3058: if (($configline) && ($configline ne $perlvar{'lonHostID'})) {
3059: $spareid{$configline}=1;
3060: }
3061: }
3062: }
3063: # ------------------------------------------------------------ Read permissions
3064: {
3065: my $config=Apache::File->new("$perlvar{'lonTabDir'}/roles.tab");
3066:
3067: while (my $configline=<$config>) {
3068: chomp($configline);
3069: if ($configline) {
3070: my ($role,$perm)=split(/ /,$configline);
3071: if ($perm ne '') { $pr{$role}=$perm; }
3072: }
3073: }
3074: }
3075:
3076: # -------------------------------------------- Read plain texts for permissions
3077: {
3078: my $config=Apache::File->new("$perlvar{'lonTabDir'}/rolesplain.tab");
3079:
3080: while (my $configline=<$config>) {
3081: chomp($configline);
3082: if ($configline) {
3083: my ($short,$plain)=split(/:/,$configline);
3084: if ($plain ne '') { $prp{$short}=$plain; }
3085: }
3086: }
3087: }
3088:
3089: # ---------------------------------------------------------- Read package table
3090: {
3091: my $config=Apache::File->new("$perlvar{'lonTabDir'}/packages.tab");
3092:
3093: while (my $configline=<$config>) {
3094: chomp($configline);
3095: my ($short,$plain)=split(/:/,$configline);
3096: my ($pack,$name)=split(/\&/,$short);
3097: if ($plain ne '') {
3098: $packagetab{$pack.'&'.$name.'&name'}=$name;
3099: $packagetab{$short}=$plain;
3100: }
3101: }
3102: }
3103:
3104: %metacache=();
3105:
3106: $processmarker=$$.'_'.time.'_'.$perlvar{'lonHostID'};
3107: $dumpcount=0;
3108:
3109: &logtouch();
3110: &logthis('<font color=yellow>INFO: Read configuration</font>');
3111: $readit=1;
3112: }
3113: }
3114:
3115: 1;
3116: __END__
3117:
3118: =pod
3119:
3120: =head1 NAME
3121:
3122: Apache::lonnet - Subroutines to ask questions about things in the network.
3123:
3124: =head1 SYNOPSIS
3125:
3126: Invoked by other LON-CAPA modules, when they need to talk to or about objects in the network.
3127:
3128: &Apache::lonnet::SUBROUTINENAME(ARGUMENTS);
3129:
3130: Common parameters:
3131:
3132: =over 4
3133:
3134: =item *
3135:
3136: $uname : an internal username (if $cname expecting a course Id specifically)
3137:
3138: =item *
3139:
3140: $udom : a domain (if $cdom expecting a course's domain specifically)
3141:
3142: =item *
3143:
3144: $symb : a resource instance identifier
3145:
3146: =item *
3147:
3148: $namespace : the name of a .db file that contains the data needed or
3149: being set.
3150:
3151: =back
3152:
3153: =head1 INTRODUCTION
3154:
3155: This module provides subroutines which interact with the
3156: lonc/lond (TCP) network layer of LON-CAPA. And Can be used to ask about
3157: - classes
3158: - users
3159: - resources
3160:
3161: For many of these objects you can also use this to store data about
3162: them or modify them in various ways.
3163:
3164: This is part of the LearningOnline Network with CAPA project
3165: described at http://www.lon-capa.org.
3166:
3167: =head1 RETURN MESSAGES
3168:
3169: =over 4
3170:
3171: =item *
3172:
3173: con_lost : unable to contact remote host
3174:
3175: =item *
3176:
3177: con_delayed : unable to contact remote host, message will be delivered
3178: when the connection is brought back up
3179:
3180: =item *
3181:
3182: con_failed : unable to contact remote host and unable to save message
3183: for later delivery
3184:
3185: =item *
3186:
3187: error: : an error a occured, a description of the error follows the :
3188:
3189: =item *
3190:
3191: no_such_host : unable to fund a host associated with the user/domain
3192: that was requested
3193:
3194: =back
3195:
3196: =head1 PUBLIC SUBROUTINES
3197:
3198: =head2 Session Environment Functions
3199:
3200: =over 4
3201:
3202: =item *
3203:
3204: appenv(%hash) : the value of %hash is written to the user envirnoment
3205: file, and will be restored for each access this user makes during this
3206: session, also modifies the %ENV for the current process
3207:
3208: =item *
3209:
3210: delenv($regexp) : removes all items from the session environment file that matches the regular expression in $regexp. The values are also delted from the current processes %ENV.
3211:
3212: =back
3213:
3214: =head2 User Information
3215:
3216: =over 4
3217:
3218: =item *
3219:
3220: queryauthenticate($uname,$udom) : try to determine user's current
3221: authentication scheme
3222:
3223: =item *
3224:
3225: authenticate($uname,$upass,$udom) : try to authenticate user from domain's lib
3226: servers (first use the current one), $upass should be the users password
3227:
3228: =item *
3229:
3230: homeserver($uname,$udom) : find the server which has the user's
3231: directory and files (there must be only one), this caches the answer,
3232: and also caches if there is a borken connection.
3233:
3234: =item *
3235:
3236: idget($udom,@ids) : find the usernames behind a list of IDs (IDs are a
3237: unique resource in a domain, there must be only 1 ID per username, and
3238: only 1 username per ID in a specific domain) (returns hash:
3239: id=>name,id=>name)
3240:
3241: =item *
3242:
3243: idrget($udom,@unames) : find the IDs behind a list of usernames (returns hash:
3244: name=>id,name=>id)
3245:
3246: =item *
3247:
3248: idput($udom,%ids) : store away a list of names and associated IDs
3249:
3250: =item *
3251:
3252: rolesinit($udom,$username,$authhost) : get user privileges
3253:
3254: =item *
3255:
3256: usection($udom,$uname,$cname) : finds the section of student in the
3257: course $cname, return section name/number or '' for "not in course"
3258: and '-1' for "no section"
3259:
3260: =item *
3261:
3262: userenvironment($udom,$uname,@what) : gets the values of the keys
3263: passed in @what from the requested user's environment, returns a hash
3264:
3265: =back
3266:
3267: =head2 User Roles
3268:
3269: =over 4
3270:
3271: =item *
3272:
3273: allowed($priv,$uri) : check for a user privilege; returns codes for allowed
3274: actions
3275: F: full access
3276: U,I,K: authentication modes (cxx only)
3277: '': forbidden
3278: 1: user needs to choose course
3279: 2: browse allowed
3280:
3281: =item *
3282:
3283: definerole($rolename,$sysrole,$domrole,$courole) : define role; define a custom
3284: role rolename set privileges in format of lonTabs/roles.tab for system, domain,
3285: and course level
3286:
3287: =item *
3288:
3289: plaintext($short) : return value in %prp hash (rolesplain.tab); plain text
3290: explanation of a user role term
3291:
3292: =back
3293:
3294: =head2 User Modification
3295:
3296: =over 4
3297:
3298: =item *
3299:
3300: assignrole($udom,$uname,$url,$role,$end,$start) : assign role; give a role to a
3301: user for the level given by URL. Optional start and end dates (leave empty
3302: string or zero for "no date")
3303:
3304: =item *
3305:
3306: changepass($uname,$udom,$currentpass,$newpass,$server) : attempts to
3307: change a users, password, possible return values are: ok,
3308: pwchange_failure, non_authorized, auth_mode_error, unknown_user,
3309: refused
3310:
3311: =item *
3312:
3313: modifyuserauth($udom,$uname,$umode,$upass) : modify user authentication
3314:
3315: =item *
3316:
3317: modifyuser($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene) :
3318: modify user
3319:
3320: =item *
3321:
3322: modifystudent($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,$end,$start) : modify student
3323:
3324: =item *
3325:
3326: assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start) : assign
3327: custom role; give a custom role to a user for the level given by URL. Specify
3328: name and domain of role author, and role name
3329:
3330: =item *
3331:
3332: revokerole($udom,$uname,$url,$role) : revoke a role for url
3333:
3334: =item *
3335:
3336: revokecustomrole($udom,$uname,$url,$role) : revoke a custom role
3337:
3338: =back
3339:
3340: =head2 Course Infomation
3341:
3342: =over 4
3343:
3344: =item *
3345:
3346: coursedescription($courseid) : course description
3347:
3348: =item *
3349:
3350: courseresdata($coursenum,$coursedomain,@which) : request for current
3351: parameter setting for a specific course, @what should be a list of
3352: parameters to ask about. This routine caches answers for 5 minutes.
3353:
3354: =back
3355:
3356: =head2 Course Modification
3357:
3358: =over 4
3359:
3360: =item *
3361:
3362: writecoursepref($courseid,%prefs) : write preferences (environment
3363: database) for a course
3364:
3365: =item *
3366:
3367: createcourse($udom,$description,$url) : make/modify course
3368:
3369: =back
3370:
3371: =head2 Resource Subroutines
3372:
3373: =over 4
3374:
3375: =item *
3376:
3377: subscribe($fname) : subscribe to a resource, returns URL if possible (probably should use repcopy instead)
3378:
3379: =item *
3380:
3381: repcopy($filename) : subscribes to the requested file, and attempts to
3382: replicate from the owning library server, Might return
3383: HTTP_SERVICE_UNAVAILABLE, HTTP_NOT_FOUND, FORBIDDEN, OK, or
3384: HTTP_BAD_REQUEST, also attempts to grab the metadata for the
3385: resource. Expects the local filesystem pathname
3386: (/home/httpd/html/res/....)
3387:
3388: =back
3389:
3390: =head2 Resource Information
3391:
3392: =over 4
3393:
3394: =item *
3395:
3396: EXT($varname,$symb,$udom,$uname) : evaluates and returns the value of
3397: a vairety of different possible values, $varname should be a request
3398: string, and the other parameters can be used to specify who and what
3399: one is asking about.
3400:
3401: Possible values for $varname are environment.lastname (or other item
3402: from the envirnment hash), user.name (or someother aspect about the
3403: user), resource.0.maxtries (or some other part and parameter of a
3404: resource)
3405:
3406: =item *
3407:
3408: directcondval($number) : get current value of a condition; reads from a state
3409: string
3410:
3411: =item *
3412:
3413: condval($condidx) : value of condition index based on state
3414:
3415: =item *
3416:
3417: metadata($uri,$what,$liburi,$prefix,$depthcount) : request a
3418: resource's metadata, $what should be either a specific key, or either
3419: 'keys' (to get a list of possible keys) or 'packages' to get a list of
3420: packages that this resource currently uses, the last 3 arguments are only used internally for recursive metadata.
3421:
3422: this function automatically caches all requests
3423:
3424: =item *
3425:
3426: metadata_query($query,$custom,$customshow) : make a metadata query against the
3427: network of library servers; returns file handle of where SQL and regex results
3428: will be stored for query
3429:
3430: =item *
3431:
3432: symbread($filename) : return symbolic list entry (filename argument optional);
3433: returns the data handle
3434:
3435: =item *
3436:
3437: symbverify($symb,$thisfn) : verifies that $symb actually exists and is
3438: a possible symb for the URL in $thisfn, returns a 1 on success, 0 on
3439: failure, user must be in a course, as it assumes the existance of the
3440: course initi hash, and uses $ENV('request.course.id'}
3441:
3442:
3443: =item *
3444:
3445: symbclean($symb) : removes versions numbers from a symb, returns the
3446: cleaned symb
3447:
3448: =item *
3449:
3450: is_on_map($uri) : checks if the $uri is somewhere on the current
3451: course map, user must be in a course for it to work.
3452:
3453: =item *
3454:
3455: numval($salt) : return random seed value (addend for rndseed)
3456:
3457: =item *
3458:
3459: rndseed($symb,$courseid,$udom,$uname) : create a random sum; returns
3460: a random seed, all arguments are optional, if they aren't sent it uses the
3461: environment to derive them. Note: if symb isn't sent and it can't get one
3462: from &symbread it will use the current time as its return value
3463:
3464: =item *
3465:
3466: ireceipt($funame,$fudom,$fucourseid,$fusymb) : return unique,
3467: unfakeable, receipt
3468:
3469: =item *
3470:
3471: receipt() : API to ireceipt working off of ENV values; given out to users
3472:
3473: =item *
3474:
3475: countacc($url) : count the number of accesses to a given URL
3476:
3477: =item *
3478:
3479: checkout($symb,$tuname,$tudom,$tcrsid) : creates a record of a user having looked at an item, most likely printed out or otherwise using a resource
3480:
3481: =item *
3482:
3483: checkin($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 $tcrsid)
3484:
3485: =item *
3486:
3487: expirespread($uname,$udom,$stype,$usymb) : set expire date for spreadsheet
3488:
3489: =item *
3490:
3491: devalidate($symb) : devalidate temporary spreadsheet calculations,
3492: forcing spreadsheet to reevaluate the resource scores next time.
3493:
3494: =back
3495:
3496: =head2 Storing/Retreiving Data
3497:
3498: =over 4
3499:
3500: =item *
3501:
3502: store($storehash,$symb,$namespace,$udom,$uname) : stores hash permanently
3503: for this url; hashref needs to be given and should be a \%hashname; the
3504: remaining args aren't required and if they aren't passed or are '' they will
3505: be derived from the ENV
3506:
3507: =item *
3508:
3509: cstore($storehash,$symb,$namespace,$udom,$uname) : same as store but
3510: uses critical subroutine
3511:
3512: =item *
3513:
3514: restore($symb,$namespace,$udom,$uname) : returns hash for this symb;
3515: all args are optional
3516:
3517: =item *
3518:
3519: tmpstore($storehash,$symb,$namespace,$udom,$uname) : storage that
3520: works very similar to store/cstore, but all data is stored in a
3521: temporary location and can be reset using tmpreset, $storehash should
3522: be a hash reference, returns nothing on success
3523:
3524: =item *
3525:
3526: tmprestore($symb,$namespace,$udom,$uname) : storage that works very
3527: similar to restore, but all data is stored in a temporary location and
3528: can be reset using tmpreset. Returns a hash of values on success,
3529: error string otherwise.
3530:
3531: =item *
3532:
3533: tmpreset($symb,$namespace,$udom,$uname) : temporary storage reset,
3534: deltes all keys for $symb form the temporary storage hash.
3535:
3536: =item *
3537:
3538: get($namespace,$storearr,$udom,$uname) : returns hash with keys from array
3539: reference filled in from namesp ($udom and $uname are optional)
3540:
3541: =item *
3542:
3543: del($namespace,$storearr,$udom,$uname) : deletes keys out of array from
3544: namesp ($udom and $uname are optional)
3545:
3546: =item *
3547:
3548: dump($namespace,$udom,$uname,$regexp) :
3549: dumps the complete (or key matching regexp) namespace into a hash
3550: ($udom, $uname and $regexp are optional)
3551:
3552: =item *
3553:
3554: put($namespace,$storehash,$udom,$uname) : stores hash in namesp
3555: ($udom and $uname are optional)
3556:
3557: =item *
3558:
3559: cput($namespace,$storehash,$udom,$uname) : critical put
3560: ($udom and $uname are optional)
3561:
3562: =item *
3563:
3564: eget($namespace,$storearr,$udom,$uname) : returns hash with keys from array
3565: reference filled in from namesp (encrypts the return communication)
3566: ($udom and $uname are optional)
3567:
3568: =item *
3569:
3570: log($udom,$name,$home,$message) : write to permanent log for user; use
3571: critical subroutine
3572:
3573: =back
3574:
3575: =head2 Network Status Functions
3576:
3577: =over 4
3578:
3579: =item *
3580:
3581: dirlist($uri) : return directory list based on URI
3582:
3583: =item *
3584:
3585: spareserver() : find server with least workload from spare.tab
3586:
3587: =back
3588:
3589: =head2 Apache Request
3590:
3591: =over 4
3592:
3593: =item *
3594:
3595: ssi($url,%hash) : server side include, does a complete request cycle on url to
3596: localhost, posts hash
3597:
3598: =back
3599:
3600: =head2 Data to String to Data
3601:
3602: =over 4
3603:
3604: =item *
3605:
3606: hash2str(%hash) : convert a hash into a string complete with escaping and '='
3607: and '&' separators, supports elements that are arrayrefs and hashrefs
3608:
3609: =item *
3610:
3611: hashref2str($hashref) : convert a hashref into a string complete with
3612: escaping and '=' and '&' separators, supports elements that are
3613: arrayrefs and hashrefs
3614:
3615: =item *
3616:
3617: arrayref2str($arrayref) : convert an arrayref into a string complete
3618: with escaping and '&' separators, supports elements that are arrayrefs
3619: and hashrefs
3620:
3621: =item *
3622:
3623: str2hash($string) : convert string to hash using unescaping and
3624: splitting on '=' and '&', supports elements that are arrayrefs and
3625: hashrefs
3626:
3627: =item *
3628:
3629: str2array($string) : convert string to hash using unescaping and
3630: splitting on '&', supports elements that are arrayrefs and hashrefs
3631:
3632: =back
3633:
3634: =head2 Logging Routines
3635:
3636: =over 4
3637:
3638: These routines allow one to make log messages in the lonnet.log and
3639: lonnet.perm logfiles.
3640:
3641: =item *
3642:
3643: logtouch() : make sure the logfile, lonnet.log, exists
3644:
3645: =item *
3646:
3647: logthis() : append message to the normal lonnet.log file, it gets
3648: preiodically rolled over and deleted.
3649:
3650: =item *
3651:
3652: logperm() : append a permanent message to lonnet.perm.log, this log
3653: file never gets deleted by any automated portion of the system, only
3654: messages of critical importance should go in here.
3655:
3656: =back
3657:
3658: =head2 General File Helper Routines
3659:
3660: =over 4
3661:
3662: =item *
3663:
3664: getfile($file) : returns the entire contents of a file or -1; it
3665: properly subscribes to and replicates the file if neccessary.
3666:
3667: =item *
3668:
3669: filelocation($dir,$file) : returns file system location of a file
3670: based on URI; meant to be "fairly clean" absolute reference, $dir is a
3671: directory that relative $file lookups are to looked in ($dir of /a/dir
3672: and a file of ../bob will become /a/bob)
3673:
3674: =item *
3675:
3676: hreflocation($dir,$file) : returns file system location or a URL; same as
3677: filelocation except for hrefs
3678:
3679: =item *
3680:
3681: declutter() : declutters URLs (remove docroot, beginning slashes, 'res' etc)
3682:
3683: =back
3684:
3685: =head2 HTTP Helper Routines
3686:
3687: =over 4
3688:
3689: =item *
3690:
3691: escape() : unpack non-word characters into CGI-compatible hex codes
3692:
3693: =item *
3694:
3695: unescape() : pack CGI-compatible hex codes into actual non-word ASCII character
3696:
3697: =back
3698:
3699: =head1 PRIVATE SUBROUTINES
3700:
3701: =head2 Underlying communication routines (Shouldn't call)
3702:
3703: =over 4
3704:
3705: =item *
3706:
3707: subreply() : tries to pass a message to lonc, returns con_lost if incapable
3708:
3709: =item *
3710:
3711: reply() : uses subreply to send a message to remote machine, logs all failures
3712:
3713: =item *
3714:
3715: critical() : passes a critical message to another server; if cannot
3716: get through then place message in connection buffer directory and
3717: returns con_delayed, if incapable of saving message, returns
3718: con_failed
3719:
3720: =item *
3721:
3722: reconlonc() : tries to reconnect lonc client processes.
3723:
3724: =back
3725:
3726: =head2 Resource Access Logging
3727:
3728: =over 4
3729:
3730: =item *
3731:
3732: flushcourselogs() : flush (save) buffer logs and access logs
3733:
3734: =item *
3735:
3736: courselog($what) : save message for course in hash
3737:
3738: =item *
3739:
3740: courseacclog($what) : save message for course using &courselog(). Perform
3741: special processing for specific resource types (problems, exams, quizzes, etc).
3742:
3743: =item *
3744:
3745: goodbye() : flush course logs and log shutting down; it is called in srm.conf
3746: as a PerlChildExitHandler
3747:
3748: =back
3749:
3750: =head2 Other
3751:
3752: =over 4
3753:
3754: =item *
3755:
3756: symblist($mapname,%newhash) : update symbolic storage links
3757:
3758: =back
3759:
3760: =cut
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