1: # The LearningOnline Network
2: #
3: # $Id: Lond.pm,v 1.5 2013/07/24 18:21:52 bisitz Exp $
4: #
5: # Copyright Michigan State University Board of Trustees
6: #
7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
8: #
9: # LON-CAPA is free software; you can redistribute it and/or modify
10: # it under the terms of the GNU General Public License as published by
11: # the Free Software Foundation; either version 2 of the License, or
12: # (at your option) any later version.
13: #
14: # LON-CAPA is distributed in the hope that it will be useful,
15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: # GNU General Public License for more details.
18: #
19: # You should have received a copy of the GNU General Public License
20: # along with LON-CAPA; if not, write to the Free Software
21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22: #
23: # /home/httpd/html/adm/gpl.txt
24: #
25: # http://www.lon-capa.org/
26: #
27: ###
28:
29: #NOTE perldoc at the end of file
30: #TODO move remaining lond functions into this
31:
32: package LONCAPA::Lond;
33:
34: use strict;
35: use lib '/home/httpd/lib/perl/';
36:
37: use LONCAPA;
38: use Apache::lonnet;
39: use GDBM_File;
40:
41:
42: sub dump_with_regexp {
43: my ( $tail, $clientversion ) = @_;
44: my ( $udom, $uname, $namespace, $regexp, $range ) =
45: split /:/, $tail;
46:
47: $regexp = $regexp ? unescape($regexp) : '.';
48:
49: my ($start,$end);
50:
51: if (defined($range)) {
52: if ($range =~ /^(\d+)\-(\d+)$/) {
53: ($start,$end) = ($1,$2);
54: } elsif ($range =~/^(\d+)$/) {
55: ($start,$end) = (0,$1);
56: } else {
57: undef($range);
58: }
59: }
60:
61: my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER()) or
62: return "error: ".($!+0)." tie(GDBM) Failed while attempting dump";
63:
64: my $qresult = '';
65: my $count = 0;
66: #
67: # When dump is for roles.db, determine if LON-CAPA version checking is needed.
68: # Sessions on 2.10 and later do not require version checking, as that occurs
69: # on the server hosting the user session, when constructing the roles/courses
70: # screen).
71: #
72: my $skipcheck;
73: my @ids = &Apache::lonnet::current_machine_ids();
74: my (%homecourses, $major, $minor, $now);
75: #
76: # If dump is for roles.db from a pre-2.10 server, determine the LON-CAPA
77: # version on the server which requested the data.
78: #
79: if ($namespace eq 'roles') {
80: if ($clientversion =~ /^\'?(\d+)\.(\d+)\.[\w.\-]+\'?/) {
81: $major = $1;
82: $minor = $2;
83:
84: }
85: if (($major > 2) || (($major == 2) && ($minor > 9))) {
86: $skipcheck = 1;
87: }
88: $now = time;
89: }
90: while (my ($key,$value) = each(%$hashref)) {
91: if ($namespace eq 'roles' && (!$skipcheck)) {
92: if ($key =~ m{^/($LONCAPA::match_domain)/($LONCAPA::match_courseid)(/?[^_]*)_(cc|co|in|ta|ep|ad|st|cr)$}) {
93: my $cdom = $1;
94: my $cnum = $2;
95: my ($role,$roleend,$rolestart) = split(/\_/,$value);
96: if (!$roleend || $roleend > $now) {
97: #
98: # For active course roles, check that requesting server is running a LON-CAPA
99: # version which meets any version requirements for the course. Do not include
100: # the role amongst the results returned if the requesting server's version is
101: # too old.
102: #
103: # This determination is handled differently depending on whether the course's
104: # homeserver is the current server, or whether it is a different server.
105: # In both cases, the course's version requirement needs to be retrieved.
106: #
107: next unless (&releasereqd_check($cnum,$cdom,$key,$value,$major,
108: $minor,\%homecourses,\@ids));
109: }
110: }
111: }
112: if ($regexp eq '.') {
113: $count++;
114: if (defined($range) && $count >= $end) { last; }
115: if (defined($range) && $count < $start) { next; }
116: $qresult.=$key.'='.$value.'&';
117: } else {
118: my $unescapeKey = &unescape($key);
119: if (eval('$unescapeKey=~/$regexp/')) {
120: $count++;
121: if (defined($range) && $count >= $end) { last; }
122: if (defined($range) && $count < $start) { next; }
123: $qresult.="$key=$value&";
124: }
125: }
126: }
127:
128: &untie_user_hash($hashref) or
129: return "error: ".($!+0)." untie(GDBM) Failed while attempting dump";
130: #
131: # If dump is for roles.db from a pre-2.10 server, check if the LON-CAPA
132: # version requirements for courses for which the current server is the home
133: # server permit course roles to be usable on the client server hosting the
134: # user's session. If so, include those role results in the data returned to
135: # the client server.
136: #
137: if (($namespace eq 'roles') && (!$skipcheck)) {
138: if (keys(%homecourses) > 0) {
139: $qresult .= &check_homecourses(\%homecourses,$regexp,$count,
140: $range,$start,$end,$major,$minor);
141: }
142: }
143: chop($qresult);
144: return $qresult;
145: }
146:
147:
148: sub releasereqd_check {
149: my ($cnum,$cdom,$key,$value,$major,$minor,$homecourses,$ids) = @_;
150: my $home = &Apache::lonnet::homeserver($cnum,$cdom);
151: return if ($home eq 'no_host');
152: my ($reqdmajor,$reqdminor,$displayrole);
153: if ($cnum =~ /$LONCAPA::match_community/) {
154: if ($major eq '' && $minor eq '') {
155: return unless ((ref($ids) eq 'ARRAY') &&
156: (grep(/^\Q$home\E$/,@{$ids})));
157: } else {
158: $reqdmajor = 2;
159: $reqdminor = 9;
160: return unless (&useable_role($reqdmajor,$reqdminor,$major,$minor));
161: }
162: }
163: my $hashid = $cdom.':'.$cnum;
164: my ($courseinfo,$cached) =
165: &Apache::lonnet::is_cached_new('courseinfo',$hashid);
166: if (defined($cached)) {
167: if (ref($courseinfo) eq 'HASH') {
168: if (exists($courseinfo->{'releaserequired'})) {
169: my ($reqdmajor,$reqdminor) = split(/\./,$courseinfo->{'releaserequired'});
170: return unless (&useable_role($reqdmajor,$reqdminor,$major,$minor));
171: }
172: }
173: } else {
174: if (ref($ids) eq 'ARRAY') {
175: if (grep(/^\Q$home\E$/,@{$ids})) {
176: if (ref($homecourses) eq 'HASH') {
177: if (ref($homecourses->{$cdom}) eq 'HASH') {
178: if (ref($homecourses->{$cdom}{$cnum}) eq 'HASH') {
179: if (ref($homecourses->{$cdom}{$cnum}) eq 'ARRAY') {
180: push(@{$homecourses->{$cdom}{$cnum}},{$key=>$value});
181: } else {
182: $homecourses->{$cdom}{$cnum} = [{$key=>$value}];
183: }
184: } else {
185: $homecourses->{$cdom}{$cnum} = [{$key=>$value}];
186: }
187: } else {
188: $homecourses->{$cdom}{$cnum} = [{$key=>$value}];
189: }
190: }
191: return;
192: }
193: }
194: my $courseinfo = &get_courseinfo_hash($cnum,$cdom,$home);
195: if (ref($courseinfo) eq 'HASH') {
196: if (exists($courseinfo->{'releaserequired'})) {
197: my ($reqdmajor,$reqdminor) = split(/\./,$courseinfo->{'releaserequired'});
198: return unless (&useable_role($reqdmajor,$reqdminor,$major,$minor));
199: }
200: } else {
201: return;
202: }
203: }
204: return 1;
205: }
206:
207:
208: sub check_homecourses {
209: my ($homecourses,$regexp,$count,$range,$start,$end,$major,$minor) = @_;
210: my ($result,%addtocache);
211: my $yesterday = time - 24*3600;
212: if (ref($homecourses) eq 'HASH') {
213: my (%okcourses,%courseinfo,%recent);
214: foreach my $domain (keys(%{$homecourses})) {
215: my $hashref =
216: &tie_domain_hash($domain, "nohist_courseids", &GDBM_WRCREAT());
217: if (ref($hashref) eq 'HASH') {
218: while (my ($key,$value) = each(%$hashref)) {
219: my $unesc_key = &unescape($key);
220: if ($unesc_key =~ /^lasttime:(\w+)$/) {
221: my $cid = $1;
222: $cid =~ s/_/:/;
223: if ($value > $yesterday ) {
224: $recent{$cid} = 1;
225: }
226: next;
227: }
228: my $items = &Apache::lonnet::thaw_unescape($value);
229: if (ref($items) eq 'HASH') {
230: my ($cdom,$cnum) = split(/_/,$unesc_key);
231: my $hashid = $cdom.':'.$cnum;
232: $courseinfo{$hashid} = $items;
233: if (ref($homecourses->{$cdom}{$cnum}) eq 'ARRAY') {
234: my ($reqdmajor,$reqdminor) = split(/\./,$items->{'releaserequired'});
235: if (&useable_role($reqdmajor,$reqdminor,$major,$minor)) {
236: $okcourses{$hashid} = 1;
237: }
238: }
239: }
240: }
241: unless (&untie_domain_hash($hashref)) {
242: &logthis("Failed to untie tied hash for nohist_courseids.db for $domain");
243: }
244: } else {
245: &logthis("Failed to tie hash for nohist_courseids.db for $domain");
246: }
247: }
248: foreach my $hashid (keys(%recent)) {
249: my ($result,$cached)=&Apache::lonnet::is_cached_new('courseinfo',$hashid);
250: unless ($cached) {
251: &Apache::lonnet::do_cache_new('courseinfo',$hashid,$courseinfo{$hashid},600);
252: }
253: }
254: foreach my $cdom (keys(%{$homecourses})) {
255: if (ref($homecourses->{$cdom}) eq 'HASH') {
256: foreach my $cnum (keys(%{$homecourses->{$cdom}})) {
257: my $hashid = $cdom.':'.$cnum;
258: next if ($recent{$hashid});
259: &Apache::lonnet::do_cache_new('courseinfo',$hashid,$courseinfo{$hashid},600);
260: }
261: }
262: }
263: foreach my $hashid (keys(%okcourses)) {
264: my ($cdom,$cnum) = split(/:/,$hashid);
265: if ((ref($homecourses->{$cdom}) eq 'HASH') &&
266: (ref($homecourses->{$cdom}{$cnum}) eq 'ARRAY')) {
267: foreach my $role (@{$homecourses->{$cdom}{$cnum}}) {
268: if (ref($role) eq 'HASH') {
269: while (my ($key,$value) = each(%{$role})) {
270: if ($regexp eq '.') {
271: $count++;
272: if (defined($range) && $count >= $end) { last; }
273: if (defined($range) && $count < $start) { next; }
274: $result.=$key.'='.$value.'&';
275: } else {
276: my $unescapeKey = &unescape($key);
277: if (eval('$unescapeKey=~/$regexp/')) {
278: $count++;
279: if (defined($range) && $count >= $end) { last; }
280: if (defined($range) && $count < $start) { next; }
281: $result.="$key=$value&";
282: }
283: }
284: }
285: }
286: }
287: }
288: }
289: }
290: return $result;
291: }
292:
293:
294: sub useable_role {
295: my ($reqdmajor,$reqdminor,$major,$minor) = @_;
296: if ($reqdmajor ne '' && $reqdminor ne '') {
297: return if (($major eq '' && $minor eq '') ||
298: ($major < $reqdmajor) ||
299: (($major == $reqdmajor) && ($minor < $reqdminor)));
300: }
301: return 1;
302: }
303:
304:
305: sub get_courseinfo_hash {
306: my ($cnum,$cdom,$home) = @_;
307: my %info;
308: eval {
309: local($SIG{ALRM}) = sub { die "timeout\n"; };
310: local($SIG{__DIE__})='DEFAULT';
311: alarm(3);
312: %info = &Apache::lonnet::courseiddump($cdom,'.',1,'.','.',$cnum,1,[$home],'.');
313: alarm(0);
314: };
315: if ($@) {
316: if ($@ eq "timeout\n") {
317: &logthis("<font color='blue'>WARNING courseiddump for $cnum:$cdom from $home timedout</font>");
318: } else {
319: &logthis("<font color='yellow'>WARNING unexpected error during eval of call for courseiddump from $home</font>");
320: }
321: } else {
322: if (ref($info{$cdom.'_'.$cnum}) eq 'HASH') {
323: my $hashid = $cdom.':'.$cnum;
324: return &Apache::lonnet::do_cache_new('courseinfo',$hashid,$info{$cdom.'_'.$cnum},600);
325: }
326: }
327: return;
328: }
329:
330: sub dump_course_id_handler {
331: my ($tail) = @_;
332:
333: my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
334: $typefilter,$regexp_ok,$rtn_as_hash,$selfenrollonly,$catfilter,$showhidden,
335: $caller,$cloner,$cc_clone_list,$cloneonly,$createdbefore,$createdafter,
336: $creationcontext,$domcloner) = split(/:/,$tail);
337: my $now = time;
338: my ($cloneruname,$clonerudom,%cc_clone);
339: if (defined($description)) {
340: $description=&unescape($description);
341: } else {
342: $description='.';
343: }
344: if (defined($instcodefilter)) {
345: $instcodefilter=&unescape($instcodefilter);
346: } else {
347: $instcodefilter='.';
348: }
349: my ($ownerunamefilter,$ownerdomfilter);
350: if (defined($ownerfilter)) {
351: $ownerfilter=&unescape($ownerfilter);
352: if ($ownerfilter ne '.' && defined($ownerfilter)) {
353: if ($ownerfilter =~ /^([^:]*):([^:]*)$/) {
354: $ownerunamefilter = $1;
355: $ownerdomfilter = $2;
356: } else {
357: $ownerunamefilter = $ownerfilter;
358: $ownerdomfilter = '';
359: }
360: }
361: } else {
362: $ownerfilter='.';
363: }
364:
365: if (defined($coursefilter)) {
366: $coursefilter=&unescape($coursefilter);
367: } else {
368: $coursefilter='.';
369: }
370: if (defined($typefilter)) {
371: $typefilter=&unescape($typefilter);
372: } else {
373: $typefilter='.';
374: }
375: if (defined($regexp_ok)) {
376: $regexp_ok=&unescape($regexp_ok);
377: }
378: if (defined($catfilter)) {
379: $catfilter=&unescape($catfilter);
380: }
381: if (defined($cloner)) {
382: $cloner = &unescape($cloner);
383: ($cloneruname,$clonerudom) = ($cloner =~ /^($LONCAPA::match_username):($LONCAPA::match_domain)$/);
384: }
385: if (defined($cc_clone_list)) {
386: $cc_clone_list = &unescape($cc_clone_list);
387: my @cc_cloners = split('&',$cc_clone_list);
388: foreach my $cid (@cc_cloners) {
389: my ($clonedom,$clonenum) = split(':',$cid);
390: next if ($clonedom ne $udom);
391: $cc_clone{$clonedom.'_'.$clonenum} = 1;
392: }
393: }
394: if ($createdbefore ne '') {
395: $createdbefore = &unescape($createdbefore);
396: } else {
397: $createdbefore = 0;
398: }
399: if ($createdafter ne '') {
400: $createdafter = &unescape($createdafter);
401: } else {
402: $createdafter = 0;
403: }
404: if ($creationcontext ne '') {
405: $creationcontext = &unescape($creationcontext);
406: } else {
407: $creationcontext = '.';
408: }
409: my $unpack = 1;
410: if ($description eq '.' && $instcodefilter eq '.' && $ownerfilter eq '.' &&
411: $typefilter eq '.') {
412: $unpack = 0;
413: }
414: if (!defined($since)) { $since=0; }
415: my $qresult='';
416:
417: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT())
418: or return "error: ".($!+0)." tie(GDBM) Failed while attempting courseiddump";
419:
420: while (my ($key,$value) = each(%$hashref)) {
421: my ($unesc_key,$lasttime_key,$lasttime,$is_hash,%val,
422: %unesc_val,$selfenroll_end,$selfenroll_types,$created,
423: $context);
424: $unesc_key = &unescape($key);
425: if ($unesc_key =~ /^lasttime:/) {
426: next;
427: } else {
428: $lasttime_key = &escape('lasttime:'.$unesc_key);
429: }
430: if ($hashref->{$lasttime_key} ne '') {
431: $lasttime = $hashref->{$lasttime_key};
432: next if ($lasttime<$since);
433: }
434: my ($canclone,$valchange);
435: my $items = &Apache::lonnet::thaw_unescape($value);
436: if (ref($items) eq 'HASH') {
437: if ($hashref->{$lasttime_key} eq '') {
438: next if ($since > 1);
439: }
440: $is_hash = 1;
441: if ($domcloner) {
442: $canclone = 1;
443: } elsif (defined($clonerudom)) {
444: if ($items->{'cloners'}) {
445: my @cloneable = split(',',$items->{'cloners'});
446: if (@cloneable) {
447: if (grep(/^\*$/,@cloneable)) {
448: $canclone = 1;
449: } elsif (grep(/^\*:\Q$clonerudom\E$/,@cloneable)) {
450: $canclone = 1;
451: } elsif (grep(/^\Q$cloneruname\E:\Q$clonerudom\E$/,@cloneable)) {
452: $canclone = 1;
453: }
454: }
455: unless ($canclone) {
456: if ($cloneruname ne '' && $clonerudom ne '') {
457: if ($cc_clone{$unesc_key}) {
458: $canclone = 1;
459: $items->{'cloners'} .= ','.$cloneruname.':'.
460: $clonerudom;
461: $valchange = 1;
462: }
463: }
464: }
465: } elsif (defined($cloneruname)) {
466: if ($cc_clone{$unesc_key}) {
467: $canclone = 1;
468: $items->{'cloners'} = $cloneruname.':'.$clonerudom;
469: $valchange = 1;
470: }
471: unless ($canclone) {
472: if ($items->{'owner'} =~ /:/) {
473: if ($items->{'owner'} eq $cloner) {
474: $canclone = 1;
475: }
476: } elsif ($cloner eq $items->{'owner'}.':'.$udom) {
477: $canclone = 1;
478: }
479: if ($canclone) {
480: $items->{'cloners'} = $cloneruname.':'.$clonerudom;
481: $valchange = 1;
482: }
483: }
484: }
485: }
486: if ($unpack || !$rtn_as_hash) {
487: $unesc_val{'descr'} = $items->{'description'};
488: $unesc_val{'inst_code'} = $items->{'inst_code'};
489: $unesc_val{'owner'} = $items->{'owner'};
490: $unesc_val{'type'} = $items->{'type'};
491: $unesc_val{'cloners'} = $items->{'cloners'};
492: $unesc_val{'created'} = $items->{'created'};
493: $unesc_val{'context'} = $items->{'context'};
494: }
495: $selfenroll_types = $items->{'selfenroll_types'};
496: $selfenroll_end = $items->{'selfenroll_end_date'};
497: $created = $items->{'created'};
498: $context = $items->{'context'};
499: if ($selfenrollonly) {
500: next if (!$selfenroll_types);
501: if (($selfenroll_end > 0) && ($selfenroll_end <= $now)) {
502: next;
503: }
504: }
505: if ($creationcontext ne '.') {
506: next if (($context ne '') && ($context ne $creationcontext));
507: }
508: if ($createdbefore > 0) {
509: next if (($created eq '') || ($created > $createdbefore));
510: }
511: if ($createdafter > 0) {
512: next if (($created eq '') || ($created <= $createdafter));
513: }
514: if ($catfilter ne '') {
515: next if ($items->{'categories'} eq '');
516: my @categories = split('&',$items->{'categories'});
517: next if (@categories == 0);
518: my @subcats = split('&',$catfilter);
519: my $matchcat = 0;
520: foreach my $cat (@categories) {
521: if (grep(/^\Q$cat\E$/,@subcats)) {
522: $matchcat = 1;
523: last;
524: }
525: }
526: next if (!$matchcat);
527: }
528: if ($caller eq 'coursecatalog') {
529: if ($items->{'hidefromcat'} eq 'yes') {
530: next if !$showhidden;
531: }
532: }
533: } else {
534: next if ($catfilter ne '');
535: next if ($selfenrollonly);
536: next if ($createdbefore || $createdafter);
537: next if ($creationcontext ne '.');
538: if ((defined($clonerudom)) && (defined($cloneruname))) {
539: if ($cc_clone{$unesc_key}) {
540: $canclone = 1;
541: $val{'cloners'} = &escape($cloneruname.':'.$clonerudom);
542: }
543: }
544: $is_hash = 0;
545: my @courseitems = split(/:/,$value);
546: $lasttime = pop(@courseitems);
547: if ($hashref->{$lasttime_key} eq '') {
548: next if ($lasttime<$since);
549: }
550: ($val{'descr'},$val{'inst_code'},$val{'owner'},$val{'type'}) = @courseitems;
551: }
552: if ($cloneonly) {
553: next unless ($canclone);
554: }
555: my $match = 1;
556: if ($description ne '.') {
557: if (!$is_hash) {
558: $unesc_val{'descr'} = &unescape($val{'descr'});
559: }
560: if (eval{$unesc_val{'descr'} !~ /\Q$description\E/i}) {
561: $match = 0;
562: }
563: }
564: if ($instcodefilter ne '.') {
565: if (!$is_hash) {
566: $unesc_val{'inst_code'} = &unescape($val{'inst_code'});
567: }
568: if ($regexp_ok == 1) {
569: if (eval{$unesc_val{'inst_code'} !~ /$instcodefilter/}) {
570: $match = 0;
571: }
572: } elsif ($regexp_ok == -1) {
573: if (eval{$unesc_val{'inst_code'} =~ /$instcodefilter/}) {
574: $match = 0;
575: }
576: } else {
577: if (eval{$unesc_val{'inst_code'} !~ /\Q$instcodefilter\E/i}) {
578: $match = 0;
579: }
580: }
581: }
582: if ($ownerfilter ne '.') {
583: if (!$is_hash) {
584: $unesc_val{'owner'} = &unescape($val{'owner'});
585: }
586: if (($ownerunamefilter ne '') && ($ownerdomfilter ne '')) {
587: if ($unesc_val{'owner'} =~ /:/) {
588: if (eval{$unesc_val{'owner'} !~
589: /\Q$ownerunamefilter\E:\Q$ownerdomfilter\E$/i}) {
590: $match = 0;
591: }
592: } else {
593: if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E/i}) {
594: $match = 0;
595: }
596: }
597: } elsif ($ownerunamefilter ne '') {
598: if ($unesc_val{'owner'} =~ /:/) {
599: if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E:[^:]+$/i}) {
600: $match = 0;
601: }
602: } else {
603: if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E/i}) {
604: $match = 0;
605: }
606: }
607: } elsif ($ownerdomfilter ne '') {
608: if ($unesc_val{'owner'} =~ /:/) {
609: if (eval{$unesc_val{'owner'} !~ /^[^:]+:\Q$ownerdomfilter\E/}) {
610: $match = 0;
611: }
612: } else {
613: if ($ownerdomfilter ne $udom) {
614: $match = 0;
615: }
616: }
617: }
618: }
619: if ($coursefilter ne '.') {
620: if (eval{$unesc_key !~ /^$udom(_)\Q$coursefilter\E$/}) {
621: $match = 0;
622: }
623: }
624: if ($typefilter ne '.') {
625: if (!$is_hash) {
626: $unesc_val{'type'} = &unescape($val{'type'});
627: }
628: if ($unesc_val{'type'} eq '') {
629: if ($typefilter ne 'Course') {
630: $match = 0;
631: }
632: } else {
633: if (eval{$unesc_val{'type'} !~ /^\Q$typefilter\E$/}) {
634: $match = 0;
635: }
636: }
637: }
638: if ($match == 1) {
639: if ($rtn_as_hash) {
640: if ($is_hash) {
641: if ($valchange) {
642: my $newvalue = &Apache::lonnet::freeze_escape($items);
643: $qresult.=$key.'='.$newvalue.'&';
644: } else {
645: $qresult.=$key.'='.$value.'&';
646: }
647: } else {
648: my %rtnhash = ( 'description' => &unescape($val{'descr'}),
649: 'inst_code' => &unescape($val{'inst_code'}),
650: 'owner' => &unescape($val{'owner'}),
651: 'type' => &unescape($val{'type'}),
652: 'cloners' => &unescape($val{'cloners'}),
653: );
654: my $items = &Apache::lonnet::freeze_escape(\%rtnhash);
655: $qresult.=$key.'='.$items.'&';
656: }
657: } else {
658: if ($is_hash) {
659: $qresult .= $key.'='.&escape($unesc_val{'descr'}).':'.
660: &escape($unesc_val{'inst_code'}).':'.
661: &escape($unesc_val{'owner'}).'&';
662: } else {
663: $qresult .= $key.'='.$val{'descr'}.':'.$val{'inst_code'}.
664: ':'.$val{'owner'}.'&';
665: }
666: }
667: }
668: }
669: &untie_domain_hash($hashref) or
670: return "error: ".($!+0)." untie(GDBM) Failed while attempting courseiddump";
671:
672: chop($qresult);
673: return $qresult;
674: }
675:
676: sub dump_profile_database {
677: my ($tail) = @_;
678:
679: my ($udom,$uname,$namespace) = split(/:/,$tail);
680:
681: my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER()) or
682: return "error: ".($!+0)." tie(GDBM) Failed while attempting currentdump";
683:
684: # Structure of %data:
685: # $data{$symb}->{$parameter}=$value;
686: # $data{$symb}->{'v.'.$parameter}=$version;
687: # since $parameter will be unescaped, we do not
688: # have to worry about silly parameter names...
689:
690: my $qresult='';
691: my %data = (); # A hash of anonymous hashes..
692: while (my ($key,$value) = each(%$hashref)) {
693: my ($v,$symb,$param) = split(/:/,$key);
694: next if ($v eq 'version' || $symb eq 'keys');
695: next if (exists($data{$symb}) &&
696: exists($data{$symb}->{$param}) &&
697: $data{$symb}->{'v.'.$param} > $v);
698: $data{$symb}->{$param}=$value;
699: $data{$symb}->{'v.'.$param}=$v;
700: }
701:
702: &untie_user_hash($hashref) or
703: return "error: ".($!+0)." untie(GDBM) Failed while attempting currentdump";
704:
705: while (my ($symb,$param_hash) = each(%data)) {
706: while(my ($param,$value) = each (%$param_hash)){
707: next if ($param =~ /^v\./); # Ignore versions...
708: #
709: # Just dump the symb=value pairs separated by &
710: #
711: $qresult.=$symb.':'.$param.'='.$value.'&';
712: }
713: }
714:
715: chop($qresult);
716: return $qresult;
717: }
718:
719:
720: 1;
721:
722: __END__
723:
724: =head1 NAME
725:
726: LONCAPA::Lond.pm
727:
728: =head1 SYNOPSIS
729:
730: #TODO
731:
732: =head1 DESCRIPTION
733:
734: #TODO
735:
736: =head1 METHODS
737:
738: =over 4
739:
740: =item dump_with_regexp( $tail, $client )
741:
742: Dump a profile database with an optional regular expression to match against
743: the keys. In this dump, no effort is made to separate symb from version
744: information. Presumably the databases that are dumped by this command are of a
745: different structure. Need to look at this and improve the documentation of
746: both this and the currentdump handler.
747:
748: $tail a colon separated list containing
749:
750: =over
751:
752: =item domain
753:
754: =item user
755:
756: identifying the user.
757:
758: =item namespace
759:
760: identifying the database.
761:
762: =item regexp
763:
764: optional regular expression that is matched against database keywords to do
765: selective dumps.
766:
767: =item range
768:
769: optional range of entries e.g., 10-20 would return the 10th to 19th items, etc.
770:
771: =back
772:
773: $client is the channel open on the client.
774:
775: Returns: 1 (Continue processing).
776:
777: Side effects: response is written to $client.
778:
779: =item dump_course_id_handler
780:
781: #TODO copy from lond
782:
783: =item dump_profile_database
784:
785: #TODO copy from lond
786:
787: =item releasereqd_check( $cnum, $cdom, $key, $value, $major, $minor,
788: $homecourses, $ids )
789:
790: releasereqd_check() will determine if a LON-CAPA version (defined in the
791: $major,$minor args passed) is not too old to allow use of a role in a
792: course ($cnum,$cdom args passed), if at least one of the following applies:
793: (a) the course is a Community, (b) the course's home server is *not* the
794: current server, or (c) cached course information is not stale.
795:
796: For the case where none of these apply, the course is added to the
797: $homecourse hash ref (keys = courseIDs, values = array of a hash of roles).
798: The $homecourse hash ref is for courses for which the current server is the
799: home server. LON-CAPA version requirements are checked elsewhere for the
800: items in $homecourse.
801:
802:
803: =item check_homecourses( $homecourses, $regexp, $count, $range, $start, $end,
804: $major, $minor )
805:
806: check_homecourses() will retrieve course information for those courses which
807: are keys of the $homecourses hash ref (first arg). The nohist_courseids.db
808: GDBM file is tied and course information for each course retrieved. Last
809: visit (lasttime key) is also retrieved for each, and cached values updated
810: for any courses last visited less than 24 hours ago. Cached values are also
811: updated for any courses included in the $homecourses hash ref.
812:
813: The reason for the 24 hours constraint is that the cron entry in
814: /etc/cron.d/loncapa for /home/httpd/perl/refresh_courseids_db.pl causes
815: cached course information to be updated nightly for courses with activity
816: within the past 24 hours.
817:
818: Role information for the user (included in a ref to an array of hashes as the
819: value for each key in $homecourses) is appended to the result returned by the
820: routine, which will in turn be appended to the string returned to the client
821: hosting the user's session.
822:
823:
824: =item useable_role( $reqdmajor, $reqdminor, $major, $minor )
825:
826: useable_role() will compare the LON-CAPA version required by a course with
827: the version available on the client server. If the client server's version
828: is compatible, 1 will be returned.
829:
830:
831: =item get_courseinfo_hash( $cnum, $cdom, $home )
832:
833: get_courseinfo_hash() is used to retrieve course information from the db
834: file: nohist_courseids.db for a course for which the current server is *not*
835: the home server.
836:
837: A hash of a hash will be retrieved. The outer hash contains a single key --
838: courseID -- for the course for which the data are being requested.
839: The contents of the inner hash, for that single item in the outer hash
840: are returned (and cached in memcache for 10 minutes).
841:
842:
843:
844: =back
845:
846: =head1 BUGS
847:
848: No known bugs at this time.
849:
850: =head1 SEE ALSO
851:
852: L<Apache::lonnet>, L<lond>
853:
854: =cut
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