1: # The LearningOnline Network
2: # Basic LTI Authentication Module
3: #
4: # $Id: ltiauth.pm,v 1.1 2017/12/06 01:53:56 raeburn 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:
29: package Apache::ltiauth;
30:
31: use strict;
32: use LONCAPA qw(:DEFAULT :match);
33: use Apache::Constants qw(:common :http);
34: use Net::OAuth;
35: use Apache::lonlocal;
36: use Apache::lonnet;
37: use Apache::loncommon;
38: use Apache::lonacc;
39:
40: sub handler {
41: my $r = shift;
42: my $requri = $r->uri;
43: #
44: # Retrieve data POSTed by LTI Consumer on launch
45: #
46: &Apache::lonacc::get_posted_cgi($r);
47: my $params = {};
48: foreach my $key (sort(keys(%env))) {
49: if ($key =~ /^form\.(.+)$/) {
50: $params->{$1} = $env{$key};
51: }
52: }
53:
54: unless (keys(%{$params})) {
55: &invalid_request($r,1);
56: return OK;
57: }
58:
59: unless ($params->{'oauth_consumer_key'} &&
60: $params->{'oauth_nonce'} &&
61: $params->{'oauth_timestamp'} &&
62: $params->{'oauth_version'} &&
63: $params->{'oauth_signature'} &&
64: $params->{'oauth_signature_method'}) {
65: &invalid_request($r,2);
66: return OK;
67: }
68:
69: #
70: # Retrieve "internet domains" for all this institution's LON-CAPA
71: # nodes.
72: #
73: my ($udom,$uname,$uhome,$cdom,$cnum,$symb,$mapurl,@intdoms);
74: my $lonhost = $r->dir_config('lonHostID');
75: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
76: if (ref($internet_names) eq 'ARRAY') {
77: @intdoms = @{$internet_names};
78: }
79:
80: #
81: # For user who launched LTI in Consumer, determine user's domain in
82: # LON-CAPA.
83: #
84: # Order is:
85: #
86: # (a) from custom_userdomain item in POSTed data
87: # (b) from lis_person_sourcedid in POSTed data
88: # (c) from default "log-in" domain for node
89: # (can support multidomain servers, where specific domain is
90: # first part of hostname).
91: #
92: # Note: "internet domain" for user's domain must be one of the
93: # "internet domain(s)" for the institution's LON-CAPA servers.
94: #
95: if (exists($params->{'custom_userdomain'})) {
96: if ($params->{'custom_userdomain'} =~ /^$match_domain$/) {
97: my $uprimary_id = &Apache::lonnet::domain($params->{'custom_userdomain'},'primary');
98: if ($uprimary_id ne '') {
99: my $uintdom = &Apache::lonnet::internet_dom($uprimary_id);
100: if (($uintdom ne '') && (grep(/^\Q$uintdom\E$/,@intdoms))) {
101: $udom = $params->{'custom_userdomain'};
102: }
103: }
104: }
105: }
106: my $defdom = &Apache::lonnet::default_login_domain();
107: my ($domain,$possuname,$possudom,$possmapuser);
108: if ($env{'form.lis_person_sourcedid'} =~ /^($match_username)\:($match_domain)$/) {
109: ($possuname,$possudom) = ($1,$2);
110: if ($udom eq '') {
111: my $uintdom = &Apache::lonnet::domain($possudom,'primary');
112: if (($uintdom ne '') && (grep(/^\Q$uintdom\E$/,@intdoms))) {
113: $udom = $possudom;
114: $possmapuser = 'lis_person_sourcedid';
115: } else {
116: $udom = $defdom;
117: }
118: } elsif ($udom eq $possudom) {
119: $possmapuser = 'lis_person_sourcedid';
120: }
121: }
122: unless ($possuname) {
123: if ($env{'form.lis_person_sourcedid'} =~ /^$match_username$/) {
124: $possuname = $env{'form.lis_person_sourcedid'};
125: $possmapuser = 'lis_person_sourcedid';
126: } elsif ($env{'form.lis_person_contact_email_primary'} =~ /^$match_username$/) {
127: $possuname = $env{'form.lis_person_contact_email_primary'};
128: $possmapuser = 'lis_person_contact_email_primary';
129: }
130: unless ($udom) {
131: $udom = $defdom;
132: }
133: }
134:
135: #
136: # Determine course's domain in LON-CAPA
137: #
138: # Order is:
139: #
140: # (a) from custom_coursedomain item in POSTed data
141: # (b) from tail of requested URL (after /adm/lti) if it has format of a symb
142: # (c) from tail of requested URL (after /adm/lti) if it has format of a map
143: # (d) from tail of requested URL (after /adm/lti) if it has format /domain/courseID
144: # (e) from tail of requested URL (after /adm/lti) if it has format /tiny/domain/...
145: # i.e., a shortened URL (see bug #6400) -- not implemented yet.
146: # (f) same as user's domain
147: #
148: # Request invalid if custom_coursedomain is defined and is inconsistent with
149: # domain contained in requested URL.
150: #
151: # Note: "internet domain" for course's domain must be one of the
152: # internet domains for the institution's LON-CAPA servers.
153: #
154:
155: if (exists($params->{'custom_coursedomain'})) {
156: if ($params->{'custom_coursedomain'} =~ /^$match_domain$/) {
157: my $cprimary_id = &Apache::lonnet::domain($params->{'custom_coursedomain'},'primary');
158: if ($cprimary_id ne '') {
159: my $cintdom = &Apache::lonnet::internet_dom($cprimary_id);
160: if (($cintdom ne '') && (grep(/^\Q$cintdom\E$/,@intdoms))) {
161: $cdom = $params->{'custom_coursedomain'};
162: }
163: }
164: }
165: }
166:
167: my ($tail) = ($requri =~ m{^/adm/lti(|/.*)$});
168: my $urlcnum;
169: if ($tail ne '') {
170: my $urlcdom;
171: if ($tail =~ m{^/uploaded/($match_domain)/($match_courseid)/(?:default|supplemental)(?:|_\d+)\.(?:sequence|page)(|___\d+___.+)$}) {
172: ($urlcdom,$urlcnum,my $rest) = ($1,$2,$3);
173: if (($cdom ne '') && ($cdom ne $urlcdom)) {
174: &invalid_request($r,3);
175: return OK;
176: }
177: if ($rest eq '') {
178: $mapurl = $tail;
179: } else {
180: $symb = $tail;
181: $symb =~ s{^/+}{};
182: }
183: #FIXME Need to handle encrypted URLs
184: } elsif ($tail =~ m{^/($match_domain)/($match_courseid)$}) {
185: ($urlcdom,$urlcnum) = ($1,$2);
186: if (($cdom ne '') && ($cdom ne $urlcdom)) {
187: &invalid_request($r,4);
188: return OK;
189: }
190: }
191: if (($cdom eq '') && ($urlcdom ne '')) {
192: my $cprimary_id = &Apache::lonnet::domain($urlcdom,'primary');
193: if ($cprimary_id ne '') {
194: my $cintdom = &Apache::lonnet::internet_dom($cprimary_id);
195: if (($cintdom ne '') && (grep(/^\Q$cintdom\E$/,@intdoms))) {
196: $cdom = $urlcdom;
197: }
198: } else {
199: $urlcnum = '';
200: }
201: }
202: }
203: if ($cdom eq '') {
204: if ($udom ne '') {
205: $cdom = $udom;
206: } else {
207: $cdom = $defdom;
208: }
209: }
210:
211: #
212: # Retrieve information for LTI Consumers in course domain
213: # and populate hash -- %lti_by_key -- for which keys
214: # are those defined in domain configuration for LTI.
215: #
216:
217: my %lti = &Apache::lonnet::get_domain_lti($cdom,'provider');
218: unless (keys(%lti) > 0) {
219: &invalid_request($r,5);
220: return OK;
221: }
222: my %lti_by_key;
223: if (keys(%lti)) {
224: foreach my $id (keys(%lti)) {
225: if (ref($lti{$id}) eq 'HASH') {
226: my $key = $lti{$id}{'key'};
227: push(@{$lti_by_key{$key}},$id);
228: }
229: }
230: }
231:
232: #
233: # Verify the signed request using the secret for those
234: # Consumers for which the key in the POSTed data matches
235: # keys in the domain configuration for LTI.
236: #
237: my $hostname = $r->hostname;
238: my $protocol = 'http';
239: if ($ENV{'SERVER_PORT'} == 443) {
240: $protocol = 'https';
241: }
242:
243: my $itemid;
244: my $key = $params->{'oauth_consumer_key'};
245: my @ltiroles;
246: if (ref($lti_by_key{$key}) eq 'ARRAY') {
247: foreach my $id (@{$lti_by_key{$key}}) {
248: if (ref($lti{$id}) eq 'HASH') {
249: my $secret = $lti{$id}{'secret'};
250: my $request = Net::OAuth->request('request token')->from_hash($params,
251: request_url => $protocol.'://'.$hostname.$requri,
252: request_method => $env{'request.method'},
253: consumer_secret => $secret,);
254: if ($request->verify()) {
255: $itemid = $id;
256: last;
257: }
258: }
259: }
260: }
261:
262: #
263: # Request is invalid if the signed request could not be verified
264: # for the Consumer key and Consumer secret from the domain
265: # configuration in LON-CAPA for that LTI Consumer.
266: #
267: unless (($itemid) && (ref($lti{$itemid}) eq 'HASH')) {
268: &invalid_request($r,6);
269: return OK;
270: }
271:
272: #
273: # Determine if nonce in POSTed data has expired.
274: # If unexpired, confirm it has not already been used.
275: #
276: unless (&check_nonce($r,$params->{'oauth_nonce'},$params->{'oauth_timestamp'},$lti{$itemid}{'lifetime'},$cdom)) {
277: &invalid_request($r,7);
278: return OK;
279: }
280:
281: #
282: # Determinine if source of username matches requirement from the
283: # domain configuration for the specific LTI Consumer.
284: #
285:
286: if ($lti{$itemid}{'mapuser'} eq $possmapuser) {
287: $uname = $possuname;
288: } elsif ($lti{$itemid}{'mapuser'} eq 'lis_person_sourcedid') {
289: if ($params->{'lis_person_sourcedid'} =~ /^$match_username$/) {
290: $uname = $possuname;
291: }
292: } elsif ($lti{$itemid}{'mapuser'} eq 'lis_person_contact_email_primary') {
293: if ($params->{'lis_person_contact_email_primary'} =~ /^$match_username$/) {
294: $uname = $params->{'lis_person_contact_email_primary'};
295: }
296: } elsif (exists($params->{$lti{$itemid}{'mapuser'}})) {
297: if ($params->{$lti{$itemid}{'mapuser'}} =~ /^$match_username$/) {
298: $uname = $params->{$lti{$itemid}{'mapuser'}};
299: }
300: }
301:
302: #
303: # Determine the courseID of the LON-CAPA course to which the
304: # launch of LON-CAPA should provide access.
305: #
306: # Order is:
307: #
308: # (a) from course mapping (if the link between Consumer "course" and
309: # Provider "course" has been established previously).
310: # (b) from tail of requested URL (after /adm/lti) if it has format of a symb
311: # (c) from tail of requested URL (after /adm/lti) if it has format of a map
312: # (d) from tail of requested URL (after /adm/lti) if it has format /domain/courseID
313: # (e) from tail of requested URL (after /adm/lti) if it has format /tiny/domain/...
314: # i.e., a shortened URL (see bug #6400) -- not implemented yet.
315: #
316: # If Consumer course included in POSTed data points as a target course which
317: # has a format which matches a LON-CAPA courseID, but the course does not
318: # exist, the request is invalid.
319: #
320:
321: my ($sourcecrs,%consumers);
322: if ($lti{$itemid}{'mapcrs'} eq 'course_offering_sourcedid') {
323: $sourcecrs = $params->{'course_offering_sourcedid'};
324: } elsif ($lti{$itemid}{'mapcrs'} eq 'context_id') {
325: $sourcecrs = $params->{'context_id'};
326: } elsif ($lti{$itemid}{'mapcrs'} ne '') {
327: $sourcecrs = $params->{$lti{$itemid}{'mapcrs'}};
328: }
329:
330: my $posscnum;
331: if ($sourcecrs ne '') {
332: %consumers = &Apache::lonnet::get_dom('lticonsumers',[$sourcecrs],$cdom);
333: if (exists($consumers{$sourcecrs})) {
334: if ($consumers{$sourcecrs} =~ /^$match_courseid$/) {
335: my $crshome = &Apache::lonnet::homeserver($consumers{$sourcecrs},$cdom);
336: if ($crshome =~ /(con_lost|no_host|no_such_host)/) {
337: &invalid_request($r,8);
338: return OK;
339: } else {
340: $posscnum = $consumers{$sourcecrs};
341: }
342: }
343: }
344: }
345:
346: if ($urlcnum ne '') {
347: if ($posscnum ne '') {
348: if ($posscnum ne $urlcnum) {
349: &invalid_request($r,9);
350: return OK;
351: } else {
352: $cnum = $posscnum;
353: }
354: } else {
355: my $crshome = &Apache::lonnet::homeserver($urlcnum,$cdom);
356: if ($crshome =~ /(con_lost|no_host|no_such_host)/) {
357: &invalid_request($r,10);
358: return OK;
359: } else {
360: $cnum = $urlcnum;
361: }
362: }
363: } elsif ($posscnum ne '') {
364: $cnum = $posscnum;
365: }
366:
367: #
368: # Get LON-CAPA role to use from role-mapping of Consumer roles
369: # defined in domain configuration for the appropriate LTI
370: # Consumer.
371: #
372: # If multiple LON-CAPA roles are indicated, choose based
373: # on the order: cc, in, ta, ep, st
374: #
375:
376: my $reqrole;
377:
378: my @roleorder = ('cc','in','ta','ep','st');
379: if ($params->{'roles'} =~ /,/) {
380: @ltiroles = split(/\s*,\s*/,$params->{'role'});
381: } else {
382: my $singlerole = $params->{'roles'};
383: $singlerole =~ s/^\s|\s+$//g;
384: @ltiroles = ($singlerole);
385: }
386: if (@ltiroles) {
387: if (ref($lti{$itemid}{maproles}) eq 'HASH') {
388: my %possroles;
389: map { $possroles{$lti{$itemid}{maproles}{$_}} = 1; } @ltiroles;
390: my @possibles = keys(%possroles);
391: if (@possibles == 1) {
392: if (grep(/^\Q$possibles[0]\E$/,@roleorder)) {
393: $reqrole = $possibles[0];
394:
395: }
396: } elsif (@possibles > 1) {
397: foreach my $item (@roleorder) {
398: if ($possroles{$item}) {
399: $reqrole = $item;
400: last;
401: }
402: }
403: }
404: }
405: }
406:
407: #
408: # If no LON-CAPA username -- is user allowed to create one?
409: #
410:
411: my $selfcreate;
412: if (($uname ne '') && ($udom ne '')) {
413: $uhome = &Apache::lonnet::homeserver($uname,$udom);
414: if ($uhome =~ /(con_lost|no_host|no_such_host)/) {
415: &Apache::lonnet::logthis(" LTI authorized unknown user $uname:$udom ");
416: if (ref($lti{$itemid}{'makeuser'}) eq 'ARRAY') {
417: if (@{$lti{$itemid}{'makeuser'}} > 0) {
418: foreach my $ltirole (@ltiroles) {
419: if (grep(/^\Q$ltirole\E$/,@{$lti{$itemid}{'makeuser'}})) {
420: $selfcreate = 1;
421: }
422: }
423: }
424: }
425: if ($selfcreate) {
426: #FIXME Do user creation here.
427: return OK
428: } else {
429: &invalid_request($r,11);
430: return OK;
431: }
432: }
433: } else {
434: &invalid_request($r,12);
435: return OK;
436: }
437:
438: #
439: # If no LON-CAPA course available, check if domain's configuration
440: # for the specific LTI Consumer allows a new course to be created
441: # (requires role in Consumer to be: Instructor).
442: #
443:
444: if ($cnum eq '') {
445: if ((@ltiroles) && (grep(/^Instructor$/,@ltiroles)) &&
446: ($lti{$itemid}{'mapcrs'})) {
447: #FIXME Create a new LON-CAPA course here.
448: return OK;
449: } else {
450: &invalid_request($r,13);
451: return OK;
452: }
453: }
454:
455: #
456: # If LON-CAPA course is a Community, and LON-CAPA role
457: # indicated is cc, change role indicated to co.
458: #
459:
460: if ($reqrole eq 'cc') {
461: if (($cdom ne '') && ($cnum ne '')) {
462: my %crsenv = &Apache::lonnet::coursedescription($cnum.'_'.$cdom,{ 'one_time' => 1,});
463: if ($crsenv{'type'} eq 'Community') {
464: $reqrole = 'co';
465: }
466: }
467: }
468:
469: #
470: # Determine if user has required LON-CAPA role
471: # in the mapped LON-CAPA course.
472: #
473:
474: my $role;
475: my %crsroles = &Apache::lonnet::get_my_roles($uname,$udom,'userroles',undef,[$reqrole],[$cdom]);
476: if (exists($crsroles{$cnum.':'.$cdom.':'.$reqrole})) {
477: $role = $reqrole.'./'.$cdom.'/'.$cnum;
478: #FIXME Need to accommodate sections
479: } elsif (ref($lti{$itemid}{'selfenroll'}) eq 'ARRAY') {
480: if (grep(/^\Q$reqrole\E$/,@{$lti{$itemid}{'selfenroll'}})) {
481: #FIXME Do self-enrollment here
482: return OK;
483: } else {
484: &invalid_request($r,14);
485: }
486: }
487:
488: #
489: # Store consumer-to-LON-CAPA course mapping
490: #
491: if (($sourcecrs ne '') && ($consumers{$sourcecrs} eq '') && ($cnum ne '')) {
492: &Apache::lonnet::put_dom('lticonsumers',{ $sourcecrs => $cnum },$cdom);
493: }
494:
495: #
496: # Check if user should be hosted here or switched to another server.
497: #
498:
499: &Apache::lonnet::logthis(" LTI authorized user: $uname:$udom role: $role course: $cnum:$cdom");
500: $r->user($uname);
501: my ($is_balancer,$otherserver,$hosthere);
502: ($is_balancer,$otherserver) =
503: &Apache::lonnet::check_loadbalancing($uname,$udom,'login');
504: if ($is_balancer) {
505: if ($otherserver eq '') {
506: my $lowest_load;
507: ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($udom);
508: if ($lowest_load > 100) {
509: $otherserver = &Apache::lonnet::spareserver($lowest_load,$lowest_load,1,$udom);
510: }
511: }
512: if ($otherserver ne '') {
513: my @hosts = &Apache::lonnet::current_machine_ids();
514: if (grep(/^\Q$otherserver\E$/,@hosts)) {
515: $hosthere = $otherserver;
516: }
517: }
518: }
519: if (($is_balancer) && (!$hosthere)) {
520: # login but immediately go to switch server.
521: &Apache::lonauth::success($r,$uname,$udom,$uhome,'noredirect');
522: if ($symb) {
523: $env{'form.symb'} = $symb;
524: }
525: if ($role) {
526: $env{'form.role'} = $role;
527: }
528: if ($lti{$itemid}{'passback'}) {
529: if ($params->{'lis_result_sourcedid'}) {
530: $env{'request.lti.passbackid'} = $params->{'lis_result_sourcedid'};
531: }
532: if ($params->{'lis_outcome_service_url'}) {
533: $env{'request.lti.passbackurl'} = $params->{'lis_outcome_service_url'};
534: }
535: }
536: if (($lti{$itemid}{'roster'}) && (grep(/^Instructor$/,@ltiroles))) {
537: if ($params->{'ext_ims_lis_memberships_id'}) {
538: $env{'request.lti.rosterid'} = $params->{'ext_ims_lis_memberships_id'};
539: }
540: if ($params->{'ext_ims_lis_memberships_url'}) {
541: $env{'request.lti.rosterurl'} = $params->{'ext_ims_lis_memberships_url'};
542: }
543: }
544: $env{'request.lti.login'} = 1;
545: foreach my $key (%{$params}) {
546: delete($env{'form.'.$key});
547: }
548: my $redirecturl = '/adm/switchserver';
549: if ($otherserver ne '') {
550: $redirecturl .= '?otherserver='.$otherserver;
551: }
552: $r->internal_redirect($redirecturl);
553: $r->set_handlers('PerlHandler'=> undef);
554: } else {
555: # need to login them in, so generate the need data that
556: # migrate expects to do login
557: foreach my $key (%{$params}) {
558: delete($env{'form.'.$key});
559: }
560: my $ip = $r->get_remote_host();
561: my %info=('ip' => $ip,
562: 'domain' => $udom,
563: 'username' => $uname,
564: 'server' => $lonhost,
565: 'lti.login' => 1,
566: );
567: if ($role) {
568: $info{'role'} = $role;
569: }
570: if ($symb) {
571: $info{'symb'} = $symb;
572: }
573: if ($lti{$itemid}{'passback'}) {
574: if ($params->{'lis_result_sourcedid'}) {
575: $info{'lti.passbackid'} = $params->{'lis_result_sourcedid'}
576: }
577: if ($params->{'lis_outcome_service_url'}) {
578: $info{'lti.passbackurl'} = $params->{'lis_outcome_service_url'}
579: }
580: }
581: if (($lti{$itemid}{'roster'}) && (grep(/^Instructor$/,@ltiroles))) {
582: if ($params->{'ext_ims_lis_memberships_id'}) {
583: $info{'lti.rosterid'} = $params->{'ext_ims_lis_memberships_id'};
584: }
585: if ($params->{'ext_ims_lis_memberships_url'}) {
586: $info{'lti.rosterurl'} = $params->{'ext_ims_lis_memberships_url'};
587: }
588: }
589: unless ($info{'symb'}) {
590: if ($mapurl) {
591: $info{'origurl'} = $mapurl;
592: if ($mapurl =~ m{/default_\d+\.sequence$}) {
593: $info{'origurl'} .= (($mapurl =~/\?/)?'&':'?').'navmap=1';
594: }
595: } else {
596: unless ($tail eq '/adm/roles') {
597: $info{'origurl'} = '/adm/navmaps';
598: }
599: }
600: }
601: if (($is_balancer) && ($hosthere)) {
602: $info{'noloadbalance'} = $hosthere;
603: }
604: my $token = &Apache::lonnet::tmpput(\%info,$lonhost);
605: $env{'form.token'} = $token;
606: $r->internal_redirect('/adm/migrateuser');
607: $r->set_handlers('PerlHandler'=> undef);
608: }
609: return OK;
610: }
611:
612: sub check_nonce {
613: my ($r,$nonce,$timestamp,$lifetime,$domain) = @_;
614: if (($timestamp eq '') || ($timestamp =~ /^\D/) || ($lifetime eq '') || ($lifetime =~ /\D/) || ($domain eq '')) {
615: return 0;
616: }
617: my $now = time;
618: if (($timestamp) && ($timestamp < ($now - $lifetime))) {
619: return 0;
620: }
621: if ($nonce eq '') {
622: return 0;
623: }
624: my $lonltidir = $r->dir_config('lonLTIDir');
625: if (-e "$lonltidir/$domain/$nonce") {
626: return 0;
627: } else {
628: unless (-e "$lonltidir/$domain") {
629: mkdir("$lonltidir/$domain",0755);
630: }
631: if (open(my $fh,'>',"$lonltidir/$domain/$nonce")) {
632: print $fh $now;
633: close($fh);
634: } else {
635: return 0;
636: }
637: }
638: return 1;
639: }
640:
641: sub invalid_request {
642: my ($r,$num) = @_;
643: &Apache::loncommon::content_type($r,'text/html');
644: $r->send_http_header;
645: if ($r->header_only) {
646: return;
647: }
648: &Apache::lonlocal::get_language_handle($r);
649: $r->print(
650: &Apache::loncommon::start_page('Invalid LTI call').
651: &mt('Invalid LTI call [_1]',$num).
652: &Apache::loncommon::end_page());
653: return;
654: }
655:
656: 1;
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