1: # The LearningOnline Network
2: # Basic LTI Authentication Module
3: #
4: # $Id: ltiauth.pm,v 1.31 2022/02/02 00:31:16 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 Apache::lonlocal;
35: use Apache::lonnet;
36: use Apache::loncommon;
37: use Apache::lonacc;
38: use Apache::lonrequestcourse;
39: use LONCAPA::ltiutils;
40:
41: sub handler {
42: my $r = shift;
43: my $requri = $r->uri;
44: my $hostname = $r->hostname;
45: #
46: # Check for existing session, and temporarily delete any form items
47: # in %env, if session exists
48: #
49: my %savedform;
50: my $handle = &Apache::lonnet::check_for_valid_session($r);
51: if ($handle ne '') {
52: foreach my $key (sort(keys(%env))) {
53: if ($key =~ /^form\.(.+)$/) {
54: $savedform{$1} = $env{$key};
55: delete($env{$key});
56: }
57: }
58: }
59: #
60: # Retrieve data POSTed by LTI launch
61: #
62: &Apache::lonacc::get_posted_cgi($r);
63: my $params = {};
64: foreach my $key (sort(keys(%env))) {
65: if ($key =~ /^form\.(.+)$/) {
66: $params->{$1} = $env{$key};
67: }
68: }
69: #
70: # Check for existing session, and restore temporarily
71: # deleted form items to %env, if session exists.
72: #
73: if ($handle ne '') {
74: if (keys(%savedform)) {
75: foreach my $key (sort(keys(%savedform))) {
76: $env{'form.'.$key} = $savedform{$key};
77: }
78: }
79: }
80:
81: unless (keys(%{$params})) {
82: &invalid_request($r,1);
83: return OK;
84: }
85:
86: unless ($params->{'oauth_consumer_key'} &&
87: $params->{'oauth_nonce'} &&
88: $params->{'oauth_timestamp'} &&
89: $params->{'oauth_version'} &&
90: $params->{'oauth_signature'} &&
91: $params->{'oauth_signature_method'}) {
92: &invalid_request($r,2);
93: return OK;
94: }
95:
96: #
97: # Retrieve "internet domains" for all this institution's LON-CAPA
98: # nodes.
99: #
100: my @intdoms;
101: my $lonhost = $r->dir_config('lonHostID');
102: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
103: if (ref($internet_names) eq 'ARRAY') {
104: @intdoms = @{$internet_names};
105: }
106: #
107: # Determine course's domain in LON-CAPA
108: # for basic launch using key and secret managed
109: # in LON-CAPA course (i.e., uri begins /adm/launch)
110: #
111:
112: my ($cdom,$cnum);
113:
114: # Note: "internet domain" for course's domain must be one of the
115: # internet domains for the institution's LON-CAPA servers.
116: #
117: if ($requri =~ m{^/adm/launch(|/.*)$}) {
118: my $tail = $1;
119: if ($tail =~ m{^/tiny/($match_domain)/(\w+)$}) {
120: my ($urlcdom,$urlcnum) = &course_from_tinyurl($tail);
121: if (($urlcdom ne '') && ($urlcnum ne '')) {
122: $cdom = $urlcdom;
123: $cnum = $urlcnum;
124: my $primary_id = &Apache::lonnet::domain($cdom,'primary');
125: if ($primary_id ne '') {
126: my $intdom = &Apache::lonnet::internet_dom($primary_id);
127: if (($intdom ne '') && (grep(/^\Q$intdom\E$/,@intdoms))) {
128: #
129: # Verify the signed request using the secret for LTI link
130: # protectors for which the key in the POSTed data matches
131: # keys in the course configuration.
132: #
133: # Request is invalid if the signed request could not be verified
134: # for the key and secret from LON-CAPA course configuration for
135: # LTI link protectors or from LON-CAPA configuration for the
136: # course's domain if there are LTI Providers which may be used.
137: #
138: # Determine if nonce in POSTed data has expired.
139: # If unexpired, confirm it has not already been used.
140: #
141: # Retrieve information for LTI link protectors in course
142: # where url was /adm/launch/tiny/$cdom/$uniqueid
143: #
144:
145: my ($itemid,$ltitype,%crslti);
146: $itemid = &get_lti_itemid($requri,$hostname,$params,$cdom,$cnum,'deeplink');
147: if ($itemid) {
148: %crslti = &Apache::lonnet::get_course_lti($cnum,$cdom,'provider');
149: }
150: if (($itemid) && (ref($crslti{$itemid}) eq 'HASH')) {
151: $ltitype = 'c';
152: unless (&LONCAPA::ltiutils::check_nonce($params->{'oauth_nonce'},$params->{'oauth_timestamp'},
153: $crslti{$itemid}{'lifetime'},$cdom,$r->dir_config('lonLTIDir'))) {
154: &invalid_request($r,3);
155: return OK;
156: }
157: } else {
158: my %lti;
159: $itemid = &get_lti_itemid($requri,$hostname,$params,$cdom,'','deeplink');
160: if ($itemid) {
161: %lti = &Apache::lonnet::get_domain_lti($cdom,'provider');
162: }
163: if (($itemid) && (ref($lti{$itemid}) eq 'HASH')) {
164: $ltitype = 'd';
165: unless (&LONCAPA::ltiutils::check_nonce($params->{'oauth_nonce'},$params->{'oauth_timestamp'},
166: $lti{$itemid}{'lifetime'},$cdom,
167: $r->dir_config('lonLTIDir'))) {
168: &invalid_request($r,4);
169: return OK;
170: }
171: }
172: }
173: if ($itemid) {
174: foreach my $key (%{$params}) {
175: delete($env{'form.'.$key});
176: }
177: my $ltoken = &Apache::lonnet::tmpput({'linkprot' => $itemid.$ltitype.':'.$tail},
178: $lonhost,'link');
179: if ($ltoken) {
180: $r->internal_redirect($tail.'?ltoken='.$ltoken);
181: $r->set_handlers('PerlHandler'=> undef);
182: } else {
183: &invalid_request($r,5);
184: }
185: } else {
186: &invalid_request($r,6);
187: }
188: } else {
189: &invalid_request($r,7);
190: }
191: } else {
192: &invalid_request($r,8);
193: }
194: } else {
195: &invalid_request($r,9);
196: }
197: } else {
198: &invalid_request($r,10);
199: }
200: return OK;
201: }
202:
203: my ($udom,$uname,$uhome,$symb,$mapurl);
204:
205: #
206: # For user who launched LTI in Consumer, determine user's domain in
207: # LON-CAPA.
208: #
209: # Order is:
210: #
211: # (a) from custom_userdomain item in POSTed data
212: # (b) from lis_person_sourcedid in POSTed data
213: # (c) from default "log-in" domain for node
214: # (can support multidomain servers, where specific domain is
215: # first part of hostname).
216: #
217: # Note: "internet domain" for user's domain must be one of the
218: # "internet domain(s)" for the institution's LON-CAPA servers.
219: #
220: if (exists($params->{'custom_userdomain'})) {
221: if ($params->{'custom_userdomain'} =~ /^$match_domain$/) {
222: my $uprimary_id = &Apache::lonnet::domain($params->{'custom_userdomain'},'primary');
223: if ($uprimary_id ne '') {
224: my $uintdom = &Apache::lonnet::internet_dom($uprimary_id);
225: if (($uintdom ne '') && (grep(/^\Q$uintdom\E$/,@intdoms))) {
226: $udom = $params->{'custom_userdomain'};
227: }
228: }
229: }
230: }
231: my $defdom = &Apache::lonnet::default_login_domain();
232: my ($domain,$possuname,$possudom,$possmapuser);
233: if ($env{'form.lis_person_sourcedid'} =~ /^($match_username)\:($match_domain)$/) {
234: ($possuname,$possudom) = ($1,$2);
235: if ($udom eq '') {
236: my $uintdom = &Apache::lonnet::domain($possudom,'primary');
237: if (($uintdom ne '') && (grep(/^\Q$uintdom\E$/,@intdoms))) {
238: $udom = $possudom;
239: $possmapuser = 'lis_person_sourcedid';
240: } else {
241: $udom = $defdom;
242: }
243: } elsif ($udom eq $possudom) {
244: $possmapuser = 'lis_person_sourcedid';
245: }
246: }
247: unless ($possuname) {
248: if ($env{'form.lis_person_sourcedid'} =~ /^$match_username$/) {
249: $possuname = $env{'form.lis_person_sourcedid'};
250: $possmapuser = 'lis_person_sourcedid';
251: } elsif ($env{'form.lis_person_contact_email_primary'} =~ /^$match_username$/) {
252: $possuname = $env{'form.lis_person_contact_email_primary'};
253: $possmapuser = 'lis_person_contact_email_primary';
254: }
255: unless ($udom) {
256: $udom = $defdom;
257: }
258: }
259:
260: #
261: # Determine course's domain in LON-CAPA
262: #
263: # Order is:
264: #
265: # (a) from custom_coursedomain item in POSTed data
266: # (b) from tail of requested URL (after /adm/lti/) if it has format of a symb
267: # (c) from tail of requested URL (after /adm/lti) if it has format of a map
268: # (d) from tail of requested URL (after /adm/lti) if it has format /domain/courseID
269: # (e) from tail of requested URL (after /adm/lti) if it has format /tiny/domain/\w+
270: # i.e., a shortened URL (see bug #6400).
271: # (f) same as user's domain
272: #
273: # Request invalid if custom_coursedomain is defined and is inconsistent with
274: # domain contained in requested URL.
275: #
276: # Note: "internet domain" for course's domain must be one of the
277: # internet domains for the institution's LON-CAPA servers.
278: #
279:
280: if (exists($params->{'custom_coursedomain'})) {
281: if ($params->{'custom_coursedomain'} =~ /^$match_domain$/) {
282: my $cprimary_id = &Apache::lonnet::domain($params->{'custom_coursedomain'},'primary');
283: if ($cprimary_id ne '') {
284: my $cintdom = &Apache::lonnet::internet_dom($cprimary_id);
285: if (($cintdom ne '') && (grep(/^\Q$cintdom\E$/,@intdoms))) {
286: $cdom = $params->{'custom_coursedomain'};
287: }
288: }
289: }
290: }
291:
292: my ($tail) = ($requri =~ m{^/adm/lti(|/.*)$});
293: my $urlcnum;
294: if ($tail ne '') {
295: my $urlcdom;
296: if ($tail =~ m{^/uploaded/($match_domain)/($match_courseid)/(?:default|supplemental)(?:|_\d+)\.(?:sequence|page)(|___\d+___.+)$}) {
297: ($urlcdom,$urlcnum,my $rest) = ($1,$2,$3);
298: if (($cdom ne '') && ($cdom ne $urlcdom)) {
299: &invalid_request($r,11);
300: return OK;
301: }
302: if ($rest eq '') {
303: $mapurl = $tail;
304: } else {
305: $symb = $tail;
306: $symb =~ s{^/}{};
307: }
308: } elsif ($tail =~ m{^/res/(?:$match_domain)/(?:$match_username)/.+\.(?:sequence|page)(|___\d+___.+)$}) {
309: if ($1 eq '') {
310: $mapurl = $tail;
311: } else {
312: $symb = $tail;
313: $symb =~ s{^/res/}{};
314: }
315: } elsif ($tail =~ m{^/($match_domain)/($match_courseid)$}) {
316: ($urlcdom,$urlcnum) = ($1,$2);
317: if (($cdom ne '') && ($cdom ne $urlcdom)) {
318: &invalid_request($r,12);
319: return OK;
320: }
321: } elsif ($tail =~ m{^/tiny/($match_domain)/(\w+)$}) {
322: ($urlcdom,$urlcnum) = &course_from_tinyurl($tail);
323: if (($urlcdom eq '') || ($urlcnum eq '')) {
324: &invalid_request($r,13);
325: return OK;
326: }
327: }
328: if (($cdom eq '') && ($urlcdom ne '')) {
329: my $cprimary_id = &Apache::lonnet::domain($urlcdom,'primary');
330: if ($cprimary_id ne '') {
331: my $cintdom = &Apache::lonnet::internet_dom($cprimary_id);
332: if (($cintdom ne '') && (grep(/^\Q$cintdom\E$/,@intdoms))) {
333: $cdom = $urlcdom;
334: }
335: } else {
336: $urlcnum = '';
337: }
338: }
339: }
340: if ($cdom eq '') {
341: if ($udom ne '') {
342: $cdom = $udom;
343: } else {
344: $cdom = $defdom;
345: }
346: }
347:
348: #
349: # Retrieve information for LTI Consumers in course's domain
350: # defined in domain configuration for LTI.
351: #
352: # Verify the signed request using the secret for those
353: # Consumers for which the key in the POSTed data matches
354: # keys in the course configuration or the domain configuration
355: # for LTI.
356: #
357:
358: my %lti;
359: my $itemid = &get_lti_itemid($requri,$hostname,$params,$cdom);
360: if ($itemid) {
361: %lti = &Apache::lonnet::get_domain_lti($cdom,'provider');
362: }
363:
364: #
365: # Request is invalid if the signed request could not be verified
366: # for the Consumer key and Consumer secret from the domain
367: # configuration in LON-CAPA for that LTI Consumer.
368: #
369: unless (($itemid) && (ref($lti{$itemid}) eq 'HASH')) {
370: &invalid_request($r,14);
371: return OK;
372: }
373:
374: #
375: # Determine if nonce in POSTed data has expired.
376: # If unexpired, confirm it has not already been used.
377: #
378: unless (&LONCAPA::ltiutils::check_nonce($params->{'oauth_nonce'},$params->{'oauth_timestamp'},
379: $lti{$itemid}{'lifetime'},$cdom,$r->dir_config('lonLTIDir'))) {
380: &invalid_request($r,15);
381: return OK;
382: }
383:
384: #
385: # Determine if a username is required from the domain
386: # configuration for the specific LTI Consumer
387: #
388:
389: if (!$lti{$itemid}{'requser'}) {
390: if ($tail =~ m{^/tiny/($match_domain)/(\w+)$}) {
391: my $ltitype = 'd';
392: foreach my $key (%{$params}) {
393: delete($env{'form.'.$key});
394: }
395: my $ltoken = &Apache::lonnet::tmpput({'linkprot' => $itemid.$ltitype.':'.$tail},
396: $lonhost);
397: if ($ltoken) {
398: $r->internal_redirect($tail.'?ltoken='.$ltoken);
399: $r->set_handlers('PerlHandler'=> undef);
400: } else {
401: &invalid_request($r,16);
402: }
403: } else {
404: &invalid_request($r,17);
405: }
406: return OK;
407: }
408:
409: #
410: # Determine if source of username matches requirement from the
411: # domain configuration for the specific LTI Consumer.
412: #
413:
414: if ($lti{$itemid}{'mapuser'} eq $possmapuser) {
415: $uname = $possuname;
416: } elsif ($lti{$itemid}{'mapuser'} eq 'lis_person_sourcedid') {
417: if ($params->{'lis_person_sourcedid'} =~ /^$match_username$/) {
418: $uname = $possuname;
419: }
420: } elsif ($lti{$itemid}{'mapuser'} eq 'lis_person_contact_email_primary') {
421: if ($params->{'lis_person_contact_email_primary'} =~ /^$match_username$/) {
422: $uname = $params->{'lis_person_contact_email_primary'};
423: }
424: } elsif (exists($params->{$lti{$itemid}{'mapuser'}})) {
425: if ($params->{$lti{$itemid}{'mapuser'}} =~ /^$match_username$/) {
426: $uname = $params->{$lti{$itemid}{'mapuser'}};
427: }
428: }
429:
430: #
431: # Determine the courseID of the LON-CAPA course to which the
432: # launch of LON-CAPA should provide access.
433: #
434: # Order is:
435: #
436: # (a) from course mapping (if the link between Consumer "course" and
437: # Provider "course" has been established previously).
438: # (b) from tail of requested URL (after /adm/lti/) if it has format of a symb
439: # (c) from tail of requested URL (after /adm/lti) if it has format of a map
440: # (d) from tail of requested URL (after /adm/lti) if it has format /domain/courseID
441: # (e) from tail of requested URL (after /adm/lti) if it has format /tiny/domain/\w+
442: # i.e., a shortened URL (see bug #6400).
443: #
444: # If Consumer course included in POSTed data points as a target course which
445: # has a format which matches a LON-CAPA courseID, but the course does not
446: # exist, the request is invalid.
447: #
448:
449: my ($sourcecrs,%consumers);
450: if ($lti{$itemid}{'mapcrs'} eq 'course_offering_sourcedid') {
451: $sourcecrs = $params->{'course_offering_sourcedid'};
452: } elsif ($lti{$itemid}{'mapcrs'} eq 'context_id') {
453: $sourcecrs = $params->{'context_id'};
454: } elsif ($lti{$itemid}{'mapcrs'} ne '') {
455: $sourcecrs = $params->{$lti{$itemid}{'mapcrs'}};
456: }
457:
458: my $posscnum;
459: if ($sourcecrs ne '') {
460: %consumers = &Apache::lonnet::get_dom('lticonsumers',[$sourcecrs],$cdom);
461: if (exists($consumers{$sourcecrs})) {
462: if ($consumers{$sourcecrs} =~ /^\Q$itemid:\E($match_courseid)$/) {
463: my $storedcnum = $1;
464: my $crshome = &Apache::lonnet::homeserver($storedcnum,$cdom);
465: if ($crshome =~ /(con_lost|no_host|no_such_host)/) {
466: &invalid_request($r,18);
467: return OK;
468: } else {
469: $posscnum = $storedcnum;
470: }
471: }
472: }
473: }
474:
475: if ($urlcnum ne '') {
476: if ($posscnum ne '') {
477: if ($posscnum ne $urlcnum) {
478: &invalid_request($r,19);
479: return OK;
480: } else {
481: $cnum = $posscnum;
482: }
483: } else {
484: my $crshome = &Apache::lonnet::homeserver($urlcnum,$cdom);
485: if ($crshome =~ /(con_lost|no_host|no_such_host)/) {
486: &invalid_request($r,20);
487: return OK;
488: } else {
489: $cnum = $urlcnum;
490: }
491: }
492: } elsif ($posscnum ne '') {
493: $cnum = $posscnum;
494: }
495:
496: #
497: # Get LON-CAPA role(s) to use from role-mapping of Consumer roles
498: # defined in domain configuration for the appropriate LTI
499: # Consumer.
500: #
501: # If multiple LON-CAPA roles are indicated for the current user,
502: # ordering (from first to last) is: cc/co, in, ta, ep, st.
503: #
504:
505: my (@ltiroles,@lcroles);
506: my @lcroleorder = ('cc','in','ta','ep','st');
507: my ($lcrolesref,$ltirolesref) =
508: &LONCAPA::ltiutils::get_lc_roles($params->{'roles'},
509: \@lcroleorder,
510: $lti{$itemid}{maproles});
511: if (ref($lcrolesref) eq 'ARRAY') {
512: @lcroles = @{$lcrolesref};
513: }
514: if (ref($ltirolesref) eq 'ARRAY') {
515: @ltiroles = @{$ltirolesref};
516: }
517:
518: #
519: # If no LON-CAPA username -- is user allowed to create one?
520: #
521:
522: my $selfcreate;
523: if (($uname ne '') && ($udom ne '')) {
524: $uhome = &Apache::lonnet::homeserver($uname,$udom);
525: if ($uhome =~ /(con_lost|no_host|no_such_host)/) {
526: &Apache::lonnet::logthis(" LTI authorized unknown user $uname:$udom ");
527: if (ref($lti{$itemid}{'makeuser'}) eq 'ARRAY') {
528: if (@{$lti{$itemid}{'makeuser'}} > 0) {
529: foreach my $ltirole (@ltiroles) {
530: if (grep(/^\Q$ltirole\E$/,@{$lti{$itemid}{'makeuser'}})) {
531: $selfcreate = 1;
532: last;
533: }
534: }
535: }
536: }
537: if ($selfcreate) {
538: my (%rulematch,%inst_results,%curr_rules,%got_rules,%alerts);
539: my $domdesc = &Apache::lonnet::domain($udom,'description');
540: my %data = (
541: 'permanentemail' => $env{'form.lis_person_contact_email_primary'},
542: 'firstname' => $env{'form.lis_person_name_given'},
543: 'lastname' => $env{'form.lis_person_name_family'},
544: 'fullname' => $env{'form.lis_person_name_full'},
545: );
546: my $result =
547: &LONCAPA::ltiutils::create_user($lti{$itemid},$uname,$udom,
548: $domdesc,\%data,\%alerts,\%rulematch,
549: \%inst_results,\%curr_rules,%got_rules);
550: if ($result eq 'notallowed') {
551: &invalid_request($r,21);
552: } elsif ($result eq 'ok') {
553: if (($ltiroles[0] eq 'Instructor') && ($lcroles[0] eq 'cc') && ($lti{$itemid}{'mapcrs'}) &&
554: ($lti{$itemid}{'makecrs'})) {
555: unless (&Apache::lonnet::usertools_access($uname,$udom,'lti','reload','requestcourses')) {
556: &Apache::lonnet::put('environment',{ 'requestcourses.lti' => 'autolimit=', },$udom,$uname);
557: }
558: }
559: } else {
560: &invalid_request($r,22);
561: return OK;
562: }
563: } else {
564: &invalid_request($r,23);
565: return OK;
566: }
567: }
568: } else {
569: &invalid_request($r,24);
570: return OK;
571: }
572:
573: #
574: # If no LON-CAPA course available, check if domain's configuration
575: # for the specific LTI Consumer allows a new course to be created
576: # (requires role in Consumer to be: Instructor and Instructor to map to CC)
577: #
578:
579: my $reqcrs;
580: if ($cnum eq '') {
581: if ($lti{$itemid}{'crsinc'}) {
582: if ((@ltiroles) && ($lti{$itemid}{'mapcrs'}) &&
583: ($ltiroles[0] eq 'Instructor') && ($lcroles[0] eq 'cc') && ($lti{$itemid}{'makecrs'})) {
584: my (%can_request,%request_domains);
585: &Apache::lonnet::check_can_request($cdom,\%can_request,\%request_domains,$uname,$udom);
586: if ($can_request{'lti'}) {
587: $reqcrs = 1;
588: <i_session($r,$itemid,$uname,$udom,$uhome,$lonhost,undef,$mapurl,$tail,
589: $symb,$cdom,$cnum,$params,\@ltiroles,$lti{$itemid},\@lcroles,
590: $reqcrs,$sourcecrs);
591: } else {
592: &invalid_request($r,25);
593: }
594: } else {
595: &invalid_request($r,26);
596: }
597: } else {
598: <i_session($r,$itemid,$uname,$udom,$uhome,$lonhost,undef,$mapurl,$tail,
599: $symb,$cdom,$cnum,$params,\@ltiroles,$lti{$itemid},\@lcroles,
600: $reqcrs,$sourcecrs);
601: }
602: return OK;
603: }
604:
605: #
606: # If LON-CAPA course is a Community, and LON-CAPA role
607: # indicated is cc, change role indicated to co.
608: #
609:
610: my %crsenv;
611: if ($lcroles[0] eq 'cc') {
612: if (($cdom ne '') && ($cnum ne '')) {
613: %crsenv = &Apache::lonnet::coursedescription($cdom.'_'.$cnum,{ 'one_time' => 1,});
614: if ($crsenv{'type'} eq 'Community') {
615: $lcroles[0] = 'co';
616: }
617: }
618: }
619:
620: #
621: # Determine if user has a LON-CAPA role in the mapped LON-CAPA course.
622: # If multiple LON-CAPA roles are available for the user's assigned LTI roles,
623: # choose the first available LON-CAPA role in the order: cc/co, in, ta, ep, st
624: #
625:
626: my ($role,$usec,$withsec);
627: unless ((($lcroles[0] eq 'cc') || ($lcroles[0] eq 'co')) && (@lcroles == 1)) {
628: if ($lti{$itemid}{'section'} ne '') {
629: if ($lti{$itemid}{'section'} eq 'course_section_sourcedid') {
630: if ($env{'form.course_section_sourcedid'} !~ /\W/) {
631: $usec = $env{'form.course_section_sourcedid'};
632: }
633: } elsif ($env{'form.'.$lti{$itemid}{'section'}} !~ /\W/) {
634: $usec = $env{'form.'.$lti{$itemid}{'section'}};
635: }
636: }
637: if ($usec ne '') {
638: $withsec = 1;
639: }
640: }
641:
642: if (@lcroles) {
643: my %crsroles = &Apache::lonnet::get_my_roles($uname,$udom,'userroles',undef,\@lcroles,
644: [$cdom],$withsec);
645: foreach my $reqrole (@lcroles) {
646: if ($withsec) {
647: my $incsec;
648: if (($reqrole eq 'cc') || ($reqrole eq 'co')) {
649: $incsec = '';
650: } else {
651: $incsec = $usec;
652: }
653: if (exists($crsroles{$cnum.':'.$cdom.':'.$reqrole.':'.$incsec})) {
654: $role = $reqrole.'./'.$cdom.'/'.$cnum;
655: if ($incsec ne '') {
656: $role .= '/'.$usec;
657: }
658: last;
659: }
660: } else {
661: if (exists($crsroles{$cnum.':'.$cdom.':'.$reqrole})) {
662: $role = $reqrole.'./'.$cdom.'/'.$cnum;
663: last;
664: }
665: }
666: }
667: }
668:
669: #
670: # Determine if user can selfenroll
671: #
672:
673: my ($reqrole,$selfenrollrole);
674: if ($role eq '') {
675: if ((@ltiroles) && (ref($lti{$itemid}{'selfenroll'}) eq 'ARRAY')) {
676: foreach my $ltirole (@ltiroles) {
677: if (grep(/^\Q$ltirole\E$/,@{$lti{$itemid}{'selfenroll'}})) {
678: if (ref($lti{$itemid}{maproles}) eq 'HASH') {
679: $reqrole = $lti{$itemid}{maproles}{$ltirole};
680: last;
681: }
682: }
683: }
684: }
685: if ($reqrole eq '') {
686: &invalid_request($r,27);
687: return OK;
688: } else {
689: unless (%crsenv) {
690: %crsenv = &Apache::lonnet::coursedescription($cdom.'_'.$cnum);
691: }
692: my $default_enrollment_start_date = $crsenv{'default_enrollment_start_date'};
693: my $default_enrollment_end_date = $crsenv{'default_enrollment_end_date'};
694: my $now = time;
695: if ($default_enrollment_end_date && $default_enrollment_end_date <= $now) {
696: &invalid_request($r,28);
697: return OK;
698: } elsif ($default_enrollment_start_date && $default_enrollment_start_date >$now) {
699: &invalid_request($r,29);
700: return OK;
701: } else {
702: $selfenrollrole = $reqrole.'./'.$cdom.'/'.$cnum;
703: if (($withsec) && ($reqrole ne 'cc') && ($reqrole ne 'co')) {
704: if ($usec ne '') {
705: $selfenrollrole .= '/'.$usec;
706: }
707: }
708: }
709: }
710: }
711:
712: #
713: # Retrieve course type of LON-CAPA course to check if mapping from a Consumer
714: # course identifier permitted for this type of course (one of: official,
715: # unofficial, community, textbook, placement or lti.
716: #
717:
718: unless (%crsenv) {
719: %crsenv = &Apache::lonnet::coursedescription($cdom.'_'.$cnum);
720: }
721: my $crstype = lc($crsenv{'type'});
722: if ($crstype eq '') {
723: $crstype = 'course';
724: }
725: if ($crstype eq 'course') {
726: if ($crsenv{'internal.coursecode'}) {
727: $crstype = 'official';
728: } elsif ($crsenv{'internal.textbook'}) {
729: $crstype = 'textbook';
730: } elsif ($crsenv{'internal.lti'}) {
731: $crstype = 'lti';
732: } else {
733: $crstype = 'unofficial';
734: }
735: }
736:
737: #
738: # Store consumer-to-LON-CAPA course mapping if permitted
739: #
740:
741: if (($lti{$itemid}{'storecrs'}) && ($sourcecrs ne '') &&
742: ($consumers{$sourcecrs} eq '') && ($cnum ne '')) {
743: if (ref($lti{$itemid}{'mapcrstype'}) eq 'ARRAY') {
744: if (grep(/^$crstype$/,@{$lti{$itemid}{'mapcrstype'}})) {
745: &Apache::lonnet::put_dom('lticonsumers',{ $sourcecrs => $itemid.':'.$cnum },$cdom);
746: }
747: }
748: }
749:
750: #
751: # Start user session
752: #
753:
754: <i_session($r,$itemid,$uname,$udom,$uhome,$lonhost,$role,$mapurl,$tail,$symb,
755: $cdom,$cnum,$params,\@ltiroles,$lti{$itemid},\@lcroles,undef,$sourcecrs,
756: $selfenrollrole);
757: return OK;
758: }
759:
760: sub get_lti_itemid {
761: my ($requri,$hostname,$params,$cdom,$cnum,$context) = @_;
762: return unless (ref($params) eq 'HASH');
763: my $protocol = 'http';
764: if ($ENV{'SERVER_PORT'} == 443) {
765: $protocol = 'https';
766: }
767: my $url = $protocol.'://'.$hostname.$requri;
768: my $method = $env{'request.method'};
769: if ($cnum ne '') {
770: return &Apache::lonnet::courselti_itemid($cnum,$cdom,$url,$method,$params,$context);
771: } else {
772: return &Apache::lonnet::domainlti_itemid($cdom,$url,$method,$params,$context);
773: }
774: }
775:
776: sub lti_enroll {
777: my ($uname,$udom,$selfenrollrole) = @_;
778: my $enrollresult;
779: my ($role,$cdom,$cnum,$sec) =
780: ($selfenrollrole =~ m{^(\w+)\./($match_domain)/($match_courseid)(?:|/(\w*))$});
781: if (($cnum ne '') && ($cdom ne '')) {
782: my $chome = &Apache::lonnet::homeserver($cnum,$cdom);
783: if ($chome ne 'no_host') {
784: my %coursehash = &Apache::lonnet::coursedescription($cdom.'_'.$cnum);
785: my $start = $coursehash{'default_enrollment_start_date'};
786: my $end = $coursehash{'default_enrollment_end_date'};
787: $enrollresult = &LONCAPA::ltiutils::enrolluser($udom,$uname,$role,$cdom,$cnum,$sec,
788: $start,$end,1);
789: }
790: }
791: return $enrollresult;
792: }
793:
794: sub lti_reqcrs {
795: my ($r,$cdom,$form,$uname,$udom) = @_;
796: my (%can_request,%request_domains);
797: &Apache::lonnet::check_can_request($cdom,\%can_request,\%request_domains,$uname,$udom);
798: if ($can_request{'lti'}) {
799: my %domconfig = &Apache::lonnet::get_dom('configuration',['requestcourses'],$cdom);
800: my %domdefs = &Apache::lonnet::get_domain_defaults($cdom);
801: &Apache::lonrequestcourse::print_textbook_form($r,$cdom,[$cdom],\%domdefs,
802: $domconfig{'requestcourses'},
803: \%can_request,'lti',$form);
804: } else {
805: $r->print(
806: &Apache::loncommon::start_page('Invalid LTI call',undef,{'only_body' => 1}).
807: &mt('Invalid LTI call').
808: &Apache::loncommon::end_page()
809: );
810: }
811: }
812:
813: sub lti_session {
814: my ($r,$itemid,$uname,$udom,$uhome,$lonhost,$role,$mapurl,$tail,$symb,$cdom,$cnum,
815: $params,$ltiroles,$ltihash,$lcroles,$reqcrs,$sourcecrs,$selfenrollrole) = @_;
816: return unless ((ref($params) eq 'HASH') && (ref($ltiroles) eq 'ARRAY') &&
817: (ref($ltihash) eq 'HASH') && (ref($lcroles) eq 'ARRAY'));
818: #
819: # Check if user should be hosted here or switched to another server.
820: #
821: $r->user($uname);
822: if ($cnum) {
823: if ($role) {
824: &Apache::lonnet::logthis(" LTI authorized user ($itemid): $uname:$udom, role: $role, course: $cdom\_$cnum");
825: } elsif ($selfenrollrole =~ m{^(\w+)\./$cdom/$cnum}) {
826: &Apache::lonnet::logthis(" LTI authorized user ($itemid): $uname:$udom, desired role: $1 course: $cdom\_$cnum");
827: }
828: } else {
829: &Apache::lonnet::logthis(" LTI authorized user ($itemid): $uname:$udom, course dom: $cdom");
830: }
831: my ($is_balancer,$otherserver,$hosthere);
832: ($is_balancer,$otherserver) =
833: &Apache::lonnet::check_loadbalancing($uname,$udom,'login');
834: if ($is_balancer) {
835: if ($otherserver eq '') {
836: my $lowest_load;
837: ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($udom);
838: if ($lowest_load > 100) {
839: $otherserver = &Apache::lonnet::spareserver($r,$lowest_load,$lowest_load,1,$udom);
840: }
841: }
842: if ($otherserver ne '') {
843: my @hosts = &Apache::lonnet::current_machine_ids();
844: if (grep(/^\Q$otherserver\E$/,@hosts)) {
845: $hosthere = $otherserver;
846: }
847: }
848: }
849: my $protocol = 'http';
850: if ($ENV{'SERVER_PORT'} == 443) {
851: $protocol = 'https';
852: }
853: if (($is_balancer) && (!$hosthere)) {
854: # login but immediately go to switch server.
855: &Apache::lonauth::success($r,$uname,$udom,$uhome,'noredirect');
856: if (($ltihash->{'callback'}) && ($params->{$ltihash->{'callback'}})) {
857: &LONCAPA::ltiutils::setup_logout_callback($uname,$udom,$otherserver,
858: $ltihash->{'key'},
859: $ltihash->{'secret'},
860: $params->{$ltihash->{'callback'}},
861: $r->dir_config('ltiIDsDir'),
862: $protocol,$r->hostname);
863: }
864: if ($symb) {
865: $env{'form.symb'} = $symb;
866: $env{'request.lti.uri'} = $tail;
867: } else {
868: if ($mapurl) {
869: $env{'form.origurl'} = $mapurl;
870: $env{'request.lti.uri'} = $mapurl;
871: } elsif ($tail =~ m{^\Q/tiny/$cdom/\E\w+$}) {
872: $env{'form.origurl'} = $tail;
873: $env{'request.lti.uri'} = $tail;
874: } elsif ($tail eq "/$cdom/$cnum") {
875: $env{'form.origurl'} = '/adm/navmaps';
876: $env{'request.lti.uri'} = $tail;
877: } else {
878: unless ($tail eq '/adm/roles') {
879: if ($cnum) {
880: $env{'form.origurl'} = '/adm/navmaps';
881: }
882: }
883: }
884: }
885: if ($role) {
886: $env{'form.role'} = $role;
887: }
888: if (($lcroles->[0] eq 'cc') && ($reqcrs)) {
889: $env{'request.lti.reqcrs'} = 1;
890: $env{'request.lti.reqrole'} = 'cc';
891: $env{'request.lti.sourcecrs'} = $sourcecrs;
892: }
893: if ($selfenrollrole) {
894: $env{'request.lti.selfenrollrole'} = $selfenrollrole;
895: $env{'request.lti.sourcecrs'} = $sourcecrs;
896: }
897: if ($ltihash->{'passback'}) {
898: if ($params->{'lis_result_sourcedid'}) {
899: $env{'request.lti.passbackid'} = $params->{'lis_result_sourcedid'};
900: }
901: if ($params->{'lis_outcome_service_url'}) {
902: $env{'request.lti.passbackurl'} = $params->{'lis_outcome_service_url'};
903: }
904: }
905: if (($ltihash->{'roster'}) && (grep(/^Instructor$/,@{$ltiroles}))) {
906: if ($params->{'ext_ims_lis_memberships_id'}) {
907: $env{'request.lti.rosterid'} = $params->{'ext_ims_lis_memberships_id'};
908: }
909: if ($params->{'ext_ims_lis_memberships_url'}) {
910: $env{'request.lti.rosterurl'} = $params->{'ext_ims_lis_memberships_url'};
911: }
912: }
913: $env{'request.lti.login'} = $itemid;
914: if ($params->{'launch_presentation_document_target'}) {
915: $env{'request.lti.target'} = $params->{'launch_presentation_document_target'};
916: }
917: foreach my $key (keys(%{$params})) {
918: delete($env{'form.'.$key});
919: }
920: my $redirecturl = '/adm/switchserver';
921: if ($otherserver ne '') {
922: $redirecturl .= '?otherserver='.$otherserver;
923: }
924: $r->internal_redirect($redirecturl);
925: $r->set_handlers('PerlHandler'=> undef);
926: } else {
927: # need to login them in, so generate the need data that
928: # migrate expects to do login
929: foreach my $key (keys(%{$params})) {
930: delete($env{'form.'.$key});
931: }
932: if (($ltihash->{'callback'}) && ($params->{$ltihash->{'callback'}})) {
933: &LONCAPA::ltiutils::setup_logout_callback($uname,$udom,$lonhost,
934: $ltihash->{'key'},
935: $ltihash->{'secret'},
936: $params->{$ltihash->{'callback'}},
937: $r->dir_config('ltiIDsDir'),
938: $protocol,$r->hostname);
939: }
940: my $ip = $r->get_remote_host();
941: my %info=('ip' => $ip,
942: 'domain' => $udom,
943: 'username' => $uname,
944: 'server' => $lonhost,
945: 'lti.login' => $itemid,
946: 'lti.uri' => $tail,
947: );
948: if ($role) {
949: $info{'role'} = $role;
950: }
951: if ($symb) {
952: $info{'symb'} = $symb;
953: }
954: if (($lcroles->[0] eq 'cc') && ($reqcrs)) {
955: $info{'lti.reqcrs'} = 1;
956: $info{'lti.reqrole'} = 'cc';
957: $info{'lti.sourcecrs'} = $sourcecrs;
958: }
959: if ($selfenrollrole) {
960: $info{'lti.selfenrollrole'} = $selfenrollrole;
961: }
962: if ($ltihash->{'passback'}) {
963: if ($params->{'lis_result_sourcedid'}) {
964: $info{'lti.passbackid'} = $params->{'lis_result_sourcedid'}
965: }
966: if ($params->{'lis_outcome_service_url'}) {
967: $info{'lti.passbackurl'} = $params->{'lis_outcome_service_url'}
968: }
969: }
970: if (($ltihash->{'roster'}) && (grep(/^Instructor$/,@{$ltiroles}))) {
971: if ($params->{'ext_ims_lis_memberships_id'}) {
972: $info{'lti.rosterid'} = $params->{'ext_ims_lis_memberships_id'};
973: }
974: if ($params->{'ext_ims_lis_memberships_url'}) {
975: $info{'lti.rosterurl'} = $params->{'ext_ims_lis_memberships_url'};
976: }
977: }
978: if ($params->{'launch_presentation_document_target'}) {
979: $info{'lti.target'} = $params->{'launch_presentation_document_target'};
980: }
981:
982: unless ($info{'symb'}) {
983: if ($mapurl) {
984: $info{'origurl'} = $mapurl;
985: } elsif ($tail =~ m{^\Q/tiny/$cdom/\E\w+$}) {
986: $info{'origurl'} = $tail;
987: } else {
988: unless ($tail eq '/adm/roles') {
989: if ($cnum) {
990: $info{'origurl'} = '/adm/navmaps';
991: }
992: }
993: }
994: }
995: if (($is_balancer) && ($hosthere)) {
996: $info{'noloadbalance'} = $hosthere;
997: }
998: my $token = &Apache::lonnet::tmpput(\%info,$lonhost);
999: $env{'form.token'} = $token;
1000: $r->internal_redirect('/adm/migrateuser');
1001: $r->set_handlers('PerlHandler'=> undef);
1002: }
1003: return;
1004: }
1005:
1006: sub invalid_request {
1007: my ($r,$num) = @_;
1008: &Apache::loncommon::content_type($r,'text/html');
1009: $r->send_http_header;
1010: if ($r->header_only) {
1011: return;
1012: }
1013: &Apache::lonlocal::get_language_handle($r);
1014: $r->print(
1015: &Apache::loncommon::start_page('Invalid LTI call','',{ 'only_body' => 1,}).
1016: &mt('Invalid LTI call [_1]',$num).
1017: &Apache::loncommon::end_page());
1018: return;
1019: }
1020:
1021: sub course_from_tinyurl {
1022: my ($tail) = @_;
1023: my ($urlcdom,$urlcnum);
1024: if ($tail =~ m{^/tiny/($match_domain)/(\w+)$}) {
1025: ($urlcdom,my $key) = ($1,$2);
1026: my $tinyurl;
1027: my ($result,$cached)=&Apache::lonnet::is_cached_new('tiny',$urlcdom."\0".$key);
1028: if (defined($cached)) {
1029: $tinyurl = $result;
1030: } else {
1031: my $configuname = &Apache::lonnet::get_domainconfiguser($urlcdom);
1032: my %currtiny = &Apache::lonnet::get('tiny',[$key],$urlcdom,$configuname);
1033: if ($currtiny{$key} ne '') {
1034: $tinyurl = $currtiny{$key};
1035: &Apache::lonnet::do_cache_new('tiny',$urlcdom."\0".$key,$currtiny{$key},600);
1036: }
1037: }
1038: if ($tinyurl ne '') {
1039: $urlcnum = (split(/\&/,$tinyurl))[0];
1040: }
1041: }
1042: return ($urlcdom,$urlcnum);
1043: }
1044:
1045: 1;
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