1: # The LearningOnline Network with CAPA
2: # LTI Consumer Module to receive grades passed back by Provider
3: #
4: # $Id: ltipassback.pm,v 1.8 2023/06/02 00:28:03 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::ltipassback;
30:
31: use strict;
32: use URI::Escape;
33: use Apache::Constants qw(:common :http);
34: use Apache::lonnet;
35: use Apache::loncommon;
36: use Apache::lonacc;
37: use LONCAPA::ltiutils;
38:
39: sub handler {
40: my $r = shift;
41: my %errors;
42: my $params = {};
43: my ($oauthtype,$authheader,$xmlbody);
44: #
45: # Retrieve content type from headers
46: #
47: my $content_type = $r->headers_in->get('Content-Type');
48: if ($content_type eq 'application/xml') {
49: $oauthtype = 'consumer';
50: #
51: # Retrieve OAuth data from Authorization header sent by LTI Provider
52: #
53: $authheader = $r->headers_in->get('Authorization');
54: my ($authtype,$valuestr) = ($authheader =~ /^(OAuth)\s+(.+)$/i);
55: if (lc($authtype) eq 'oauth') {
56: foreach my $pair (split(/\s*,\s*/,$valuestr)) {
57: my ($key,$value) = split(/=/,$pair);
58: $value =~ s /(^"|"$)//g;
59: $params->{$key} = URI::Escape::uri_unescape($value);
60: }
61: }
62: #
63: # Retrieve message body
64: #
65: my $length = $r->headers_in->get('Content-length');
66: if ($length) {
67: $r->read($xmlbody,$length,0);
68: if ($xmlbody ne '') {
69: my %grades = &LONCAPA::ltiutils::parse_grade_xml($xmlbody);
70: foreach my $num (sort { $a <=> $b } (keys(%grades))) {
71: if (ref($grades{$num}) eq 'HASH') {
72: if (($grades{$num}{'sourcedid'} ne '') && ($grades{$num}{'score'} ne '')) {
73: $params->{'sourcedid'} = $grades{$num}{'sourcedid'};
74: $params->{'result_resultscore_textstring'} = $grades{$num}{'score'};
75: $params->{'result_resultscore_language'} = $grades{$num}{'language'};
76: $params->{'result_resultvaluesourcedid'} = 'decimal';
77: }
78: }
79: }
80: }
81: }
82: } else {
83: $oauthtype = 'request token';
84: #
85: # Retrieve data POSTed by LTI Provider
86: #
87: &Apache::lonacc::get_posted_cgi($r);
88: foreach my $key (sort(keys(%env))) {
89: if ($key =~ /^form\.(.+)$/) {
90: $params->{$1} = $env{$key};
91: }
92: }
93: }
94:
95: unless (keys(%{$params})) {
96: $errors{1} = 1;
97: &invalid_request($r,$params,\%errors);
98: return OK;
99: }
100:
101: unless ($params->{'oauth_consumer_key'} &&
102: $params->{'oauth_nonce'} &&
103: $params->{'oauth_timestamp'} &&
104: $params->{'oauth_version'} &&
105: $params->{'oauth_signature'} &&
106: $params->{'oauth_signature_method'}) {
107: $errors{2} = 1;
108: &invalid_request($r,$params,\%errors);
109: return OK;
110: }
111:
112: #
113: # Retrieve the signature, digested symb, digested user, and LON-CAPA
114: # courseID from the sourcedid in the POSTed data
115: #
116: unless ($params->{'sourcedid'}) {
117: $errors{3} = 1;
118: &invalid_request($r,$params,\%errors);
119: return OK;
120: }
121:
122: my ($resultsig,$digsymb,$diguser,$cid) = split(/\Q:::\E/,$params->{'sourcedid'});
123: unless ($resultsig && $digsymb && $diguser && $cid) {
124: $errors{4} = 1;
125: &invalid_request($r,$params,\%errors);
126: return OK;
127: }
128:
129: my ($cdom,$cnum,$marker,$symb,$uname,$udom);
130:
131: #
132: # Determine the domain and the courseID of the LON-CAPA course to which the
133: # launch of LON-CAPA should provide access.
134: #
135: ($cdom,$cnum) = &LONCAPA::ltiutils::get_loncapa_course($r->dir_config('lonHostID'),
136: $cid,\%errors);
137: unless ($cdom && $cnum) {
138: &invalid_request($r,$params,\%errors);
139: return OK;
140: }
141:
142: #
143: # Use the digested symb to lookup the real symb in exttools.db
144: #
145:
146: ($marker,$symb,$uname,$udom) =
147: &LONCAPA::ltiutils::get_tool_instance($cdom,$cnum,$digsymb,$diguser,\%errors);
148:
149: unless ($marker) {
150: &invalid_request($r,$params,\%errors);
151: return OK;
152: }
153:
154: #
155: # Retrieve the Consumer key and Consumer secret from the domain configuration
156: # for the Tool Provider ID stored in the exttool_$marker.db
157: #
158:
159: my (%toolsettings,%ltitools);
160: my ($consumer_secret,$nonce_lifetime) =
161: &LONCAPA::ltiutils::get_tool_secret($params->{'oauth_consumer_key'},
162: $marker,$symb,$cdom,$cnum,
163: \%toolsettings,\%ltitools,\%errors);
164:
165: if (keys(%errors) > 0) {
166: &invalid_request($r,$params,\%errors);
167: return OK;
168: }
169:
170: #
171: # Verify the signed request using the consumer_key and
172: # secret for the specific LTI Provider.
173: #
174:
175: my $protocol = 'http';
176: if ($ENV{'SERVER_PORT'} == 443) {
177: $protocol = 'https';
178: }
179:
180: unless (LONCAPA::ltiutils::verify_request($oauthtype,$protocol,$r->hostname,$r->uri,
181: $r->method,$consumer_secret,$params,
182: $authheader,\%errors)) {
183: &invalid_request($r,$params,\%errors);
184: return OK;
185: }
186:
187: #
188: # Verify XML in request body has not been tampered with
189: #
190:
191: if ($content_type eq 'application/xml') {
192: my $bodyhash = Digest::SHA::sha1_base64($xmlbody);
193: while (length($bodyhash) % 4) {
194: $bodyhash .= '=';
195: }
196: unless ($bodyhash eq $params->{oauth_body_hash}) {
197: $errors{16} = 1;
198: &invalid_request($r,$params,\%errors);
199: return OK;
200: }
201: }
202:
203: #
204: # Determine if nonce in POSTed data has expired.
205: # If unexpired, confirm it has not already been used.
206: #
207:
208: unless (&LONCAPA::ltiutils::check_nonce($params->{'oauth_nonce'},$params->{'oauth_timestamp'},
209: $ltitools{'lifetime'},$cdom,$r->dir_config('lonLTIDir'))) {
210: $errors{17} = 1;
211: &invalid_request($r,$params,\%errors);
212: return OK;
213: }
214:
215: #
216: # Verify that the sourcedid has not been tampered with,
217: # and the gradesecret used to create it is still valid.
218: #
219:
220: unless (&LONCAPA::ltiutils::verify_lis_item($resultsig,'grade',$digsymb,$diguser,$cdom,
221: $cnum,\%toolsettings,\%ltitools,\%errors)) {
222: &invalid_request($r,$params,\%errors);
223: return OK;
224: }
225:
226: #
227: # Does the user have an active role in the course which maps to one of
228: # the supported LTI roles
229: #
230:
231: if (($uname ne '') && ($udom ne '')) {
232: my %maproles;
233: if (ref($ltitools{'roles'}) eq 'HASH') {
234: %maproles = %{$ltitools{'roles'}};
235: }
236: unless (keys(%maproles)) {
237: $errors{22} = 1;
238: &invalid_request($r,$params,\%errors);
239: return OK;
240: }
241: my ($crstype,$hasrole);
242: my @allroles = &Apache::lonuserutils::roles_by_context('course',0,$crstype);
243: my (%availableroles,$coursepersonnel,$includestudents,%users);
244: foreach my $role (@allroles) {
245: if (exists($maproles{$role})) {
246: $availableroles{$role} = 1;
247: if ($role eq 'st') {
248: $includestudents = 1;
249: } else {
250: $coursepersonnel = 1;
251: }
252: }
253: }
254: if (keys(%availableroles)) {
255: my $courseurl = "/$cdom/$cnum";
256: my %roleshash = &Apache::lonnet::dump('roles',$udom,$uname,$courseurl);
257: if (keys(%roleshash)) {
258: my $now = time;
259: foreach my $key (keys(%roleshash)) {
260: if ($key =~ m{^\Q$courseurl\E(|/\w+)_(\w+)$}) {
261: my ($secgroup,$rolecode) = ($1,$2);
262: next if ($rolecode eq 'gr');
263: next unless ($availableroles{$rolecode});
264: my ($dummy,$end,$start)=split(/\_/,$roleshash{$key});
265: next if (defined($end) && $end && ($now > $end));
266: next if (defined($start) && $start && ($now < $start));
267: $hasrole = 1;
268: last;
269: }
270: }
271: }
272: }
273: unless ($hasrole) {
274: $errors{23} = 1;
275: &invalid_request($r,$params,\%errors);
276: return OK;
277: }
278: } else {
279: $errors{24} = 1;
280: &invalid_request($r,$params,\%errors);
281: return OK;
282: }
283:
284: #
285: # Store result if one was sent in a valid format.
286: #
287:
288: my ($result,$resulttype,$lang,$pcf);
289: if (exists($params->{'result_resultvaluesourcedid'})) {
290: $resulttype = $params->{'result_resultvaluesourcedid'};
291: $resulttype =~ s/(^\s+|\s+)$//g;
292: } else {
293: $resulttype = 'decimal';
294: }
295: $result = $params->{'result_resultscore_textstring'};
296: $result =~ s/(^\s+|\s+)$//g;
297: my $posslang = $params->{'result_resultscore_language'};
298: $posslang =~ s/(^\s+|\s+)$//g;
299: if ($posslang =~ /^\w+(|\-\w+(|\-w+))$/) {
300: $lang = $posslang;
301: }
302: if (($resulttype eq 'ratio') || ($resulttype eq 'decimal') || ($resulttype eq 'percentage')) {
303: if ($resulttype eq 'ratio') {
304: my ($numerator,$denominator) = split(/\s*\/\s*/,$result,2);
305: $numerator =~ s/(^\s+|\s+)$//g;
306: $denominator =~ s/(^\s+|\s+)$//g;
307: if (($numerator =~ /^\d+$/) && ($denominator =~ /^\d+$/) && ($denominator !=0)) {
308: eval {
309: $pcf = $numerator/$denominator;
310: };
311: }
312: if ($@) {
313: $errors{24} = 1;
314: &invalid_request($r,$params,\%errors);
315: return OK;
316: }
317: } elsif ($resulttype eq 'decimal') {
318: if (($result ne '') && ($result =~ /^\d*\.?\d*$/)) {
319: if ($result eq '.') {
320: $result = 0;
321: }
322: if (($result >= 0) && ($result <= 1)) {
323: $pcf = $result;
324: }
325: }
326: } elsif ($resulttype eq 'percentage') {
327: if ($result =~ /^(\d+)\s*\%?$/) {
328: my $percent = $1;
329: if (($percent >= 0) && ($percent <= 100)) {
330: $pcf = $percent/100.0;
331: }
332: }
333: }
334: if ($pcf ne '') {
335: my %newrecord=();
336: my $reckey = 'resource.0.solved';
337: my %record = &Apache::lonnet::restore($symb,$cdom.'_'.$cnum,$udom,$uname);
338: my $tries = 0;
339: if ($record{'resource.0.tries'} =~ /^\d$/) {
340: $tries = $record{'resource.0.tries'};
341: }
342: if ($record{'resource.0.awarded'} ne $pcf) {
343: $newrecord{'resource.0.awarded'} = $pcf;
344: }
345: if ($pcf == 0) {
346: if ($record{$reckey} ne 'incorrect_by_passback') {
347: $newrecord{$reckey} = 'incorrect_by_passback';
348: }
349: } else {
350: if ($record{$reckey} ne 'correct_by_passback') {
351: $newrecord{$reckey} = 'correct_by_passback';
352: }
353: }
354: if (%newrecord) {
355: $newrecord{'resource.0.tries'} = 1 + $tries;
356: $env{'request.course.id'} = $cdom.'_'.$cnum;
357: my $result = &Apache::lonnet::cstore(\%newrecord,$symb,$cdom.'_'.$cnum,
358: $udom,$uname);
359: delete($env{'request.course.id'});
360: if (($result eq 'ok') || ($result eq 'con_delayed')) {
361: &success($r,$params->{'sourcedid'},$resulttype,$result,$lang);
362: } else {
363: $errors{25} = 1;
364: &invalid_request($r,$params,\%errors);
365: }
366: } else {
367: &success($r,$params->{'sourcedid'},$resulttype,$result,$lang);
368: }
369: } else {
370: $errors{26} = 1;
371: &invalid_request($r,$params,\%errors);
372: }
373: } else {
374: $errors{27} = 1;
375: &invalid_request($r,$params,\%errors);
376: }
377: return OK;
378: }
379:
380: sub success {
381: my ($r,$sourcedid,$scoretype,$score,$lang) = @_;
382: my $date = &Apache::loncommon::utc_string(time);
383: &Apache::loncommon::content_type($r,'text/xml');
384: $r->send_http_header;
385: if ($r->header_only) {
386: return;
387: }
388: $r->print(<<"END");
389: <?xml version="1.0" encoding="UTF-8" ?>
390: <message_response>
391: <lti_message_type>basic-lis-updateresult</lti_message_type>
392: <statusinfo>
393: <codemajor>Success</codemajor>
394: <severity>Status</severity>
395: <codeminor>fullsuccess</codeminor>
396: <description>Grade updated</description>
397: </statusinfo>
398: <result>
399: <sourcedid>$sourcedid</sourcedid>
400: <date>$date</date>
401: <resultscore>
402: <resultvaluesourcedid>$scoretype</resultvaluesourcedid>
403: <textstring>$score</textstring>
404: <language>$lang</language>
405: </resultscore>
406: </result>
407: </message_response>
408: END
409: return;
410: }
411:
412: sub invalid_request {
413: my ($r,$params,$errors) = @_;
414: my $date = &Apache::loncommon::utc_string(time);
415: my ($scoretype,$score,$lang);
416: if (ref($params) eq 'HASH') {
417: if ($params->{'result_resultvaluesourcedid'} =~ /^\s*(decimal|percentage|ratio)\s*$/) {
418: $scoretype = $1;
419: }
420: if ($scoretype eq 'decimal') {
421: if ($params->{'result_resultscore_textstring'} =~ /^\s*(\d*\.?\d*)\s*$/) {
422: $score = $1;
423: }
424: } elsif ($scoretype eq 'ratio') {
425: if ($params->{'result_resultscore_textstring'} =~ m{^\s*(\d+)\s*/\s*(\d+)\s*$}) {
426: $score = $1.'/'.$2;
427: }
428: } elsif ($scoretype eq 'percentage') {
429: if ($params->{'result_resultscore_textstring'} =~ /^\s*(\d+)\s*(\%?)\s*$/) {
430: $score = $1.$2;
431: }
432: }
433: my $posslang = $params->{'result_resultscore_language'};
434: $posslang =~ s/(^\s+|\s+)$//g;
435: if ($posslang =~ /^\w+(|\-\w+(|\-w+))$/) {
436: $lang = $posslang;
437: }
438: }
439: my $errormsg;
440: if (ref($errors) eq 'HASH') {
441: $errormsg = join(',',keys(%{$errors}));
442: }
443: &Apache::loncommon::content_type($r,'text/xml');
444: $r->send_http_header;
445: if ($r->header_only) {
446: return;
447: }
448: $r->print(<<"END");
449: <message_response>
450: <lti_message_type>basic-lis-updateresult</lti_message_type>
451: <statusinfo>
452: <codemajor>Failure</codemajor>
453: <severity>Error</severity>
454: <codeminor>$errormsg</codeminor>
455: </statusinfo>
456: <result>
457: <sourcedid>$params->{'sourcedid'}</sourcedid>
458: <statusofresult>interim</statusofresult>
459: <date>$date</date>
460: <resultscore>
461: <resultvaluesourcedid>$scoretype</resultvaluesourcedid>
462: <textstring>$score</textstring>
463: <language>$lang</language>
464: </resultscore>
465: </result>
466: </message_response>
467: END
468: return;
469: }
470:
471: 1;
472:
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