1: # The LearningOnline Network with CAPA
2: # Launch External Tool Provider (LTI)
3: #
4: # $Id: lonexttool.pm,v 1.20.2.1 2020/04/09 21:11:36 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: =pod
30:
31: =head1 NAME
32:
33: Apache::lonexttool - Tool Provider launcher
34:
35: =head1 SYNOPSIS
36:
37:
38: =head1 OVERVIEW
39:
40: =cut
41:
42: package Apache::lonexttool;
43:
44: use strict;
45: use Apache::Constants qw(:common :http);
46: use Encode;
47: use Digest::SHA;
48: use HTML::Entities;
49: use Apache::lonlocal;
50: use Apache::lonnet;
51: use Apache::loncommon;
52: use LONCAPA::ltiutils;
53:
54: sub handler {
55: my $r=shift;
56: &Apache::loncommon::content_type($r,'text/html');
57: $r->send_http_header;
58:
59: return OK if $r->header_only;
60:
61: my $target=$env{'form.grade_target'};
62: # ------------------------------------------------------------ Print the screen
63: if ($target eq 'tex') {
64: $r->print(&Apache::lonprintout::print_latex_header($env{'form.latex_type'}));
65: } else {
66: $target = 'web';
67: }
68:
69: # Is this even in a course?
70: unless ($env{'request.course.id'}) {
71: if ($target ne 'tex') {
72: &Apache::loncommon::simple_error_page($r,'','Not in a course',
73: {'only_body' => 1});
74: } else {
75: $r->print('\textbf{Not in a course}\end{document}');
76: }
77: return OK;
78: }
79:
80: my ($marker,$exttool) = (split(m{/},$r->uri))[4,5];
81: $marker=~s/\D//g;
82:
83: if (!$marker) {
84: if ($target ne 'tex') {
85: $r->print(&mt('Invalid Call'));
86: } else {
87: $r->print('\textbf{'&mt('Invalid Call').'}\end{document}');
88: }
89: return OK;
90: }
91:
92: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
93: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
94: my $chome = $env{'course.'.$env{'request.course.id'}.'.home'};
95: my ($idx,$is_tool,%toolhash,%toolsettings);
96:
97: if ($r->uri eq "/adm/$cdom/$cnum/$marker/$exttool") {
98: %toolsettings=&Apache::lonnet::dump('exttool_'.$marker,$cdom,$cnum);
99: if ($toolsettings{'id'}) {
100: $idx = $toolsettings{'id'};
101: my %ltitools = &Apache::lonnet::get_domain_lti($cdom,'consumer');
102: if (ref($ltitools{$idx}) eq 'HASH') {
103: %toolhash = %{$ltitools{$idx}};
104: $toolhash{'display'} = {
105: target => $toolsettings{'target'},
106: width => $toolsettings{'width'},
107: height => $toolsettings{'height'},
108: };
109: foreach my $item (qw(crslabel crstitle crsappend)) {
110: $toolhash{$item} = $toolsettings{$item};
111: }
112: $is_tool = 1;
113: }
114: }
115: }
116: unless ($is_tool) {
117: if ($target ne 'tex') {
118: $r->print('<div>'.&mt('Invalid Call').'</div>');
119: } else {
120: $r->print('\textbf{'.&mt(Invalid Call).'}\end{document}');
121: }
122: return OK;
123: }
124:
125: my ($symb,$status,$open,$close,$msg,$donebuttonresult,$donemsg);
126: if (($target eq 'tex') || ($toolhash{'gradable'})) {
127: ($symb) = &Apache::lonnet::whichuser();
128: }
129: if ($target eq 'tex') {
130: my $title = &Apache::lonnet::gettitle($symb);
131: $r->print(&mt('External Tool: [_1]','\textit{'.$title.'}').'\\\\');
132: }
133: my ($status,$open,$close,$msg)=&Apache::londatecheck::content_date_check();
134: if ($status ne 'OPEN') {
135: if ($target eq 'tex') {
136: $r->print(&mt('Not open to be viewed').'\end{document}');
137: } else {
138: $r->print($msg);
139: }
140: return OK;
141: } else {
142: ($status,$msg)=&Apache::lonipcheck::ip_access_check();
143: if ($status ne 'OPEN') {
144: if ($target eq 'tex') {
145: $r->print(&mt('Not open to be viewed').'\end{document}');
146: } else {
147: $r->print($msg);
148: }
149: return OK;
150: }
151: }
152: my $launchok = 1;
153: if ($target eq 'tex') {
154: $r->print('\end{document}');
155: } else {
156: my $now = time;
157: my $submittext = &mt('Launch [_1]',$toolhash{'title'});
158: if (($toolhash{'key'} ne '') && ($toolhash{'secret'} ne '') &&
159: ($toolhash{'url'} ne '') && ($launchok)) {
160: my %lti = <i_params($r,$cnum,$cdom,$idx,$submittext,\%toolhash);
161: my $url = $toolhash{'url'};
162: if ($toolhash{'crsappend'} ne '') {
163: $url .= $toolhash{'crsappend'};
164: }
165: $r->print(&launch_html($url,$toolhash{'key'},$toolhash{'secret'},
166: $toolhash{'sigmethod'},$submittext,\%lti));
167: } else {
168: $r->print('<div>'.&mt('External Tool Unavailable').'</div>');
169: }
170: }
171: return OK;
172: }
173:
174: sub lti_params {
175: my ($r,$cnum,$cdom,$idx,$submittext,$toolsref) = @_;
176: my ($version,$context_type,$msgtype,$toolname,$passback,$roster,$locale,
177: $crslabel,$crstitle,%fields,%rolesmap,%display,%custom,@userlangs,$incdom);
178: if (ref($toolsref) eq 'HASH') {
179: $version = $toolsref->{'version'};
180: $toolname = $toolsref->{'title'};
181: $msgtype = $toolsref->{'messagetype'};
182: $incdom = $toolsref->{'incdom'};
183: if (ref($toolsref->{'fields'}) eq 'HASH') {
184: %fields = %{$toolsref->{'fields'}};
185: }
186: if (ref($toolsref->{'roles'}) eq 'HASH') {
187: %rolesmap = %{$toolsref->{'roles'}};
188: }
189: if (ref($toolsref->{'display'}) eq 'HASH') {
190: %display = %{$toolsref->{'display'}};
191: }
192: if (ref($toolsref->{'custom'}) eq 'HASH') {
193: %custom = %{$toolsref->{'custom'}};
194: }
195: $crslabel = $toolsref->{'crslabel'};
196: $crstitle = $toolsref->{'crstitle'};
197: }
198: if ($version eq '') {
199: $version = 'LTI-1p0';
200: }
201: if ($context_type eq '') {
202: $context_type = 'CourseSection';
203: }
204: if ($msgtype eq '') {
205: $msgtype = 'basic-lti-launch-request';
206: }
207: if ($crslabel eq '') {
208: $crslabel = $env{'course.'.$env{'request.course.id'}.'.internal.coursecode'};
209: }
210: if ($crstitle eq '') {
211: $crstitle = $env{'course.'.$env{'request.course.id'}.'.description'};
212: }
213: my $lonhost = $r->dir_config('lonHostID');
214: my $loncaparev = $r->dir_config('lonVersion');
215: my $uname = $env{'user.name'};
216: my $udom = $env{'user.domain'};
217: my @possroles = qw(Instructor ContentDeveloper TeachingAssistant Learner);
218: my ($roleprefix) = ($env{'request.role'} =~ /^(\w+)\./);
219: my $ltirole = $rolesmap{$roleprefix};
220: unless (grep(/^\Q$ltirole\E$/,@possroles)) {
221: $ltirole = 'Learner';
222: }
223: my @possdigest;
224: my $digest_user = &Encode::decode_utf8($uname.':'.$udom);
225: $digest_user = &Digest::SHA::sha1_hex($digest_user);
226: push(@possdigest,$digest_user);
227: if ($env{'course.'.$env{'request.course.id'}.'.languages'} ne '') {
228: @userlangs=(@userlangs,split(/\s*(\,|\;|\:)\s*/,
229: $env{'course.'.$env{'request.course.id'}.'.languages'}));
230: } else {
231: my %langhash = &Apache::loncommon::getlangs($uname,$udom);
232: if ($langhash{'languages'} ne '') {
233: @userlangs = split(/\s*(\,|\;|\:)\s*/,$langhash{'languages'});
234: } else {
235: my %domdefs = &Apache::lonnet::get_domain_defaults($udom);
236: if ($domdefs{'lang_def'} ne '') {
237: @userlangs = ($domdefs{'lang_def'});
238: }
239: }
240: }
241: if (scalar(@userlangs) == 1) {
242: $locale = $userlangs[0];
243: }
244: my ($title,$digest_symb);
245: my ($symb) = &Apache::lonnet::whichuser();
246: if ($symb) {
247: $digest_symb = &Encode::decode_utf8($symb);
248: $digest_symb = &Digest::SHA::sha1_hex($digest_symb);
249: push(@possdigest,$digest_symb);
250: my $navmap = Apache::lonnavmaps::navmap->new();
251: if (ref($navmap)) {
252: my $res = $navmap->getBySymb($symb);
253: if (ref($res)) {
254: $title = $res->compTitle();
255: }
256: }
257: }
258: my $domdesc = &Apache::lonnet::domain($cdom);
259: my $primary_id = &Apache::lonnet::domain($cdom,'primary');
260: my $int_dom = &Apache::lonnet::internet_dom($primary_id);
261: my $portal_url = &Apache::lonnet::course_portal_url($cnum,$cdom);
262:
263: my %ltiparams = (
264: lti_version => $version,
265: lti_message_type => $msgtype,
266: resource_link_title => $title,
267: resource_link_id => $digest_symb,
268: tool_consumer_instance_guid => $lonhost,
269: tool_consumer_instance_description => $domdesc,
270: tool_consumer_info_product_family_code => 'loncapa',
271: tool_consumer_instance_name => $int_dom,
272: tool_consumer_instance_url => $portal_url,
273: tool_consumer_info_version => $loncaparev,
274: user_id => $digest_user,
275: roles => $ltirole,
276: context_id => $env{'request.course.id'},
277: context_type => $context_type,
278: context_label => $crslabel,
279: context_title => $crstitle,
280: launch_presentation_locale => $locale,
281: );
282: my $crshome = $env{'course.'.$env{'request.course.id'}.'.home'};
283: my $crshostname = &Apache::lonnet::hostname($crshome);
284: if ($crshostname) {
285: my $crsprotocol = $Apache::lonnet::protocol{$crshome};
286: unless ($crsprotocol eq 'https') {
287: $crsprotocol = 'http';
288: }
289: }
290: if ($display{'target'}) {
291: $ltiparams{'launch_presentation_document_target'} = $display{'target'};
292: }
293: if ($display{'width'}) {
294: $ltiparams{'launch_presentation_width'} = $display{'width'};
295: }
296: if ($display{'height'}) {
297: $ltiparams{'launch_presentation_height'} = $display{'height'};
298: }
299: if ($fields{'firstname'}) {
300: $ltiparams{'lis_person_name_given'} = $env{'environment.firstname'};
301: }
302: if ($fields{'lastname'}) {
303: $ltiparams{'lis_person_name_family'} = $env{'environment.lastname'};
304: }
305: if ($fields{'fullname'}) {
306: $ltiparams{'lis_person_name_full'} = &Apache::loncommon::plainname($uname,$udom);
307: }
308: if ($fields{'email'}) {
309: my %emails = &Apache::loncommon::getemails($uname,$udom);
310: my $contact_email;
311: foreach my $type ('permanentemail','critnotification','notification') {
312: if ($emails{$type} =~ /\@/) {
313: $contact_email = $emails{$type};
314: last;
315: }
316: }
317: $ltiparams{'lis_person_contact_email_primary'} = $contact_email;
318: }
319: if ($fields{'user'}) {
320: if ($incdom) {
321: $ltiparams{'lis_person_sourcedid'} = $uname.':'.$udom;
322: } else {
323: $ltiparams{'lis_person_sourcedid'} = $uname;
324: }
325: }
326: if (keys(%custom)) {
327: foreach my $key (keys(%custom)) {
328: my $value = $custom{$key};
329: $value =~ s/^\s+|\s+\$//g;
330: if ($value =~ /^\QLONCAPA::env{\E([^\}]+)\}$/) {
331: if (exists($env{$1})) {
332: $value = $env{$1};
333: }
334: }
335: $ltiparams{'custom_'.$key} = $value;
336: }
337: }
338: foreach my $key (keys(%ltiparams)) {
339: $ltiparams{$key} = &Encode::decode_utf8($ltiparams{$key});
340: }
341: $ltiparams{'basiclti_submit'} = $submittext;
342: return %ltiparams;
343: }
344:
345: sub launch_html {
346: my ($url,$key,$secret,$sigmethod,$submittext,$paramsref) = @_;
347: my $hashref = &LONCAPA::ltiutils::sign_params($url,$key,$secret,$sigmethod,$paramsref);
348: my $action = &HTML::Entities::encode($url,'<>&"');
349: my $form = <<"END";
350: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
351: <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
352: <body>
353: <div id="LCltiLaunch">
354: <form name="LCltiLaunchForm" id="LCltiLaunchFormId" action="$action" method="post" encType="application/x-www-form-urlencoded">
355: END
356: if (ref($hashref) eq 'HASH') {
357: foreach my $item (keys(%{$hashref})) {
358: my $type = 'hidden';
359: if ($item eq 'basiclti_submit') {
360: $type = 'submit';
361: }
362: $form .= '<input type="'.$type.'" name="'.$item.'" value="'.$hashref->{$item}.'" id="id_'.$item.'" />'."\n";
363: }
364: }
365: $form .= "</form></div>\n";
366: $form .= <<"ENDJS";
367: <script type="text/javascript">
368: document.getElementById("LCltiLaunch").style.display = "none";
369: nei = document.createElement('input');
370: nei.setAttribute('type','hidden');
371: nei.setAttribute('name','basiclti_submit');
372: nei.setAttribute('value','$submittext');
373: document.getElementById("LCltiLaunchFormId").appendChild(nei);
374: document.LCltiLaunchForm.submit();
375: </script>
376: ENDJS
377: $form .= "</body></html>\n";
378: return $form;
379: }
380:
381: 1;
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