Return to ltiauth.pm CVS log

Up to [LON-CAPA] / loncom / lti

Bug 6754 LON-CAPA as LTI Provider
 - More descriptive name for Consumer Key scalar.
 - Include LON-CAPA courseID in standard format when logging successful
   authentication via basic LTI.

    1: # The LearningOnline Network
    2: # Basic LTI Authentication Module
    3: #
    4: # $Id: ltiauth.pm,v 1.3 2017/12/09 16:15:47 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: use LONCAPA::ltiutils;
   40: 
   41: sub handler {
   42:     my $r = shift;
   43:     my $requri = $r->uri;
   44: #
   45: # Retrieve data POSTed by LTI Consumer on launch  
   46: #
   47:     &Apache::lonacc::get_posted_cgi($r);
   48:     my $params = {};
   49:     foreach my $key (sort(keys(%env))) {
   50:         if ($key =~ /^form\.(.+)$/) {
   51:             $params->{$1} = $env{$key};
   52:         }
   53:     }
   54: 
   55:     unless (keys(%{$params})) {
   56:         &invalid_request($r,1);
   57:         return OK;
   58:     }
   59: 
   60:     unless ($params->{'oauth_consumer_key'} &&
   61:             $params->{'oauth_nonce'} &&
   62:             $params->{'oauth_timestamp'} &&
   63:             $params->{'oauth_version'} &&
   64:             $params->{'oauth_signature'} &&
   65:             $params->{'oauth_signature_method'}) {
   66:         &invalid_request($r,2);
   67:         return OK;
   68:     }
   69: 
   70: #
   71: # Retrieve "internet domains" for all this institution's LON-CAPA
   72: # nodes.
   73: #
   74:     my ($udom,$uname,$uhome,$cdom,$cnum,$symb,$mapurl,@intdoms);
   75:     my $lonhost = $r->dir_config('lonHostID');
   76:     my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
   77:     if (ref($internet_names) eq 'ARRAY') {
   78:         @intdoms = @{$internet_names};
   79:     }
   80: 
   81: #
   82: # For user who launched LTI in Consumer, determine user's domain in 
   83: # LON-CAPA.
   84: #
   85: # Order is:
   86: #
   87: # (a) from custom_userdomain item in POSTed data
   88: # (b) from lis_person_sourcedid in POSTed data
   89: # (c) from default "log-in" domain for node
   90: #     (can support multidomain servers, where specific domain is 
   91: #      first part of hostname).
   92: #
   93: # Note: "internet domain" for user's domain must be one of the
   94: # "internet domain(s)" for the institution's LON-CAPA servers.
   95: #
   96:     if (exists($params->{'custom_userdomain'})) {
   97:         if ($params->{'custom_userdomain'} =~ /^$match_domain$/) {
   98:             my $uprimary_id = &Apache::lonnet::domain($params->{'custom_userdomain'},'primary');
   99:             if ($uprimary_id ne '') {
  100:                 my $uintdom = &Apache::lonnet::internet_dom($uprimary_id);
  101:                 if (($uintdom ne '') && (grep(/^\Q$uintdom\E$/,@intdoms))) {
  102:                     $udom = $params->{'custom_userdomain'};
  103:                 }
  104:             }
  105:         }
  106:     }
  107:     my $defdom = &Apache::lonnet::default_login_domain();
  108:     my ($domain,$possuname,$possudom,$possmapuser);
  109:     if ($env{'form.lis_person_sourcedid'} =~ /^($match_username)\:($match_domain)$/) {
  110:         ($possuname,$possudom) = ($1,$2);
  111:         if ($udom eq '') {
  112:             my $uintdom = &Apache::lonnet::domain($possudom,'primary');
  113:             if (($uintdom ne '') && (grep(/^\Q$uintdom\E$/,@intdoms))) {
  114:                 $udom = $possudom;
  115:                 $possmapuser = 'lis_person_sourcedid';
  116:             } else {
  117:                 $udom = $defdom;
  118:             }
  119:         } elsif ($udom eq $possudom) {
  120:             $possmapuser = 'lis_person_sourcedid';
  121:         }
  122:     }
  123:     unless ($possuname) {
  124:         if ($env{'form.lis_person_sourcedid'} =~ /^$match_username$/) {
  125:             $possuname = $env{'form.lis_person_sourcedid'};
  126:             $possmapuser = 'lis_person_sourcedid';
  127:         } elsif ($env{'form.lis_person_contact_email_primary'} =~ /^$match_username$/) {
  128:             $possuname = $env{'form.lis_person_contact_email_primary'};
  129:             $possmapuser = 'lis_person_contact_email_primary';
  130:         }
  131:         unless ($udom) {
  132:             $udom = $defdom;
  133:         }
  134:     }
  135: 
  136: #
  137: # Determine course's domain in LON-CAPA
  138: #
  139: # Order is:
  140: #
  141: # (a) from custom_coursedomain item in POSTed data
  142: # (b) from tail of requested URL (after /adm/lti) if it has format of a symb  
  143: # (c) from tail of requested URL (after /adm/lti) if it has format of a map 
  144: # (d) from tail of requested URL (after /adm/lti) if it has format /domain/courseID
  145: # (e) from tail of requested URL (after /adm/lti) if it has format /tiny/domain/...
  146: # i.e., a shortened URL (see bug #6400) -- not implemented yet.   
  147: # (f) same as user's domain 
  148: #
  149: # Request invalid if custom_coursedomain is defined and is inconsistent with
  150: # domain contained in requested URL.
  151: #
  152: # Note: "internet domain" for course's domain must be one of the
  153: # internet domains for the institution's LON-CAPA servers.
  154: #
  155: 
  156:     if (exists($params->{'custom_coursedomain'})) {
  157:         if ($params->{'custom_coursedomain'} =~ /^$match_domain$/) {
  158:             my $cprimary_id = &Apache::lonnet::domain($params->{'custom_coursedomain'},'primary');
  159:             if ($cprimary_id ne '') {
  160:                 my $cintdom = &Apache::lonnet::internet_dom($cprimary_id);
  161:                 if (($cintdom ne '') && (grep(/^\Q$cintdom\E$/,@intdoms))) {
  162:                     $cdom = $params->{'custom_coursedomain'};
  163:                 }
  164:             }
  165:         }
  166:     }
  167: 
  168:     my ($tail) = ($requri =~ m{^/adm/lti(|/.*)$});
  169:     my $urlcnum;
  170:     if ($tail ne '') {
  171:         my $urlcdom;
  172:         if ($tail =~ m{^/uploaded/($match_domain)/($match_courseid)/(?:default|supplemental)(?:|_\d+)\.(?:sequence|page)(|___\d+___.+)$}) {
  173:             ($urlcdom,$urlcnum,my $rest) = ($1,$2,$3);
  174:             if (($cdom ne '') && ($cdom ne $urlcdom)) {
  175:                 &invalid_request($r,3);
  176:                 return OK;
  177:             }
  178:             if ($rest eq '') {
  179:                 $mapurl = $tail;
  180:             } else {
  181:                 $symb = $tail;
  182:                 $symb =~ s{^/+}{};
  183:             }
  184: #FIXME Need to handle encrypted URLs 
  185:         } elsif ($tail =~ m{^/($match_domain)/($match_courseid)$}) {
  186:             ($urlcdom,$urlcnum) = ($1,$2);
  187:             if (($cdom ne '') && ($cdom ne $urlcdom)) {
  188:                 &invalid_request($r,4);
  189:                 return OK;
  190:             }
  191:         }
  192:         if (($cdom eq '') && ($urlcdom ne '')) { 
  193:             my $cprimary_id = &Apache::lonnet::domain($urlcdom,'primary');
  194:             if ($cprimary_id ne '') {
  195:                 my $cintdom = &Apache::lonnet::internet_dom($cprimary_id);
  196:                 if (($cintdom ne '') && (grep(/^\Q$cintdom\E$/,@intdoms))) {
  197:                     $cdom = $urlcdom;
  198:                 }
  199:             } else {
  200:                 $urlcnum = '';
  201:             }
  202:         }
  203:     }
  204:     if ($cdom eq '') {
  205:         if ($udom ne '') {
  206:             $cdom = $udom;
  207:         } else {
  208:             $cdom = $defdom;
  209:         }
  210:     }
  211: 
  212: #
  213: # Retrieve information for LTI Consumers in course domain
  214: # and populate hash --  %lti_by_key -- for which keys
  215: # are those defined in domain configuration for LTI.
  216: #
  217:  
  218:     my %lti = &Apache::lonnet::get_domain_lti($cdom,'provider');
  219:     unless (keys(%lti) > 0) {
  220:         &invalid_request($r,5);
  221:         return OK;
  222:     }
  223:     my %lti_by_key;
  224:     if (keys(%lti)) {
  225:         foreach my $id (keys(%lti)) {
  226:             if (ref($lti{$id}) eq 'HASH') {
  227:                 my $key = $lti{$id}{'key'};
  228:                 push(@{$lti_by_key{$key}},$id);
  229:             }
  230:         }
  231:     }
  232: 
  233: #
  234: # Verify the signed request using the secret for those
  235: # Consumers for which the key in the POSTed data matches 
  236: # keys in the domain configuration for LTI.
  237: #
  238:     my $hostname = $r->hostname;
  239:     my $protocol = 'http';
  240:     if ($ENV{'SERVER_PORT'} == 443) {
  241:         $protocol = 'https';
  242:     }
  243: 
  244:     my ($itemid,$consumer_key,$secret,@ltiroles);
  245:     $consumer_key = $params->{'oauth_consumer_key'};
  246:     if (ref($lti_by_key{$consumer_key}) eq 'ARRAY') {
  247:         foreach my $id (@{$lti_by_key{$consumer_key}}) {
  248:             if (ref($lti{$id}) eq 'HASH') {
  249:                 $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($r,6);
  269:         return OK;
  270:     }
  271: 
  272: #
  273: # Determine if nonce in POSTed data has expired.
  274: # If unexpired, confirm it has not already been used.
  275: #
  276:     unless (&LONCAPA::ltiutils::check_nonce($params->{'oauth_nonce'},$params->{'oauth_timestamp'},
  277:                                             $lti{$itemid}{'lifetime'},$cdom,$r->dir_config('lonLTIDir'))) {
  278:         &invalid_request($r,7);
  279:         return OK;
  280:     }
  281: 
  282: #
  283: # Determinine if source of username matches requirement from the 
  284: # domain configuration for the specific LTI Consumer.
  285: # 
  286: 
  287:     if ($lti{$itemid}{'mapuser'} eq $possmapuser) {
  288:         $uname = $possuname;
  289:     } elsif ($lti{$itemid}{'mapuser'} eq 'lis_person_sourcedid') {
  290:         if ($params->{'lis_person_sourcedid'} =~ /^$match_username$/) {
  291:             $uname = $possuname;
  292:         }
  293:     } elsif ($lti{$itemid}{'mapuser'} eq 'lis_person_contact_email_primary') {
  294:         if ($params->{'lis_person_contact_email_primary'} =~ /^$match_username$/) {
  295:             $uname = $params->{'lis_person_contact_email_primary'};
  296:         }
  297:     } elsif (exists($params->{$lti{$itemid}{'mapuser'}})) {
  298:         if ($params->{$lti{$itemid}{'mapuser'}} =~ /^$match_username$/) {
  299:             $uname = $params->{$lti{$itemid}{'mapuser'}};
  300:         }
  301:     }
  302: 
  303: #
  304: # Determine the courseID of the LON-CAPA course to which the
  305: # launch of LON-CAPA should provide access.
  306: #
  307: # Order is:
  308: #
  309: # (a) from course mapping (if the link between Consumer "course" and 
  310: # Provider "course" has been established previously).
  311: # (b) from tail of requested URL (after /adm/lti) if it has format of a symb
  312: # (c) from tail of requested URL (after /adm/lti) if it has format of a map
  313: # (d) from tail of requested URL (after /adm/lti) if it has format /domain/courseID
  314: # (e) from tail of requested URL (after /adm/lti) if it has format /tiny/domain/...
  315: # i.e., a shortened URL (see bug #6400) -- not implemented yet.
  316: #
  317: # If Consumer course included in POSTed data points as a target course which
  318: # has a format which matches a LON-CAPA courseID, but the course does not
  319: # exist, the request is invalid.
  320: # 
  321: 
  322:     my ($sourcecrs,%consumers);
  323:     if ($lti{$itemid}{'mapcrs'} eq 'course_offering_sourcedid') {
  324:         $sourcecrs = $params->{'course_offering_sourcedid'};
  325:     } elsif ($lti{$itemid}{'mapcrs'} eq 'context_id') {
  326:         $sourcecrs = $params->{'context_id'};
  327:     } elsif ($lti{$itemid}{'mapcrs'} ne '') {
  328:         $sourcecrs = $params->{$lti{$itemid}{'mapcrs'}};
  329:     }
  330: 
  331:     my $posscnum;
  332:     if ($sourcecrs ne '') {
  333:         %consumers = &Apache::lonnet::get_dom('lticonsumers',[$sourcecrs],$cdom);
  334:         if (exists($consumers{$sourcecrs})) {
  335:             if ($consumers{$sourcecrs} =~ /^$match_courseid$/) {
  336:                 my $crshome = &Apache::lonnet::homeserver($consumers{$sourcecrs},$cdom);
  337:                 if ($crshome =~ /(con_lost|no_host|no_such_host)/) {
  338:                     &invalid_request($r,8);
  339:                     return OK;
  340:                 } else {
  341:                     $posscnum = $consumers{$sourcecrs};
  342:                 }
  343:             }
  344:         }
  345:     }
  346: 
  347:     if ($urlcnum ne '') {
  348:         if ($posscnum ne '') {
  349:             if ($posscnum ne $urlcnum) {
  350:                 &invalid_request($r,9);
  351:                 return OK;
  352:             } else {
  353:                 $cnum = $posscnum;
  354:             }
  355:         } else {
  356:             my $crshome = &Apache::lonnet::homeserver($urlcnum,$cdom);
  357:             if ($crshome =~ /(con_lost|no_host|no_such_host)/) {
  358:                 &invalid_request($r,10);
  359:                 return OK;
  360:             } else {
  361:                 $cnum = $urlcnum;
  362:             }
  363:         }
  364:     } elsif ($posscnum ne '') {
  365:         $cnum = $posscnum;
  366:     }
  367: 
  368: #
  369: # Get LON-CAPA role to use from role-mapping of Consumer roles
  370: # defined in domain configuration for the appropriate LTI
  371: # Consumer.
  372: #
  373: # If multiple LON-CAPA roles are indicated, choose based
  374: # on the order: cc, in, ta, ep, st
  375: #
  376: 
  377:     my $reqrole;
  378: 
  379:     my @roleorder = ('cc','in','ta','ep','st');
  380:     if ($params->{'roles'} =~ /,/) {
  381:         @ltiroles = split(/\s*,\s*/,$params->{'role'});
  382:     } else {
  383:         my $singlerole = $params->{'roles'};
  384:         $singlerole =~ s/^\s|\s+$//g;
  385:         @ltiroles = ($singlerole);
  386:     }
  387:     if (@ltiroles) {
  388:         if (ref($lti{$itemid}{maproles}) eq 'HASH') {
  389:             my %possroles;
  390:             map { $possroles{$lti{$itemid}{maproles}{$_}} = 1; } @ltiroles;
  391:             my @possibles = keys(%possroles);
  392:             if (@possibles == 1) {
  393:                 if (grep(/^\Q$possibles[0]\E$/,@roleorder)) {
  394:                     $reqrole = $possibles[0];
  395: 
  396:                 }
  397:             } elsif (@possibles > 1) {
  398:                 foreach my $item (@roleorder) {
  399:                     if ($possroles{$item}) {
  400:                         $reqrole = $item;
  401:                         last;
  402:                     }
  403:                 }
  404:             }
  405:         }
  406:     }
  407: 
  408: #
  409: # If no LON-CAPA username  -- is user allowed to create one?
  410: #
  411: 
  412:     my $selfcreate;
  413:     if (($uname ne '') && ($udom ne '')) {
  414:         $uhome = &Apache::lonnet::homeserver($uname,$udom);
  415:         if ($uhome =~ /(con_lost|no_host|no_such_host)/) {
  416:             &Apache::lonnet::logthis(" LTI authorized unknown user $uname:$udom ");
  417:             if (ref($lti{$itemid}{'makeuser'}) eq 'ARRAY') {
  418:                 if (@{$lti{$itemid}{'makeuser'}} > 0) {
  419:                     foreach my $ltirole (@ltiroles) {
  420:                         if (grep(/^\Q$ltirole\E$/,@{$lti{$itemid}{'makeuser'}})) {
  421:                             $selfcreate = 1;
  422:                         }
  423:                     }
  424:                 }
  425:             }
  426:             if ($selfcreate) {
  427: #FIXME Do user creation here.
  428:                 return OK
  429:             } else {
  430:                 &invalid_request($r,11);
  431:                 return OK;
  432:             } 
  433:         } 
  434:     } else {
  435:         &invalid_request($r,12);
  436:         return OK;
  437:     }
  438: 
  439: #
  440: # If no LON-CAPA course available, check if domain's configuration
  441: # for the specific LTI Consumer allows a new course to be created 
  442: # (requires role in Consumer to be: Instructor).
  443: #
  444: 
  445:     if ($cnum eq '') {
  446:         if ((@ltiroles) && (grep(/^Instructor$/,@ltiroles)) &&
  447:             ($lti{$itemid}{'mapcrs'})) {
  448: #FIXME Create a new LON-CAPA course here.
  449:             return OK;
  450:         } else {
  451:             &invalid_request($r,13);
  452:             return OK; 
  453:         }
  454:     }
  455: 
  456: #
  457: # If LON-CAPA course is a Community, and LON-CAPA role
  458: # indicated is cc, change role indicated to co.
  459: # 
  460: 
  461:     if ($reqrole eq 'cc') {
  462:         if (($cdom ne '') && ($cnum ne '')) {
  463:             my %crsenv = &Apache::lonnet::coursedescription($cnum.'_'.$cdom,{ 'one_time' => 1,});
  464:             if ($crsenv{'type'} eq 'Community') {
  465:                 $reqrole = 'co'; 
  466:             }
  467:         }
  468:     }
  469: 
  470: #
  471: # Determine if user has required LON-CAPA role
  472: # in the mapped LON-CAPA course.
  473: #
  474: 
  475:     my $role;
  476:     my %crsroles = &Apache::lonnet::get_my_roles($uname,$udom,'userroles',undef,[$reqrole],[$cdom]);
  477:     if (exists($crsroles{$cnum.':'.$cdom.':'.$reqrole})) {
  478:         $role = $reqrole.'./'.$cdom.'/'.$cnum;
  479: #FIXME Need to accommodate sections
  480:     } elsif (ref($lti{$itemid}{'selfenroll'}) eq 'ARRAY') {
  481:         if (grep(/^\Q$reqrole\E$/,@{$lti{$itemid}{'selfenroll'}})) {
  482: #FIXME Do self-enrollment here
  483:             return OK;
  484:         } else {
  485:             &invalid_request($r,14);
  486:         }
  487:     }
  488: 
  489: #
  490: # Store consumer-to-LON-CAPA course mapping
  491: #
  492:     if (($sourcecrs ne '')  && ($consumers{$sourcecrs} eq '') && ($cnum ne '')) {
  493:         &Apache::lonnet::put_dom('lticonsumers',{ $sourcecrs => $cnum },$cdom);
  494:     }
  495: 
  496: #
  497: # Check if user should be hosted here or switched to another server.
  498: #
  499: 
  500:     &Apache::lonnet::logthis(" LTI authorized user: $uname:$udom role: $role course: $cdom\_$cnum");
  501:     $r->user($uname);
  502:     my ($is_balancer,$otherserver,$hosthere);
  503:     ($is_balancer,$otherserver) =
  504:         &Apache::lonnet::check_loadbalancing($uname,$udom,'login');
  505:     if ($is_balancer) {
  506:         if ($otherserver eq '') {
  507:             my $lowest_load;
  508:             ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($udom);
  509:             if ($lowest_load > 100) {
  510:                 $otherserver = &Apache::lonnet::spareserver($lowest_load,$lowest_load,1,$udom);
  511:             }
  512:         }
  513:         if ($otherserver ne '') {
  514:             my @hosts = &Apache::lonnet::current_machine_ids();
  515:             if (grep(/^\Q$otherserver\E$/,@hosts)) {
  516:                 $hosthere = $otherserver;
  517:             }
  518:         }
  519:     }
  520:     if (($is_balancer) && (!$hosthere)) {
  521:         # login but immediately go to switch server.
  522:         &Apache::lonauth::success($r,$uname,$udom,$uhome,'noredirect');
  523:         if ($symb) {
  524:             $env{'form.symb'} = $symb;
  525:         }
  526:         if ($role) {
  527:             $env{'form.role'} = $role;
  528:         }
  529:         if ($lti{$itemid}{'passback'}) {
  530:             if ($params->{'lis_result_sourcedid'}) {
  531:                 $env{'request.lti.passbackid'} = $params->{'lis_result_sourcedid'};
  532:             }
  533:             if ($params->{'lis_outcome_service_url'}) {
  534:                 $env{'request.lti.passbackurl'} = $params->{'lis_outcome_service_url'};
  535:             }
  536:         }
  537:         if (($lti{$itemid}{'roster'}) && (grep(/^Instructor$/,@ltiroles))) {
  538:             if ($params->{'ext_ims_lis_memberships_id'}) {
  539:                 $env{'request.lti.rosterid'} = $params->{'ext_ims_lis_memberships_id'}; 
  540:             }
  541:             if ($params->{'ext_ims_lis_memberships_url'}) {
  542:                 $env{'request.lti.rosterurl'} = $params->{'ext_ims_lis_memberships_url'};
  543:             }
  544:         }
  545:         $env{'request.lti.login'} = 1;
  546:         foreach my $key (%{$params}) {
  547:             delete($env{'form.'.$key});
  548:         }
  549:         my $redirecturl = '/adm/switchserver';
  550:         if ($otherserver ne '') {
  551:             $redirecturl .= '?otherserver='.$otherserver;
  552:         }
  553:         $r->internal_redirect($redirecturl);
  554:         $r->set_handlers('PerlHandler'=> undef);
  555:     } else {
  556:         # need to login them in, so generate the need data that
  557:         # migrate expects to do login
  558:         foreach my $key (%{$params}) {
  559:             delete($env{'form.'.$key});
  560:         }
  561:         my $ip = $r->get_remote_host();
  562:         my %info=('ip'        => $ip,
  563:                   'domain'    => $udom,
  564:                   'username'  => $uname,
  565:                   'server'    => $lonhost,
  566:                   'lti.login' => 1,
  567:                  );
  568:         if ($role) {
  569:             $info{'role'} = $role;
  570:         }
  571:         if ($symb) {
  572:             $info{'symb'} = $symb; 
  573:         }
  574:         if ($lti{$itemid}{'passback'}) {
  575:             if ($params->{'lis_result_sourcedid'}) {
  576:                 $info{'lti.passbackid'} = $params->{'lis_result_sourcedid'}
  577:             }
  578:             if ($params->{'lis_outcome_service_url'}) {
  579:                 $info{'lti.passbackurl'} = $params->{'lis_outcome_service_url'}
  580:             }
  581:         }
  582:         if (($lti{$itemid}{'roster'}) && (grep(/^Instructor$/,@ltiroles))) {
  583:             if ($params->{'ext_ims_lis_memberships_id'}) {
  584:                 $info{'lti.rosterid'} = $params->{'ext_ims_lis_memberships_id'};
  585:             }
  586:             if ($params->{'ext_ims_lis_memberships_url'}) {
  587:                 $info{'lti.rosterurl'} = $params->{'ext_ims_lis_memberships_url'};
  588:             }
  589:         }
  590:         unless ($info{'symb'}) {
  591:             if ($mapurl) {
  592:                 $info{'origurl'} = $mapurl;
  593:                 if ($mapurl =~ m{/default_\d+\.sequence$}) {
  594:                     $info{'origurl'} .=  (($mapurl =~/\?/)?'&':'?').'navmap=1';
  595:                 }
  596:             } else {
  597:                 unless ($tail eq '/adm/roles') {
  598:                     $info{'origurl'} = '/adm/navmaps';
  599:                 }
  600:             }
  601:         }
  602:         if (($is_balancer) && ($hosthere)) {
  603:             $info{'noloadbalance'} = $hosthere;
  604:         }
  605:         my $token = &Apache::lonnet::tmpput(\%info,$lonhost);
  606:         $env{'form.token'} = $token;
  607:         $r->internal_redirect('/adm/migrateuser');
  608:         $r->set_handlers('PerlHandler'=> undef);
  609:     }
  610:     return OK;
  611: }
  612: 
  613: sub invalid_request {
  614:     my ($r,$num) = @_;
  615:     &Apache::loncommon::content_type($r,'text/html');
  616:     $r->send_http_header;
  617:     if ($r->header_only) {
  618:         return;
  619:     }
  620:     &Apache::lonlocal::get_language_handle($r);
  621:     $r->print(
  622:         &Apache::loncommon::start_page('Invalid LTI call').
  623:         &mt('Invalid LTI call [_1]',$num).
  624:         &Apache::loncommon::end_page());
  625:     return;
  626: }
  627: 
  628: 1;