--- loncom/lti/ltiutils.pm 2023/01/23 18:39:46 1.17.2.3
+++ loncom/lti/ltiutils.pm 2022/03/29 20:12:46 1.18
@@ -1,7 +1,7 @@
# The LearningOnline Network with CAPA
# Utility functions for managing LON-CAPA LTI interactions
#
-# $Id: ltiutils.pm,v 1.17.2.3 2023/01/23 18:39:46 raeburn Exp $
+# $Id: ltiutils.pm,v 1.18 2022/03/29 20:12:46 raeburn Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -33,9 +33,15 @@ use Net::OAuth;
use Digest::SHA;
use Digest::MD5 qw(md5_hex);
use Encode;
-use LWP::UserAgent();
+use UUID::Tiny ':std';
use Apache::lonnet;
use Apache::loncommon;
+use Apache::loncoursedata;
+use Apache::lonuserutils;
+use Apache::lonenc();
+use Apache::longroup();
+use Apache::lonlocal;
+use Math::Round();
use LONCAPA qw(:DEFAULT :match);
#
@@ -90,6 +96,148 @@ sub check_nonce {
#
# LON-CAPA as LTI Consumer
#
+# Determine the domain and the courseID of the LON-CAPA course
+# for which access is needed by a Tool Provider -- either to
+# retrieve a roster or store the grade for an instance of an
+# external tool in the course.
+#
+
+sub get_loncapa_course {
+ my ($lonhost,$cid,$errors) = @_;
+ return unless (ref($errors) eq 'HASH');
+ my ($cdom,$cnum);
+ if ($cid =~ /^($match_domain)_($match_courseid)$/) {
+ my ($posscdom,$posscnum) = ($1,$2);
+ my $cprimary_id = &Apache::lonnet::domain($posscdom,'primary');
+ if ($cprimary_id eq '') {
+ $errors->{5} = 1;
+ return;
+ } else {
+ my @intdoms;
+ my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
+ if (ref($internet_names) eq 'ARRAY') {
+ @intdoms = @{$internet_names};
+ }
+ my $cintdom = &Apache::lonnet::internet_dom($cprimary_id);
+ if (($cintdom ne '') && (grep(/^\Q$cintdom\E$/,@intdoms))) {
+ $cdom = $posscdom;
+ } else {
+ $errors->{6} = 1;
+ return;
+ }
+ }
+ my $chome = &Apache::lonnet::homeserver($posscnum,$posscdom);
+ if ($chome =~ /(con_lost|no_host|no_such_host)/) {
+ $errors->{7} = 1;
+ return;
+ } else {
+ $cnum = $posscnum;
+ }
+ } else {
+ $errors->{8} = 1;
+ return;
+ }
+ return ($cdom,$cnum);
+}
+
+#
+# LON-CAPA as LTI Consumer
+#
+# Determine the symb and (optionally) LON-CAPA user for an
+# instance of an external tool in a course -- either to
+# to retrieve a roster or store a grade.
+#
+# Use the digested symb to lookup the real symb in exttools.db
+# and the digested userID to lookup the real userID (if needed).
+# and extract the exttool instance and symb.
+#
+
+sub get_tool_instance {
+ my ($cdom,$cnum,$digsymb,$diguser,$errors) = @_;
+ return unless (ref($errors) eq 'HASH');
+ my ($marker,$symb,$uname,$udom);
+ my @keys = ($digsymb);
+ if ($diguser) {
+ push(@keys,$diguser);
+ }
+ my %digesthash = &Apache::lonnet::get('exttools',\@keys,$cdom,$cnum);
+ if ($digsymb) {
+ $symb = $digesthash{$digsymb};
+ if ($symb) {
+ my ($map,$id,$url) = split(/___/,$symb);
+ $marker = (split(m{/},$url))[3];
+ $marker=~s/\D//g;
+ } else {
+ $errors->{9} = 1;
+ }
+ }
+ if ($diguser) {
+ if ($digesthash{$diguser} =~ /^($match_username):($match_domain)$/) {
+ ($uname,$udom) = ($1,$2);
+ } else {
+ $errors->{10} = 1;
+ }
+ return ($marker,$symb,$uname,$udom);
+ } else {
+ return ($marker,$symb);
+ }
+}
+
+#
+# LON-CAPA as LTI Consumer
+#
+# Retrieve data needed to validate a request from a Tool Provider
+# for a roster or to store a grade for an instance of an external
+# tool in a LON-CAPA course.
+#
+# Retrieve the Consumer key and Consumer secret from the domain
+# configuration or the Tool Provider ID stored in the
+# exttool_$marker db file and compare the Consumer key with the
+# one in the POSTed data.
+#
+# Side effect is to populate the $toolsettings hashref with the
+# contents of the .db file (instance of tool in course) and the
+# $ltitools hashref with the configuration for the tool (at
+# domain level).
+#
+
+sub get_tool_secret {
+ my ($key,$marker,$symb,$cdom,$cnum,$toolsettings,$ltitools,$errors) = @_;
+ return unless ((ref($toolsettings) eq 'HASH') && (ref($ltitools) eq 'HASH') &&
+ (ref($errors) eq 'HASH'));
+ my ($consumer_secret,$nonce_lifetime);
+ if ($marker) {
+ %{$toolsettings}=&Apache::lonnet::dump('exttool_'.$marker,$cdom,$cnum);
+ if ($toolsettings->{'id'}) {
+ my $idx = $toolsettings->{'id'};
+ my %lti = &Apache::lonnet::get_domain_lti($cdom,'consumer');
+ if (ref($lti{$idx}) eq 'HASH') {
+ %{$ltitools} = %{$lti{$idx}};
+ if ($ltitools->{'key'} eq $key) {
+ $consumer_secret = $ltitools->{'secret'};
+ $nonce_lifetime = $ltitools->{'lifetime'};
+ } else {
+ $errors->{11} = 1;
+ return;
+ }
+ } else {
+ $errors->{12} = 1;
+ return;
+ }
+ } else {
+ $errors->{13} = 1;
+ return;
+ }
+ } else {
+ $errors->{14};
+ return;
+ }
+ return ($consumer_secret,$nonce_lifetime);
+}
+
+#
+# LON-CAPA as LTI Consumer
+#
# Verify a signed request using the consumer_key and
# secret for the specific LTI Provider.
#
@@ -124,6 +272,69 @@ sub verify_request {
#
# LON-CAPA as LTI Consumer
#
+# Verify that an item identifier (either roster request:
+# ext_ims_lis_memberships_id, or grade store:
+# lis_result_sourcedid) has not been tampered with, and
+# the secret used to create the unique identifier has not
+# expired.
+#
+# Prepending the current secret (if still valid),
+# or the previous secret (if current one is no longer valid),
+# to a string composed of the :::-separated components
+# must generate the result signature in the lis item ID
+# sent by the Tool Provider.
+#
+
+sub verify_lis_item {
+ my ($sigrec,$context,$digsymb,$diguser,$cdom,$cnum,$toolsettings,$ltitools,$errors) = @_;
+ return unless ((ref($toolsettings) eq 'HASH') && (ref($ltitools) eq 'HASH') &&
+ (ref($errors) eq 'HASH'));
+ my ($has_action, $valid_for);
+ if ($context eq 'grade') {
+ $has_action = $ltitools->{'passback'};
+ $valid_for = $ltitools->{'passbackvalid'} * 86400; # convert days to seconds
+ } elsif ($context eq 'roster') {
+ $has_action = $ltitools->{'roster'};
+ $valid_for = $ltitools->{'rostervalid'};
+ }
+ if ($has_action) {
+ my $secret;
+ if (($toolsettings->{$context.'secretdate'} + $valid_for) > time) {
+ $secret = $toolsettings->{$context.'secret'};
+ } else {
+ $secret = $toolsettings->{'old'.$context.'secret'};
+ }
+ if ($secret) {
+ my $expected_sig;
+ if ($context eq 'grade') {
+ my $uniqid = $digsymb.':::'.$diguser.':::'.$cdom.'_'.$cnum;
+ $expected_sig = (split(/:::/,&get_service_id($secret,$uniqid)))[0];
+ if ($expected_sig eq $sigrec) {
+ return 1;
+ } else {
+ $errors->{18} = 1;
+ }
+ } elsif ($context eq 'roster') {
+ my $uniqid = $digsymb.':::'.$cdom.'_'.$cnum;
+ $expected_sig = (split(/:::/,&get_service_id($secret,$uniqid)))[0];
+ if ($expected_sig eq $sigrec) {
+ return 1;
+ } else {
+ $errors->{19} = 1;
+ }
+ }
+ } else {
+ $errors->{20} = 1;
+ }
+ } else {
+ $errors->{21} = 1;
+ }
+ return;
+}
+
+#
+# LON-CAPA as LTI Consumer
+#
# Sign a request used to launch an instance of an external
# tool in a LON-CAPA course, using the key and secret supplied
# by the Tool Provider.
@@ -164,6 +375,164 @@ sub sign_params {
}
#
+# LON-CAPA as LTI Consumer
+#
+# Generate a signature for a unique identifier (roster request:
+# ext_ims_lis_memberships_id, or grade store: lis_result_sourcedid)
+#
+
+sub get_service_id {
+ my ($secret,$id) = @_;
+ my $sig = Digest::SHA::sha1_hex($secret.':::'.$id);
+ return $sig.':::'.$id;
+}
+
+#
+# LON-CAPA as LTI Consumer
+#
+# Generate and store the time-limited secret used to create the
+# signature in a service request identifier (roster request or
+# grade store). An existing secret past its expiration date
+# will be stored as old<service name>secret, and a new secret
+# <service name>secret will be stored.
+#
+# Secrets are specific to service name and to the tool instance
+# (and are stored in the exttool_$marker db file).
+# The time period a secret remains valid is determined by the
+# domain configuration for the specific tool and the service.
+#
+
+sub set_service_secret {
+ my ($cdom,$cnum,$marker,$name,$now,$toolsettings,$ltitools) = @_;
+ return unless ((ref($toolsettings) eq 'HASH') && (ref($ltitools) eq 'HASH'));
+ my $warning;
+ my ($needsnew,$oldsecret,$lifetime);
+ if ($name eq 'grade') {
+ $lifetime = $ltitools->{'passbackvalid'} * 86400; # convert days to seconds
+ } elsif ($name eq 'roster') {
+ $lifetime = $ltitools->{'rostervalid'};
+ }
+ if ($toolsettings->{$name.'secret'} eq '') {
+ $needsnew = 1;
+ } elsif (($toolsettings->{$name.'secretdate'} + $lifetime) < $now) {
+ $oldsecret = $toolsettings->{$name.'secret'};
+ $needsnew = 1;
+ }
+ if ($needsnew) {
+ if (&get_tool_lock($cdom,$cnum,$marker,$name,$now) eq 'ok') {
+ my $secret = UUID::Tiny::create_uuid_as_string(UUID_V4);
+ $toolsettings->{$name.'secret'} = $secret;
+ my %secrethash = (
+ $name.'secret' => $secret,
+ $name.'secretdate' => $now,
+ );
+ if ($oldsecret ne '') {
+ $secrethash{'old'.$name.'secret'} = $oldsecret;
+ }
+ my $putres = &Apache::lonnet::put('exttool_'.$marker,
+ \%secrethash,$cdom,$cnum);
+ my $delresult = &release_tool_lock($cdom,$cnum,$marker,$name);
+ if ($delresult ne 'ok') {
+ $warning = $delresult ;
+ }
+ if ($putres eq 'ok') {
+ return 'ok';
+ }
+ } else {
+ $warning = 'Could not obtain exclusive lock';
+ }
+ } else {
+ return 'ok';
+ }
+ return;
+}
+
+#
+# LON-CAPA as LTI Consumer
+#
+# Add a lock key to exttools.db for the instance of an external tool
+# when generating and storing a service secret.
+#
+
+sub get_tool_lock {
+ my ($cdom,$cnum,$marker,$name,$now) = @_;
+ # get lock for tool for which secret is being set
+ my $lockhash = {
+ $name."\0".$marker."\0".'lock' => $now.':'.$env{'user.name'}.
+ ':'.$env{'user.domain'},
+ };
+ my $tries = 0;
+ my $gotlock = &Apache::lonnet::newput('exttools',$lockhash,$cdom,$cnum);
+
+ while (($gotlock ne 'ok') && $tries <3) {
+ $tries ++;
+ sleep(1);
+ $gotlock = &Apache::lonnet::newput('exttools',$lockhash,$cdom,$cnum);
+ }
+ return $gotlock;
+}
+
+#
+# LON-CAPA as LTI Consumer
+#
+# Remove a lock key from exttools.db for the instance of an external
+# tool created when generating and storing a service secret.
+#
+
+sub release_tool_lock {
+ my ($cdom,$cnum,$marker,$name) = @_;
+ # remove lock
+ my @del_lock = ($name."\0".$marker."\0".'lock');
+ my $dellockoutcome=&Apache::lonnet::del('exttools',\@del_lock,$cdom,$cnum);
+ if ($dellockoutcome ne 'ok') {
+ return 'Warning: failed to release lock for exttool';
+ } else {
+ return 'ok';
+ }
+}
+
+#
+# LON-CAPA as LTI Consumer
+#
+# Parse XML containing grade data sent by an LTI Provider
+#
+
+sub parse_grade_xml {
+ my ($xml) = @_;
+ my %data = ();
+ my $count = 0;
+ my @state = ();
+ my $p = HTML::Parser->new(
+ xml_mode => 1,
+ start_h =>
+ [sub {
+ my ($tagname, $attr) = @_;
+ push(@state,$tagname);
+ if ("@state" eq "imsx_POXEnvelopeRequest imsx_POXBody replaceResultRequest resultRecord") {
+ $count ++;
+ }
+ }, "tagname, attr"],
+ text_h =>
+ [sub {
+ my ($text) = @_;
+ if ("@state" eq "imsx_POXEnvelopeRequest imsx_POXBody replaceResultRequest resultRecord sourcedGUID sourcedId") {
+ $data{$count}{sourcedid} = $text;
+ } elsif ("@state" eq "imsx_POXEnvelopeRequest imsx_POXBody replaceResultRequest resultRecord result resultScore textString") {
+ $data{$count}{score} = $text;
+ }
+ }, "dtext"],
+ end_h =>
+ [sub {
+ my ($tagname) = @_;
+ pop @state;
+ }, "tagname"],
+ );
+ $p->parse($xml);
+ $p->eof;
+ return %data;
+}
+
+#
# LON-CAPA as LTI Provider
#
# Use the part of the launch URL after /adm/lti to determine
@@ -276,6 +645,180 @@ sub lti_provider_scope {
}
}
+#
+# LON-CAPA as LTI Provider
+#
+# Obtain a list of course personnel and students from
+# the LTI Consumer which launched this instance.
+#
+
+sub get_roster {
+ my ($id,$url,$ckey,$secret) = @_;
+ my %ltiparams = (
+ lti_version => 'LTI-1p0',
+ lti_message_type => 'basic-lis-readmembershipsforcontext',
+ ext_ims_lis_memberships_id => $id,
+ );
+ my $hashref = &sign_params($url,$ckey,$secret,\%ltiparams);
+ if (ref($hashref) eq 'HASH') {
+ my $request=new HTTP::Request('POST',$url);
+ $request->content(join('&',map {
+ my $name = escape($_);
+ "$name=" . ( ref($hashref->{$_}) eq 'ARRAY'
+ ? join("&$name=", map {escape($_) } @{$hashref->{$_}})
+ : &escape($hashref->{$_}) );
+ } keys(%{$hashref})));
+ my $response = &LONCAPA::LWPReq::makerequest('',$request,'','',10);
+ my $message=$response->status_line;
+ if (($response->is_success) && ($response->content ne '')) {
+ my %data = ();
+ my $count = 0;
+ my @state = ();
+ my @items = ('user_id','roles','person_sourcedid','person_name_given','person_name_family',
+ 'person_contact_email_primary','person_name_full','lis_result_sourcedid');
+ my $p = HTML::Parser->new
+ (
+ xml_mode => 1,
+ start_h =>
+ [sub {
+ my ($tagname, $attr) = @_;
+ push(@state,$tagname);
+ if ("@state" eq "message_response memberships member") {
+ $count ++;
+ }
+ }, "tagname, attr"],
+ text_h =>
+ [sub {
+ my ($text) = @_;
+ foreach my $item (@items) {
+ if ("@state" eq "message_response memberships member $item") {
+ $data{$count}{$item} = $text;
+ }
+ }
+ }, "dtext"],
+ end_h =>
+ [sub {
+ my ($tagname) = @_;
+ pop @state;
+ }, "tagname"],
+ );
+ $p->parse($response->content);
+ $p->eof;
+ return %data;
+ }
+ }
+ return;
+}
+
+#
+# LON-CAPA as LTI Provider
+#
+# Passback a grade for a user to the LTI Consumer which originally
+# provided the lis_result_sourcedid
+#
+
+sub send_grade {
+ my ($id,$url,$ckey,$secret,$scoretype,$sigmethod,$msgformat,$total,$possible) = @_;
+ my $score;
+ if ($possible > 0) {
+ if ($scoretype eq 'ratio') {
+ $score = Math::Round::round($total).'/'.Math::Round::round($possible);
+ } elsif ($scoretype eq 'percentage') {
+ $score = (100.0*$total)/$possible;
+ $score = Math::Round::round($score);
+ } else {
+ $score = $total/$possible;
+ $score = sprintf("%.2f",$score);
+ }
+ }
+ if ($sigmethod eq '') {
+ $sigmethod = 'HMAC-SHA1';
+ }
+ my $request;
+ if ($msgformat eq '1.0') {
+ my $date = &Apache::loncommon::utc_string(time);
+ my %ltiparams = (
+ lti_version => 'LTI-1p0',
+ lti_message_type => 'basic-lis-updateresult',
+ sourcedid => $id,
+ result_resultscore_textstring => $score,
+ result_resultscore_language => 'en-US',
+ result_resultvaluesourcedid => $scoretype,
+ result_statusofresult => 'final',
+ result_date => $date,
+ );
+ my $hashref = &sign_params($url,$ckey,$secret,\%ltiparams,$sigmethod);
+ if (ref($hashref) eq 'HASH') {
+ $request=new HTTP::Request('POST',$url);
+ $request->content(join('&',map {
+ my $name = escape($_);
+ "$name=" . ( ref($hashref->{$_}) eq 'ARRAY'
+ ? join("&$name=", map {escape($_) } @{$hashref->{$_}})
+ : &escape($hashref->{$_}) );
+ } keys(%{$hashref})));
+ }
+ } else {
+ srand( time() ^ ($$ + ($$ << 15)) ); # Seed rand.
+ my $nonce = Digest::SHA::sha1_hex(sprintf("%06x%06x",rand(0xfffff0),rand(0xfffff0)));
+ my $uniqmsgid = int(rand(2**32));
+ my $gradexml = <<END;
+<?xml version = "1.0" encoding = "UTF-8"?>
+<imsx_POXEnvelopeRequest xmlns = "http://www.imsglobal.org/services/ltiv1p1/xsd/imsoms_v1p0">
+ <imsx_POXHeader>
+ <imsx_POXRequestHeaderInfo>
+ <imsx_version>V1.0</imsx_version>
+ <imsx_messageIdentifier>$uniqmsgid</imsx_messageIdentifier>
+ </imsx_POXRequestHeaderInfo>
+ </imsx_POXHeader>
+ <imsx_POXBody>
+ <replaceResultRequest>
+ <resultRecord>
+ <sourcedGUID>
+ <sourcedId>$id</sourcedId>
+ </sourcedGUID>
+ <result>
+ <resultScore>
+ <language>en</language>
+ <textString>$score</textString>
+ </resultScore>
+ </result>
+ </resultRecord>
+ </replaceResultRequest>
+ </imsx_POXBody>
+</imsx_POXEnvelopeRequest>
+END
+ chomp($gradexml);
+ my $bodyhash = Digest::SHA::sha1_base64($gradexml);
+ while (length($bodyhash) % 4) {
+ $bodyhash .= '=';
+ }
+ my $gradereq = Net::OAuth->request('consumer')->new(
+ consumer_key => $ckey,
+ consumer_secret => $secret,
+ request_url => $url,
+ request_method => 'POST',
+ signature_method => $sigmethod,
+ timestamp => time(),
+ nonce => $nonce,
+ body_hash => $bodyhash,
+ );
+ $gradereq->add_required_message_params('body_hash');
+ $gradereq->sign();
+ $request = HTTP::Request->new(
+ $gradereq->request_method,
+ $gradereq->request_url,
+ [
+ 'Authorization' => $gradereq->to_authorization_header,
+ 'Content-Type' => 'application/xml',
+ ],
+ $gradexml,
+ );
+ }
+ my $response = &LONCAPA::LWPReq::makerequest('',$request,'','',10);
+ my $message=$response->status_line;
+#FIXME Handle case where pass back of score to LTI Consumer failed.
+}
+
sub setup_logout_callback {
my ($uname,$udom,$server,$ckey,$secret,$service_url,$idsdir,$protocol,$hostname) = @_;
if ($service_url =~ m{^https?://[^/]+/}) {
@@ -290,12 +833,9 @@ sub setup_logout_callback {
);
my $post = &sign_params($service_url,$ckey,$secret,\%ltiparams,
'','','',1);
-
- my $ua=new LWP::UserAgent;
- $ua->timeout(10);
my $request=new HTTP::Request('POST',$service_url);
$request->content($post);
- my $response=$ua->request($request);
+ my $response = &LONCAPA::LWPReq::makerequest('',$request,'','',10);
}
}
return;
@@ -485,6 +1025,252 @@ sub enrolluser {
#
# LON-CAPA as LTI Provider
#
+# Batch addition of users following LTI launch by a user
+# with LTI Instructor status.
+#
+# A list of users is obtained by a call to get_roster()
+# if the calling Consumer support the LTI extension:
+# Context Memberships Service.
+#
+# If a user included in the retrieved list does not currently
+# have a user account in LON-CAPA, an account will be created.
+#
+# If a user already has an account, and the same role and
+# section assigned (currently active), then no change will
+# be made for that user.
+#
+# Information available for new users (besides username and)
+# role) may include: first name, last name, full name (from
+# which middle name will be extracted), permanent e-mail address,
+# and lis_result_sourcedid (for passback of grades).
+#
+# If grades are to be passed back, the passback url will be
+# the same as for the current user's session.
+#
+# The roles which may be assigned will be determined from the
+# LTI roles included in the retrieved roster, and the mapping
+# of LTI roles to LON-CAPA roles configured for this LTI Consumer
+# in the domain configuration.
+#
+# Course Coordinator roles will only be assigned if the current
+# user is also the course owner.
+#
+# The domain configuration for the corresponding Consumer can include
+# a section to assign to LTI users. If the roster includes students
+# any existing student roles with a different section will be expired,
+# and a role in the LTI section will be assigned.
+#
+# For non-student rules (excluding Course Coordinator) a role will be
+# assigned with the LTI section )or no section, if one is not rquired.
+#
+
+sub batchaddroster {
+ my ($item) = @_;
+ return unless(ref($item) eq 'HASH');
+ return unless (ref($item->{'ltiref'}) eq 'HASH');
+ my ($cdom,$cnum) = split(/_/,$item->{'cid'});
+ my $udom = $cdom;
+ my $id = $item->{'id'};
+ my $url = $item->{'url'};
+ my @intdoms;
+ my $intdomsref = $item->{'intdoms'};
+ if (ref($intdomsref) eq 'ARRAY') {
+ @intdoms = @{$intdomsref};
+ }
+ my $uriscope = $item->{'uriscope'};
+ my $ckey = $item->{'ltiref'}->{'key'};
+ my $secret = $item->{'ltiref'}->{'secret'};
+ my $section = $item->{'ltiref'}->{'section'};
+ $section =~ s/\W//g;
+ if ($section eq 'none') {
+ undef($section);
+ } elsif ($section ne '') {
+ my %curr_groups =
+ &Apache::longroup::coursegroups($cdom,$cnum);
+ if (exists($curr_groups{$section})) {
+ undef($section);
+ }
+ }
+ my (%maproles,@possroles);
+ if (ref($item->{'ltiref'}->{'maproles'}) eq 'HASH') {
+ %maproles = %{$item->{'ltiref'}->{'maproles'}};
+ }
+ if (ref($item->{'possroles'}) eq 'ARRAY') {
+ @possroles = @{$item->{'possroles'}};
+ }
+ if (($ckey ne '') && ($secret ne '') && ($id ne '') && ($url ne '')) {
+ my %data = &get_roster($id,$url,$ckey,$secret);
+ if (keys(%data) > 0) {
+ my (%rulematch,%inst_results,%curr_rules,%got_rules,%alerts,%info);
+ my %coursehash = &Apache::lonnet::coursedescription($cdom.'_'.$cnum);
+ my $start = $coursehash{'default_enrollment_start_date'};
+ my $end = $coursehash{'default_enrollment_end_date'};
+ my $domdesc = &Apache::lonnet::domain($udom,'description');
+ my $roster = &Apache::loncoursedata::get_classlist($cdom,$cnum);
+ my $status = &Apache::loncoursedata::CL_STATUS;
+ my $cend = &Apache::loncoursedata::CL_END;
+ my $cstart = &Apache::loncoursedata::CL_START;
+ my $lockedtype=&Apache::loncoursedata::CL_LOCKEDTYPE;
+ my $sec=&Apache::loncoursedata::CL_SECTION;
+ my (@activestudents,@futurestudents,@excludedstudents,@localstudents,%currlist,%advroles);
+ if (grep(/^st$/,@possroles)) {
+ foreach my $user (keys(%{$roster})) {
+ if ($user =~ m/^(.+):$cdom$/) {
+ my $stuname = $1;
+ if ($roster->{$user}[$status] eq "Active") {
+ push(@activestudents,$stuname);
+ @{$currlist{$stuname}} = @{$roster->{$user}};
+ push(@localstudents,$stuname);
+ } elsif (($roster->{$user}[$cstart] > time) && ($roster->{$user}[$cend] > time ||
+ $roster->{$user}[$cend] == 0 || $roster->{$user}[$cend] eq '')) {
+ push(@futurestudents,$stuname);
+ @{$currlist{$stuname}} = @{$roster->{$user}};
+ push(@localstudents,$stuname);
+ } elsif ($roster->{$user}[$lockedtype] == 1) {
+ push(@excludedstudents,$stuname);
+ }
+ }
+ }
+ }
+ if ((@possroles > 1) || ((@possroles == 1) && (!grep(/^st$/,@possroles)))) {
+ my %personnel = &Apache::lonnet::get_course_adv_roles($item->{'cid'},1);
+ foreach my $item (keys(%personnel)) {
+ my ($role,$currsec) = split(/:/,$item);
+ if ($currsec eq '') {
+ $currsec = 'none';
+ }
+ foreach my $user (split(/,/,$personnel{$item})) {
+ push(@{$advroles{$user}{$role}},$currsec);
+ }
+ }
+ }
+ if (($end == 0) || ($end > time) || (@localstudents > 0)) {
+ my (%passback,$pbnum,$numadv);
+ $numadv = 0;
+ foreach my $i (sort { $a <=> $b } keys(%data)) {
+ if (ref($data{$i}) eq 'HASH') {
+ my $entry = $data{$i};
+ my $user = $entry->{'person_sourcedid'};
+ my $uname;
+ if ($user =~ /^($match_username):($match_domain)$/) {
+ $uname = $1;
+ my $possudom = $2;
+ if ($possudom ne $udom) {
+ my $uintdom = &Apache::lonnet::domain($possudom,'primary');
+ if (($uintdom ne '') && (grep(/^\Q$uintdom\E$/,@intdoms))) {
+ $udom = $possudom;
+ }
+ }
+ } elsif ($uname =~ /^match_username$/) {
+ $uname = $user;
+ } else {
+ next;
+ }
+ my $uhome = &Apache::lonnet::homeserver($uname,$udom);
+ if ($uhome eq 'no_host') {
+ my %data;
+ $data{'permanentemail'} = $entry->{'person_contact_email_primary'};
+ $data{'lastname'} = $entry->{'person_name_family'};
+ $data{'firstname'} = $entry->{'person_name_given'};
+ $data{'fullname'} = $entry->{'person_name_full'};
+ my $addresult =
+ &create_user($item->{'ltiref'},$uname,$udom,
+ $domdesc,\%data,\%alerts,\%rulematch,
+ \%inst_results,\%curr_rules,\%got_rules);
+ next unless ($addresult eq 'ok');
+ }
+ if ($env{'request.lti.passbackurl'}) {
+ if ($entry->{'lis_result_sourcedid'} ne '') {
+ unless ($pbnum) {
+ ($pbnum,my $error) = &store_passbackurl($env{'request.lti.login'},
+ $env{'request.lti.passbackurl'},
+ $cdom,$cnum);
+ if ($pbnum eq '') {
+ $pbnum = $env{'request.lti.passbackurl'};
+ }
+ }
+ $passback{$uname."\0".$uriscope."\0".$env{'request.lti.sourcecrs'}."\0".$env{'request.lti.login'}} =
+ $pbnum."\0".$entry->{'lis_result_sourcedid'};
+ }
+ }
+ my $rolestr = $entry->{'roles'};
+ my ($lcrolesref) = &get_lc_roles($rolestr,\@possroles,\%maproles);
+ my @lcroles = @{$lcrolesref};
+ if (@lcroles) {
+ if (grep(/^st$/,@lcroles)) {
+ my $addstu;
+ if (!grep(/^\Q$uname\E$/,@excludedstudents)) {
+ if (grep(/^\Q$uname\E$/,@localstudents)) {
+# Check for section changes
+ if ($currlist{$uname}[$sec] ne $section) {
+ $addstu = 1;
+ &Apache::lonuserutils::modifystudent($udom,$uname,$cdom.'_'.$cnum,
+ undef,undef,'course');
+ } elsif (grep(/^\Q$uname\E$/,@futurestudents)) {
+# Check for access date changes for students with access starting in the future.
+ my $datechange = &datechange_check($currlist{$uname}[$cstart],
+ $currlist{$uname}[$cend],
+ $start,$end);
+ if ($datechange) {
+ $addstu = 1;
+ }
+ }
+ } else {
+ $addstu = 1;
+ }
+ }
+ unless ($addstu) {
+ pop(@lcroles);
+ }
+ }
+ my @okroles;
+ if (@lcroles) {
+ foreach my $role (@lcroles) {
+ unless (($role eq 'st') || (keys(%advroles) == 0)) {
+ if (exists($advroles{$uname.':'.$udom})) {
+ if ((ref($advroles{$uname.':'.$udom}) eq 'HASH') &&
+ (ref($advroles{$uname.':'.$udom}{$role}) eq 'ARRAY')) {
+ if (($section eq '') || ($role eq 'cc') || ($role eq 'co')) {
+ next if (grep(/^none$/,@{$advroles{$uname.':'.$udom}{$role}}));
+ } else {
+ next if (grep(/^\Q$sec\E$/,@{$advroles{$uname.':'.$udom}{$role}}));
+ }
+ }
+ }
+ }
+ push(@okroles,$role);
+ }
+ }
+ if (@okroles) {
+ my $permanentemail = $entry->{'person_contact_email_primary'};
+ my $lastname = $entry->{'person_name_family'};
+ my $firstname = $entry->{'person_name_given'};
+ foreach my $role (@okroles) {
+ my $enrollresult = &enrolluser($udom,$uname,$role,$cdom,$cnum,
+ $section,$start,$end);
+ if (($enrollresult eq 'ok') && ($role ne 'st')) {
+ $numadv ++;
+ }
+ }
+ }
+ }
+ }
+ }
+ if (keys(%passback)) {
+ &Apache::lonnet::put('nohist_lti_passback',\%passback,$cdom,$cnum);
+ }
+ if ($numadv) {
+ &Apache::lonnet::flushcourselogs();
+ }
+ }
+ }
+ }
+ return;
+}
+
+#
+# LON-CAPA as LTI Provider
+#
# Gather a list of available LON-CAPA roles derived
# from a comma separated list of LTI roles.
#
@@ -543,4 +1329,82 @@ sub get_lc_roles {
return (\@lcroles,\@ltiroles);
}
+#
+# LON-CAPA as LTI Provider
+#
+# Compares current start and dates for a user's role
+# with dates to apply for the same user/role to
+# determine if there is a change between the current
+# ones and the updated ones.
+#
+
+sub datechange_check {
+ my ($oldstart,$oldend,$startdate,$enddate) = @_;
+ my $datechange = 0;
+ unless ($oldstart eq $startdate) {
+ $datechange = 1;
+ }
+ if (!$datechange) {
+ if (!$oldend) {
+ if ($enddate) {
+ $datechange = 1;
+ }
+ } elsif ($oldend ne $enddate) {
+ $datechange = 1;
+ }
+ }
+ return $datechange;
+}
+
+#
+# LON-CAPA as LTI Provider
+#
+# Store the URL used by a specific LTI Consumer to process grades passed back
+# by an LTI Provider.
+#
+
+sub store_passbackurl {
+ my ($ltinum,$pburl,$cdom,$cnum) = @_;
+ my %history = &Apache::lonnet::restore($ltinum,'passbackurl',$cdom,$cnum);
+ my ($pbnum,$version,$error);
+ if ($history{'version'}) {
+ $version = $history{'version'};
+ for (my $i=1; $i<=$version; $i++) {
+ if ($history{$i.':pburl'} eq $pburl) {
+ $pbnum = $i;
+ last;
+ }
+ }
+ } else {
+ $version = 0;
+ }
+ if ($pbnum eq '') {
+ # get lock on passbackurl db
+ my $now = time;
+ my $lockhash = {
+ 'lock'."\0".$ltinum."\0".$now => $env{'user.name'}.':'.$env{'user.domain'},
+ };
+ my $tries = 0;
+ my $gotlock = &Apache::lonnet::newput('passbackurl',$lockhash,$cdom,$cnum);
+ while (($gotlock ne 'ok') && ($tries<3)) {
+ $tries ++;
+ sleep 1;
+ $gotlock = &Apache::lonnet::newput('passbackurl',$lockhash,$cdom.$cnum);
+ }
+ if ($gotlock eq 'ok') {
+ if (&Apache::lonnet::store_userdata({pburl => $pburl},
+ $ltinum,'passbackurl',$cdom,$cnum) eq 'ok') {
+ $pbnum = 1+$version;
+ }
+ my $dellock = &Apache::lonnet::del('passbackurl',['lock'."\0".$ltinum."\0".$now],$cdom,$cnum);
+ unless ($dellock eq 'ok') {
+ $error = &mt('error: could not release lockfile');
+ }
+ } else {
+ $error = &mt('error: could not obtain lockfile');
+ }
+ }
+ return ($pbnum,$error);
+}
+
1;