File:  [LON-CAPA] / loncom / enrollment / localenroll.pm
Revision 1.56: download - view: text, annotated - select for diffs
Thu Aug 25 18:01:34 2016 UTC (7 years, 8 months ago) by raeburn
Branches: MAIN
CVS tags: version_2_11_2_uiuc, version_2_11_2_educog, version_2_11_2, HEAD
- Typo.

    1: # functions to glue school database system into Lon-CAPA for 
    2: # automated enrollment
    3: # $Id: localenroll.pm,v 1.56 2016/08/25 18:01:34 raeburn Exp $
    4: #
    5: # Copyright Michigan State University Board of Trustees
    6: #
    7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    8: #
    9: # LON-CAPA is free software; you can redistribute it and/or modify
   10: # it under the terms of the GNU General Public License as published by
   11: # the Free Software Foundation; either version 2 of the License, or
   12: # (at your option) any later version.
   13: #
   14: # LON-CAPA is distributed in the hope that it will be useful,
   15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   17: # GNU General Public License for more details.
   18: #
   19: # You should have received a copy of the GNU General Public License
   20: # along with LON-CAPA; if not, write to the Free Software
   21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   22: #
   23: # /home/httpd/html/adm/gpl.txt
   24: #
   25: # http://www.lon-capa.org/
   26: #
   27: 
   28: =pod
   29: 
   30: =head1 NAME
   31: 
   32: localenroll
   33: 
   34: =head1 SYNOPSIS
   35: 
   36: This is part of the LearningOnline Network with CAPA project
   37: described at http://www.lon-capa.org.
   38: 
   39: 
   40: =head1 NOTABLE SUBROUTINES
   41: 
   42: =over
   43: 
   44: =cut
   45: 
   46: package localenroll;
   47: 
   48: use strict;
   49: 
   50: =pod
   51:  
   52: =item run()
   53:  set this to return 1 if you want the auto enrollment to run
   54: 
   55:  Beginning with LON-CAPA version 2.4, use of this routine is
   56:  deprecated.  Whether or not Autoenroll.pl should run is set
   57:  by the Domain Coordinator via "Set domain configuration",
   58:  provided in the Domain Management section of the Main menu. 
   59: 
   60: =cut
   61: 
   62: sub run() {
   63:     my $dom = shift;
   64:     return 0;
   65: }
   66: 
   67: 
   68: =pod
   69: 
   70: =item fetch_enrollment()
   71: 
   72:  connects to the institutional classlist data source,
   73:  reads classlist data and stores in an XML file
   74:  in /home/httpd/perl/tmp/
   75: 
   76:  classlist files are named as follows:
   77: 
   78:  DOMAIN_COURSE_INSTITUTIONALCODE_classlist.xml
   79: 
   80:  e.g., msu_43551dedcd43febmsul1_fs03nop590001_classlist.xml
   81:  where DOMAIN = msu  COURSE = 43551dedcd43febmsul1 
   82:  INSTITUTIONALCODE = fs03nop590001 
   83:  (MSU's course naming scheme - fs03 = Fall semester 2003, nop =
   84:  department name, 590 = course number, 001 = section number.)
   85: 
   86:  fetch_enrollment requires three arguments -
   87:  $dom - DOMAIN e.g., msu
   88:  $affiliatesref - a reference to a hash of arrays that contains LON-CAPA 
   89:  courses that are to be updated as keys, and institutional coursecodes 
   90:  contributing enrollment to that LON-CAPA course as elements in each array.
   91:  $replyref - a reference to a hash that contains LON-CAPA courses
   92:  that are to be updated as keys, and the total enrollment count in all 
   93:  affiliated sections, as determined from institutional data as hash elements. 
   94: 
   95:  As an example, if fetch_enrollment is called to retrieve institutional
   96:  classlists for a single LON-CAPA course - 43551dedcd43febmsul1 which 
   97:  corresponds to fs03nop590, sections 001, 601 and 602 , and the course
   98:  also accommodates enrollment from a crosslisted course in the ost
   99:  department - fs03ost580002:
  100: 
  101:  the affiliatesref would be a reference to %affiliates which would be:
  102: 
  103:  @{$affiliates{'43551dedcd43febmsul1'}} =
  104:    ("fs03nop590001","fs03nop590601","fs03nop590602","fs03ost580002");
  105: 
  106:  fetch_enrollment would create four files in /home/httpd/perl/tmp/.
  107:  msu_43551dedcd43febmsul1_fs03nop590001_classlist.xml
  108:  msu_43551dedcd43febmsul1_fs03nop590601_classlist.xml
  109:  msu_43551dedcd43febmsul1_fs03nop590602_classlist.xml
  110:  msu_43551dedcd43febmsul1_fs03ost580002_classlist.xml
  111: 
  112:  In each file, student data would be stored in the following format
  113:  
  114:  <student username="smith">
  115:   <autharg>MSU.EDU</autharg>
  116:   <authtype>krb4</authtype>
  117:   <email>smith@msu.edu</email>
  118:   <enddate></enddate>
  119:   <firstname>John</firstname>
  120:   <generation>II</generation>
  121:   <groupID>fs03nop590001</groupID>
  122:   <lastname>Smith</lastname>
  123:   <middlename>D</middlename>
  124:   <startdate></startdate>
  125:   <studentID>A12345678</studentID>
  126:   <credits></credits>
  127:   <inststatus></inststatus>
  128:  </student>
  129:  
  130:  with the following at the top of the file
  131: <?xml version="1.0" encoding="UTF-8"?>
  132: <!DOCTYPE text>
  133: <students>
  134: 
  135:  (all comment - s removed)
  136: 
  137:  and a closing:
  138: </students>
  139: 
  140:  The <startdate> and the <enddate> are the activation date and expiration date
  141:  for this student's role. If they are absent, then the default access start and
  142:  default access end dates are used. The default access dates can be set when 
  143:  the course is created, and can be modified using the Automated Enrollment
  144:  Manager, or via the 'Upload a class list','Enroll a single student' or 
  145:  'Modify student data' utilities in the Enrollment Manager, by checking the 
  146:  'make these dates the default for future enrollment' checkbox. If no default 
  147:  dates have been set, then the tudent role will be active immediately, and will 
  148:  remain active until the role is explicitly expired using ENRL -> Drop students. 
  149:  If dates are to included in the XML file, they should be in the format
  150:  YYYY:MM:DD:HH:MM:SS (: separators required).
  151: 
  152:  The <credits> tag need only be used if the credits earned by the students will 
  153:  be different from the default for the course. The course default is set when the
  154:  course is created and can be modifed by a Domain Coordinator via "View or
  155:  modify a course or community" on the DC's Main Menu screen.
  156: 
  157:  A value for <inststatus> should be the institutional status used for students,
  158:  and should be one of the types defined in the "Institutional user types"
  159:  section in the domain config screen for:
  160:  "Default authentication/language/timezone/portal/types" 
  161: 
  162:  If no status types are defined for the domain this tag can be omitted.
  163:  If Autoupdate.pl is enabled in your domain, updates to the institutional 
  164:  status set here will be updated by Autoupdate.pl, should changes occur.
  165: 
  166:  If there were 10 students in fs03nop590001, 5 students in fs03nop59o601, 
  167:  8 students in fs03nop590602, and 2 students in fs03ost580002,
  168:  then $$reply{'43551dedcd43febmsul1'} = 25
  169: 
  170:  The purpose of the %reply hash is to detect cases where the institutional 
  171:  enrollment is 0 (most likely due to a problem with the data source).
  172:  In such a case, the LON-CAPA course roster is left unchanged (i.e., no
  173:  students are expired, even if automated drops is enabled.
  174:  
  175:  fetch_enrollment should return a 0 or 1, depending on whether a connection
  176:  could be established to the institutional data source.
  177:  0 is returned if no connection could be made.
  178:  1 is returned if connection was successful
  179: 
  180:  A return of 1 is required for the calling modules to perform LON-CAPA
  181:  roster changes based on the contents of the XML classlist file(s), e,g,,
  182:  msu_43551dedcd43febmsul1_fs03nop590001_classlist.xml
  183: 
  184:  XML classlist files are temporary. They are deleted after the enrollment 
  185:  update process in the calling module is complete.
  186: 
  187: 
  188: =cut
  189: 
  190: sub fetch_enrollment {
  191:     my ($dom,$affiliatesref,$replyref) = @_;
  192:     foreach my $crs (sort keys %{$affiliatesref}) {
  193:         $$replyref{$crs} = 0;
  194:     }
  195:     my $okflag = 0;
  196:     return $okflag;
  197: }
  198: 
  199: =pod
  200: 
  201: =item get_sections()
  202: 
  203:  This is called by the Automated Enrollment Manager interface
  204:  (lonpopulate.pm) to create an array of valid sections for 
  205:  a specific institutional coursecode.
  206:  e.g., for MSU coursecode: fs03nop590
  207:  ("001","601","602") would be returned
  208: 
  209:  If the array returned contains at least one element, then 
  210:  the interface offerred to the course coordinator, lists
  211:  official sections and provides a checkbox to use to
  212:  select enrollment in the LON-CAPA course from each official section.  
  213: 
  214:  get_sections takes two arguments - (a) the institutional coursecode
  215:  (in the MSU case this is a concatenation of semester code, department
  216:  and course number), and (b) the LON-CAPA domain that contains the course. 
  217:  
  218:  If there is no access to official course sections at your institution,
  219:  then an empty array is returned, and the Automated Enrollment Manager
  220:  interface will allow the course coordinator to enter section numbers
  221:  in text boxes.
  222:  
  223: 
  224: 
  225: =cut
  226: 
  227: sub get_sections {
  228:     my ($coursecode,$dom) = @_;
  229:     my @secs = ();
  230:     return @secs;
  231: }
  232: 
  233: =pod
  234: 
  235: =item new_course()
  236: 
  237:  This is called by loncreatecourse.pm and 
  238:  lonpopulate.pm to record that fact that a new course section
  239:  has been added to LON-CAPA that requires access to institutional data
  240:  At MSU, this is required, as institutional classlists can only made
  241:  available to faculty who are officially assigned to a course.
  242:  
  243:  The new_course subroutine is used to check that the course owner
  244:  of the LON-CAPA course is permitted to access the institutional
  245:  classlist for any course sections and crosslisted classes that
  246:  the course coordinator wishes to have affiliated with the course.
  247:  
  248:  If access is permitted, then 'ok' is returned.
  249:  The course section or crosslisted course will only be added to the list of
  250:  affiliates if 'ok' is returned.
  251: 
  252:  new_course takes three required arguments -
  253:  (a) the institutional courseID (in the MSU case this is a concatenation of 
  254:  semester code, department code, course number, and section number
  255:  e.g., fs03nop590001).
  256:  (b) the course owner. This is the LON-CAPA username and domain of the course 
  257:  coordinator assigned to the course when it is first created, in the form
  258:  username:domain
  259:  (c) the LON-CAPA domain that contains the course
  260: 
  261:  new_course also takes a fourth (optional) argument -
  262:  (d) the course co-owners, as a comma-separated list of username:domain for
  263:  any co-owners. 
  264: 
  265: =cut
  266: 
  267: sub new_course  {
  268:     my ($course_id,$owner,$dom,$coowners) = @_;
  269:     my $outcome = 'ok';
  270:     return $outcome;
  271: }
  272: 
  273: =pod
  274: 
  275: =item validate_courseID()
  276: 
  277:  This is called whenever a new course section or crosslisted course
  278:  is being affiliated with a LON-CAPA course (i.e., by loncreatecourse.pm
  279:  and the Automated Enrollment Manager in lonpopulate.pm).
  280:  A check is made that the courseID that the course coordinator wishes
  281:  to affiliate with the course is valid according to the institutional
  282:  schedule of official classes 
  283: 
  284:  A valid courseID is confirmed by returning 'ok'
  285: 
  286:  validate_courseID takes two arguments -
  287:  (a) the institutional courseID (in the MSU case this is a concatenation of
  288:  semester code, department code, course number, and section number
  289:  e.g., fs03nop590001).
  290:  (b) the LON-CAPA domain that contains the course
  291: 
  292: =cut  
  293: 
  294: sub validate_courseID {
  295:     my ($course_id,$dom) = @_;
  296:     my $outcome = 'ok';
  297:     return $outcome;   
  298: }
  299: 
  300: =pod
  301: 
  302: =item validate_instcode()
  303: 
  304: This is called when a request is being made for an official course.
  305: A check is made that the institutional code for which a course is
  306: is being requested is valid according to the institutional
  307: schedule of official classes.
  308: 
  309: If the username of the course owner is provided, a more restrictive
  310: test is used, namely that the requestor is listed as instructor of
  311: record for the course in the institution's course schedule/database.
  312: 
  313: validate_instcode takes three arguments -
  314:  (a) the LON-CAPA domain that will contain the course
  315:  (b) the institutional code (in the MSU case this is a concatenation of
  316:  semester code, department code, and course number, e.g., fs03nop590.
  317:  (c) an optional institutional username for the course owner.
  318: 
  319: An array is returned containing (a) the result of the check for a valid 
  320: instcode, (b) an (optional) course description, and (c) the default credits
  321: earned by students when completing this course. If no institutional credits
  322: value is available, the default credits for the course can be set via the
  323: course request form, or via XML in a batch file, of via the web form used
  324: by the Domain Coordinator to create new courses one at a time.
  325: 
  326: A valid instcode is confirmed by returning 'valid'.
  327: 
  328: If no course description is available, '' should be set as
  329: the value of the second item in the returned array.
  330: 
  331: =cut
  332: 
  333: sub validate_instcode {
  334:     my ($dom,$instcode,$owner) = @_;
  335:     my $outcome = '';
  336:     my $description = '';
  337:     my $credits = '';
  338:     return ($outcome,$description,$credits);
  339: }
  340: 
  341: =pod
  342: 
  343: =item validate_crsreq()
  344: 
  345: This is used to check whether a course request should be processed
  346: automatically, or held in a queue pending administrative action at
  347: the institution.
  348: 
  349: Course requests will trigger this check if the process type has been set 
  350: to 'validate' for the course type (official, unofficial, textbook, 
  351: placement or community) and the requestor's affiliation.  Whether
  352: "validate" is an available option in the Domain Configuration menu 
  353: is controlled by auto_courserequest_checks(). 
  354: One scenario is where the request is for an official course, in which case
  355: a check could be made that the requestor is listed as instructor of 
  356: record for the course in the institution's course schedule/database.
  357: 
  358: Other scenarios are possible, and the routine can be customized according
  359: to whatever rules a domain wishes to implement to run validations against
  360: given the data passed in to the routine.
  361: 
  362: validate_crsreq takes seven arguments -
  363:  (a) the LON-CAPA domain that will contain the course.
  364:  (b) the username:domain for the course owner.
  365:  (c) the course type (official, unofficial,textbook, placement or community)
  366:  (d) a comma-separated list of institutional affiliations of 
  367:      the course owner.
  368:  (e) the institutional code (in the MSU case this is a concatenation of
  369:  semester code, department code, and course number, e.g., fs03nop590).
  370:  (f) a comma-separated list of institutional sections included in
  371:      the course request (only applicable to official courses).
  372:  (g) an optional reference to a hash of custom form data.
  373:      The custom form data will come from crsreq_updates(), with one
  374:      additional item: $custominfo->{'_LC_clonefrom'}, provided internally
  375:      (the courseID of the LON-CAPA course being cloned).
  376: 
  377: A valid courserequest is confirmed by returning 'process'.
  378: The following can be returned: process, rejected, pending, approval or 
  379: error (with error condition - no :), followed by a : and then an optional message. 
  380: 
  381: (a) process  - the requestor is the recorded instructor - create the course
  382: 
  383: (b) rejected - the requestor should never be requesting this course, reject the
  384:     request permanently
  385: 
  386: (c) pending - the requestor is not the recorded instructor, but could
  387:     become so after administrative action at the institution. Put the
  388:     request in a queue and, if an official course, check 
  389:     localenroll:validate_instcode() periodically until the status changes to 
  390:     "valid".
  391: 
  392: (d) approval - the request will be held pending review by a Domain Coordinator.
  393: 
  394: (e) error (followed by the error condition).
  395: 
  396: =cut
  397: 
  398: sub validate_crsreq {
  399:     my ($dom,$owner,$crstype,$inststatuslist,$instcode,$instseclist,$custominfo) = @_;
  400:     my $outcome = 'approval';
  401:     return $outcome;
  402: }
  403: 
  404: =pod 
  405: 
  406: =item crsreq_checks()
  407: 
  408: This is used to determine whether the "validate" option should appear in the
  409: possible choices for course request processing in the Domain Configuration 
  410: menu for Course Requests. Ultimately it is called by domainprefs.pm (via: 
  411: lonnet -> lond -> localenroll.pm) The domain configuration menu includes 
  412: a table where columns are course type (official, unofficial, textbook,
  413: placement or community) and rows are institutional affiliations 
  414: (e.g., Faculty, Staff, Student etc.).
  415: 
  416: crsreq_checks() takes three arguments: $dom, $reqtypes, $validations.
  417: $dom - the domain for which validation options are needed.
  418: $reqtypes - ref to an ARRAY of course types (i.e., official, unofficial and community.
  419: $validations - ref to a hash of a hash which will determine whether "validate"
  420: will be one of the possible choices for each course type (outer hash key),
  421: and institutional type (inner hash key).
  422: 
  423: For example to allow validate to be a choice for official classes for Faculty,
  424: req_checks would include:
  425: 
  426: $validations{'official'}{'Faculty'} = 1;
  427: 
  428: This routine is closely tied to validate_crsreq(). "Validate" should not be
  429: a possible choice in the domain configuration menu for a particular course
  430: type/institutional affiliation, unless a corresponding validation code has
  431: been implemented in validate_crsreq().
  432: 
  433: For example at MSU, official courses requested by Faculty will be validated
  434: against the official schedule of classes to check that the requestor is one
  435: of the instructors of record for the course.  In this case validate_crsreq()
  436: includes a call to validate_instcode().
  437: 
  438: =cut
  439: 
  440: sub crsreq_checks {
  441:     my ($dom,$reqtypes,$validations) = @_;
  442:     if ((ref($reqtypes) eq 'ARRAY') && (ref($validations) eq 'HASH')) {
  443:         my (%usertypes,@order);
  444:         if (&inst_usertypes($dom,\%usertypes,\@order) eq 'ok') {
  445:             foreach my $type (@{$reqtypes}) {
  446:                 foreach my $inst_type (@order) {
  447:                     $validations->{$type}{$inst_type} = 0;
  448:                 }
  449:             }
  450:         }
  451:     }
  452:     return 'ok';
  453: }
  454: 
  455: =pod
  456: 
  457: =item crsreq_updates()
  458: 
  459: This is used to customize the LON-CAPA course request process.
  460: There are two hash references: $incoming, and $outgoing; $incoming can
  461: contain additional information collected from the requester, whereas $outgoing
  462: can contain custom items to send back to lonrequestcourse.pm, which creates the
  463: HTML displayed to the user during a course request.
  464: 
  465: Different key-value pairs may be returned to lonrequestcourse.pm in the $outgoing
  466: hashref depending on the current action.  The available actions are:
  467: review, prevalidate, process, created and queued.
  468: 
  469: One scenario would be to return HTML markup in: $outgoing->{'reviewweb'},
  470: i.e., where the action is 'review', to prompt the user to provide additional
  471: information as part of the course request, at the request review stage, 
  472: (i.e,, the page which contains the button used to submit a completed course request).
  473: 
  474: The HTML could contain form elements (e.g., radio buttons etc.). The value(s)
  475: selected by the requester in those form elements will be available in the incoming
  476: hashref, for a subsequent action, if the corresponding keys have been included
  477: in $outgoing->{'formitems'}, i.e., $outgoing will be hash of a hash.  If a
  478: particular form item will the single valued, the value set for the key in the 
  479: inner hash in $outgoing should be 1, otherwise, if it will be multi-valued,
  480: the value should be multiple.
  481: 
  482: The $outgoing hashref can contain a 'formitems' key for both the prevalidate
  483: and process actions, as calls to localenroll::crsreq_update() can originate
  484: in lonrequestcourse::process_request() for both of those actions.
  485: 
  486: The retrieved form values are passed to localenroll::validate_crsreq() as the
  487: optional seventh arg (a hashref) -- $custominfo.
  488: 
  489: =cut
  490: 
  491: sub crsreq_updates {
  492:     my ($cdom,$cnum,$crstype,$action,$ownername,$ownerdomain,$fullname,$title,
  493:         $code,$accessstart,$accessend,$incoming,$outgoing) = @_;
  494:     unless (ref($outgoing) eq 'HASH') {
  495:         return 'fail';
  496:     }
  497:     my %extrainfo;
  498:     if (ref($incoming) eq 'HASH') {
  499:         %extrainfo = %{$incoming};
  500:     }
  501:     if ($action eq 'review') {
  502:         $outgoing->{'reviewweb'} = '';
  503:     } elsif ($action eq 'prevalidate') {
  504:         $outgoing->{'formitems'} = {}; # key=>value, where key is form element name
  505:                                        #             and value is multiple, if there
  506:                                        #             are multiple form elements with
  507:                                        #             the same name.
  508:     } elsif ($action eq 'process') {
  509:         $outgoing->{'formitems'} = {}; # key=>value, where key is form element name
  510:                                        #             and value is multiple, if there
  511:                                        #             are multiple form elements with
  512:                                        #             the same name.
  513:     } elsif ($action eq 'created') {
  514:         $outgoing->{'createdweb'} = '';
  515:         $outgoing->{'createdmsg'} = [{
  516:                                      mt => '',
  517:                                      args => [],
  518:                                     }];
  519:         $outgoing->{'createdactions'} = {
  520:                                             environment => {},
  521:                                         };
  522:                                         # environment can contain key=>value for
  523:                                         # items to set in the course environment.
  524:                                         # These would be items which are NOT included
  525:                                         # in the items set via options in the course
  526:                                         # request form. Currently self-enrollment
  527:                                         # settings are the only ones allowed, i.e.,
  528:                                         # internal.selfenroll_types internal.selfenroll_registered
  529:                                         # internal.selfenroll_section internal.selfenroll_start_access 
  530:                                         # internal.selfenroll_end_access internal.selfenroll_limit
  531:                                         # internal.selfenroll_cap internal.selfenroll_approval
  532:                                         # internal.selfenroll_notifylist
  533:     } elsif ($action eq 'queued') {
  534:         $outgoing->{'queuedmsg'} = [{
  535:                                      mt   => '',
  536:                                      args => [],
  537:                                     }];
  538:         $outgoing->{'queuedweb'} = '';
  539:     }
  540:     return 'ok'
  541: }
  542: 
  543: =pod
  544: 
  545: =item export_grades()
  546:  
  547: This routine can be customized to push grade information to some other gradebook,
  548: LCMS, or administrative system external to LON-CAPA.
  549: 
  550: export_grades() takes five arguments -
  551: (a) the LON-CAPA course ID
  552: (b) the LON-CAPA course domain
  553: (c) a hash reference containing the following: 
  554:     scope    => scope of the grades (e.g., course, map or resource).
  555:     instcode => institutional course code (if an official course)
  556:     crstype  => course type -- Course, Community or Placement
  557:     context  => calling context, e.g., "completion" when a student completes a placement test.
  558: (d) a perl data structure (hash of a hash) containing the grade data.
  559:     in the outer hash, the keys are student's username:domain
  560:     in the inner hash, keys are:  
  561:     id        => student/employee ID
  562:     lastname  => student's last name
  563:     firstname => student's first name
  564:     email     => student's "permannent" e-mail address
  565:     section   => student's LON-CAPA course section
  566:     total     => total points earned
  567:     bytitle   => reference to a hash (keys are question titles, values are points
  568:     bysymb    => reference to a hash (keys are symbs, i.e., unique resource identifiers).
  569: (e) reference to a hash which will contain information to return.
  570:     keys will be the student's username:domain. Value of 1 to show grades pushed 
  571:     successfully. 
  572: 
  573: =cut
  574: 
  575: sub export_grades {
  576:     my ($cnum,$cdom,$hashref,$dataref,$outgoing) = @_;
  577:     my %info;
  578:     if (ref($hashref) eq 'HASH') {
  579:         %info = %{$hashref};
  580:     }
  581:     if ((ref($dataref) eq 'HASH') && (ref($outgoing) eq 'HASH')) {
  582:         foreach my $key (keys(%{$dataref})) {
  583:             $outgoing->{$key} = 1;
  584:         }
  585:         return 'ok';
  586:     } else {
  587:         return 'error';
  588:     }
  589: }
  590: 
  591: =pod
  592: 
  593: =item create_password()
  594: 
  595:  This is called when the authentication method set for the automated 
  596:  enrollment process when enrolling new users in the domain is "localauth".
  597:  This could be signalled for the specific user by the value of localauth
  598:  for the <authtype> tag from the classlist.xml files, or if this is blank,
  599:  the default authtype, set by the domain coordinator when creating the course
  600:  with loncreatecourse.pm.
  601:   
  602:  create_password takes three arguments -
  603:  (a) $authparam - the value of <autharg> from the classlist.xml files,
  604:  or if this blank, the default autharg, set by the domain coordinator when 
  605:  creating the course with loncreatecourse.pm
  606:  (b) $dom - the domain of the new user.
  607:  (c) $username - the username of the new user (currently not actually used)
  608: 
  609:  Four values are returned:
  610:  (a) the value of $authparam - which might have been changed
  611:  (b) a flag to indicate whether a password had been created
  612:  0 means no password created
  613:  1 means password created.  In this case the calling module - Enrollment.pm
  614:  will send the LON-CAPA username and password to the new user's e-mail
  615:  (if one was provided), or to the course owner (if one was not provided and
  616:  the new user was created by the automated process), or to the active
  617:  course coordinator (if the new user was created using the 'update roster
  618:  now' interface included in the Automated Enrollment Manager).  
  619:  (c) a flag to indicate that the authentication method is correct - 'ok'.
  620:  If $authchk is not set to 'ok' then account creation and enrollment of the 
  621:  new user will not occur.
  622:  (d) if a password was created it can be sent along.  This is the password 
  623:  which will be included in the e-mail sent to the new user, or made available    
  624:  to the course owner/course coordinator if no e-mail address is provided. If
  625:  you do not wish to send a password, but want to give instructions on obtaining
  626:  one, you could set $newpasswd as those instructions. (e.g.,
  627:  $newpasswd = '(Please visit room 212, ACNS Bldg. to obtain your password)';
  628:  The value of $newpasswd is NOT written in the user's LON-CAPA passwd file in
  629:  /home/httpd/lonUsers/$dom/a/b/c/abcuser/passwd, which in the case of a user
  630:  employing localauth will contain 'localauth:$authparam'.  If you need to include
  631:  a parameter in the user's passwd file, you should return it as $authparam,
  632:  i.e., the first of the variables returned by create_password().             
  633: 
  634: 
  635: =cut 
  636: 
  637: sub create_password {
  638:     my ($authparam,$dom,$username) = @_;
  639:     my $authchk = 'ok';
  640:     my $newpasswd = '';
  641:     my $create_passwd = 0;
  642:     return ($authparam,$create_passwd,$authchk,$newpasswd);
  643: }
  644: 
  645: =pod
  646: 
  647: =item instcode_format()
  648: 
  649:  Split coursecodes into constituent parts.   
  650:  e.g., INSTITUTIONALCODE = fs03nop590, LON-CAPA COURSEID: 43551dedcd43febmsul1
  651:  (MSU's course naming scheme - fs03 = Fall semester 2003, nop =
  652:  department name, 590 = course number)
  653: 
  654:  Incoming data:
  655:  $dom (domain)
  656:  $$instcodes{'43551dedcd43febmsul1'} = 'fs03nop590' (hash of courseIDs)
  657:  
  658:  fs03nop590 would be split as follows
  659:  @{$codetitles} = ("year","semester","department","number")
  660:  $$codes{'year'} = '2003'
  661:  $$codes{'semester'} = 'Fall'
  662:  $$codes{'department'} = 'nop'
  663:  $$codes{'number'} = '590'
  664: 
  665:  requires six arguments:
  666:  domain ($dom)
  667:  reference to hash of institutional course IDs ($instcodes)  
  668:  reference to hash of codes ($codes)
  669:  reference to array of titles ($codetitles)
  670:  reference to hash of abbreviations used in categories
  671:  reference to hash of arrays specifying sort order used in category titles   
  672: 
  673:  e.g.,     %{$$cat_titles{'Semester'}} = (
  674:                    fs => 'Fall',
  675:                    ss => 'Spring',
  676:                    us => 'Summer');
  677: 
  678:  e.g., @{$$cat_order{'Semester'}} = ('ss','us','fs'); 
  679:  returns 1 parameter: 'ok' if no processing errors. 
  680: 
  681:  Detailed help:
  682:  http://yourloncapaserver/adm/help/Institutional_Integration_Course_Codes.hlp
  683: 
  684: =cut
  685: 
  686: 
  687: sub instcode_format () {
  688:     my ($dom,$instcodes,$codes,$codetitles,$cat_titles,$cat_order) = @_;
  689:     my $outcome = 'ok';
  690:     return $outcome;
  691: }
  692: 
  693: =pod
  694: 
  695: =item possible_instcodes()
  696: 
  697: Gather acceptable values for institutional categories to use in course creation request form for official courses.
  698: 
  699:  requires five arguments:
  700: 
  701:  domain ($dom)
  702:  reference to array of titles ($codetitles)
  703:  reference to hash of abbreviations used in categories ($cat_titles).
  704:  reference to hash of arrays specifying sort order used in 
  705:            category titles ($cat_order).
  706:  reference to array which will contain order of component parts used 
  707:            in institutional code ($code_order).
  708: 
  709:  e.g., 
  710:  @{$codetitles} = ('Year','Semester',"Department','Number');
  711: 
  712:  %{$$cat_titles{'Semester'}} = (
  713:                    fs => 'Fall',
  714:                    ss => 'Spring',
  715:                    us => 'Summer');
  716: 
  717:  @{$$cat_order{'Semester'}} = ('ss','us','fs');
  718:  @{$code_order} = ('Semester','Year','Department','Number');
  719: 
  720:  returns 1 parameter: 'ok' if no processing errors.
  721: 
  722: =cut
  723: 
  724: sub possible_instcodes {
  725:     my ($dom,$codetitles,$cat_titles,$cat_order,$code_order) = @_;
  726:     @{$codetitles} = ();
  727:     %{$$cat_titles{'Semester'}} = ();
  728:     @{$$cat_order{'Semester'}} = ('ss','us','fs');
  729:     @{$code_order} = ();
  730:     return 'ok';
  731: }
  732: 
  733: 
  734: =pod
  735: 
  736: =item institutional_photos()
  737: 
  738:  Called when automated enrollment manager is used to update student photos.
  739: 
  740:  Incoming data: six arguments
  741:  (a) $dom (domain)
  742:  (b) $crs (LONCAPA course number)
  743:  (c) $affiliates: a reference to a hash with the keys set to the 
  744:  institutional course IDs for the course.
  745:  (d) $result: a reference to a hash which will return usernames  
  746:      of students (& separated) in following categories (the keys):
  747:      new, update, missing, same, deleted, noid, nouser. The list 
  748:      includes those students for whom the result of the modification 
  749:      process was either addition of a new photo. update of an
  750:      existing photo, photo was found to be missing from institution's
  751:      data store, photo used is same as before, or photo was 
  752:      deleted from storage on LON-CAPA server housing student's
  753:      information, no student/employee ID was available. 
  754:                
  755:  (e) $action: the type of action needed. (e.g., update, delete);
  756:  (f) $students: a reference to a hash with the keys set to student 
  757:  usernames and domains in the form username:domain, and values set
  758:  to the studentID, if action is required for specific students.  
  759: 
  760:  returns 1 parameter: 'ok' if no processing errors.
  761:  other course or student specific values can be stored as values
  762:  in the appropriate referenced hashes. 
  763: 
  764: =cut
  765: 
  766: sub institutional_photos {
  767:     my ($dom,$crs,$affiliates,$result,$action,$students) = @_;
  768:     my $outcome = 'ok';
  769:     return $outcome;
  770: }
  771: 
  772: =pod
  773: 
  774: =item photo_permission()
  775: 
  776:  Incoming data: three arguments
  777:  (a) $dom (domain)
  778:  (b) $perm_reqd: a reference to a a scalar that is either 'yes'
  779:  if a course owner must indicate acceptance of conditions of use,
  780:  'no' otherwise.
  781:  (c) $conditions: the text of the conditions of use.
  782:     
  783:  returns 1 parameter: 'ok' if no processing errors.
  784:  $$perm_reqd is set to 'yes' or 'no'
  785:  $$agreement is set to conditions of use - plain text string
  786:              which will be displayed in a textarea in a web form.
  787: 
  788: 
  789: =cut
  790: 
  791: sub photo_permission {
  792:    my ($dom,$perm_reqd,$conditions) = @_;
  793:    $$perm_reqd = 'no';
  794:    $$conditions = '';
  795:    my $outcome = 'ok';
  796:    return $outcome;
  797: }
  798: 
  799: =pod
  800: 
  801: =item manager_photo_update()
  802: 
  803:  Incoming data: one argument
  804:  (a) $dom (domain)
  805: 
  806:  returns 2 parameters: update (0 or 1), and comment.
  807:  Called by automated enrollment manager, to determine 
  808:  whether "Update Student photos" button will be available,
  809:  and if so, the message (plain text string) that will be displayed
  810:  with the button. 
  811: 
  812: 
  813: =cut
  814:                                                                                         
  815: sub manager_photo_update {
  816:     my ($dom) = @_;
  817:     my $update = 0;
  818:     my $comment = '';
  819:     return ($update,$comment);
  820: }
  821: 
  822: =pod
  823: 
  824: 
  825: =item check_section()
  826: 
  827:  Incoming data: three arguments (+ fourth optional argument)
  828:  (a) $class - institutional class id (coursecode concatanated with section) 
  829:  (b) $owner - course owner (2.2 and later username:domain; pre-2.2 username;
  830:                             2.6 and later - comma-separated list of 
  831:                             username:domain for course owner and co-owners.)
  832:  (c) $dom - domain of course
  833:  (d) $dbh - optional database handle
  834: 
  835:  returns 1 parameter - $sectioncheck ('ok' or other value). 
  836:  Verifies that at least one of the course owner (or co-owners) have access 
  837:  to classlist for specific class according to institution's SIS
  838:  'ok' if access available  
  839: 
  840: 
  841: =cut
  842: 
  843: sub check_section {
  844:     my ($class,$owner,$dom,$dbh) = @_;
  845:     my $sectioncheck = 'ok';
  846:     return $sectioncheck;
  847: }
  848: 
  849: =pod
  850: 
  851: =item instcode_defaults()
  852: 
  853:  Incoming data: three arguments
  854:  (a) $dom - domain
  855:  (b) $defaults - reference to hash which will contain default regular
  856:                  expression matches for different components of an 
  857:                  institutional course code 
  858:  (c) $code_order - reference to array which will contain order of 
  859:                    component parts used in institutional code.  
  860: 
  861:  returns 1 parameter - ('ok' or other value).
  862:  Used to construct a regular expression to be used when searching for
  863:  courses based on fragments of an institutional code.
  864:  $defaults contains defaults to use for each component, and code_order
  865:  contains keys of hash in order in which they are to be concatenated.
  866: 
  867:  e.g., INSTITUTIONALCODE = fs03nop590
  868:  (MSU's course naming scheme - fs  = semester, 03 = year, nop =
  869:  department name, 590 = course number)
  870: 
  871:      %{$defaults} = (
  872:         'Year' => '\d{2}',
  873:         'Semester' => '^[sfu]s', 
  874:         'Department' => '\w{2,3}',
  875:         'Number' => '\d{3,4}\w?',
  876:      );
  877: 
  878:      @{$code_order} = ('Semester','Year','Department','Number');
  879: 
  880:  Detailed help:
  881:  http://yourloncapaserver/adm/help/Institutional_Integration_Course_Codes.hlp
  882: 
  883: =cut
  884: 
  885: sub instcode_defaults {
  886:     my ($dom,$defaults,$code_order) = @_;
  887:     return 'ok';
  888: }
  889: 
  890: 
  891: =pod
  892: 
  893: =item allusers_info()
  894: 
  895:  Incoming data: three arguments
  896:  (a) $dom - domain
  897:  (b) $instusers - reference to hash which will contain hashes, 
  898:                  where keys will be usernames and value will be a 
  899:                  hash of user information. Keys in the inner hash 
  900:                  will be some or all of: lastname,firstname,
  901:                  middlename, generation, id, inststatus - 
  902:                  institutional status (e.g., faculty,staff,student)
  903:                  Values are all scalars except inststatus,
  904:                  which is an array.
  905:  (c) $instids - reference to hash which will contain ID numbers. 
  906:                 keys will be unique IDs (student or faculty/staff ID)
  907:                 values will be either: scalar (username) or an array 
  908:                 if a single ID matches multiple usernames.
  909:  (d) $lc_users - reference to hash containing LON-CAPA usernames in 
  910:                  in domain $dom, as keys. Needed if institutional
  911:                  data source only allows query by username.
  912:  returns 1 parameter - 'ok' if no processing error, or other value 
  913:                        if an error occurred.
  914:  side effects - populates the $instusers and $instids refs to hashes.
  915:                 with information for all users from all available 
  916:                 institutional datafeeds.
  917: 
  918: 
  919: =cut
  920: 
  921: sub allusers_info {
  922:     my ($dom,$instusers,$instids,$lc_users) = @_;
  923:     my $outcome = 'ok';
  924:     return $outcome; 
  925: }
  926: 
  927: =pod
  928: 
  929: =item get_userinfo()
  930: 
  931:  Incoming data: four required arguments and additional optional arguments
  932:  Two modes of operation:
  933:  (1) Retrieves institutional data for a single user either by username
  934:      if $uname is included as second argument, or by ID if $id is 
  935:      included as a third argument.  Either (b) or (c) must be provided.
  936:      (g), (h) and (i) will be undefined.
  937:  (2) Retrieves institutional user data from search of an institutional
  938:      directory based on a search. (g) and (h) are required.
  939:      (i) is optional. (b) and (c) will be undefined. 
  940: 
  941:  (a) $dom - domain
  942:  (b) $uname - username of user
  943:  (c) $id - student/faculty ID of user
  944:  (d) $instusers - reference to hash which will contain info for user
  945:                  as key = value; keys will be one or all of:
  946:                  lastname,firstname,middlename,generation,id,inststatus -
  947:                  institutional status (e.g., faculty,staff,student)
  948:                  Values are all scalars except inststatus,
  949:                  which is an array.
  950:  (e) $instids - reference to hash which will contain ID numbers - 
  951:                  keys will be unique IDs (student or faculty/staff ID)  
  952:                  values will be either: scalar (username) or an array
  953:                  if a single ID matches multiple usernames.
  954:  (f) $types - optional reference to array which contains 
  955:               institutional types to check.
  956:  (g) $srchby - optional if $uname or $id defined, otherwise required.
  957:                Allowed values include: 1. lastfirst, 2. last, 3. uname
  958:                corresponding to searches by 1. lastname,firstname;
  959:                2. lastname; 3. username
  960:  (h) $srchterm - optional if $uname or $id defined, otherwise required
  961:                 String to search for.
  962:  (i) $srchtype - optional. Allowed values: contains, begins (defaults
  963:                 to exact match otherwise).
  964: 
  965:  returns 1 parameter - 'ok' if no processing error, or other value 
  966:                        if an error occurred.
  967:  side effects - populates the $instusers and $instids refs to hashes.
  968:                 with information for specified username, or specified
  969:                 id, if fifth argument provided, from all available, or 
  970:                 specified (e.g., faculty only) institutional datafeeds,
  971:                 if sixth argument provided.
  972: 
  973:  WARNING: You need to set $outcome to 'ok' once you have customized
  974:           this routine to communicate with an instititional 
  975:           directory data source, otherwise institutional directory 
  976:           searches will always be reported as being unavailable
  977:           in domain $dom.
  978: 
  979: =cut
  980: 
  981: sub get_userinfo {
  982:     my ($dom,$uname,$id,$instusers,$instids,$types,
  983:         $srchby,$srchterm,$srchtype) = @_;
  984:     my $outcome = 'unavailable';
  985:     return $outcome;
  986: }
  987: 
  988: =pod
  989: 
  990: =item get_multusersinfo
  991: 
  992:  (a) $dom - domain
  993:  (b) $type - username or id
  994:  (c) $unamenames - reference to hash containing usernames of users
  995:  (d) $instusers - reference to hash which will contain info for user
  996:                  as key = value; keys will be one or all of:
  997:                  lastname,firstname,middlename,generation,id,inststatus -
  998:                  institutional status (e.g., faculty,staff,student)
  999:                  Values are all scalars except inststatus,
 1000:                  which is an array.
 1001:  (e) $instids - reference to hash which will contain ID numbers -
 1002:                  keys will be unique IDs (student or faculty/staff ID)
 1003:                  values will be either: scalar (username) or an array
 1004:                  if a single ID matches multiple usernames.
 1005: 
 1006:  returns 1 parameter - 'ok' if no processing error, or other value
 1007:                        if an error occurred.
 1008: 
 1009:  side effects - populates the $instusers and $instids refs to hashes.
 1010:                 with information for specified username, or specified
 1011:                 id, if fifth argument provided, from all available, or
 1012:                 specified (e.g., faculty only) institutional datafeeds,
 1013:                 if sixth argument provided.
 1014: 
 1015:  WARNING: You need to set $outcome to 'ok' once you have customized
 1016:           this routine to communicate with an instititional
 1017:           directory data source, otherwise retrieval of institutional
 1018:           user information will always be reported as being unavailable
 1019:           in domain $dom.
 1020: 
 1021: =cut
 1022: 
 1023: sub get_multusersinfo {
 1024:     my ($dom,$type,$usernames,$instusers,$instids) = @_;
 1025:     my $outcome = 'unavailable'; 
 1026:     return $outcome;
 1027: }
 1028: 
 1029: =pod
 1030: 
 1031: =item inst_usertypes() 
 1032: 
 1033:  Starting with LON-CAPA 2.11.0 use of this subroutine
 1034:  is deprecated. The domain configuration web GUI
 1035:  accessible to Domain Coordinators will be used to
 1036:  manage institutional types.  If you have previously
 1037:  customized this routine, then values set there will
 1038:  be used when displaying the "Institutional user types"
 1039:  section in the domain config screen for:
 1040:  "Default authentication/language/timezone/portal/types".
 1041: 
 1042:  Once you have visited that screen and saved the settings,
 1043:  configuration thereafter will be via the web GUI of
 1044:  values stored in the domain's configuration.db file on
 1045:  the primary library server in the domain, and values in
 1046:  inst_usertypes() will no longer be consulted.
 1047:  
 1048:  Incoming data: three arguments
 1049:  (a) $dom - domain
 1050:  (b) $usertypes - reference to hash which will contain 
 1051:                  key = value, where keys are institution 
 1052:                  affiliation types (e.g., Faculty, Student etc.)
 1053:                  and values are titles (e.g., Faculty/Academic Staff)
 1054:  (c) $order - reference to array which will contain the order in
 1055:               which institutional types should be shown
 1056:               when displaying data tables (e.g., default quotas    
 1057:               or updateable user fields (see domainprefs.pm) 
 1058:  returns 1 parameter - 'ok' if no processing error, or other value 
 1059:                         if an error occurred.
 1060: 
 1061: 
 1062: =cut
 1063: 
 1064: sub inst_usertypes {
 1065:     my ($dom,$usertypes,$order) = @_;
 1066:     @{$order} = ();
 1067:     %{$usertypes} = ();
 1068:     my $outcome = 'ok';
 1069:     return $outcome;
 1070: }
 1071: 
 1072: =pod
 1073: 
 1074: =item username_rules()
 1075: 
 1076:  Incoming data: three arguments 
 1077:  (a) $dom - domain
 1078:  (b) $ruleshash - reference to hash containing rules
 1079:                   (a hash of a hash)
 1080:                   keys of top level hash are short names  
 1081:                    (e.g., netid, noncredit) 
 1082:                   for each key, value is a hash
 1083:                       desc => long name for rule  
 1084:                       rule => description of rule
 1085:                       authtype => (krb5,krb4,int, or loc)
 1086:                                  authentication type for rule 
 1087:                       authparm => authentication parameter for rule
 1088:                       authparmfixed => 1 if authparm used when
 1089:                           creating user for rule must be authparm  
 1090:                       authmsg => Message to display describing 
 1091:                                  authentication to use for this rule
 1092: 
 1093:  (c) $rulesorder - reference to array containing rule names 
 1094:                    in order to be displayed
 1095: 
 1096: 
 1097:   returns 'ok' if no processing error.
 1098: 
 1099: =cut
 1100: 
 1101: sub username_rules {
 1102:     my ($dom,$ruleshash,$rulesorder) = @_;
 1103:     my $outcome;
 1104:     return $outcome;
 1105: }
 1106: 
 1107: =pod
 1108: 
 1109: =item id_rules()
 1110: 
 1111:  Incoming data: three arguments
 1112:  (a) $dom - domain
 1113:  (b) $ruleshash - reference to hash containing rules
 1114:                   (a hash of a hash)
 1115:                   keys of top level hash are short names
 1116:                    (e.g., netid, noncredit)
 1117:                   for each key, value is a hash
 1118:                       desc => long name for rule
 1119:                       rule => description of rule
 1120: 
 1121:  (c) $rulesorder - reference to array containing rule names
 1122:                    in order to be displayed
 1123: 
 1124:   returns 'ok' if no processing error.
 1125: 
 1126: =cut
 1127: 
 1128: sub id_rules {
 1129:     my ($dom,$ruleshash,$rulesorder) = @_;
 1130:     my $outcome;
 1131:     return $outcome;
 1132: }
 1133: 
 1134: =pod
 1135: 
 1136: =item selfcreate_rules()
 1137: 
 1138:  Incoming data: three arguments
 1139:  (a) $dom - domain
 1140:  (b) $ruleshash - reference to hash containing rules
 1141:                   (a hash of a hash)
 1142:                   keys of top level hash are short names
 1143:                    (e.g., netid)
 1144:                   for each key, value is a hash
 1145:                       desc => long name for rule
 1146:                       rule => description of rule
 1147: 
 1148:  (c) $rulesorder - reference to array containing rule names
 1149:                    in order to be displayed
 1150: 
 1151:   returns 'ok' if no processing error.
 1152: 
 1153: 
 1154: =cut
 1155: 
 1156: sub selfcreate_rules {
 1157:     my ($dom,$ruleshash,$rulesorder) = @_;
 1158:     my $outcome;
 1159:     return $outcome;
 1160: }
 1161: 
 1162: =pod
 1163: 
 1164: =item username_check() 
 1165: 
 1166:  Incoming data: four arguments
 1167:  (a) $dom - domain (scalar) 
 1168:  (b) $uname - username to compare against rules (scalar)
 1169:  (c) $to_check (reference to array of rule names to check)
 1170:  (d) $resultshash (reference to hash of results)
 1171:                     hash of results for rule checked
 1172:                    - keys are rule names
 1173:                    - values are: 1 or 0 (for matched or unmatched) 
 1174: 
 1175:  returns 'ok' if no processing error.
 1176: 
 1177: 
 1178: =cut
 1179: 
 1180: sub username_check {
 1181:     my ($dom,$uname,$to_check,$resultshash) = @_;
 1182:     my $outcome;
 1183:     return $outcome; 
 1184: }
 1185: 
 1186: =pod
 1187: 
 1188: =item id_check()
 1189: 
 1190:  Incoming data: four arguments
 1191:  (a) $dom - domain (scalar)
 1192:  (b) $id - ID to compare against rules (scalar)
 1193:  (c) $to_check (reference to array of rule names to check)
 1194:  (d) $resultshash (reference to hash of results)
 1195:                     hash of results for rule checked
 1196:                    - keys are rule names
 1197:                    - values are: 1 or 0 (for matched or unmatched)
 1198: 
 1199:  returns 'ok' if no processing error.
 1200: 
 1201: 
 1202: =cut
 1203: 
 1204: sub id_check {
 1205:     my ($dom,$id,$to_check,$resultshash) = @_;
 1206:     my $outcome;
 1207:     return $outcome;
 1208: }
 1209: 
 1210: =pod
 1211: 
 1212: =item selfcreate_check()
 1213: 
 1214:  Incoming data: four arguments
 1215:  (a) $dom - domain (scalar)
 1216:  (b) $selfcreatename - e-mail proposed as username (compare against rules - scalar)
 1217:  (c) $to_check (reference to array of rule names to check)
 1218:  (d) $resultshash (reference to hash of results)
 1219:                    hash of results for rule checked
 1220:                    - keys are rule names
 1221:                    - values are: 1 or 0 (for matched or unmatched)
 1222: 
 1223:  returns 'ok' if no processing error.
 1224: 
 1225: 
 1226: =cut
 1227: 
 1228: sub selfcreate_check {
 1229:     my ($dom,$selfcreatename,$to_check,$resultshash) = @_;
 1230:     my $outcome;
 1231:     return $outcome;
 1232: }
 1233: 
 1234: =pod
 1235: 
 1236: =item AUTOLOAD()
 1237: 
 1238:  Incoming data: none
 1239:  Returns ''
 1240: 
 1241:  Prevents errors when undefined subroutines are called in this package
 1242:  Will allow new routines added in the future to be called from lond etc.
 1243:  without the need for customized versions of local*.pm packages to be
 1244:  modified to include the new subroutines immediately.
 1245: 
 1246:  See "Programming Perl" 3rd ed. pp 296-298.   
 1247: 
 1248: =back
 1249: 
 1250: =cut
 1251: 
 1252: sub AUTOLOAD {
 1253:     our $AUTOLOAD;
 1254:     return '';
 1255: }
 1256: 
 1257: 1;

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