1: # Apache::NSDL::ToTheGateway
2: #
3: # ToTheGateway.pm
4: # API for passing information from NSDL to the Gateway Server
5: #
6: # For more documentation, read the POD documentation
7: # of this module with the perldoc command:
8: #
9: # perldoc ./ToTheGateway.pm
10: #
11: # Brief description
12: # =================
13: #
14: # This module contains functionality for
15: # transferring information from NSDL to the Gateway Server.
16: #
17: # In terms of the overall data flow, the
18: # '=====>' below indicates the role of this
19: # module.
20: #
21: # NSDL =========> Gateway --------> LON-CAPA
22: # LON-CAPA -----> Gateway --------> NSDL
23: #
24: # SUBROUTINES:
25: # NSDL->answer_list_records_request
26: # NSDL->answer_search_request
27: # NSDL->answer_metadata_record_request
28: # NSDL->answer_resource_request
29:
30: # Year 2002
31: # Scott Harrison
32: # February-May
33: #
34: ###
35:
36: package Apache::NSDL::ToTheGateway;
37:
38: # ================================================================ DEPENDENCIES
39: use strict; # enforce handling of variables, references and subroutines
40: use Apache::Constants qw(:common);
41: use Apache::GATEWAY::Common;
42: use Apache::NSDL::FromTheGateway;
43:
44: # ============================================================ MODULE VARIABLES
45: my $VERSION = sprintf("%d.%02d", q$Revision: 1.7 $ =~ /(\d+)\.(\d+)/);
46: my $hostname='nsdl.lon-capa.org';
47:
48: # ================================================================= SUBROUTINES
49:
50: # ----------------------------- Handling routine called via Apache and mod_perl
51: sub handler {
52: my $r = shift;
53: Apache::GATEWAY::Common::readCGI($r);
54: my $output;
55: if ($ENV{'form.verb'} eq 'GetRecord') {
56: # arguments: identifier, metadataPrefix
57: if(!defined($ENV{'form.identifier'})) {
58: my $responseDate=Apache::GATEWAY::Common::responseDate();
59: my $requestURL=Apache::GATEWAY::Common::requestURL();
60: $output=(<<END);
61: <?xml version="1.0" encoding="UTF-8"?>
62: <OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/"
63: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
64: xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/
65: http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd">
66: <responseDate>$responseDate</responseDate>
67: <request>$requestURL</request>
68: <error code="badArgument">Missing identifier argument</error>
69: </OAI-PMH>
70: END
71: }
72: elsif(!defined($ENV{'form.metadataPrefix'})) {
73: my $responseDate=Apache::GATEWAY::Common::responseDate();
74: my $requestURL=Apache::GATEWAY::Common::requestURL();
75: $output=(<<END);
76: <?xml version="1.0" encoding="UTF-8"?>
77: <OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/"
78: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
79: xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/
80: http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd">
81: <responseDate>$responseDate</responseDate>
82: <request>$requestURL</request>
83: <error code="badArgument">Missing metadataPrefix argument</error>
84: </OAI-PMH>
85: END
86: }
87: elsif ($ENV{'form.metadataPrefix'} ne 'oai_dc' and
88: $ENV{'form.metadataPrefix'} ne 'loncapa_ieeelom') {
89: my $responseDate=Apache::GATEWAY::Common::responseDate();
90: my $requestURL=Apache::GATEWAY::Common::requestURL();
91: $output=(<<END);
92: <?xml version="1.0" encoding="UTF-8"?>
93: <OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/"
94: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
95: xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/
96: http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd">
97: <responseDate>$responseDate</responseDate>
98: <request>$requestURL</request>
99: <error code="cannotDisseminateFormat">Cannot disseminate the requested
100: metadata format</error>
101: </OAI-PMH>
102: END
103: }
104: else {
105: my $status;
106: ($status,$output)=
107: Apache::NSDL::FromTheGateway::view_LONCAPAgateway_metadata_record(\%ENV);
108: }
109: }
110: elsif ($ENV{'form.verb'} eq 'Identify') {
111: # arguments: none
112: my $responseDate=Apache::GATEWAY::Common::responseDate();
113: my $requestURL=Apache::GATEWAY::Common::requestURL();
114: $output=(<<END);
115: <?xml version="1.0" encoding="UTF-8"?>
116: <OAI-PMH
117: xmlns="http://www.openarchives.org/OAI/2.0/"
118: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
119: xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/
120: http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd">
121: <responseDate>$responseDate</responseDate>
122: <requestURL>$requestURL</requestURL>
123: <Identify >
124: <repositoryName>The LearningOnline Network with CAPA</repositoryName>
125: <baseURL>http://$hostname/OAI-script</baseURL>
126: <protocolVersion>1.1</protocolVersion>
127: <adminEmail>mailto:korte\@lite.msu.edu</adminEmail>
128: <description>
129: <oai-identifier xmlns="http://www.openarchives.org/OAI/2.0/oai-identifier"
130: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
131: xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai-identifier
132: http://www.openarchives.org/OAI/2.0/oai-identifier.xsd">
133: <scheme>oai</scheme>
134: <repositoryIdentifier>loncapa</repositoryIdentifier>
135: <delimiter>:</delimiter>
136: <sampleIdentifier>oai:loncapa:harrison2002-1</sampleIdentifier>
137: </oai-identifier>
138: </description>
139: <description>
140: <eprints xmlns="http://www.openarchives.org/OAI/2.0/eprints"
141: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
142: xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/eprints
143: http://www.openarchives.org/OAI/2.0/eprints.xsd">
144: <content>
145: <URL>http://$hostname/info/content.html</URL>
146: <text>Educational materials from the LearningOnline Network</text>
147: </content>
148: <metadataPolicy>
149: <text>Metadata can be used by authorized users</text>
150: </metadataPolicy>
151: <dataPolicy>
152: <text>Full content, i.e. preprints may not be harvested by robots</text>
153: </dataPolicy>
154: <submissionPolicy>
155: <text>Submissions can be made by institutions with installed
156: LON-CAPA servers.</text>
157: </submissionPolicy>
158: </eprints>
159: </description>
160: </Identify>
161: </OAI-PMH>
162: END
163: }
164: elsif ($ENV{'form.verb'} eq 'ListIdentifiers') {
165: # arguments: until, from, set, resumptionToken
166: # $output=
167: # Apache::NSDL::FromTheGateway::search_against_LONCAPAgateway(\%ENV);
168: # no full implementation scheme yet so...
169: my $responseDate=Apache::GATEWAY::Common::responseDate();
170: my $requestURL=Apache::GATEWAY::Common::requestURL();
171: $output=(<<END);
172: <?xml version="1.0" encoding="UTF-8"?>
173: <OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/"
174: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
175: xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/
176: http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd">
177: <responseDate>$responseDate</responseDate>
178: <request>$requestURL</request>
179: <error code="noSetHierarchy">No set hierarchy available yet for this
180: gateway.</error>
181: </OAI-PMH>
182: END
183: }
184: elsif ($ENV{'form.verb'} eq 'ListMetadataFormats') {
185: # arguments: identifier
186: my $responseDate=Apache::GATEWAY::Common::responseDate();
187: my $requestURL=Apache::GATEWAY::Common::requestURL();
188: $output=(<<END);
189: <?xml version="1.0" encoding="UTF-8"?>
190: <ListMetadataFormats
191: xmlns="http://www.openarchives.org/OAI/1.1/OAI_ListMetadataFormats"
192: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
193: xsi:schemaLocation="http://www.openarchives.org/OAI/1.1/OAI_ListMetadataFormats
194: http://www.openarchives.org/OAI/1.1/OAI_ListMetadataFormats.xsd">
195: <responseDate>$responseDate</responseDate>
196: <requestURL>$requestURL</requestURL>
197: <metadataFormat>
198: <metadataPrefix>oai_dc</metadataPrefix>
199: <schema>http://www.openarchives.org/OAI/1.1/dc.xsd</schema>
200: <metadataNamespace>http://purl.org/dc/elements/1.1/</metadataNamespace>
201: </metadataFormat>
202: <metadataFormat>
203: <metadataPrefix>loncapa_ieeelom</metadataPrefix>
204: <schema>http://nsdl.lon-capa.org/lom/6.4/ieeelom.xsd</schema>
205: <metadataNamespace>http://nsdl.lon-capa.org/lom/6.4/</metadataNamespace>
206: </metadataFormat>
207: </ListMetadataFormats>
208: END
209: }
210: elsif ($ENV{'form.verb'} eq 'ListRecords') {
211: # arguments: until, from, set, resumptionToken
212: # $output=
213: # Apache::NSDL::FromTheGateway::search_against_LONCAPAgateway(\%ENV);
214: my $responseDate=Apache::GATEWAY::Common::responseDate();
215: my $requestURL=Apache::GATEWAY::Common::requestURL();
216: $output=(<<END);
217: <?xml version="1.0" encoding="UTF-8"?>
218: <OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/"
219: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
220: xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/
221: http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd">
222: <responseDate>$responseDate</responseDate>
223: <request>$requestURL</request>
224: <error code="noSetHierarchy">No set hierarchy available yet for this
225: gateway.</error>
226: </OAI-PMH>
227: END
228: }
229: elsif ($ENV{'form.verb'} eq 'ListSets') {
230: # arguments: resumptionToken
231: # $output='not yet implemented';
232: my $responseDate=Apache::GATEWAY::Common::responseDate();
233: my $requestURL=Apache::GATEWAY::Common::requestURL();
234: $output=(<<END);
235: <?xml version="1.0" encoding="UTF-8"?>
236: <OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/"
237: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
238: xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/
239: http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd">
240: <responseDate>$responseDate</responseDate>
241: <request>$requestURL</request>
242: <error code="noSetHierarchy">No set hierarchy available yet for this
243: gateway.</error>
244: </OAI-PMH>
245: END
246: }
247: else {
248: my $responseDate=Apache::GATEWAY::Common::responseDate();
249: my $requestURL=Apache::GATEWAY::Common::requestURL();
250: $output=(<<END);
251: <?xml version="1.0" encoding="UTF-8"?>
252: <OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/"
253: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
254: xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/
255: http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd">
256: <responseDate>$responseDate</responseDate>
257: <request>$requestURL</request>
258: <error code="badVerb">Illegal OAI verb</error>
259: </OAI-PMH>
260: END
261: }
262: $r->content_type('text/xml');
263: $r->send_http_header;
264: return(OK) if $r->header_only;
265: $r->print(<<END);
266: $output
267: END
268:
269: # $output=~s/\>/\>/g;
270: # $output=~s/\</\</g;
271: # my $cgi;
272: # foreach my $key (keys %ENV) {
273: # if ($key=~/^form\./) {
274: # $cgi.="$key: $ENV{$key}\n";
275: # }
276: # }
277: # $r->content_type('text/html');
278: # $r->send_http_header;
279: # return(OK) if $r->header_only;
280: # $r->print(<<END);
281: #<html>
282: #<head><title>Test Output</title></head>
283: #<body>
284: #<h1>Apache::NSDL::ToTheGateway</h1>
285: #<h2>Input</h2>
286: #<pre>
287: #$cgi
288: #</pre>
289: #<h2>Output</h2>
290: #<pre>
291: #$output
292: #</pre>
293: #</body>
294: #</html>
295: #END
296: return(OK);
297: }
298:
299: # ------------------------------------------- NSDL->answer_list_records_request
300: sub answer_list_records_request {
301: # Not yet implemented
302: # Need to specifically characterize INPUT arguments and OUTPUT data
303: }
304:
305: # ------------------------------------------------- NSDL->answer_search_request
306: sub answer_search_request {
307: my ($url)=@_;
308: return "will have http querying strategy against NSDL servers\n";
309: }
310:
311: # ---------------------------------------- NSDL->answer_metadata_record_request
312: sub answer_metadata_record_request {
313: my ($eref)=@_;
314: return Apache::NSDL::FromTheGateway($eref);
315: }
316:
317: # ----------------------------------------------- NSDL->answer_resource_request
318: sub answer_resource_request {
319: my ($eref)=@_;
320: return Apache::NSDL::FromTheGateway($eref);
321: }
322:
323: 1;
324:
325: __END__
326:
327: =pod
328:
329: =head1 NAME
330:
331: B<Apache::NSDL::ToTheGateway> - API for passing information from NSDL to the Gateway Server
332:
333: =head1 SYNOPSIS
334:
335: use Apache::NSDL::ToTheGateway;
336:
337: my $arrayref=
338: Apache::NSDL::ToTheGateway::answer_list_records_request
339: ($OAI_protocol_request);
340:
341: =head1 DESCRIPTION
342:
343: This module contains functionality for
344: transferring information from NSDL to the Gateway Server.
345:
346: In terms of the overall data flow, the
347: '=====>' below indicates the role of this
348: module.
349:
350: B<NSDL =========E<gt> Gateway> --------E<gt> LON-CAPA
351:
352: LON-CAPA -----E<gt> Gateway --------E<gt> NSDL
353:
354: =head2 EXIT CODES
355:
356: The subroutines of this module all output an exit code which
357: describes the status of function completion. The exit code
358: may be followed by a more descriptive message such as:
359:
360: FORMATERROR:Sun May 5 20:15:16 GMT 2002:missing 'protocol://' pattern
361:
362: =over 4
363:
364: =item *
365:
366: B<'SUCCESS'>, information was found and is being returned
367:
368: =item *
369:
370: B<'EMPTY'>, everything functioned properly, but no information was present
371:
372: =item *
373:
374: B<'BADEMPTY'>, everything appeared to function properly, but no information
375: was present (which defies expectation); this is useful for detecting phantom
376: cases of connectivity when verifying test cases of vertical software partitions
377:
378: =item *
379:
380: B<'TIMEOUT'>, the request is taking WAY too long
381:
382: =item *
383:
384: B<'FORMATERROR'>, the input argument is not formatted correctly in a way that
385: can be processed by the NSDL server
386:
387: =item *
388:
389: B<'CONNECTIONFAILURE'>, the NSDL server cannot be contacted
390:
391: =back
392:
393: =head2 SUBROUTINES
394:
395: Note that the subroutines all output an exit code which
396: describes the status of function completion.
397:
398: In the case of failed function completion, the other
399: output argument(s) will typically only be 'NULL' values.
400:
401: =over 4
402:
403: =item B<Apache::NSDL::answer_list_records_request>
404:
405: =over 4
406:
407: =item B<Input> - Scalar string
408:
409: Take in an OAI-format request for a specific NSDL server.
410:
411: =item B<Output> - Scalar string, Scalar array reference
412:
413: An exit code is returned as a scalar string.
414:
415: A list of records returned via an array reference.
416:
417: =item B<Description>
418:
419: This lists the records matching a given request.
420: The request comes from the Gateway Server, B<and the information
421: passes from NSDL I<to the> GATEWAY>.
422:
423: =item B<Status of Implementation>
424:
425: n/a
426:
427: =back
428:
429: =item B<Apache::NSDL::answer_search_request>
430:
431: =over 4
432:
433: =item B<Input> - Scalar string
434:
435: Take in an OAI-format request for a specific NSDL server (a search expression
436: is passed).
437:
438: =item B<Output> - Scalar string, Scalar array reference
439:
440: An exit code is returned as a scalar string.
441:
442: A list of relevant records (matching the search request) returned via an
443: array reference.
444:
445: =item B<Description>
446:
447: This lists the records matching a given search request.
448: The request comes from the Gateway Server, B<and the information
449: passes from NSDL I<to the> GATEWAY>.
450:
451: =item B<Status of Implementation>
452:
453: n/a
454:
455: =back
456:
457: =item B<Apache::NSDL::answer_metadata_record_request>
458:
459: =over 4
460:
461: =item B<Input> - Scalar string
462:
463: Take in an OAI-format request for a specific NSDL server resource's
464: metadata.
465:
466: =item B<Output> - Scalar string, Scalar string reference
467:
468: An exit code is returned as a scalar string.
469:
470: The metadata entries for the resource; returned via a scalar reference.
471:
472: =item B<Description>
473:
474: This lists the records matching a given request.
475: The request comes from the Gateway Server, B<and the information
476: passes from NSDL I<to the> GATEWAY>.
477:
478: =item B<Status of Implementation>
479:
480: n/a
481:
482: =back
483:
484: =item B<Apache::NSDL::answer_resource_request>
485:
486: =over 4
487:
488: =item B<Input> - Scalar string
489:
490: Take in an OAI-format request for a specific NSDL server's
491: resource content.
492:
493: =item B<Output> - Scalar string, Scalar string reference
494:
495: An exit code is returned as a scalar string.
496:
497: A reference to the resource content (now physically present in computer
498: memory).
499:
500: =item B<Description>
501:
502: This provides the content of the resource matching a given request.
503: The request comes from the Gateway Server, B<and the information
504: passes from NSDL I<to the> GATEWAY>.
505:
506: =item B<Status of Implementation>
507:
508: n/a
509:
510: =back
511:
512: =back
513:
514: =head1 README
515:
516: B<Apache::NSDL::ToTheGateway>
517: is part of the NSDL-LONCAPA Gateway Server system.
518: Please see http://nsdl.lon-capa.org/ for more information.
519:
520: =head1 AUTHOR
521:
522: Scott Harrison, 2002
523:
524: =head1 PREREQUISITES
525:
526: This module requires the C<strict> module.
527:
528: =head1 COREQUISITES
529:
530: Apache::NSDL::FromTheGateway
531: Apache::GATEWAY::ToNSDL
532: Apache::GATEWAY::FromNSDL
533: Apache::GATEWAY::ToLONCAPA
534: Apache::GATEWAY::FromLONCAPA
535: Apache::LONCAPA::FromTheGateway
536: Apache::LONCAPA::ToTheGateway
537:
538: =head1 SEE ALSO
539:
540: http://www.lon-capa.org/
541:
542: http://www.smete.org/
543:
544: Also visit the other Apache::NSDL::*, Apache::LONCAPA::*,
545: and Apache::GATEWAY::* manpages.
546:
547: =head1 OSNAMES
548:
549: linux
550:
551: =cut
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