1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
|
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.binding.atom.provider;
import static org.apache.tuscany.sca.binding.atom.provider.AtomBindingUtil.entry;
import static org.apache.tuscany.sca.binding.atom.provider.AtomBindingUtil.feedEntry;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.net.URLDecoder;
import java.util.StringTokenizer;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.namespace.QName;
import org.apache.abdera.Abdera;
import org.apache.abdera.factory.Factory;
import org.apache.abdera.model.Collection;
import org.apache.abdera.model.Document;
import org.apache.abdera.model.Feed;
import org.apache.abdera.model.Link;
import org.apache.abdera.model.Service;
import org.apache.abdera.model.Workspace;
import org.apache.abdera.parser.ParseException;
import org.apache.abdera.parser.Parser;
import org.apache.commons.codec.binary.Base64;
import org.apache.tuscany.sca.databinding.Mediator;
import org.apache.tuscany.sca.implementation.data.collection.Entry;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.impl.DataTypeImpl;
import org.apache.tuscany.sca.interfacedef.util.XMLType;
import org.apache.tuscany.sca.invocation.InvocationChain;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.invocation.MessageFactory;
import org.apache.tuscany.sca.runtime.RuntimeWire;
/**
* A resource collection binding listener, implemented as a servlet and
* registered in a servlet host provided by the SCA hosting runtime.
*/
class AtomBindingListenerServlet extends HttpServlet {
private static final Logger logger = Logger.getLogger(AtomBindingListenerServlet.class.getName());
private static final long serialVersionUID = 1L;
private final static Factory abderaFactory = Abdera.getNewFactory();
private final static Parser abderaParser = Abdera.getNewParser();
private RuntimeWire wire;
private Invoker getFeedInvoker;
private Invoker getAllInvoker;
private Invoker queryInvoker;
private Invoker getInvoker;
private Invoker postInvoker;
private Invoker postMediaInvoker;
private Invoker putInvoker;
private Invoker putMediaInvoker;
private Invoker deleteInvoker;
private MessageFactory messageFactory;
private String title;
private Mediator mediator;
private DataType<?> itemClassType;
private DataType<?> itemXMLType;
private boolean supportsFeedEntries;
/**
* Constructs a new binding listener.
*
* @param wire
* @param messageFactory
* @param feedType
*/
AtomBindingListenerServlet(RuntimeWire wire, MessageFactory messageFactory, Mediator mediator, String title) {
this.wire = wire;
this.messageFactory = messageFactory;
this.mediator = mediator;
this.title = title;
// Get the invokers for the supported operations
Operation getOperation = null;
for (InvocationChain invocationChain : this.wire.getInvocationChains()) {
invocationChain.setAllowsPassByReference(true);
Operation operation = invocationChain.getTargetOperation();
String operationName = operation.getName();
if (operationName.equals("getFeed")) {
getFeedInvoker = invocationChain.getHeadInvoker();
} else if (operationName.equals("getAll")) {
getAllInvoker = invocationChain.getHeadInvoker();
} else if (operationName.equals("query")) {
queryInvoker = invocationChain.getHeadInvoker();
} else if (operationName.equals("get")) {
getInvoker = invocationChain.getHeadInvoker();
getOperation = operation;
} else if (operationName.equals("put")) {
putInvoker = invocationChain.getHeadInvoker();
} else if (operationName.equals("putMedia")) {
putMediaInvoker = invocationChain.getHeadInvoker();
} else if (operationName.equals("post")) {
postInvoker = invocationChain.getHeadInvoker();
} else if (operationName.equals("postMedia")) {
postMediaInvoker = invocationChain.getHeadInvoker();
} else if (operationName.equals("delete")) {
deleteInvoker = invocationChain.getHeadInvoker();
}
}
// Determine the collection item type
itemXMLType = new DataTypeImpl<Class<?>>(String.class.getName(), String.class, String.class);
Class<?> itemClass = getOperation.getOutputType().getPhysical();
if (itemClass == org.apache.abdera.model.Entry.class) {
supportsFeedEntries = true;
}
DataType<XMLType> outputType = getOperation.getOutputType();
QName qname = outputType.getLogical().getElementName();
qname = new QName(qname.getNamespaceURI(), itemClass.getSimpleName());
itemClassType = new DataTypeImpl<XMLType>("java:complexType", itemClass, new XMLType(qname, null));
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// No authentication required for a get request
// Get the request path
String path = URLDecoder.decode(getPath(request), "UTF-8");
logger.info(">>> FeedEndPointServlet " + request.getRequestURI());
// Handle an Atom request
if (path != null && path.equals("/atomsvc")) {
/*
<?xml version='1.0' encoding='UTF-8'?>
<service xmlns="http://www.w3.org/2007/app" xmlns:atom="http://www.w3.org/2005/Atom">
<workspace>
<atom:title type="text">resource</atom:title>
<collection href="http://luck.ibm.com:8084/customer">
<atom:title type="text">entries</atom:title>
<accept>application/atom+xml;type=entry</accept>
<categories />
</collection>
</workspace>
</service>
*/
// Return the Atom service document
response.setContentType("application/atomsvc+xml; charset=utf-8");
Service service = abderaFactory.newService();
//service.setText("service");
Workspace workspace = abderaFactory.newWorkspace();
workspace.setTitle("resource");
String href = request.getRequestURL().toString();
href = href.substring(0, href.length() - "/atomsvc".length());
Collection collection = workspace.addCollection("collection", "atom/feed");
collection.setTitle("entries");
collection.setAttributeValue("href", href);
collection.setAccept("entry");
collection.addCategories().setFixed(false);
workspace.addCollection(collection);
service.addWorkspace(workspace);
//FIXME add prettyPrint support
try {
service.getDocument().writeTo(response.getOutputStream());
} catch (IOException ioe) {
throw new ServletException(ioe);
}
} else if (path == null || path.length() == 0 || path.equals("/")) {
// Return a feed containing the entries in the collection
Feed feed = null;
if (supportsFeedEntries) {
// The service implementation supports feed entries, invoke its getFeed operation
Message requestMessage = messageFactory.createMessage();
Message responseMessage;
if (request.getQueryString() != null) {
requestMessage.setBody(new Object[] {request.getQueryString()});
responseMessage = queryInvoker.invoke(requestMessage);
} else {
responseMessage = getFeedInvoker.invoke(requestMessage);
}
if (responseMessage.isFault()) {
throw new ServletException((Throwable)responseMessage.getBody());
}
feed = (Feed)responseMessage.getBody();
} else {
// The service implementation does not support feed entries,
// invoke its getAll operation to get the data item collection, then create
// feed entries from the items
Message requestMessage = messageFactory.createMessage();
Message responseMessage;
if (request.getQueryString() != null) {
requestMessage.setBody(new Object[] {request.getQueryString()});
responseMessage = queryInvoker.invoke(requestMessage);
} else {
responseMessage = getAllInvoker.invoke(requestMessage);
}
if (responseMessage.isFault()) {
throw new ServletException((Throwable)responseMessage.getBody());
}
Entry<Object, Object>[] collection =
(Entry<Object, Object>[])responseMessage.getBody();
if (collection != null) {
// Create the feed
feed = abderaFactory.newFeed();
// Set the feed title
if (title != null) {
feed.setTitle(title);
} else {
feed.setTitle("Feed");
}
// Add entries to the feed
for (Entry<Object, Object> entry: collection) {
org.apache.abdera.model.Entry feedEntry = feedEntry(entry, itemClassType, itemXMLType, mediator, abderaFactory);
feed.addEntry(feedEntry);
}
}
}
if (feed != null) {
// Write the Atom feed
response.setContentType("application/atom+xml; charset=utf-8");
try {
feed.getDocument().writeTo(response.getOutputStream());
} catch (IOException ioe) {
throw new ServletException(ioe);
}
} else {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
}
} else if (path.startsWith("/")) {
// Return a specific entry in the collection
org.apache.abdera.model.Entry feedEntry;
// Invoke the get operation on the service implementation
Message requestMessage = messageFactory.createMessage();
String id = path.substring(1);
requestMessage.setBody(new Object[] {id});
Message responseMessage = getInvoker.invoke(requestMessage);
if (responseMessage.isFault()) {
throw new ServletException((Throwable)responseMessage.getBody());
}
if (supportsFeedEntries) {
// The service implementation returns a feed entry
feedEntry = responseMessage.getBody();
} else {
// The service implementation only returns a data item, create an entry
// from it
Entry<Object, Object> entry = new Entry<Object, Object>(id, responseMessage.getBody());
feedEntry = feedEntry(entry, itemClassType, itemXMLType, mediator, abderaFactory);
}
// Write the Atom entry
if (feedEntry != null) {
response.setContentType("application/atom+xml; charset=utf-8");
try {
feedEntry.writeTo(getWriter(response));
} catch (IOException ioe) {
throw new ServletException(ioe);
}
} else {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
}
} else {
// Path doesn't match any known pattern
response.sendError(HttpServletResponse.SC_NOT_FOUND);
}
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,
IOException {
// Authenticate the user
String user = processAuthorizationHeader(request);
if (user == null) {
unauthorized(response);
return;
}
// Get the request path
String path = URLDecoder.decode(getPath(request), "UTF-8");
if (path == null || path.length() == 0 || path.equals("/")) {
org.apache.abdera.model.Entry createdFeedEntry = null;
// Create a new Atom entry
String contentType = request.getContentType();
if (contentType.startsWith("application/atom+xml")) {
// Read the entry from the request
org.apache.abdera.model.Entry feedEntry;
try {
Document<org.apache.abdera.model.Entry> doc = abderaParser.parse(request.getReader());
feedEntry = doc.getRoot();
} catch (ParseException pe) {
throw new ServletException(pe);
}
// Let the component implementation create it
if (supportsFeedEntries) {
// The service implementation supports feed entries, pass the entry to it
Message requestMessage = messageFactory.createMessage();
requestMessage.setBody(new Object[] {feedEntry});
Message responseMessage = postInvoker.invoke(requestMessage);
if (responseMessage.isFault()) {
throw new ServletException((Throwable)responseMessage.getBody());
}
createdFeedEntry = responseMessage.getBody();
} else {
// The service implementation does not support feed entries, pass the data item to it
Message requestMessage = messageFactory.createMessage();
Entry<Object, Object> entry = entry(feedEntry, itemClassType, itemXMLType, mediator);
requestMessage.setBody(new Object[] {entry.getKey(), entry.getData()});
Message responseMessage = postInvoker.invoke(requestMessage);
if (responseMessage.isFault()) {
throw new ServletException((Throwable)responseMessage.getBody());
}
entry.setKey(responseMessage.getBody());
createdFeedEntry = feedEntry(entry, itemClassType, itemXMLType, mediator, abderaFactory);
}
} else if (contentType != null) {
// Create a new media entry
// Get incoming headers
String title = request.getHeader("Title");
String slug = request.getHeader("Slug");
// Let the component implementation create the media entry
Message requestMessage = messageFactory.createMessage();
requestMessage.setBody(new Object[] {title, slug, contentType, request.getInputStream()});
Message responseMessage = postMediaInvoker.invoke(requestMessage);
if (responseMessage.isFault()) {
throw new ServletException((Throwable)responseMessage.getBody());
}
createdFeedEntry = responseMessage.getBody();
} else {
response.sendError(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE);
}
// A new entry was created successfully
if (createdFeedEntry != null) {
// Set location of the created entry in the Location header
Link link = createdFeedEntry.getSelfLink();
if (link != null) {
response.addHeader("Location", link.getHref().toString());
}
// Write the created Atom entry
response.setStatus(HttpServletResponse.SC_CREATED);
response.setContentType("application/atom+xml; charset=utf-8");
try {
createdFeedEntry.writeTo(getWriter(response));
} catch (ParseException pe) {
throw new ServletException(pe);
}
} else {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
}
} else {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
}
}
private Writer getWriter(HttpServletResponse response) throws UnsupportedEncodingException, IOException {
Writer writer = new OutputStreamWriter(response.getOutputStream(), "UTF-8");
return writer;
}
@Override
protected void doPut(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Authenticate the user
String user = processAuthorizationHeader(request);
if (user == null) {
unauthorized(response);
return;
}
// Get the request path
String path = URLDecoder.decode(getPath(request), "UTF-8");
if (path != null && path.startsWith("/")) {
String id = path.substring(1);
// Update an Atom entry
String contentType = request.getContentType();
if (contentType.startsWith("application/atom+xml")) {
// Read the entry from the request
org.apache.abdera.model.Entry feedEntry;
try {
Document<org.apache.abdera.model.Entry> doc = abderaParser.parse(request.getReader());
feedEntry = doc.getRoot();
} catch (ParseException pe) {
throw new ServletException(pe);
}
// Let the component implementation create it
if (supportsFeedEntries) {
// The service implementation supports feed entries, pass the entry to it
Message requestMessage = messageFactory.createMessage();
requestMessage.setBody(new Object[] {id, feedEntry});
Message responseMessage = putInvoker.invoke(requestMessage);
if (responseMessage.isFault()) {
Object body = responseMessage.getBody();
if (body.getClass().getName().endsWith(".NotFoundException")) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
} else {
throw new ServletException((Throwable)responseMessage.getBody());
}
}
} else {
// The service implementation does not support feed entries, pass the data item to it
Message requestMessage = messageFactory.createMessage();
Entry<Object, Object> entry = entry(feedEntry, itemClassType, itemXMLType, mediator);
requestMessage.setBody(new Object[] {entry.getKey(), entry.getData()});
Message responseMessage = putInvoker.invoke(requestMessage);
if (responseMessage.isFault()) {
Object body = responseMessage.getBody();
if (body.getClass().getName().endsWith(".NotFoundException")) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
} else {
throw new ServletException((Throwable)responseMessage.getBody());
}
}
}
} else if (contentType != null) {
// Updated a media entry
// Let the component implementation create the media entry
Message requestMessage = messageFactory.createMessage();
requestMessage.setBody(new Object[] {id, contentType, request.getInputStream()});
Message responseMessage = putMediaInvoker.invoke(requestMessage);
Object body = responseMessage.getBody();
if (responseMessage.isFault()) {
if (body.getClass().getName().endsWith(".NotFoundException")) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
} else {
throw new ServletException((Throwable)responseMessage.getBody());
}
}
} else {
response.sendError(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE);
}
} else {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
}
}
@Override
protected void doDelete(HttpServletRequest request, HttpServletResponse response) throws ServletException,
IOException {
// Authenticate the user
String user = processAuthorizationHeader(request);
if (user == null) {
unauthorized(response);
return;
}
// Get the request path
String path = URLDecoder.decode(getPath(request), "UTF-8");
String id;
if (path != null && path.startsWith("/")) {
id = path.substring(1);
} else {
id = "";
}
// Delete a specific entry from the collection
Message requestMessage = messageFactory.createMessage();
requestMessage.setBody(new Object[] {id});
Message responseMessage = deleteInvoker.invoke(requestMessage);
if (responseMessage.isFault()) {
Object body = responseMessage.getBody();
if (body.getClass().getName().endsWith(".NotFoundException")) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
} else {
throw new ServletException((Throwable)responseMessage.getBody());
}
}
}
/**
* Retrieve the path considering embedded container and/or webapp container
* @param request
* @return
*/
private String getPath(HttpServletRequest request) {
String path = null;
String requestURI = request.getRequestURI();
if(! requestURI.endsWith("/")) {
requestURI += "/";
}
if(request.getContextPath() == null || request.getContextPath().length() == 0) {
//embedded container
path = request.getRequestURI().substring(request.getServletPath().length());
} else {
//web-container case...
path = request.getRequestURI().substring(request.getContextPath().length() + request.getServletPath().length());
}
return path;
}
/**
* Process the authorization header
*
* @param request
* @return
* @throws ServletException
*/
private String processAuthorizationHeader(HttpServletRequest request) throws ServletException {
// FIXME temporarily disabling this as it doesn't work with all browsers
if (true)
return "admin";
try {
String authorization = request.getHeader("Authorization");
if (authorization != null) {
StringTokenizer tokens = new StringTokenizer(authorization);
if (tokens.hasMoreTokens()) {
String basic = tokens.nextToken();
if (basic.equalsIgnoreCase("Basic")) {
String credentials = tokens.nextToken();
String userAndPassword = new String(Base64.decodeBase64(credentials.getBytes()));
int colon = userAndPassword.indexOf(":");
if (colon != -1) {
String user = userAndPassword.substring(0, colon);
String password = userAndPassword.substring(colon + 1);
// Authenticate the User.
if (authenticate(user, password)) {
return user;
}
}
}
}
}
} catch (Exception e) {
throw new ServletException(e);
}
return null;
}
/**
* Authenticate a user.
*
* @param user
* @param password
* @return
*/
private boolean authenticate(String user, String password) {
// TODO Handle this using SCA security policies
return ("admin".equals(user) && "admin".equals(password));
}
/**
* Reject an unauthorized request.
*
* @param response
*/
private void unauthorized(HttpServletResponse response) throws IOException {
response.setHeader("WWW-Authenticate", "BASIC realm=\"Tuscany\"");
response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
}
}
|