aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/OpenSim/ApplicationPlugins/Rest/Inventory/RestInventoryServices.cs
blob: 5de2cb4d4cd994e477bffb0d7265e95d0b2de90d (plain)
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
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the OpenSim Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */

using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Xml;
using OpenJPEGNet;
using OpenSim.Framework;
using OpenSim.Framework.Servers;
using OpenSim.Framework.Communications;
using OpenSim.Framework.Communications.Cache;
using libsecondlife;
using Nini.Config;

namespace OpenSim.ApplicationPlugins.Rest.Inventory
{

    public class RestInventoryServices : IRest
    {

        private bool       enabled = false;
        private string     qPrefix = "inventory";

        /// <summary>
        /// A simple constructor is used to handle any once-only
        /// initialization of working classes.
        /// </summary>

        public RestInventoryServices()
        {

            Rest.Log.InfoFormat("{0} Inventory services initializing", MsgId);
            Rest.Log.InfoFormat("{0} Using REST Implementation Version {1}", MsgId, Rest.Version);

            // If a relative path was specified for the handler's domain, 
            // add the standard prefix to make it absolute, e.g. /admin

            if (!qPrefix.StartsWith(Rest.UrlPathSeparator))
            {
                qPrefix = Rest.Prefix + Rest.UrlPathSeparator + qPrefix;
            }

            // Register interface using the absolute URI.

            Rest.Plugin.AddPathHandler(DoInventory,qPrefix,Allocate);

            // Activate if everything went OK

            enabled = true;

            Rest.Log.InfoFormat("{0} Inventory services initialization complete", MsgId);

        }

        /// <summary>
        /// Post-construction, pre-enabled initialization opportunity
        /// Not currently exploited.
        /// </summary>

        public void Initialize()
        {
        }

        /// <summary>
        /// Called by the plug-in to halt REST processing. Local processing is
        /// disabled, and control blocks until all current processing has 
        /// completed. No new processing will be started
        /// </summary>

        public void Close()
        {
            enabled = false;
            Rest.Log.InfoFormat("{0} Inventory services closing down", MsgId);
        }

        /// <summary>
        /// This property is declared locally because it is used a lot and
        /// brevity is nice.
        /// </summary>

        internal string MsgId
        {
            get { return Rest.MsgId; }
        }

        #region Interface

        /// <summary>
        /// The plugin (RestHandler) calls this method to allocate the request
        /// state carrier for a new request. It is destroyed when the request
        /// completes. All request-instance specific state is kept here. This
        /// is registered when this service provider is registered.
        /// </summary>

        private RequestData Allocate(OSHttpRequest request, OSHttpResponse response)
        {
            return (RequestData) new InventoryRequestData(request, response, qPrefix);
        }

        /// <summary>
        /// This method is registered with the handler when this service provider
        /// is initialized. It is called whenever the plug-in identifies this service
        /// provider as the best match.
        /// It handles all aspects of inventory REST processing.
        /// </summary>

        private void DoInventory(RequestData hdata)
        {

            InventoryRequestData rdata = (InventoryRequestData) hdata;

            Rest.Log.DebugFormat("{0} DoInventory ENTRY", MsgId);

            // If we're disabled, do nothing.

            if (!enabled)
            {
                return;
            }

            // Now that we know this is a serious attempt to 
            // access inventory data, we should find out who
            // is asking, and make sure they are authorized
            // to do so. We need to validate the caller's
            // identity before revealing anything about the
            // status quo. Authenticate throws an exception
            // via Fail if no identity information is present.
            //
            // With the present HTTP server we can't use the
            // builtin authentication mechanisms because they
            // would be enforced for all in-bound requests.
            // Instead we look at the headers ourselves and 
            // handle authentication directly.
 
            try
            {
                if (!rdata.IsAuthenticated)
                {
                    rdata.Fail(Rest.HttpStatusCodeNotAuthorized, Rest.HttpStatusDescNotAuthorized);
                }
            }
            catch (RestException e)
            {
                if (e.statusCode == Rest.HttpStatusCodeNotAuthorized)
                {
                    Rest.Log.WarnFormat("{0} User not authenticated", MsgId);
                    Rest.Log.DebugFormat("{0} Authorization header: {1}", MsgId, rdata.request.Headers.Get("Authorization"));
                }
                else
                {
                    Rest.Log.ErrorFormat("{0} User authentication failed", MsgId);
                    Rest.Log.DebugFormat("{0} Authorization header: {1}", MsgId, rdata.request.Headers.Get("Authorization"));
                }
                throw (e);
            }

            Rest.Log.DebugFormat("{0} Authenticated {1}", MsgId, rdata.userName);

            /// <remarks>
            /// We can only get here if we are authorized
            ///
            /// The requestor may have specified an LLUUID or
            /// a conjoined FirstName LastName string. We'll
            /// try both. If we fail with the first, UUID,
            /// attempt, we try the other. As an example, the
            /// URI for a valid inventory request might be:
            ///
            /// http://<host>:<port>/admin/inventory/Arthur Dent
            ///
            /// Indicating that this is an inventory request for
            /// an avatar named Arthur Dent. This is ALl that is
            /// required to designate a GET for an entire 
            /// inventory.
            /// </remarks>

            // Do we have at least a user agent name?

            if (rdata.parameters.Length < 1)
            {
                Rest.Log.WarnFormat("{0} Inventory: No user agent identifier specified", MsgId);
                rdata.Fail(Rest.HttpStatusCodeBadRequest, Rest.HttpStatusDescBadRequest+": No user identity specified");
            }

            // The first parameter MUST be the agent identification, either an LLUUID
            // or a space-separated First-name Last-Name specification.

            try
            {
                rdata.uuid = new LLUUID(rdata.parameters[0]);
                Rest.Log.DebugFormat("{0} LLUUID supplied", MsgId);
                rdata.userProfile = Rest.UserServices.GetUserProfile(rdata.uuid);
            }
            catch
            {
                string[] names = rdata.parameters[0].Split(Rest.CA_SPACE);
                if (names.Length == 2)
                {
                    Rest.Log.DebugFormat("{0} Agent Name supplied [2]", MsgId);
                    rdata.userProfile = Rest.UserServices.GetUserProfile(names[0],names[1]);
                }
                else
                {
                    Rest.Log.DebugFormat("{0} A Valid UUID or both first and last names must be specified", MsgId);
                    rdata.Fail(Rest.HttpStatusCodeBadRequest, Rest.HttpStatusDescBadRequest+": invalid user identity");
                }
            }

            // If the user rpofile is null then either the server is broken, or the
            // user is not known. We always assume the latter case.

            if (rdata.userProfile != null)
            {
                Rest.Log.DebugFormat("{0} Profile obtained for agent {1} {2}", 
                                     MsgId, rdata.userProfile.FirstName, rdata.userProfile.SurName);
            }
            else
            {
                Rest.Log.DebugFormat("{0} No profile for {1}", MsgId, rdata.path);
                rdata.Fail(Rest.HttpStatusCodeNotFound,Rest.HttpStatusDescNotFound+": unrecognized user identity");
            }

            // If we get to here, then we have effectively validated the user's
            // identity. Now we need to get the inventory. If the server does not
            // have the inventory, we reject the request with an appropriate explanation.
            //
            // Note that inventory retrieval is an asynchronous event, we use the rdata
            // class instance as the basis for our synchronization.
            //
            // TODO
            // If something went wrong in inventory processing the thread could stall here
            // indefinitely. There should be a watchdog timer to fail the request if the
            // response is not recieved in a timely fashion.

            rdata.uuid = rdata.userProfile.ID;
            
            if (Rest.InventoryServices.HasInventoryForUser(rdata.uuid))
            {

                rdata.root = Rest.InventoryServices.RequestRootFolder(rdata.uuid);

                Rest.Log.DebugFormat("{0} Inventory Root retrieved for {1} {2}", 
                                     MsgId, rdata.userProfile.FirstName, rdata.userProfile.SurName);

                Rest.InventoryServices.RequestInventoryForUser(rdata.uuid, rdata.GetUserInventory);

                Rest.Log.DebugFormat("{0} Inventory catalog requested for {1} {2}", 
                                     MsgId, rdata.userProfile.FirstName, rdata.userProfile.SurName);

                lock (rdata)
                {
                    if (!rdata.HaveInventory)
                    {
                        Monitor.Wait(rdata);
                    }
                }

                if (rdata.root == null)
                {
                    Rest.Log.DebugFormat("{0} Inventory is not available [1] for agent {1} {2}", 
                                         MsgId, rdata.userProfile.FirstName, rdata.userProfile.SurName);
                    rdata.Fail(Rest.HttpStatusCodeServerError,Rest.HttpStatusDescServerError+": inventory retrieval failed");
                }

            }
            else
            {
                Rest.Log.DebugFormat("{0} Inventory is not available for agent [3] {1} {2}", 
                                     MsgId, rdata.userProfile.FirstName, rdata.userProfile.SurName);
                rdata.Fail(Rest.HttpStatusCodeNotFound,Rest.HttpStatusDescNotFound+": no inventory for user");
            }

            // If we get here, then we have successfully retrieved the user's information
            // and inventory information is now available locally.

            switch (rdata.method)
            {

            case Rest.HEAD   : // Do the processing, set the status code, suppress entity
                DoGet(rdata);
                rdata.buffer = null;
                break;

            case Rest.GET    : // Do the processing, set the status code, return entity
                DoGet(rdata);
                break;

            case Rest.PUT    : // Add new information
                DoPut(rdata);
                break;

            case Rest.POST   : // Update (replace)
                DoPost(rdata);
                break;

            case Rest.DELETE : // Delete information
                DoDelete(rdata);
                break;

            default :
                Rest.Log.DebugFormat("{0} Method {1} not supported for {2}", 
                                     MsgId, rdata.method, rdata.path);
                rdata.Fail(Rest.HttpStatusCodeMethodNotAllowed,
                           Rest.HttpStatusDescMethodNotAllowed+": "+rdata.method+" not supported");
                break;        
            }

        }

        #endregion Interface

        #region method-specific processing

        /// <summary>
        /// This method implements GET processing for inventory.
        /// Any remaining parameters are used to locate the
        /// corresponding subtree based upon node name.
        /// </summary>

        private void DoGet(InventoryRequestData rdata)
        {

            rdata.initXmlWriter();

            rdata.writer.WriteStartElement(String.Empty,"Inventory",String.Empty);

            // If there was only one parameter, then the entire 
            // inventory is being requested.

            if (rdata.parameters.Length == 1)
            {
                formatInventory(rdata, rdata.root, String.Empty);
            }

            // If there are additional parameters, then these represent
            // a path relative to the root of the inventory. This path
            // must be traversed before we format the sub-tree thus 
            // identified.

            else
            {
                traverseInventory(rdata, rdata.root, 1);
            }

            rdata.writer.WriteFullEndElement();

            rdata.Complete();
            rdata.Respond("Inventory " + rdata.method + ": Normal completion");

        }
    
        /// <summary>
        /// In the case of the inventory, and probably in general,
        /// the distinction between PUT and POST is not always
        /// easy to discern. Adding a directory can be viewed as
        /// an addition, or as a modification to the inventory as
        /// a whole. This is exacerbated by a lack of consistency
        /// across different implementations.
        ///
        /// For OpenSim POST is an update and PUT is an addition.
        ///
        /// The best way to exaplain the distinction is to
        /// consider the relationship between the URI and the
        /// entity in question. For POST, the URI identifies the
        /// entity to be modified or replaced. 
        /// If the operation is PUT,then the URI describes the 
        /// context into which the new entity will be added.
        ///
        /// As an example, suppose the URI contains:
        ///      /admin/inventory/Clothing
        ///
        /// A POST request will result in some modification of
        /// the folder or item named "Clothing". Whereas a PUT 
        /// request will add some new information into the 
        /// content identified by Clothing. It follows from this
        /// that for PUT, the element identified by the URI must
        /// be a folder.
        /// </summary>

        /// <summary>
        /// PUT adds new information to the inventory in the 
        /// context identified by the URI.
        /// </summary>

        private void DoPut(InventoryRequestData rdata)
        {

            // Resolve the context node specified in the URI. Entity
            // data will be ADDED beneath this node.

            Object InventoryNode = getInventoryNode(rdata, rdata.root, 1);

            // Processing depends upon the type of inventory node
            // identified in the URI. This is the CONTEXT for the
            // change. We either got a context or we threw an 
            // exception.

            // It follows that we can only add information if the URI
            // has identified a folder. So only a type of folder is supported 
            // in this case.

            if (typeof(InventoryFolderBase) == InventoryNode.GetType() ||
                typeof(InventoryFolderImpl) == InventoryNode.GetType())
            {

                // Cast the context node appropriately.

                InventoryFolderBase context    = (InventoryFolderBase) InventoryNode;

                Rest.Log.DebugFormat("{0} {1}: Resource(s) will be added to folder {2}",
                                     MsgId, rdata.method, rdata.path);

                // Reconstitute the inventory sub-tree from the XML supplied in the entity.
                // The result is a stand-alone inventory subtree, not yet integrated into the
                // existing tree. An inventory collection consists of three components:
                // [1] A (possibly empty) set of folders.
                // [2] A (possibly empty) set of items.
                // [3] A (possibly empty) set of assets.
                // If all of these are empty, then the PUT is a harmless no-operation.

                XmlInventoryCollection entity  = ReconstituteEntity(rdata);

                // Inlined assets can be included in entity. These must be incorporated into
                // the asset database before we attempt to update the inventory. If anything 
                // fails, return a failure to requestor.

                if (entity.Assets.Count > 0)
                {

                    Rest.Log.DebugFormat("{0} Adding {1} assets to server",
                                         MsgId, entity.Assets.Count);

                    foreach (AssetBase asset in entity.Assets)
                    {
                        Rest.Log.DebugFormat("{0} Rest asset: {1} {2} {3}",
                                             MsgId, asset.ID, asset.Type, asset.Name);
                        Rest.AssetServices.AddAsset(asset);

                        if (Rest.DumpAsset)
                        {
                            Rest.Dump(asset.Data);
                        }

                    }

                }

                // Modify the context using the collection of folders and items
                // returned in the XmlInventoryCollection.

                foreach (InventoryFolderBase folder in entity.Folders)
                {

                    InventoryFolderBase found;

                    // If the parentID is zero, then this folder is going
                    // into the root folder identified by the URI. The requestor
                    // may have already set the parent ID explicitly, in which
                    // case we don't have to do it here.

                    if (folder.ParentID == LLUUID.Zero)
                    {
                        folder.ParentID = context.ID;
                    }

                    // Search the existing inventory for an existing entry. If
                    // we have one, we need to decide if it has really changed.
                    // It could just be present as (unnecessary) context, and we
                    // don't want to waste time updating the database in that
                    // case, OR, it could be being moved from another location
                    // in which case an update is most certainly necessary.

                    found = null;

                    foreach (InventoryFolderBase xf in rdata.folders)
                    {
                        // Compare identifying attribute
                        if (xf.ID == folder.ID)
                        {
                            found = xf;
                            break;
                        }
                    }

                    if (found != null && FolderHasChanged(folder,found))
                    {
                        Rest.Log.DebugFormat("{0} Updating existing folder", MsgId);
                        Rest.InventoryServices.MoveFolder(folder);
                    }
                    else
                    {
                        Rest.Log.DebugFormat("{0} Adding new folder", MsgId);
                        Rest.InventoryServices.AddFolder(folder);
                    }

                }

                // Now we repeat a similar process for the items included
                // in the entity.

                foreach (InventoryItemBase item in entity.Items)
                {

                    InventoryItemBase found = null;

                    // If the parentID is zero, then this is going
                    // directly into the root identified by the URI.

                    if (item.Folder == LLUUID.Zero)
                    {
                        item.Folder = context.ID;
                    }

                    // Determine whether this is a new item or a 
                    // replacement definition.

                    foreach (InventoryItemBase xi in rdata.items)
                    {
                        // Compare identifying attribute
                        if (xi.ID == item.ID)
                        {
                            found = xi;
                            break;
                        }
                    }

                    if (found != null && ItemHasChanged(item, found))
                    {
                        Rest.Log.DebugFormat("{0} Updating item {1} {2} {3} {4} {5}",
                                             MsgId, item.ID, item.AssetID, item.InvType, item.AssetType, item.Name);
                        Rest.InventoryServices.UpdateItem(item);
                    }
                    else
                    {
                        Rest.Log.DebugFormat("{0} Adding item {1} {2} {3} {4} {5}",
                                             MsgId, item.ID, item.AssetID, item.InvType, item.AssetType, item.Name);
                        Rest.InventoryServices.AddItem(item);
                    }

                }

            }
            else
            {
                Rest.Log.DebugFormat("{0} {1}: Resource {2} is not a valid context: {3}",
                                     MsgId, rdata.method, rdata.path, InventoryNode.GetType());
                rdata.Fail(Rest.HttpStatusCodeBadRequest,
                           Rest.HttpStatusDescBadRequest+": invalid resource context");
            }

            rdata.Complete();
            rdata.Respond("Inventory " + rdata.method + ": Normal completion");

        }

        /// <summary>
        /// POST updates the URI-identified element in the inventory. This
        /// is actually far more flexible than it might at first sound. For
        /// POST the URI serves two purposes:
        ///     [1] It identifies the user whose inventory is to be 
        ///         processed.
        ///     [2] It optionally specifies a subtree of the inventory
        ///         that is to be used to resolve any relative subtree 
        ///         specifications in the entity. If nothing is specified
        ///         then the whole inventory is implied.
        /// Please note that the subtree specified by the URI is only relevant
        /// to an entity containing a URI relative specification, i.e. one or
        /// more elements do not specify parent folder information. These 
        /// elements will be implicitly referenced within the context identified
        /// by the URI.
        /// If an element in the entity specifies an explicit parent folder, then
        /// that parent is effective, regardless of any value specified in the
        /// URI. If the parent does not exist, then the element, and any dependent
        /// elements, are ignored. This case is actually detected and handled 
        /// during the reconstitution process.
        /// </summary>

        private void DoPost(InventoryRequestData rdata)
        {

            int count = 0;

            // Resolve the inventory node that is to be modified.

            Object InventoryNode = getInventoryNode(rdata, rdata.root, 1);

            // As long as we have a node, then we have something
            // meaningful to do, unlike PUT. So we reconstitute the 
            // subtree before doing anything else. Note that we 
            // etiher got a valid node or we threw an exception.

            XmlInventoryCollection entity = ReconstituteEntity(rdata);

            // Incorporate any inlined assets first. Any failures
            // will terminate the request.

            if (entity.Assets.Count > 0)
            {
                Rest.Log.DebugFormat("{0} Adding {1} assets to server",
                                     MsgId, entity.Assets.Count);

                foreach (AssetBase asset in entity.Assets)
                {
                    Rest.Log.DebugFormat("{0} Rest asset: {1} {2} {3}",
                                         MsgId, asset.ID, asset.Type, asset.Name);

                    // The asset was validated during the collection process

                    Rest.AssetServices.AddAsset(asset);

                    if (Rest.DumpAsset)
                    {
                        Rest.Dump(asset.Data);
                    }

                }
            }

            /// <summary>
            /// The URI specifies either a folder or an item to be updated.
            /// </summary>
            /// <remarks>
            /// The root node in the entity will replace the node identified
            /// by the URI. This means the parent will remain the same, but 
            /// any or all attributes associated with the named element
            /// will change.
            ///
            /// If the inventory collection contains an element with a zero
            /// parent ID, then this is taken to be the replacement for the 
            /// named node. The collection MAY also specify an explicit 
            /// parent ID, in this case it MAY identify the same parent as
            /// the current node, or it MAY specify a different parent, 
            /// indicating that the folder is being moved in addition to any
            /// other modifications being made.
            /// </remarks>

            if (typeof(InventoryFolderBase) == InventoryNode.GetType() ||
                typeof(InventoryFolderImpl) == InventoryNode.GetType())
            {

                InventoryFolderBase uri = (InventoryFolderBase) InventoryNode;
                InventoryFolderBase xml = null;
                
                // Scan the set of folders in the entity collection for an
                // entry that matches the context folder. It is assumed that
                // the only reliable indicator of this is a zero UUID ( using
                // implicit context), or the parent's UUID matches that of the
                // URI designated node (explicit context). We don't allow
                // ambiguity in this case because this is POST and we are
                // supposed to be modifying a specific node.
                // We assign any element IDs required as an economy; we don't
                // want to iterate over the fodler set again if it can be 
                // helped.

                foreach (InventoryFolderBase folder in entity.Folders)
                {
                    if (folder.ParentID == uri.ParentID ||
                        folder.ParentID == LLUUID.Zero)
                    {
                        folder.ParentID = uri.ParentID;
                        xml = folder;
                        count++;
                    }
                    if (xml.ID == LLUUID.Zero)
                    {
                        xml.ID = LLUUID.Random();
                    }
                }

                // More than one entry is ambiguous. Other folders should be
                // added using the PUT verb.

                if (count > 1)
                {
                    Rest.Log.DebugFormat("{0} {1}: Request for <{2}> is ambiguous",
                                         MsgId, rdata.method, rdata.path);
                    rdata.Fail(Rest.HttpStatusCodeBadRequest, 
                               Rest.HttpStatusDescBadRequest+": context is ambiguous");
                }

                // Exactly one entry means we ARE replacing the node
                // identified by the URI. So we delete the old folder
                // by moving it to the trash and then purging it.
                // We then add all of the folders and items we 
                // included in the entity. The subtree has been
                // modified.

                if (count == 1)
                {

                    InventoryFolderBase TrashCan = GetTrashCan(rdata);

                    uri.ParentID = TrashCan.ID;
                    Rest.InventoryServices.MoveFolder(uri);
                    Rest.InventoryServices.PurgeFolder(TrashCan);

                }

                // Now, regardelss of what they represent, we 
                // integrate all of the elements in the entity.

                foreach (InventoryFolderBase f in entity.Folders)
                {
                    Rest.InventoryServices.MoveFolder(f);
                }

                foreach (InventoryItemBase it in entity.Items)
                {
                    Rest.InventoryServices.AddItem(it);
                }

            }

            /// <summary>
            /// URI specifies an item to be updated
            /// </summary>
            /// <remarks>
            /// The entity must contain a single item node to be
            /// updated. ID and Folder ID must be correct.
            /// </remarks>

            else
            {

                InventoryItemBase uri = (InventoryItemBase) InventoryNode;
                InventoryItemBase xml = null;

                if (entity.Folders.Count != 0)
                {
                    Rest.Log.DebugFormat("{0} {1}: Request should not contain any folders <{2}>",
                                         MsgId, rdata.method, rdata.path);
                    rdata.Fail(Rest.HttpStatusCodeBadRequest, 
                               Rest.HttpStatusDescBadRequest+": folder is not allowed");
                }

                if (entity.Items.Count > 1)
                {
                    Rest.Log.DebugFormat("{0} {1}: Entity contains too many items <{2}>",
                                         MsgId, rdata.method, rdata.path);
                    rdata.Fail(Rest.HttpStatusCodeBadRequest, 
                               Rest.HttpStatusDescBadRequest+": too may items");
                }

                xml = entity.Items[0];
                
                if (xml.ID == LLUUID.Zero)
                {
                    xml.ID = LLUUID.Random();
                }

                // If the folder reference has changed, then this item is
                // being moved. Otherwise we'll just delete the old, and
                // add in the new.

                // Delete the old item

                Rest.InventoryServices.DeleteItem(uri);

                // Add the new item to the inventory

                Rest.InventoryServices.AddItem(xml);

            }

            rdata.Complete();
            rdata.Respond("Inventory " + rdata.method + ": Normal completion");

        }

        /// <summary>
        /// Arguably the most damaging REST interface. It deletes the inventory
        /// item or folder identified by the URI.
        ///
        /// We only process if the URI identified node appears to exist
        /// We do not test for success because we either get a context,
        /// or an exception is thrown.
        ///
        /// Folders are deleted by moving them to another folder and then
        /// purging that folder. We'll do that by creating a temporary
        /// sub-folder in the TrashCan and purging that folder's 
        /// contents. If we can't can it, we don't delete it...
        /// So, if no trashcan is available, the request does nothing.
        /// Items are summarily deleted.
        ///
        /// In the interests of safety, a delete request should normally
        /// be performed using UUID, as a name might identify several
        /// elements.
        /// </summary>

        private void DoDelete(InventoryRequestData rdata)
        {

            Object InventoryNode = getInventoryNode(rdata, rdata.root, 1);

            if (typeof(InventoryFolderBase) == InventoryNode.GetType() ||
                typeof(InventoryFolderImpl) == InventoryNode.GetType())
            {

                InventoryFolderBase TrashCan = GetTrashCan(rdata);

                InventoryFolderBase folder = (InventoryFolderBase) InventoryNode;
                Rest.Log.DebugFormat("{0} {1}: Folder {2} will be deleted",
                                     MsgId, rdata.method, rdata.path);
                folder.ParentID = TrashCan.ID;
                Rest.InventoryServices.MoveFolder(folder);
                Rest.InventoryServices.PurgeFolder(TrashCan);

            }

            // Deleting items is much more straight forward.

            else
            {
                InventoryItemBase item = (InventoryItemBase) InventoryNode;
                Rest.Log.DebugFormat("{0} {1}: Item {2} will be deleted",
                                     MsgId, rdata.method, rdata.path);
                Rest.InventoryServices.DeleteItem(item);
            }

            rdata.Complete();
            rdata.Respond("Inventory " + rdata.method + ": Normal completion");

        }

#endregion method-specific processing

        /// <summary>
        /// This method is called to obtain the OpenSim inventory object identified
        /// by the supplied URI. This may be either an Item or a Folder, so a suitably
        /// ambiguous return type is employed (Object). This method recurses as 
        /// necessary to process the designated hierarchy.
        /// 
        /// If we reach the end of the URI then we return the contextural folder to 
        /// our caller.
        ///
        /// If we are not yet at the end of the URI we attempt to find a child folder
        /// and if we succeed we recurse.
        ///
        /// If this is the last node, then we look to see if this is an item. If it is,
        /// we return that item.
        ///
        /// Otherwise we fail the request on the ground of an invalid URI.
        ///
        /// <note>
        /// This mechanism cannot detect the case where duplicate subtrees satisfy a 
        /// request. In such a case the 1st element gets processed. If this is a 
        /// problem, then UUID should be used to identify the end-node. This is basic
        /// premise of normal inventory processing. The name is an informational, and
        /// not a defining, attribute.
        /// </note>
        ///
        /// </summary>

        private Object getInventoryNode(InventoryRequestData rdata, InventoryFolderBase folder, int pi)
        {

            Rest.Log.DebugFormat("{0} Searching folder {1} {2} [{3}]", MsgId, folder.ID, folder.Name, pi);

            // We have just run off the end of the parameter sequence

            if (pi >= rdata.parameters.Length)
            {
                return folder;
            }

            // More names in the sequence, look for a folder that might
            // get us there.

            if (rdata.folders != null)
                foreach (InventoryFolderBase f in rdata.folders)
                {
                    // Look for the present node in the directory list
                    if (f.ParentID == folder.ID && 
                        (f.Name == rdata.parameters[pi] ||
                         f.ID.ToString() == rdata.parameters[pi]))
                    {
                        return getInventoryNode(rdata, f, pi+1);
                    }
                }
            
            // No folders that match. Perhaps this parameter identifies an item? If
            // it does, then it MUST also be the last name in the sequence.

            if (pi == rdata.parameters.Length-1)
            {
                if (rdata.items != null)
                {
                    int k = 0;
                    InventoryItemBase li = null;
                    foreach (InventoryItemBase i in rdata.items)
                    {
                        if (i.Folder == folder.ID && 
                            (i.Name == rdata.parameters[pi] ||
                             i.ID.ToString() == rdata.parameters[pi]))
                        {
                            li = i;
                            k++;
                        }
                    }
                    if (k == 1)
                    {
                        return li;
                    }
                    else
                    {
                        Rest.Log.DebugFormat("{0} {1}: Request for {2} is ambiguous",
                                             MsgId, rdata.method, rdata.path);
                        rdata.Fail(Rest.HttpStatusCodeNotFound, Rest.HttpStatusDescNotFound+": request is ambiguous");
                    }
                }
            }

            // No, so abandon the request

            Rest.Log.DebugFormat("{0} {1}: Resource {2} not found",
                                 MsgId, rdata.method, rdata.path);
            rdata.Fail(Rest.HttpStatusCodeNotFound, Rest.HttpStatusDescNotFound+": resource "+rdata.path+" not found");

            return null; /* Never reached */

        }

        /// <summary>
        /// This routine traverse the inventory's structure until the end-point identified 
        /// in the URI is reached, the remainder of the inventory (if any) is then formatted
        /// and returned to the requestor.
        ///
        /// Note that this method is only interested in those folder that match elements of
        /// the URI supplied by the requestor, so once a match is fund, the processing does
        /// not need to consider any further elements.
        ///
        /// Only the last element in the URI should identify an item.
        /// </summary>

        private void traverseInventory(InventoryRequestData rdata, InventoryFolderBase folder, int pi)
        {

            Rest.Log.DebugFormat("{0} Folder : {1} {2} [{3}]", MsgId, folder.ID, folder.Name, pi);

            if (rdata.folders != null)
            {
                foreach (InventoryFolderBase f in rdata.folders)
                {
                    if (f.ParentID == folder.ID && 
                        (f.Name == rdata.parameters[pi] ||
                         f.ID.ToString() == rdata.parameters[pi]))
                    {
                        if (pi < rdata.parameters.Length-1)
                        {
                            traverseInventory(rdata, f, pi+1);
                        }
                        else
                        {
                            formatInventory(rdata, f, String.Empty);
                        }
                        return;
                    }
                }
            }

            if (pi == rdata.parameters.Length-1)
            {
                if (rdata.items != null)
                {
                    foreach (InventoryItemBase i in rdata.items)
                    {
                        if (i.Folder == folder.ID && 
                            (i.Name == rdata.parameters[pi] ||
                             i.ID.ToString() == rdata.parameters[pi]))
                        {
                            // Fetching an Item has a special significance. In this
                            // case we also want to fetch the associated asset.
                            // To make it interesting, we'll d this via redirection. 
                            string asseturl = "http://" + rdata.hostname + ":" + rdata.port +
                                "/admin/assets" + Rest.UrlPathSeparator + i.AssetID.ToString();
                            rdata.Redirect(asseturl,Rest.PERMANENT);
                            Rest.Log.DebugFormat("{0} Never Reached");
                        }
                    }
                }
            }

            Rest.Log.DebugFormat("{0} Inventory does not contain item/folder: <{1}>", 
                                 MsgId, rdata.path);
            rdata.Fail(Rest.HttpStatusCodeNotFound,Rest.HttpStatusDescNotFound+": no such item/folder");

        }

        /// <summary>
        /// This method generates XML that describes an instance of InventoryFolderBase.
        /// It recurses as necessary to reflect a folder hierarchy, and calls formatItem
        /// to generate XML for any items encountered along the way.
        /// The indentation parameter is solely for the benefit of trace record
        /// formatting.
        /// </summary>

        private void formatInventory(InventoryRequestData rdata, InventoryFolderBase folder, string indent)
        {

            if (Rest.DEBUG)
            {
                Rest.Log.DebugFormat("{0} Folder : {1} {2} {3}", MsgId, folder.ID, indent, folder.Name);
                indent += "\t";
            }

            // Start folder item

            rdata.writer.WriteStartElement(String.Empty,"Folder",String.Empty);
            rdata.writer.WriteAttributeString("name",String.Empty,folder.Name);
            rdata.writer.WriteAttributeString("uuid",String.Empty,folder.ID.ToString());
            rdata.writer.WriteAttributeString("owner",String.Empty,folder.Owner.ToString());
            rdata.writer.WriteAttributeString("type",String.Empty,folder.Type.ToString());
            rdata.writer.WriteAttributeString("version",String.Empty,folder.Version.ToString());

            if (rdata.folders != null)
            {
                foreach (InventoryFolderBase f in rdata.folders)
                {
                    if (f.ParentID == folder.ID)
                    {
                        formatInventory(rdata, f, indent);
                    }
                }
            }

            if (rdata.items != null)
            {
                foreach (InventoryItemBase i in rdata.items)
                {
                    if (i.Folder == folder.ID)
                    {
                        formatItem(rdata, i, indent);
                    }
                }
            }

            // End folder item

            rdata.writer.WriteEndElement();

        }

        /// <summary>
        /// This method generates XML that describes an instance of InventoryItemBase.
        /// </summary>

        private void formatItem(InventoryRequestData rdata, InventoryItemBase i, string indent)
        {

            Rest.Log.DebugFormat("{0}   Item : {1} {2} {3}", MsgId, i.ID, indent, i.Name);

            rdata.writer.WriteStartElement(String.Empty,"Item",String.Empty);

            rdata.writer.WriteAttributeString("name",String.Empty,i.Name);
            rdata.writer.WriteAttributeString("desc",String.Empty,i.Description);
            rdata.writer.WriteAttributeString("uuid",String.Empty,i.ID.ToString());
            rdata.writer.WriteAttributeString("owner",String.Empty,i.Owner.ToString());
            rdata.writer.WriteAttributeString("creator",String.Empty,i.Creator.ToString());
            rdata.writer.WriteAttributeString("creationdate",String.Empty,i.CreationDate.ToString());
            rdata.writer.WriteAttributeString("type",String.Empty,i.InvType.ToString());
            rdata.writer.WriteAttributeString("assettype",String.Empty,i.AssetType.ToString());
            rdata.writer.WriteAttributeString("groupowned",String.Empty,i.GroupOwned.ToString());
            rdata.writer.WriteAttributeString("groupid",String.Empty,i.GroupID.ToString());
            rdata.writer.WriteAttributeString("saletype",String.Empty,i.SaleType.ToString());
            rdata.writer.WriteAttributeString("saleprice",String.Empty,i.SalePrice.ToString());
            rdata.writer.WriteAttributeString("flags",String.Empty,i.Flags.ToString("X"));

            rdata.writer.WriteStartElement(String.Empty,"Permissions",String.Empty);
            rdata.writer.WriteAttributeString("current",String.Empty,i.CurrentPermissions.ToString("X"));
            rdata.writer.WriteAttributeString("next",String.Empty,i.NextPermissions.ToString("X"));
            rdata.writer.WriteAttributeString("everyone",String.Empty,i.EveryOnePermissions.ToString("X"));
            rdata.writer.WriteAttributeString("base",String.Empty,i.BasePermissions.ToString("X"));
            rdata.writer.WriteEndElement();

            rdata.writer.WriteElementString("Asset",i.AssetID.ToString());

            rdata.writer.WriteEndElement();

        }

        /// <summary>
        /// This method creates a "trashcan" folder to support folder and item 
        /// deletions by this interface. The xisting trash folder is found and
        /// this folder is created within it. It is called "tmp" to indicate to
        /// the client that it is OK to delete this folder. The REST interface
        /// will recreate the folder on an as-required basis.
        /// If the trash can cannot be created, then by implication the request
        /// that required it cannot be completed, and it fails accordingly.
        /// </summary>

        private InventoryFolderBase GetTrashCan(InventoryRequestData rdata)
        {

            InventoryFolderBase TrashCan = null;

            foreach (InventoryFolderBase f in rdata.folders)
            {
                if (f.Name == "Trash")
                {
                    foreach (InventoryFolderBase t in rdata.folders)
                    {
                        if (t.Name == "tmp")
                        {
                            TrashCan = t;
                        }
                    }
                    if (TrashCan == null)
                    {
                        TrashCan = new InventoryFolderBase();
                        TrashCan.Name = "tmp";
                        TrashCan.ID   = LLUUID.Random();
                        TrashCan.Version = 1;
                        TrashCan.Type = (short) AssetType.TrashFolder;
                        TrashCan.ParentID = f.ID;
                        TrashCan.Owner = f.Owner;
                        Rest.InventoryServices.AddFolder(TrashCan);
                    }
                }
            }
    
            if (TrashCan == null)
            {
                Rest.Log.DebugFormat("{0} No Trash Can available", MsgId);
                rdata.Fail(Rest.HttpStatusCodeServerError, 
                           Rest.HttpStatusDescServerError+": unable to create trash can");
            }

            return TrashCan;

        }

        /// <summary>
        /// Make sure that an unchanged folder is not unnecessarily
        /// processed.
        /// </summary>

        private bool FolderHasChanged(InventoryFolderBase newf, InventoryFolderBase oldf)
        {
            return ( newf.Name    != oldf.Name
                     || newf.ParentID    != oldf.ParentID 
                     || newf.Owner       != oldf.Owner 
                     || newf.Type        != oldf.Type 
                     || newf.Version     != oldf.Version 
                );
        }

        /// <summary>
        /// Make sure that an unchanged item is not unnecessarily
        /// processed.
        /// </summary>

        private bool ItemHasChanged(InventoryItemBase newf, InventoryItemBase oldf)
        {
            return ( newf.Name    != oldf.Name
                     || newf.Folder      != oldf.Description 
                     || newf.Description != oldf.Description 
                     || newf.Owner       != oldf.Owner 
                     || newf.Creator     != oldf.Creator 
                     || newf.AssetID     != oldf.AssetID 
                     || newf.GroupID     != oldf.GroupID 
                     || newf.GroupOwned  != oldf.GroupOwned 
                     || newf.InvType     != oldf.InvType 
                     || newf.AssetType   != oldf.AssetType 
                );
        }

        /// <summary>
        /// This method is called by PUT and POST to create an XmlInventoryCollection
        /// instance that reflects the content of the entity supplied on the request.
        /// Any elements in the completed collection whose UUID is zero, are 
        /// considered to be located relative to the end-point identified int he 
        /// URI. In this way, an entire sub-tree can be conveyed in a single REST
        /// PUT or POST request.
        ///
        /// A new instance of XmlInventoryCollection is created and, if the request
        /// has an entity, it is more completely initialized. thus, if no entity was
        /// provided the collection is valid, but empty.
        ///
        /// The entity is then scanned and each tag is processed to produce the 
        /// appropriate inventory elements. At the end f the scan, teh XmlInventoryCollection
        /// will reflect the subtree described by the entity.
        ///
        /// This is a very flexible mechanism, the entity may contain arbitrary,
        /// discontiguous tree fragments, or may contain single element. The caller is
        /// responsible for integrating this collection (and ensuring that any 
        /// missing parent IDs are resolved).
        /// </summary>

        internal XmlInventoryCollection ReconstituteEntity(InventoryRequestData rdata)
        {

            Rest.Log.DebugFormat("{0} Reconstituting entity", MsgId);

            XmlInventoryCollection ic = new XmlInventoryCollection();

            if (rdata.request.HasEntityBody)
            {

                Rest.Log.DebugFormat("{0} Entity present", MsgId);

                ic.init(rdata);

                try
                {
                    while (ic.xml.Read())
                    {
                        switch (ic.xml.NodeType)
                        {
                        case XmlNodeType.Element :
                            Rest.Log.DebugFormat("{0} StartElement: <{1}>",
                                                 MsgId, ic.xml.Name);
                            switch (ic.xml.Name)
                            {
                            case "Folder" :
                                Rest.Log.DebugFormat("{0} Processing {1} element",
                                                     MsgId, ic.xml.Name);
                                CollectFolder(ic);
                                break;
                            case "Item"   :
                                Rest.Log.DebugFormat("{0} Processing {1} element",
                                                     MsgId, ic.xml.Name);
                                CollectItem(ic);
                                break;
                            case "Asset"  :
                                Rest.Log.DebugFormat("{0} Processing {1} element",
                                                     MsgId, ic.xml.Name);
                                CollectAsset(ic);
                                break;
                            case "Permissions"  :
                                Rest.Log.DebugFormat("{0} Processing {1} element",
                                                     MsgId, ic.xml.Name);
                                CollectPermissions(ic);
                                break;
                            default :
                                Rest.Log.DebugFormat("{0} Ignoring {1} element",
                                                     MsgId, ic.xml.Name);
                                break;
                            }
                            // This stinks, but the ReadElement call above not only reads
                            // the imbedded data, but also consumes the end tag for Asset
                            // and moves the element pointer on to the containing Item's
                            // element-end, however, if there was a permissions element
                            // following, it would get us to the start of that..
                            if (ic.xml.NodeType == XmlNodeType.EndElement &&
                                ic.xml.Name     == "Item")
                            {
                                Validate(ic);
                            }
                            break;
                        case XmlNodeType.EndElement :
                            switch (ic.xml.Name)
                            {
                            case "Folder" :
                                Rest.Log.DebugFormat("{0} Completing {1} element",
                                                     MsgId, ic.xml.Name);
                                ic.Pop();
                                break;
                            case "Item"   :
                                Rest.Log.DebugFormat("{0} Completing {1} element",
                                                     MsgId, ic.xml.Name);
                                Validate(ic);
                                break;
                            case "Asset"  :
                                Rest.Log.DebugFormat("{0} Completing {1} element",
                                                     MsgId, ic.xml.Name);
                                break;
                            case "Permissions"  :
                                Rest.Log.DebugFormat("{0} Completing {1} element",
                                                     MsgId, ic.xml.Name);
                                break;
                            default :
                                Rest.Log.DebugFormat("{0} Ignoring {1} element",
                                                     MsgId, ic.xml.Name);
                                break;
                            }
                            break;
                        default :
                            Rest.Log.DebugFormat("{0} [0] Ignoring: <{1}>:<2>",
                                                 MsgId, ic.xml.NodeType, ic.xml.Value);
                            break;
                        }
                    }
                }
                catch (XmlException e)
                {
                    Rest.Log.WarnFormat("{0} XML parsing error: {1}", MsgId, e.Message);
                    throw e;
                }
                catch (Exception e)
                {
                    Rest.Log.WarnFormat("{0} Unexpected XML parsing error: {1}", MsgId, e.Message);
                    throw e;
                }
                
            }
            else
            {
                Rest.Log.DebugFormat("{0} Entity absent", MsgId);
            }

            if (Rest.DEBUG)
            {
                Rest.Log.DebugFormat("{0} Reconstituted entity", MsgId);
                Rest.Log.DebugFormat("{0} {1} assets", MsgId, ic.Assets.Count);
                Rest.Log.DebugFormat("{0} {1} folder", MsgId, ic.Folders.Count);
                Rest.Log.DebugFormat("{0} {1} items", MsgId, ic.Items.Count);
            }

            return ic;

        }

        /// <summary>
        /// This method creates an inventory Folder from the
        /// information supplied in the request's entity.
        /// A folder instance is created and initialized to reflect 
        /// default values. These values are then overridden 
        /// by information supplied in the entity.
        /// If context was not explicitly provided, then the
        /// appropriate ID values are determined.
        /// </summary>

        private void CollectFolder(XmlInventoryCollection ic)
        {

            Rest.Log.DebugFormat("{0} Interpret folder element", MsgId);

            InventoryFolderBase result = new InventoryFolderBase();

            // Default values

            result.Name     = String.Empty;
            result.ID       = LLUUID.Zero;
            result.Owner    = ic.UserID;
            result.ParentID = LLUUID.Zero; // Context
            result.Type     = (short) AssetType.Folder;
            result.Version  =  1;

            if (ic.xml.HasAttributes)
            {
                for (int i = 0; i < ic.xml.AttributeCount; i++)
                {
                    ic.xml.MoveToAttribute(i);
                    switch (ic.xml.Name)
                    {
                    case "name" :
                        result.Name     =     ic.xml.Value;
                        break;
                    case "uuid" :
                        result.ID       = new LLUUID(ic.xml.Value);
                        break;
                    case "parent" :
                        result.ParentID = new LLUUID(ic.xml.Value);
                        break;
                    case "owner" :
                        result.Owner    = new LLUUID(ic.xml.Value);
                        break;
                    case "type" :
                        result.Type     =     Int16.Parse(ic.xml.Value);
                        break;
                    case "version" :
                        result.Version  =     UInt16.Parse(ic.xml.Value);
                        break;
                    default :
                        Rest.Log.DebugFormat("{0} Folder: unrecognized attribute: {1}:{2}", 
                                             MsgId, ic.xml.Name, ic.xml.Value);
                        ic.Fail(Rest.HttpStatusCodeBadRequest,
                                Rest.HttpStatusDescBadRequest+": unrecognized attribute");
                        break;
                    }
                }
            }

            ic.xml.MoveToElement();

            // The client is relying upon the reconstitution process
            // to determine the parent's UUID based upon context. This
            // is necessary where a new folder may have been
            // introduced.

            if (result.ParentID == LLUUID.Zero)
            {
                result.ParentID = ic.Parent();
            }
            else
            {

                bool found = false;

                foreach (InventoryFolderBase parent in ic.rdata.folders)
                {
                    if ( parent.ID == result.ParentID )
                    {
                        found = true;
                        break;
                    }
                }

                if (!found)
                {
                    Rest.Log.ErrorFormat("{0} Invalid parent ID ({1}) in folder {2}", 
                                         MsgId, ic.Item.Folder, result.ID);
                    ic.Fail(Rest.HttpStatusCodeBadRequest,
                            Rest.HttpStatusDescBadRequest+": invalid parent");
                }

            }

            // This is a new folder, so no existing UUID is available
            // or appropriate

            if (result.ID == LLUUID.Zero)
            {
                result.ID = LLUUID.Random();
            }

            // Treat this as a new context. Any other information is
            // obsolete as a consequence.

            ic.Push(result);

        }

        /// <summary>
        /// This method is called to handle the construction of an Item
        /// instance from the supplied request entity. It is called 
        /// whenever an Item start tag is detected.
        /// An instance of an Item is created and initialized to default
        /// values. These values are then overridden from values supplied 
        /// as attributes to the Item element.
        /// This item is then stored in the XmlInventoryCollection and
        /// will be verified by Validate.
        /// All context is reset whenever the effective folder changes
        /// or an item is successfully validated.
        /// </summary>

        private void CollectItem(XmlInventoryCollection ic)
        {

            Rest.Log.DebugFormat("{0} Interpret item element", MsgId);

            InventoryItemBase result = new InventoryItemBase();

            result.Name        = String.Empty;
            result.Description = String.Empty;
            result.ID          = LLUUID.Zero;
            result.Folder      = LLUUID.Zero;
            result.Owner       = ic.UserID;
            result.Creator     = ic.UserID;
            result.AssetID     = LLUUID.Zero;
            result.GroupID     = LLUUID.Zero;
            result.GroupOwned  = false;
            result.InvType     = (int) InventoryType.Unknown;
            result.AssetType   = (int) AssetType.Unknown;

            if (ic.xml.HasAttributes)
            {
                for (int i = 0; i < ic.xml.AttributeCount; i++)
                {

                    ic.xml.MoveToAttribute(i);

                    switch (ic.xml.Name)
                    {
                    case "name" :
                        result.Name         = ic.xml.Value;
                        break;
                    case "desc" :
                        result.Description  = ic.xml.Value;
                        break;
                    case "uuid" :
                        result.ID           = new LLUUID(ic.xml.Value);
                        break;
                    case "folder" :
                        result.Folder       = new LLUUID(ic.xml.Value);
                        break;
                    case "owner" :
                        result.Owner        = new LLUUID(ic.xml.Value);
                        break;
                    case "invtype" :
                        result.InvType      =     Int32.Parse(ic.xml.Value);
                        break;
                    case "creator" :
                        result.Creator      = new LLUUID(ic.xml.Value);
                        break;
                    case "assettype" :
                        result.AssetType    =     Int32.Parse(ic.xml.Value);
                        break;
                    case "groupowned" :
                        result.GroupOwned   =     Boolean.Parse(ic.xml.Value);
                        break;
                    case "groupid" :
                        result.GroupID      = new LLUUID(ic.xml.Value);
                        break;
                    case "flags" :
                        result.Flags        =     UInt32.Parse(ic.xml.Value);
                        break;
                    case "creationdate" :
                        result.CreationDate =     Int32.Parse(ic.xml.Value);
                        break;
                    case "saletype" :
                        result.SaleType     =     Byte.Parse(ic.xml.Value);
                        break;
                    case "saleprice" :
                        result.SalePrice    =     Int32.Parse(ic.xml.Value);
                        break;

                    default :
                        Rest.Log.DebugFormat("{0} Item: Unrecognized attribute: {1}:{2}", 
                                             MsgId, ic.xml.Name, ic.xml.Value);
                        ic.Fail(Rest.HttpStatusCodeBadRequest,
                                Rest.HttpStatusDescBadRequest+": unrecognized attribute");
                        break;
                    }
                }
            }   
                
            ic.xml.MoveToElement();

            ic.Push(result);

        }

        /// <summary>
        /// This method assembles an asset instance from the 
        /// information supplied in the request's entity. It is 
        /// called as a result of detecting a start tag for a 
        /// type of Asset.
        /// The information is collected locally, and an asset
        /// instance is created only if the basic XML parsing
        /// completes successfully.
        /// Default values for all parts of the asset are 
        /// established before overriding them from the supplied
        /// XML.
        /// If an asset has inline=true as an attribute, then
        /// the element contains the data representing the
        /// asset. This is saved as the data component.
        /// inline=false means that the element's payload is
        /// simply the UUID of the asset referenced by the 
        /// item being constructed.
        /// An asset, if created is stored in the
        /// XmlInventoryCollection
        /// </summary>

        private void CollectAsset(XmlInventoryCollection ic)
        {
            Rest.Log.DebugFormat("{0} Interpret asset element", MsgId);

            AssetBase asset = null;

            string    name  = String.Empty;
            string    desc  = String.Empty;
            sbyte     type  = (sbyte) AssetType.Unknown;
            bool      temp  = false;
            bool     local  = false;

            // This is not a persistent attribute
            bool    inline  = true;

            LLUUID    uuid  = LLUUID.Zero;

            // Attribute is optional
            if (ic.xml.HasAttributes)
            {
                for (int i = 0; i < ic.xml.AttributeCount; i++)
                {
                    ic.xml.MoveToAttribute(i);
                    switch (ic.xml.Name)
                    {

                    case "name" :
                        name = ic.xml.Value;
                        break;

                    case "type" :
                        type = SByte.Parse(ic.xml.Value);
                        break;

                    case "description" :
                        desc = ic.xml.Value;
                        break;

                    case "temporary" :
                        temp = Boolean.Parse(ic.xml.Value);
                        break;

                    case "uuid" :
                        uuid = new LLUUID(ic.xml.Value);
                        break;

                    case "inline" :
                        inline = Boolean.Parse(ic.xml.Value);
                        break;

                    case "local" :
                        local = Boolean.Parse(ic.xml.Value);
                        break;

                    default :
                        Rest.Log.DebugFormat("{0} Asset: Unrecognized attribute: {1}:{2}", 
                                             MsgId, ic.xml.Name, ic.xml.Value);
                        ic.Fail(Rest.HttpStatusCodeBadRequest,
                                Rest.HttpStatusDescBadRequest);
                        break;
                    }
                }
            }

            ic.xml.MoveToElement();

            // If this is a reference to an existing asset, just store the
            // asset ID into the item.
            
            if (!inline)
            {
                if (ic.Item != null)
                {
                    ic.Item.AssetID = new LLUUID(ic.xml.ReadElementContentAsString());
                    Rest.Log.DebugFormat("{0} Asset ID supplied: {1}", MsgId, ic.Item.AssetID);
                }
                else
                {
                    Rest.Log.DebugFormat("{0} LLUID unimbedded asset must be inline", MsgId);
                    ic.Fail(Rest.HttpStatusCodeBadRequest,
                            Rest.HttpStatusDescBadRequest+": no context for asset");
                }
            }

            // Otherwise, generate an asset ID, store that into the item, and 
            // create an entry in the asset list for the inlined asset. But
            // only if the size is non-zero.

            else
            {

                string b64string = null;

                // Generate a UUID of none were given, and generally none should
                // be. Ever.

                if (uuid == LLUUID.Zero)
                {
                    uuid = LLUUID.Random();
                }

                // Create AssetBase entity to hold the inlined asset

                asset = new AssetBase(uuid, name);                                

                asset.Description = desc;
                asset.Type        = type; // type == 0 == texture
                asset.Local       = local;
                asset.Temporary   = temp;
                
                b64string         = ic.xml.ReadElementContentAsString();

                Rest.Log.DebugFormat("{0} Data length is {1}", MsgId, b64string.Length);
                Rest.Log.DebugFormat("{0} Data content starts with: \n\t<{1}>", MsgId, 
                                     b64string.Substring(0, b64string.Length > 132 ? 132 : b64string.Length));

                asset.Data        = Convert.FromBase64String(b64string);

                // Ensure the asset always has some kind of data component

                if (asset.Data == null)
                {
                    asset.Data = new byte[1];
                }

                // If this is in the context of an item, establish
                // a link with the item in context.

                if (ic.Item != null && ic.Item.AssetID == LLUUID.Zero)
                {
                    ic.Item.AssetID = uuid;
                }

            }

            ic.Push(asset);

        }

        /// <summary>
        /// Store any permissions information provided by the request.
        /// This overrides the default permissions set when the 
        /// XmlInventoryCollection object was created.
        /// </summary>

        private void CollectPermissions(XmlInventoryCollection ic)
        {

            if (ic.xml.HasAttributes)
            {
                for (int i = 0; i < ic.xml.AttributeCount; i++)
                {
                    ic.xml.MoveToAttribute(i);
                    switch (ic.xml.Name)
                    {
                    case "current" :
                        ic.CurrentPermissions  = UInt32.Parse(ic.xml.Value, System.Globalization.NumberStyles.HexNumber);
                        break;
                    case "next" :
                        ic.NextPermissions     = UInt32.Parse(ic.xml.Value, System.Globalization.NumberStyles.HexNumber);
                        break;
                    case "everyone" :
                        ic.EveryOnePermissions = UInt32.Parse(ic.xml.Value, System.Globalization.NumberStyles.HexNumber);
                        break;
                    case "base" :
                        ic.BasePermissions     = UInt32.Parse(ic.xml.Value, System.Globalization.NumberStyles.HexNumber);
                        break;
                    default :
                        Rest.Log.DebugFormat("{0} Permissions:  invalid attribute {1}:{2}",
                                             MsgId,ic.xml.Name, ic.xml.Value);
                        ic.Fail(Rest.HttpStatusCodeBadRequest,
                                Rest.HttpStatusDescBadRequest);
                        break;
                    }
                }
            }

            ic.xml.MoveToElement();

        }

        /// <summary>
        /// This method is called whenever an Item has been successfully
        /// reconstituted from the request's entity.
        /// It uses the information curren tin the XmlInventoryCollection
        /// to complete the item's specification, including any implied
        /// context and asset associations.
        /// It fails the request if any necessary item or asset information
        /// is missing.
        /// </summary>

        private void Validate(XmlInventoryCollection ic)
        {

            // There really should be an item present if we've
            // called validate. So fail if there is not.

            if (ic.Item == null)
            {
                Rest.Log.ErrorFormat("{0} Unable to parse request", MsgId);
                ic.Fail(Rest.HttpStatusCodeBadRequest,
                        Rest.HttpStatusDescBadRequest+": request parse error");
            }
 
            // Every item is required to have a name (via REST anyway)

            if (ic.Item.Name == String.Empty)
            {
                Rest.Log.ErrorFormat("{0} An item name MUST be specified", MsgId);
                ic.Fail(Rest.HttpStatusCodeBadRequest,
                        Rest.HttpStatusDescBadRequest+": item name required");
            }
 
            // An item MUST have an asset ID. AssetID should never be zero 
            // here. It should always get set from the information stored
            // when the Asset element was processed.

            if (ic.Item.AssetID == LLUUID.Zero)
            {

                Rest.Log.ErrorFormat("{0} Unable to complete request", MsgId);
                Rest.Log.InfoFormat("{0} Asset information is missing", MsgId);
                ic.Fail(Rest.HttpStatusCodeBadRequest,
                        Rest.HttpStatusDescBadRequest+": asset information required");

            }

            // If the item is new, then assign it an ID

            if (ic.Item.ID == LLUUID.Zero)
            {
                ic.Item.ID = LLUUID.Random();
            }

            // If the context is being implied, obtain the current
            // folder item's ID. If it was specified explicitly, make
            // sure that theparent folder exists.
 
            if (ic.Item.Folder == LLUUID.Zero)
            {
                ic.Item.Folder = ic.Parent();
            }
            else
            {

                bool found = false;

                foreach (InventoryFolderBase parent in ic.rdata.folders)
                {
                    if ( parent.ID == ic.Item.Folder )
                    {
                        found = true;
                        break;
                    }
                }

                if (!found)
                {
                    Rest.Log.ErrorFormat("{0} Invalid parent ID ({1}) in item {2}", 
                                         MsgId, ic.Item.Folder, ic.Item.ID);
                    ic.Fail(Rest.HttpStatusCodeBadRequest,
                            Rest.HttpStatusDescBadRequest+": parent information required");
                }

            }

            // If this is an inline asset being constructed in the context
            // of a new Item, then use the itm's name here too.

            if (ic.Asset != null)
            {
                if (ic.Asset.Name == String.Empty)
                    ic.Asset.Name = ic.Item.Name;
                if (ic.Asset.Description == String.Empty)
                    ic.Asset.Description = ic.Item.Description;
            }

            // Assign permissions

            ic.Item.CurrentPermissions  = ic.CurrentPermissions;
            ic.Item.EveryOnePermissions = ic.EveryOnePermissions;
            ic.Item.BasePermissions     = ic.BasePermissions;
            ic.Item.NextPermissions     = ic.NextPermissions;

            // If no type was specified for this item, we can attempt to
            // infer something from the file type maybe. This is NOT as 
            // good as having type be specified in the XML.

            if (ic.Item.AssetType == (int) AssetType.Unknown ||
                ic.Item.InvType   == (int) AssetType.Unknown)
            {

                Rest.Log.DebugFormat("{0} Attempting to infer item type", MsgId);

                string[] parts = ic.Item.Name.Split(Rest.CA_PERIOD);

                if (Rest.DEBUG)
                {
                    for (int i = 0; i < parts.Length; i++)
                    {
                        Rest.Log.DebugFormat("{0} Name part {1} : {2}",
                                             MsgId, i, parts[i]);
                    }
                }

                // If the associated item name is multi-part, then maybe
                // the last part will indicate the item type - if we're
                // lucky.

                if (parts.Length > 1)
                {
                    Rest.Log.DebugFormat("{0} File type is {1}", 
                                         MsgId, parts[parts.Length - 1]);
                    switch (parts[parts.Length - 1])
                    {
                    case "jpeg2000" :
                    case "jpeg-2000" :
                    case "jpg2000" :
                    case "jpg-2000" :
                        Rest.Log.DebugFormat("{0} Type {1} inferred", 
                                             MsgId, parts[parts.Length-1]);
                        if (ic.Item.AssetType == (int) AssetType.Unknown)
                            ic.Item.AssetType = (int) AssetType.ImageJPEG;
                        if (ic.Item.InvType == (int) AssetType.Unknown)
                            ic.Item.InvType   = (int) AssetType.ImageJPEG;
                        break;
                    case "jpg" :
                    case "jpeg" :
                        Rest.Log.DebugFormat("{0} Type {1} inferred", 
                                             MsgId, parts[parts.Length - 1]);
                        if (ic.Item.AssetType == (int) AssetType.Unknown)
                            ic.Item.AssetType = (int) AssetType.ImageJPEG;
                        if (ic.Item.InvType == (int) AssetType.Unknown)
                            ic.Item.InvType   = (int) AssetType.ImageJPEG;
                        break;
                    case "tga" :
                        if (parts[parts.Length - 2].IndexOf("_texture") != -1)
                        {
                            if (ic.Item.AssetType == (int) AssetType.Unknown)
                                ic.Item.AssetType = (int) AssetType.TextureTGA;
                            if (ic.Item.InvType == (int) AssetType.Unknown)
                                ic.Item.InvType   = (int) AssetType.TextureTGA;
                        }
                        else
                        {
                            if (ic.Item.AssetType == (int) AssetType.Unknown)
                                ic.Item.AssetType = (int) AssetType.ImageTGA;
                            if (ic.Item.InvType == (int) AssetType.Unknown)
                                ic.Item.InvType   = (int) AssetType.ImageTGA;
                        }
                        break;
                    default :
                        Rest.Log.DebugFormat("{0} Type was not inferred", MsgId);
                        break;
                    }
                }
            }

            /// If this is a TGA remember the fact

            if (ic.Item.AssetType == (int) AssetType.TextureTGA ||
               ic.Item.AssetType == (int) AssetType.ImageTGA)
            {
                // TODO: DO we need to convert it? Or is it enough to flag
                // it appropriately?
            }
 
            ic.reset();

        }

        #region Inventory RequestData extension

        internal class InventoryRequestData : RequestData
        {

            /// <summary>
            /// These are the inventory specific request/response state
            /// extensions.
            /// </summary>

            internal bool                       HaveInventory = false;
            internal ICollection<InventoryFolderImpl> folders = null;
            internal ICollection<InventoryItemBase>     items = null;
            internal UserProfileData              userProfile = null;
            internal InventoryFolderBase                 root = null;

            internal InventoryRequestData(OSHttpRequest request, OSHttpResponse response, string prefix)
                : base(request, response, prefix)
            {
            }

            /// <summary>
            /// This is the callback method required by inventory services. The 
            /// requestor issues an inventory request and then blocks until this
            /// method signals the monitor.
            /// </summary>

            internal void GetUserInventory(ICollection<InventoryFolderImpl> folders, ICollection<InventoryItemBase> items)
            {
                Rest.Log.DebugFormat("{0} Asynchronously updating inventory data", MsgId);
                this.folders = folders;
                this.items   = items;
                this.HaveInventory = true;
                lock (this)
                {
                    Monitor.Pulse(this);
                }
            }

        }

        #endregion Inventory RequestData extension

        /// <summary>
        /// This class is used to record and manage the hierarchy
        /// constructed from the entity supplied in the request for
        /// PUT and POST.
        /// </summary>

        internal class XmlInventoryCollection : InventoryCollection
        {

            internal InventoryRequestData       rdata;
            private  Stack<InventoryFolderBase> stk;

            internal List<AssetBase>            Assets;

            internal InventoryItemBase          Item;
            internal AssetBase                  Asset;
            internal XmlReader                  xml;

            internal /*static*/ const uint DefaultCurrent  = 0x7FFFFFFF;
            internal /*static*/ const uint DefaultNext     = 0x82000;
            internal /*static*/ const uint DefaultBase     = 0x7FFFFFFF;
            internal /*static*/ const uint DefaultEveryOne = 0x0;

            internal uint      CurrentPermissions  = 0x00;
            internal uint      NextPermissions     = 0x00;
            internal uint      BasePermissions     = 0x00;
            internal uint      EveryOnePermissions = 0x00;

            internal XmlInventoryCollection()
            {
                Folders = new List<InventoryFolderBase>();
                Items   = new List<InventoryItemBase>();
                Assets  = new List<AssetBase>();
            }

            internal void init(InventoryRequestData p_rdata)
            {
                rdata   = p_rdata;
                UserID  = rdata.uuid;
                stk     = new Stack<InventoryFolderBase>();
                rdata.initXmlReader();
                xml     = rdata.reader;
                initPermissions();
            }

            internal void initPermissions()
            {
                CurrentPermissions  = DefaultCurrent;
                NextPermissions     = DefaultNext;
                BasePermissions     = DefaultBase;
                EveryOnePermissions = DefaultEveryOne;
            }

            internal LLUUID Parent()
            {
                if (stk.Count != 0)
                {
                    return stk.Peek().ID;
                }
                else
                {
                    return LLUUID.Zero;
                }
            }

            internal void Push(InventoryFolderBase folder)
            {
                stk.Push(folder);
                Folders.Add(folder);
                reset();
            }

            internal void Push(InventoryItemBase item)
            {
                Item = item;
                Items.Add(item);
            }

            internal void Push(AssetBase asset)
            {
                Asset = asset;
                Assets.Add(asset);
            }

            internal void Pop()
            {
                stk.Pop();
                reset();
            }

            internal void reset()
            {
                Item  = null;
                Asset = null;
                initPermissions();
            }

            internal void Fail(int code, string desc)
            {
                rdata.Fail(code, desc);
            }

        }
    }
}