restconf/sal-rest-connector/src/main/java/org/opendaylight/netconf/sal/rest/impl/JsonToPATCHBodyReader.java

   1 /*
   2  * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.netconf.sal.rest.impl;
  10
  11 import static org.opendaylight.netconf.sal.restconf.impl.PATCHEditOperation.isPatchOperationWithValue;
  12
  13 import com.google.common.collect.ImmutableList;
  14 import com.google.gson.stream.JsonReader;
  15 import com.google.gson.stream.JsonToken;
  16 import java.io.IOException;
  17 import java.io.InputStream;
  18 import java.io.InputStreamReader;
  19 import java.io.StringReader;
  20 import java.lang.annotation.Annotation;
  21 import java.lang.reflect.Type;
  22 import java.util.ArrayList;
  23 import java.util.List;
  24 import javax.annotation.Nonnull;
  25 import javax.ws.rs.Consumes;
  26 import javax.ws.rs.WebApplicationException;
  27 import javax.ws.rs.core.MediaType;
  28 import javax.ws.rs.core.MultivaluedMap;
  29 import javax.ws.rs.ext.MessageBodyReader;
  30 import javax.ws.rs.ext.Provider;
  31 import org.opendaylight.netconf.sal.rest.api.Draft02;
  32 import org.opendaylight.netconf.sal.rest.api.RestconfService;
  33 import org.opendaylight.netconf.sal.restconf.impl.ControllerContext;
  34 import org.opendaylight.netconf.sal.restconf.impl.InstanceIdentifierContext;
  35 import org.opendaylight.netconf.sal.restconf.impl.PATCHContext;
  36 import org.opendaylight.netconf.sal.restconf.impl.PATCHEntity;
  37 import org.opendaylight.netconf.sal.restconf.impl.RestconfDocumentedException;
  38 import org.opendaylight.netconf.sal.restconf.impl.RestconfError.ErrorTag;
  39 import org.opendaylight.netconf.sal.restconf.impl.RestconfError.ErrorType;
  40 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  41 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
  42 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  43 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  44 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
  45 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
  46 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
  47 import org.opendaylight.yangtools.yang.data.impl.schema.ResultAlreadySetException;
  48 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
  49 import org.opendaylight.yangtools.yang.model.util.SchemaContextUtil;
  50 import org.slf4j.Logger;
  51 import org.slf4j.LoggerFactory;
  52
  53 /**
  54  * @deprecated This class will be replaced by
  55  *             {@link org.opendaylight.restconf.jersey.providers.JsonToPATCHBodyReader}
  56  */
  57 @Deprecated
  58 @Provider
  59 @Consumes({Draft02.MediaTypes.PATCH + RestconfService.JSON})
  60 public class JsonToPATCHBodyReader extends AbstractIdentifierAwareJaxRsProvider
  61         implements MessageBodyReader<PATCHContext> {
  62
  63     private final static Logger LOG = LoggerFactory.getLogger(JsonToPATCHBodyReader.class);
  64     private String patchId;
  65
  66     @Override
  67     public boolean isReadable(final Class<?> type, final Type genericType,
  68                               final Annotation[] annotations, final MediaType mediaType) {
  69         return true;
  70     }
  71
  72     @Override
  73     public PATCHContext readFrom(final Class<PATCHContext> type, final Type genericType,
  74                                  final Annotation[] annotations, final MediaType mediaType,
  75                                  final MultivaluedMap<String, String> httpHeaders, final InputStream entityStream)
  76             throws IOException, WebApplicationException {
  77         try {
  78             return readFrom(getInstanceIdentifierContext(), entityStream);
  79         } catch (final Exception e) {
  80             throw propagateExceptionAs(e);
  81         }
  82     }
  83
  84     private static RuntimeException propagateExceptionAs(final Exception e) throws RestconfDocumentedException {
  85         if (e instanceof RestconfDocumentedException) {
  86             throw (RestconfDocumentedException)e;
  87         }
  88
  89         if (e instanceof ResultAlreadySetException) {
  90             LOG.debug("Error parsing json input:", e);
  91             throw new RestconfDocumentedException("Error parsing json input: Failed to create new parse result data. ");
  92         }
  93
  94         throw new RestconfDocumentedException("Error parsing json input: " + e.getMessage(), ErrorType.PROTOCOL,
  95                 ErrorTag.MALFORMED_MESSAGE, e);
  96     }
  97
  98     public PATCHContext readFrom(final String uriPath, final InputStream entityStream) throws
  99             RestconfDocumentedException {
 100         try {
 101             return readFrom(ControllerContext.getInstance().toInstanceIdentifier(uriPath), entityStream);
 102         } catch (final Exception e) {
 103             propagateExceptionAs(e);
 104             return null; // no-op
 105         }
 106     }
 107
 108     private PATCHContext readFrom(final InstanceIdentifierContext<?> path, final InputStream entityStream)
 109             throws IOException {
 110         if (entityStream.available() < 1) {
 111             return new PATCHContext(path, null, null);
 112         }
 113
 114         final JsonReader jsonReader = new JsonReader(new InputStreamReader(entityStream));
 115         final List<PATCHEntity> resultList = read(jsonReader, path);
 116         jsonReader.close();
 117
 118         return new PATCHContext(path, resultList, this.patchId);
 119     }
 120
 121     private List<PATCHEntity> read(final JsonReader in, final InstanceIdentifierContext path) throws IOException {
 122         final List<PATCHEntity> resultCollection = new ArrayList<>();
 123         final StringModuleInstanceIdentifierCodec codec = new StringModuleInstanceIdentifierCodec(
 124                 path.getSchemaContext());
 125         final JsonToPATCHBodyReader.PatchEdit edit = new JsonToPATCHBodyReader.PatchEdit();
 126
 127         while (in.hasNext()) {
 128             switch (in.peek()) {
 129                 case STRING:
 130                 case NUMBER:
 131                     in.nextString();
 132                     break;
 133                 case BOOLEAN:
 134                     Boolean.toString(in.nextBoolean());
 135                     break;
 136                 case NULL:
 137                     in.nextNull();
 138                     break;
 139                 case BEGIN_ARRAY:
 140                     in.beginArray();
 141                     break;
 142                 case BEGIN_OBJECT:
 143                     in.beginObject();
 144                     break;
 145                 case END_DOCUMENT:
 146                     break;
 147                 case NAME:
 148                     parseByName(in.nextName(), edit, in, path, codec, resultCollection);
 149                     break;
 150                 case END_OBJECT:
 151                     in.endObject();
 152                     break;
 153                 case END_ARRAY:
 154                     in.endArray();
 155                     break;
 156
 157                 default:
 158                     break;
 159             }
 160         }
 161
 162         return ImmutableList.copyOf(resultCollection);
 163     }
 164
 165     /**
 166      * Switch value of parsed JsonToken.NAME and read edit definition or patch id
 167      * @param name value of token
 168      * @param edit PatchEdit instance
 169      * @param in JsonReader reader
 170      * @param path InstanceIdentifierContext context
 171      * @param codec StringModuleInstanceIdentifierCodec codec
 172      * @param resultCollection collection of parsed edits
 173      * @throws IOException
 174      */
 175     private void parseByName(@Nonnull final String name, @Nonnull final PatchEdit edit,
 176                              @Nonnull final JsonReader in, @Nonnull final InstanceIdentifierContext path,
 177                              @Nonnull final StringModuleInstanceIdentifierCodec codec,
 178                              @Nonnull final List<PATCHEntity> resultCollection) throws IOException {
 179         switch (name) {
 180             case "edit" :
 181                 if (in.peek() == JsonToken.BEGIN_ARRAY) {
 182                     in.beginArray();
 183
 184                     while (in.hasNext()) {
 185                         readEditDefinition(edit, in, path, codec);
 186                         resultCollection.add(prepareEditOperation(edit));
 187                         edit.clear();
 188                     }
 189
 190                     in.endArray();
 191                 } else {
 192                     readEditDefinition(edit, in, path, codec);
 193                     resultCollection.add(prepareEditOperation(edit));
 194                     edit.clear();
 195                 }
 196
 197                 break;
 198             case "patch-id" :
 199                 this.patchId = in.nextString();
 200                 break;
 201             default:
 202                 break;
 203         }
 204     }
 205
 206     /**
 207      * Read one patch edit object from Json input
 208      * @param edit PatchEdit instance to be filled with read data
 209      * @param in JsonReader reader
 210      * @param path InstanceIdentifierContext path context
 211      * @param codec StringModuleInstanceIdentifierCodec codec
 212      * @throws IOException
 213      */
 214     private void readEditDefinition(@Nonnull final PatchEdit edit, @Nonnull final JsonReader in,
 215                                     @Nonnull final InstanceIdentifierContext path,
 216                                     @Nonnull final StringModuleInstanceIdentifierCodec codec) throws IOException {
 217         final StringBuffer value = new StringBuffer();
 218         in.beginObject();
 219
 220         while (in.hasNext()) {
 221             final String editDefinition = in.nextName();
 222             switch (editDefinition) {
 223                 case "edit-id" :
 224                     edit.setId(in.nextString());
 225                     break;
 226                 case "operation" :
 227                     edit.setOperation(in.nextString());
 228                     break;
 229                 case "target" :
 230                     // target can be specified completely in request URI
 231                     final String target = in.nextString();
 232                     if (target.equals("/")) {
 233                         edit.setTarget(path.getInstanceIdentifier());
 234                         edit.setTargetSchemaNode(path.getSchemaContext());
 235                     } else {
 236                         edit.setTarget(codec.deserialize(codec.serialize(path.getInstanceIdentifier()).concat(target)));
 237                         edit.setTargetSchemaNode(SchemaContextUtil.findDataSchemaNode(path.getSchemaContext(),
 238                                 codec.getDataContextTree().getChild(edit.getTarget()).getDataSchemaNode().getPath()
 239                                         .getParent()));
 240                     }
 241
 242                     break;
 243                 case "value" :
 244                     // save data defined in value node for next (later) processing, because target needs to be read
 245                     // always first and there is no ordering in Json input
 246                     readValueNode(value, in);
 247                     break;
 248                 default:
 249                     break;
 250             }
 251         }
 252
 253         in.endObject();
 254
 255         // read saved data to normalized node when target schema is already known
 256         edit.setData(readEditData(new JsonReader(new StringReader(value.toString())), edit.getTargetSchemaNode(), path));
 257     }
 258
 259     /**
 260      * Parse data defined in value node and saves it to buffer
 261      * @param value Buffer to read value node
 262      * @param in JsonReader reader
 263      * @throws IOException
 264      */
 265     private void readValueNode(@Nonnull final StringBuffer value, @Nonnull final JsonReader in) throws IOException {
 266         in.beginObject();
 267         value.append("{");
 268
 269         value.append("\"" + in.nextName() + "\"" + ":");
 270
 271         if (in.peek() == JsonToken.BEGIN_ARRAY) {
 272             in.beginArray();
 273             value.append("[");
 274
 275             while (in.hasNext()) {
 276                 if (in.peek() == JsonToken.STRING) {
 277                     value.append("\"" + in.nextString() + "\"");
 278                 } else {
 279                     readValueObject(value, in);
 280                 }
 281                 if (in.peek() != JsonToken.END_ARRAY) {
 282                     value.append(",");
 283                 }
 284             }
 285
 286             in.endArray();
 287             value.append("]");
 288         } else {
 289             readValueObject(value, in);
 290         }
 291
 292         in.endObject();
 293         value.append("}");
 294     }
 295
 296     /**
 297      * Parse one value object of data and saves it to buffer
 298      * @param value Buffer to read value object
 299      * @param in JsonReader reader
 300      * @throws IOException
 301      */
 302     private void readValueObject(@Nonnull final StringBuffer value, @Nonnull final JsonReader in) throws IOException {
 303         // read simple leaf value
 304         if (in.peek() == JsonToken.STRING) {
 305             value.append("\"" + in.nextString() + "\"");
 306             return;
 307         }
 308
 309         in.beginObject();
 310         value.append("{");
 311
 312         while (in.hasNext()) {
 313             value.append("\"" + in.nextName() + "\"");
 314             value.append(":");
 315
 316             if (in.peek() == JsonToken.STRING) {
 317                 value.append("\"" + in.nextString() + "\"");
 318             } else {
 319                 if (in.peek() == JsonToken.BEGIN_ARRAY) {
 320                     in.beginArray();
 321                     value.append("[");
 322
 323                     while (in.hasNext()) {
 324                         if (in.peek() == JsonToken.STRING) {
 325                             value.append("\"" + in.nextString() + "\"");
 326                         } else {
 327                             readValueObject(value, in);
 328                         }
 329                         if (in.peek() != JsonToken.END_ARRAY) {
 330                             value.append(",");
 331                         }
 332                     }
 333
 334                     in.endArray();
 335                     value.append("]");
 336                 } else {
 337                     readValueObject(value, in);
 338                 }
 339             }
 340
 341             if (in.peek() != JsonToken.END_OBJECT) {
 342                 value.append(",");
 343             }
 344         }
 345
 346         in.endObject();
 347         value.append("}");
 348     }
 349
 350     /**
 351      * Read patch edit data defined in value node to NormalizedNode
 352      * @param in reader JsonReader reader
 353      * @return NormalizedNode representing data
 354      */
 355     private static NormalizedNode readEditData(@Nonnull final JsonReader in, @Nonnull final SchemaNode targetSchemaNode,
 356                                         @Nonnull final InstanceIdentifierContext path) {
 357         final NormalizedNodeResult resultHolder = new NormalizedNodeResult();
 358         final NormalizedNodeStreamWriter writer = ImmutableNormalizedNodeStreamWriter.from(resultHolder);
 359         JsonParserStream.create(writer, path.getSchemaContext(), targetSchemaNode).parse(in);
 360
 361         return resultHolder.getResult();
 362     }
 363
 364     /**
 365      * Prepare PATCHEntity from PatchEdit instance when it satisfies conditions, otherwise throws exception
 366      * @param edit Instance of PatchEdit
 367      * @return PATCHEntity
 368      */
 369     private static PATCHEntity prepareEditOperation(@Nonnull final PatchEdit edit) {
 370         if ((edit.getOperation() != null) && (edit.getTargetSchemaNode() != null)
 371                 && checkDataPresence(edit.getOperation(), (edit.getData() != null))) {
 372             if (isPatchOperationWithValue(edit.getOperation())) {
 373                 // for lists allow to manipulate with list items through their parent
 374                 final YangInstanceIdentifier targetNode;
 375                 if (edit.getTarget().getLastPathArgument() instanceof NodeIdentifierWithPredicates) {
 376                     targetNode = edit.getTarget().getParent();
 377                 } else {
 378                     targetNode = edit.getTarget();
 379                 }
 380
 381                 return new PATCHEntity(edit.getId(), edit.getOperation(), targetNode, edit.getData());
 382             } else {
 383                 return new PATCHEntity(edit.getId(), edit.getOperation(), edit.getTarget());
 384             }
 385         }
 386
 387         throw new RestconfDocumentedException("Error parsing input", ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
 388     }
 389
 390     /**
 391      * Check if data is present when operation requires it and not present when operation data is not allowed
 392      * @param operation Name of operation
 393      * @param hasData Data in edit are present/not present
 394      * @return true if data is present when operation requires it or if there are no data when operation does not
 395      * allow it, false otherwise
 396      */
 397     private static boolean checkDataPresence(@Nonnull final String operation, final boolean hasData) {
 398         if (isPatchOperationWithValue(operation)) {
 399             return hasData;
 400         } else  {
 401             return !hasData;
 402         }
 403     }
 404
 405     /**
 406      * Helper class representing one patch edit
 407      */
 408     private static final class PatchEdit {
 409         private String id;
 410         private String operation;
 411         private YangInstanceIdentifier target;
 412         private SchemaNode targetSchemaNode;
 413         private NormalizedNode data;
 414
 415         public String getId() {
 416             return this.id;
 417         }
 418
 419         public void setId(final String id) {
 420             this.id = id;
 421         }
 422
 423         public String getOperation() {
 424             return this.operation;
 425         }
 426
 427         public void setOperation(final String operation) {
 428             this.operation = operation;
 429         }
 430
 431         public YangInstanceIdentifier getTarget() {
 432             return this.target;
 433         }
 434
 435         public void setTarget(final YangInstanceIdentifier target) {
 436             this.target = target;
 437         }
 438
 439         public SchemaNode getTargetSchemaNode() {
 440             return this.targetSchemaNode;
 441         }
 442
 443         public void setTargetSchemaNode(final SchemaNode targetSchemaNode) {
 444             this.targetSchemaNode = targetSchemaNode;
 445         }
 446
 447         public NormalizedNode getData() {
 448             return this.data;
 449         }
 450
 451         public void setData(final NormalizedNode data) {
 452             this.data = data;
 453         }
 454
 455         public void clear() {
 456             this.id = null;
 457             this.operation = null;
 458             this.target = null;
 459             this.targetSchemaNode = null;
 460             this.data = null;
 461         }
 462     }
 463 }