restconf/restconf-nb/src/main/java/org/opendaylight/restconf/nb/rfc8040/databind/JsonChildBody.java

   1 /*
   2  * Copyright (c) 2023 PANTHEON.tech, s.r.o. 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 package org.opendaylight.restconf.nb.rfc8040.databind;
   9
  10 import com.google.common.base.Throwables;
  11 import com.google.common.collect.ImmutableList;
  12 import com.google.gson.stream.JsonReader;
  13 import java.io.InputStream;
  14 import java.io.InputStreamReader;
  15 import java.nio.charset.StandardCharsets;
  16 import org.eclipse.jdt.annotation.NonNull;
  17 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  18 import org.opendaylight.restconf.server.api.DataPostPath;
  19 import org.opendaylight.yangtools.yang.common.ErrorTag;
  20 import org.opendaylight.yangtools.yang.common.ErrorType;
  21 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  22 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  23 import org.opendaylight.yangtools.yang.data.api.schema.ChoiceNode;
  24 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  25 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  26 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
  27 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
  28 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizationResultHolder;
  29 import org.opendaylight.yangtools.yang.data.impl.schema.ResultAlreadySetException;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32
  33 public final class JsonChildBody extends ChildBody {
  34     private static final Logger LOG = LoggerFactory.getLogger(JsonChildBody.class);
  35
  36     public JsonChildBody(final InputStream inputStream) {
  37         super(inputStream);
  38     }
  39
  40     @Override
  41     @SuppressWarnings("checkstyle:illegalCatch")
  42     PrefixAndBody toPayload(final DataPostPath path, final InputStream inputStream) {
  43         NormalizedNode result;
  44         try {
  45             result = toNormalizedNode(path, inputStream);
  46         } catch (Exception e) {
  47             Throwables.throwIfInstanceOf(e, RestconfDocumentedException.class);
  48             LOG.debug("Error parsing json input", e);
  49
  50             if (e instanceof ResultAlreadySetException) {
  51                 throw new RestconfDocumentedException(
  52                     "Error parsing json input: Failed to create new parse result data. "
  53                         + "Are you creating multiple resources/subresources in POST request?", e);
  54             }
  55
  56             throwIfYangError(e);
  57             throw new RestconfDocumentedException("Error parsing input: " + e.getMessage(), ErrorType.PROTOCOL,
  58                 ErrorTag.MALFORMED_MESSAGE, e);
  59         }
  60
  61         final var iiToDataList = ImmutableList.<PathArgument>builder();
  62         while (result instanceof ChoiceNode choice) {
  63             final var childNode = choice.body().iterator().next();
  64             iiToDataList.add(result.name());
  65             result = childNode;
  66         }
  67
  68         final var resultName = result.name();
  69         if (result instanceof MapEntryNode) {
  70             iiToDataList.add(new NodeIdentifier(resultName.getNodeType()));
  71         }
  72         iiToDataList.add(resultName);
  73
  74         return new PrefixAndBody(iiToDataList.build(), result);
  75     }
  76
  77     private static @NonNull NormalizedNode toNormalizedNode(final DataPostPath path, final InputStream inputStream) {
  78         final var resultHolder = new NormalizationResultHolder();
  79         final var writer = ImmutableNormalizedNodeStreamWriter.from(resultHolder);
  80         final var jsonParser = JsonParserStream.create(writer, path.databind().jsonCodecs(), path.inference());
  81         final var reader = new JsonReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
  82         jsonParser.parse(reader);
  83
  84         return resultHolder.getResult().data();
  85     }
  86 }