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Java client for the RabbitMQ HTTP API
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/*
 * Copyright 2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.rabbitmq.http.client;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.rabbitmq.http.client.domain.CurrentUserDetails;
import com.rabbitmq.http.client.domain.UserInfo;
import com.rabbitmq.http.client.domain.VhostLimits;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

final class JsonUtils {

  static final JsonDeserializer VHOST_LIMITS_DESERIALIZER_INSTANCE =
      new VhostLimitsDeserializer();
  static final JsonDeserializer CURRENT_USER_DETAILS_DESERIALIZER_INSTANCE =
      new CurrentUserDetailsDeserializer();
  static final JsonDeserializer USER_INFO_DESERIALIZER_INSTANCE =
      new UserInfoDeserializer();

  private JsonUtils() {}

  private static String get(JsonNode jp, String name) {
    return jp.get(name).asText();
  }

  private static final class VhostLimitsDeserializer extends StdDeserializer {
    private static final String VHOST_FIELD = "vhost";
    private static final String VALUE_FIELD = "value";
    private static final String MAX_QUEUES_FIELD = "max-queues";
    private static final String MAX_CONNECTIONS_FIELD = "max-connections";
    private static final long serialVersionUID = -1881403692606830843L;

    private VhostLimitsDeserializer() {
      super(VhostLimits.class);
    }

    @Override
    public VhostLimits deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
      JsonNode node = jp.getCodec().readTree(jp);
      if (node.isArray()) {
        if (node.isEmpty()) {
          return new VhostLimits(null, -1, -1);
        }
        node = node.get(0);
      }
      JsonNode value = node.get(VALUE_FIELD);
      return new VhostLimits(
          get(node, VHOST_FIELD),
          getLimit(value, MAX_QUEUES_FIELD),
          getLimit(value, MAX_CONNECTIONS_FIELD));
    }

    private int getLimit(JsonNode value, String name) {
      JsonNode limit = value.get(name);
      if (limit == null) {
        return -1;
      } else {
        return limit.asInt(-1);
      }
    }
  }

  private abstract static class UserDeserializer extends StdDeserializer {

    private static final long serialVersionUID = 3473030985825959020L;
    protected static final String USERNAME_FIELD = "name";
    protected static final String TAGS_FIELD = "tags";

    protected UserDeserializer(Class vc) {
      super(vc);
    }

    protected String getUsername(JsonNode node) {
      return node.get(USERNAME_FIELD).asText();
    }

    protected List getTags(JsonNode parent) {
      JsonNode node = parent.get(TAGS_FIELD);

      List tags;
      if (node.isArray()) {
        if (node.isEmpty()) {
          tags = Collections.emptyList();
        } else {
          tags = new ArrayList<>(node.size());
          for (int i = 0; i < node.size(); i++) {
            tags.add(node.get(i).asText());
          }
        }
      } else {
        if (node.asText() == null || node.asText().isEmpty()) {
          tags = Collections.emptyList();
        } else {
          tags = Arrays.asList(node.asText().split(","));
        }
      }
      return tags;
    }
  }

  private static final class UserInfoDeserializer extends UserDeserializer {
    private static final long serialVersionUID = -1871403623406830843L;

    private static final String PASSWORD_HASH_FIELD = "password_hash";
    private static final String HASHING_ALGORITHM_FIELD = "hashing_algorithm";

    private UserInfoDeserializer() {
      super(UserInfo.class);
    }

    @Override
    public UserInfo deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
      JsonNode node = jp.getCodec().readTree(jp);

      return new UserInfo(
          getUsername(node),
          get(node, PASSWORD_HASH_FIELD),
          get(node, HASHING_ALGORITHM_FIELD),
          getTags(node));
    }
  }

  private static final class CurrentUserDetailsDeserializer
      extends UserDeserializer {
    private static final long serialVersionUID = -1871403623406830843L;

    private CurrentUserDetailsDeserializer() {
      super(UserInfo.class);
    }

    @Override
    public CurrentUserDetails deserialize(JsonParser jp, DeserializationContext ctxt)
        throws IOException {
      JsonNode node = jp.getCodec().readTree(jp);

      return new CurrentUserDetails(get(node, USERNAME_FIELD), getTags(node));
    }
  }
}