io.github.microcks.util.graphql.GraphQLHttpRequest Maven / Gradle / Ivy

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/*
 * Licensed to Laurent Broudoux (the "Author") under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Author licenses this
 * file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package io.github.microcks.util.graphql;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import javax.servlet.http.HttpServletRequest;

/**
 * A wrapper for parsing GraphQL requests over Http.
 * @author laurent
 */
public class GraphQLHttpRequest {

   String query;
   String operationName;
   JsonNode variables;

   public String getQuery() {
      return query;
   }

   public String getOperationName() {
      return operationName;
   }

   public JsonNode getVariables() {
      return variables;
   }

   /**
    * Build a GraphQLHttpRequest from Http servlet request and body content.
    * @param body The content of Http request.
    * @param request The servlet request
    * @return The wrapper object
    * @throws Exception if request is no valid Json as expected by GraphQL over Http spec.
    */
   public static GraphQLHttpRequest from(String body, HttpServletRequest request) throws Exception {
      // We'll need a Json mapper.
      ObjectMapper mapper = new ObjectMapper();
      GraphQLHttpRequest parameters = new GraphQLHttpRequest();

      if ("POST".equalsIgnoreCase(request.getMethod())) {
         // If it's a post, everything is in body.
         JsonNode json = mapper.readTree(body);
         parameters.query = json.path("query").asText();
         parameters.operationName = json.path("operationName").asText(null);
         parameters.variables = json.get("variables");
      } else {
         // If it's a get, we're using parameters.
         parameters.query = request.getParameter("query");
         parameters.operationName = request.getParameter("operationName");
         parameters.variables = getVariables(mapper, request.getParameter("variables"));
      }
      return parameters;
   }

   private static JsonNode getVariables(ObjectMapper mapper, String variables) throws Exception {
      if (variables != null) {
         return mapper.readTree(variables);
      }
      return null;
   }
}