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1   /*
2    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
3    * The software in this package is published under the terms of the CPAL v1.0
4    * license, a copy of which has been included with this distribution in the
5    * LICENSE.txt file.
6    */
7   package org.mule.transport.http.transformers;
8   
9   import org.mule.api.MuleMessage;
10  import org.mule.api.transformer.TransformerException;
11  import org.mule.transformer.AbstractMessageTransformer;
12  import org.mule.transformer.types.DataTypeFactory;
13  import org.mule.transport.http.HttpConstants;
14  import org.mule.util.StringUtils;
15  
16  import java.net.URI;
17  import java.util.Arrays;
18  import java.util.HashMap;
19  import java.util.List;
20  import java.util.Map;
21  
22  import org.apache.commons.codec.net.URLCodec;
23  
24  public class HttpRequestBodyToParamMap extends AbstractMessageTransformer
25  {
26      public HttpRequestBodyToParamMap()
27      {
28          registerSourceType(DataTypeFactory.OBJECT);
29          setReturnDataType(DataTypeFactory.OBJECT);
30      }
31  
32      @Override
33      public Object transformMessage(MuleMessage message, String outputEncoding) throws TransformerException
34      {
35          Map<String, Object> paramMap = new HashMap<String, Object>();
36  
37          try
38          {
39              String httpMethod = message.getInboundProperty("http.method");
40              String contentType = message.getInboundProperty("Content-Type");
41              
42              boolean isGet = HttpConstants.METHOD_GET.equalsIgnoreCase(httpMethod);
43              boolean isPost = HttpConstants.METHOD_POST.equalsIgnoreCase(httpMethod);
44              boolean isUrlEncoded = false;
45              if (contentType != null)
46              {
47                  isUrlEncoded = contentType.startsWith("application/x-www-form-urlencoded");
48              }
49  
50              if (!(isGet || (isPost && isUrlEncoded)))
51              {
52                  throw new Exception("The HTTP method or content type is unsupported!");
53              }
54  
55              String queryString = null;
56              if (isGet)
57              {
58                  URI uri = new URI(message.getPayloadAsString(outputEncoding));
59                  queryString = uri.getRawQuery();
60              }
61              else if (isPost)
62              {
63                  queryString = new String(message.getPayloadAsBytes());
64              }
65  
66              if (StringUtils.isNotBlank(queryString))
67              {
68                  addQueryStringToParameterMap(queryString, paramMap, outputEncoding);
69              }
70          }
71          catch (Exception e)
72          {
73              throw new TransformerException(this, e);
74          }
75  
76          return paramMap;
77      }
78  
79      protected void addQueryStringToParameterMap(String queryString, Map<String, Object> paramMap,
80          String outputEncoding) throws Exception
81      {
82          String[] pairs = queryString.split("&");
83          for (String pair : pairs)
84          {
85              String[] nameValue = pair.split("=");
86              if (nameValue.length == 2)
87              {
88                  URLCodec codec = new URLCodec(outputEncoding);
89                  String key = codec.decode(nameValue[0]);
90                  String value = codec.decode(nameValue[1]);
91                  addToParameterMap(paramMap, key, value);
92              }
93          }
94      }
95  
96      @SuppressWarnings("unchecked")
97      protected void addToParameterMap(Map<String, Object> paramMap, String key, String value)
98      {
99          Object existingValue = paramMap.get(key);
100         if (existingValue != null)
101         {
102             List<Object> values;
103             if (existingValue instanceof List<?>)
104             {
105                 values = (List<Object>) existingValue;
106             }
107             else
108             {
109                 values = Arrays.asList(existingValue);
110             }
111 
112             values.add(value);
113             paramMap.put(key, values);
114         }
115         else
116         {
117             paramMap.put(key, value);
118         }
119     }
120 
121     @Override
122     public boolean isAcceptNull()
123     {
124         return false;
125     }
126 }