1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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 org.apache.tuscany.sca.binding.rest.wireformat.json.provider;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import org.apache.tuscany.sca.binding.rest.RESTBinding;
import org.apache.tuscany.sca.binding.rest.wireformat.json.JSONWireFormat;
import org.apache.tuscany.sca.common.http.HTTPContext;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Interceptor;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.RuntimeEndpoint;
import org.json.JSONObject;
/**
* JSON wire format Interceptor.
*
* @version $Rev$ $Date$
*/
public class JSONWireFormatInterceptor implements Interceptor {
private Invoker next;
private RESTBinding binding;
public JSONWireFormatInterceptor(ExtensionPointRegistry extensionPoints, RuntimeEndpoint endpoint) {
this.binding = (RESTBinding) endpoint.getBinding();
}
public Invoker getNext() {
return next;
}
public void setNext(Invoker next) {
this.next = next;
}
public Message invoke(Message msg) {
HTTPContext bindingContext = (HTTPContext) msg.getBindingContext();
if (bindingContext == null) {
return getNext().invoke(msg);
}
if (binding.getRequestWireFormat() instanceof JSONWireFormat) {
if( isPayloadSupported(bindingContext.getHttpRequest().getMethod()) && msg.getBody() != null) {
msg = invokeRequest(bindingContext, msg);
}
}
msg = getNext().invoke(msg);
//if it's oneway return back
Operation operation = msg.getOperation();
if (operation != null && operation.isNonBlocking()) {
return msg;
}
if (binding.getResponseWireFormat() instanceof JSONWireFormat) {
msg = invokeResponse(bindingContext, msg);
}
return msg;
}
/**
* Handle any wire format specific transformations required for request data
* @param bindingContext the binding context (e.g. HTTP Request, Response objects)
* @param msg the invocation message
* @return processed request message
*/
private Message invokeRequest(HTTPContext bindingContext, Message msg) {
// Decode using the charset in the request if it exists otherwise
// use UTF-8 as this is what all browser implementations use.
String charset = bindingContext.getHttpRequest().getCharacterEncoding();
if (charset == null) {
charset = "UTF-8";
}
try {
Object[] args = msg.getBody();
InputStream in = (InputStream) args[0];
String data = read(in, charset);
JSONObject jsonPayload = new JSONObject(data);
msg.setBody(new Object[]{jsonPayload});
} catch(Exception e) {
throw new RuntimeException("Unable to parse json paylod: " + msg.getBody().toString());
}
return msg;
}
/**
* Handle any wire format specific transformation required for the response data
* @param bindingContext the binding context (e.g. HTTP Request, Response objects)
* @param msg the response message
* @return processed response message
*/
private Message invokeResponse(HTTPContext bindingContext, Message msg) {
return msg;
}
/**
* Check if HTTP Operation should support payload
* @param operation
* @return
*/
private static boolean isPayloadSupported(String operation) {
boolean isGet = "get".equalsIgnoreCase(operation);
boolean isDelete = "delete".equalsIgnoreCase(operation);
return isGet == false && isDelete == false;
}
/**
* Read JSON payload from HTTP Request Body
* @param in
* @param charset
* @return
* @throws IOException
*/
private static String read(InputStream in, String charset) throws IOException {
StringWriter sw = new StringWriter();
InputStreamReader reader = new InputStreamReader(in, "UTF-8");
char[] buf = new char[8192];
while (true) {
int size = reader.read(buf);
if (size < 0) {
break;
}
sw.write(buf, 0, size);
}
return sw.toString();
}
}
|
