aboutsummaryrefslogtreecommitdiffstats
path: root/Subscriber/src/SubscriberServlet.java
blob: 1af62a631ecfebc123c0ea5f8ca3b3eee2f5d7da (plain)
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
/*******************************************************************************
 * ============LICENSE_START==================================================
 * * org.onap.dmaap
 * * ===========================================================================
 * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
 * * ===========================================================================
 * * 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
 * * 
 *  *      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.
 * * ============LICENSE_END====================================================
 * *
 * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
 * *
 ******************************************************************************/

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.codec.binary.Base64;
import org.apache.log4j.Logger;

/**
 *	Example stand alone subscriber servlet with Authorization header checking
 */
public class SubscriberServlet extends HttpServlet	{
	private static Logger logger = Logger.getLogger("com.att.datarouter.pubsub.ssasubscribe.SubscriberServlet");
	private String Login = "LOGIN";
	private String Password = "PASSWORD";
	private String OutputDirectory = "/root/sub/received";

	private String auth;

	private static String gp(ServletConfig config, String param, String deflt) {
		param = config.getInitParameter(param);
		if (param == null || param.length() == 0) {
			param = deflt;
		}
		return(param);
	}
	/**
	 *	Configure this subscriberservlet.  Configuration parameters from config.getInitParameter() are:
	 *	<ul>
	 *	<li>Login - The login expected in the Authorization header (default "LOGIN").
	 *	<li>Password - The password expected in the Authorization header (default "PASSWORD").
	 *	<li>OutputDirectory - The directory where files are placed (default "received").
	 *	</ul>
	 */
	public void init(ServletConfig config) throws ServletException {
		Login = gp(config, "Login", Login);
		Password = gp(config, "Password", Password);
		OutputDirectory = gp(config, "OutputDirectory", OutputDirectory);
		(new File(OutputDirectory)).mkdirs();
		auth = "Basic " + Base64.encodeBase64String((Login + ":" + Password).getBytes());
	}
	/**
	 *	Invoke common(req, resp, false).
	 */
	protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		common(req, resp, false);
	}
	/**
	 *	Invoke common(req, resp, true).
	 */
	protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		common(req, resp, true);
	}
	/**
	 *	Process a PUT or DELETE request.
	 *	<ol>
	 *	<li>Verify that the request contains an Authorization header
	 *	or else UNAUTHORIZED.
	 *	<li>Verify that the Authorization header matches the configured
	 *	Login and Password or else FORBIDDEN.
	 *	<li>If the request is PUT, store the message body as a file
	 *	in the configured OutputDirectory directory protecting against
	 *	evil characters in the received FileID.  The file is created
	 *	initially with its name prefixed with a ".", and once it is complete, it is
	 *	renamed to remove the leading "." character.
	 *	<li>If the request is DELETE, instead delete the file (if it exists) from the configured OutputDirectory directory.
	 *	<li>Respond with NO_CONTENT.
	 *	</ol>
	 */
	protected void common(HttpServletRequest req, HttpServletResponse resp, boolean isdelete) throws ServletException, IOException {
		String ah = req.getHeader("Authorization");
		if (ah == null) {
			logger.info("Rejecting request with no Authorization header from " + req.getRemoteAddr() + ": " + req.getPathInfo());
			resp.sendError(HttpServletResponse.SC_UNAUTHORIZED);
			return;
		}
		if (!auth.equals(ah)) {
			logger.info("Rejecting request with incorrect Authorization header from " + req.getRemoteAddr() + ": " + req.getPathInfo());
			resp.sendError(HttpServletResponse.SC_FORBIDDEN);
			return;
		}
		String fileid = req.getPathInfo();
		fileid = fileid.substring(fileid.lastIndexOf('/') + 1);
		String qs = req.getQueryString();
		if (qs != null) {
			fileid = fileid + "?" + qs;
		}
		String publishid = req.getHeader("X-ATT-DR-PUBLISH-ID");
		String filename = URLEncoder.encode(fileid, "UTF-8").replaceAll("^\\.", "%2E").replaceAll("\\*", "%2A");
		String finalname = OutputDirectory + "/" + filename;
		String tmpname = OutputDirectory + "/." + filename;
		try {
			if (isdelete) {
				(new File(finalname)).delete();
				logger.info("Received delete for file id " + fileid + " from " + req.getRemoteAddr() + " publish id " + publishid + " as " + finalname);
			} else {
				InputStream is = req.getInputStream();
				OutputStream os = new FileOutputStream(tmpname);
				byte[] buf = new byte[65536];
				int i;
				while ((i = is.read(buf)) > 0) {
					os.write(buf, 0, i);
				}
				is.close();
				os.close();
				(new File(tmpname)).renameTo(new File(finalname));
				logger.info("Received file id " + fileid + " from " + req.getRemoteAddr() + " publish id " + publishid + " as " + finalname);
				resp.setStatus(HttpServletResponse.SC_NO_CONTENT);
				logger.info("Received file id " + fileid + " from " + req.getRemoteAddr() + " publish id " + publishid + " as " + finalname);
			}
			resp.setStatus(HttpServletResponse.SC_NO_CONTENT);
		} catch (IOException ioe) {
			(new File(tmpname)).delete();
			logger.info("Failure to save file " + finalname + " from " + req.getRemoteAddr() + ": " + req.getPathInfo(), ioe);
			throw ioe;
		}
	}
}