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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a>
<span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a>
<span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing,<a name="line.12"></a>
<span class="sourceLineNo">013</span> * software distributed under the License is distributed on an<a name="line.13"></a>
<span class="sourceLineNo">014</span> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY<a name="line.14"></a>
<span class="sourceLineNo">015</span> * KIND, either express or implied. See the License for the<a name="line.15"></a>
<span class="sourceLineNo">016</span> * specific language governing permissions and limitations<a name="line.16"></a>
<span class="sourceLineNo">017</span> * under the License.<a name="line.17"></a>
<span class="sourceLineNo">018</span> *<a name="line.18"></a>
<span class="sourceLineNo">019</span> */<a name="line.19"></a>
<span class="sourceLineNo">020</span>package org.apache.mina.example.tapedeck;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import static org.apache.mina.statemachine.event.IoFilterEvents.*;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.apache.mina.core.filterchain.IoFilter.NextFilter;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.mina.core.future.IoFutureListener;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.mina.core.session.IoSession;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.mina.core.write.WriteRequest;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.mina.example.tapedeck.TapeDeckServer.TapeDeckContext;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.apache.mina.statemachine.StateControl;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.apache.mina.statemachine.annotation.IoFilterTransition;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.apache.mina.statemachine.annotation.State;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.apache.mina.statemachine.context.AbstractStateContext;<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>/**<a name="line.34"></a>
<span class="sourceLineNo">035</span> * TODO Add documentation<a name="line.35"></a>
<span class="sourceLineNo">036</span> * <a name="line.36"></a>
<span class="sourceLineNo">037</span> * @author &lt;a href="http://mina.apache.org"&gt;Apache MINA Project&lt;/a&gt;<a name="line.37"></a>
<span class="sourceLineNo">038</span> */<a name="line.38"></a>
<span class="sourceLineNo">039</span>public class AuthenticationHandler {<a name="line.39"></a>
<span class="sourceLineNo">040</span> @State public static final String ROOT = "Root";<a name="line.40"></a>
<span class="sourceLineNo">041</span> @State(ROOT) public static final String START = "Start";<a name="line.41"></a>
<span class="sourceLineNo">042</span> @State(ROOT) public static final String WAIT_USER = "WaitUser";<a name="line.42"></a>
<span class="sourceLineNo">043</span> @State(ROOT) public static final String WAIT_PASSWORD = "WaitPassword";<a name="line.43"></a>
<span class="sourceLineNo">044</span> @State(ROOT) public static final String DONE = "Done";<a name="line.44"></a>
<span class="sourceLineNo">045</span> @State(ROOT) public static final String FAILED = "Failed";<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span> static class AuthenticationContext extends AbstractStateContext {<a name="line.47"></a>
<span class="sourceLineNo">048</span> private String user;<a name="line.48"></a>
<span class="sourceLineNo">049</span> private String password;<a name="line.49"></a>
<span class="sourceLineNo">050</span> private int tries = 0;<a name="line.50"></a>
<span class="sourceLineNo">051</span> }<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span> @IoFilterTransition(on = SESSION_OPENED, in = START, next = WAIT_USER)<a name="line.53"></a>
<span class="sourceLineNo">054</span> public void sendAuthRequest(NextFilter nextFilter, IoSession session) {<a name="line.54"></a>
<span class="sourceLineNo">055</span> session.write("+ Greetings from your tape deck!. Please authenticate yourself.");<a name="line.55"></a>
<span class="sourceLineNo">056</span> }<a name="line.56"></a>
<span class="sourceLineNo">057</span> <a name="line.57"></a>
<span class="sourceLineNo">058</span> @IoFilterTransition(on = MESSAGE_RECEIVED, in = WAIT_USER, next = WAIT_PASSWORD)<a name="line.58"></a>
<span class="sourceLineNo">059</span> public void user(AuthenticationContext context, NextFilter nextFilter, IoSession session, UserCommand cmd) {<a name="line.59"></a>
<span class="sourceLineNo">060</span> context.user = cmd.getUsername();<a name="line.60"></a>
<span class="sourceLineNo">061</span> session.write("+ Give me your password (hint: try your username backwards)");<a name="line.61"></a>
<span class="sourceLineNo">062</span> }<a name="line.62"></a>
<span class="sourceLineNo">063</span> <a name="line.63"></a>
<span class="sourceLineNo">064</span> @IoFilterTransition(on = MESSAGE_RECEIVED, in = WAIT_PASSWORD, next = DONE)<a name="line.64"></a>
<span class="sourceLineNo">065</span> public void password(AuthenticationContext context, NextFilter nextFilter, IoSession session, PasswordCommand cmd) {<a name="line.65"></a>
<span class="sourceLineNo">066</span> context.password = cmd.getPassword();<a name="line.66"></a>
<span class="sourceLineNo">067</span> if (context.password.equals(reverse(context.user))) {<a name="line.67"></a>
<span class="sourceLineNo">068</span> session.write("+ Authentication succeeded! Your tape deck has been unlocked.");<a name="line.68"></a>
<span class="sourceLineNo">069</span> } else {<a name="line.69"></a>
<span class="sourceLineNo">070</span> context.tries++;<a name="line.70"></a>
<span class="sourceLineNo">071</span> if (context.tries &lt; 3) {<a name="line.71"></a>
<span class="sourceLineNo">072</span> session.write("- Authentication failed! Please try again.");<a name="line.72"></a>
<span class="sourceLineNo">073</span> StateControl.breakAndGotoNext(WAIT_USER);<a name="line.73"></a>
<span class="sourceLineNo">074</span> } else {<a name="line.74"></a>
<span class="sourceLineNo">075</span> session.write("- Authentication failed too many times! Bye bye.").addListener(IoFutureListener.CLOSE);<a name="line.75"></a>
<span class="sourceLineNo">076</span> StateControl.breakAndGotoNext(FAILED);<a name="line.76"></a>
<span class="sourceLineNo">077</span> }<a name="line.77"></a>
<span class="sourceLineNo">078</span> }<a name="line.78"></a>
<span class="sourceLineNo">079</span> }<a name="line.79"></a>
<span class="sourceLineNo">080</span> <a name="line.80"></a>
<span class="sourceLineNo">081</span> <a name="line.81"></a>
<span class="sourceLineNo">082</span> @IoFilterTransition(on = MESSAGE_RECEIVED, in = ROOT)<a name="line.82"></a>
<span class="sourceLineNo">083</span> public void quit(TapeDeckContext context, IoSession session, QuitCommand cmd) {<a name="line.83"></a>
<span class="sourceLineNo">084</span> session.write("+ Bye! Please come back!").addListener(IoFutureListener.CLOSE);<a name="line.84"></a>
<span class="sourceLineNo">085</span> }<a name="line.85"></a>
<span class="sourceLineNo">086</span> <a name="line.86"></a>
<span class="sourceLineNo">087</span> private String reverse(String s) {<a name="line.87"></a>
<span class="sourceLineNo">088</span> char[] expectedPassword = new char[s.length()];<a name="line.88"></a>
<span class="sourceLineNo">089</span> for (int i = 0; i &lt; expectedPassword.length; i++) {<a name="line.89"></a>
<span class="sourceLineNo">090</span> expectedPassword[i] = s.charAt(s.length() - i - 1);<a name="line.90"></a>
<span class="sourceLineNo">091</span> }<a name="line.91"></a>
<span class="sourceLineNo">092</span> return new String(expectedPassword);<a name="line.92"></a>
<span class="sourceLineNo">093</span> }<a name="line.93"></a>
<span class="sourceLineNo">094</span> <a name="line.94"></a>
<span class="sourceLineNo">095</span> @IoFilterTransition(on = MESSAGE_RECEIVED, in = WAIT_USER, weight = 10)<a name="line.95"></a>
<span class="sourceLineNo">096</span> public void errorWaitingForUser(IoSession session, Command cmd) {<a name="line.96"></a>
<span class="sourceLineNo">097</span> if (cmd instanceof QuitCommand) {<a name="line.97"></a>
<span class="sourceLineNo">098</span> StateControl.breakAndContinue();<a name="line.98"></a>
<span class="sourceLineNo">099</span> }<a name="line.99"></a>
<span class="sourceLineNo">100</span> session.write("Unexpected command '" + cmd.getName() + "'. Expected 'user &lt;username&gt;'.");<a name="line.100"></a>
<span class="sourceLineNo">101</span> }<a name="line.101"></a>
<span class="sourceLineNo">102</span> <a name="line.102"></a>
<span class="sourceLineNo">103</span> @IoFilterTransition(on = MESSAGE_RECEIVED, in = WAIT_PASSWORD, weight = 10)<a name="line.103"></a>
<span class="sourceLineNo">104</span> public void errorWaitingForPassword(IoSession session, Command cmd) {<a name="line.104"></a>
<span class="sourceLineNo">105</span> if (cmd instanceof QuitCommand) {<a name="line.105"></a>
<span class="sourceLineNo">106</span> StateControl.breakAndContinue();<a name="line.106"></a>
<span class="sourceLineNo">107</span> }<a name="line.107"></a>
<span class="sourceLineNo">108</span> session.write("Unexpected command '" + cmd.getName() + "'. Expected 'password &lt;password&gt;'.");<a name="line.108"></a>
<span class="sourceLineNo">109</span> }<a name="line.109"></a>
<span class="sourceLineNo">110</span> <a name="line.110"></a>
<span class="sourceLineNo">111</span> @IoFilterTransition(on = EXCEPTION_CAUGHT, in = ROOT)<a name="line.111"></a>
<span class="sourceLineNo">112</span> public void commandSyntaxError(IoSession session, CommandSyntaxException e) {<a name="line.112"></a>
<span class="sourceLineNo">113</span> session.write("- " + e.getMessage());<a name="line.113"></a>
<span class="sourceLineNo">114</span> }<a name="line.114"></a>
<span class="sourceLineNo">115</span> <a name="line.115"></a>
<span class="sourceLineNo">116</span> @IoFilterTransition(on = EXCEPTION_CAUGHT, in = ROOT, weight = 10)<a name="line.116"></a>
<span class="sourceLineNo">117</span> public void exceptionCaught(IoSession session, Exception e) {<a name="line.117"></a>
<span class="sourceLineNo">118</span> e.printStackTrace();<a name="line.118"></a>
<span class="sourceLineNo">119</span> session.close(true);<a name="line.119"></a>
<span class="sourceLineNo">120</span> }<a name="line.120"></a>
<span class="sourceLineNo">121</span> <a name="line.121"></a>
<span class="sourceLineNo">122</span> @IoFilterTransition(on = SESSION_CLOSED, in = DONE)<a name="line.122"></a>
<span class="sourceLineNo">123</span> public void sessionClosed(NextFilter nextFilter, IoSession session) {<a name="line.123"></a>
<span class="sourceLineNo">124</span> nextFilter.sessionClosed(session);<a name="line.124"></a>
<span class="sourceLineNo">125</span> }<a name="line.125"></a>
<span class="sourceLineNo">126</span> @IoFilterTransition(on = EXCEPTION_CAUGHT, in = DONE)<a name="line.126"></a>
<span class="sourceLineNo">127</span> public void exceptionCaught(NextFilter nextFilter, IoSession session, Throwable cause) {<a name="line.127"></a>
<span class="sourceLineNo">128</span> nextFilter.exceptionCaught(session, cause);<a name="line.128"></a>
<span class="sourceLineNo">129</span> }<a name="line.129"></a>
<span class="sourceLineNo">130</span> @IoFilterTransition(on = MESSAGE_RECEIVED, in = DONE)<a name="line.130"></a>
<span class="sourceLineNo">131</span> public void messageReceived(NextFilter nextFilter, IoSession session, Object message) {<a name="line.131"></a>
<span class="sourceLineNo">132</span> nextFilter.messageReceived(session, message);<a name="line.132"></a>
<span class="sourceLineNo">133</span> }<a name="line.133"></a>
<span class="sourceLineNo">134</span> @IoFilterTransition(on = MESSAGE_SENT, in = DONE)<a name="line.134"></a>
<span class="sourceLineNo">135</span> public void messageSent(NextFilter nextFilter, IoSession session, WriteRequest writeRequest) {<a name="line.135"></a>
<span class="sourceLineNo">136</span> nextFilter.messageSent(session, writeRequest);<a name="line.136"></a>
<span class="sourceLineNo">137</span> }<a name="line.137"></a>
<span class="sourceLineNo">138</span> <a name="line.138"></a>
<span class="sourceLineNo">139</span> @IoFilterTransition(on = CLOSE, in = ROOT)<a name="line.139"></a>
<span class="sourceLineNo">140</span> public void filterClose(NextFilter nextFilter, IoSession session) {<a name="line.140"></a>
<span class="sourceLineNo">141</span> nextFilter.filterClose(session);<a name="line.141"></a>
<span class="sourceLineNo">142</span> }<a name="line.142"></a>
<span class="sourceLineNo">143</span> @IoFilterTransition(on = WRITE, in = ROOT)<a name="line.143"></a>
<span class="sourceLineNo">144</span> public void filterWrite(NextFilter nextFilter, IoSession session, WriteRequest writeRequest) {<a name="line.144"></a>
<span class="sourceLineNo">145</span> nextFilter.filterWrite(session, writeRequest);<a name="line.145"></a>
<span class="sourceLineNo">146</span> }<a name="line.146"></a>
<span class="sourceLineNo">147</span>}<a name="line.147"></a>
</pre>
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