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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, software<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> */<a name="line.17"></a> |
| <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.security.visibility;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import java.util.List;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span><a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.security.visibility.expression.ExpressionNode;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.security.visibility.expression.LeafExpressionNode;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.security.visibility.expression.NonLeafExpressionNode;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.security.visibility.expression.Operator;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span><a name="line.27"></a> |
| <span class="sourceLineNo">028</span>@InterfaceAudience.Private<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>public class ExpressionExpander {<a name="line.29"></a> |
| <span class="sourceLineNo">030</span><a name="line.30"></a> |
| <span class="sourceLineNo">031</span> public ExpressionNode expand(ExpressionNode src) {<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> if (!src.isSingleNode()) {<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> NonLeafExpressionNode nlExp = (NonLeafExpressionNode) src;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> List<ExpressionNode> childExps = nlExp.getChildExps();<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> Operator outerOp = nlExp.getOperator();<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> if (isToBeExpanded(childExps)) {<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> // Any of the child exp is a non leaf exp with & or | operator<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> NonLeafExpressionNode newNode = new NonLeafExpressionNode(nlExp.getOperator());<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> for (ExpressionNode exp : childExps) {<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> if (exp.isSingleNode()) {<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> newNode.addChildExp(exp);<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> } else {<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> newNode.addChildExp(expand(exp));<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> }<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> }<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> nlExp = expandNonLeaf(newNode, outerOp);<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> }<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> return nlExp;<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> }<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> if (src instanceof NonLeafExpressionNode<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> && ((NonLeafExpressionNode) src).getOperator() == Operator.NOT) {<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> // Negate the exp<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> return negate((NonLeafExpressionNode) src);<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> }<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> return src;<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> private ExpressionNode negate(NonLeafExpressionNode nlExp) {<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> ExpressionNode notChild = nlExp.getChildExps().get(0);<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> if (notChild instanceof LeafExpressionNode) {<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> return nlExp;<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> }<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> NonLeafExpressionNode nlNotChild = (NonLeafExpressionNode) notChild;<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> if (nlNotChild.getOperator() == Operator.NOT) {<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> // negate the negate<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> return nlNotChild.getChildExps().get(0);<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> }<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> Operator negateOp = nlNotChild.getOperator() == Operator.AND ? Operator.OR : Operator.AND;<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> NonLeafExpressionNode newNode = new NonLeafExpressionNode(negateOp);<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> for (ExpressionNode expNode : nlNotChild.getChildExps()) {<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> NonLeafExpressionNode negateNode = new NonLeafExpressionNode(Operator.NOT);<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> negateNode.addChildExp(expNode.deepClone());<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> newNode.addChildExp(expand(negateNode));<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> }<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> return newNode;<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> }<a name="line.76"></a> |
| <span class="sourceLineNo">077</span><a name="line.77"></a> |
| <span class="sourceLineNo">078</span> private boolean isToBeExpanded(List<ExpressionNode> childExps) {<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> for (ExpressionNode exp : childExps) {<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> if (!exp.isSingleNode()) {<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> return true;<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> }<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> }<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> return false;<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 NonLeafExpressionNode expandNonLeaf(NonLeafExpressionNode newNode, Operator outerOp) {<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> // Now go for the merge or expansion across brackets<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> List<ExpressionNode> newChildExps = newNode.getChildExps();<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> assert newChildExps.size() == 2;<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> ExpressionNode leftChild = newChildExps.get(0);<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> ExpressionNode rightChild = newChildExps.get(1);<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> if (rightChild.isSingleNode()) {<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> // Merge the single right node into the left side<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> assert leftChild instanceof NonLeafExpressionNode;<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> newNode = mergeChildNodes(newNode, outerOp, rightChild, (NonLeafExpressionNode) leftChild);<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> } else if (leftChild.isSingleNode()) {<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> // Merge the single left node into the right side<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> assert rightChild instanceof NonLeafExpressionNode;<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> newNode = mergeChildNodes(newNode, outerOp, leftChild, (NonLeafExpressionNode) rightChild);<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> } else {<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> // Both the child exp nodes are non single.<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> NonLeafExpressionNode leftChildNLE = (NonLeafExpressionNode) leftChild;<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> NonLeafExpressionNode rightChildNLE = (NonLeafExpressionNode) rightChild;<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> if (outerOp == leftChildNLE.getOperator() && outerOp == rightChildNLE.getOperator()) {<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> // Merge<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> NonLeafExpressionNode leftChildNLEClone = leftChildNLE.deepClone();<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> leftChildNLEClone.addChildExps(rightChildNLE.getChildExps());<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> newNode = leftChildNLEClone;<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> } else {<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> // (a | b) & (c & d) ...<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> if (outerOp == Operator.OR) {<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> // (a | b) | (c & d)<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> if (leftChildNLE.getOperator() == Operator.OR<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> && rightChildNLE.getOperator() == Operator.AND) {<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> leftChildNLE.addChildExp(rightChildNLE);<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> newNode = leftChildNLE;<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> } else if (leftChildNLE.getOperator() == Operator.AND<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> && rightChildNLE.getOperator() == Operator.OR) {<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> // (a & b) | (c | d)<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> rightChildNLE.addChildExp(leftChildNLE);<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> newNode = rightChildNLE;<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> }<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> // (a & b) | (c & d)<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> // This case no need to do any thing<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> } else {<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> // outer op is &<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> // (a | b) & (c & d) => (a & c & d) | (b & c & d)<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> if (leftChildNLE.getOperator() == Operator.OR<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> && rightChildNLE.getOperator() == Operator.AND) {<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> newNode = new NonLeafExpressionNode(Operator.OR);<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> for (ExpressionNode exp : leftChildNLE.getChildExps()) {<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> NonLeafExpressionNode rightChildNLEClone = rightChildNLE.deepClone();<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> rightChildNLEClone.addChildExp(exp);<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> newNode.addChildExp(rightChildNLEClone);<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> }<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> } else if (leftChildNLE.getOperator() == Operator.AND<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> && rightChildNLE.getOperator() == Operator.OR) {<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> // (a & b) & (c | d) => (a & b & c) | (a & b & d)<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> newNode = new NonLeafExpressionNode(Operator.OR);<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> for (ExpressionNode exp : rightChildNLE.getChildExps()) {<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> NonLeafExpressionNode leftChildNLEClone = leftChildNLE.deepClone();<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> leftChildNLEClone.addChildExp(exp);<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> newNode.addChildExp(leftChildNLEClone);<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> }<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> } else {<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> // (a | b) & (c | d) => (a & c) | (a & d) | (b & c) | (b & d)<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> newNode = new NonLeafExpressionNode(Operator.OR);<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> for (ExpressionNode leftExp : leftChildNLE.getChildExps()) {<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> for (ExpressionNode rightExp : rightChildNLE.getChildExps()) {<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> NonLeafExpressionNode newChild = new NonLeafExpressionNode(Operator.AND);<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> newChild.addChildExp(leftExp.deepClone());<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> newChild.addChildExp(rightExp.deepClone());<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> newNode.addChildExp(newChild);<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> }<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> }<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> }<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> }<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> }<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> }<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> return newNode;<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> }<a name="line.162"></a> |
| <span class="sourceLineNo">163</span><a name="line.163"></a> |
| <span class="sourceLineNo">164</span> private NonLeafExpressionNode mergeChildNodes(NonLeafExpressionNode newOuterNode,<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> Operator outerOp, ExpressionNode lChild, NonLeafExpressionNode nlChild) {<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> // Merge the single right/left node into the other side<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> if (nlChild.getOperator() == outerOp) {<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> NonLeafExpressionNode leftChildNLEClone = nlChild.deepClone();<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> leftChildNLEClone.addChildExp(lChild);<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> newOuterNode = leftChildNLEClone;<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> } else if (outerOp == Operator.AND) {<a name="line.171"></a> |
| <span class="sourceLineNo">172</span> assert nlChild.getOperator() == Operator.OR;<a name="line.172"></a> |
| <span class="sourceLineNo">173</span> // outerOp is & here. We need to expand the node here<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> // (a | b) & c -> (a & c) | (b & c)<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> // OR<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> // c & (a | b) -> (c & a) | (c & b)<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> newOuterNode = new NonLeafExpressionNode(Operator.OR);<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> for (ExpressionNode exp : nlChild.getChildExps()) {<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> newOuterNode.addChildExp(new NonLeafExpressionNode(Operator.AND, exp, lChild));<a name="line.179"></a> |
| <span class="sourceLineNo">180</span> }<a name="line.180"></a> |
| <span class="sourceLineNo">181</span> }<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> return newOuterNode;<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> }<a name="line.183"></a> |
| <span class="sourceLineNo">184</span>}<a name="line.184"></a> |
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