64 lines
1.7 KiB
Java
64 lines
1.7 KiB
Java
package net.filebot.format;
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import static net.filebot.format.ExpressionFormat.*;
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import java.security.AccessController;
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import javax.script.Bindings;
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import javax.script.CompiledScript;
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import javax.script.ScriptContext;
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import javax.script.ScriptException;
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import javax.script.SimpleScriptContext;
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import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
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public class ExpressionFilter {
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private final String expression;
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private final CompiledScript compiledExpression;
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private Throwable lastException;
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public ExpressionFilter(String expression) throws ScriptException {
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this.expression = expression;
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this.compiledExpression = new SecureCompiledScript(compileScriptlet(asExpression(expression)));
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}
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public String getExpression() {
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return expression;
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}
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public Throwable getLastException() {
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return lastException;
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}
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public boolean matches(Object value) {
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return matches(new ExpressionBindings(value));
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}
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public boolean matches(Bindings bindings) {
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this.lastException = null;
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// use privileged bindings so we are not restricted by the script sandbox
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Bindings priviledgedBindings = PrivilegedInvocation.newProxy(Bindings.class, bindings, AccessController.getContext());
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// initialize script context with the privileged bindings
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ScriptContext context = new SimpleScriptContext();
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context.setBindings(priviledgedBindings, ScriptContext.GLOBAL_SCOPE);
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try {
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// evaluate user script
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Object value = compiledExpression.eval(context);
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// value as boolean
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return DefaultTypeTransformation.castToBoolean(value);
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} catch (Throwable e) {
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// ignore any and all scripting exceptions
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this.lastException = e;
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}
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return false;
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}
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}
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