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Code Issues Releases Wiki Activity

* use proper Groovy DefaultTypeTransformation instead of hacky "value as boolean" script

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This commit is contained in:
Reinhard Pointner 2014-04-17 06:14:38 +00:00
parent ed9413afe7
commit 03ce43e6f9
1 changed files with 20 additions and 35 deletions
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55
source/net/sourceforge/filebot/format/ExpressionFilter.java
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@ -1,7 +1,5 @@
package net.sourceforge.filebot.format;
import java.security.AccessController;
import javax.script.Bindings;
@ -9,71 +7,58 @@ import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.ScriptContext;
import javax.script.ScriptException;
import javax.script.SimpleBindings;
import javax.script.SimpleScriptContext;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
public class ExpressionFilter {
private final String expression;
private final CompiledScript userScript;
private final CompiledScript asBooleanScript;
private final CompiledScript compiledExpression;
private Throwable lastException;
public ExpressionFilter(String expression) throws ScriptException {
this.expression = expression;
Compilable engine = (Compilable) ExpressionFormat.getGroovyScriptEngine();
this.userScript = new SecureCompiledScript(engine.compile(expression)); // sandboxed script
this.asBooleanScript = engine.compile("value as Boolean");
this.compiledExpression = new SecureCompiledScript(engine.compile(expression)); // sandboxed script
}
public String getExpression() {
return expression;
}
public Throwable getLastException() {
return lastException;
}
public boolean matches(Object value) throws ScriptException {
return matches(new ExpressionBindings(value));
}
public boolean matches(Bindings bindings) throws ScriptException {
this.lastException = null;
// use privileged bindings so we are not restricted by the script sandbox
Bindings priviledgedBindings = PrivilegedInvocation.newProxy(Bindings.class, bindings, AccessController.getContext());
// initialize script context with the privileged bindings
ScriptContext context = new SimpleScriptContext();
context.setBindings(priviledgedBindings, ScriptContext.GLOBAL_SCOPE);
try {
// evaluate user script
Object value = userScript.eval(context);
// convert value to boolean
Bindings valueBinding = new SimpleBindings();
valueBinding.put("value", value);
Object result = asBooleanScript.eval(valueBinding);
if (result instanceof Boolean) {
return (Boolean) result;
}
Object value = compiledExpression.eval(context);
// value as boolean
return DefaultTypeTransformation.castToBoolean(value);
} catch (Throwable e) {
// ignore any and all scripting exceptions
this.lastException = e;
}
return false;
}
}