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POGroovy/Grails: is there a way to make .evaluate() at all safe?
 

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  1. POGroovy/Grails: is there a way to make .evaluate() at all safe?
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    <p>I have a situation where I need to determine eligiblity for for one object to "ride" another. The rules for the vehicles are wildly confusing, and I would like to be able to change them without restarting or recompiling my project.</p> <p>This works but basically makes my security friends convulse and speak in tongues:</p> <pre><code>class SweetRider{ String stuff BigDecimal someNumber BigDecimal anotherNumber } class SweetVehicle{ static hasMany=[constraintLinkers:VehicleConstraintLinker] String vehicleName Boolean canIRideIt(SweetRider checkRider){ def checkList = VehicleConstraintLinker.findAllByVehicle(this) checkList.each{ def theClosureObject = it.closureConstraint def iThinkINeedAShell = new GroovyShell() def checkerThing = iThinkINeedAShell.evaluate(theClosureObject.closureText) def result = checkerThing(checkRider) return result } } } class VehicleConstraintLinker{ static belongsTo = [closureConstraint:ConstraintByClosure, vehicle:SweetVehicle] } class ConstraintByClosure{ String humanReadable String closureText static hasMany = [vehicleLinkers:VehicleConstraintLinker] } </code></pre> <p>So if I want to add the rule that you are only eligible for a certain vehicle if your "stuff" is "peggy" or "waffles" and your someNumber is greater than your anotherNumber all I have to do is this:</p> <p>Make a new ConstraintByClosure with humanReadable = "peggy waffle some#>" (thats the human readable explanation) and then add this string as the closureText</p> <pre><code>{ checkRider-&gt;if( ["peggy","waffles"].contains(checkRider.stuff) &amp;&amp; checkRider.someNumber &gt; checkRider.anotherNumber ) { return true } else { return false } } </code></pre> <p>Then I just make a VehicleConstraintLinker to link it up and voila.</p> <p>My question is this: Is there any way to restrict what the GroovyShell can do? Can I make it unable to change any files, globals or database data? Is this sufficient?</p>
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    1. COPossibly related Q: http://stackoverflow.com/q/6488368/6509
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